03-05-2012, 11:01 AM
SUB STATION
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INTRODUCTION OF SUB STATION
The present Day electric power is generated transmitted & distributed in the form of A.C
It may desirable &necessary to change some characteristic of electric suuply which accomplish by suitable apparatus called substation
SWITCH YARD
The term switchgear, used in association with the electric power system, or grid, refers to the combination of electrical disconnects, fuses and/or circuit breaker used to isolate electrical equipment.
Basic Component Of Switch Yard:
1. Isolator .
2. Current x-mer.
3. Potential x-mer.
4. Circuit breaker .
5. Lightning arrester .
CIRCUIT BREAKER
CIRCUIT BREAKER IS NOTHING BUT A SWITCH USED TO OPEN OR CLOSE THE CIRCUIT UNDER LOADING CONDITIONS. VACUUM CIRCUIT BREAKER IS EMPLOYED IN THIS POWER PLANT.
WHEN EVER THE RELAY SENSES THE FAULT & GIVE SIGNAL TO THE CIRCUIT BREAKER IT OPENS OR CLOSES THE CIRCUIT.
conclusion
From the project on substation about switch gear, it is very necessary to protect every substation. Switch yard plays a major role in protection of substation. The periodic maintenance should be done to every equipment in switchyard for better operation.
In this substation the distribution is of radial type which is more advantageous when compared with the other type of distribution system. Butchholtz relay is more useful to protect the transformers from slow rising faults.SF6 and Air break circuit breakers are efficient to protect substation.