the single phase voltage is 230 volts and threee phase is 430 v.why three phase is not 660 v?

2 Answers  

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Why only plate(copper) Earth pit given for neutral earthing? why not pipe(G.I) Earth pit?

1 Answers  

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Why not using Air circuit breaker at High tension side?

1 Answers   Wipro,

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at which voltage level arcing ground is occurs ??????????

0 Answers   TATA,

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why is the core of the underground cable is spiral in shape instead of straight?

8 Answers   Mecon,

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why we used star delta starter for above 5hp motors

2 Answers  

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A Generator is in running condition and Rotor earth fault alarm is coming.How to check on line(i.e in running condition) whether there is actual earth fault in rotor or not.

4 Answers  

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How can we calculate the motor frame sizes?

0 Answers   Essar,

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At the starting of dc motor and syn.motor and induction motor high current flowing through the winding. Due to this the windings burnt out. To avoid this different types of starters are used. But incase of transformer what Will be used (At starting no emf is induced in the primary winding)?

0 Answers  

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what is the function of step up transformer?

2 Answers   DEWA,

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why in isolation transformer we dont get any shok?

2 Answers  

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How can we calculate the KVA rating of a Distribution transformer from its core details?

0 Answers   ABB,

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