Current Reversal And Weak-End Infeed Logic For Residual Overcurrent Rcrwpsch - ABB RELION REX640 Technical Manual

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1MRS759142 C

Technical Manual

Current reversal and weak-end infeed logic for

residual overcurrent RCRWPSCH

Identification

Function description

Current reversal and weak-end infeed

logic for residual overcurrent

Function block

GUID-6D239C90-876C-4529-AAEE-504FC1BCFC05 V1 EN

Function block

Functionality

The current reversal and weak-end infeed logic for residual overcurrent function

RCRWPSCH can be used when the communication logic for residual overcurrent

RESCPSCH requires additional logics to operate correctly in all power system

In parallel feeder applications, the direction of the fault current on the healthy feeder

can change when the circuit breaker on the faulty feeder opens to clear the fault. This

can lead to an unwanted operation of the residual overcurrent protection on the healthy

parallel feeder when RESCPSCH with the permissive overreach scheme is used. The

main purpose of the current reversal logic is to prevent such unwanted operations.

The permissive communication schemes can operate only when the protection in the

remote terminal can detect the fault. This detection requires sufficient minimum fault

current. If such current is not available due to too weak a remote end source, the WEI

logic can be used to overcome the situation and trip the remote end breaker.

Analog channel configuration

RCRWPSCH has one analog group input which must be properly configured.

Protection related functions

identification

ANSI/IEEE C37.2

device number

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