Protective Elements
Commissioning: Undervoltage Protection [27]
This test can be carried out similar to the test for overvoltage protection (by using the related undervoltage values).
Please consider the following deviations:
For testing the threshold values the test voltage has to be decreased until the relay is activated.
For detection of the fallback value, the measuring quantity has to be increased so to achieve more than
(e.g.) 103% of the trip value. At 103% of the trip value the relay is to fall back at the earliest.
890 MCDGV4 DOK-HB-MCDGV4-2E
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