ABB RELION REX640 Technical Manual page 1027

Protection and control

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1MRS759142 F

This function contains a blocking functionality. It is possible to block the function

outputs, reset timer or the function itself.

Analog channel configuration

UZPDIS has two analog group inputs which all must be properly configured.

Table 958: Analog inputs

There are a few special conditions which must be noted with the configuration.

Table 959: Special conditions

U3P connected to real measurements

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

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

The operation of UZPDIS can be described with a module diagram. All the modules

in the diagram are explained in the next sections.

Technical Manual

See the preprocessing function blocks in this document for the possible

signal sources.

Protection functions

Three-phase currents

Three-phase voltages

The function can work with one voltage chan-

Phase Sel for Z Clc set to "AB",

nel connected (

"BC" or "CA"), if the setting

mode is set to "1Phase-to-phase".

The function requires that at least two (the

third voltage will be derived) or all three

voltage channels are connected if

Meas mode is set to "3Phase-to-phase".

Operation setting. The

Impedance Meas