Pre-insertion inductor arrangement

Details Pre-insertion inductor arrangement Pre-insertion inductor arrangement

H - Electricity

01

H

306/327

H01H 3/02 (2006.01) H01H 33/16 (2006.01)

Patent

CA 1295632

ABSTRACT A pre-insertion inductor arrangement is provided for a circuit inter- rupting device or high voltage switch to reduce audible and electrical noise and to limit transient inrush current and/or voltages upon closing of the circuit by the circuit interrupting device or high voltage switch. The arrangement provides theinsertion of the inductor for a plurality of cycles of the source frequency and thus does not require precise timing. The pre-insertion inductor does not require the use of a stack of resistor blocks or cakes of the prior art. Further, since the pre-insertion inductor has relatively low losses, the energy dissipation requirements of the pre-insertion inductor are significantly less than for pre-insertion resistors. Additionally, since the pre-insertion inductor is not continuously in the circuit, there is no requirement to carry continuous load or fault current or to accomodate losses on a continuous basis. Thus, an effective inductance for the pre-insertion inductor can be achieved in a desirable configuration having compact dimensions. In a specific embodiment, the pre-insertion inductor arrangement inserts the inductance between a switch blade and a switch contact during the closing movement of the switch blade. A conducting arm arrangement extends radially from the switch blade and upon movement of the switch blade the conducting arm arrangement is moved into juxtaposition with a conductor connected to the pre-insertion inductor assembly. The pre-insertion inductor assembly is mounted on and to one side of the stationary switch contact. The pre-insertion inductor assembly is connected in series with the switch blade and limits the transient inrush current and/or voltages incident to the closing of the switch.

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