Absorption circuit

Details Absorption circuit Absorption circuit

1985-12-17

1987-12-01

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333167, 333176, 333181, 361113, H03H 701, H03H 706

Patent

active

047107359

ABSTRACT:
Absorption circuits (C.sub.f,L.sub.F) are used for filtering out unwanted harmonic currents in electric lines (R, S, T), particularly for rated power within the range of 1 MVar-1 GVar, for example in the case of high-voltage direct-current transmission systems. So that the absorption circuit holds the virtual capacitance of the filter capacitor circuit (C.sub.f) at its rated value at a tuned frequency even when one or more capacitors (C11, C21, C12, C22) fail, a compensating choke (L) is provided in the cross branch of an "H" circuit of the capacitors. The capacitance of each capacitor (C11 . . . C22) is equal to the total capacitance C of the filter capacitor circuit (C.sub.f). The inductance L of the compensating choke (L) is equal to 1/.omega..sup.2 C, where .omega.=angular frequency of the harmonic. The compensating choke (L) can be designed for 5%-10% of the power of the filter choke (L.sub.F). Instead of in the cross branch, the compensating choke can also be connected between two series-connected capacitors (C12, C 22) in series with these capacitors.

REFERENCES:
patent: 3248607 (1966-04-01), Lemens
patent: 3290578 (1966-12-01), Ainsworth
patent: 3555291 (1971-01-01), Dewey
patent: 3813593 (1974-05-01), Tice et al.
Uhlmann-"Power Transmission by Direct Current", Springer-Verlag, Berlin, Heidelberg, New York, 1975, pp. 368-379.

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