Fault detector for detecting faults in a DC capacitor circuit

Details Fault detector for detecting faults in a DC capacitor circuit Fault detector for detecting faults in a DC capacitor circuit

1987-04-21

1989-02-14

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Capacitor protection

361 17, 324 60C, H02H 716

Patent

active

048050636

ABSTRACT:
A fault detector for detecting faults in a DC capacitor circuit connected to the DC buses of an inverter circuit using semiconductor device for converting direct current into alternating current to suppress the voltage pulsation and comprising a plurality of parallel-connected capacitor circuits each having a plurality of series-connected DC capacitors. The fault detector comprises a comparison means connected to the junctions of the series-connected DC capacitors to compare the respective potentials of the parallel-connected capacitor circuits, and detects the short-circuit and time-aging of the DC capacitors of the parallel-connected capacitor circuits rapidly on the basis of the output signal of the comparison means.

REFERENCES:
patent: 2550119 (1951-04-01), Marborg et al.
patent: 3143687 (1964-08-01), Hiertberg et al.
patent: 4093915 (1978-06-01), Briefer
patent: 4278971 (1981-07-01), Yasui et al.
patent: 4401942 (1983-08-01), Renz
patent: 4419621 (1983-12-01), Becker et al.
Electric Lighting & Facilities in Railways, "Electric Power and Railroad", vol. 28, No. 6 (278), May 25, 1978, pp. 29-32.

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