Electric filter equipment

Details Electric filter equipment Electric filter equipment

1981-06-16

1983-12-06

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

333 17R, 361113, G08B 2100, H03H 710

Patent

active

044196601

ABSTRACT:
An electric filter, for example an harmonic filter in an HVDC convertor, has, in addition to the main filter, a low power model filter having the same frequency characteristic as the main filter. The model filter is supplied with a voltage which is a scaled-down version of the voltage appearing across the main filter. The currents in the main and model filters are sensed at corresponding places in the filters and compared. If a deviation occurs between the sensed currents in the main and model filters, an indicating signal is generated which indicates a deterioration in the performance of the main filter.

REFERENCES:
patent: 2285912 (1942-06-01), De Monte
patent: 2824296 (1958-02-01), Hecht et al.
patent: 3210671 (1965-10-01), Lofting
patent: 4104687 (1978-08-01), Zulaski

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