Answer / ram kumar singh

It is used in HT installations.Arc quenching medium is
vaccum.VCB has one fixed contact and another moving
contact.Vaccum aprox.above one mili bar required.IR value
of Vacuum CB will be very good when open condition.Surge
suppressor is required in series .Contact make & break in
Vaccum.Dieclectric strength becomes very good in VCB.It has
more details.

Answer / santhosh samy

Vaccum Means Notthing In A Working Period The Circuit Will
Be Any Sparking Due To (Short circuit)Period It Will Not
Accept Burning Process Becaus No Air Means How To Get A
Fire ok Its My Openion

What is Horan Gap Fuse? Where it is used?

1 Answers  

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(1)For 3 No 1500 KVA transformer require on one single bus bar or need to be section through bus coupler means upto 3MVA.(2) 22KV Net work system as ring, How maney I/C required or 0ne I/C and one O/G.(3) What should be rating of VCB for 22 KV line.(4)Electrical/mechanical inter lock, why we need.

0 Answers  

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Please elaborate th´evenin’s theorem?

0 Answers  

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How to measure the Harmonic Distortion of UPS ie THD?

0 Answers   MG Tech, NIC,

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how to build a network which step down 415v to 1v rms

0 Answers  

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Difference between on line capacitor and Station type capacitor.

1 Answers  

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How does frequency affect KVA rating of a transformer? If a 500 kva, 500 to 250 v, 60 hz t/f used in Canada is to be operated on 50 hz in Europe frequency then how will its KVA rating change? a-increase b-decrease c-remains same

1 Answers  

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Give the selection criteria of a 3 Phase transformer for industrial purposes ?

5 Answers   NDDB, TATA,

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What is the main uses of VCB & ACB?

2 Answers  

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what is tan delta measurement?..... why that terminal is earthed.....?

4 Answers   Power Grid,

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We have two Al.busbars each of size 125mm*10 mm connected in parallel.To increase the current rating ,can we connect third busbar of size 100mm*10mm in parallel to existing two busbars?In my opinion ,if we connect busbars of different sizes in parallel,then the busbar of lowest size will take much current.So this type of paralleling should be avoided .Am I correct?

1 Answers   PDP Steel,

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what is meant by residual over voltage & residual earth fault ?

0 Answers  

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