Table 24: Selection of phase shift for different combinations of SelPhaseBus and
SelPhaseLine
SelPhase Bus SelPhase Line PhaseShift in degrees
Phase L1 or Positive sequence Phase L1 or Positive sequence 0
Phase L1 or Positive sequence Phase L2 180
Phase L2 Phase L1 or Positive sequence 180
Phase L2 Phase L2 0
12.1.2.2 Synchrocheck
M12309-6 v10
The main purpose of the synchrocheck
function is to provide control over closing
circuit breakers in power networks. The purpose for providing control is to prevent
the closing if the conditions of synchronism are not detected. It is also used to
prevent re-connection of two systems, which are divided after islanding/after a two
pole reclosing.
Sometimes first shot in the auto-reclosing cycle shall be performed
without using synchrocheck for railway applications. For such
cases high-speed shot within the auto-reclosing function shall be
used.
SESRSYN function block includes both the synchrocheck and the energizing
features. The energizing function allows closing when one side of the breaker is
dead.
IEC16000121 V1 EN-US
Figure 65: Two interconnected power systems
Figure
65 shows two interconnected power systems. The cloud means that the
interconnection can be further away, that is, a weak connection through other
stations. The need for a check of synchronization increases if the meshed system
decreases since the risk of the two networks being out of synchronization at manual
or automatic closing is greater
.
The synchrocheck function measures the conditions across the circuit breaker and
compares against the set limits. Output is generated only when all measured
conditions are within the respective set limits simultaneously. The check consists
of:
1MRK 506 375-UEN A Section 12
Control
Railway application RER670 2.2 IEC 213
Application manual
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