dpr for hvds at ellahibagh_final

7/28/2019 DPR for HVDS at Ellahibagh_final

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Minimization of Losses by Implementing High Voltage Distribution System

JAMMU & KASHMIR POWER

DEVELOPMENT DEPARTMENT (JKPDD),

PROJECT REPORT

FOR

HVDS IMPLEMENTATION

FOR

LT CONSUMERS OF ELLAHIBAGH & 90 FEET

ROAD ELECTRIC DIVISION-IV,

SUB-DIVISION, HAWAL / RAINAWARI.


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CONTENTS

CHAPT DESCRIPTIONPAGES

FROM TO

01.00 GENERAL INTRODUCTION 03 05

02.00ADOPTION OF HIGH VOLTAGE DISTRIBUTIONSYSTEM (HVDS)

06 07

03.00ELECTRIC POWER INSTALLED CAPACITY, ITSAVAILABILITY & CONSUMPTION

08 09

04.00 IMPLEMENTATION STRATEGY 10 11

05.00BRIEF DESCRIPTION OF WORK AND ELECTRICALSYSTEM DESIGN CRITERIA

12 12

06.00 PROPOSED OVERALL SYSTEM PREVIEW 13 15

07.00 TECHNICAL DESCRIPTION 16 18

08.00 COST ESTIMATES 19 22

09.00 LIST OF STANDARDS 23 24

10.00 SUMMARY OF CONCLUSIONS 25 25

LIST OF SPECIFICATION DRAWINGS ENCLOSED

S.No. DRAWING NO. TITLE

01 DIV-IV/HVDS/REPORT/001PROPSED ARRANGEMENT OF HVDS

UNITS

02 DIV-IV/HVDS/REPORT/002 ARRANGEMENT OF ABC CABLE

03 DIV-IV/HVDS/REPORT/003 TYPICAL EARTHING PIT

01.00 GENERAL INTRODUCTION


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01.01 Introduction to Distribution System

In general, electric power is generated at the power stations which are located at

the places quite away from the consumers; it is then delivered to the consumers through a

large network of transmission and distribution. Earlier, DC generators were connected to

the loads at same voltage for electricity distribution because there was no way of

changing DC voltage levels. Generally, DC generating plants used to be within desired

radius providing power supply to consumers & to avoid large and expensive conductors,

low voltages were used requiring less insulation and transmission network employed

copper which in turn, increased the losses

The present day electrical power system is AC. The power transformers installed

at power stations raises the generation voltage. to higher level (say 220KV or 132KV) for

electric power transmission. Electric power at 220KV is transmitted by three-phase, three-

wire overhead system to the outskirts of the city and this power is then received by the

primary Grid-station which reduces the voltage level further to 33KV. This voltage is

further stepped down to 11KV at secondary sub-station (Receiving stations) located at

some strategic points in the city. Transformers near the consumer localities step down the

Voltage level to lower level (415V, 3-phase 4-wire) to supply the loads thereby, distribution

of power to long distances became more economical and the distribution losses, size of

conductors got enhanced. The voltage between any two phases is 415V and between any

phase and neutral is 230V. This single-phase 230V is distributed to the residential and

commercial load and three-phase, 415V motor load is connected across the three-phase

lines directly. Most of the distribution sub-stations are pole mounted type. Conductors

require for the distribution may be carried on overhead pole lines or can be buried

underground in densely populated areas.

01.02 Existing low voltage distribution system (LVDS)

The existing distribution system in India employs large three-phase 11KV main distribution

feeders with three-phase spur lines and three-phase distribution transformers

transforming 11KV into 400V. Distribution system with low voltage employs four corecables and long low tension lines and multiple loads fed from a bulk power transformer

resulting in the increase in system losses affecting voltage profile and performance of

distribution system. Low voltage distribution is done either by three-phase four-wire, three

phase five-wire, single phase three-wire and single phase two-wire low tension lines.

Generally, in the process of supplying electricity to the consumers, energy losses occur

due to technical and commercial losses. The technical losses are mainly caused by the

energy dissipated in the conductors and equipment used for transformation, transmission

and distribution of power. The commercial losses are caused by pilferage, errors in themeter reading or defective meters and in the estimation of unmetered energy supply.


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These losses depend on the load density, energy pattern used and configuration of

transmission and distribution system.

01.03 Reasons for High Technical and Commercial Losses

Improper load management resulting in overloading of conductor and

transformers. Also, the pumping loads and industrial loads in areas results in low

power factor which in turn, increases the losses.

Inadequate investment in transmission and distribution system resulting in the

overloading of the distribution system.

Undesired location of distribution transformers increases the overall length of

distribution network causing low voltage at the consumers point.

Employment of poor workmanship and use of inferior quality equipment in areasand in industrial loads in urban areas are some factors greatly affecting the

process of distribution network.

Old equipments are not maintained, repaired and upgraded properly. Even,

capacitors for power factor correction are not installed.

Loss of power is done by deteriorated wires and services.

Improper testing and calibration of meters, changing sequence of terminal wiring

and current transformer ratio reduces the recording.

Loads are widely dispersed and low tension lines run for long distances to feed small

loads. Low voltage distribution network results in large faults leading to the frequent

interruptions in supply and distribution transformer failures due to low tension fault

currents. This distribution system is unsuitable to serve in densely populated areas.

Monitoring of low voltage feeders is very difficult and low voltage feeders have

considerable voltage drop which is a cause of high current losses beyond loading

limits.

01.04 Drawbacks of LVDS


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Higher losses, poor tail end voltages, more fluctuations in voltage and frequent cuts

fuse blowouts.

Due to frequent faults, more failures in distribution transformer and its maintenance

and repair requires high expenditure. Due to delay in replacement of failed distribution

transformers, there is a great loss & burden on state exchequer & huge public outcry.

Unauthorized hooking or tapping the bare conductors of low tension feeder or

tampered service lines and monitoring of low voltage feeders is really very difficult.

In case of any failure in three-phase large capacity distribution transformer, entire unit

is to be replaced which consumes more time.

After analyzing the pros and cons of low voltage distribution system, it is clear

that there is a great need to reduce the losses in the existing distribution

network. Some measures can be taken to minimize the technical as well ascommercial losses to some extent and that are:

Identification of weakest areas in the distribution system and strengthening them so as

to draw the maximum benefits by way of extracting more revenue of the limited

resources available.

The increase in the load density increases the current density in same proportion

which in turn, increases the need of more transforming centers, so a proper strategy is

required to be carried out in order to overcome the drawbacks of low voltage

distribution system.

In existing LVDS, lengthy 11 kV LT lines are laid Minimization of Losses by

Implementing High Voltage Distribution System employing three-phase DTRs of

capacity 630kVA, 500kVA, 400kVA, 100 KVA or 63kVA feeding large number of

consumers resulting in poor tail end voltages, high losses, frequent faults, cuts. DTR

failures causing loss besides huge public outcry. To overcome all these problems,

implementation of high voltage distribution system is considered as the best move to

enhance the performance of distribution system

02.00 ADOPTION OF HIGH VOLTAGE DISTRIBUTION SYSTEM (HVDS)


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The losses in Indian Power System are around 51.80%% and are inherent during the

processing and delivery of power in existing distribution network. Switching over to three

phase HVDS maintains better voltage profiles and reliability of supply to the consumers. In

HVDS, power is distributed mainly through high voltage lines. This system employs the

combination of 11KV three-phase and single phase configuration small capacity

distribution transformers (5KVA, 6.3kVA, 10KVA, 16KVA, 25kVA) extending supply to 3 to

5 consumers with least low tension lines, preferably insulated overhead cable system

thereby, reducing losses, overloading and distribution transformer failure and improving

the efficiency of the system. This system selects copper wound transformers with very

less no-load loss in order to provide mechanical stability to winding

02.01 Conversion of LVDS into HVDS

To improve quality of supply and to reduce losses HVDS is recommended. HVDS is

constructed by converting the existing low tension lines to single phase system. 11 KV

lines are extended to as nearer to the loads as possible and erect small size either single

phase transformers or three phase transformers of available capacities with NO or least

LT line.Unavoidable short LT lengths to be covered by insulated wires like ABC (AerialBunched Cables). HVDS can be single phase and one neutral (continuous neutral from

sub-station), two-phase two-wire (rigidly earthed natural system) or three-phase small

rating transformers with three-phase high voltage system. With three phases to neutral

system, a continuous earth wire is required to be drawn from 11KV/0.430kV sub-station

and earth wire is to be earthed at all the poles. The neutral of the distribution transformer

is also earthed on high and low voltage sides. On the secondary side of the transformer,

voltage is 230V. The single phase transformer used can be oil filled or dry type.

02.02 Benefits with HVDS

The registered customers feel ownership not allowing others to meddle with low

tension network. Thus, the chances of running unauthorised hooking of loads will be

prevented due to short and insulated low tension lines minimising pilferage and

improving quality of supply. Due to reduction in KVA capacity, voltage drop on low voltage lines is negligible

thereby, improving voltage profile.

The excellent voltage will reduce installation of automatic voltage regulators & thus will

minimize fluctuations in voltages.

In the event of any fault, only limited no. of customers will be affected increasing the

reliability of the system.

Less space is required for transformer installation and routing of HT

transmission line


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Failure of distribution transformer will be eliminated due to the short length low tension

lines and use of aerial bunched cables.

In case of damage of unit, failed unit can be replaced quickly and it will be easy to

erect and transport too.

Meter tampering becomes very difficult

High quality of power supply earns total consumer satisfaction.

Smaller size conductors can be employed and accidents due to touching of snapped

conductors reduced as the breaker trips at substation

Capacities of single phase units can be selected to avoid the laying of low tension

lines because these units are available in ratings from 5 KVA to 25 KVA. Also, single

phase loads will not contribute to the high unbalances so they can be connected on

individual transformers dividing them.

Unauthorized connections get totally eliminated in HVDS & Consumers become

accountable and responsible. The enclosed Figure 1 gives elementary idea of how

HVDS eliminates unauthorized connection in such system as compared to LVDS.

Thus by implementing HVDS, a continuous watch can be kept on the reduction in input

units and the amount of energy saved in terms of money thus, the billing and collection

efficiency increases and the problem of frequent failure of power due to failure of

distribution transformer will be reduced considerably.

02.03 HVDS Implemented in Areas

HVDS in Kashmir region has been implemented in 90 Feet road Soura of Electric Division

IV, of Hawal Sub-division where high voltage line is extended to the load point and

supply is tapped off thru three-phase or single phase HVDS transformers. Under this low

tension lines were completely replaced by way of installing 28Nos of single phase HVDS

units & One No. 25kVA HVDS unit. These all measures were adopted only to improve the

viability of the distribution system.

H.V.D.S.besides can be implemented straight away in places where new constructions

are emerging & thus those areas can be electrified in view of its technical superiority.

03.00 ELECTRIC POWER INSTALLED CAPACITY, ITS AVAILABILITY &

CONSUMPTION


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The total energy input for the financial year 2012-13 for sub-division has been viewed to

be 1865.81 & as such seem to be having an increasing trend . The increasing trend in

energy consumption can be attributed to various factors like increase of connected load &

consequent maximum demand & not but the least unauthorized use of electric power by

consumers remaining unaccounted because of easy access to LT network & thus

resorting to illegal pilferage of power & loss in revenue thereafter.

The Electric sub-division Hawal looks after HT/LT network of all feeders emanating from 8

receiving stations enlisted below:

S.NO RECEIVING STATION NO. OF FEEDERS

01 SOURA (2X10 + 6.3) 05

02 BAGWANPORA (2X10) 03

03 BAMK(3X6.3) 0504 ELLAHIBAGH (2X6.3) 02

05 OWNTABAWAN (2X6.3) 02

06 LAL BAZAR (10 + 5) 03

07 ZOONIMER (1X6.3) 01

08 MUGHAL MASJID (2X10)06(ONLY 2 FEEDERS

PERTAINING TO HAWAL)

The sub-division has a consumer base of total consumer base of 20,887 of various

categories, domestic, commercial, State/Central, Industrial, Bulk etc. The numbers of total

domestic consumers are 17,786 who are provided power supply mostly thru LT network

from local distribution transformers. However, after detailed survey was conducted in

Jurisdiction of Hawal sub-division it was decided that a pilot project in form of HVDS be

selected to reduce Transmission & commercial losses to a certain level. The area

selected for implementation of HVDS was 90 feet road Soura. 28Nos. of 16kVA HVDS

units, on single pole structures with 2-phase 11kV HT supply transforming into 230V that

is directly provided to consumers thru 20sq. mm twin core cable. The meter box fixed to

same pole houses 3 Nos. of single phase meters is sealed from outside. After success of

this project it is proposed that the scheme be extended further for achieving desired

objectives. The objective of less distribution losses due to less LT conductor

length and lower current on the HT side was achieved.


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figure showing HVDS implementation in 90 Feet Road


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04.00 IMPLEMENTATION STRATEGY

The total No. of Installations to be covered in the said scheme is 432. Keeping a provision

of 4 kW/consumer including load growth, it has been proposed to install 111 No.s of 25

kVA Capacity, 3-Phase 11KV/230V Copper Wound HVDS Units. These units will be

mounted on frame of 9m long SP-33 Steel Tubular Poles, along with 6X1 Panel type

meter boxes fitted with suitable accessories like MCBs, Single Phase Digital Energy

Meters etc. The consumer shall be provided with 20 mm Twin core PVC Flat Aluminum

Cable as service line. The areas proposed for implementation of HVDS scheme are listed

in Chapter 07.00.

The existing HT line (Feeder 5) emanating from receiving station Soura is proposed to

be extended further along 90 feet road Soura. The feeder terminates on road at Lane No

06 of Iqbal Colony Soura that besides marks end of existing HVDS. It is proposed to

extend feeder further for lanes & by lanes on existing areas were complete

implementation of HVDS was missed in earlier phase. Complete details are reproduced

below 06.01. LT lines existent in said areas from various distribution transformers

tabulated below will after implementation of this scheme get completely eliminated. It is

proposed 0.05ACSR conductor will be utilized for HT lines on main roads while ABC

Cables of various sizes terminated thru heat shrinkable termination kits will be used in

lanes & by lanes. The conductor formation & clearance of 11kV lines will be maintained as

per the standard enclosed in figures A-16 & A-13. Suspension of ABC cables in lanes &

by lanes is proposed to be as per figure 2(a) enclosed here in list of drawings. Complete

details of earthing arrangement of sub-stations & HT poles are enclosed here in figure F-

10 & F-12. 11kV link sets on HT frame are to be incorporated along various sections to

isolate those areas on occurrence of faults & to facilitate charging of rest of feeder.

Given the volume of investment, a phased approach is to be adopted to cover the entire

population under HVDS. To begin with, defaulting consumers and pilfer prone pockets

are identified and connected load of each load block comprising such errant consumers

worked out. Priority of implementation of HVDS is first given to upcoming areas wherenew construction along with installation with huge load blocks is observed. Losses

attributable to pilferage will reduce significantly, thereby making the investments

productive, while voltage conditions improved, thereby arresting damage of transformers.

More significantly, compelling circumstances created for unauthorized consumers to

regularize their supply, as the HV lines will be out of bounds for dishonest abstraction of

electricity. Elimination of pilferage will lead to virtual nullification of the peak power loss,

thereby freeing up capacity to serve regular loads. Concurrently, consumer accountability

will increase, resulting in moral ownership of the transformer dedicated to a group ofconsumers. The illustration is depicted in fig-1 enclosed here.


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Table: Abstract of Implementation (Sub-div hawal)

S.No Particulars No.

1. No. of Installations 432

2. No. of HVDS Units 111

3. No of Consumers per HVDS Unit 4

4. No. of 1-Phase Digital KWh Meters 432

5. Average Load per Consumer (kW) 6

Table: Abstract of Implementation (Sub-div Rainawari)

S.No

Particulars No.

1. No. of Installations 275

2. No. of HVDS Units 69

3. No of Consumers per HVDS Unit 4

4. No. of 1-Phase Digital KWh Meters 275

5. Average Load per Consumer (kW) 6


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05.00 BRIEF DESCRIPTION OF WORK AND ELECTRICAL SYSTEM DESIGN

CRITERIA

05.01 The prevailing practice of HVDS in Kashmir Valley is to use a single conductor or

two conductors for HVDS transformer. The other terminal of LT winding of the single-

phase transformer is grounded locally. This connection is nothing but Single Wire Earth

Return System (SWER). An elementary idea of SWER system is enclosed here in figure

title SWER System. REC has recently issued Standard Technical Specification

(Specification No. 75/2005) for 5kVA HVDS Transformers, wherein it has been made clear

that in case of single phase 11/sqrt (3) HVDS transformers, 3 ph., 4 Wire system at 11kV

(with separate neutral wire running continuously from 33/11kV sub-station) shall be

adopted and proper earthling of neutral wire separately at both ends shall be ensured. In

view of this following guideline for construction of HVDS substations have been issued:

The standard rating of HVDS transformers shall be 5, 6.3, 10 & 16kVA for 11/3

(Phase to Neutral) transformers and 10 & 16kVA for 11kV (Phase to Phase)

transformers. (REC Specification no. 50/1987 & 75/2005)

5kVA transformers will be of great help in feeding small habitations were small loads

are to be supplied in rural areas. Also 5kVA transformers can be used as a dedicated

transformer for every consumer in urban area. (Foreword to REC Specification no.

75/2005)

The 3 phase and 2 phase HVDS transformers shall be fed from 3 wire 11kV system inconventional manner. However in case of single phase HVDS transformers (11/3 kV

primary), 3 Ph, 4 wire system at 11kV with separate neutral wire running continuously

from 33/11kV sub-station shall be adopted and proper earthling of neutral wire

separately at both ends shall be ensured. (REC Specification no. 50/1987 & 75/2005)

The transformers shall be mounted on single poles. The neutral wire shall be of

minimum size ACSR/AAAC recommended for 11kV by REC (eg ACSR 7/2.11mm,

20mm2 aluminum area)( REC Specification no. 1/1970 revised 1993)

The neutral shall be run on LT shackle insulators installed on 11kV pole directly

through D-clamps. The point of attachment of neutral wire shall be 800mm

below lowermost 11kV phase conductors.( REC Specification no. A-16)

The single phase HVDS transformers shall be distributed equally on the 3

phases of 11kV system to ensure balancing of load at 33/11kV substation

feeding the single phase HVDS system


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06.00 PROPOSED OVERALL SYSTEM PREVIEW

06.01 The following areas have thereby been selected for HVDS implementation:A) Name of Existing Distribution transformer & Feeder :: 400kVA 90 Feet Road

(F3 of R/s Soura)

S.No

.

Areas to be electrified in

proposed HVDS scheme

No. of HVDS (25kVA)

units selected

Total No. of consumers

on proposed HVDS

01 90 Feet road near Chinar 02Nos.7 consumers & a 3-phase

installation

02Towards Owntabawan

prior to Chinar Tree01Nos. 04 consumers

03 90 Feet road near shops 03Nos. 10 consumers

04 Prior to Abu bakr Lane 01No. 05 consumers

B) Name of Existing Distribution transformer & Feeder :: 400kVA Azad Colony

(F1 of R/s Ellahibagh)

S.No

.



No. of HVDS

(25kVA) units

selected


on proposed HVDS

01 Iqbal colony lane no. 02 04Nos. 16 consumers

02Iqbal colony lane no. 03 05Nos. 17 consumers.

03 Iqbal colony lane no. 05 05Nos. 17 consumers.

04 Iqbal colony lane no. 06 03No. 12 consumers

05 Shah faisal colony lane no. 01 03Nos. 10 consumers

06 Shah faisal colony lane no. 02 05Nos. 20 consumers

C) Name of Existing Distribution transformer & Feeder :: 630kVA Housing

Colony (F1 of R/s Ellahibagh)

S.No

.



No. of HVDS

(25kVA) units

selected


on proposed HVDS

01 Along Road on 90 Feet road 04 Nos. 15 consumers

02 Towards Housing Colony 02 Nos. 08 consumers.

03 Adjacent to govt. Park 06 Nos. 22 consumers.

04 Adjacent PHE pump 02No. 06 consumers


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05Adjacent to 630kVA Housing

Colony08Nos. 30 consumers

06Ahead of 630kVA Housing

Colony04 Nos. 16 consumers

07Prior to 400kVA Housing

colony07Nos 28 consumers

08 Other side of park 02Nos 08 Consumers

D) Name of Existing Distribution transformer & Feeder :: 250kVA UsmaniaColony (F1 of R/s Ellahibagh)

S.No

.



No. of HVDS

(25kVA) units

selected


on proposed HVDS

01 Usmania colony lane no. 03 02Nos. 08 Consumers

02 Lane Masjid Aashiya 02Nos. 08 Consumers.

03On road adjacent to existing

250kVA Usmania Colony01Nos. 04 consumers.

04 Usmania Colony Lane - A 09No. 35 consumers

F) Name of Existing Distribution transformer & Feeder :: 630kVA Village (F1 ofR/s Ellahibagh)

S.No.

Areas to be electrified inproposed HVDS scheme

No. of HVDS

(25kVA) unitsselected

Total No. of consumerson proposed HVDS

01 Towards Habbak Grid 11 Nos. 46 Consumers

02 Near Airtel Tower on road 02 Nos. 9 Consumers.

G) Name of Existing Distribution transformer & Feeder :: 250kVA al-NoorColony (F1 of R/s Ellahibagh)

S.No

.



No. of HVDS

(25kVA) unitsselected


on proposed HVDS

01 Near Orange Crche 04Nos. 16 Consumers

02In vicinity of 250kVA Al-

Noor05 Nos. 20 Consumers.

03Houses in vicinity of Open

area09 Nos. 34 consumers.


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Areas to be electrified in proposed HVDS scheme of S/D Rainawari

A) Name of Existing Distribution transformer & Feeder :: 250kVA Sheeshbagh(F3 of R/s Habbak)

S.No

.



No. of HVDS

(25kVA) units

selected


on proposed HVDS

01 Along Lanes & By-lanes 11 Nos. 45 Consumers

B) Name of Existing Distribution transformer & Feeder :: 100kVA Green Colony(F3 of R/s Habbak)

S.No

.



No. of HVDS

(25kVA) units

selected


on proposed HVDS

01 Along Lanes & By-lanes 6 Nos. 24 consumers

C) Name of Existing Distribution transformer & Feeder :: 250kVA AkhzarAvenue (F3 of R/s Habbak)

S.No

.



No. of HVDS

(25kVA) units

selected


on proposed HVDS


D) Name of Existing Distribution transformer & Feeder :: 250kVA Burzubagh (F3

of R/s Habbak)

S.No

.



No. of HVDS

(25kVA) units

selected


on proposed HVDS


E) Name of Existing Distribution transformer & Feeder :: 250kVA MadinaColony (F3 of R/s Habbak)

S.No

.



No. of HVDS

(25kVA) units

selected


on proposed HVDS


F) Name of Existing Distribution transformer & Feeder :: 400kVA Rangpora (F3of R/s Habbak)

S.No

.



No. of HVDS

(25kVA) units

selected


on proposed HVDS



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07.00 TECHNICAL DESCRIPTION

Based on the preliminary field survey conducted & above discussed

considerations following are the list of materials along with their brief technical

specifications:

07.01 Aerial Bunched Cable

Aerial Bunched Cable (11 KV) weather proof of Sizes 3X120sq.mm. 3x95sq.mm,

3x70sq.mm, 3x50sq.mm, 3x35sq.mm can be used for 11kV HT tap lines,

proposed for lanes & by lanes where HVDS is proposed.

07.02 Outdoor type Distribution Transformers

The standard proposed ratings of transformers utilised can be 10, 16, 25kVA. Oil

Immersed naturally cooled 3 phase 11 kV/433 - 250 V distribution transformers for

outdoor use pole mounted.

07.03 Cable Boxes

The transformer shall be fitted with suitable LV cable box having non-magnetic

material gland plate with appropriate sized single compression brass glands on LV

side for cable termination.

07.04 FITTINGS

The following standard fittings shall be provided:

Rating and terminal marking plates, non-detachable.

Earthing terminals with lugs

Lifting lugs for main tank and top cover

Terminal connectors on the HV/LV bushings {for bare terminations only}.

Thermometer pocket with cap.

Air release device

HV bushings - 3 Nos.

LV bushings - 4 Nos.

Pulling lugs

Radiators - No. and length to be mentioned (as per heat dissipation

calculations)

Lightning arrestors on HT side - 3 No.

Prismatic level gauge. Drain cum sampling valve.


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Top filter valve

Oil filling hole and drain plug on the conservator.

Silica gel breather

Base channel 75x40 mm

Pressure relief device or explosion vent.

7.5 Steel tubular poles for overhead power lines

Steel Tubular stepped type/swaged type poles for overhead power lines

confirming to IS: 2713 of 1980 are proposed. Pole shall be provided with earthing

arrangements. A though hole of 14 mm diameter be provided in each pole at a

height of 300 mm above the planting depth. The pole shall be quoted with black

bituminous paint confirming to IS: 158 of 1968 read with latest amendments

throughout, internally and externally upto level which goes inside the earth. The

Remaining portion of the exterior shall be painted one coat or red- oxide primer as

specified in IS; 2074 of 1979 read with latest amendments

Designation as per IS: 2713 Part II

1. 410-SP-56 11 Mtrs. Long S.T. pole.

2. 410-SP-33 9.0 Mtr. Long ST Pole.

7.6 11 KV D.O. fuse unit (one set of 3 nos.)

The D.O. Fuses are intended for use on transformers for protection/isolation of the

same during overload or fault conditions. the drop out fuse shall conform to IS:

9385 (Part- I) to III) as amended from time to time. The drops out fuses are

required with Post Insulators. These shall be suitable for mounting on the

structure. The bracket/channel hardware for DO Fuses shall be provided with

adequate sizes of nuts, bolts and washer for mounting on the structures. The rated

voltage shall be 11KV for 11KV DO Fuses. The rated lightning impulse withstandsvoltage both for positive and negative polarities shall be as given below:

To earth and between poles 1015KV Peak

Across the isolating distance of fuse base 85KV Peak

RATED ONE MINUTE POWER FREQUENCY WITHSTAND VOLTAGE (DRY

AND WET) VALUES FOR THE FUSE BASE

a) To earth and between poles : 28KV Peak

b) Across the isolating distance of fuse base : 32KV PeakThe rated breaking capacity shall be 8KA (A symmetrical).


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7.7 11 KV A.B. Switch (G O Switch).

The 11KV AB switches shall conform to IS: 9920 (Part-I to IV). The 11KV Air

Break Switches are required with two poles in each phase. The AB Switches shallbe with phase coupling shaft, operating rod and operating handle. It shall be

manually gang operated and vertically break and horizontal mounting type. a

normal current rating of 400 Amps and for continuous service at the system

voltage specified as under:

11 KV AB Switch : 11KV + 10% continuous 50 C/s solidly grounded earthed

neutral system

The complete set of three phase AB Switches shall have stacks of post

insulators. 11KV AB Switches : 3 No. 11KV Post Insulator per stack

7.8 11 KV Gapless Lightening Arrestors (Station Type &

Line Type).

Single phase outdoor metal oxide type gapless surge arresters for use in

effectively earthed system with the transformer neutral effectively earthed with

normal voltage of 11KV for 9KV Lightning arrestors. The rated voltage of Arrestors

shall be 9KV (rms) for 11KV system. Current impulse withstand level The 9 KV

arrestors shall withstand 18 impulse of long duration current with a peak level of

75 Amp & duration 1000 micro secs. 30KV arrestors shall meet the duty

prescribed in line discharge Class-I of IEC TC-37. The arrestor for 11KV system to

be provided with a suitable disconnecting device. This shall be connected in series

with the ground lead and should not affect the sealing system of the arrestor. The

disconnecting device shall conform to the requirement specified in IS:3070 (Part-II)

1993 & IEC 99-4 (1991-II) clause 5.12, 7.6.3.


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08.00 COST ESTIMATION

The detailed quantities of various works to be executed under the scheme have

been worked out based on preliminary field survey and above discussed

considerations details of which are enclosed. A tentative cost estimate has been

prepared for the scheme mainly on the basis of cost data available in Electric

Division-IV, Khanyar. The detailed cost estimate is enclosed herewith.

Annexure A: Estimate for HVDS Units.

Tentative Estimate for Design, Supply, Testing & Commissioning of 25 KVA 11 KV/240VHVDS Units in 90 feet Road & Ellahibagh

S.NoParticular (Supply ,erection ,testing &

commissioning of following items)Unit Qty

Rate/Unit Rate/Unit

(Rs) (Rs)

1

Supply, Erection, Testing & Commissioningof 9 Mtr Long Steel Tublar YST 240 of 155-1161 of design as per IS-2713, 410 SP33as per IS-2713.

No 412 9500.00 3914000.00

2

Digging of pit disposal of earth andproviding and laying of cement concretingin1:2:4 ratio for bottoming of pole structure

1' above 6" from below pole base uptoground level &1 around the pole in M-15mix pole upto ground level)

Job 206 1500.00 309000.00

3

Providing, Erection, Fixing, Testing &Commissioning of MS Channel Iron75x40x40x6' long (206 No.) duly fabricatedas per site requirement and painted withtwo coats of Red oxide and Al. Paint.

Kg 2682.12 60.00 160927.20

4

Providing, Erection, Fixing, Testing &Commissioning of MS Angle Iron 50x50x6'long (206 No.) duly fabricated as per siterequirement and painted with two coats of

Red oxide and Al. Paint.

Kg 3386.64 60.00 203198.40

5Providing & Fixing of 11 KV Pin Insulatorswith pins

No 412 90.00 37080.00

6Providing & Fixing of GI Earthing Strip 25x3mm.

Kg 2060 80.00 164800.00

7Providing & Fixing of pipe earthing /Rodearthing complete as per REC standard

Kg 206 1500.00 309000.00

8Structure painting & fluorscent displaywriting of poles

No 206 100.00 20600.00

9 Providing & Fixing of Earthing Boots. No 2556 50.00 127800.00

10

Providing & Fixing of PG clamps for making

connections at take off points. No 206 40.00 8240.00


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11Providing & Fixing of Guys along with guyinsulators, Guy rods with turn bucklescomplete.

No 20 1500.00 30000.00

12Providing & Fixing of MS Channel iron75x50x50x6 mm 9 long for transformer dulyfabricated & welded with pole.

kg 24139.1 60.00 1448344.80

13 Providing & Fixing of lighting arrestor set Set 206 1800.00 370800.00

14 Providing & Fixing of Drop out fuse set No 206 1200.00 247200.00

15 Providing & Fixing of G.O.S No 206 3800.00 782800.00

16

Providing, Erection, Mounting, Poistioning,Testing & Commissioning includingscaffolding sets of 25 KVA 11 KV/240Copper wound HVDS transformer.

No 206 20000.00 4120000.00

17Providing, Laying, Fixing & ConnectingService line 50 mm single core Al.cable

Km 3 52000.00 156000.00

18 Providing & Fixing Meter Box (Panel Type6x1 Meters) with Bus Bars etc.complete No 206 4200.00 865200.00

19Providing, Laying, Fixing & ConnectingService line of 10 mm Twin core Al. flatcable.

Km 12 15000.00 180000.00

20 Providing & Fixing of Anti Climbing device No 206 100.00 20600.00

21 Providing & Fixing of Danger plate No 206 50.00 10300.00

22Providing & Fixing of 40/63 Amp MCB DP(ISI Mark)

No 206 250.00 51500.00

23 Earthing of Poles & Substation Complete. Job 206 3500.00 721000.00

24 Providing & Fixing of Sundry Nuts, Bolts,Washers, etc,. Kg 500 80.00 40000.00

25Providing & fixing of MS Angle Iron braces(50x50x6mm 10m long) duly fabricated.

Kg 283.889 60.00 17033.32

Total 14315423.72


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Annexure B: Estimate for HT Tap Line for HVDS Units.

Tentative Estimate for Supply, Erection, Testing & Commissioning of 11KV HT Linefor 25 KVA 11 KV/240V HVDS Units in Ellahibagh & 90 Feet Road Soura

Part (A)

S.No.Particular (Supply, Erection, testing &

commissioning of following items)Qty. Unit

Rate/uni

tAmount

1

Providing, Erection, Testing &Commissioning of 9mts Steel Tubularpoles SP-33 complete with base plateand top cap including fabrication of polesite requirement, loading, un-loading,dragging, carriage upto working site asper IS Standard.

60 Job 14300.00 858000.00

2

Digging of pit disposal of earth andproviding and laying of cement

concreting in1:2:4 ratio for bottoming ofpole structure 1' above 6" from belowpole base upto ground level &1 aroundthe pole in M-15 mix pole upto groundlevel)

60 Job 1700.00 102000.00

3

Providing, Erection, fixing, testing &commissioning of MS Channel Iron75x40x40x6' long (40 No.) for fabricatingV-Cross as per site requirement andpainted with two coats of Red oxide andAl. Paint.

400 Kg 74.00 29600.00

4Providing & Fixing of U-Clamps for fixingof Pin insulators of flat iron 35x4 mm.

160 kg 74.00 11840.00

5 ABC Cable of Sizes 70/50/35 sq.mm 15 kms 9000.00 135000.00

6 11KV Pins along with Pin insulators. 180 No. 165.00 29700.00

7Providing, Fixing, Testing &Commissioning of earthing rods

60 No 480.00 28800.00

8

Providing, Fixing, Testing &Commissioning of Nuts & Bolts /washers(Galvanized of sorts)

165 Kg 92.00 15180.00

9Providing, Fixing, Testing &Commissioning of GI Wire for earthing.

150 Kg 90.00 13500.00

10

Providing, Erection, Testing &

commissioning of ACSR 0.05 conductor(Rabbit) Conductor as per latest ISStandard, including loading, un-loading,carriage upto working site.

7.20 Km 38000.00 273600.00

11Painting of poles/structure with 2 coats ofAl. & red oxide paint.

60 Job 300.00 18000.00

12 Earthing of Poles Complete. 60 Job 1750.00 105000.00

13

Providing & Fixing of Guys along withguy insulators, Guy rods with turnbuckles complete.

20 No. 1500.00 30000.00

Tota

l1650220.0

0


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Annexure C: Estimate Single Phase Digital Energy Meters for HVDS Units.

Tentative Estimate for Supply, Erection, Testing & Commissioning of Single

Phase LT Digital Energy Meters for HVDS at University Campus, Hazratbal.

S.No.Particular (Supply, Erection, testing &

commissioning of following items)Qty. Unit

Rate/unit

(Rs.)

Amount

(Rs.)

1

Supply, Erection, Testing &

Commissioning of Single Phase,

AC, 2-Wire LT Digital Energy

Meters 240V, 50Hz, CI.1.0, kWh of

SPEM 01 Type as per IS:13779

standard along with 4 No.'sTamper proof Departmental Seals

and other accessories like Conduit,

Binding Wire, Aluminum Lugs,

PVC Tape etc. for LT Connections.

264 No.'s 1500.00 396000.00

Total: 396000.00

Table: Abstract of Total cost.

S.No Particulars Amount (Rs.)

1 On Account of 25 kVA HVDS Units.11722418.92

2 On Account of HT Tap Line for HVDS Units.1650220.00

3 On Account of 1-Phase Digital kWh Meters648000.00

Total:14020639

This is however only a tentative cost of the scheme based on preliminary data

which may vary during actual execution of the scheme.


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09.00 APPLICABLE STANDARD:-

All the cables shall conform to the requirements of following standards with latest

Amendments, if any

S.No. IS Code Description

IS:7098(Part-2) 1985 with

latest amendments

Cross linked Polyethylene insulated Sheathed

Cables for working voltage from 3.3 KV up to and

including 33KV

IS:8130-1984Specification for conductors for Insulated electriccables

. IS:5831-1984Specification for PVC Insulation and sheath of

electric cables.

IS: 3975-1979

Specification for mild steel wires, strips and taps for

Armouring cables.

IS:10810-1984 Methods of test for cables.

IS:4905-1968 Methods for random sampling

IS:10418-1982 Wooden drum for electric cables

IS-7098 XLPE Cable

IS- 10810/1984 Methods of test for cables.

IS 8130/1984 Conductors for insulated cables

IS 10418/1982 Drums for electric cables

IS- 5831-1984Specification for PVC Insulation and sheath ofelectric cables.

IS-335 Specification for Transformer Oil

IS-5 Specification for colors for ready mixed paints

IS-104 Ready mixed paint. brushing zinc chromate, priming

IS-2099 Specification for high voltage porcelain bushing

IS-649Testing for steel sheets and strips and magneticcircuits

IS-457 Dimensions for clamping arrangements for bushingsIS-7421 Specification for Low Voltage bushings

IS-.347 Specification for Outdoor Bushings

IS-5484 Specification for Al Wire rods

IS-9335 Specification for Insulating Kraft Paper

IS-6600 Guide for loading of oil Immersed Transformers

I S-2362Determination of water content in 011 for porcelainbushing of transformer

IS-6162 Paper covered aluminum conductor

IS-6160Rectangular Electrical conductor for electricalmachines


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IS-5561 Electrical power connector

IS-6103Testing of specific resistance of electrical insulatingliquids

IS-6262Method of test for power factor and dielectricConstant of electrical insulating liquids

IS-6792 Determination of electrical strength of insulating oil

IS-10028 Installation and maintenance of transformers.

10.0 Conclusion


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The HVDS scheme has generated a learning curve, leading to formulation of a

new strategy of energy conservation and demand curtailment. This novel

approach is being pursued so as to reduce energy wastage and optimize the

power intake. Initial results indicate that the energy saving can be as much as

70%, even without reengineering of the suction and delivery system. Because of

reduced consumption, the consumers benefits by reducing his monthly

expenditure on electricity. An important corollary is that consumers support the

process and respond spontaneously to the change, which produces long term

gains to them and the utility.

dpr for hvds at ellahibagh_final

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