Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Patent
1986-07-24
1987-09-22
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
200144AP, H01H 3316
Patent
active
046959181
ABSTRACT:
A pre-insertion inductor arrangement is provided for a circuit interrupting 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 the insertion 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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Jennings Derek S.
Lapacek James V.
Pellinen A. D.
S&C Electric Company
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