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what is "pu" in electrical engg.

the pu system simply th concept in electrical engg. once
the base value is defined, we can easily visualise each
parameters.
this makes the calculation very simple.

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2- What are the percentages between excitation currents in phase (R, S and T) in ∆ and Ỵ connections in excitation Current test in transformers?

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how i can calculate the size for fire cable

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what is the difference between c power and U power acb breaker

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thyristor controlled APFC panel design parameter?

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What are the three major categories of error?

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What is the difference between amorphous core transformer and CRGO core transformer?.

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Explain the working of variable frequency transformer?

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Please brief me about number of pole in alternator.In single phase alternator coils are connected in star or series. How to calculate frequency for the same.

993

what r the checklist while installing 500 kva transformer

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Can anyone tell the proper diagram of star delta starter????

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what is the use of vcb & isolator in substation?

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As we use capacitor bank in 3ph ckt to improve PF, can we use capacitor in single ph domestric use, in house we have Fan,Mixer,electric cooker,iron,tube choke they also lag the system,because it is inductive load. if it is possible to improve PF of single ph system-- if yes- type of capacitor to be used,connection diagram, working in detail. if no-- list it.

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wat is the first thing dat is needed, 2 lay a cable in some area??

1047

For high frequency application we use which transformer?

963

If the rated speed of a d.c. Shunt motor is1440 r.p.m, which method of speed control would you suggested to obtain a speed of 1500 r.p.m?

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