We all know that breaker is switch which is going to operate under normal condition manually and abnormal condition automatically. When the high amount of current was breakup then high amount of arc will struck which is un desirable,so breaker also consists of arc extinguisher medium.
structure of normal power system protection
1.Relay.
2.Master relay or lockout relay (its code 86,it should resettled manually).
3.Trip coil 1,2 (which are in breaker, coil 2 is used as backup coil).
4.Close coil.
sf6 gas 400kv T shape breaker ( two interrupter)
sf6 gas filling at site after erection
Cascading two 400kv breaker in application of 765kv (India)
Grading capacitance used in breaker for inductive loads
Name plate of grading capacitance
When any fault occurs on system it is going to be sensed by relay and give trip pickups master trip relay.Then 86 will pickup and close the tripping circuit by using trip coil (both 1,2 coils),in case of any fault in coil 1 then coil 2 will come in to picture.once the fault is cleared then first we have to reset the 86 and then should give close command to close coil in order to close the breaker.
1. RELAY
2.86 or MASTER TRIP COIL.
3.BREAKER TRIP COILS.
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