Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1984-12-26
1987-01-20
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 91, 361101, 315DIG7, H02H 312
Patent
active
046383956
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 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, such as to protect protecting the source and the L-C circuit, and (ii) control arrangement operative to protect the Varistor from overloading as well as to prevent unnecessary power drain, which control arrangement 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: 4167689 (1979-09-01), Quirke
patent: 4169259 (1979-09-01), Hidler et al.
patent: 4563731 (1986-01-01), Sato et al.
Jennings Derek S.
Pellinen A. D.
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