Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-11-29
1992-03-03
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
337168, 324550, G08B 2100
Patent
active
050936573
ABSTRACT:
A fused cutout for a power distribution system, which cutout includes an insulating member (2) having two opposed ends and a recess located between the two opposed ends, a fuse (12) defining a current path and having an element for interrupting the current path when current flowing through the path exceeds a selected value, a first conductive support structure (6) connected at a first end of the insulating member (2), conductively connected to a first end of the current path and connectable to a source of electrical power (14), a second conductive support structure (8) connected at a second end of the insulating member (2), conductively connected to a second end of the current path and connectable to a consumer of electrical power (16), each conductive support structure (6,8) producing an electric field when connected to the source of electrical power, and a mounting bracket assembly (4) for supporting the fused cutout and including a conductive member (30) secured in the recess of the insulating member (2). An electric field detector including at least one conductive electrode (42) is disposed in the recess and spaced from the conductive member (30) for generating a voltage dependent at least on the intensity of the electric field originating from the second conductive support structure (8), and a monitoring circuit (70-84) is connected to the detector for monitoring the voltage generated by the detector and providing an output signal when the value of that voltage corresponds substantially to that produced when no electric field originates at the second conductive support structure (8).
REFERENCES:
patent: 4398187 (1983-08-01), Fukushima et al.
patent: 4661807 (1987-04-01), Panaro
Bishop Martin T.
Milone David M.
ABB Power T&D Company
Jackson Jill
Ng Jin F.
Rossi A. J.
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