ABB RELION REX640 Technical Manual page 1149

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1MRS759142 C

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GUID-7689FC42-E6D9-4B59-8B22-0DF82FCCCB29 V1 EN

Simplified functional diagram of the permissive underreach scheme

Permissive overrreaching transfer trip scheme POTT

The permissive overreach scheme is enabled with Scheme type = "Permissive

In this scheme, the start signal from the overreaching zone Z2 is connected to the

CSOR input to create a CS_PRM signal. The CS_PRM signal can also be issued

simultaneously from the underreaching zone Z1. In this case, the start signal from the

underreaching zone Z1 is connected to the CSUR input. The duration of the CSUR

input signal is prolonged by the Carrier Min Dur setting to ensure a sufficient duration

of the CS_PRM signal.

In case of parallel feeders, and when the external current reversal logic

(CRWPSCH) is enabled, the CS_PRM signal is not prolonged and the

value of Carrier Min Dur is set to zero to secure correct operation.

In the permissive overreach scheme, the received signal CR_PRM, or CRL if the

unblocking function is enabled, is used to allow the overreaching zone Z2 to trip

(activation of the OPERATE output) after the settable pick-up delay Coordination

Time. The start signal from the overreaching zone is connected to the CACC input.

Activating the BLOCK input totally blocks the permissive overreach scheme. The

CS_PRM and OPERATE outputs can be blocked by the BLK_CS_OPR input.

Protection related functions

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