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 levels

CURRENT VOLTAGE TRANSFORMERSIt is a used in power systems to step downextra high voltage signals and provide a low voltage signal, for measurement or to operate a protective 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 voltages

LIGHTINING ARRESTER

Used for protecting the equipment from surge

voltages

MAIN EQUIPMENTS AT KHURRAM NAGAR SUBSTATION 132KV

TRANSFORMERS

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

CIRCUIT BREAKER

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 breakers Vacuum 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 INSULATOR

• PORCELAIN INSULATOR• They are basically aluminum silicate

mixed with feldspar• They are widely and most commonly

used insulator

• GLASS INSULATOR • It is made up of annealed tough glass• ADVANTAGES-• High dielectric strength• High resistivity• Transparent thus not heated in

sunlight• DISADVANTAGES• Easy condensation of moisture thus

provide a path for leakage current

MISC. EQUIPMENTS

• CAPACITOR BANK• It is used to improve the power

factor at the load side.

• RELAY• It 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

THANKS