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

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

  2. 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.)

  3. 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

  4. Actual Photographs of Site

  5. Actual Photographs of Site

  6. Actual Photographs of Site

  7. Actual Photographs of Site

  8. Actual Photographs of Site

  9. Actual Photographs of Site

  10. Overview of the Proposed System

  11. 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

  12. 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

  13. POWER SUB-STATION

  14. DESIGN CONCEPTS OF 33/11kV NEW SUBSTATION

  15. Planning the Layout • Should be economical • Ease of operation and maintenance • Safety of operating professional

  16. Substation Equipments • Structures • Power transformers • Circuit Breakers • H.T. Fuses • Isolating Switches • Bus bar Arrangement • Insulators • Lightning Protection equipments-LAs

  17. 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

  18. 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

  19. 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.

  20. 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.

  21. Power transformers • Power Transformers with different capacities are - (i) 630kVA 33/11 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

  22. 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.

  23. 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

  24. 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

  25. 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

  26. 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

  27. 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

  28. 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.

  29. 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

  30. 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

  31. 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

  32. 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

  33. 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

  34. 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

  35. 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 .

  36. 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

  37. 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.

  38. 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 .

  39. 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.

  40. 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.

  41. Other Facilities • Boundary wall or Fencing • Illumination of control room and switch yard • Provision of Fire Extinguishers

  42. 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.

  43. 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.

  44. 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

  45. Minimum Clearances

  46. Other Parameters

  47. From all of us in POWERGRID, Thank You

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