Circuit interrupter providing protection and waveform capture for harmonic analysis

摘要: A circuit breaker with a digital trip unit has protection mode and waveform capture of operation. In the mode, an equivalent sampling technique based upon pairs samples spaced 90 electrical degrees apart pattern delays between is used to digitize waveforms in protected system. Synchronous mode. The value each sample monitored transfer made back if threshold indicating overcurrent condition exceeded. percentage age total harmonic distortion, per distortion for harmonics, up including 27th are sequentially presented on display front panel can be transmitted along raw data remote processor.