Operation Principle - ABB RELION REX640 Technical Manual

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Supervision functions

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 SEQSPVC can be described with a module diagram. All the modules

in the diagram are explained in the next sections.

GUID-876A3950-E9C6-4879-9FA6-303148912F04 V1 EN

Functional module diagram

Negative phase-sequence criterion

A fuse failure based on the negative-sequence criterion is detected if the measured

negative-sequence voltage exceeds the set Neg Seq voltage Lev value and the

measured negative-sequence current is below the set Neg Seq current Lev value. The

detected fuse failure is reported to the decision logic module.

Voltage check

The phase voltage magnitude is checked when deciding whether the fuse failure is a

three, two or a single-phase fault.

1MRS759142 C

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