Closing resistor switch for gas insulated circuit breaker
AssigneeAllis-Chalmers Corporation
InventorGerardus J. Meinders
Life of this patent
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Abstract
A high voltage gas insulated circuit breaker in which a resistance shunts the main interrupter contacts to control the magnitude of the surge voltage experienced when the interrupter is closing. The resistance includes a resistor switch comprising a plurality of stacks of resistor segments connected in parallel. The smaller surface area of the segments tends to resist cracking due to mechanical thermal stresses and provides a higher resistivity thereby being capable of withstanding more voltage. The parallel stacks of resistor segments provides for a more compact resistor switch without sacrificing the basic operational requirement.
Claims9
In a gas insulated circuit breaker having an enclosure containing an insulating gas at a relatively low pressure;
- an interrupter within said enclosure and having a pair of contacts movable relative to each other between open and closed positions;
- a plurality of independent resistance means connected in parallel with each other, each of said plurality of resistance means including a plurality of individual resistance elements arranged in stacked array, each stack of individual resistance elements being biased into intimate engagement, said stacks of resistance elements being enclosed in a housing;
- switch means operable when actuated to a closed position to connect said resistance means in parallel with said interrupter contacts;
- and,
- operating means operably connected to close said interrupter contacts and to actuate said switch means to a closed position just prior to the closing of said interrupter contacts.
In a resistor switch,
- a cylindrical switch housing of an insulating material;
- a first metallic end member secured to one end of said housing;
- a second metallic end member secured to the opposite end of said cylindrical housing;
- a contact rod carried by said first metallic end member for movement between open and closed positions;
- a cylindrical resistor housing disposed within said cylindrical housing;
- a plurality of stacks of resistor elements disposed within said resistor housing;
- a stationary contact carried by said resistor housing and connected to all of said stacks of resistor elements;
- and,
- individual conductor means connecting each of said stacks of resistor elements to said second metallic end member;
- whereby a conductive circuit will be established from said second metallic end member through said parallel connected resistor stacks to said first end member upon movement of said contact rod to closed position.
Dependencies are inferred from the claim text.