KUC755AE106 3BHB005243R0106 ABB Portal crane power exciter control module

KUC755AE106 3BHB005243R0106 ABB Portal crane power exciter control module

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When the calculated positive phase-sequence voltage value U1s falls below the set

start value of the stage U1<, the stage generates a start signal after a ~ 50 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. The

stage is reset in 70 ms after the calculated positive phase-sequence voltage value has

exceeded the set start value of the stage.

The positive phase-sequence voltage is calculated as follows:

U1s = U aU a U 12 +× + × 23

2

31

3 (2)

a =1∠ 120°

a

2 = 1∠ -120°

On a symmetrical network, this formula scales the positive phase-sequence value to

the same amplitude as the measured voltage signal.

Stage U<

0.15 × Un. In addition, the tripping of stage U

U<

Stage U1