Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1977-01-06
1978-11-14
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
322 32, 322 58, 328134, 340658, 361111, 361113, 307129, H02H 326
Patent
active
041258843
ABSTRACT:
Apparatus for detecting the presence of subsynchronous current components in an electrical generating or transmission system is disclosed. Input signals, representative respectively of line voltage and current, are conditioned and initially filtered to suppress high frequency noise. The input voltage signal is further limited and filtered to produce a constant amplitude, sinusoid reference. The input signals are then multiplied to yield the subsynchronous current signal components, if any, which undergo further filtration by a bandpass filter circuit. In addition, the detection apparatus is provided with circuit means for insuring protection against overvoltage and current surge conditions.
REFERENCES:
patent: 3654516 (1972-04-01), Traversi
patent: 3886449 (1975-05-01), Wolfinger
patent: 3999115 (1976-12-01), South et al.
Lackey D. R.
Salce Patrick R.
Westinghouse Electric Corp.
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