Boots – shoes – and leggings
Patent
1993-05-28
1995-06-27
Voeltz, Emanual T.
Boots, shoes, and leggings
364481, 364482, 364493, 364492, 361 93, 361 80, 361 86, 361 88, G01R 3108, G06F 1520
Patent
active
054285496
ABSTRACT:
A fault location system comprises current and voltage transducers 10, filters 12, and a multiplexor 14, the latter outputting an interleaved stream of analog phase current and voltage signal samples, as well as neutral current samples. The analog multiplex output by the multiplexor 14 is digitized by an analog-to-digital converter 16. The output of the analog-to-digital converter 16 is fed to a digital signal processing block 18. The multiplexor necessarily introduces a time-skew between the successive samples for each channel and also introduces a time-skew between the respective channels. The system corrects the sample-to-sample time-skew for each channel, and then derives current and voltage phasors from the time-skew corrected data. Thereafter, the phasors are adjusted to correct for channel-to-channel phase-skew. In this manner, the digital signal processing block produces phasor data for each of the sampled channels. The phasor data is stored in a memory 20. The phasor data in the memory is fed to a CPU board 22, which includes a microprocessor 22-1, random access memory 22-2, and ROM 22- 3. The ROM contains program code controlling the microprocessor in performing fault typing, fault location, and reporting functions.
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ABB Power T&D Company
Tran Alan
Voeltz Emanual T.
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