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

I have connected 04nos. earthings to a transformer through 04nos. earthing pits seperately. 02nos. earthings are connected to T/F body, and 02nos. earthings are connected to T/F neutral.T/F capacity is 2000KVA, 11KV/415V. But after completing of 02 years successful operation ,we are facing following problems- 1. CT/PT occured blast one time 2. HT cable box occured blast two times 3. One body earthing strip and one neutral earthing strip of transformer are overlapping at some places. Whenever these two strips are pressed at overlapped points, they made spark. What is the reason of spark? Please explain the reason & rectification of above problems

5 Answers  

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