Circuit interrupter providing protection and waveform...

Details Circuit interrupter providing protection and waveform... Circuit interrupter providing protection and waveform...

H - Electricity

01

H

H01H 71/00 (2006.01) G01R 21/133 (2006.01) H02H 3/093 (2006.01) H02H 1/00 (2006.01) H02H 3/04 (2006.01) H02H 3/50 (2006.01)

Patent

CA 2165929

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

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