ABB REG670 - Section 15 Control

Section 15 Control
15.1 Synchrocheck, energizing check, and synchronizing
SESRSYN
15.1.1 Identification
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
25
15.1.2 Application
15.1.2.1 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
synchrocheck function is used.
The synchronizing function measures the difference between the U-Line and the U-
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:
• The voltages U-Line and U-Bus are higher than the set values for
UHighBusSynch and UHighLineSynch of the respective base voltages
GblBaseSelBus and GblBaseSelLine.
• The difference in the voltage is smaller than the set value of UDiffSynch.
• The difference in frequency is less than the set value of FreqDiffMax and larger
than the set value of FreqDiffMin. If the frequency is less than FreqDiffMin the
synchrocheck is used and the value of FreqDiffMin must thus be identical to the
value FreqDiffM resp FreqDiffA for synchrocheck function. The bus and line
1MRK 502 071-UEN - Section 15
Control
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 479
Application manual