High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Interposed non-conductor
Patent
1996-05-24
1998-02-10
Hecker, Stuart N.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Interposed non-conductor
218 57, H01H 3382
Patent
active
057171831
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a high-voltage power switch with two contacts and at least one gas outlet for quenching gas heated by the arc generated between the contacts, and a cooling device for cooling the quenching gas, consisting of a metal body with through-holes arranged in the flow path of the quenching gas.
BACKGROUND OF THE INVENTION
Such a high-voltage power switch is known, for example, from a technical article entitled "Development of the type 145 pm self-blast circuit breaker." In the power switch described there, a metal body shaped as a hollow cylinder is shown in the region of the circuit breaker unit, consisting of a metal wire braid. The hot quenching gas can pass through the wire braid and is cooled in the process, which results in rapid dielectric reinforcement of the isolating distance.
Also, DE-U-18 89 068 discloses a high voltage power switch with a cooling body in the flow path of a quenching gas.
It has been shown that such a metal body corrodes easily under the influence of the hot quenching gas, i.e. parts of the metal body are vaporized. After such vaporization, hot quenching gas that is subsequently produced can pass through the metal body unhindered and uncooled, and the other parts of the switch can be damaged as a result. Furthermore, the metal vapor that forms during vaporization of the metal body could be deposited on insulation material parts, resulting in a reduction in dielectric strength.
OBJECTS AND SUMMARY OF THE INVENTION
An object of the invention therefore is to provide a cooling device of a high-voltage power switch of the type described above that enables efficient cooling of the quenching gas in a reliable manner, with a longer lifespan of the cooling device.
This object is accomplished, according to the invention, by fitting an insulating component impermeable to the quenching gas in the gas outlet in front of the metal body, viewed from the contacts The insulating component is far enough away from the metal body for the quenching gas to be able to pass through holes substantially over the entire surface of the metal body.
The metal body is protected from the direct effect of the hot quenching gas by the insulating component arranged in front of the metal body. While the insulating component is also attacked by the hot quenching gas, under the influence of the hot quenching gas, it releases a gas that is also suited for quenching, and can easily be replaced. Furthermore, when the insulating component vaporizes, no electrically conductive vapor is released, which could contaminate other insulating components in the region of the circuit-breaker unit and thus result in a reduction in dielectric strength. By spacing the insulating component away from the metal body, the result achieved is that on the one hand, the hot quenching gas does not hit the metal body directly, and that on the other hand, the quenching gas can flow away through the entire cross-section of the through-holes in the metal body, passing around the insulating component, after it has hit the insulating component. The invention is advantageously structured in that the insulating component consists of PTFE.
This material has particular thermal stability and, under the influence of the hot quenching gas, gives off gases that themselves can make an effective contribution to quenching the switch arc, i.e. to reinforcing the isolating distance.
Another advantageous further development of the invention provides that the metal body is structured as a hollow cylinder and that the insulating component is structured as a ring-shaped element inside the metal body.
This design is particularly simple. The hot quenching gas which gets inside the hollow cylinder can flow out towards the outside through the metal body, after having interacted with the insulating component. All that is necessary for this is for two elements, namely the metal body and the insulating component, to be attached into each other.
The insulating component can have recesses in regions not impacted by ho
REFERENCES:
patent: 3544747 (1970-12-01), Boersma
patent: 3814883 (1974-06-01), Milianowicz
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patent: 4328403 (1982-05-01), Frink et al.
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patent: 4749831 (1988-06-01), Hosomi et al.
patent: 4935590 (1990-06-01), Malkin et al.
patent: 5159164 (1992-10-01), Koyanagi et al.
Johnson, et al., Development of the Type 145 PM Self-Blast Circuit Breaker, 1991, pp. 1-10.
Lehmann Volker
Lobner Friedrich
Marin Heiner
Hecker Stuart N.
Siemens Aktiengesellschaft
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