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A PRESENTATION ON BIHAR SUB TRANSMISSION, APDRP & RE PROJECTS ER-I, STS, PATNA PowerPoint PPT Presentation


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A PRESENTATION ON BIHAR SUB TRANSMISSION, APDRP & RE PROJECTS ER-I, STS, PATNA. FUND KA FUNDA. Sub-Transmission @ 15% ( Rs 421/- Cr.) Rs.552+1005+1240= Rs.2809 Cr. APDRP @15% Rs 1040/-Cr. ( Rs 156 /- Cr.)

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A PRESENTATION ON BIHAR SUB TRANSMISSION, APDRP & RE PROJECTS ER-I, STS, PATNA

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A PRESENTATION ON

BIHAR SUB TRANSMISSION, APDRP & RE PROJECTS

ER-I, STS, PATNA


Fund ka funda l.jpg

FUND KA FUNDA

  • Sub-Transmission @ 15% ( Rs 421/- Cr.)

    Rs.552+1005+1240= Rs.2809 Cr.

  • APDRP @15% Rs 1040/-Cr. ( Rs 156 /- Cr.)

  • V-M RE work @8% Rs. 103/-Cr. ( Rs8/- Cr.)

  • RGGVY work @12% Rs 1995 Cr. ( Rs 239/- Cr.)

  • RGGVY 2nd phase @9% Rs. 3000 Cr. ( Rs 270/- Cr.)

    Total ( Rs 1094/- Cr.)


Financial vaibility l.jpg

FINANCIAL VAIBILITY

  • Average cost of supply (ACS)

  • Average cost of revenue realization (ARR)

  • Difference in average cost

  • Input energy quantity

  • Profit/Loss=Quantity X Difference in average cost Average Cost of input Energy


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Actual Photographs of Site


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Actual Photographs of Site


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Actual Photographs of Site


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Actual Photographs of Site


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Actual Photographs of Site


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Actual Photographs of Site


Overview of the proposed system l.jpg

Overview of the Proposed System


Schematic of dt connection l.jpg

TPMO

TPMO

11 kV LA

11 kV LA

11 kV LA

DO

Fuse

DO

Fuse

DO

Fuse

Lock

Lock

Dist.

Boxx

Lock

Lock

Lock

Lock

3 Phase, 16 kVA

Transformer

1 Phase, 16, 25 kVA

Transformer

3 Phase, 40, 25 kVA

Transformer

MCCB

Power Grid Corporation of India

HVDS RURAL ELECTRICAL SCHEME

Basic D. T. Connection Scheme

Re- wirable H and Guard Fuse

Schematic of DT Connection


Schematic of service connecton l.jpg

No Direct

Service

Connection

From Line

For Bare Line WEDGE

type Connector and

Fir ABC PG Grooved

type Clamp of Al Alloy

Pole mounted

Dist Box

Box location/ height to ensure safe

Working on box with live Line.

GI Wire and service Wire

( To Run Horizontally by

Adjusting GI pipe Length

Suitable

Clamp to be

Provided by

contractor

Leave at least

two spare

GI Wire and service Wire

( To Run Horizontally by

Adjusting GI pipe Length

G I Pipe

.3 x .3 x 1.0 M Brick messonary

Multi

story

Building

Mud House

/Hut

.3 x .3 x 1.0 M Brick messonary

Pukka House

One meter

in ground

Schematic of Service Connecton


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POWER

SUB-STATION


Design concepts of 33 11kv new substation l.jpg

DESIGN CONCEPTS OF 33/11kV NEW SUBSTATION


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Planning the Layout

  • Should be economical

  • Ease of operation and maintenance

  • Safety of operating professional


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Substation Equipments

  • Structures

  • Power transformers

  • Circuit Breakers

  • H.T. Fuses

  • Isolating Switches

  • Bus bar Arrangement

  • Insulators

  • Lightning Protection equipments-LAs


Cont d l.jpg

Cont’d

  • Instrument transformers -Current and Voltage transformers for –

    (i) Protection System

    (ii)Metering system

  • CONTROL Panels with Various types of relays and instruments

  • Control room

  • Cables-

  • Power cables

  • Control cables


Cont d18 l.jpg

Cont’d

  • Batteries for D.C. supply

  • Station transformer

  • Fencing / boundary wall, approach road, security hut etc.

  • Earthing system

    Facilities:

    (i) Lighting

    (ii) Fire-fighting equipment

    (iii) Staff quarters


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Structures

  • Incoming – outgoing gantries

  • Mounting structures for Power Transformers, Station Transformers, breakers, isolators, HT fuses, insulator supports ( For Post Insulators), C.Ts & P.Ts.

  • Bus-bar structures to provide entry from the overhead line to the s/s and to extend required number of feeders (Bays). Similarly other structures required to mount the operating and other accessories. Minimum clearance from ground level and from any live part is to be maintained as per I.E. Rules.


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continue

  • Structure are fabricated from steel sections or rail and joist are used. P.C.C. poles cast in reduced length (up to 7 meters) with strength of 400kg are also being used for economy purposes.


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Power transformers

  • Power Transformers with different capacities are -

    (i) 630kVA33/11 step-down(Delta/Dy11)

    (ii)1600kVA

    (iii)3150kVA

    (iv)5000kVA

    Most of the Transformers are provided with off-circuit tap Changers.However On Load Tap Changers are being provided in the Power Transformers with capacity of more than 5MVA


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Protecting Devices

A Circuit Breakers

  • (i) 33kV

  • Oil type circuit breakers. Now being replaced with vaccum/SF6 circuit breakers

  • Normal current - 630Amps voltage 36kV

  • Rated short circuit current 25 kA for 3 Sec

  • Metering and protection panel gets signals through 11kV/110V PTs and CTs which are provided with separate cores for metering and protection System.


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Cont’d

(ii) 11kV

  • Oil type circuit Breakers- Now being replaced with SF6 or Vacuum Circuit Breakers

  • Normal current-400Amps and 800Amps

  • Short circuit current-25kA for 3Secs


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Continue

  • Breaker panel is provided with motor operated spring charging mechanism which operates at 230V single phase AC supply.

  • Circuit breakers for Transformers of more than 5MVA capacity are being provided. For lower capacity Transformers protection through HG fuses, on 33kV side are provided.

  • Outdoor type CTs and PTs are provided for 33kV system.

  • CTs and PTs are supplied with 11kV breaker Panel


Ht fuse l.jpg

HT Fuse

  • Normally drop out fuse cut outs for current rating of upto100Amps are being used. Fuses have insulated base / fitting arrangements with creep-age distance to earth not less than 320mm


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Isolating Switches

Isolating Switches

-Switches are Used to isolate equipment for maintenance purposes

  • 33kV:

  • For 33kV system horizontal type isolating switches are used. Rated normal current - 630A at 36kV.

  • 11kV:

  • Two type IS Are being used

  • (i) suitable for horizontal mounting

  • (ii)suitable for vertical mounting ating

  • Normal rating- 400amps- At 12kV


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Bus Bars

Two types of bus bars - Rigid and Strain type

  • In rigid type- Pipes are used for bus-bar and also for making connections. These are supported on bus post insulators and requires large space.As the bus bars are rigid the clearance remain constant.

  • Minimum ground clearance 3660mm from ground for 33kV system.

  • The strain type Bus bars are over head system of wires betn. two supporting structures.

  • Material-ACSR Racoon for 33kV and 11kV bus-bars


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Cont’d

  • 33kV&11kV outgoing and incoming feeders kept at 6400mm for ground clearance. The other levels of live point in the s/s area are at different heights but a minimum of 3660mm is to be maintained.

  • 11kV jumpers are kept at 4500mm height for ground clearance.


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SINGLE BUS ARRANGEMENT-A

PT

PT

ISO

ISO

CB

CB

CT

CT

BC

33 KV BUS

ISO

CB

ISO

X-mer

ISO

ISO

CB

ISO

X-mer

ISO

BC

11 KV BUS

CB CB

ISO ISO

ISO

CB CB

ISO ISO

ISO


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SINGLE BUS ARRANGEMENT-B

CB

CB

ISO

ISO

BC

ISO

ISO

CB

CB

ISO

ISO

ISO

ISO

BC

CB

CB

CB

CB

ISO

ISO

ISO

ISO


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DOUBLE BUS ARRANGEMENT

BC

33 KV

MAIN BUS

TRANSFER BUS

33 KV

BC

ISO ISO ISO ISO ISO ISO ISO ISO

CB

CB

CB

CB

ISO

ISO

ISO

ISO

CT

CT

ISO

ISO

ISO

ISO

BC

11 KV BUS

33KV OUTGOING LINE

INCOMINIG LINE

CB

CB

CB

CB

PT

ISO

ISO

ISO

ISO

ISO

ISO


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Insulators

Adequate insulation is required for reliability of supply, safety of personnel and equipment etc.

  • Number of insulators is kept minimum for aconomy reasons at the same time ensuring reliability and security of supply.

  • Special insulator with higher leakage resistance to be used, where problem of insulator pollution is expected


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Lightning protection

  • Metal oxide lightning arresters are used as they have gapless construction and respond to over-voltage without any time delay. They have longer life and higher energy handling capacity.

  • Rated voltage 30kV for use on 33kV system and 9kV for use on 11kV. Nominal discharge current rating 10 & 5kA


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Instrument Transformers

Current Tranformers are required for protection & metering system

  • Standard ratings for 33/11kV S/S are

  • 300-150/5-5 or 5-5-1 Amps.

  • 200-100/5-5 Amps.

  • 100-50/5-5 Amps.

  • 50-25/5-5 Amps.

  • Accuracy class for protection - 5P10 and for metering Class 1

  • Oil filled or Resin cast CTs are being used depending upon application


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Cont’d

  • The CTs and PTs can be either Oil filled or resin cast depending upon the application

  • Standard voltage ratio for PTs is 33kV / 110V or 11kV / 110V .


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Control and Relay Panels

C&R Panels normally consist of

  • Ammeter with selector switch

  • Voltmeter with selector switch

  • Energy meter

  • IDMT Relays

  • Differential Relay or REF relay for Transformer protection

  • Various indications and Annunciations


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Control Room

  • While designing control room requirement of space for batteries, battery charger, ADLS, one small store room should also be considered in addition to space for 33kV C&R Panels and 11kV breaker panels along with sitting space for operating staff.


Cables l.jpg

CABLES

  • Care should be taken to segregate Power and control cables on separate racks so that in case of fire in power cables, control cables are not damaged and vice versa.

  • The trenches should be designed for easy entry of cables and properly sloped so as to avoid accumulation of water.

  • If possible segregation of AC and DC cables should also be considered.

  • All cables should be labeled for proper identification and sheath should be earthed .


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Battery and Charger

  • Normally 24/30 Volt, 150 AH lead acid or NICAD Battery banks are used.

  • The Charger should be Single Phase AC operated Float cum Boost type having capacity of 5 Amps boost charging and 200 mA float Charging and should be fully automatic with alarm and indication system.


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Station Transformer

  • Station Transformer with a capacity of 63 or 100kVA capacity is normally sufficient to cater the needs of a 33/11kV substation.

  • However higher capacity station transformer may be considered if supply is considered to be provided to the staff Colony.


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Other Facilities

  • Boundary wall or Fencing

  • Illumination of control room and switch yard

  • Provision of Fire Extinguishers


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Earthing

  • Provision of adequate Earthing in a substation is a must for safety of operating personnel and proper operation of the syetm and protective devices.The primary requirements are –

  • The earthing resistance should be as low as possible preferably less than 1 ohm.


Earthing cont d l.jpg

Earthing - cont’d

  • Provision of earthing for following is made in a substation –

  • Neutral point of each equipment / system such as transformer, capacitor bank, PT etc should have two independent earthings

  • Earthing of equipment enclosures and non current carrying parts

  • All metal frame works such as fencing wire mesh fencing pole illumination pole etc.

  • Lightening arresters should also have two independent earthings.


Earthing cont d44 l.jpg

Earthing – cont’d

  • Factors considered while designing Earthing-

  • Duration of fault

  • Magnitude of fault current

  • Resistivity of underlying strata

  • Resistivity of surface material

  • Material of the earth electrodes


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Minimum Clearances


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Other Parameters


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From all of us

in POWERGRID,

Thank You


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