H - Electricity – 02 – H
Patent
H - Electricity
02
H
323/28, 323/6
H02H 9/00 (2006.01) H01H 33/16 (2006.01)
Patent
CA 1308437
ABSTRACT An impedance arrangement is provided for use in a high-voltage circuit. For example, the impedance arrangement is useful in a circuit which includes reactance elements and a high-voltage circuit-switching device. The impedance arrangement limits transient inrush current and/or voltages in a first frequency range which occur in the circuit during closure of the circuit-switching device and damps transients in a second frequency range which occur in the circuit during opening of the circuit- switching device. The impedance arrangement is also useful in applica- tions requiring tuning reactors and current-limiting reactors to limit abnormal power-frequency currents, harmonics, transients, and/or high- frequency inrush currents. The impedance arrangement functions predominantly as an inductive impedance over a first frequency range; e.g., corresponding to the frequencies of transients encountered during the closing of a circuit-switching device. Additionally, the impedance arrangement functions predominantly as a resistance over a second frequency range which is higher than the first frequency range; e.g., corresponding to the frequencies of transient conditions on a power system such as are encountered during the opening of the circuit- switching device. The impedance arrangement comprises a first winding having a first predetermined inductance and a second winding connected in parallel with the first winding. The second winding has a second pre- determined inductance and a second predetermined resistance. The second winding is wound with respect to the first winding in an opposite sense to the first winding and so as to define a predetermined mutual inductance between the first and second inductances.
565146
Osler Hoskin & Harcourt Llp
S. & C. Electric Company
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