ABB Relion 670 Series Applications Manual page 320

Section 15
Control
CloseAngleMax . Table
with
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
Table 53:
tBreaker [s] (max settable value)
with CloseAngleMax = 15 degrees
[default value]
The reference voltage can be phase-neutral L1, L2, L3 or phase-phase L1-L2, L2-L3, L3-L1 or
positive sequence (Require a three phase voltage, that is UL1, UL2 and UL3) . By setting the
phases used for SESRSYN, with the settings
SelPhaseLine2 , a 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
15.1.2.2 Synchrocheck
The main purpose of the synchrocheck 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 function block includes both the synchrocheck function and the energizing function
to allow closing when one side of the breaker is dead. SESRSYN function also includes a built in
voltage selection scheme which allows adoption to various busbar arrangements.
314
53 below shows the maximum settable value for
CloseAngleMax needs to be used.
Dependencies between tBreaker and SlipFrequency with different CloseAngleMax values
tBreaker [s] (max settable value) with
CloseAngleMax = 30 degrees [max
value]
0.040
0.050
0.080
0.200
0.400
0.800
1.000
PhaseShift setting.
Some restrictions when using CBConfig selections 1½ bus CB, 1½ bus alt.CB
and Tie CB are described in table
Technical manual. Such restriction are applicable only when a power
transformer is connected in the diameter and VT used for synchrocheck
function is located on the other side of the transformer.
Single pole auto-reclosing does not require any synchrocheck since the system
is tied together by two phases.
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SlipFrequency [Hz]
(BusFrequency - LineFrequency)
0.080
0.100
0.160
0.400
0.810
1.000
SelPhaseBus1 , SelPhaseBus2 , SelPhaseLine2 and
Restrictions for CBConfig settings in the
1MRK 511 401-UEN Rev. K
tBreaker when
1.000
0.800
0.500
0.200
0.100
0.080
0.050
0.040
M12309-6 v10
Bay control REC670
Application manual