Method and apparatus for detecting ground faults in a shielded h

Details Method and apparatus for detecting ground faults in a shielded h Method and apparatus for detecting ground faults in a shielded h

1998-05-22

2000-08-22

Paschall, Mark

Electric heating

Heating devices

With current connection and/or disconnection means

219213, 219549, 219481, 219494, 219505, 361 42, 340580, H05B 102

Patent

active

061076112

ABSTRACT:
A reflector assembly in a satellite system includes a reflector having a reflecting surface. At least one sensor is configured for sensing a temperature of the reflecting surface or moisture associated with the reflecting surface. Each sensor is configured to provide a signal indicative of the sensing. A heater is configured for heating the reflecting surface. The heater includes a heater wire, a layer of insulation substantially surrounding the heater wire, and a conductive shield substantially surrounding the layer of insulation. A ground fault circuit interrupter is coupled with the shield of the heater. The ground fault circuit interrupter is configured for detecting a ground fault condition between the heater wire and the conductive shield and providing a signal indicative thereof. An automatic controller is connected to the at least one sensor. The controller includes heater control circuitry receiving each of the sensor signal and the ground fault circuit interrupter signal. The heater control circuitry selectively controls operation of the heater dependent upon the sensor signal and the ground fault circuit interrupter signal.

REFERENCES:
patent: 4501275 (1985-02-01), Maahs
patent: 4859834 (1989-08-01), Hausler
patent: 4967057 (1990-10-01), Bayless et al.
patent: 5550350 (1996-08-01), Barnes
patent: 5710408 (1998-01-01), Jones
patent: 5811767 (1998-09-01), Wildi

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