ABB Relion 650 Series Technical Manual page 152

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Table of Contents

Impedance protection

Functionality

Automatic switch onto fault logic, voltage and current based (ZCVPSOF) is a function that gives an

instantaneous trip at closing of breaker onto a fault. A dead line detection check is provided to

activate the function when the line is dead.

Mho distance protections can not operate for switch onto fault condition when the phase voltages

are close to zero. An additional logic based on VI Level is used for this purpose.

Function block

ANSI09000057 V1 EN-US

Figure 82: ZCVPSOF Function block

Table 54: ZCVPSOF Input signals

Table 55: ZCVPSOF Output signals

ANSI09000057-1-en.vsd

Three phase group signal for current inputs

Three phase group signal for voltage inputs

Block of function

External enabling of SOTF

Distance zone to be accelerated by SOTF

Trip by pilot communication scheme logic

1MRK 506 326-UUS B

SEMOD153644-5 v3

SEMOD156265-4 v4

PID-1521-INPUTSIGNALS v5

PID-1521-OUTPUTSIGNALS v5

Line distance protection REL650

Technical manual