Aseminar on

Practical Training taken at220KV GSS VKIA

Submitted To: Submitted by: Ms.Shivani Johri Renuka Verma Head Of Department 4th year, EE

Department of Electrical EngineeringSri Balaji Technical Campus, Jaipur

RTU, Kota September-2015

CONTENT Introduction Grid sub-station Definition of sub-station Lightning arrestor Capacitor voltage transformer Wave trap Isolator Current transformer Circuit breaker Bus bar Transformer Protective relay Control room Conclusion

INTRODUCTION

RVPNL is a company of Rajasthan State Electricity Board(RSEB) established by govt. of Rajasthan.

Aim of RVPNL is to provide reliable transmission

service to customers.

220KV G.S.S.,VKIA is a part of RVPNL.

In the GSS single main and auxiliary scheme is used.

GRID SUB-STATION

DEFINATION OF SUBSTATION

Sub station is a subsidiary station of an electrical generation , transmission and distribution system.

It is a set of equipment reducing the high voltage of electrical power transmission to that suitable for supply to consumer.

Electric power may flow through several sub-station between generated plant and consumer and may be changed in voltage in several steps.

LIGHTENING ARRESTOR

Lightning arrester is a protective device which provides protection against high voltage surges.

A lightning arrester has two terminals viz a high voltage terminal and a ground terminal.

CAPACITIVE VOLTAGE TRANSFORMER

Capacitive voltage transformer are special kind of power transformer.

It is used to step down extra high voltage signals and provide a low voltage signal for operating a protective relay.

WAVE TRAP ( line trap )

A line trap (high-frequency stopper) is a maintenance-free inductor, mounted inline on high voltage AC transmission power lines to prevent the transmission of high frequency (40 kHz to 1000 kHz) carrier signals of line communication to unwanted destinations.

ISOLATOR

It isolates the devices from live line when there is a maintenance.

It operates when there is no load.

It is also used to change bus bar line from main to reserve or vise versa.

CURRENT TRANSFORMER

C.T. is used to measure high value of current.

C.T.’s secondary is connected to relay to protect the system against over current.

CIRCUIT BREAKER Circuit breaker is used for break the circuit. Today, two most popular circuit breakers are used in

substation which are: Vacuum circuit breaker & SF6 circuit breaker.

Oil and air blast circuit breaker was used in earlier decades.

BUS BAR

Bas bars are common electrical component through which a large no. of feeders operating at same voltage have to be connected.

TRANSFORMER

The transformer is a static apparatus, which receives power/energy at it, one circuit and transmits it to other circuit without changing the frequency.

PROTECTIVE RELAY

A protective relay is a device that detects the fault and initiates the operation of the circuit breaker to isolator the defective element from the rest of the system.

CONTROL ROOM

CONCLUSION

I studied lot of knowledge in G.S.S. lot of instrumentation and protection required. So i gain lot of knowledge.

Training at 220kv GSS VKIA gives the insight of the real instrument used.

There are many instruments like transformer, C.T., P.T., L.A., relay, bus bar, capacitor bank, insulators, isolators, controlroom, etc.

To get insight of the sub-station, how things operates, how things manage all is learned there.