ABB Relion 670 Series Technical Reference Manual page 621

Line differential protection ansi

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Table of Contents

1MRK505222-UUS C

Technical reference manual

About this chapter

This chapter describes the control functions. The way the functions work, their setting

parameters, function blocks, input and output signals and technical data are included

for each function.

Synchronism check, energizing check, and

synchronizing SESRSYN (25)

Function description

Synchrocheck, energizing check, and

synchronizing

Introduction

The Synchronizing function allows closing of asynchronous networks at the correct

moment including the breaker closing time, which improves the network stability.

Synchrocheck, energizing check, and synchronizing (SESRSYN, 25) function checks

that the voltages on both sides of the circuit breaker are in synchronism, or with at least

one side dead to ensure that closing can be done safely.

SESRSYN (25) function includes a built-in voltage selection scheme for double bus

and breaker-and-a-half or ring busbar arrangements.

Manual closing as well as automatic reclosing can be checked by the function and can

have different settings.

For systems which are running asynchronous a synchronizing function is provided.

The main purpose of the synchronizing function is to provide controlled closing of

circuit breakers when two asynchronous systems are going to be connected. It is used

identification

SYMBOL-M V1 EN

ANSI/IEEE C37.2

device number

Relion red670