Trip Circuit Supervision Relay| TCS Relay | How Does TCS Relay Work?

Hello, friends
I’m Zahid Rahman it’s an EEE campus presentation.
Today I’m showing what is master trip relay in bangla? Trip Circuit Supervision Circuit senses any fault either in the trip coil of breaker or trip circuit. On sensing a fault, Trip Circuit Supervision Relay changes its contact status to window annunciation on the panel. Here fault in the circuit means any break or open circuit. In this post we will be discussing the working principle of trip circuit supervision.
Basically, a breaker is equipped with two trip coils. Both the trip coil energizes if relay issues a tripping command. On energize of trip coil, breaker mechanism opens the circuit breaker. Therefore, it is very important to monitor the trip coil healthiness otherwise during the requirement the breaker may not open to clear the fault. Figure below, shows the simplified diagram of trip circuit supervision.
Trip Circuit Supervision Relay is provided to monitor the healthiness of trip coil. As there are two trip coils therefore, there will be two Trip Circuit Supervision Relays and hence two different circuits. This Relay has three coils namely RLA, RLB and main coil (RLC) of the Relay as shown in the figure above. Now, breaker may either be open or close, therefore we need to monitor the healthiness in both the state of the breaker. Thus, trip circuit supervision is divided as
a. Pre close supervision.
b. Post close supervision.

Discussion about Master Trip Relay
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Thanking you.
Zahid
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