Operation Principle - ABB RELION REX640 Technical Manual

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Protection related functions

The directional comparison unblocking scheme DCUB can also be implemented by

complementing the permissive schemes with an additional logic called the unblocking

function, which is also included in DSOCPSCH.

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

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

infeed logic function CRWPSCH.

Operation principle

The function can be enabled and disabled with the Operation setting. The

corresponding parameter values are "on" and "off".

The operation of DSOCPSCH can be described with a module diagram. All the

modules in the diagram are explained in the next sections.

GUID-1C6DD874-2530-4878-9C02-99A339282B44 V1 EN

Functional module diagram

The applied communication scheme logic in DSOCPSCH is selected with the Scheme

type setting.

1MRS759142 C

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