Siemens SIPROTEC Manual page 448

Line differential protection with distance protection

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2.25 Function Control and Circuit Breaker Test

In 7SD5 the position of the circuit breaker poles detected by the device is also transmitted to the remote end

device(s). This way, the circuit breaker positions of all ends are known at all ends. The highcurrent switch-on-

to-fault protection (Section 2.14) makes use of this function.

Figure 2-222

Circuit breaker position logic

SIPROTEC, 7SD5, Manual

C53000-G1176-C169-5, Release date 02.2011