sri lanka: power system reliability strengthening project
TRANSCRIPT
Initial Environmental Examination
July 2021
Sri Lanka: Power System Reliability Strengthening Project
Annex 7: Environmental Audit for Existing Substations
Prepared by Ceylon Electricity Board and Lanka Electricity Company (Private) Limited for the Asian Development Bank. This initial environmental examination is a document of the borrower. The views expressed herein do not necessarily represent those of ADB's Board of Directors, Management, or staff, and may be preliminary in nature. Your attention is directed to the “terms of use” section on ADB’s website. In preparing any country program or strategy, financing any project, or by making any designation of or reference to a particular territory or geographic area in this document, the Asian Development Bank does not intend to make any judgments as to the legal or other status of any territory or area.
Environmental Audit for Existing Substations
Document stage: Final Project Number: TA-9460 SRI July 2021
Power System Reliability Strengthening Project (PSRSP-TA 9460 SRI) Prepared by Resource Management Associates (Pvt) Ltd. for Asian Development Bank
I. INTRODUCTION
A. Background
1. The scope of the Power System Reliability Strengthening Project (PSRSP) includes
two 220 kV bay extensions in one existing grid substation (GSS), two 132 kV bay extensions
in three existing GSS, a new control building in the existing Matara GSS, and modification of
protection systems in eleven GSS/substations (SS). These components have to comply with
ADB’s Safeguards Policy Statement (2009) requirements and Sri Lankan environmental,
health and safety regulations. As per ADB’s Safeguards Policy Statement (2009), projects
involving facilities and/or business activities that already exist or are under construction, will
undertake an environment audit, including on-site assessment, to identify past or present
concerns related to impacts on the environment. The objective of the environment audit is to
determine whether actions were in accordance with ADB’s environment safeguard principles
and requirements and to identify and plan appropriate measures to address outstanding
compliance issues. Where noncompliance is identified, a corrective action plan (CAP) is
prepared. The CAP will define necessary corrective actions, the budget for such actions, and
the time frame for implementation. Since the project involves augmentation of existing
substations an environment compliance audit has been undertaken to support the IEE.
Expansion of existing facilities does not categorize as prescribed projects that require
environmental clearance under the National Environmental Act (NEA) No 47 of 1980 as
amended by Act No 56 of 1988 and Act No 53 of 2000.
B. Proposed Expansion Works
2. Line bays are required to connect transmission lines to GSS. One circuit of a
transmission line is connected to a line bay and, therefore, two bays are required to connect
a double circuit transmission line to a GSS. Table 1 summarizes the requirement of bay
extensions under the project.
Table 1: Requirement of Bay Extensions
Grid Substation
Number of Bays
Voltage Relevant Transmission Line Constructed under Project
New Anuradhapura
2 220 kV New Anuradhapura GSS - New Habarana SS 220 kV double circuit transmission line
Hambantota 2 132 kV Hambantota GSS - Matara GSS 132 kV double circuit transmission line
Kukule Ganga 2 132 kV Kukule Ganga PS - Kalawana GSS 132 kV double circuit transmission line
Matara 2 132 kV Hambantota GSS - Matara GSS 132 kV double circuit transmission line
3. Circuits of transmission lines are electrically protected from both terminals, using
switchgear which is controlled by protection relays. Switchgear and relays are located within
GSS. For a given circuit of a transmission line, protection relays at both terminals should be
operated in harmony to avoid any maloperations. Five Line-in Line-out (LILO) connections will
be constructed under the project. Construction of LILO connections alters the terminal points
of circuits of existing transmission lines which feed the LILO connection. Protection relays at
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existing terminals must be modified to match with protection relays at the new terminals. Thus,
new protection panels will be installed at eleven GSS/SS under the project.
C. Purpose of the Environmental Audit
4. Purpose of the environmental audit is:
(i) to identify any past and present inadequacies in environmental, occupational
and community health and safety management at the existing substations to
be augmented;
(ii) to determine the need for corrective actions necessary to bring the existing
facilities into compliance with Sri Lankan environmental, health and safety
regulations;1
(iii) to determine the need for corrective actions necessary to bring the existing
facilities into compliance with ADB’s Safeguards Policy Statement (2009) and
IFC EHS Guidelines which the ADB’s Safeguards Policy Statement (2009)
refers; and
(iv) to recommend actions to be taken to improve and strengthen CEB’s
environmental, health, and safety management.
D. Scope of Work
5. The environmental audit was focused on the 15 GSS/SS where there will be bay
extensions, a new control building and new protection panels installed as detailed above.
These 15 GSS/SS (Table 2) are New Anuradhapura GSS, Hambantota GSS, Kukule Ganga
PS, Matara GSS for proposed bay extensions and a new control building at Matara GSS; New
Chilaw GSS, New Habarana SS, Veyangoda GSS, Ambalangoda GSS, Bolawatta GSS, Galle
GSS, Horana GSS, Katunayake GSS, Kelaniya GSS, Kotugoda GSS and Padukka Switching
Station for the modification of protection systems (installation of new protection panels). They
are located in nine districts and five Provinces in the country (Figure 1 and Figure 2).
1 There are a number of legislative and regulatory instruments in Sri Lanka that address environmental, health
and safety management in both general and specific terms. Among these are the 1978 Constitution of
Democratic Socialist Republic of Sri Lanka and a number of acts and regulations further details of which are
included in Section 2 of the IEE.
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Table 2: Name of GSS/SS, Coordinates, District, and the Provinces
Name Coordinates District Province
1 New Anuradhapura GSS 8.296870, 80.451806 Anuradhapura North Central
2 Hambantota GSS 6.18516, 81.12766 Hambantota Southern
3 Kukule Ganga PS 6.603658, 80.284385 Kalutara Western
4 Matara GSS 5.964836, 80.534977 Matara Southern
5 New Chilaw SS 7.48667, 79.90913 Kurunegala North-western
6 New Habarana SS 8.049847, 80.726377 Anuradhapura North- Central
7 Veyangoda GSS 7.17618, 80.04331 Gampaha Western
8 Ambalangoda GSS 6.282500, 80.074116 Galle Southern
9 Bolawatta GSS 7.29427, 79.86690 Puttalam North-western
10 Galle GSS 6.04615, 80.24608 Galle Southern
11 Horana GSS 6.72948, 80.14074 Kalutara Western
12 Katunayake GSS 7.17590, 79.89420 Gampaha Western
13 Kelaniya GSS 6.969288, 79.916987 Gampaha Western
14 Kotugoda GSS 7.13284, 79.92459 Gampaha Western
15 Padukka SS 6.88071, 80.04816 Colombo Western
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Figure 1: Existing Substations in Five Provinces
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Figure 2: Existing Substations in Nine Districts with Proposed Bay Extensions and New Protection Panels
6. Some of the existing substations are fully operational, some are under construction,
some have construction works ongoing within the substation compound that are unrelated to
the project, while others have associated facilities of the project under construction (Table 3).
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Table 3: Status of Substations
Name Status
Fully Operational
Under Construction Non-Project Related Construction Ongoing
New Anuradhapura GSS
X X (08.12 2018 but now complete)
Hambantota GSS
X
X (21.11.2019 due for completion September 2021) funded by ADB Green Power Development and Energy Efficiency Improvement Investment Project (T2)
Kukule Ganga PS
X
Matara GSS X
New Chilaw SS
X
New Habarana SS
X (as of Jan 2020) due for completion September 2021, includes construction of bay and terminal tower to which project transmission line can connect, substation is funded by JICA
Veyangoda GSS X
X (04.11. 2019) Not yet completed as of June 2021
Ambalangoda GSS
X
Bolawatta GSS
X
Galle GSS X
Horana GSS
X
X (04.12. 2019) Due for completion December 2021 funded by ADB Green Power Development and Energy Efficiency Improvement Investment Project (T2)
Katunayake GSS
X
Kelaniya GSS X
Kotugoda GSS
X
X (04.11. 2019) 132 kV augmentation work and civil work ongoing as of July 2021 funded by ADB Green Power Development and Energy Efficiency Improvement Investment Project (T2)
Padukka SS
X (as of Dec 2019) funded by ADB Clean Energy and Network Efficiency
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Name Status
Fully Operational
Under Construction Non-Project Related Construction Ongoing
Improvement Project, commissioned in May 2020
E. Methodology
7. Per ADB’s Safeguard Policy Statement (2009) the environment audit is to be
undertaken by an external environment expert. Thus all 15 GSS/SS were visited by the
environment safeguard specialist from Resource Management Associates (Pvt) Ltd. during
December 2018 to January 2020. The environmental audit was based on site visits by the
external environment expert. During the site visit, visual inspections were conducted, and
critical issues were identified as per following criteria.
• General environmental management
• Waste management practices
• Hazardous material management
• Groundwater and soil contamination control
• Health and safety management, and
• Noise management
8. These criteria were translated into a checklist (Annex 1) which was used by the
external environment expert to identify implementation of good practice related to the subject
or issues that need corrective actions to meet ADB’s environment safeguard principles and
requirements.
II. AUDIT FINDINGS
9. No asbestos was observed during the audit, but CEB has been using asbestos cement
roofing sheets for substation construction and so it is likely that some form of asbestos could
be present in these substations. This risk was identified in consultation with CEB and as the
external environment expert who carried out the environmental audit was not a competent
person with respect to asbestos surveying its presence at the substations cannot be ruled out.
A. Findings for Existing Substations for Bay Extensions
(i) New Anuradhapura GSS
10. New Anuradhapura GSS, commissioned in 1998, is located at Shramadana Mawatha
in Gnanikkulama village (Gnanikulama GND, Nuwaragampalatha East DSD), about 1 km from
Galkulama- Anuradhapura main road. It was built on CEB land and the extent is 10 acres (4.2
ha). The old Anuradhapura GSS is at Galkulama-Anuradhapura main road and the distance
between the new and old GSSs is about 900m. Construction of New Anuradhapura-Mannar
220 kV transmission line, and 132 kV transmission line section to Puttalam was underway
during the site visit to the GSS on 8 December 2018. New Anuradhapura GSS has 220 kV
transmission lines from Lak Wijaya coal power plant and Kotmale hydropower station. All
construction work at the GSS was completed, but the site could not be revisited in 2021 due
to COVID-19 restrictions.
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11. The GSS has two outdoor transformers (220/132/33kV), gantries, switchgear, six 33kV
line bays, control room etc. Circuit breakers are not oil filled so will not contain PCBs, but they
do contain sulfur hexafluoride (SF6) gas as insulting medium. There was no information on
major leakages, operators monitor the pressure inside switchgear chambers and any unusual
decrease in pressure to check for SF6 leakage. Transformers use TRANSOL IEC 60296
(2003) transformer oil. CEB is in the process of testing its transformers for the presence of
PCBs. The result showed that oil in six transformers having 20.6, 24.35, 34.2, 46.24, 63.77
and 69.27 ppm of PCB. Oil pits are used instead of bunds. Ongoing construction work was
observed during the site visit. The work is being carried out with minimum impact on other
transmission line connections and equipment in the substation. However, the commissioning
and handover checklists would need to have covered environmental, health and safety
aspects to ensure a safe working environment after completion of the construction work. The
GSS is fenced and has warning signs to prevent the public from being exposed to any risk of
electrocution. Equipotential bonding has been carried out for all conductive parts in the GSS
to avoid electrical hazards.
12. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are found in
the substation buildings, workshop, and office buildings to manage uncontrolled fires.
Operators have been trained to use them. No fire suppression system was installed. Eye wash
provisions are available in the battery room. First aid box is placed in the office of the control
building.
Figure 3: Map of New Anuradhapura Grid Substation
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Note: yellow boundary shows existing GSS, pink boundary shows the area for bay extension under project (this land already belongs to CEB)
Table 4: Physical Features of New Anuradhapura Grid Substation
Features Specification
Name New Anuradhapura Grid Substation
Coordinates 8.296870, 80.451806
Land ownership (CEB/Government/Private)
CEB
Busbar Scheme Double Busbar
Substation type (Indoor/Outdoor) 220/132 kV – Outdoor
Voltage 220/132/33 kV
Switchgear type (AIS/GIS) 220/132 kV – AIS
Insulation medium power circuit breaker SF6
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, GW well, waterbody etc.
• 7.8km to Anuradhapura sanctuary
• 300m Keerikkulama wewa (tank), 2.1km to Nuwara wewa (tank), 3.7km to Nachchaduwaa wewa (tank)
• 2km to Anuradhapura airport
Nearest building to substation boundary 5 m
Nearest occupied property to substation boundary
5 m to the nearest house
Existing access An asphalt road. No major difficulties in access are anticipated
Figure 4: Photographs of New Anuradhapura Grid Substation
Plate 1. New Anuradhapura GSS. Gantry of Anuradhapura - Habarana 132 kV transmission line
Plate 2. New Anuradhapura GSS control building
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Plate 3. The land earmarked for the construction of bay extension for the New Anuradhapura- New Habarana transmission line
Plate 4. Entrance to the substation
Plate 5. Construction of Mannar 220 kV transmission line terminal tower and bays (8.12.2018)
Plate 6. Construction of bay extensions for of Mannar 220 kV transmission line
Plate 7. Used equipment/parts stored in an open area of the substation
Plate 8. Store facilities are not available
(ii) Hambantota GSS
Hambantota GSS, commissioned in 1999, is located at Keliyapura GND and Hambantota
DSD, bordering Hambantota-Gonnoruwa road, about 6km from Hambantota town. GSS land
is a CEB property and the extent is 15 acres (6.3ha). The land preparation was observed
during the field visit in November 2019 for the construction of 220/132 kV extension of the
Polpitiya-Hambantota 220 kV line (Figure 5), funded under the ADB Green Power
Development & Energy Efficiency Improvement Investment Program (Tranche 2). This work
is still in progress at present (June 2021) and it is planned to be energized by September
2021.
13. The GSS has three outdoor transformers (132/33kV), gantries, switchgear, four 33 kV
line bays, control room etc. None of the circuit breakers uses oil, so will not contain PCBs, but
they do contain SF6 gas. Gas insulated 33kV switchgear also uses SF6. SF6 gas refilling
machine (DILO 87727, Type 3-001.2. R001 Babenhausen, Germany) is available at the GSS.
There was no information on major leakages, operators monitor the pressure inside
switchgear chambers and any unusual decrease in pressure to check for SF6 leakage.
Transformers use TRANSOL IEC 60296 (2003) transformer oil. CEB is in the process of
testing its transformers for the presence of PCBs. The result showed that oil in three
transformers having 9.6 to 19.87 ppm of PCB. Oils pits are used instead of bunds. The GSS
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is fenced and has warning signs to prevent the public from being exposed to any risk of
electrocution.
14. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are found in
substation buildings, workshop, and office buildings to manage uncontrolled fires. Further, a
fire detection system is not installed in the control building. Eye wash provisions are available
in the battery room. First aid facilities are available in the control building. Substation is clean,
the provision of general facilities and yard maintenance were seen to be carried out
appropriately.
Figure 5: Map of Hambantota Grid Substation
Table 5: Physical Features of Hambantota Grid Substation
Features Specification
Name Hambantota Grid Substation
Coordinates 6.18515, 81.12766
Land ownership (CEB/Government/Private)
CEB
Busbar Scheme Double Busbar
Substation type (Indoor/Outdoor) 132 kV – Outdoor 33 kV – Indoor
Voltage 132/33 kV 220 kV is under construction
Switchgear type (AIS/GIS) 132 kV – AIS 33 kV – GIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, occupied property, waterbody etc.
• 7 km to Bundala National Park
• 7.6 km to Dry Zone Botanic Gardens
• 4.2 Maha Lewaya saltern, 4.5 Koholankala saltern
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Features Specification
• 6.5 km Hambantota Harbor, 9 km to Mattala international airport
Nearest building to substation boundary 480 m
Nearest occupied property to substation boundary
480 m to the nearest house
Existing access Paved road suitable for construction traffic
Figure 6: Photographs of Hambantota Grid Substation
Plate 1. Hambantota GSS Plate 2. Switchgear in the yard
Plate 3. Yard and control building Plate 4. Hambantota GSS
Plate 5. Bunds prepared for a new transformer
(iii) Kukule Ganga PS
15. Kukule Ganga Power Station switch yard is located in Pelpola village Kelinkanda GND
and Palindanuwara DSD, 6km downstream from the dam on Kukule river in
Ratnapura/Kalutara districts. Kukule 70MW underground hydroelectric power plant was
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commissioned in 2003 and it produces 317 GW hours annually. The extent of switch yard is
7 acres (3.1 ha) and a property of CEB. A 27 km 132 kV transmission line to Matugama GSS
originates from the switch yard.
Space for two bay extensions has been allowed during construction of the switch yard and
these extension areas will be used by the project to connect the 132 kV transmission line from
Kalawana grid substation. Circuit breakers are not oil filled so will not contain PCBs, but they
do contain sulfur hexafluoride (SF6) gas as insulting medium. The transformer found in the
power station switch yard is an auxiliary transformer with small capacity to provide electricity
to the power station control room, CEB has not yet tested it for PCBs. The substation is fenced
and has warning signs to prevent the general public from being exposed to any risk of
electrocution.
16. Kukule Ganga PS workers have access to PPE such as protective helmets (hard hats),
insulating gloves, protective eye wear (safety glasses), high visibility clothing, face shields and
enclosed footwear. Hand-held fire extinguishers (water, foam, carbon dioxide, dry power) are
found in the switch yard control building, workshop, and office buildings to manage
uncontrolled fires. There is a detection system in the control building but no fire suppression
system. First aid facilities are available in the control building, but eye wash facilities were not
seen. There is a river adjacent to the substation, but it is not considered to be at any flood
risk.
Figure 7: Map of Kukule Ganga Power Station
Table 6: Physical Features of Kukule Power Station
Features Specification
Name Kukule Ganga PS
Coordinates 6.603658, 80.284385
Land ownership (CEB/ Government/ Private)
CEB
Busbar Scheme -
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Features Specification
Substation type (Indoor/Outdoor) Outdoor
Voltage 132/33 kV
Switchgear type (AIS/GIS) AIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• 8.7 km to Morapitiya Forest Reserve Forest Reserve
• 56 m to Kukule River, 4.7 km to Kukule Reservoir
• 21.8 km to Sinharaja World Heritage site
Nearest building to switch yard boundary 20 m
Nearest occupied property to switch yard boundary
96 m to nearest house
Existing access Paved road suitable for construction traffic
Figure 8: Photographs of Kukule Power Station Switch Yard
Plate 1. Kukule Power Station Switch Yard entrance
Plate 2. Terminal tower of Matugama 132 kV transmission line
Plate 3. Switchgear Plate 4. Kukule switchgear and auxiliary power
transformer
(iv) Matara GSS
17. Matara GSS is located in Hitthatiya East 420 A GND and Matara Four Gravets DSD,
about 2.5km from Matara city centre. GSS land, 4.1 acre (1.7 ha), is a property of CEB. The
Commissioner of Agrarian Services has given the approval to fill the existing paddy land
(Godella Kumbura) with the extent of 4 acres, 01 Roods and 19 Perches, on 22nd December
1995 to construct the GSS. It was commissioned in June 1999. GSS land and the surrounding
area has been declared as Matara Kiralakele Sanctuary (333 ha) on 8th September 2003 by
the Department of Wildlife Conservation, i.e., it was declared after the substation was in
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operation. Two 132 kV transmission lines from Galle and Embilipitiya connect the grid
substation. The extent of land required for the new control building and two bay extensions for
the proposed transmission line to Hambantota GSS is available within the existing GSS
premises.
18. The GSS has three outdoor transformers (132/33kV), gantries, switchgear, six 33 kV
line bays, control room etc. Circuit breakers are not oil filled so will not contain PCBs, but they
do contain sulfur hexafluoride (SF6) gas as insulting medium. Transformers use TRANSOL
IEC 60296 (2003) transformer oil. CEB is in the process of testing its transformers for the
presence of PCBs. The result showed that oil in three transformers having 5.77 to 25.94 ppm
of PCB. Oil pits are used instead of bunds. The substation is fenced and has warning signs
to prevent the general public from being exposed to any risk of electrocution. Equipotential
bonding has been carried out for all conductive parts in the GSS to avoid electrical hazards.
19. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Hand held fire extinguishers (water, foam, carbon dioxide, dry power) are found in
substation buildings, workshop, and office buildings to manage uncontrolled fires. Fire
detection facility is not found in the control building. Eye wash provisions are not available in
battery room. First aid box is available at the office.
20. Several barrels of transformer oil were seen in an open area during the site visit on 21
November 2019. Transformer oil leaks were also observed in two transformers, and it was
unclear if the oil pits are 110% capacity. Substation is in floodplain are reported flooded on
29.5.2017.
21. In relation to bird sensitive design, insulators are installed at the existing substation.
Figure 9: Map of Matara Grid Substation
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Table 7: Physical Features of Matara Grid Substation
Features Specification
Name Matara Grid Substation
Coordinates 5.96470, 80.53445
Land ownership (CEB/ Government/ Private)
CEB
Busbar Scheme Single Busbar
Substation type (Indoor/Outdoor) Outdoor
Voltage 132/33 kV
Switchgear type (AIS/GIS) AIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• Located within the Kiralakele sanctuary close to flood control canals, 5.7 km to Kekunaduara Forest Reserve,
• 1.6 km to Nilwala River,
• 1.6 km to Matara Railway station
Nearest building to substation boundary 122 m
Nearest occupied property to substation boundary
122 m to nearest house
Existing access Paved road suitable for construction traffic
Figure 10: Photographs of Matara Grid Substation
Plate 1. Matara GSS entrance Plate 2. Terminal tower and open area
Plate 3. Gantries Plate 4. Matara GSS switchgear
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Plate 5. Stacks of transformer oil barrels next to the control building (to be transported to a store in another substation)
Plate 6. Oil leak in a transformer
Plate 3. Oil leak is visible Plate 4. The Commissioner of Agrarian Services has given the approval to fill the land for the construction of Matara grid substation in 1995, extent: 4 acres, 01 roods and 19 perches.
B. Findings for Existing Substations for Installation of New Protection Panels
(i) New Chilaw GSS
22. This substation is located at Anguruwa village in Dummalasuriya GND, Udubaddawa
DSD, in Kurunegala district. GSS land is 4 acres (1.6 ha) in extent and the adjacent 15 acres
(6.3ha) of land is earmarked for the maintenance division of CEB. The GSS was
commissioned in 2013. It receives 220 kV transmission line from Norochcholai coal power
plant. A 220 kV transmission line to Veyangoda, two 132 kV transmission lines to Madampe,
one 132 kV transmission line to Pannala and one to Katunayaka/Bolawatta originate from this
GSS.
23. The GSS has two outdoor transformers (220/132/33kV), gantries, switchgear, control
room etc. Circuit breakers are not oil filled so will not contain PCBs, but they do contain sulfur
hexafluoride (SF6) gas as insulting medium. There was no information on major leakages,
operators monitor the pressure inside switchgear chambers and any unusual decrease in
pressure to check for SF6 leakage. Transformers use TRANSOL IEC 60296 (2003)
transformer oil. CEB is in the process of testing its transformers for the presence of PCBs.
Two transformers of the GSS are having 10.12 and 13.19 ppm PCB in transformer oil. Oil pit
is used to catch any leaking transformer oil The GSS is fenced and has warning signs to
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prevent the general public from being exposed to any risk of electrocution. Equipotential
bonding has been carried out for all conductive parts in the GSS to avoid electrical hazards.
24. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are found in
substation buildings, workshop, and office buildings to manage uncontrolled fires. There is no
fire suppression system. Eye wash provisions were not available in the battery room. First aid
box and a publication on the safety rules of CEB is available in the office of control building.
There is a canal adjacent, but there are no flood/drainage issues.
Figure 11: Map of New Chilaw Grid Substation
Table 8: Physical Features of New Chilaw Grid Substation
Features Specification
Name New Chilaw Grid Substation
Coordinates 7.48667, 79.90913
Land ownership (CEB/Government/Private) CEB
Busbar Scheme Double Busbar
Substation type (Indoor/Outdoor) Outdoor
Voltage 220/132/33 kV
Switchgear type (AIS/GIS) AIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• 7.2 km to Panirendawa FR, 14.5 km to Kankaniyamulla FR
• 35 m to a canal, 365 m to Karambalan oya (stream)
Nearest building to substation boundary 35 m
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Features Specification
Nearest occupied property to substation boundary
35 m to nearest house
Existing access Paved road suitable for construction traffic
Figure 12: Photographs of New Chilaw Grid Substation
Plate 1. New Chilaw GSS control building Plate 2. Gantries
Plate 3. Two outdoor transformers (220/132 kV) Plate 4. Switchgear
Plate 5. Fire extinguishers in control building Plate 6. Control panels
(ii) New Habarana Switching Station
25. New Habarana Switching Station (220/132/33kV) is under construction (January 2020)
in a 15-acre land (6.3 ha) bordering Habarana-Maradankadawal road at Palugaswewa village
(Palugaswewa 3 GND and Palugaswewa DSD) in Anuradhapura district. It is being
constructed under JICA funding as a central substation connecting the eastern province
(through Trinco) with the north (through Anuradhapura) and south (through Veyangoda). JICA
is also funding construction of the transmission line to Veyangoda GSS which is a gateway to
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Colombo load center. Grid connection for power generation in Trinco will also be provided
through New Habarana substation in addition to the connection to the north through
Anuradhapura with 0.5 km connection line from Kotmale - New Anuradhapura transmission
line.2
26. This site was visited on 23 January 2020. A bay and terminal tower which can be used
by the proposed New Anuradhapura-New Habarana 220 kV transmission line were under
already construction as part of the substation (Figure 14).3 Six transformers have been
installed by January 2020. The transformers will be bunded and will not use PCB contaminated
oil as these are now CEB’s design standards. SF6 will be used in all circuit breakers and CEB
specifications include necessary detection and warning against leakages and handling
requirements for SF6.
27. It is still under construction as of June 2021 and due for completion in September 2021.
Figure 13: Map of New Habarana Switching Station
Table 9: Physical Features of New Habarana Switching Station
Features Specification
Name New Habarana Switching Station
Coordinates 8.049907, 80.726281
Land ownership / Extent (CEB/Government/Private)
CEB
Busbar Scheme Double Busbar
Substation type (Indoor/Outdoor) Outdoor
2 JICA. 2011. Data Collection Survey on Transmission and Distribution Loss Reduction in Democratic Socialist Republic of Sri Lanka https://openjicareport.jica.go.jp/pdf/12040184_01.pdf 3 Substation construction is not an associated facility of the project. However, an equipped bay and terminal tower that can be used by the project is under construction. Installing these in advance of transmission line construction avoids the need to connect it to the bay later, and interrupt substation operation.
21
Features Specification
Voltage 220/132/33 kV
Switchgear type (AIS/GIS) AIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil Insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• 3.2 km to Galapitagala Conservation Forest, 3.8 to Hurulu Conservation Forest, 8.5 km to Ritigala Strict Nature Reserve, 12.8 km to Minneriya National Park, 9.6 km to Inamaluwa Forest Reserve
Nearest building to substation boundary 68 m
Nearest occupied property to substation boundary
68 m to nearest house
Existing access Paved road suitable for construction traffic
Figure 14: Photographs of New Habarana Grid Substation
Plate 1. New Habarana GSS-gantry of 220 kV transmission line
Plate 2. Terminal tower that can be used for the connection of New Anuradhapura-New Habarana 220 kV transmission line, 4 tower footings visible
Plate 3. Gantries and switchgear under construction
Plate 4. The path of New Anuradhapura-New Habarana 220 kV transmission line in the scrubland
22
Plate 5. The footings of terminal tower and gantry that can be used for the New Anuradhapura- New Habarana 220 kV transmission line
Plate 6. Transformers 220/132 kV, at New Habarana SS
(iii) Veyangoda GSS
28. The GSS, commissioned in 2002, is located along Udugama road, off Divulapitiya
road, amidst home gardens and coconut plantations. The extent of the land is 8 acres (3.2
ha). This GSS receives two 220 kV transmission lines from New Chilaw and Kotugoda
substations. New Habarana-Veyangoda 220 kV transmission line and 2 x 220 kV double bus
bar transmission line bays are under construction (November 2019). CEB informed that it has
not been completed yet, June 2021.
29. The GSS has two outdoor transformers (220/132/33kV), gantries, switchgear, control
room, eight 33 kV feeders (indoor) etc. Circuit breakers are not oil filled so will not contain
PCBs, but they do contain sulfur hexafluoride (SF6) gas as insulting medium. Gas insulated
33kV switchgear also uses SF6. Transformers use TRANSOL IEC 60296 (2003) transformer
oil. CEB is in the process of testing its transformers for the presence of PCBs. The PCB levels
of transformer oil were tested and five transformers are having 13.15, 18.67, 30.76, 53.46 and
55.18 ppm. Oil pits are present to contain any leaking transformer oil. The substation is fenced
and has warning signs to prevent the public from being exposed to any risk of electrocution.
Equipotential bonding has been carried out for all conductive parts in the GSS to avoid
electrical hazards.
30. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are found in
substation buildings, workshop, and office buildings to manage uncontrolled fires. A fire
detection system is not installed in the control building. Eye wash provisions were available in
the battery room. First aid box was placed in the office room of control building.
23
Figure 15: Map of Veyangoda Grid Substation
Table 10: Physical Features of Veyangoda Grid Substation
Features Specification
Name Veyangoda Grid Substation
Coordinates 7.177008, 80.042010
Land ownership (CEB/Government/Private) CEB
Busbar Scheme Double Busbar
Substation type (Indoor/Outdoor) 220 kV and 132 kV – Outdoor 33 kV – Indoor
Voltage 220/132/33 kV
Switchgear type (AIS/GIS) 220 kV and 132 kV – AIS 33 kV – GIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• 8.8 Kotakanda FR,
• 17.5 to Katunayaka airport
Nearest building to substation boundary 20 m
Nearest occupied property to substation boundary
20 m to nearest house
Existing access Paved road suitable for construction traffic
24
Figure 16: Photographs of Veyangoda Grid Substation
Plate 1. Veyangoda grid substation, 220/132 kV transformers
Plate 2. Gantries and switchgear
Plate 3. 220/132 kV transformer Plate 4. Bay extensions
Plate 5. Construction of 2 x 220 kV bay extension (November 2019)
Plate 6. Veyangoda GSS
(iv) Ambalangoda GSS
31. This 132/33 kV GSS, commissioned in 2009, is located at Unagaswela GND in
Ambalangoda DSD, Galle district, in a 2.7-acre (1.1ha) land. It is situated in the middle of
Unagaswela village and about 150 houses are found within the 500m radius of GSS. The
distance to Madu Ganga wetlands is about 500m from the GSS boundary. The surrounding
area consists of paddy fields, cinnamon cultivated lands, coconut lands and home gardens.
The proposed modifications to protection panels will facilitate the improvement of reliability
and quality of power supply of LILO (from existing Ambalangoda-Galle 132 kV transmission
line) to the proposed Baddegama GSS. Two transmission lines currently connect, the
Ambalangoda-Galle 132 kV transmission line and the Ambalangoda-Matugama 132 kV
transmission line.
25
32. The GSS has two outdoor transformers (132/33kV), gantries, outdoor switchyard,
control building, five 33 kV feeders etc. Circuit breakers are not oil filled so will not contain
PCBs, but they do contain sulfur hexafluoride (SF6) gas as insulting medium. The bay
extension is also SF6 GIS. Transformers use TRANSOL IEC 60296 (2003) transformer oil.
CEB is in the process of testing its transformers for the presence of PCBs. The measured
PCB levels in two transformers were 13.74 and 13.22 ppm. Oil pits are used to contain any
transformer oil leakage. The substation is fenced and has warning signs to prevent the general
public from being exposed to any risk of electrocution. Equipotential bonding has been carried
out for all conductive parts in the GSS to avoid electrical hazards.
33. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are found in
substation buildings, workshop, and office buildings to manage uncontrolled fires. A fire
detection system is installed in the control building. Eye wash provisions were available in the
battery room. First aid box was placed in the office room of control building. There is a river
within 500m but no flood risk posed by it.
Figure 17: Map of Ambalangoda Grid Substation
26
Table 21: Physical Features of Ambalangoda Grid Substation
Features Specification
Name Ambalangoda grid substation
Land ownership (CEB/Government/Private)/ Extent
CEB
Coordinates 6.282504 80.074121
Busbar Scheme Main Busbar
Substation type Outdoor
Voltage 132/33 kV
Switchgear type Original existing: AIS Existing bay extension: GIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil cooled
Distance to nearest PA, IBA, PCR, building, GW well, Water body etc.
• Yakkatuwa Forest Reserve 6.7 km,
• Madu Ganga (River/Estuary) 500 m, sea 4.3 km,
• 6.5 km to Southern Expressway
Nearest building to substation boundary 16 m
Nearest occupied property to substation boundary
16 m to nearest house
Existing access Paved road suitable for construction traffic
27
Figure 18: Photographs of Ambalangoda Grid Substation
Plate 1. Existing transformers and the GIS Plate 2. Control building
Plate 3. Space for new development Plate 4. Five 33 kV feeder bays
Note: photographs were taken on 30th September 2019
(v) Bolawatta GSS
34. Bolawatta GSS, commissioned in 1988, is located in an urban area of Gonavila South
GND, Dankotuwa DSD in Puttalam district. It has 5 acres (2ha) of land and the distance to
Colombo- Puttalam main road is 2 km. About 400 houses with home gardens dominated by
coconut trees and eight roof-tile factories are found within 500m radius of the GSS. It receives
132 kV transmission line from Katunayaka GSS.
35. The GSS has three outdoor transformers (31.5 MVA), gantries, breaker switched
capacitor bays, outdoor switchgear, control building, seventeen 33 kV feeders etc. Circuit
breakers are not oil filled so will not contain PCBs, but some do contain sulfur hexafluoride
(SF6) gas as insulting medium. Transformers use TRANSOL IEC 60296 (2003) transformer
oil. CEB is in the process of testing its transformers for the presence of PCBs. The result
showed that oil in three transformers having 16.32 to 58.28 ppm of PCB. Oil pits are present
to contain any leaking transformer oil. The substation is fenced and has warning signs to
prevent the general public from being exposed to any risk of electrocution. Equipotential
bonding has been carried out for all conductive parts in the GSS to avoid electrical hazards.
36. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Hand held fire extinguishers (water, foam, carbon dioxide, dry power) are found in
28
substation buildings, workshop, and office buildings to manage uncontrolled fires. A fire
detection system is installed in the control building. Eye wash provisions were available in the
battery room. First aid box was placed in the office room of control building.
37. Store facilities for damaged switchgear and transformer oil barrels are not available in
the GSS. It is observed that these are kept in an open area of the switchyard.
Figure 19: Map of Bolawatta Grid Substation
Table 12: Physical Features of Bolawatta Grid Substation
Features Specification
Name Bolawatta Grid Substation
Coordinates 7.293456, 79.865895
Land ownership (CEB/Government/Private)
CEB
Busbar Scheme Single Busbar
Substation type (Indoor/Outdoor) Outdoor
Voltage 132/33 kV
Switchgear type (AIS/GIS) AIS
Insulation medium power circuit breaker SF6 Gas/Vacuum
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• 6.2km Kalumukalana Conservation Forest,
• 1.4 km to Ma oya (River), 3.0 km to the sea,
• 11.2 to Katunayake airport
Nearest building to substation boundary 8 m
Nearest occupied property to substation boundary
8 m to nearest house
Existing access Paved road suitable for construction traffic
29
Figure 20: Photographs of Bolawatta Grid Substation
Plate 1. Bolawatta GSS Plate 2. Transformers (31.5 MVA)
Plate 3. Gantry and busbar Plate 4. Breaker switched capacitor bays
Plate 5. Fire extinguishers Plate 6. Information on different types of fire
(vi) Galle GSS
38. The GSS, commissioned in 2015, is located in an urban area of Bataduwa GND in
Akmeemana DSD in Galle district. CEB has a 7-acre (2.8ha) land for this substation bordering
Galle-Udugama road. A paddy land is found in the western part of the GSS. A number of
buildings, houses, home gardens and paddy lands are located in 500 km radius of the GSS.
This GSS receives three 132 kV transmission lines from Matara, Balangoda and
Ambalangoda GSSs, respectively. A LILO from Galle-Ambalangoda 132 kV transmission line
will connect to the proposed Baddegama GSS. Therefore, modifications to protection panels
at Galle GSS are required.
39. The GSS has three outdoor transformers (132/33 kV), 132 kV six bays, double busbar,
gantries, outdoor switchgear, control building, 33 kV indoor GIS (13 feeders) etc. Circuit
30
breakers are not oil filled so will not contain PCBs, but they do contain sulfur hexafluoride
(SF6) gas as insulting medium. Gas insulated 33kV switchgear also uses SF6. Transformers
use TRANSOL IEC 60296 (2003) transformer oil. CEB is in the process of testing its
transformers for the presence of PCBs. The measured PCB levels in transformer oil were
10.7, 12.12 and 12.5 ppm. Oil pits are installed to contain leakage. The substation is fenced
and has warning signs to prevent the general public from being exposed to any risk of
electrocution. Equipotential bonding has been carried out for all conductive parts in the GSS
to avoid electrical hazards.
40. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are found in
substation buildings, workshop, and office buildings to manage uncontrolled fires. A fire
detection system is installed in the control building. Eye wash provisions are available in the
battery room. First aid box was placed in the office room of control building.
41. Store facilities are not available in the GSS.
Figure 21: Map of Galle Grid Substation
Table 33: Physical Features of Galle Grid Substation
Features Specification
Name Galle Grid Substation
Coordinates 6.04615, 80.24608
Land ownership (CEB/Government/Private)
CEB
Busbar Scheme Double Busbar
Substation type (Indoor/Outdoor) 132 kV – Outdoor 33 kV – Indoor
Voltage 132/33 kV
Switchgear type (AIS/GIS) 132 kV – AIS 33 kV – GIS
31
Features Specification
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• 2.6 km to Rumassala Forest Reserve, 10 km to Kottawa- Kombala Forest Reserve
• 1.6 km to the sea, 7.8 to Hiyare reservoir,
• 3.0 km to Southern Expressway
Nearest building to substation boundary 8 m
Nearest occupied property to substation boundary
11 m to nearest house
Existing access Paved road suitable for construction traffic
Figure 22: Photographs of Galle Grid Substation
Plate 1. Galle GSS entrance Plate 2. Transformers
Plate 3. Busbar and transformers Plate 4. Gantries and transformers
(vii) Horana GSS
42. Horana GSS, commissioned in February 2005, is situated in a 4-acre (1.6ha) land at
Poruwadanda village in Kekulaliya GND and Ingiriya DSD, Kalutara district. The GSS is about
1.5 km from Panadura- Ratnapura main road and surrounded by rubber plantations. The GSS
land is located within the Horana Export Processing Zone (EPZ), Board of Investment, Sri
Lanka (Figure 23). Horana GSS receives two 132 kV transmission lines from Matugama and
Pannipitiya GSSs. Two 132 kV bay extensions are under construction (December 2019) and
construction is still ongoing as of July 2021, with works due for completion by December 2021.
43. The GSS has three outdoor transformers (132/33 kV), 132 kV bays, double busbar,
gantries, outdoor switchgear, control building, 33 kV indoor GIS (18 feeders) etc. None of the
circuit breakers uses oil, so will not contain PCBs, but some do contain SF6 gas. Gas insulated
32
33kV switchgear also uses SF6. Transformers use TRANSOL IEC 60296 (2003) transformer
oil. CEB is in the process of testing its transformers for the presence of PCBs. The PCB
levels of transformers were 10.57, 93.97 and 124.11 ppm. Oil pits were installed to contain
any leakages from the transformers. The substation is fenced and has warning signs to
prevent the general public from being exposed to any risk of electrocution. Equipotential
bonding has been carried out for all conductive parts in the GSS to avoid electrical hazards.
44. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide) are found in substation
buildings, workshop, and office buildings to manage uncontrolled fires. A fire detection system
is installed in the control building. Eye wash provisions are available in the battery room. First
aid box was placed in the office room of control building.
45. Store facilities were being built (December 2019) and were completed in August 2020.
Figure 23: Location of GSS (top left) in Horana Export Processing Zone
33
Figure 24: Map of Horana Grid Substation
Table 14: Physical Features of Horana Grid Substation
Name Horana Grid Substation
Coordinates 6.72948, 80.14074
Land ownership (CEB/Government/Private) CEB
Busbar Scheme Single Busbar
Substation type (Indoor/Outdoor) 132 kV – Outdoor 33 kV – Indoor
Voltage 132/33 kV
Switchgear type (AIS/GIS)0 132 kV – AIS 33 kV – GIS
Insulation medium power circuit breaker SF6 Gas/Vacuum
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
589m to Dombagakanda Forest Reserve, 1.6 km to Edurugala Conservation Forest 676 m to Kalu Ganga river
Nearest building to substation boundary 94 m to the nearest building, 150 m to BOI factories
Nearest occupied property to substation boundary
282 m to nearest house
Existing access Paved road suitable for construction traffic
34
Figure 25: Photographs of Horana Grid Substation
Plate 1. Horana GSS Plate 2 Switchgear
Plate 3. Control building Plate 4. Two bay extensions under construction (4 December 2019)
Plate 5. New bay extensions under construction Plate 6. New bay extensions under construction
35
Plate 7. Breaker switched capacitor banks Plate 8. Transformers 132/33 kV
(viii) Katunayake GSS
46. Katunayaka GSS, commissioned in 2010, situated at the boundary of Katunayaka
Export Processing Zone (BOI) towards the north of the facility. The extent of the land is 3
acres (1.2ha) in Evariwatta GND and Katana DSD in Gampaha district. Augmentation of
Katunayake GSS was carried out in 2019, that includes installation of 31.5 MVA transformer,
construction of 1x132 kV single bus bar transformer bay, 1x33 kV transformer bay, 4x33 kV
feeder bays and 1x33 kV bus section bay. This substation connects Kotugoda and Bolawatta
GSSs with 132 kV transmission lines.
47. The GIS has three outdoor transformers (132/33kV), gantries, switchgear, twelve 33
kV feeders (indoor GIS), capacitor banks, control room etc. None of the circuit breakers uses
oil, so will not contain PCBs, but they do contain SF6 gas. Gas insulated 33kV switchgear also
uses SF6. Transformers use TRANSOL IEC 60296 (2003) transformer oil. CEB is in the
process of testing its transformers for the presence of PCBs. The PCB levels of two
transformers were 16.01 and 56.90 ppm. Oil pit is present to contain oil leaks from the
transformers. The substation is fenced and has warning signs to prevent the general public
from being exposed to any risk of electrocution. Equipotential bonding has been carried out
for all conductive parts in the GSS to avoid electrical hazards.
48. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are found in
substation buildings, workshop, and office buildings to manage uncontrolled fires. Fire
detection facility is found in the control building but no fire suppression. First aid kit is available.
Eye wash provisions are available in the battery room.
49. Storage facilities are not available in the GSS.
36
Figure 26: Map of Katunayake Grid Substation
Figure 27: Katunayake Export Processing Zone and the Location of Substation
37
Table15: Physical Features of Katunayake Grid Substation
Features Specification
Name Katunayake Grid Substation
Coordinates 7.17590, 79.89420
Land ownership (CEB/Government/Private)
CEB
Busbar Scheme Single Busbar
Substation type (Indoor/Outdoor) 132 kV – Outdoor 33 kV – Indoor
Voltage 132/33 kV
Switchgear type (AIS/GIS) 132 kV – AIS 33 kV – GIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• 3.1 km to Negombo lagoon, 6.7 km to Muthurajawela wetland
• Located outside the BOI land, 700m to the airport
Nearest building to substation boundary 15 m
Nearest occupied property to substation boundary
121 m to nearest house
Existing access Paved road suitable for construction traffic
Figure 28: Photographs of Katunayake Grid Substation
Plate 1. Entrance to Katunayake GSS Plate 2. Terminal tower and busbar
Plate 3. Control building Plate 4. Transformers and gantry
38
Plate 5. Transformer Plate 6. Gantry
(ix) Kelaniya GSS
50. Kelaniya GSS, commissioned in 1998, is situated at R.S. Perera Mawatha, Kelaniya
in Nungamugoda GND and Kelaniya DSD in Gampaha district. The distance from GSS to
Colombo- Kandy main road is 220 m. It has a 2.3-acre (0.93ha) land and connects to
Sapugaskanda, Kolonnawa and Kotugoda GSS by 132 kV transmission lines.
51. The GSS has three outdoor transformers (132/33kV), gantries, switchgear, six 33 kV
feeders (indoor GIS), control room etc. None of the circuit breakers uses oil, so will not contain
PCBs, but they do contain SF6 gas. Gas insulated 33kV switchgear also uses SF6.
Transformers use TRANSOL IEC 60296 (2003) transformer oil. CEB is in the process of
testing its transformers for the presence of PCBs. The PCB levels of two transformers were
9.19 and 68.24 ppm. Oil pits are provided to contain oil leaks from transformers. The
substation is fenced and has warning signs to prevent the general public from being exposed
to any risk of electrocution. Equipotential bonding has been carried out for all conductive parts
in the GSS to avoid electrical hazards.
52. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are found in
substation buildings, workshop, and office buildings to manage uncontrolled fires. Fire
detection facility is found in the control building but no fire suppression. First aid kit is available.
Eye wash provisions are available in the battery room.
53. Storage facilities are not available in the GSS.
39
Figure 29: Map of Kelaniya Grid Substation
Table 4: Physical Features of Kelaniya Grid Substation
Features Specification
Name Kelaniya Grid Substation
Coordinates 6.969288, 79.916987
Land ownership (CEB/Government/Private)
CEB
Busbar Scheme Double
Substation type (Indoor/Outdoor) 132 kV – Outdoor 33 kV – Indoor
Voltage 132/33 kV
Switchgear type (AIS/GIS) 132 kV – AIS 33 kV – GIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• 2.3 km to Kelani river, 5.3 km to the sea
• 1.9 km to Kelaniya temple
• 2.3 km to Katunayaka expressway
Nearest building to substation boundary 8m, 360 m to Kelaniya university
Nearest occupied property to substation boundary
8 m to nearest house
Existing access Paved road suitable for construction traffic
40
Figure 30: Photographs of Kelaniya Grid Substation
Plate 1. Kelaniya GSS, switchgear Plate 2. Control building and GIS
Plate 3. Transformers, gantry and busbar Plate 4. Gantry and busbar
(x) Kotugoda GSS
54. Kotugoda GSS, commissioned in 1983, is situated in a 6-acre (2.4ha) land at Ekala-
Kotadeniyawa main road in Opatha GND and Minuwangoda DSD in Gampaha district. It
connects Biyagama, Veyangoda and Kerawalapitiya substations by three 220 kV transmission
lines, and Katunayaka substation with a 132 kV transmission line. Construction of new bay
extension, 132 kV augmentation work and other civil works were observed during the site visit
in November 2019. This work is ongoing (July 2021) and funded by the ADB Green Power
Development and Energy Efficiency Improvement Investment Project (T2).
55. The GSS has three outdoor transformers (220/132/33kV), gantries, switchgear,
thirteen 33 kV feeders with indoor GIS, control room etc. None of the circuit breakers uses oil,
so will not contain PCBs, but they do contain SF6 gas. Gas insulated 33kV switchgear also
uses SF6. Transformers use TRANSOL IEC 60296 (2003) transformer oil. CEB is in the
process of testing its transformers for the presence of PCBs. The PCB levels of eight
transformers were 25.25, 25.59, 27.66, 28.69, 29.72, 29.72, 32.48 and 36.95 ppm. Oil pit is
used to contain leaking transformer oil. The substation is fenced and has warning signs to
prevent the general public from being exposed to any risk of electrocution. Equipotential
bonding has been carried out for all conductive parts in the GSS to avoid electrical hazards.
56. GSS workers have access to PPE such as protective helmets (hard hats), insulating
gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed
footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are found in
41
substation buildings, workshop, and office buildings to manage uncontrolled fires. Fire
detection facility is found in the control building but no fire suppression system. First aid kit is
available. Eye wash provisions are available in the battery room.
57. Storage facilities are not available in the GSS.
Figure 31: Map of Kotugoda Grid Substation
Table 17: Physical Features of Kotugoda Grid Substation
Features Specification
Name Kotugoda Grid Substation
Coordinates 7.13284, 79.92459
Land ownership (CEB/Government/Private)
CEB / 6 acres
Busbar Scheme Double Busbar
Substation type (Indoor/Outdoor) 220 kV and 132 kV – Outdoor 33 kV – Indoor
Voltage 220/132/33 kV
Switchgear type (AIS/GIS) 220 kV and 132 kV – AIS 33 kV – GIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
• 654 m to Dadugam oya, 6 km to Negombo lagoon, 5.8 km to Muthurajawela wetland
• 6.2 m Katunayaka airport
Nearest building to substation boundary 21 m
Nearest occupied property to substation boundary
21 m to nearest house
Existing access Paved road suitable for construction traffic
42
Figure 32: Photographs of Kotugoda Grid Substation
Plate 1. Entrance to Kotugoda GSS Plate 2. Gantry
Plate 3. Control building/ GIS Plate 4. Double busbar
Plate 5. Transformers Plate 6. Kotugoda switchgear
Plate 7. New bay extension under construction
43
(xi) Padukka Switching Station
58. Padukka switching station is situated at Batawala GND and Homagama DSD, in
Colombo district. The land area of the station is about 15 acres (6ha). About 100 houses and
home gardens, two temples and rubber lands are found within 500m radius of the switching
station. Construction work was almost completed as observed during the field visit on 4
December 2019. This work was funded by the ADB Clean Energy and Network Efficiency
Improvement Project. The augmentation of the switching station was funded by the ADB
Green Power Development and Energy Efficiency Improvement Investment Project, Tranche
2. The commissioning of the switching station was completed in May 2020. The switching
station will receive a 220 kV transmission line from Polpitiya GSS and next it will connect to
the Pannipitiya GSS. In addition, two 132 kV transmission lines starting at Padukka will
connect Horana and Athurugiriya substations.
59. The switching station has six outdoor transformers (220/132 kV), gantries, switchgear,
control room etc. None of the circuit breakers uses oil, so will not contain PCBs, but they do
contain SF6 gas. Gas insulated 33kV switchgear also uses SF6. Transformers use TRANSOL
IEC 60296 (2003) transformer oil. CEB is in the process of testing its transformers for the
presence of PCBs. The PCB levels of transformers oil were not tested as of June 2021. Oil pit
is present to contain oil leaks from the transformers. The switching station is fenced and has
warning signs to prevent the general public from being exposed to any risk of electrocution.
Equipotential bonding has been carried out for all conductive parts in the GSS to avoid
electrical hazards.
60. Switching station workers have access to PPE such as protective helmets (hard hats),
insulating gloves, protective eye wear (safety glasses), high visibility clothing, face shields and
enclosed footwear. Handheld fire extinguishers (water, foam, carbon dioxide, dry power) are
found in switching station buildings, workshop and office buildings to manage uncontrolled
fires. Fire detection facility is found in the control building but there is no fire suppression
system. First aid kit is available on site. Eye wash provisions are available in the battery room.
61. Storage facilities are available in the switching station.
44
Figure 33: Map of Padukka Switching Station
Table18: Physical Features of Padukka Switching Station
Features Specification
Name Padukka Switching Station
Coordinates 6.88071, 80.04816
Land ownership (CEB/Government/Private) CEB
Busbar Scheme Double Busbar
Substation type (Indoor/Outdoor) 220/132 kV – Outdoor
Voltage 220/132/33 kV
Switchgear type (AIS/GIS)0 220/132 kV – AIS
Insulation medium power circuit breaker SF6 Gas
Transformer Oil insulated
Fire protection system description Fire extinguishers
Nearest Protected Area, IBA, PCR, building, GW well, waterbody etc.
9.8 km to Miriyagalla Forest Reserve 3 km to Kelani River, 13.2 km to Labugama Kalatuwawa reservoir
Nearest building to substation boundary 58 m
Nearest occupied property to substation boundary
15 m to nearest house
Existing access Paved road suitable for construction traffic
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Figure 34: Photographs of Padukka Switching Station
Plate 1. Contractor’s signboard Plate 2. Gantries and busbar
Plate 3. Switchgear and Control Building Plate 4. Terminal tower and bay extension under
construction
Plate 5. Eye wash basin in battery room Plate 6. Fire extinguishers at control building
C. Findings of the Environment Audit
62. 15 GSS/SS lands are property of CEB. The required land area for construction of bay
extensions in the four substations is available within the existing substation premises/CEB
lands. Also, the required space for modifications to protection systems in eleven GSS/SS is
available within the control rooms/buildings.
63. GSS/SS audited that are under operation were found to be in compliance with the laws
and regulations of Sri Lanka. CEB has been found to be adequately responsive on
environmental safeguards during the operation of existing facilities, however, improvements
are required.
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64. CEB conducts maintenance works, follows waste management practices, groundwater
and soil contamination control, and occupational health and safety management in GSS/SS.
GSS/SS are all fenced or having a boundary wall and have warning signs to prevent the
general public being exposed to any risk of electrocution. Safety kits (PPE, first aid box, fire
buckets, and, fire extinguishers) are available, but not at adequate quantities in some GSS/SS.
In some substations PPE was insufficient, in terms of adequate supplies for all staff to wear.
Noise was not identified as an issue of concern at the operational GSS/SS e.g., no transformer
hum audible; but noise is not quantitatively monitored. EMF levels within and adjacent to the
GSS/SS are also not quantitatively monitored. GSS/SS are earthed and has protective shields
to minimize radiation and magnetic field effects.
65. CEB is in the process of carrying out PCB testing of its transformers to confirm if they
use PCB. Full results are awaited but PCB contamination >50 ppm has been found in several
of the project substations/transformers whilst nearly all other transformers contain PCB levels
<50 ppm.
66. Transformers have adequate oil pit/bunding.
67. SF6 is found in all circuit breakers instead of oil. CEB do no keep records of SF6
leakage.
68. Handling of hazardous material (e.g., transformer oil) needs to be improved especially
storage arrangements, as empty/filled oil barrels are seen stacked in open areas of several
GSS/SS, and the prevention of spillage, though it has been observed in only one (Matara
GSS). Waste management, handling, storage, and disposal was seen to be a problem in most
of the substations. There were no written hazardous material/waste management plans or
Environment, Health and Safety management plans and guidelines for personnel available for
each GSS/SS – CEB does not have these documents at company level either. Pieces of solid
wastes (removed parts of switchgear, cables, scraps etc.) had no specific and designated area
for collection and storage, and there was no organized disposal mechanism. Transformer oil
barrels, which are either empty or filled with oil, damaged switchgear, used conductors, and
other wastes are stored in open areas in some GSS/SS. Substation facilities should designate
special segregated area or sheds for solid and hazardous waste collection until proper
disposal. Most of the substations are not having stores/storage areas to keep these materials
until these items are removed from the GSS/SS. Further, yard cleaning is required in New
Anuradhapura GSS, Kukule Ganga Power Station, Matara GSS, Bolawatta GSS and Galle
GSS.
69. Drinking water and toilet facilities are available; designated eating area and cooking
facilities are not available.
70. Most substations are not at flood risk, but one was reported to be underwater in 2017.
71. It is felt that CEB is required to carry out corrective measure mentioned in the CAP for
compliance in regards of ADB Safeguards Policy Statement (2009) and the IFC EHS
Guidelines.
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72. Based on the findings of environmental compliance audit, it can be concluded that the
CEB has capacity to comply with environmental safeguards during the construction of bay
extensions and operation of substations.
D. Corrective Action Plan
73. The CAP responds to the audit findings and must be completed by CEB before the
commencement of 220 kV bay extension at New Anuradhapura GSS, 132 kV bay extensions
in Hambantota GSS, Kukule Ganga Power Station and Matara GSS and installation of
protection panels.
Table 5: Environmental Issues and Corrective Actions
S.no. Issue Corrective Action By whom By when Budget (source)
1 Under construction substations/substations with ongoing construction works including those works that are non-project related Commissioning and handover checklists to cover environmental, health and safety aspects to ensure a safe working environment after completion of the construction work.
CEB to ensure that works have been undertaken in accordance with any applicable EMP requirements and national laws and regulations; new transformers installed are certified PCB free and have bund/oil pit to 110% of volume; no asbestos containing materials have been used in construction including asbestos cement in the roofs of control buildings – to be confirmed by a competent person; suitably designed drainage and storage areas are provided; all solid and hazardous construction waste has been removed from site; all health and safety provisions that are the responsibility of the contractor have been provided. e.g., first aid boxes and fire extinguishers; substation boundary is secure and warning signage is in place; and the substation has been left in a clean and tidy state with no leftover debris, trip hazards etc.
CEB On handover from existing contractor/before the commencement of construction
Construction Contract
2 Health and Safety of Staff Staff need to be provided and wear appropriate personal protective equipment (PPE) at all times
CEB to ensure that adequate stocks of PPE (protective helmets (hard hats), insulating gloves, protective eye wear (safety glasses), high visibility clothing, face shields and enclosed footwear) are provided at the existing substations and worn at all times as appropriate to the tasks being undertaken/in appropriate areas in accordance with Table 2.7.1. Summary of Recommended Personal Protective Equipment According to Hazard in EHS Guideline on OHS. CEB to conduct health and safety awareness raising workshops for all existing substation staff, training is stress (i) the importance of health and safety and thus the wearing of PPE at all times to effect a behavioral/attitudinal change within the staff and (ii) the presence of, ability to recognize
CEB SS Manager with support DGM H&S/ESU
Immediately CEB O&M
48
S.no. Issue Corrective Action By whom By when Budget (source)
and risks presented from any asbestos present in the existing substations (including use of asbestos cement roofs) and the importance of staff not disturbing it unless they are competent and adequate control measures are in place to contain any asbestos dust. CEB to encourage PPE to be actively worn by staff by introducing and implementing an incentive/disciplinary system for SS
Manager and individual staff.
3 Health and Safety Equipment H&S equipment such as incomplete first aid box, lesser quantities of fire buckets and fire extinguishers needs to be addressed
CEB to ensure complete first aid kits and sufficient quantities of fire safety buckets and fire extinguishers are available at the existing substations. CEB to develop a Standard Operation Procedure (SOP) on first aid and firefighting provision and emergency response to be adopted by all GSS/SS. CEB to provide eye-wash stations and/or emergency showers close to all workstations where immediate flushing with water is the recommended first-aid response e.g., battery rooms. CEB to ensure that a qualified first-aider is available on-site (can be an existing member of staff) such that first-aid can be provided at all times. CEB to ensure that appropriately equipped first-aid stations are easily accessible throughout the place of work, they are to be signed, include a list of first-aid equipment, and use by dates as well as poster of the first aid procedures and emergency contact details/local hospital CEB to ensure that a fire marshal is always provided on-site (can be an existing member of staff) trained in emergency procedures to follow in event of fire CEB to ensure firefighting equipment maintained in good working order (e.g., last date of servicing not expired) and readily accessible – number to be adequate for size of premises, equipment installed, physical and chemical properties of substances present, and the maximum number of people present. CEB to install fire detection system with visible and audible alarms within all the control buildings of all existing substations.
CEB Before the commencement of construction
CEB O&M
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S.no. Issue Corrective Action By whom By when Budget (source)
4 Handling emergencies
CEB to ensure the establishment of a SOP for H&S Plans and the development of substation specific efficient H&S Plans and emergency response plans for each SS including requirement for checking SF6 leakage, monthly testing of fire alarms, training plan, and quarterly emergency simulation drills to be undertaken with records kept. CEB to install hazard boards within each SS indicating the hazards present and emergency response procedures including details of CEB designated emergency response team, address and phone numbers of nearest doctors, hospital, fire stations etc. CEB to conduct emergency procedures awareness raising workshop for substation staff – including conducting emergency simulation drills
CEB SS Manager with support DGM H&S/ESU
Before the commencement of construction
CEB O&M
5 Yard cleaning at Substations of New Anuradhapura, Kukule Ganga PS, Matara, Bolawatta, and Galle
CEB to undertake housekeeping to remove debris/waste from the existing substation yards. CEB to develop Standard Operation Procedure (SOP) on housekeeping which should specify GSS/SS to have stores for (i) segregation of all solid and hazardous waste generated; and (ii) environmentally sound storage of all solid and hazardous materials and waste in dedicated, labelled areas within the premises of substations. If covered, impermeable 110% bunded area is not currently available on site the SOP should require to immediately store all barrels of transformer oil, other fuel, oils, and chemicals temporarily on the drip trays; ideally undercover. CEB to construct a storage area (covered, impermeable bunded surface to contain spills and leaks) in which to keep transformer oil barrels, damaged switched gear, and other debris until the removal from the substation premises.
CEB SS Manager
Before the commencement of construction
CEB O&M
6 Unsafe storage of hazardous material and poor waste handling and disposal practices Hazardous transformer oil stored haphazardly with
CEB to implement hazardous materials and waste management system/procedure at the existing substations to include the (i) segregation of all solid and hazardous waste generated; (ii) environmentally sound storage of all solid and hazardous waste in dedicated, labelled areas within the premises of substations; and (iii) request for timely collection and transport of waste from the substation to CEB stores or by reputable, legitimate, licensed contractor and keep
CEB
Immediately
CEB O&M
50
S.no. Issue Corrective Action By whom By when Budget (source)
any bunding to prevent leakage to ground.
records of waste transfer.
CEB to ensure that all transformer oil, waste oil, and other hazardous liquids are kept in an appropriately designed storage area or on drip trays – an appropriately designed storage area would be one that is designed to contain 110% of the volume that could spill or leak from the contents. CEB to provide in a signed, accessible location on-site sufficient absorbent materials (e.g., sorbents, dry sand, sandbags) for soaking up oil spills
7 Transformer oil leakage, including actual leak at Matara GSS
CEB to repair the identified oil leak at Matara GSS and maintain all other transformers in order that oil does not leak, ensuring valves, nuts and bolts are tightly secured; and the rubber seals of the radiators of the transformers are regularly replaced (a source of oil leakage) For Matara GSS soak up existing spill following which a soil and groundwater investigation including PCB testing (if PCB were found in transformer) to be undertaken by suitably qualified consultant to confirm extent of any contamination across/beneath substation from oil leaks and spills and additional remedial measures required. CEB to ensure transformers are sited on impermeable concrete platform, provided with bunded area/oil pit to contain 110% of any spills or leaks
CEB Immediately CEB O&M
8 PCB presence in transformers
CEB to complete testing of PCBs in transformers at all existing substations/otherwise provide documentary evidence to ADB that they do not contain or are contaminated with PCBs. For those transformers that do contain PCBs surrounding soil and groundwater wells within about 50m to be tested for presence of PCB and any contamination found will need to be removed by CEB. Long term plan will be prepared to phase out the PCB containing or contaminated transformers with environmentally sound disposal, this will require replacement or de-chlorination of units following the UNEP guidance; priority to be given to those with >50ppm PCB oil. In the short term all transformers that are containing PCBs will be labelled, along with details of the concentration of PCB present.
CEB Complete PCB testing before the commencement of construction so contractor is aware of presence of PCB. Removal of PCB containing transformers by 31.12. 2025 with environmentally sound disposal by 31.12.2028 in accordance with Stockholm Convention.
CEB O&M
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S.no. Issue Corrective Action By whom By when Budget (source)
Prior to de-chlorination or disposal, any retired transformers containing PCBs to be stored on an impermeable concrete pad with bund sufficient to contain 110% of the liquid contents in case they are spilled or leak. The storage area must also have a roof to prevent precipitation from collecting in it. De-chlorination and disposal must only involve contractors and facilities licensed by CEA and capable of safely transporting and disposing of hazardous waste containing PCBs.
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ENVIRONMENTAL AUDIT CHECKLIST FOR EXISTING FACILITIES RELATED TO
CONSTRUCTION OF BAY EXTENSIONS (4 GSS) AND INSTALLATION OF PROTECTION PANELS (11 GSS/SS)
Guidelines Considered
New
An
ura
dh
ap
ura
Ham
ban
tota
Ku
ku
le
Gan
ga
PS
Mata
ra
New
Ch
ilaw
New
Hab
ara
na
Veyan
go
da
Am
bala
ng
od
a
Bo
law
att
a
Gall
e
Ho
ran
a
Katu
naya
ke
Kela
niy
a
Ko
tug
od
a
Pad
ukka
Oil in transformers and switchgear
• Transformers with risk PCB4 50 ? ? 50 50 50 50 50 ?
• Circuit breaker/risk PCB oil x x x x x x x x x x x x x x x
• PCB warning or PCB free labeling of equipment
xNI xNI x xNI xNI x xNI xNI xNI xNI xNI xNI xNI xNI x
Use of SF6
• Gas insulated switchgear
• Gas insulated transformer ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ • Presence of SF6 in switchgear
• SF6 retrieval arrangements
• SF6 leakage records ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ
Storage of liquid fuel/oil/chemical/waste: to prevent spills, soil contamination and ground and surface water contamination
• Containment Pits, Dikes, and Berms (e.g., for transformers)5
• Storage facility x x x x x x x x x x x x x
• Drainage • Oil leakage x x x x x x x x x x x x x x
• Need for extra gravel ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ
4 It cannot be assumed that any transformers are PCB free as even in recent years Sri Lanka was importing transformers contaminated with or containing PCB oil. CEB is in
process of carrying out PCB testing of its existing transformers and results from all GSS/SS are awaited. Those where the results are known and have got PCB contamination
>50 ppm are ticked with the number 50, those with <50ppm are ticked as being a risk, and those where PCB testing is still to be done/results still to be confirmed are ticked
with a question mark. 5 Oil pits present at all substations but capacity of 110% needs to be confirmed
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Workplace air quality and ventilation
• Monitoring of workplace air quality ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ • Good ventilation • Maintenance of ambient air environment
AC AC
AC
AC
AC
AC
AC
AC
AC
AC
AC
AC
AC
AC
AC
Workplace noise
• Noise control equipment/monitoring of noise levels
ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ Other Physical Agents
• Safe working area (absence of EMF etc.) • Regular monitoring equipment integrity
(earthing, protective shields, lockouts etc.)
Electrocution
• Strict procedure for de-energizing before working on electrical equipment
• Training of personnel for safety procedures Occupational health and safety guidelines
• Physical factors in the workplace signage • Lighting (including security lights) • Fire detection mechanism/equipment x x x • Firefighting equipment • Fire suppression system ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ ᵡ • Cleanliness (inside and outside
substation) NI
• First Aid Kit x • Features that pose safety risks (missing or
broken slabs, dogged holes, etc.) x x x x x x x x x x x x x x x
• Fence or enclosure of the site (restriction of unauthorized people)
Welfare Facilities
• Safe and clean drinking water • Toilets • TV/radio/internet
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• Guard kiosk
Hazards present in the workplace
• Noise • Vibration • Temperature • Hazardous materials • Biological agents • EMF
Personal Protective Equipment
• Eye and face x x x x x x x x x x x x x x x • Head • Hearing • Hand • Respiratory x x x x x x x x x x x x x x x • Leg and body
Training and Documentation
• Training (learning materials, equipment, and tools)
• Training on operational hazardous and how to control the hazards
• Training on health risks, hygiene, and exposure prevention
• Training on accidents and accident prevention, protective equipment, and clothing
Performance Monitoring
• OHSMS organization policy • Emergency prevention, preparedness, and
response NI NI NI NI NI NI NI NI NI NI NI NI NI NI NI
• Investigation of work-related injuries, ill health, diseases, and accidents
• Safety inspection, testing and calibration Material handling (hazardous and non-hazardous materials)
• Storage x x x x x x x x x x x x x x x
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• Labelling • Handling
Solid Waste/Scraps
• Storage x x x x x x x x x x x x x x x • Handling • Disposal
Space for Expansion
• Availability of space for bay extensions x x x x • Availability of space for protection panels
=Yes/OK; x- No; 50 = Yes, transformers with >50ppm PCB oil; ?= Yes, transformers not tested/no result; AC= Yes, with air conditioners; NI= It is there, but Need Improvements; OHSMS=Occupational Health & Safety Management