ABB RELION RET670, Applications Manual

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Section 15 Control
15.1 Synchronism check, energizing check, and
synchronizing SESRSYN (25)
IP14558-1 v4
15.1.1 Identification
M14889-1 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Synchrocheck, energizing check, and
synchronizing
SESRSYN
sc/vc
SYMBOL-M V1 EN-US
25
15.1.2 Application
IP15111-1 v1
15.1.2.1 Synchronizing
SEMOD171992-5 v9
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:
1MRK 504 163-UUS A
Section 15
Control
Transformer protection RET670 2.2 ANSI 677
Application manual