Monitoring device for detecting faults in an electrical device,

Details Monitoring device for detecting faults in an electrical device, Monitoring device for detecting faults in an electrical device,

1985-04-10

1987-12-15

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

324 60C, 361 15, 361 42, 361 79, G01R 3102, H01G 111, H02H 338

Patent

active

047136049

ABSTRACT:
A monitoring device connected to an LC filter circuit for determining the occurrence of faults therein includes sensors for measuring the voltage drop across the LC filter circuit and the current flow therethrough. The monitoring device includes simulation circuits for estimating the voltage drop and current flow in response to the actual values of the current flow and voltage drop, respectively. In one position of the double-throw switch, the actual value of the current is compared with an estimated value thereof while in another position of the double-throw switch, an estimated value of the voltage drop is compared with the actual value thereof. Differences between the compared values are detected by a multiplicity of Y-connected limit and counting stages activatable by voltages of different magnitudes and directions for indicating different kinds of faults and for selectively disconnecting the LC filter circuit from a power supply network.

REFERENCES:
patent: 4027231 (1977-05-01), Lohrmann
patent: 4401942 (1983-08-01), Renz
patent: 4409542 (1983-10-01), Becker et al.

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