what is the working principle of UPS?

2 Answers  

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WHY RATING OF VCB NOT LESS THAN 630A

0 Answers  

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how can we use isolator as breaker

4 Answers  

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what is short circuit force ? How to calculate it for Panel?

1 Answers   Bilt,

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what is the mager value of star motor and delta motor between phase to ground and phase to phase, and minimum how much should be value ?

1 Answers  

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draw a circuit diagram connecting transformer OLTC- RTCC- VCB-Marshalling Box otherwise Explain in words

1 Answers  

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If the rank of a (5x6)matrix Q is 4, then which one of the following statements is correct ?

1 Answers   GATE,

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what meaning of gd squre

1 Answers  

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If any HVDC line is going with positive & negative(the negative usually have return path of current with earthing electrode). Now the question is if this HVDC earthed electrode which is using as return path and earthed any nearby 400kv or 220kv AC substation equipments. which will be the impact of this on AC substation & its equipment, how severe may be this and what should be the minimum distance require between HVDC earthed electrode and AC substation equipments? It's really an high engineering level question...Dare to answer and increase your knowledge.

0 Answers   MEIL,

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in our sub station why we step down firstly 33kv\11kv then 11kv to 430v. can we direct step down 33v to 430.v.

18 Answers   Eaton, Siemens,

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How we can recongnise the phase displacement of transformer connection between primary & scondary...plzzz explain it with example.........

0 Answers   BOC,

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Why the brushes used in dc machines are made of carbon not from other metal?

3 Answers  

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