ABB RELION REX640 Technical Manual page 662

Protection and control

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Protection functions

Figure 373: Operation logic of instantaneous high stage

Direct inter-trip

Direct inter-trip is used to ensure the simultaneous opening of the circuit breakers

at both ends of the protected line when a fault is detected. Both start and operate

signals are sent to the remote end via communication. The direct-intertripping

of the line differential protection is included into LNPLDF. The OPERATE output

combines the operate signals from both stages, local and remote, so that it can be

used for the direct inter-trip signal locally.

1MRS759142 F

Technical Manual