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industrial training on 132 kv substation

  2. -:ACKNOWLEDGEMENT:- We had a great pleasure in expressing our sincere gratitude to the TPO of our college and Mr. D.Bose, GM(HR & A),W.B.S.E.T.C.L for allowing summer training at Liluah 132/33/25 KV substation. We are greatly thankful to Mr. Rakesh Kundu, assistant engineer of Liluah transmission(O & M) substation for his immense help and suitable guidance during training period. We are also thankful to all other staffs of substation for their day to day help and assistance.
  4. ELECTRICAL BUSBAR ELECTRICAL BUSBAR  It is the collector of electrical energy at one location at constant voltage  Types:- 1. Rigid type: - made up of aluminium alloy tubes of 50 to 250 mm diameter and supported on post insulator with clamps and connector. 2. Flexible type:- made up of A.C.S.R. conductor and supported at both ends by strain insulators clamps and conductors.  Acts as common point when a number of generator or feeder operating at same voltage is to be connected together. TYPES OF ARRANGEMENT 1. Single busbar system 2. Duplicate busbar system 3. Triple busbar system
  5. PROTECTIVE SCHEME IN POWER SYSTEM  The capital investment involved in a power system for the generation, transmission & distribution of electrical power is so great that proper precaution must be taken to ensure that the equipment not only operate as nearly as possible to peak efficient but also that it is protected from accident .  There are two main components of protection scheme: 1. Protective relay. 2. Circuit breakers. 1. Protective relay:- A relay is an automatic device which senses an abnormal condition in an electrical circuit and closes its contacts. There are two operating principle of relay: I. Electromagnetic induction. II. Electromagnetic attraction.
  6. Relays used for line protection : (a) Earth fault relay (b) over current relay (c) distant protection relay (d)Zone protection relay Relays used for transformer protection: (a)Earth fault relay. b) Over current relay. (c) buchholz relay (d)differential relay (e)back up earth fault relay (f)restricted earth fault relay (g)high temp relay (g)high temp relay (h)supervision relay. 2.CIRCUIT BREAKER- • Isolate the faulty part of the power system in case of abnormal condition. •A protective relay detects the abnormal condition & sends a tripping signal to circuit breaker. After receiving that relay trips the circuit and circuit breaker isolates the faulty part •In normal condition, the two contacts(fixed and moving) remain in closed position CLASSIFICATION- 1. Oil circuit breaker 2. Air blast CBs 3. Sulphur hexafluoride CBs 4. Vacuum CBs
  7. PROTECTION AGAINST LIGHTNING The most commonly used devices for protection against lightning surges are: 1. Earthing screen. 2. Overhead ground wires. 3. Lightning arrester or surge diverters.
  8. ISOLATOR  An Isolator is a disconnecting switch being operated under the condition of no load negligible current.  Used for disconnecting the circuit breaker from the circuit and to isolate the electrical circuit at the time of maintenance work and repair.  Interlocking arrangement are generally provided in the isolators. TYPES:- 1. Vertical break type single, double and triple pole insulator 2. Horizontal two rotating post, centre break insulator 3. Horizontal break ,centre rotating double break insulator 4. Extra high voltage column insulator
  9. CAPACITOR BANK These capacitors have an important role to investigate the behavior of the breaker towards the restricting voltage. 1. Controls and improves the voltages. 2. Removes the reactive components of VARS component of the power which is not desirable. 3. Improves power factor. Capacitor s
  10. POWERLINE CARRIER COMMUNICATION (PLCC)  Protection signaling, speech and data transmission for system operation and control, management information system etc. are predominantly met by PLCC .  It is the most economical and reliable method of communication because of higher mechanical strength and insulation of high voltage power-lines which contribute to the increased reliability of communication and lower attenuation over the longer distances involved. PLCC Equipments-a) Wave trap b) Coupling capacitor c) Line Matching Unit(LMU) d) Protective equipments.
  11. BATTERY  Provide unit charge to the entire system & behaves as back-up charging system  In Liluah 132 KV substation these units provide control voltage of 220 VOLT DC back-up of entire system.  Makers- Amra Raja Make  Charging & discharging is needed to keep it healthy. Battery Charger: SL. No. : 4/2008/2 AC Input: 415± 10% Ph: 50 Hz DC Output to charge: 250 V AH:110 A Cells at quick/boost: 2/2.7 A.P.L.: 60 A Trickle/float: 2.15/2.3 V.P.C.: 1602 /480 M
  12. EARTH TRANSFORMER An Earth Transformer is connected in those areas where earth point is not available like a system connected to delta side of electrical power transformer, an artificial neutral point is created using earth transformer.
  13. Specifications Earthing Transformer 1 Earthing Transformer 2 1. Makers name GEC GEC 2. Std IS3151-1982 IS2026-1977 3. KVA Rating 100 100 4. Volts at no load HV:33KV,LV:415V HV:33KV,LV:415V 5. Amperes rating HV:1.75A,LV:139A HV:1.75A,LV:139.3A 6. Phases 3 3 7. Types of Cooling ON AN ON AN 8. Frequency 50 Hz 50 Hz 9. Vector group ZNyn-11 ZNyn-11 10. Impedance volt 4.5077% 3.796% 11. Earth fault current 550 A for 30 sec 287 amp for 30 sec 12. Year of mfg. 1990 1986
  14. TRACTION TRANSFORMER(132KV/25KV)  It is used to supply the Indian Railways. The Railways use 25 KV Single phase line, so the Traction Transformer takes 2 phase 132 V Input supply and gives 2 phase 25 KV Output out of which one phase is grounded and made neutral and other phase is used by the Indian Railways. Serial no. Specifications Traction Transformer 1 & Traction Transformer2 1. Maker’s Name Crompton Greaves Ltd. 2. MVA Rating 12.5/18.75 3. MVA (As per I.S) 13.5/20 4. KV Rating (at no load) H.V=132 KV;L.V=15KV 5. Line Current(Amps) H.V=102/151.5amp;L.V=500/750amp 6. Output Phase Single 7. Frequency(Hz) 50Hz
  15. 8. Type of cooling ON AN/ON AF 9. Total Oil(ltrs/kg) 15300/12900 10. Total Mass(Kg) 47600 11. Untanking Mass Core & winding=18900 kg Bell tank=4200 kg 12. Heaviest Package With oil=33500 kg Without oil=24800 kg 13. Hot Spot temperature Ref<1150C 14. Ambient temperature 45OC 15. Insulation level (H.V./L.V.) LI650AC275/LI250AC95 16. Guaranteed temperature rise of oil(0C) 50 17. Guaranteed temperature rise of winding(0C): 50 18. Maker’s w.o no.: T8174 19. Maker’s sl no.: 24749 20. Customer reference No.: LOI REF PLN/TRACTION/TRANS/491 21. Year of mfg: 06-04-1987
  16. STATION SERVICE TRANSFORMER Station Service Transformer converts HV 33 KV TO LV 400KV which is used by the Substation for its own needs like to run the air conditioner, fans and to run the control panel and relay panel. Specifications-  Maker’s Name: - Transmake Electrical Pvt. Ltd.  STD:- IS2026 & 1180  KVA Rating:-100  Volts at no load:-HV-33KV & LV-400V  Current at no load(A):-HV-1.75 & LV-144.34  Phase:-3  Diagram:- TW/100/33  Sl. No.-94311  Type of cooling:- ON AN
  17. Frequency:- 50 Hz Impedance:- 4.1% Vector Group:- DYn11 Core & Winding weight:- 430 Kg Weight of oil:- 260 Kg Total weight:- 930 Kg Oil quantity:- 300 Ltrs Year Of Mfg:- 12/2002 Guaranteed Max temp. rise in oil:450C
  18. POWER TRANSFORMER-3 NAMEPLATE PARTICULARS:  Maker’s Name: - Bharat Heavy Electricals Ltd.  MVA Rating: - 30/40/50  Vector Symbol: - YnD1  Phase: - 3  Frequency: - 50 Hz  Type of cooling: - ON AN/ON AF/OF AF  Diagram Drg. no:-14561950473  Sl. No.:- 2013511  Year of mfg:- 2001  OLTC With oil, transport with oil heaviest package:- 50 Tonnes  Complete transformer including oil:- 97 Tonnes  Bil: HV:- 550 kvp & LV:-170 kvp  Impedance volts(at 750C):- 12.5 ± 13%  KV(No load):- HV-132 KV & LV-33 KV  Amps:- HV-218.95 & LV-875.81  At taps: normal tap(9b)
  19. POWER TRANSFORMER-4 SPECIFICATION:  Maker’s Name:- ABB  Ref. Std: IS2026  Sl. No.: AAA-003  Year of mfg:- 2008  Frequency:- 50 Hz  Type of cooling:-ON AN/ON AF/OF AF  % Impedance Voltage HV/LV:  Nominal Power(ON AN/ON AF/OF AF):-30/40/50 MVA  Nominal voltage:- HV-132 KV & LV-33 KV  OLTC Type:- EASUNMR  Rated current:- 350 A  Insulation Ground:- 725 KV  Step Voltage:- 953 V  Control Voltage:- 110 V  Variation:- +10% to -10% of HV  No. of steps:- 16  Temp. rise of oil/winding:- 500C/550C  Vector Group:- YDn1  Short circuit current(max duration 3 sec):- HV=1.749 KA & LV=6.99 KA
  20. •% Impedance Voltage HV/LV: Tap No. Guaranteed at N tap Actual (after test) Tap 1 12.5% (± 10%) 12.14% Tap 9b 11.64% Tap 17 11.33% •Insulation Level:- Testing Voltage HV HVN LV Um(Highest sys V) 145 36 AC(Power frequency) 230 38 70 Lightning Impulse 550 95 170 •Core & Winding Mass:- 45670 Kg •Tank & Fitting Mass:- 12520 Kg •Oil Mass:- 17830 kg •Total Transformer mass:- 76020 Kg •Transformer mass(oil filled):- 68420 kg •Total oil quantity:- 20030 litres
  21. Cooling Fans MOG POWER TRANSFORMER 4 POWER TRANSFORMER 3 HV Bushings Conservator Radiator Bank Buchholz relay Oil pump Earthing Transformer Oil level indicator