SNAT 603 CNT  ABB  Multi-Function Processor Module

The arc protection is implemented by using REA 101. The arc sensor loop of the relay passes through all the spaces that are to be protected. Tripping requires a light signal generated by an arc, and an overcurrent signal caused by a fault current. Current is measured three-phase as 5 A or 1 A secondary current. When an arc occurs, the Q2 circuit breaker is operated via the semiconductor output HSO1. In alternative 2, the semi-conductor output HSO2 is used as a circuit-breaker failure protection output. If the feeder circuit breaker Q2 for some reason is unable to break the fault current within 100 ms after the trip operation, the circuit breaker Q1 on the transformer primary side is opened via output HSO2.

This application is similar to the example 1, with the exception that the terminal end of the arc sensor fiber has not been brought back to the arc protection relay. However, the loop arrangement where both ends of the sensor fiber are connected to the relay is preferred, because this radial arrangement does not allow monitoring of the sensor fiber. The condition monitoring feature has to be deactivated (switch SG3/4).

In this example, the number of arc sensor loops has been increased to five by adding two REA 103 extension units, which have been linked to the chain connected to port A via connection cables.

Tripping is activated in the same way as in the examples 1 and 2. Information about the loop that detected the arc is obtained via the alarm relay outputs Light1 and Light2 of the REA 103 extension units. As the extension unit S2 is the last one in the chain connected to port A, the connection cable has to be terminated here by connecting the terminators (programming switch SG1/1 = ON).

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