Synchronism Check, Energizing Check, And Synchronizing Sesrsyn (25) - ABB RELION 670 SERIES Applications Manual

Line distance protection

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Table of Contents

1MRK 506 369-UUS -

Line distance protection REL670 2.2 ANSI

Application manual

Synchronism check, energizing check, and

synchronizing SESRSYN (25)

Identification

Function description

Synchrocheck, energizing check, and

synchronizing

Synchronizing

To allow closing of breakers between asynchronous networks, a synchronizing feature is

provided. The breaker close command is issued at the optimum time when conditions

across the breaker are satisfied in order to avoid stress on the network and its components.

The systems are defined as asynchronous when the frequency difference between bus and

line is larger than an adjustable parameter. If the frequency difference is less than this

threshold value the system is defined to have a parallel circuit and the synchronism check

function is used.

The synchronizing function measures the difference between the V-Line and the V-Bus.

It operates and enables a closing command to the circuit breaker when the calculated

closing angle is equal to the measured phase angle and the following conditions are

simultaneously fulfilled:

identification

SYMBOL-M V1 EN

ANSI/IEEE C37.2

device number