Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Patent
1987-05-18
1989-04-04
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
361 11, H02H 900
Patent
active
048191205
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 applications requiring tuning reactors and current-limiting 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 predetermined 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.
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IEEE Paper No. 865M 419-6, "Capacitor Switching and Transformer Transients", by B. S. Bayless, J. D. Selman, D. E. Truax, and W. E. Reid, 8 pages, 1986.
Jennings Derek S.
Lapacek James V.
Pellinen A. D.
S&C Electric Company
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