DSDX453  ABB  Communication Interface

In this case, it is enough for the protection relay to operate if one of the units detects overcurrent, even in a situation where one transformer is out of service and the other transformer feeds the whole switchgear over the bus coupler. The REA 105 extension units perform selective tripping in situations where the arc fault is located behind the concerned circuit breakers.

The functions of this application corresponds to that described in the example 8. The difference is that the overcurrent signals between the central units are transmitted via the connection cable of the extension units. An REA 105 unit (not REA 103) has to be used in the connection point between the coverage areas of the central units. This REA 105 unit can normally be used as a part of the system that ends in a central unit in the direction of the terminal IN1. Since the links from both directions end in extension unit S3, the terminators of the ports IN1 and IN2 have to be connected (SG1/1, 2 = ON).

Each infeeder has its own central unit measuring fault current. Overcurrent data is transmitted to each extension unit over the connection cable of the units. Once the central unit M1 or the extension unit S1 detects an arc, the circuit breakers Q2 and Q3 are opened. When the central unit M2 or the extension unit S3 detects a fault, the circuit breakers Q3, Q5 and Q6 are opened. Correspondingly, when the M3 or the S2 unit detects an arc, the circuit breakers Q6 and Q8 will be opened. This arrangement allows just the faulty part of the switchgear to be disconnected. The extension units S1 and S2 are located in the section where the protection areas are separated so the connection cables from both directions have to be terminated (SG1/ 1, 2 = ON). The trip signal of the circuit-breaker failure protection of the three central units is linked to the transformer primary circuit breakers (Q1, Q4 and Q7), with a delay of 150 ms

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