CIRCUIT INTERRUPTER PROVIDING PROTECTION AND WAVEFORM CAPTURE FOR HARMONIC ANALYSIS

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 sa mpling technique based upon pairs of samples spaced 90 electrical degrees apart wit h a pattern of delays between pairs is used to digitize the waveform...

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Bibliographic Details
Main Authors ENGEL, JOSEPH CHARLES, JOHNSON, RICHARD ARTHUR, SALETTA, GARY FRANCIS
Format Patent
LanguageEnglish
French
Published 23.09.2003
Edition6
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary: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 sa mpling technique based upon pairs of samples spaced 90 electrical degrees apart wit h a pattern of delays between pairs is used to digitize the waveforms in the protected e lectrical 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 condit ion is exceeded. The percentage age total harmonic distortion, and per harmonic dis tortion for harmonics, up to and including the 27th are sequentially presented on a disp lay on the front panel of the circuit breaker and can be transmitted along with the raw waveform data to a remote processor.
Bibliography:Application Number: CA19952165929