ABB Network Partner AB
- 31
Page
Function:
1 Application
1.1 Synchronism check
The synchro-check function is used for controlled closing of a circuit in an
interconnected network. When used, the function gives an enable signal at
satisfied voltage conditions across the breaker to be closed. When there is a
parallel circuit established, the frequency is normally the same at the two
sides of the open breaker. At power swings, e.g. after a line fault, an oscillat-
ing difference can appear. Across the open breaker, there can be a phase
angle and a voltage amplitude difference due to voltage drop across the par-
allel circuit or circuits. The synchro-check function measures the difference
between the U
-
line and the U-bus, regarding voltage (UDiff), phase angle
(PhaseDiff), and frequency (FreqDiff). It operates and permits closing of the
circuit breaker when these conditions are simultaneously fulfilled.
• The voltages U-line and U-bus are higher than the set value for
UHigh of the rated voltage U
r
/sqr3.
• The differences in the voltage and phase angles are smaller than the
set values of UDiff and PhaseDiff.
• The difference in frequency is less than the set value of FreqDiff.
The bus frequency must also be within a range of ±5 Hz from the
rated frequency.
The function can be used as a condition to be fulfilled before the breaker
is closed
at manual closing and/or together with the auto-recloser func-
tion.
Fig. 1
Synchronism check
The voltage circuits are arranged differently depending on the number of
synchro-check functions that are included in the control terminal.
SYN 1
UHigh>70-100% Ur
UDiff<5-50% Ur
PhaseDiff<5-75
o
FreqDiff<50-300mHz
Fuse fail
Fuse fail
U-Line
Line
reference
voltage
(X80167-1)
U-Line
U-Bus
5
Synchronism and energizing
check for double circuit breakers
and voltage selection
1MRK 580 167-XEN
Version 1.0-00
October 1996
Optional
Summary of Contents for REC 561
Page 19: ...ABB Network Partner AB Introduction REC 561 Version 1 0 00 1MRK 580 146 XEN Page 2 14 ...
Page 31: ...ABB Network Partner AB Requirements and basic technical data REC 561 Version 1 0 00 Page 2 26 ...
Page 49: ...ABB Network Partner AB Page IV ...
Page 121: ...ABB Network Partner AB Menu tree Appendix Version 1 0 00 1MRK 580 158 XEN Page 3 72 ...
Page 139: ...ABB Network Partner AB Terminal identification Version 1 0 00 1MRK 580 160 XEN Page 4 4 ...
Page 143: ...ABB Network Partner AB Activation of setting group Version 1 0 00 1MRK 580 162 XEN Page 4 8 ...
Page 175: ...ABB Network Partner AB Configurable logic Version 1 0 00 1MRK 580 161 XEN Page 4 40 ...
Page 385: ...ABB Network Partner AB Apparatus control Version 1 0 00 1MRK 580 150 XEN Page 6 100 ...
Page 495: ...ABB Network Partner AB Interlocking Version 1 0 00 1MRK 580 151 XEN Page 6 210 ...
Page 515: ...ABB Network Partner AB Event function Version 1 0 00 1MRK 580 140 XEN Page 6 230 ...
Page 519: ...ABB Network Partner AB Page IV ...
Page 561: ...ABB Network Partner AB Time synchronisation Version 1 0 00 1MRK 580 135 XEN Page 7 42 ...
Page 569: ...ABB Network Partner AB Internal events Version 1 0 00 1MRK 580 134 XEN Page 7 50 ...
Page 599: ...ABB Network Partner AB Index Version 1 0 01 1MRK 580 175 XEN Page 8 6 ...
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