Filter input protection

Details Filter input protection Filter input protection

H - Electricity

02

H

348/26, 317/12.9

H02H 7/16 (2006.01) H02H 3/16 (2006.01) H02H 7/00 (2006.01)

Patent

CA 1147384

ABSTRACT A system for protecting a transmission network from short circuit conditions at the input of filter circuitry connected to a single phase or a multiple phase transmission network. A signal is produced which corresponds to the current flowing from the transmission network to the filter circuit. The signal is filtered by a low-pass filter for attenuating its harmonic con- tent and converted into a direct current signal which corresponds in amplitude to the fundamental frequency component of the current flowing to the filter circuit. Means are provided for disconnecting the filter circuit from the transmission network when the amplitude of the direct current signal exceeds a predetermined threshold level.

356610

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