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Enclosure surface with adhesive medium as particle trap in gas insulated electric components

IP.com Disclosure Number: IPCOM000243474D
Publication Date: 2015-Sep-24
Document File: 3 page(s) / 37K

Publishing Venue

The IP.com Prior Art Database

Abstract

To increase the reliability of the switching devices, it is therefore beneficial to reduce the above disadvantages. According to the present disclosure, a gas-insulated electric device, with the inner wall of its enclosure being at least partially coated with an adhesive medium that is acting as a particle trap, is provided. In the present disclosure, the adhesive medium is preferably able to bind and not to release particles that hit the medium for the first time. In a particular embodiment, the gas-insulated electric device is a gas-insulated switching device. In a particular aspect, the adhesive medium is polyurethane-based, e.g. Reinzoplast®. In a particular embodiment, the adhesive medium is provided as a layer.

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Enclosure surface with adhesive medium as particle trap in gas insulated electric components

TECHNICAL FIELD

The present disclosure in general relates to gas-insulated electric components, and specifically to gas- insulated switching devices.

BACKGROUND OF THE DISCLOSURE

In operation of gas-insulated electric components, small non-insulating particules in the insulating gas may decrease the dielectric properties. For example, in a gas-insulated switching device, non-insulating particles may be created due to friction during switching operations and have these adverse effects. These particles decrease the electric field strength of the device, and therefore generally increase the risk of an undesired electrical breakdown.

Therefore, gas-insulated switching devices may contain a particle trap at which lower electric field strengths are present. Particles that are created during the switching operations will be harmless once they arrive in this area of the particle trap. However, not all particles may be trapped. Also, even the trapped particle take some time while moving towards the particle trap, and in the meantime they may come into a region with a high electric or electrostatic field stress (e.g. originating from active parts of the switching device) and thus cause electrical breakdown.

SUMMARY

To increase the reliability of the switching devices, it is therefore beneficial to reduce the above disadvantages. According to the present disclosure, a gas-insulated electric device, with the inner wall of its enclosure being at least partially coated with an adhesive medium that is acting as a particle trap, is provided. In the present disclosure, the adhesive medium is preferably able to bind and not to release particles that hit the medium for the first time. In a particular embodiment, the gas-insulated electric device is a gas-insulated switching device. In a particular aspect, the adhesive medium is polyurethane-based, e.g. Reinzoplast®. In a particular embodiment, the adhesive medium is provided as a layer.

DETAILED DESCRIPTION OF EMBODIMENTS

A particular embodiment of the present disclosure is described by the German patent application DE000001812686A.

A particular embodiment of an SF6-insulated disconnecting switch is described in more detail by US Patent 3,856,978. Figure 7 thereof shows a sticky surface (130) on the inside of the outer grounded casing (59), which is a region of low electric field strengths. The particles are transported to the sticky surface either due to charge, gravity or gas movement within the casing ("a blasting of high-pressure SF6

gas", col. 7, lines 20 and 21).

A particularly preferable embodiment differs from the above embodiments in that the adhesive medium is polyurethane-based, e.g. Reinzoplast®. In contrast, embodiments of prior art use e.g. dicyandiamide or polyvinyl copolymers {see US Patent 3,856,978). The polyurethane-based adhesive medium of the


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