German translation: Oberschwingungs/test/prüfung/messung
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English to German translations [PRO] Tech/Engineering - Mathematics & Statistics / Protective relay tester
English term or phrase:harmonic restraint test
One V/I Generator could be used to do differential or harmonic restraint tests when the voltage channel is converted to a current source. This is useful when the unit only has one V/I Generator, and if the required operating current doesn’t exceed 5 amperes and the restraint current doesn’t exceed 15 amperes.
Explanation: It appears that this comes about in transformers with on-line tap changers where the power in does not match the power out and the protective relay thinks there is a fault somewhere. In changing the tap, harmonics are created that could simulate such conditions. This Sperrfilter is put into the circuit to mask these transient symptoms so the relay does not trigger unless the symptoms continue for a certain period of time.