ABB RELION REX640 Technical Manual page 773

Protection and control

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Table of Contents

1MRS759142 F

Identification

Function description

High-impedance differential protec-

tion for phase A

High-impedance differential protec-

tion for phase B

High-impedance differential protec-

tion for phase C

Function block

Figure 438: Function block

Functionality

The high-impedance differential protection function HIxPDIF is a general differential

protection. It provides a phase-segregated short circuit protection for the busbar.

However, the function can also be used for providing generator, motor, transformer

and reactor protection.

The function starts and operates when the differential current exceeds the set limit.

The operate time characteristics are according to definite time (DT).

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

outputs, timer or the whole function.

Analog channel configuration

HIxPDIF has one analog group input which must be properly configured.

Table 696: 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.

Technical Manual

See the preprocessing function blocks in this document for the possible

signal sources.

identification

Three-phase currents

Protection functions

ANSI/IEEE C37.2

device number