UTTAR PRADESH POWER C0RPORATION LTD.
ARVIND PAL SINGHEE- 4th YEAR
DESCRIPTION OF 132KV SUBSTATION, KHURRAM NAGAR
The 132KV power substation has the capacity-(80MVA). It receives three 132kv lines from N.KN, Chinhut and kursi road . 2. It steps down this supply to 33kv. 33kv line gives supply to Nirala nagar,Mahanagar,eng. College,Kalyanpur and to other 9 places.
SINGLE LINE DIAGRAM 132KV SUBSTATION MURADNAGAR
TRANSFORMERSAlso known as the heart of substations. These are used to reduce the voltages at appropriate levelsCURRENT VOLTAGE TRANSFORMERSIt is aused inpower systemsto step downextra high voltagesignals and provide alow voltagesignal, for measurement or to operate aprotective relay
WAVETRAPTraps the high frequency signals
ISOLATORSUsed for maintenance of the circuit in no load condition CIRCUIT BREAKER used to protect the eqiupment by opening the circuit for over current and over voltagesLIGHTINING ARRESTERUsed for protecting the equipment from surge voltages
MAIN EQUIPMENTS AT KHURRAM NAGAR SUBSTATION 132KV
POWER TRANSFORMERS Transformer 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.They are of two type step up and step down .In substation there were 2 step down transformer of 1- 40MVA2-EMCO company3-ONAF(Oil Natural Forced Cooling)4-Rated line current -175/700 amp.
C.T & C.V.T
CURRENT TRANSFORMERIt is a device use to measure current. In substation C.T was of 1-BHEL company2-Turn ratio- 400:13-Rated primary current 800 amp C.V.TIt is a device use to measure voltage or potential .In sub station there was C.V.T of1-BHEL company2-Primary voltage 76kv
A circuit breaker is a device which is used to protect the electric circuit from over current or short circuit current . 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.
Sulpar hexafluoride circuit breaker (SF6) Sulphar hexa fluoride (SF6) gas is used as the arc quenching medium . The SF6 is an electronegative gas and has a strong tendency to absorb free electrons. Circuit breakers have been developed for voltage 115KV to 230KV , power rating10 MVA
Vacuum circuit breakersVacuum circuit breakers are circuit breakers which are used to protect medium and high voltage circuits from dangerous electrical situations.The pressure which is maintained is 6-10 bar
Air-blast circuit breakerFast operations ,suitability for repeated operation , auto reclosure , unit type multi break constructions ,simple assembly , modest maintenance are some of the main features of air blast circuit breakers. A compressors plant necessary to maintain high air pressure in the air receiver.
Oil circuit breakerA high-voltage circuit breaker in which the arc is drawn in oil to dissipate the heat and extinguish the arc; the intense heat of the arc decomposes the oil .
DIFFERENT CIRCUIT BREAKERS
ELECTRICAL INSULATORPORCELAIN INSULATORThey are basically aluminum silicate mixed with feldsparThey are widely and most commonly used insulatorGLASS INSULATOR It is made up of annealed tough glassADVANTAGES-High dielectric strengthHigh resistivityTransparent thus not heated in sunlightDISADVANTAGESEasy condensation of moisture thus provide a path for leakage current
MISC. EQUIPMENTS CAPACITOR BANKIt is used to improve the power factor at the load side.
RELAYIt is a sensing device which sense electrical quantity such as current,voltage,etc and activates when they goes above prescribed limit(peak value).DIFFERENT RELAYS which were used in substation are-1-Differential relay2-overcurrent relay 3-Directional relay