ABB Relion 650 Series Technical Manual page 478

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Table of Contents

Functionality

The accurate fault locator is an essential component to minimize the outages after a persistent

fault and/or to pin-point a weak spot on the line.

The fault locator is an impedance measuring function giving the distance to the fault as a relative

(in%) or an absolute value. The main advantage is the high accuracy achieved by compensating for

load current.

The compensation includes setting of the remote and local sources and calculation of the

distribution of fault currents from each side. This distribution of fault current, together with

recorded load (pre-fault) currents, is used to exactly calculate the fault position. The fault can be

recalculated with new source data at the actual fault to further increase the accuracy.

Especially on heavily loaded long lines (where the fault locator is most important) where the

source voltage angles can be up to 35-40 degrees apart the accuracy can be still maintained with

the advanced compensation included in fault locator.

Function block

ANSI09000621 V1 EN-US

Figure 245: LMBRFLO function block

Table 415: LMBRFLO Input signals

ANSI09000621-1-en.vsd

Phase selection phase A

Phase selection phase B

Phase selection phase C

Input signal to initiate fault distance calculation

1MRK 506 326-UUS B

GUID-4426B242-BE9E-4D6A-8DFF-9EB9F728A36A v1

PID-1797-INPUTSIGNALS v5

Line distance protection REL650

Technical manual