Section 12 Control; Synchronism Check, Energizing Check, And Synchronizing Sesrsyn (25); Identification; Application - ABB REB670 Applications Manual

1MRK 505 370-UUS A
Section 12
12.1
12.1.1
12.1.2
12.1.2.1
Busbar protection REB670 2.2 ANSI
Application manual
Control
Synchronism check, energizing check, and
synchronizing SESRSYN (25)

Identification

Function description
Synchrocheck, energizing check, and

synchronizing

Application

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:
IEC 61850 IEC 60617
identification identification
SESRSYN
sc/vc
SYMBOL-M V1 EN-US
Section 12
Control
IP14558-1 v4
M14889-1 v4
ANSI/IEEE C37.2
device number
25
IP15111-1 v1
SEMOD171992-5 v9
293