H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 3/00 (2006.01) H02H 3/08 (2006.01) H02H 3/52 (2006.01) H03H 7/00 (2006.01) H02H 5/10 (2006.01)
Patent
CA 2198412
The present invention relates to protection circuit and method for the EMI/RFI suppression system (2) of such a five-conductor electrical system in which the neutral conductor (N) is provided with a bandstop-type filter circuit (2) for the suppression of a harmonic interference current component. According to the invention, on the neutral conductor (N) is placed a current transformer (CT) having over its secondary a resistive branch (R1), and in parallel therewith, a filter branch (5) comprising a bandpass filter (LC) tuned to the fundamental frequency of said neutral-conductor filter circuit (2) and said filter branch (5) having in series with said bandpass filter branch (LC) a switch element (4) suitable for short-circuiting said neutral-conductor filter circuit (2) when current in said filter branch (5) exceeds a preset upper limit level.
Abb Control Oy
Abb Oy
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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