Overcurrent trip device comprising the detection of the waveform of a current to be monitored
The invention relates to a circuit breaker (1) comprising an overcurrent trip device (4) with a protective module, (6), whose long time delay is influenced by the proportion of harmonic waves in the current to be monitored. To control the dependency of the trip delay on the harmonic wave content, in...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | The invention relates to a circuit breaker (1) comprising an overcurrent trip device (4) with a protective module, (6), whose long time delay is influenced by the proportion of harmonic waves in the current to be monitored. To control the dependency of the trip delay on the harmonic wave content, invention is provided with an adjustment device (9), by means of which a user determines the parameters (A) and (B). Parameter (A) is a limiting value for the harmonic wave content of the current. If said limiting value is exceeded, the trip delay is reduced. The degree of dependency of the trip delay on the harmonic wave content is selected by the additional parameter (B). |
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