ABB Relion 670 Series Applications Manual page 280

Section 14
Control
The synchronizing function compensates for the measured slip frequency as well as the circuit
breaker closing delay. The phase angle advance is calculated continuously. The calculation of the
operation pulse sent in advance is using the measured
prevent incorrect closing pulses, a maximum closing angle between bus and line is set with
CloseAngleMax . Table
CloseAngleMax is set to 15 or 30 degrees, at different allowed slip frequencies for synchronizing.
To minimize the moment stress when synchronizing near a power station, a narrower limit for the
CloseAngleMax needs to be used.
Table 32:
tBreaker [s] (max settable value)
CloseAngleMax = 15 degrees
with
[default value]
The reference voltage can be phase-neutral A, B, C or phase-phase A-B, B-C, C-A or positive
sequence (Require a three phase voltage, that is VA, VB and VC) . By setting the phases used for
SESRSYN, with the settings
compensation is made automatically for the voltage amplitude difference and the phase angle
difference caused if different setting values are selected for the two sides of the breaker. If
needed an additional phase angle adjustment can be done for selected line voltage with the
PhaseShift setting.
14.1.2.2 Synchronism check
The main purpose of the synchronism check function is to provide control over the closing of
circuit breakers in power networks in order to prevent closing if conditions for synchronism are
not detected. It is also used to prevent the re-connection of two systems, which are divided after
islanding and after a three pole reclosing.
SESRSYN (25) function block includes both the synchronism check function and the energizing
function to allow closing when one side of the breaker is dead. SESRSYN (25) function also
includes a built in voltage selection scheme which allows adoption to various busbar
arrangements.
274
32 below shows the maximum settable value for
Dependencies between tBreaker and SlipFrequency with different CloseAngleMax values
0.040
0.050
0.080
0.200
0.400
0.800
1.000
SelPhaseBus1 , SelPhaseBus2 , SelPhaseLine2 and SelPhaseLine2 , a
Single pole auto-reclosing does not require any synchronism check since the
system is tied together by two phases.
© Copyright 2017 ABB. All rights reserved
SlipFrequency and the set tBreaker time. To
tBreaker [s] (max settable value) with
CloseAngleMax = 30 degrees [max
value]
0.080
0.100
0.160
0.400
0.810
1.000
1MRK 511 401-UUS F
tBreaker when
SlipFrequency [Hz] (BusFrequency
- LineFrequency)
1.000
0.800
0.500
0.200
0.100
0.080
0.050
0.040
Bay control REC670
Application manual
M12309-6 v10