KUC711AE 3BHB004661R0001 Original imported ABB door unit power supply (actual goods)

KUC711AE 3BHB004661R0001 Original imported ABB door unit power supply (actual goods)

KUC711AE 3BHB004661R0001 Original imported ABB door unit power supply (actual goods)

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When the calculated negative phase-sequence voltage value U2s exceeds the set start

value of the stage U2>, the stage generates a start signal after a 50 ms' start time.

When the set operate time at definite-time characteristics or the calculated operate

time at IDMT characteristics elapses, the stage generates a trip signal. The stage is

reset in 70 ms after the calculated negative phase-sequence voltage value has fallen

below the set start value of the stage.

The negative phase-sequence voltage is calculated as follows:

U2s = U a U aU 12 + × +× 2

23 31

3 (1)

a =1∠ 120°

a

2 = 1∠ -120°

The negative phase-sequence value is scaled to the amplitude of the measured

voltage. On a network with a reverse phase order, the calculated negative phasesequence value has the same amplitude as the measured voltage signal.

Stage U2> can be set to be blocked when one of the measured phase-to-phase

voltages falls below 0.15 × Un. The selection is made in SGF4.

Stage U2> has a fixed drop-off/pick-up ratio of 0.96.

5.1.4.3. Undervoltage protection

The undervoltage protection can be based on either conventional voltage

measurement or the calculated positive phase-sequence voltage.

The low-set undervoltage stage U

The low-set stage can also be used for alarm purposes.

The high-set undervoltage stage U<

* Conventional voltage measurement (U<

* Calculated positive phase-sequence voltage (U1