What is Phase to Phase clearance for 800V System Operating Voltage as per IEC61439

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need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.

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what is the suitable voltage of transmission line to transmit 10000w power through 250 km. (a)11kv (b)33kv (c)66kv (d)132kv ]and please tell me whats the logic behind it

7 Answers   ONGC,

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actually i can't understand what is 3dB ? and it's really not clear to me.please any one let it me be cleared.

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Why relay connected R phase and B phase.?

1 Answers  

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Why dnt we generate 5-ph or 7-ph supply like as 3-ph supply

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what types battery chargers are there?wanted with details.

3 Answers   SCS,

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according to ohms law ,the voltage increases then current is what happened?

4 Answers   NTPC,

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in pf lagging means current decrease by increasing voltage is correct or not ? reason ?

3 Answers  

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What is on line ups and off line ups?

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what will be the effect on the voltage .if power frequency is increasing or decreasing.

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Who are the manufacturer for Nitrogen based Fire Protectio/explosion prevention for Oil Filled Transformers? India and international both?

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