5.5.3 Vector mismatch
This alarm alerts the operator to a vector mismatch during synchronisation.
The alarm is based on the difference between the phase angles on either side of the breaker,
as measured by the controller. The alarm is activated when synchronisation is ON and the
difference in the phase angles is more than the set point.
On the diagram to the right, the vector diagram for the busbar is black, and the mismatch that is
allowed by default is green. The vector diagram for the source is red. L2 is outside the allowed
window.
Configure the parameters under Configure > Parameters > Breakers > [Breaker] monitoring > Vector mismatch.
Table 5.30
Default parameters
Parameter Range Default
Set point 1 to 20 degrees 20 degrees
Delay 5 s to 1 min
10 s
DEIF recommends that this delay is lower than the genset Breaker synchronisation failure
delay.
Enable Not enabled, Enabled Enabled
Alarm action Warning
Frequency-based inhibit
The Vector mismatch alarm is inhibited outside of the synchronisation window. That is, it is inhibited if the frequency from the source
is more than the Delta frequency min. below the busbar frequency, or the Delta frequency max. above the busbar frequency. These
parameters are defined under Synchronisation settings.
5.5.4 Breaker opening failure
This alarm alerts the operator to a breaker open failure if a breaker open feedback is present.
The alarm is based on the breaker feedback signal, which is a digital input to the controller. The
alarm timer starts when the controller sends the signal to open the breaker. The alarm is
activated if the breaker feedback does not change from Closed to Open within the delay time.
Configure the parameters under Configure > Parameters > Breakers > [Breaker] monitoring > Opening failure. The alarm is
always enabled when at least one breaker feedback is configured. The alarm action is always Latch enabled.
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