Electric filter equipment

Details Electric filter equipment Electric filter equipment

G - Physics

01

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324/58.2

G01R 31/00 (2006.01) H02M 1/14 (2006.01) H03H 7/01 (2006.01) H03H 9/46 (2006.01)

Patent

CA 1183214

- 1 - ABSTRACT OF THE DISCLOSURE An electric filter equipment, 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 deterior- ation in the performance of the main filter.

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