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Operation Manual 37107F
MFR 3 - Multi Function Relay
© Woodward
Page 91/165
Synchronization
Parameter
99
Synchronize
df max 0.00Hz
Synch.: max. permissible differential frequency (pos. slip)
0.02 to 0.49 Hz
This is the upper frequency differential limit for synchronization. The prerequisite
for a breaker closure command is that the positive frequency differential be lower
than the configured value. A positive value corresponds to positive slip. This
means that the generator frequency is higher than the busbar frequency for syn-
chronizing the GCB or the bus bar frequency is higher than the mains frequency for
synchronizing the MCB.
Parameter
100
Synchronize
df min -0.00Hz
Synch.: max. permissible differential frequency (neg. slip)
0.00 to -0.49 Hz
This is the lower frequency differential limit for synchronization. The prerequisite
for a breaker closure command is that the negative frequency differential be lower
than the configured value. A negative value corresponds to negative slip. This
means that the generator frequency is lower than the busbar frequency for synchro-
nizing the GCB or the bus bar frequency is lower than the mains frequency for syn-
chronizing the MCB.
Parameter
101
Synchronize
dV max 00.0%
Synch.: max. permissible differential voltage
00.1 to 15.0 %
The measured voltage differential between the two systems to be connected cannot
exceed the percentage value configured here for a connect command to be issued.
Parameter
102
Synchronize
time pulse>0.00s
Synch.: pulse time
0.02 to 0.26 s
The duration of the connect pulse can be adjusted for the switching element. This
applies to synchronization and dead bus start closure.
Parameter
103
Closing time
GCB 000ms
Synch.: inherent breaker time GCB
40 to 300 ms
The time configured here permits the control to compensate for the inherent delay
in the GCB from the time it receives the command to close and the contacts are
closed. This permits the controller to issue the closure command independent of the
differential frequency so that the GCB contacts close at the synchronous point.
Parameter
104
closing time
MCB 000ms
Synch.: inherent breaker time CB
40 to 300 ms
The time configured here permits the control to compensate for the inherent delay
in the MCB from the time it receives the command to close and the contacts are
closed. This permits the controller to issue the closure command independent of the
differential frequency so that the MCB contacts close at the synchronous point.
Parameter
105
Autom.breaker
deblocking ON
Synch.: breaker de-blocking
ON/OFF
ON
................ Prior to each connect pulse, a "Command: open GCB" or "Com-
mand: open MCB" is issued for 1 second. A connect signal is then is-
sued until the circuit breaker is closed.
OFF
.............. Circuit breaker initialization on closing is carried out only via the
connect pulse. No open pulse is issued prior to the close pulse.