Electricity: electrical systems and devices – Safety and protection of systems and devices – Capacitor protection
Patent
1985-01-23
1990-07-24
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Capacitor protection
361 91, 361101, 315DIG7, H02H 312
Patent
active
049438840
ABSTRACT:
A resonant L-C circuit is series-excited from an AC voltage source and intended to be parallel-loaded with a load that, for some reason or another, may be disconnected or otherwise inoperative. For efficiency reasons, the unloaded circuit Q-factor may be about 50 times higher than the loaded Q-factor; which implies that, if the load were to become inoperative, the power drawn by the L-C circuit from the source, and the voltage/current magnitudes developed in the L-C circuit, would be 50 times larger than when the load is operative. To prevent unnecessary power drain and/or to avoid damage to source and/or circuit components, which damage may occur even if the L-C circuit is left unloaded for but a very brief period, a circuit protector is provided.
This circuit protector comprises: (i) a Varistor to provide an absolute limit on the maximum attainable magnitudes of power, voltage and current, thereby clearly protecting the source and the L-C circuit, and (ii) means operative to protect the Varistor from overloading as well as to prevent unnecessary power drain, which means provides for an intermittently interrupted short circuit across the tank-capacitor in case current flows through the Varistor for more than a very brief period of time. With the tank-capacitor shorted, the resulting power drawn from the source will be of negligible magnitude.
REFERENCES:
patent: 3593063 (1971-07-01), Cavil
patent: 3942069 (1976-03-01), Kaneda
patent: 4644228 (1987-02-01), Nilssen
Pellinen A. D.
Williams H.
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