DEAR ALL I have motors ( 10 units )each one is 90kw 380V 50 HZ 1000rpm but new local pwer is 220v 60 hz requierd rpm should be 1000 pleas what the beast solution is used frequncy converter or rewinding all motos or chang all motors thanks

6 Answers   GE,

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UPS battery Back time = no.of Batteries * Ah of the Battery / output KVA * 130 ? what is the 130 means ? can any one help? because all are using this formula how its came 130?

2 Answers  

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Define liftable weight of a transformer? Does the total weight of transformer include oil weight?

0 Answers  

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motor work in hat principle generator work in what principle transformer work in what principle pls explain with details or answered to ramadoss.sepc@gmail.com

1 Answers   Vestas,

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what is the difference between ac and dc hipo test of cable?

2 Answers  

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why do we carry out winding resistance test?

0 Answers   MahaGenco, MAHINDRA,

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Why the Transformer connection is changing in different transformer?(Like Star & Delta,Delta & Delta,Star & Star,Delta Star) From that connection where it is used?

2 Answers  

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if two heater of rating 1KW,200v are connected in series 100v supply what will be the power taken

1 Answers  

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Brief difference btween aluminium & copper conductor

2 Answers  

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What is the working principle of MIG welding? and its out put Voltage?

0 Answers   L&T,

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Why distribution transformer secondary voltage is 0.433kV instead of 0.415kV.all other switchgear rating are 415 volt??

3 Answers  

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our company have 750 kva oil transformer.still we have facing a problem that is when voltage is 11.5 kv coming from HT side then LT-side voltage is 420v or above at tape 1.please give me best solution to decrease the voltage

4 Answers   Gannon Dunkerley,

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