Method and system for monitoring the condition of a plurality of

Details Method and system for monitoring the condition of a plurality of Method and system for monitoring the condition of a plurality of

1989-04-13

1990-04-17

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electromechanical switching device

340639, 340644, G01R 3102

Patent

active

049183907

ABSTRACT:
A method and system for monitoring the condition of a plurality of electrical devices, particularly electrical switches actuated by sensors, to determine the condition of each and the location of e.g., a malfunctioning device. The electrical devices are connected in parallel across a pair of line conductors. A voltage-dropping element is inserted in series with the line at the input side of each device, and a current-limiting element, passing a fixed current independently of voltage above a predetermined threshold, is inserted in series with the respective device. Initially, a voltage is applied to the line of greater magnitude than the sum of the predetermined threshold and the voltage of the first device, and is sequentially increased in a plurality of steps, while the current passing through the line initially and after each of the voltage steps is measured.

REFERENCES:
patent: 2317030 (1943-04-01), Colvin
patent: 2833983 (1958-05-01), Shaw
patent: 4764884 (1988-08-01), Noyori
IBM Technical Disclosure Bulletin, vol. 13, No. 3, Aug. 1970, Carey et al.

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