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CONDITION MONITORING OF POWER TRANSFORMERS CHAPTER.I BRIEF HISTORY OF KOTHAGUDEM THERMAL POWER STATION: 1.1 INTRODUCTION TO APGENCO: Andhra Pradesh Power Generation Corporation Limited (APGENCO) is the electricity generation company of the Government of Andhra Pradesh found in the year 1998 as a part of the network of APSEB (Andhra Pradesh State Electricity Board) in India. It has an installed capacity of 7048.4 MW which makes it the third largest power generation company in India. Andhra Prade
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  CONDITION MONITORING OF POWER TRANSFORMERS CHAPTER.IBRIEF HISTORY OF KOTHAGUDEM THERMALPOWER STATION: 1.1 INTRODUCTION TO APGENCO: Andhra Pradesh Power Generation Corporation Limited (APGENCO) is the electricity generation company of the Government of Andhra Pradesh foundin the year 1998 as a part of the network of  APSEB (Andhra Pradesh StateElectricity Board) in India. It has an installed capacity of  7048.4 MW whichmakes it the third largest power generation company in India.Andhra Pradesh Power Generation Corporation Limited is one of the pivotalorganizations of Andhra Pradesh, engaged in the business of Power generation.Apart from operation & Maintenance of the power plants it has undertaken theexecution of the ongoing & new power projects scheduled under capacity additionprogramme and is taking up renovation & modernization works of the old powerstations.APGENCO came into existence on 28.12.1998 and commenced operationsfrom 01.02.1999. This was a sequel to Governments reforms in Power Sector tounbundle the activities relating to Generation, Transmission and Distribution of Power. All the Generating Stations owned by erstwhile APSEB were transferred tothe control of APGENCO. The installed capacity of APGENCO as on September 30,2010 is 8135.9 MW comprising 4382.50 MW Thermal , 3751.40 MW Hydro and 2MW Wind power stations, and contributes about half the total Energy Requirementof Andhra Pradesh. APGENCO is third largest power generating utility in theCountry next to NTPC and Maharashtra. It's installed Hydro capacity of 3703.4MW is the second highest among the Country. Types of power plants APGENCO operates:Source Installed Capacity (MW) Thermal 4382.5 MWHydel 3751.40 MW DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING ABDUL KALAM INSTITUTE OF TECHNOLOGICAL SCIENCES, VEPALAGADDA (V), KOTHAGUDEM(M). page 1  CONDITION MONITORING OF POWER TRANSFORMERS Wind 2.00 MW Table1.1: Statistical Information Regarding DifferentThermal Power Plants Operating Under APGENCO: DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING ABDUL KALAM INSTITUTE OF TECHNOLOGICAL SCIENCES, VEPALAGADDA (V), KOTHAGUDEM(M). page 2  CONDITION MONITORING OF POWER TRANSFORMERS DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING ABDUL KALAM INSTITUTE OF TECHNOLOGICAL SCIENCES, VEPALAGADDA (V), KOTHAGUDEM(M). page 3 PowerStationOperatorLocationDistrictUnitWisecapacityInstalledcapacityPlantCoordinates RamagundamB thermalPowerStationAPGENCORamagundamkarimnagar1×62.562.518˚43’31”N79˚30’47”E KothagudemThermalPowerStation APGENCOPaloncha Khammam4×60,4×12072017˚37’18”N80˚41,15”EKothagudemThermalPowerStationV&IVStageAPGENCOPaloncha Khammam2×2501×50050050017˚37’24”N804˚2’060”E Dr Narla Tatarao TPSAPGENCOIbrahinpatnamKrishna 6×210,1×500176016˚35’58”N80˚32’12”ERayalaseema ThermalPowerStationAPGENCOCuddapahYSR4×21084014˚42’14”N78˚27’29”EKakatiya ThermalPowerAPGENCOChelpurWarangal1×500500182˚3’02”N79˚49’42”E  CONDITION MONITORING OF POWER TRANSFORMERS 1.2 ABOUT KTPS: Electricity is being produced at thermal, nuclear, hydel generating stations. Kothagudemthermal power station is one of the major power generating stations of the Andhra Pradesh. The mainraw material is coal is supplied by singereni collieries, Kothagudem and a water source is fromkinnerasani project, which is about 12kms. From paloncha.For the power generation with 2x110 MW and 3x210 MW of K.T.P.S. authorities arerequired to be operative to active full operation. The auxiliaries are basically operation either on L.T.System i.e. 415 V 3 Ø power supply is made available to the system after providing the stationtransformer of 3x50 MVA capacity with voltage 220 KV/ 7.2/7.2 KV & different service transformersof capacity 1.0 MVA, 1.5 MVA, 2.0 MVA, which are located near the load centre as the transformer having the voltage of 6.6 KV /415 V. The 6.6 KV power is distributed through 6.6 KVinterconnected Bus System for all the five units with a control through DC of 220 V.The 415 V power supply is done through a L.T. SWGR (Switchgear) which arelocated nearby the distribution transformer as well as the load centers. The all in -comers, which are breaker controlled , are having the control the L.T. SWGR are having the control system on 110/ 220V AC. The 6.6 KV power supply which are either MOCB (Minimum Oil Circuit Breaker) of JYOTIMAKE or Air Circuit Breakers.The 6.6 KV power supply to various draining equipment’s i.e. more is made through breakers which are either MOCB of jyothi make air circuit breaker which are either of voltage makersas well as SF 6 of NGEF make. The LT supply is also controlled through air break circuit breaker which are either L&T make or English Electric Company of India. The various H.T. motors areswitched on / started through on direct ON line (DOL) in order to inverse the availability of equipment at full efficiency without time gap.Further , the 6.6 KV system which is normally in delta configuration and terms as anunearthed system so also to keep the running motor complete in operating condition in case of anyone .phase of motor winding is earthed due to any one reason. Earthling is detected by an protectionsystem with alarm facility to take remedial measures immediately and at the same time to maintainthe generation level in the same condition, prior to occurring the earth fault the single phase earthfault is detected in due course till the motor is not earthed to other or another phase.Soot Blowers are there in the boiler area on the furnace side or Zone which helps in blowing the soot / ash deposition regularly of the furnace wall / economizer tubes to keep heat transfer at the required parameter. DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING ABDUL KALAM INSTITUTE OF TECHNOLOGICAL SCIENCES, VEPALAGADDA (V), KOTHAGUDEM(M). page 4
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