In aircraft,why we use 400 htz equipment.and use common earthing

1 Answers  

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How to calculate the current carrying capacity of sized cables, and there is any formula. please send to 'than.achu@yahoo.com'

1 Answers   Blue Star,

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

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sir i ve applied for hindustan petroleum and power grid india ltd..and the exams on feb 22.can you pls send model papers and tell how to prepare for those.i need to get into any of these for sure.....

0 Answers  

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what is relation between HP & BHP

3 Answers   Usha Martin,

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how we can calculate earth fault current?

1 Answers   Alchemist,

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why we dont store the ac power in battery?

1 Answers   TCS,

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What is the meter used to check the DG sound level.and pollution check

2 Answers  

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what is meant by motor protection relay & its working principle ?k

1 Answers   Pricol,

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why the manufacturer provide M and C terminals ? why they will not internally short them ?

1 Answers  

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How much DC or AC Current that a Human Body withstand for Electrical Shocks?

4 Answers   Suzlon,

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What are the various kind of cables used for transmission?

0 Answers  

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