Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1989-06-27
1991-05-14
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324525, 324526, 338 27, 174 11R, 340537, G01R 3108, H01B 732
Patent
active
050159585
ABSTRACT:
Detection of events, e.g. liquid leaks and other changes in varibles. The event causes two conductors to become electrically connected, and thus creating a system in which the connection point can be located by measuring the potential drop from one end of one of the conductors (called the locating member) to the connection point. Preferably a fixed current flows through the connection, so that the result is independent of the resistance of the connection. The locating member can be a continuous resistive wire, preferably coated with a conductive polymer; such a locating member can form part of a sensor cable in which the elongate components of the circuit are in a wrapped configuration, or part of a cable in which the conductors are separated by a member shaped to prevent capillary action of a liquid from connecting the conductors. Alternatively the locating member comprises a plurality of discrete resistors. Preferably the system is arranged so that the sensitivity of the system is not dependent on the location of the fault and/or is such that only connections within a certain range of resistance will activate the system. The voltage drop is preferably calculated by comparing it to the voltage drop over a resistor of known size. Particular event-sensitive connection means are preferably employed for the detection of hydrocarbons and for the detection of acids.
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Bonomi Mauro
Brooks Peter L.
Frank Louis M.
Hauptly Paul D.
Lahlouh John
Burkard Herbert G.
Eisenzopf Reinhard J.
Harvey Jack B.
Raychem Corporation
Richardson Timothy H. P.
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