ON 400 KV GSS RAISER JAIPUR ROAD ,BIKANER SEMINAR REPORT ON 400 KV GSS RAISER JAIPUR ROAD ,BIKANER Presented by-:

CONTENT:- Introduction Equipment Working Of Equipment Conclusion

ABOUT R.R.V.P.N.L Rajasthan Rajya Vidyut Prasaran Nigam Limited(RVPN) has been established under companies Act 1956 by Govt. of Rajasthan and registered with Registrar of Companies as "RAJASTHAN RAJYA VIDYUT PRASARAN NIGAM LIMITED" of 2000-2001with its Registered Office at VIDYUT BHAWAN, JYOTI NAGAR, JAIPUR . The granted RVPN a license for transmission and bulk supply and RVPN has discharging its function as a Transmission and Bulk Supply License in the State.

Potential Transformer Current Transformer Auto transformer EQUIPMENT OF SUB STATION Wave trap Lightning Arrester Isolator Bus bar Power Transformer Potential Transformer Current Transformer Auto transformer Circuit Breaker Buchholz relay Power Line Carrier Communication (PLCC)

WAVE TRAP Wave trap acts as barrier to prevent signal losses. Wave trap are cylinder like structures connected in series with high voltage transmission line. Wave trap is also known as a LINE TRAP.

LIGHTNING ARRESTER A Lightning arrester is known as a SURGE Protectors. It is connected between Electrical conductor and the earth. It provide a path over which high voltage lightning current flows.

ISOLATERS : Isolators are designed to open a ckt under no load. Its main purpose is to isolate portion of ckt from the other & is not intended to be opened while current is flowing in the line. There are two types of isolators:- off load isolators on load isolators

ISOLATERS

BUS BAR DEFINITION:- A bus bar is a conducting bar that carries heavy currents to supply several electric circuits. Bus bars are copper rod or thin walled tubes and operate at constant voltage. TYPES OF BUSBARS:- Main bus bar Auxiliary bus bar One bus bar is main bus bar & another is spare or auxiliary bus bar.

DIAGRAM OF BUS BAR

POTENTIAL TRANSFORMER Potential transformers are instrument transformers. They have a large number of secondary turns and a fewer number of primary turns. They are used to increase the range of voltmeters in electrical substations and generating stations. These are also called as voltage transformers used for line and circuit protections.

DIAGRAM OF PT’s

CURRENT TRANSFORMER CT are a series connected type of instrument transformer. CT is used for the measurement of electric current by extending the range of Ammeters and current coils(CC).

DIAGRAM OF CT

POWER TRANSFORMER Transformer is an electrical machine which works on the principle of electromagnetic induction. It transfers electric power from one electric ckt to other with the help magnetic path(flux) on constant frequency but equal or different current voltages. For this purpose two sets of insulated windings are wounded on a close terminated steel core. The winding which is connected to the supply is called primary winding & that winding is connected to the load is called secondary winding.

DIAGRAM OF POWER TRANSFORMER

AUTO TRANSFORMER Auto transformer kind of electrical transformer where primary and secondary winding shares same common single winding. In a two winding transformer ,primary and secondary winding are electrically isolated, but in Auto transformer the two winding are not electrically isolate.

CIRCUIT BREAKER A circuit breaker is a piece of equipment which can:- break a ckt automatically under fault conditions. make a ckt either manually or by remote control under fault conditions. PRINCIPLE:- A ckt breaker essentially consists of fixed & moving contacts, called electrodes under normal operating conditions, these contacts remain closed & will not open automatically until & unless the systems becomes faulty. When a fault occurs on any part of the system, the trip coils of the breaker get energised & the moving contacts are pulled apart by some mechanism.

CLASSIFICATION OF CIRCUIT BREAKER oil circuit breakers Sulphur Hexa Fluoride circuit breakers Air-Blast circuit breakers vaccum circuit breakers Under training SF6 type, vaccum ckt breaker & Air-Blast ckt breakers were used in the GSS.

BUCHHOLZ RELAY Definition:- Buchholz relay is a gas actuated relay. It can only be fitted to the transformers equipped with conservator tanks as it is installed in b/w the conservator tank and the main tank. Principle:- Whenever a fault occurs inside the transformers, the oil of the tank gets overheated and gases are generated. The heat generated by the high local current causes the transformer oil to decompose and produce gas which can be used to detect the faults.

DIAGRAM OF BUCHHOLZ RELAY

POWER LINE CARRIER COMMUNICATION For exchange of data’s and transfer message between grid substation voice communication is necessary for this purpose high frequency carrier current is transmitted on same transmission line on which power is transmitted. Hence such communication is called “power line communication

DIAGRAM OF PLCC

CONCLUSION Design of sub station involves a number of complexities and detailed engineering. A judicious approach in tackling various problems is required on the part of design engineers as well as the suppliers of various equipment so as to achieve trouble free operation of power system.

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