Srijan tripathi(220kv gss) ppt
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UTTAR PRADESH POWER C0RPORATION LTD.
SRIJAN TRIPATHIEN- 4th YEAR
2014-2015(10 June 2014 to 10 July 2014)SUBMITTED BY: SRIJAN TRIPATHI11EAYEE049B. Tech. IV Yr., VII Sem.
CONTENTSubstationMain equipment at substationTransformerLightning ArrestorsCurrent Voltage TransformerWavetrapCT & PTIsolatorCircuit BreakerBus Bar
SubstationAn Electrical Substation is a subsidiary station of an electricity Generation , Transmission And Distribution System where voltage is transformed high to low or reverse using transformer.Examples of Substation:-400kV/220kV substation220kV/132kV substation132kV/33kV substation33kV/11kV substation33kV/.4kV substation
ABOUT 220KV SUBSTATION CANTTINCOMING LINES220 KV REWAROAD LINE 220 KV FATEHPURLINE OUTGOING LINES132 KV REWAROAD LINE 132 KV MANURI LINE
220kV Substation It is devided into two(2) parts:-Panel SectionControl Panel SectionRelay and Protection Panel SectionSwitch Yard220kV Section132kV section33kV sectionBattery Room (Extra)
MAIN EQUIPMENTS AT ALLAHABAD CANTT SUBSTATION 220KV
TRANSFORMERSPOWER TRANSFORMERSTransformer is a static machine, which transforms the potential of alternating current at same frequency. It means the transformer transforms the low voltage into high voltage & high voltage to low voltage at same frequency. It works on the principle of mutual inductance.When the energy is transformed to a higher voltage, the transformer is called step up transformer and then it is transmitted at lower voltage it is called step down transformer.There are 3 transformers in the substation:160MVA, 220/132 KV (2nos.)100 MVA TRANSFORMER(1)
Power Transformer feeding160 MVA transformers are manufactured by ADITYA and by TRM. These are the power transformers and , there efficiency is high. Primary side is star connected while secondary is delta connected. There are seventeen tapping in it. Every transformer has OLTC to change the tap for controlling voltage.
TYPES OF COOLING:AIR NATURAL COOLINGAIR BLAST COOLINGOIL NATURAL COOLINGOIL BLAST COOLING etc.
LIGHTNING ARRESTERDEFINATION A lightning arrester is a device used on electrical power systems to protect the insulation on the system from the damaging effect of lightning.
L.A CIRCUIT DIAGRAM1.Rod arrester2.Horn gap arrester3.Multi gap arrester4.Expulsion type lightning arrester5.Valve type lightning arrester6. Silicon Carbide Arrestors7. Metal Oxide ArrestorsAt MURAD NAGAR substation we use ZINC OXIDE ARRESTOR GAPLESSALSO KNOWN AS SURGE ARRESTERUSED IN THE POWER SYSTEMS TO PROTECT FROM LIGHTNINGWHEN SUURGE TRAVELS ALONG THE LINE , THE ARRESTOR DIVERTS IT TO THE EARTH
CAPACITOR VOLTAGE TRANSFORMERAcapacitor voltage transformer(CVT), orcapacitance coupled voltage transformer(CCVT) is atransformerused inpower systemsto step down extra high voltagesignals and provide alow voltagesignal, for measurement or to operate aprotective relay.In its most basic form the device consists of three parts: twocapacitorsacross which the transmission line signal is split, aninductive elementto tune the device to the line frequency, and a transformerto isolate and further step down the voltage for the instrumentation or protective relay.
CURRENT VOLTAGE TRANSFORMERCVTs are typically single-phase devices used for measuring voltages in excess of one hundred kilovolts where the use of wound primary voltage transformers would be uneconomical. In practice, capacitor C1is often constructed as a stack of smaller capacitors connected in series. This provides a large voltage drop across C1and a relatively small voltage drop across C2.
WAVE TRAPReliable & fast communication is necessary for safe efficient & economical power supply . To reduce the power failure in extent & time, to maintain the interconnected grid system in optimum working condition to coordinate the operation of various generating unit communication network is indispensable for state electricity board.
Current transformer Reduced high voltage in a fixed voltage and measurements purpose alsoPotential transformerMeasurement of electric currents and protective relays
ISOLATORIsolatorUsed to ensure that an electrical circuit is completely de-energised for service or maintenance. Such switches are often found inelectrical distribution andindustrialapplications, where machinery must have its source of driving power removed for adjustment or repair. High-voltage isolation switches are used in electrical substations to allow isolation of apparatus such ascircuit breakers,transformers, and transmission lines, for maintenance. The disconnector is usually not intended for normal control of the circuit, but only for safety isolation. Disconnector can be operated either manually or automatically (motorized disconnector)
STEPS OF OPERATION OF ISOLATORSEQUENCE OF STEPS FOR ATTENDING MAINTENANCE:Open CB on no load or full loadOpen the isolator on no loadClose the earth switch
SEQUENCE OF STEPS FOR KEPT IN SERVICEOpen the earth switchClose the isolatorClose the CB
CIRCUIT BREAKERA circuit breaker is equipment, which can open or close a circuit under normal as well as fault condition. These circuit breaker breaks for a fault which can damage other instrument in the station. It is so designed that it can be operated manually (or by remote control) under normal conditions and automatically under fault condition. Whenever a fault occurs trip coil gets energized, the moving contacts are pulled by some mechanism & therefore the circuit is opened or circuit breaks.
DIFFERENT CIRCUIT BREAKERS
CIRCUIT BREAKER2OIL CIRCUIT BREAKERS2OIL CIRCUIT BREAKERSOil circuit breakerAir-blast circuit breakerSulpar hexafluoride circuit breaker (SF6)Vacuum circuit breakers
Bus-barsBus Bars are the common electrical component through which a large no of feeders operating at same voltage have to be connected. Carry electrical supply