Analog Channel Configuration; Operation Principle - ABB RELION REX640 Technical Manual

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1MRS759142 C

Technical Manual

The function contains a blocking functionality. It is possible to block function outputs,

timers or the function itself.

Analog channel configuration

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

Analog inputs

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.

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

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

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

modules in the diagram are explained in the next sections.

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Functional module diagram

Level detector

The level detector compares the differential neutral current IDo to the set value of the

Operate value setting. If the differential neutral current exceeds the Operate value

setting, the level detector sends an enable signal to the timer module to start the

definite timer.

Protection functions

Residual current (measured)

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