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D.S.S.SUNEEL

08521A0217

3rd EEE

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A vacuum is a one in which the pressure ismaintained below atmospheric pressure.

Its measured in mm of Hg.

One mm of Hg pressure is known as onetorr.

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Vacuum is used as arc quenching mediumin VCBs.

It offers high insulating strength.

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Whenever the cb contacts are opened anarc is produced between the contacts by the

ionization of metal vapours of contacts.The arc is quickly extinguished becausethe metallic vapours, electrons, ionsproduced during arc rapidly condense on thesurfaces of the cb.

This is due to fast rate of recovery of DESof vacuum.

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Compact, reliable and longer life.No fire hazards.

No generation of gas during or after

operation.They can interrupt any fault current.

Withstand lightning surges.

Low inertia and require smaller power forcontrol mechanism.

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Suitable for outdoor applications rangingfrom 22KV to 66KV.

Suitable for a majority of applications inrural areas.

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For a country like India, where long range oftransmissions were installed will bedefinitely benefited by using these VCBs.

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Any queries????

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Thank U.