ABB Relion 670 Series Applications Manual page 279

1MRK 511 401-UUS F
Section 14
14.1 Synchronism check, energizing check, and synchronizing
SESRSYN (25)
14.1.1 Identification
Function description
Synchrocheck, energizing check, and
synchronizing
14.1.2 Application
14.1.2.1 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 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:
• The voltages V-Line and V-Bus are higher than the set values for
VHighLineSynch of the respective base voltages GblBaseSelBus and GblBaseSelLine .
• The difference in the voltage is smaller than the set value of
• The difference in frequency is less than the set value of
value of
and the value of
synchronism check function. The bus and line frequencies must also be within a range of ±5
Hz from the rated frequency. When the synchronizing option is included also for autoreclose
there is no reason to have different frequency setting for the manual and automatic reclosing
and the frequency difference values for synchronism check should be kept low.
• The frequency rate of change is less than set value for both V-Bus and V-Line.
• The difference in the phase angle is smaller than the set value of
• The closing angle is decided by the calculation of slip frequency and required pre-closing time.
Bay control REC670
Application manual
Control
IEC 61850
identification
SESRSYN
FreqDiffMin . If the frequency is less than FreqDiffMin the synchronism check is used
FreqDiffMin must thus be identical to the value FreqDiffM resp FreqDiffA for
© Copyright 2017 ABB. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
25
sc/vc
SYMBOL-M V1 EN-US
VHighBusSynch and
VDiffSynch .
FreqDiffMax and larger than the set
CloseAngleMax .
Section 14
Control
IP14558-1 v4
M14889-1 v4
IP15111-1 v1
SEMOD171992-5 v9
273