Boots – shoes – and leggings
Patent
1991-12-31
1994-04-19
Teska, Kevin J.
Boots, shoes, and leggings
364483, 364494, 361 20, 361 24, 361 25, 388934, H02H 706
Patent
active
053052340
ABSTRACT:
A synchronous machine is protected from closely spaced instances of excessive field current and an excessive volts/hertz ratio by a control system which models rotor and stator cooling to provide memory of recent periods of excessive heating. Maximum excitation limiting and volts/hertz ratio limiting modules in a microprocessor based automatic voltage regulator for the machine generate time delayed limit signals which override voltage feedback control when the respective parameters exceed threshold values. The limiters each increment a count when the associated threshold value is exceeded and generate the associated limit signal when a predetermined count is reached. The predetermined counts and the counting rates are selected such that the delay intervals are inversely proportional to the amount by which the threshold values are exceeded. The counts are decremented at a rate which models rotor and stator cooling when the respective parameters return below the threshold values. If another event occurs before the count reaches zero, the delay before limiting action is reinitiated is shortened by an amount related to the residual heating.
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patent: 4423362 (1983-12-01), Konrad et al.
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patent: 4788619 (1988-11-01), Ott et al.
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Eichler Kenneth M.
Kasprowicz Gerhard K.
Kimmel Donald S.
Markus David R.
Murray Robert S.
Choi Jae H.
Moran M. J.
Teska Kevin J.
Westinghouse Electric Corp.
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