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 three-phase current unbalance protection for shunt capacitor banks operates on

the DFT measurement mode. The operation of HCUBPTOC can be described by

using a module diagram. All the modules in the diagram are explained in the next

GUID-9FDAE00A-E297-426D-96D1-B1E78DC4B16C V1 EN

Function module diagram

Natural unbalance compensation

In the three-phase H-bridge-connected shunt capacitor bank configuration, the

unbalance currents I_UNB_A, I_UNB_B and I_UNB_C are measured at the

common points of the H-bridge.

1MRS759142 C

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