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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Main Authors | , , |
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Format | Patent |
Language | English French |
Published |
23.09.2003
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Edition | 6 |
Subjects | |
Online Access | Get full text |
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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. |
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Bibliography: | Application Number: CA19952165929 |