Answer / prasanna kumar

motor running with star-delta starter or DOL will show full
load of the motor unless the motor drawing high currents due
to faults.while coming to the vfd motor may run at high
speed or low speed acc to the requirement.when it was
running with high speed it will draw more current.

What is the effect of using an underrated size cable to supply electrical power to a 3 phase ac electrical motor? What is the effect of using an overrated size cable for the same motor?

1 Answers  

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In step down transformer (415/200V),mistakenly secondary side is connected to 415V for some hours, what would be result of this condition?

19 Answers   Essar, GAIL, Vizag Steel,

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defination of static variable compensator

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why 400Hz is used for aircraft systems ?

14 Answers   Cabin Crew, Jet Airways,

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now a shunt motor is practically a constant speed motor , then how does it meet the increase or decrease in the load ?

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3 shows a 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.

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How can you calculate the size of the down conductor cable for the lightning protection system. Is 70mm2 cable can replace 95mm 2 bare copper cable when the copper tape size is 25Wx3 thk mm.

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what is doid

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How much CTs are required to measure th curent in DOL starting of motor?PLs explain.

1 Answers  

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List the advantages of star-delta starter with induction motor?

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what type of euse we should use ? 1- High resistance & low temperature 2- High temperature low resistance

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what does the regenerative braking mean?and how it used for Dc motor? thanks.

2 Answers  

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