Operation Principle - ABB RELION REX640 Technical Manual

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Protection functions

See the preprocessing function blocks in this document for the

possible signal sources.

Improper analog channel configuration causes a validation error if the analog

channels are not completely configured or they do not match with certain settings. For

troubleshooting, check the contents of this chapter and also the preprocessing blocks

in this document. The configuration can be written to the protection relay once the

mismatch is corrected.

Operation principle

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

corresponding parameter values are "On" and "Off".

The operation of MPDIF can be described using a module diagram. All the modules

in the diagram are explained in the next sections.

GUID-E0FE531A-37D4-45A8-9B9A-C9C4C113A307 V1 EN

Functional module diagram

Differential and bias calculation

Differential calculation module calculates the differential current. The differential

current is the difference in current between the phase and neutral sides of the machine.

The phase currents

phase and neutral sides of the current. The amplitude of the differential current I

obtained using the equation (assuming that the positive direction of the current is

towards the machine):

Differential

denote the fundamental frequency components on the

1MRS759142 C

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