Communication Logic For Residual Overcurrent Rescpsch - ABB RELION REX640 Technical Manual

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Protection related functions

Communication logic for residual overcurrent

Identification

Function description

Communication logic for residual

Function block

GUID-61E9C294-8F58-44C7-ABC8-D9080F9F5215 V1 EN

Function block

Functionality

The communication logic for residual overcurrent function RESCPSCH is used to

achieve instantaneous fault clearing independent of the fault location on the protected

feeder. There are four available communication scheme types.

Direct underreaching transfer trip DUTT

Permissive underreaching transfer trip PUTT

Permissive overreaching transfer trip POTT

Directional comparison blocking scheme DCB

The directional comparison unblocking scheme DCUB can also be provided by

complementing the permissive schemes with an additional logic called the unblocking

function, which is also included in RESCPSCH.

If the permissive overreaching scheme is used, some of the power system conditions

require additional special logic circuits, such as the current reversal and weak-end

infeed logic for residual overcurrent function RCRWPSCH.

identification

1MRS759142 C

ANSI/IEEE C37.2

device number

Technical Manual

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