Answer / jai sharma

tol r setting should be 80% of tripping current b'cos thermal effect in bimetalic conductor strips starts heating from 80% and then after few 4-5 minutes at 100% trip or actuated

Can without battery on line UPS,off line UPS or Invertor works please brief.

5 Answers  

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Dear Sir, we met a disaster with our 62.5 kva genset, after rewinding we informed by our contract engg that due to return current coming in neutral & impropper earthing this happend. But after all set up & load balance we checked & found again we have about 20 to 32 amp return current on neutral. we have 12 airconditioner + 12 mini fridge on single phase line. Pl suggest any idea to solved this problem

3 Answers  

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Pls explan the OLR setting in VCB at HT yard

0 Answers   Juniper Networks,

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At the time of 1st charging of transformer, there were huge inrush current, so why at that diffrential relay are not operated? Why?

3 Answers   Adani,

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what is EIB lighting control system? what is the advantages of this system?

0 Answers  

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when will cause the negative sequence falut in electrical system?

2 Answers   Schneider,

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why it is in star to delta form of Synchrounus generator and delta to star form of Generator Transformer (or step up transformer)

1 Answers  

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What is Hi-Pot Test for Grid Station HV Equipments?

2 Answers   Siemens,

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WHAT IS THE FORMULA FOR CALCULATING CURRENT RATING(DIRECT IN GROUND OR AIR) OF ARMOURED(XLPE) CABLE OF 4C,16Sqmm?

0 Answers  

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how to measure the A.C flux .-instrument

8 Answers   NTPC,

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how can we use isolator as breaker

4 Answers  

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why we have and use 3 phase not 2 or 4 or other in power system?

0 Answers  

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