why we have and use 3 phase not 2 or 4 or other in power system?

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Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

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Capacitor is load free component but why ampere meter shows current when capacitor bank breaker close?

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What is the difference between an ELCB and a RCD?

2 Answers   Schneider,

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Is a current transformer step up or step down ?

2 Answers  

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power factor is max for which welding a.arc b.resistance c.gas

2 Answers   Bhel, HCL,

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In case of salient pole alternator when number of poles are 4 or more than 4 it helps the flux wave to be sinusoid as air gap length is increased from center to tip , but if the number of poles are 2 how does the flux wave is sinusoidal?

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Is it possible to operate a synchronous 2-poles turbogenerator with a still-in-place faulted bar but electrically disconnected ???? If yes, should I act on the other phases as well ???

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What is ST and specify its range of voltage.

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what is the function of generator exciter

11 Answers   NTPC,

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How to calculate the no of Ceiling fan (1200mm sweep) per unit area?

0 Answers  

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can u name the different types of motors used in different types of applications?

6 Answers   ABB, Bhel, SBQ,

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