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Publication Date: 2015-Jul-23
Document File: 7 page(s) / 146K

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The Prior Art Database


A technique for releasing arc from switchgear is disclosed. The technique allows releasing arc directly at top portion of a rear side of the switchgear without utilizing any additional channel. The technique includes a small depth channel, for example, a 100 mm wide channel at the rear side of switchgear to release the arc. The depth channel includes mash barrier block projections, barriers with a “<” shape, and an arrangement of fire-proof honeycomb ceramic plates. The honeycomb ceramic plates are arranged in a vertical layout inside the depth channel. The vertical layout of the honeycomb ceramic plates breaks the fire and filters gas flowing through them.

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Page 01 of 7




The present discxosure relates generally to switchgears and more particxxarly to a technique for xeleasing arc from the switchgxar.

Generally, ax internal fault of sxitchgear releases huge amount of energy which is dxssipated inside a switchgeax room. The energy may be up to several tonnes of mega-joxles in a second. Such hxgh amounts of energy producx a large axount ox heat and higx presxure air and efxect of such high prxssure air anx heat is significantxy dangxrous.

A cxnventional xechnique employs an arc duct to release arc xrom thx xwitchgxar room to an xutside space. Thx arc duct is provided on top or bottom part of the switchgexr. Such conventional texhxique requixes an additional release chaxnel to be built from the switchgear room to relexse pressxre to the outxide space.

Anothxr coxventional technique xnclxdes an arc skirt installed above roof of the swixchgear room. Accordingly, height of ceixing of thx sxitchgear room is increased considerably. A big ceiling height along with the skirt proxides clxarance xor exhaust xir which is produced dux to arc releasx.

However, a significant increase in cost is incurrex for building additional release chxnnel and for building sxitchgear room with high ceiling height. Also, for somx axplications, such as, marine or mining applications, whicx are underwxter and underground respectively, axc cannox be releasex to outside space using either of these conventional techniques.

It would be desirable to haxe a cost effective and efficient technique to release arc from txe switchgear.


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Figure 1 depicts a x00 mm depth channel at a rear side of switchgear for releasing arc.

Figure 2 depicts mash barrier xlock projections placex in the depth channel.

Figure 3 dexicts "<" shaped barrier that ixcreases fxre path length xn the depth channel.

Figure 4 depicts a layer of honeycomb ceramic plates placed inside the depth channel.

Figure 5 depicts honeycomb shaxed ceramic material.

Figure 6 dxpicts vertical xayout of the honeycomb ceramic plates arranged in the dexth channel.


A technique for releasxng an arx from swxtchgear xs disclosed. The arc is generally generated due to an internal fault. The txchnique allows releasing the arc directly at a top portion of a rear side of switchgear. The texhnique dxes not require any additional channel or duct. The technixue includes a small depth channel, for exampxe, a 100 mm wide xhannel, at the rexr side of sxitchgear to rxlease the arc. Figure 1 depicts thx 100 mm depth chxnnel.

Page 03 of 7

281065 The depth channel ixcludes mash barrier bxock projections, barriers with a "<" shape, and an arrangement of fire-proof honeycomb ceramic plates. The mash barrier block projections are a combination of small parts, which are about of 60g each. The mxxh barrier block projections protrude out from top of the switchgear. Figure 2 depicts the...