ABB Relion 650 Series Technical Manual page 140

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Table of Contents

Impedance protection

Phase preference logic PPLPHIZ

Identification

Function description

Phase preference logic

Functionality

Phase preference logic function PPLPHIZ is intended to be used in isolated or high impedance

grounded networks where there is a requirement to trip only one of the faulty lines at cross-

country fault.

Phase preference logic inhibits tripping for single phase-to-ground faults in isolated and high

impedance grounded networks, where such faults are not to be cleared by distance protection.

For cross-country faults, the logic selects either the leading or the lagging phase-ground loop for

measurement and initiates tripping of the preferred fault based on the selected phase preference.

A number of different phase preference combinations are available for selection.

Function block

ANSI09000060 V1 EN-US

Figure 76: PPLPHIZ function block

Table 42: PPLPHIZ Input signals

ANSI09000060-1-en.vsd

identification

Three phase group signal for current inputs

Three phase group signal for voltage inputs

Block of function

Release condition for the A to ground loop

Release condition for the B to ground loop

Release condition for the C to ground loop

Integer coded external release signal

1MRK 506 326-UUS B

ANSI/IEEE C37.2

device number

PID-1444-INPUTSIGNALS v5

Line distance protection REL650

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