KUC711AE101 3BHB004661R0101 ABB Excitation controller module (CPU module)

KUC711AE101 3BHB004661R0101 ABB Excitation controller module (CPU module)

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Undervoltage protection based on conventional voltage

measurement

Both the low-set and the high-set undervoltage stage can independently be set to

start and trip when one of the three voltages or all the voltages fall below the set start

value. By default, the low-set undervoltage stage operates when one of the three

voltages fall below the set start value and the high-set undervoltage stage operates

when all the voltages fall below the set start value. The selection is made in SGF4/7

and SGF4/8.

When the phase-to-phase voltage values fall below the set start value of the low-set

stage, U<, the stage generates a start signal after a ~ 80 ms’ start time. When the set

operate time at definite-time characteristic or the calculated operate time at IDMT

characteristic elapses, the stage generates a trip signal.

Stage U

characteristics), tr<, for reset coordination with existing electromechanical relays or

for reducing fault clearance times of recurring, transient faults. If stage U

started and the phase-to-phase voltages exceed the set start value of the stage, the

start of the stage remains active for the set resetting time. If the phase-to-phase

voltages fall below the set start value again while the timer is running, the timer is

cleared and the start of the stage remains active.

Consequently, the set resetting time ensures that when the stage starts because of

voltage drops, it is not immediately reset. If stage U

is reset in 70 ms after the phase-to-phase voltages have fallen below 0.15 × Un.

However, if stage U

exceeded the set start value of the stage, the stage is reset when the set resetting time

has expired.

Stage U