ABB RELION REX640 Technical Manual page 1017

Protection and control

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Table of Contents

1MRS759142 F

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 UEXPDIS can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 564: Functional module diagram

Impedance calculation

This module calculates the apparent impedance based on the selected voltages

and currents. The

which voltages and currents are to be used. If the

"1Phase-earth" or "1Phase-phase", the

determining which phase or phase-phase voltages ("A or AB", "B or BC" and "C or

CA") and currents should be used for calculating the impedance.

Table 947: Voltages and currents used in impedance calculation

Measurement mode

1Phase-earth

1Phase-phase

3Phase-earth

Table continues on the next page

Technical Manual

Measurement mode and Phase Sel for Z Clc settings determine

Phase Sel for Z Clc

Operation setting. The

Measurement mode is set to

Phase Sel for Z Clc setting is needed for

Voltages and currents

U_AB, I_A, I_B

U_BC, I_B, I_C

U_CA, I_C, I_A

U_A, U_B, U_C, I_A, I_B, I_C

Protection functions