Siemens SIPROTEC Manual page 208

Line differential protection with distance protection

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2.7 Teleprotection for Distance Protection (optional)

The isolation voltage of the pilot wires and the binary inputs and outputs must also be taken into account. In the

event of an earth fault the induced longitudinal voltage must neither exceed 60% of the isolation voltage of the

pilot wires nor 60% of the isolation of the device. The pilot wire comparison is therefore only suited for short

Receive circuit of pilot wire comparison logic

SIPROTEC, 7SD5, Manual

C53000-G1176-C169-5, Release date 02.2011