Functions
Check synchronising
The relay checks that the two part of the
system are in synchronism by measuring
the angle and the slip frequency
between the line voltage and the bus
voltage. Auto-reclose is blocked if these
values exceed the phase angle and slip
frequency settings. Manual closure is
blocked if these values exceed the system
angle and system slip settings.
Selectable undervoltage and differential
voltage measurements are available to
block closure if the line and bus voltages
are not compatible.
To allow the circuit breaker to be closed
onto an uncharged line, live line/ dead
bus, dead line/ dead bus and dead
line/ live bus detectors are included.
These allow reclosure when the voltage
on the line and/ or the bus VT is below a
preset value. |
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