Fault isolator for electric utility distribution systems

Details Fault isolator for electric utility distribution systems Fault isolator for electric utility distribution systems

1981-06-08

1983-01-25

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3102

Patent

active

043706096

ABSTRACT:
A device for locating faults on the lines of electrical power distribution systems, including generally a variable impedance means adapted for connection in series with an electrical power line, and means for switching such variable impedance means between a first low impedance value when an initial current I.sub.1 of predetermined level flows on the power line for a predetermined period of time to enable detection of a fault condition, and a second high impedance value which limits the flow of current to a low level I.sub.2. A meter or other indicating device provides a reading of the current I.sub.1 to determine if a fault condition exists. In this fashion, the fault locator device limits both the magnitude and the time duration of the current when testing for a fault, so as not to adversely effect any system components.

REFERENCES:
patent: 3895264 (1975-07-01), Kirilloff
patent: 4227145 (1980-10-01), Bonikowski et al.

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