ABB Relion 650 Series Technical Manual page 289

1MRK 506 326-UUS B
Section 10
10.1 Synchronism check, energizing check, and synchronizing
SESRSYN (25)
10.1.1 Identification
Function description
Synchrocheck, energizing check, and
synchronizing
10.1.2 Functionality
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 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 for slip frequencies that are larger
than those for synchronism check and lower than a set maximum level for the synchronizing
function.
Line distance protection REL650
Technical manual
Control
IEC 61850
identification
SESRSYN
© Copyright 2011 ABB Power Grids. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
25
sc/vc
SYMBOL-M V1 EN-US
Section 10
Control
IP14558-1 v4
M14889-1 v4
M12480-3 v9
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