devol moor 132kv switchgear replacement project - ofgem

Issue Date Issue No Amendment Details

July 2019 Issue 1 First issue of document

December 2019 Issue 2 Gross cost, NPV, Monetised Risk, Long Term Risk Benefit values, delivery year and future pathways – Net zero text updated.

Devol Moor 132kV switchgear replacement project - OFGEM justification paper Name of Scheme/Programme

Devol Moor 132kV switchgear replacement project

Primary Investment Driver Asset Health (Lead asset – Circuit Breaker) Scheme reference/ mechanism or category

SPNLT 2038 (Circuit-Breaker replacement)

Output references/type NLRT2SP2038 (132kV Circuit-breaker air insulated (OD) / 132kV Switchgear others / 132kV UG cable (Non-pressurised) / 132kV Tower (OHL)line conductor)

Cost £ 8.47m Delivery Year 2025 Reporting Table C0.7 / C2.2a_CI / C2.2a_AP / C2.3 / C2.4b / C2.5 / C2.5a Outputs included in RIIO T1 Business Plan

No

OFGEM RIIO-T2 justification paper: Devol Moor 132kV switchgear replacement

Issue 2

Table of contents 1 Introduction .................................................................................................................................... 3

2 Background Information ................................................................................................................. 4

3 Optioneering ................................................................................................................................... 7

4 Detailed analysis ............................................................................................................................. 9

4.1 Reuse existing civil assets (Baseline option using SF6 live tank circuit-breaker & Option 1 using SF6 free live tank circuit-breaker / Option 3 using Disconnecting circuit-breaker) .................. 9

4.2 Replace existing civil assets (Option 2 using SF6 free live tank circuit-breaker / Option 4 using Disconnecting circuit-breaker) ................................................................................................ 10

4.3 Temporary contingency ........................................................................................................ 10

4.4 Selected option ..................................................................................................................... 11

4.5 CBA results ............................................................................................................................ 11

4.6 Environment & Sustainability ............................................................................................... 12

4.7 Innovation ............................................................................................................................. 12

5 Conclusion ..................................................................................................................................... 13

6 Future Pathways – Net Zero ......................................................................................................... 14

6.1 Primary Economic Driver ...................................................................................................... 14

6.2 Payback Periods .................................................................................................................... 14

6.3 Pathways and End Points ...................................................................................................... 14

6.4 Asset Stranding Risks ............................................................................................................ 14

6.5 Sensitivity to Carbon Prices ................................................................................................... 14

6.6 Future Asset Utilisation ......................................................................................................... 14

6.7 Whole Systems Benefits........................................................................................................ 14

7 Outputs included in RIIO T1 Plans ................................................................................................. 14

8 Appendix: Drawings ...................................................................................................................... 15


Issue 2

1 Introduction

Devol Moor 132/33kV substation is an outdoor 8 bay single busbar substation located on the Auchenfoil road near Port Glasgow. The substation has traction transformers feeding the rail network at Port Glasgow and also has 33kV indoor switchgear feeding the local distribution network.

Please find below the existing 132kV bays at Devol Moor 132/33kV substation (please refer to the GSN drawing in the appendix):

1. SGT1 2. SGT2 3. GT1A (includes T off to rail transformer T1B) 4. GT2A (includes T off to rail transformer T1B) 5. Spango Valley 1 (Referred to as SPAV1 henceforth) 6. Spango Valley 2 (Referred to as SPAV2 henceforth) 7. Braehead / Erskine Park (Referred to as BRAP/ERSK henceforth) 8. Bus section

Devol Moor 132kV substation feeds into Devol Moor 33kV indoor substation located besides the 132kV control building via GT1 and GT2.

The principal driver for the proposal is the condition of the 4 off OW410 bulk oil Circuit Breaker which all have EoL modifier scores of 10.66 or higher at end of RIIO-T2 period (without any intervention) with critical operational and maintenance issues, and so has been identified for replacement in the RIIO-T2 period. The circuit-breakers are located in following bays:

1. SGT1 2. SGT2 3. GT1A (includes T off to rail transformer T1B) 4. GT2A (includes T off to rail transformer T1B)

Note except the above circuit-breakers at Devol Moor 132kV substation, the remaining 4 off circuit-breakers are GEC Alstom HGF 1012 type SF6 circuit breaker with EoL modifier score of 3.66 or lower and are being retained and reused without any intervention.

The condition of the non-lead assets – disconnectors/earthing switches, busbars, instrument transformers, insulators and structures – have also been assessed and in all cases, intervention is required.

In line with above, the proposed 132kV outputs to be delivered in this project for the selected option are:

- 132kV Circuit Breaker disposal: 4 units - 132kV Circuit Breaker addition: 4 units

The delivery of the project is staged over 2 outage seasons with 2 circuit-breakers (along with respective non-lead assets) being replaced in a staged manner in each year. Temporary contingency works for maintaining secure supplies to the distribution network at Devol Moor substation and Spango Valley substation has also been included within all the options considered.


Issue 2

2 Background Information

This paper supports a proposal to replace the existing 4 off OW410 bulk oil circuit-breakers and associated non-lead assets at Devol Moor 132kV substation. Based on the values determined in accordance with the NOMS methodology, the circuit-breakers all have an EoL modifier score of 10.66 or higher (at end of RIIO-T2 period without any intervention), have significant operational and maintenance issues and are identified for replacement during the RIIO-T2 period. The options for retaining and refurbishing the circuit-breakers has been assessed and determined not to be technically or economically viable, as detailed in report SWG-05-090. Please find below details of the circuit-breakers identified for replacement. SPEN

corporate asset

ID

Asset Description Manufacturer Model Year of

manufacture

EoL Risk £

14150957 DEVM132OCB310 AEI/METRO VICKS OW410 TRANS 1974 10.66 £ 228,753.42




Figure 1: OW410 circuit breaker at Devol Moor 132kV substation


Issue 2

A detailed site review and technical assessment of the condition of the non-lead assets has been carried out by SP Transmission as part of this project’s development. The assessment for voltage transformers on SGT1 and SGT2 circuits has shown critical maintenance issues requiring the units to be replaced within the RIIO-T2 period. Condition assessment of the associated 132kV disconnectors have shown that the mechanical components are at a level of deterioration where intervention is required and the electrical components are at the end of their serviceable life. A significant level of corrosion has also been observed on the operating mechanism and operating rods.

Figure 2: 132kV RCP disconnectors with concrete structures at Devol Moor 132kV substation The recommendation for 132kV disconnectors is that it would be possible to refurbish them and make them operational for the expected design life of refurbished bays (40 years). However for refurbishing and reusing existing disconnectors, a substantial amount of work is required to be carried out by a specialist contractor. This involves rebuilding main contacts, sand blasting arcing rings, painting, replacing earth cables, rewiring and painting mechanism boxes, replacing contactors, relays, fuses, heaters and mechanism boxes to be tested in workshops. There is an element of added cost and time for refurbishment that needs to be reflected in the overall project timescales and costs. The costs and timescales to refurbish the disconnectors and mechanism boxes when compared with the costs and timescales to replace them indicate that replacement is the most economic option. Accordingly the associated RCP Disconnectors on these 4 bays (584, 484, 314, 214, 313A & 213A) along with other busbar disconnectors (124, 128, 614, 754 & 714) installed in the same period have been considered for replacement within all the options considered


Issue 2

A site condition assessment report for these non-lead assets, along with condition assessment of other assets at the site can be supplied as required. Recommendations from this report have been included within the options considered. Similar to the assessment of primary plant, a visual inspection has been carried out on the existing civil assets, including existing concrete structures and foundations, to determine the condition of these assets. To complement this data, and to determine the remaining life and costs associated with any immediate and future remedial works, SP Transmission commissioned a specialist concrete contractor to carry out concrete testing and analysis on a representative sample of these assets (a 132kV concrete gantry and a 132kV disconnector structure). The results of these tests show that it would be possible to reuse the existing civil assets subject to a defined level of refurbishment carried out during the project cycle. These refurbishment works would extend the service life of these assets by 15 years after which another round of refurbishment would be necessary.

The costs of refurbishing these civil assets for their extended design life (40 years to match the expected life of the electrical assets) and the cost of replacing with new steel structures has been included within the options considered.

A visual inspection report for civil assets, along with the specialist concrete surveyor’s test report is available with SP Transmission can be supplied if required.

The condition of the existing high level busbar conductor (Holtom) has deteriorated requiring intervention in the RIIO-T2 period.

The existing 132kV control building has been surveyed to determine if repair or refurbishment works are necessary and to assess the space available to accommodate replacement protection and control equipment. In line with the survey carried out, only minor repair works and building service upgrades are envisaged within the options considered.


Issue 2

3 Optioneering

The following is a summary of the options considered for this project. The respective associated drawings for each of these options are available for review if required.

Option Status Reason for rejection

Baseline option: Do nothing in RIIO-T2 period with investment deferred to RIIO-T3 period. Scope of works similar to option 1 but considering 132kV SF6 Live tank Circuit Breaker instead of 132kV SF6 free Live tank Circuit Breaker

Proposed -

1

In situ online replacement of existing dead tank 132kV Circuit Breakers with new 132kV SF6 free Live tank Circuit Breakers / CT arrangement (with reuse of busbar concrete gantries)

Proposed -

2

In situ online replacement of existing dead tank 132kV Circuit Breakers with new 132kV SF6 free Live tank Circuit Breakers / CT arrangement (replacing existing busbar concrete gantries with new high level busbar PI)

Proposed -

3 In situ online replacement of existing dead tank 132kV Circuit Breakers with new 132kV Disconnecting Circuit Breakers (with reuse of busbar concrete gantries)

Proposed -

4

In situ online replacement of existing dead tank 132kV Circuit Breakers with new 132kV Disconnecting Circuit Breakers (replacing existing busbar concrete gantries with new high level busbar PI)

Proposed -

5 Replace the existing 132kV switchgear offline Rejected

Impractical – as only 4 circuits require intervention with the remaining 4 existing circuits energised there is not much space within the substation compound for offline build / changing bay orientation.

6 Replace the 132kV AIS switchgear with new 132kV GIS switchgear Rejected Impractical – as only 4 out of 8 circuits

are being replaced.

Based on engineering design studies to determine the costs of the options identified as addressing the asset condition issues, the following 5 options have been considered for further review for this project:

- Baseline option: Do nothing in RIIO-T2 period with investment deferred to RIIO-T3 period. Scope of works similar to Option 1 but using 132kV SF6 live tank circuit breaker.

- Option 1: In situ online replacement of existing dead tank 132kV Circuit Breakers with new 132kV SF6 free Live tank Circuit Breakers / CT arrangement (with reuse of busbar concrete gantries)


Issue 2

- Option 2: In situ online replacement of existing dead tank 132kV Circuit Breakers with new

132kV SF6 free Live tank Circuit Breakers / CT arrangement (replacing existing busbar concrete gantries)

- Option 3: In situ online replacement of existing dead tank 132kV Circuit Breakers with new 132kV Disconnecting Circuit Breakers (DCB) (with reuse of busbar concrete gantries)

- Option 4: In situ online replacement of existing dead tank 132kV Circuit Breakers with new 132kV Disconnecting Circuit Breakers (DCB) (replacement of existing busbar concrete gantries)


Issue 2

4 Detailed analysis

All the 5 options considered achieve the main objective of replacing OW410 circuit-breakers while refurbishing or replacing non-lead assets and thereby reducing the overall risks to the network.

The options have been built based on the following fundamental differences:

Replace using different technology switchgear (SF6 / SF6 free live tank circuit-breaker or Disconnecting circuit-breaker

Replace or reuse existing civil assets (8 off high level concrete gantry structures)

The options are in line with SP Transmission commitment for use of new SF6 free technology where feasible, and check for alternative construction methods aimed at reducing the company’s carbon footprint. By including these option under business as usual (BAU), reuse of concrete assets, and use of SF6 free technology are in line with the core message of the SP Transmission Sustainability and Innovation policy.

Baseline option (SF6 live tank CB), option 1 (SF6 free live tank CB) and option 3 (Disconnecting circuit-breaker) are similar as these consider the refurbishment and reuse of existing civil assets (8 off high level busbar gantries), with the only difference being the type of switchgear considered. Similar options 2 and option 4 are identical as these consider the replacement of these civil assets with new high level post insulators, with the only difference again being the type of switchgear considered.

As the scope of works is almost identical, the detailed description included below has been based on this fundamental difference around the reuse of civil assets. Use of different technology switchgear is considered within the description for each alternative.

4.1 Reuse existing civil assets (Baseline option using SF6 live tank circuit-breaker & Option 1 using SF6 free live tank circuit-breaker / Option 3 using Disconnecting circuit-breaker)

Carry out detailed testing on each gantry structure to determine the exact scope of refurbishment

Based on test results complete refurbishment on each gantry structure (with bus section open 4 off gantries refurbished in first year on outage, while remaining 4 off gantries refurbished in second year)

Replace the existing Holtom overhead line conductor / insulator strings. Install either SF6 live tank 132kV circuit-breaker (Baseline option), SF6 free live tank 132kV

circuit-breaker (Option 1) or 132kV Disconnecting circuit-breaker (Option 4) as per the final preferred option

Replace existing VT with new CVTs in SGT1 & SGT2 bays In case of DCB being the preferred option, install standalone 132kV CTs for protection. In case of 132kV Live tank CB, consider installation of CTs and busbar Disconnectors. (No

busbar disconnectors considered for DCB) Existing disconnector 313B and 213B to be retained as is in the GT1B and GT2B rail track

transformer bay. New busbar post insulators installed.


Issue 2

4.2 Replace existing civil assets (Option 2 using SF6 free live tank circuit-breaker / Option 4 using

Disconnecting circuit-breaker) Replace high level concrete gantries /conductor with new 3 ph high level busbar Post

insulator arrangement. 4 off busbar gantries replaced in first outage season while remaining 4 off in second outage season.

Install either SF6 free live tank 132kV circuit-breaker or 132kV Disconnecting circuit-breaker. Replace existing VT with new CVTs in SGT1 & SGT2 bays In case of DCB being the preferred option, install standalone 132kV CTs for protection. In case of SF6 free 132kV Live tank CB, consider installation of CTs and busbar Disconnectors.

(No busbar disconnectors considered for DCB) Existing disconnector 313B and 213B to be retained as is in the GT1B and GT2B rail track

transformer bay. New busbar post insulators installed.

In all the options the existing LVAC board is proposed to be replaced with a new 16 way LVAC board. Building service boards to be replaced. The existing 110V DC system is also to be replaced.

Also the project will require being co-ordinated with ‘SPNLT 2064 Devol Moor GT2A replacement’.

All the 5 options have been planned to be completed over a construction period of 2 outage seasons.

4.3 Temporary contingency Scope of works for this temporary contingency works is the same for all options considered and has been considered as standard in the costing.

During year 1 when SGT1 / GT1A and ERSK/BRAP are on outage, the 33kV network at DEVM and SPAV are only supported by SGT2. (DEVM 33kV & SPAV33kV interconnected with no other infeed.)

In case of a fault on SGT2 the supply to 33kV network at DEVM / SPAV would be lost. To avoid this and maintain system security DEVM - ERSK 132kV OHL circuit is proposed to be used as a 33kV interconnector connecting the ERSK 33kV switchboard to DEVM 33kV switchboard.

Note this contingency was already used during Erskine transformer replacement project in RIIO T1 period, and so some of the infrastructure (33kV sealing end structure / foundation / Post insulators etc.) are already available for reuse. However previously this interconnector was designed for a much lower load requirement (for ERSK), while now the interconnector would be for a much higher load requirement at DEVM and SPAV GSPs.

For supporting the demand at DEVM and SPAV GSPs, a load requirement of 60MVA is being considered. The existing 1 x 630 sq.mm 33kV Cable at Devol Moor substation and 1 x 400 sq.mm Al XLPE cable at Erskine substation installed for the temporary interconnector works in RIIO T1 are proposed to be reused, with the additional 1 x 630 sq.mm XLPE cable installed at either ends.


Issue 2

4.4 Selected option Please find below a cost and construction timescale summary of all the options reviewed:

Baseline option – Do nothing in RIIO-T2 with investment deferred to RIIO-T3 period. Scope similar to option 1

Option 1 – 132kV SF6 free CB with reuse of civil assets

Option 2 – 132kV SF6 free CB with replacement of civil assets

Option 3 – 132kV SF6 DCB with reuse of civil assets

Option 4 – 132kV SF6 DCB with replacement of civil assets

Cost £ 8.47m £ 8.47m £ 8.51m £ 8.06m £ 8.46m

Construction timescales 2 years

Note that the costs have been built up from individual costs for each element and included in a bill of quantities. The bill of quantities has been engineered from the design layouts developed for each option. The basis of individual unit costs has been the SP Transmission MoSC (Manual of Standard Costs) tool which makes reference to costs incurred during previous similar projects.

4.5 CBA results As this project involves an option of using a SF6 free solution, along with the standard CBA, high carbon CBA analysis using the template issued by OFGEM has also been completed.

Please also find below the NPV for each of the option from CBA analysis carried:

Option NPV (£m) NPV for high carbon CBA

(£m)

Baseline option Do nothing in RIIO T2 period, works deferred to RIIO T3 period £ 26.78 £ 26.78

Option 1 132kV SF6 free CB with reuse of civil assets £ 30.02 £ 30.04

Option 2 132kV SF6 free CB with replacement of civil assets £ 29.99 £ 30.00

Option 3 132kV SF6 DCB with reuse of civil assets £ 30.41 £ 30.41

Option 4 132kV SF6 DCB with replacement of civil assets £ 30.02 £ 30.03

As can be seen, the high carbon prices have a nominal impact on the NPV values with Option 3 having the highest NPV in both scenarios.


Issue 2

4.6 Environment & Sustainability In line with company’s objective of reducing the company’s carbon footprint, the different options reviewed considers reuse of existing civil concrete gantries / foundations at site. Note reuse of civil assets avoids approximately 500m3 of concrete being classified as waste and is a sustainable initiative in line with SP Transmission RIIO-T2 sustainability policy.

4.7 Innovation Use of SF6 free AIS switchgear along with 132kV DCB have been considered here within the options considered. These represent new switchgear technology, neither of which has been used previously on the SP Transmission network.

SF6 free switchgear also helps in reducing the quantity of SF6 on the network.


Issue 2

5 Conclusion

Replacement of the OW410 units is part of an ongoing strategy aimed at replacing end of life bulk oil circuit breakers on the network and reducing the risks associated. The options considered also include replacement of end of life Non lead assets at the site which is consistent of SP Transmissions RIIO T2 strategy aimed at targeted interventions on specific sites.

The 5 options proposed have been reviewed in terms of scope, costs, timescales, construction risk, and innovation / sustainability requirements and have been found to be deliverable. All the options achieve the main objective of reducing the network risks due to OW410 bulk Oil Circuit Breakers and so are acceptable, with the only issue being that the Baseline option (Deferral to RIIO-T3 period) requires continued operation of the OW410 units till RIIO-T3 period thereby having an ongoing network risk to be managed. Hence baseline option has not been deemed feasible.

Option 3 & 4 (having higher NPV values) were deemed commercially and technically feasible, and deliverable within the RIIO T2 period. However we do not consider that the addition of SF6 assets is fully justified in this case as there is a commercially available alternative 1and it is not in line with SP Transmission sustainability policy.

Based on the detailed technical review and considering the innovation and sustainability objectives of SPT in RIIO T2 Option 1: ‘In situ replacement with 132kV live tank SF6 free Circuit Breaker and reuse /refurbish of existing busbar concrete gantries’ is the preferred option.

Note although this option has a higher capital cost and is not the preferred option in the CBA, the minimal additional cost / nominally lower NPV has been considered acceptable against the definite environmental benefits achieved.

- Forecast costs: £ 8.47m - Timing of investment: 2025 - Monetised risk benefit: Lr£38.32m - Declared outputs: Addition – 4 units / Disposal – 4 units

For the costing purposes live tank SF6 free circuit breaker costs have been considered for this submission. This is due to the absence of any alternative 132kV SF6 free switchgear currently available, but it is anticipated that alternatives will be available during the project tendering process and these shall be given full consideration to enable the most economical and efficient solution.

1 RIIO-2 Sector Specific Methodology Decision – Electricity Transmission, paragraphs 3.171 & 3.172


Issue 2

6 Future Pathways – Net Zero

6.1 Primary Economic Driver

The primary driver for this investment is asset condition and risk. The investment does not have a strong reliance on environmental benefits.

6.2 Payback Periods

The CBA indicates that a positive NPV results in all assessment periods (10, 20, 30 & 45 years) which is consistent with the lifetime of the intervention. Consumers benefit from reduced network risk immediately on completion of the project.

6.3 Pathways and End Points

The network capacity and capability that result from the proposed option has been tested against and has been found to be consistent with the network requirements determined from the ETYS and NOA processes. Additionally, the proposed option is consistent with the site-specific capacity requirements from SPT’s Energy Scenarios.

6.4 Asset Stranding Risks

Electricity generation, demand and system transfers are forecast to increase under all scenarios. The stranding risk is therefore considered to be very low.

6.5 Sensitivity to Carbon Prices

Carbon price sensitivities have been applied using the higher case CBA template. The CBA outcome is influenced by losses and is sensitive to carbon prices.

6.6 Future Asset Utilisation

It has been assessed that the preferred option is consistent with the future generation and demand scenarios and that the risk of stranding is very low.

6.7 Whole Systems Benefits

Whole system benefits have been considered as part of this proposal. The capacity and capability of the preferred option is consistent with the provision of whole system solutions.

7 Outputs included in RIIO T1 Plans N/A


Issue 2

8 Appendix: Drawings

GRID T1A

132/33kV

60MVA

ACCESS ROAD

311A

313A

124 120 128

754

750

753

751

ERSKINE / BRAEHEAD PARK

SUPERGRID T1

584

580

581

314

310

311B

313B

PORT GLASGOW 1 PORT GLASGOW 2

213B211B

210

214

SUPERGRID T2

481

480

484

615

614

611

613

GRID T2A

60MVA

132/33kV

SPANGO VALLEY 1

713711

715

714

SPANGO VALLEY 2

EARTHING

GRID T1A

TRANSFORMER TRANSFORMER

EARTHING

GRID T2A

213A211A

GRID T1B

5MVA

132/25kV

GRID T2B

132/25kV

5MVA

1T3B

GRID 1B

2T3B

GRID 2B

1PH 1PH

(RAILTRACK) (RAILTRACK)

1T1B 2T1B

GRID 1A GRID 2A

33kV

33kV SWITCHGEAR CONTAINER

DateChecked

Approved

Drawn

Project

Copyright property of SP PowerSystems Ltd. Scale Size A4

Drawn

Approved

TRS No.

Checked

TitleDate

Status

Location

Date

Date

Drg. No. Rev.

Voltage

Rev FOR ISSUE SP2005827 2.0

SWITCHGEAR NUMBERING FOR

DEVOL MOOR 132kV SUBSTATION

GSN77(A)

DEVOL MOOR 132kV

NTS

PMR 03/12/98

RL 08/12/98

DC 12/01/99

2.0 30/04/13

PMR

DJBWF

33kV SWITCHGEAR CHANGED FROM OUTDOOR TO INDOOR.

DRG. No. WAS PREVIOUSLY GSN77(A) REV D.

D

r

a

i

n

Drain

D

ra

in

T

ra

c

k

BM 197.59m

T

r

a

c

k

T

r

a

c

k

E

T

L

D

r

a

i

n

D

r

a

i

n

Issues

Issues

Well

Sheepfold

206.1m

208.2m

FB

BM 210.07m

206.8m

Tanks

AUCHENFOIL ROAD

33kVSubstation

Substation400kV

Substation132kV

DEVOL MOOR

DEVOL MOOR

DEVOL MOOR

672500N

2308

00E

'ZR' ROUTE

'BW' ROUTE

'BW' ROUTE

'G' ROUTE

25kV

CABLES - N

ETWORK RAIL

25kV

OHL

25kV

OHL

400kV SUBSTATION

33kV SUBSTATION

T1AT2A

CONCRETE ACCESS ROAD

AUCH

INFO

IL R

OAD

STOB

AND

WIR

E FE

NCE

2.440m HIGH UNCLIMBABLE FENCE

S33JW8

132kV SUBSTATIONCONTROL BUILDING

132kV SUBSTATION

CABL

E TRA

CK

CABLE TRACK

TO G

REEN

OCK

TO B

RIDG

E OF

WEI

R

B Y R

SGT2 SGT1

B Y R

Y RB

BY R

Y

R

B

B Y R

SF6 CB

S33

25kV CABLE TRACK

Y R

SPANGO VALLEY 2

PI 4.6

DISC

SG8.

6

SEs

207.874

207.874

206.654

206.654

33kV CABLE TRACK

EX PILOT CABLESM/H

M/H

M/H

M/H

M/HM/H

M/H

M/H

M/H

132kV CABLES

B Y R

B Y R

RETAINING WALL

Y R B

R

B

Y

2.74

3m H

IGH

U/C

FENC

E

TO TRACKSIDE FEEDERSTATION, PORT GLASGOW

T2B

SCALE

0m 5m 10m 15m


M/H

CB CT

PI SEDISC

VT

T1B

2.44

0m H

IGH

UNCL

IMBA

BLE

FENC

E

GENERATORDIESEL

M/H

M/H

BUT ACCURACY OF ROUTES OF UNDERGROUND SERVICES CANNOT BE GUARANTEED.DRAINAGE AND CABLE ROUTES SHOWN ARE TAKEN FROM EXISTING RECORDS

NOTES:

DENOTES LIGHTING STANDARD, ARROW INDICATES MAINTAINANCE SIDE.

MANHOLE

'G' ROUTEERSKINE/BRAEHEAD PARK

TOP-YELLOW

MID-RED

BTM-BLUE

CABL

E DU

CT

5800

9715

EXISTING SEALING ENDS

EXISTING DISCONNECTOR

EXISTING CIRCUIT BREAKER




EXISTING C.V.T.s

EXISTING SG8.6 GANTRY

SURGE ARRESTERS

51805180762011615515051507652

PD24 S33

S33 PD

24

CIRC

UIT

BREA

KER

6000 3500 3000 3000

1220

CB CT

6000

OIL TANKS

CLEAN

DIRTY

SF6

12900

5800

PI 4.6

DISC

2875

5705

3615

6555

2300

5638

EXISTING S33


EXISTING S.A.s

9675

2232

5

2020

0

1790

0

34835542

S33 S33

110490

132kV CABLES

33kV CABLE TRACK

CONTROLROOM

WORKSHOP

L.V.A.C.ROOM

BATTERYROOM

TELECOMSROOM

MESSROOM

WC

2.44

0m H

IGH

UNCL

IMBA

BLE

FENC

E

2.74

3m H

IGH

UNCL

IMBA

BLE

FENC

E

Y R Y R

PhNPh

N

Ph

N

MKMK

SAs

2440

2440

1198

5

ES ES

ES

PI SEDISC

VT

3500 3000 3000

PhN

ES

ES

ES

REDUNDANT P.I.s

SG33

2079

6

2079

6

SG33

SECTION ON 'C-C'SECTION THROUGH T2A BAY / SGT2 FEEDER SIMILAR

PLAN ON SUBSTATION

A

A

B

B

C

C

D

D

HEIGHTGAUGE

HEIGHTGAUGE

REFERENCE DRAWINGSP4048204 ELECTRICAL LAYOUT OF DEVOL MOOR 400kV SUBSTATIONSP2004366 ELECTRICAL LAYOUT OF DEVOL MOOR 132kV SUBSTATIONSP2103111 ELECTRICAL LAYOUT OF DEVOL MOOR 33kV SUBSTATION

OILPLANTROOM

COMP.HOUSE

NETWORK RAIL TRANS.132/25kV 5MVAEX-GREENOCK


TOWER BW1ATYPE STSPEC. CSPL1

TOP-YELLOWMID-BLUEBTM-RED

SPANGO VALLEY 1

TOP-REDMID-BLUEBTM-YELLOW

TOWER BW1BTYPE ST E20SPEC. CSPL1

ACCESS ROAD TO400kV SUBSTATION

400kVCONTROLBUILDING

2.743m WIDE CONCEALEDHARDCORE ACCESS WAY

TOWER G76TYPE STSPEC CS PL1

SAFETYSCREENS.E. PLATFORM

(DISUSED)

EXISTING C.V.T.

NEW 132/33kV 60MVATRANSFORMER

5.9m WIDEDOUBLE LEAFGATES

E

E

P.I. HIGH P.I. LOW P.I. HIGHP.I. HIGH

P.I. HIGH

3615 5600 6770 2500 3200 4605 3490 3000

SECTION ON 'E-E'

3000

B Y R

OIL TRENCH

CABLE TRENCH

OIL TRENCH

CABLE TRENCH OIL TRENCH

OIL TRENCH

OIL TRENCH

CABLE TRENCH

CABLE TRENCH

CABL

E TR

ENCH

SEPT

IC T

ANK

150 P.C.

DRAIN

100 D.I. DRAIN

OIL/WATERSEPARATOR

7795

3240

4550

7735

1000

3000

3000

7625 12950 6630 6630 12955 11580

2300

1000

3000

3000

3490

3795

3000

3500

3900

3935

6065

3700

3700

2620 6795 2500

2500

2145

2500

2130

5600

268013101890

1880

030

00S

EX C

.B.

EX D

ISC.

EX C

.V.T

.s

EX C

.B.

EX D

ISC.

EX D

ISC.

FENC

E

3658

FENC

E

532630003500390019521952370037003000

EX S

.E.s

EX S

.A.s

SG8.6 GANTRYERSKINE/BRAEHEAD PARK

SECTION ON 'D-D'

4.572m x 2.4m HIGHVEHICLE PASSAGE


3048 3048

3960

S

FENC

E

6555 6553 3000 2300 5640 3658S3

3

EX C

.V.T

.

SGT1



4605 3490 3000 10003635246029801895

S

FENC

E

3658

FENC

E

20726410058001116457240266912

EX D

ISC.

EX P

.I.

S33J

W8

EX P

.I.

3993

T1B132/25kV 5MVATRANSFORMER CABLES TO

T1A


SECTION ON 'B-B'SECTION THROUGH T2B BAY / T2A FEEDER SIMILAR EXCEPT AS SHOWN


1524

S

1067 S33J

W8

FENC

E

36584135323945525752786824402440

EX S

.A.s

EX C

.B.

SAFETYSCREEN

EX S

.E.

SG8.6GANTRY

SPANGO VALLEY 2

SECTION ON 'A-A'


3048 3048889

NEW

DIS

C.

2382

EX S

.A.

1000 2300

T2A

NEW

P.I.

NEW

DISC

.

NEW

E.S

w

NEW

C.B

.

NEW

C.T

.

NEW

C.B

.

EX C

.V.T

.

1981

PHASE TO EARTH (E)PHASE TO PHASE (P)

SURGE ARRESTER (D)SECTION CLEARANCE (S)

MINIMUM ELECTRICAL CLEARANCES AT 132kV, AT 33kV, AT 25kV

1.1m3.8m1.4m1.1m

0.78m0.5m

0.5m3.2m

0.7m3.4m

0.5m 0.7m

S.A.

S.Es

S.A.

P.I.

NCT

N.E.R.

NEW DISCONNECTORNEW DISCONNECTOR

NEW DISCONNECTOR

EXISTING DROPPERS TO BERE-CONNECTED TO NEWDISCONNECTOR

NEW

C.T

.

NEW

DIS

C

NEW

DIS

C

NEW

C.T

.

EARTHING/AUX TRANSF.

EX S

.E.

EX S

.A.

EX S

.E.

EX S

.A.

MIDEL FILLEDE.Sw.

Y R

GT2BFEEDER

NEW DISCONNECTORFOUNDATION TO BEFORMED ON BOTH SIDESOF TRENCH.TRENCH SHOULD NOT BEDISTURBED.

3200

6770

2145

2500

SPANGO VALLEY 1 132kV CABLESHAVE BEEN LAID IN THIS AREA -NEW D.C.B. FOUNDATIONS ON T1 &T2 CIRCUITS MAY REQUIRE TO BESPLIT-DUCTED AROUND THESEEXISTING CABLES.

E.Sw. E.Sw.

E.Sw.E.Sw.

E.Sw.E.Sw. E.Sw.E.Sw.

E.Sw.

E.Sw.

NEW C.T.s

NEW C.B.

NEW E.Sw

NEW C.T.s

NEW C.B.

EXISTING C.V.T.

NEW C.B.

NEW C.T.s

Y

R

B

EXISTING GANTRY

EXISTING GANTRY

EXISTING GANTRY EXISTING GANTRY

EXISTING GANTRY

3050

3050

3050

3050

3490

4605

NEW

DISC

.

NEW

DISC

.

NEW

DIS

C

NEW

C.B

.

NEW E.Sw

NEW

DIS

CONN

ECTO

R

NEW

DIS

CONN

ECTO

R

NEW DISC

4100

NEW DISC

2870

NEW C.B.

NEW C.T.s

SPLIT DUCTS REQUIREDIN FOUNDATION

4760

NEW DISC

SPLIT DUCTSREQUIRED INFOUNDATION

3873 2871

NEW

DIS

C

NEW

DIS

C

889

NEW

C.T

.

NEW

C.B

.

S.E.

s

132/

33kV

60M

VA

PDE1

9 E1

0

P.I.

TRAN

SFOR

MER

P.I.

SUPP

ORT

3874

EX S

.E.

NEW

P.I.

E.SwE.Sw

E.Sw

E.Sw

NEW

E.S

w

E.Sw.

E.Sw.

E.Sw.

E.Sw.

E.Sw.

E.Sw.

E.Sw.

E.Sw.

E.Sw.

E.Sw E.SwE.Sw E.SwE.Sw E.Sw E.Sw E.Sw

E.Sw E.Sw

Size:

Drawn Rev'd App'd

Project:

Drg. No.: Rev:

All rights reserved. Total or partial reproduction of this drawing without authorisation of the proprietor is prohibited.

Scale:

Drg. Title:

Sheet:

Next:

Location:

Drawing State:

Approval Status:

65 7 8 9 10 11 124 13321 14 15 16 17 18 19 20 21 22 23 24

65 7 8 9 10 11 124 13321 14 15 16 17 18 19 20 21 22 23 24

E

D

F

G

H

J

C

B

A

K

L

M

N

P

Q

R

E

D

F

G

H

J

C

B

A

K

L

M

N

P

Q

R

A0

Voltage:

DEVOL MOOR 132KV SUBSTATION

DEVOL MOOR 132/33kV

PROPOSED ELECTRICAL LAYOUTOF DEVOL MOOR 132kV SUBSTATION

FEASIBILITY USING SIEMENS VACUUM CIRCUIT BREAKERS

SP4148822

No State

N/A

0

Rev Date Drawn Reviewed Approved Description of Change

0 22/03/2019 FOR REVIEW

D

r

a

i

n

Drain

D

ra

in

T

ra

c

k

BM 197.59m

T

r

a

c

k

T

r

a

c

k

E

T

L

D

r

a

i

n

D

r

a

i

n

Issues

Issues

Well

Sheepfold

206.1m

208.2m

FB

BM 210.07m

206.8m

Tanks

AUCHENFOIL ROAD

33kVSubstation

Substation400kV

Substation132kV

DEVOL MOOR

DEVOL MOOR

DEVOL MOOR

672500N

2308

00E

'ZR' ROUTE

'BW' ROUTE

'BW' ROUTE

'G' ROUTE

25kV

CABLES - N

ETWORK RAIL

25kV

OHL

25kV

OHL

400kV SUBSTATION

33kV SUBSTATION

T1AT2A

CONCRETE ACCESS ROAD

AUCH

INFO

IL R

OAD

STOB

AND

WIR

E FE

NCE


S33JW8

132kV SUBSTATIONCONTROL BUILDING

132kV SUBSTATION

CABL

E TRA

CK

CABLE TRACK

TO G

REEN

OCK

TO B

RIDG

E OF

WEI

R

B Y R

SGT2 SGT1

B Y R

Y RB

BY R

Y

R

B

B Y R

SF6 CB

S33

25kV CABLE TRACK

Y R

SPANGO VALLEY 2

PI 4.6

DISC

SG8.

6

SEs

207.874

207.874

206.654

206.654

33kV CABLE TRACK

EX PILOT CABLESM/H

M/H

M/H

M/H

M/HM/H

M/H

M/H

M/H

132kV CABLES

B Y R

B Y R

RETAINING WALL

Y R B

R

B

Y

2.74

3m H

IGH

U/C

FENC

E

TO TRACKSIDE FEEDERSTATION, PORT GLASGOW

T2B

SCALE

0m 5m 10m 15m


M/H

CB CT

PI SEDISC

VT

T1B

2.44

0m H

IGH

UNCL

IMBA

BLE

FENC

E

GENERATORDIESEL

M/H

M/H

BUT ACCURACY OF ROUTES OF UNDERGROUND SERVICES CANNOT BE GUARANTEED.DRAINAGE AND CABLE ROUTES SHOWN ARE TAKEN FROM EXISTING RECORDS

NOTES:

DENOTES LIGHTING STANDARD, ARROW INDICATES MAINTAINANCE SIDE.

MANHOLE

'G' ROUTEERSKINE/BRAEHEAD PARK

TOP-YELLOW

MID-RED

BTM-BLUE

CABL

E DU

CT

5800

9715

EXISTING SEALING ENDS






EXISTING C.V.T.s

EXISTING SG8.6 GANTRY

SURGE ARRESTERS

51805180762011615515051507652

PD24 S33

S33 PD

24

CIRC

UIT

BREA

KER

6000 3500 3000 3000

1220

CB CT

6000

OIL TANKS

CLEAN

DIRTY

SF6

12900

5800

PI 4.6

DISC

2875

5705

3615

6555

2300

5638

EXISTING S33


EXISTING S.A.s

9675

2232

5

2020

0

1790

0

34835542

S33 S33

110490

132kV CABLES

33kV CABLE TRACK

CONTROLROOM

WORKSHOP

L.V.A.C.ROOM

BATTERYROOM

TELECOMSROOM

MESSROOM

WC

2.44

0m H

IGH

UNCL

IMBA

BLE

FENC

E

2.74

3m H

IGH

UNCL

IMBA

BLE

FENC

E

Y R Y R

PhNPh

N

Ph

N

MKMK

SAs

2440

2440

1198

5

ES ES

ES

ES

PI SEDISC

VT

3500 3000 3000

PhN

ES

ES

ES

REDUNDANT P.I.s

SG33

2079

6

2079

6

SG33

SECTION ON 'C-C'SECTION THROUGH T2A BAY / SGT2 FEEDER SIMILAR

PLAN ON SUBSTATION

A

A

B

B

C

C

D

D

SPENExisting

HEIGHTGAUGE

HEIGHTGAUGE

REFERENCE DRAWINGSP4048204 ELECTRICAL LAYOUT OF DEVOL MOOR 400kV SUBSTATIONSP2004366 ELECTRICAL LAYOUT OF DEVOL MOOR 132kV SUBSTATIONSP2103111 ELECTRICAL LAYOUT OF DEVOL MOOR 33kV SUBSTATION

OILPLANTROOM

COMP.HOUSE



TOWER BW1ATYPE STSPEC. CSPL1

TOP-YELLOWMID-BLUEBTM-RED

SPANGO VALLEY 1

TOP-REDMID-BLUEBTM-YELLOW

TOWER BW1BTYPE ST E20SPEC. CSPL1

ACCESS ROAD TO400kV SUBSTATION

400kVCONTROLBUILDING

2.743m WIDE CONCEALEDHARDCORE ACCESS WAY

TOWER G76TYPE STSPEC CS PL1

SAFETYSCREENS.E. PLATFORM

(DISUSED)

EXISTING C.V.T.



5.9m WIDEDOUBLE LEAFGATES

P.I. LOW

E

E

P.I. HIGH P.I. LOW P.I. HIGHP.I. HIGH

P.I. HIGH

3615 5600 6770 2500 3000 5000 3000 3290

SECTION ON 'E-E'

3000

P.I. HIGH

P.I. HIGH

P.I. HIGH

P.I. HIGH

B Y R

P.I. LOWP.I. LOW

P.I. LOWP.I. LOWP.I. LOW



P.I. HIGH

P.I. HIGH

P.I. HIGH

OIL TRENCH

CABLE TRENCH

OIL TRENCH

CABLE TRENCH OIL TRENCH

OIL TRENCH

OIL TRENCH

CABLE TRENCH

CABLE TRENCH

CABL

E TR

ENCH

SEPT

IC T

ANK

150 P.C.

DRAIN

100 D.I. DRAIN

OIL/WATERSEPARATOR

7795

3240

4550

7735

1000

3000

3290

7625 12950 6630 6630 12955 11580

2300

1000

3000

3290

3000

3000

3795

3000

3500

3900

3935

6065

3700

3700

2620 6795 2500

2500

2145

2500

2130

5600

268013101890

1880

030

00

1005

1495

2990 2135 3230 2650 7650

2500

6770

5600

3615

S S

EX C

.B.

EX D

ISC.

EX C

.V.T

.s

EX C

.B.

EX D

ISC.

EX D

ISC.

FENC

E

3658

FENC

E

532630003500390019521952370037003000

EX S

.E.s

EX S

.A.s

SG8.6 GANTRYERSKINE/BRAEHEAD PARK

SECTION ON 'D-D'



3048 3048

T1A

3615

S S

FENC

E

4055 4000 2500 3000 2300 5640 3658S3

3

EX C

.V.T

.

SGT1

3000



2500 3000 3290 1000645250021305600

S S

FENC

E

3658

FENC

E

1767830487097100658001116457240266912

EX D

ISC.

EX P

.I.

S33J

W8

EX P

.I.

8481

T1B132/25kV 5MVATRANSFORMER CABLES TO

T1A


SECTION ON 'B-B'SECTION THROUGH T2B BAY / T2A FEEDER SIMILAR EXCEPT AS SHOWN


30481494

S

1067 S33J

W8

FENC

E

36584135323945525752786824402440

EX S

.A.s

EX C

.B.

SAFETYSCREEN

EX S

.E.

SG8.6GANTRY

SPANGO VALLEY 2

SECTION ON 'A-A'


3048 3048889

NEW

DIS

C.

2382

NEW

P.I.

NEW

P.I.

NEW

P.I.

EX S

.A.

NEW

P.I.

NEW

DIS

C

NEW

D.C

.B.

NEW

D.C

.B.

1000 2300

T2A

NEW

P.I.

NEW

DISC

.

NEW

P.I.

NEW

P.I.

NEW

P.I.

NEW

D.C

.B.

NEW

C.T

.

NEW

D.C

.B.

EX C

.V.T

.

1981

PHASE TO EARTH (E)PHASE TO PHASE (P)

SURGE ARRESTER (D)SECTION CLEARANCE (S)

MINIMUM ELECTRICAL CLEARANCES AT 132kV, AT 33kV, AT 25kV

1.1m3.8m1.4m1.1m

0.78m0.5m

0.5m3.2m

0.7m3.4m

0.5m 0.7m

S.A.

S.Es

S.A.

P.I.

NCT

N.E.R.

NCT

N.E.R.

2725

NEW DISCONNECTORNEW DISCONNECTOR

NEW DISCONNECTOR

EXISTING DROPPERS TO BERE-CONNECTED TO NEWDISCONNECTOR

NEW

C.T

.

NEW

P.I.

NEW

P.I.

NEW

P.I.

NEW

P.I.

NEW

DIS

C

NEW

DIS

C

NEW

C.T

.

NEW

C.T

.

EARTHING/AUX TRANSF.EARTHING/

AUX TRANSF.

EX S

.E.

EX S

.A.

EX S

.E.

EX S

.A.

MIDEL FILLED

MIDEL FILLED

2145

2500

E.Sw.E.Sw.

Y R

GT2BFEEDER

NEW DISCONNECTORFOUNDATION TO BEFORMED ON BOTH SIDESOF TRENCH.TRENCH SHOULD NOT BEDISTURBED.

3000

6770

2145

2500

SPANGO VALLEY 1 132kV CABLESHAVE BEEN LAID IN THIS AREA -NEW D.C.B. FOUNDATIONS ON T1 &T2 CIRCUITS MAY REQUIRE TO BESPLIT-DUCTED AROUND THESEEXISTING CABLES.

E.Sw. E.Sw.

E.Sw.E.Sw.

S.A.

S.Es

S.A.

P.I.

E.Sw.E.Sw. E.Sw.E.Sw.

E.Sw. E.Sw.

E.Sw.

E.Sw. NEW P.I.s

NEW C.T.s

NEW D.C.B./E.Sw

NEW P.I.s

NEW C.T.s

NEW D.C.B./E.Sw

EXISTING C.V.T.

NEW D.C.B./E.Sw NEW D.C.B./E.Sw

NEW C.T.sNEW C.T.s

5500

GT1B FEEDER

Y

R

B

EXISTING GANTRY

EXISTING GANTRY

EXISTING GANTRY EXISTING GANTRY

EXISTING GANTRY

3050

3050

3050

3050

Size:

Drawn Rev'd App'd

Project:

Drg. No.: Rev:

All rights reserved. Total or partial reproduction of this drawing without authorisation of the proprietor is prohibited.

Scale:

Drg. Title:

Sheet:

Next:

Location:

Drawing State:

Approval Status:

65 7 8 9 10 11 124 13321 14 15 16 17 18 19 20 21 22 23 24

65 7 8 9 10 11 124 13321 14 15 16 17 18 19 20 21 22 23 24

E

D

F

G

H

J

C

B

A

K

L

M

N

P

Q

R

E

D

F

G

H

J

C

B

A

K

L

M

N

P

Q

R

A0

Voltage:

DEVOL MOOR 132KV SUBSTATION

DEVOL MOOR 132/33kV

PROPOSED ELECTRICAL LAYOUTOF DEVOL MOOR 132kV SUBSTATION

FEASIBILITY USING DCBs AND EXISTING GANTRIES

SP4147183

No State

N/A

0A

Rev Date Drawn Reviewed Approved Description of Change

0A 12/09/2018 SC FOR REVIEW

devol moor 132kv switchgear replacement project - ofgem

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