ABB RELION REX640 Technical Manual page 1132

Protection and control

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Protection functions

Analog channel configuration

HCUBPTOC has two analog group inputs which must be properly configured.

Table 1076: Analog inputs

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

Figure 633: 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.

See the preprocessing function blocks in this document for the possible

signal sources.

Three-phase currents

Three-phase unbalance currents

1MRS759142 F

Technical Manual