Answer / ankitshah55

Because rain drops are not continuous. Only in rare cases if rain is full than not only LL but LLL fault can also occur. But in transmission lines the design and slag plays the important role. Also insulators are designed so that water cannot accumulate.

What is a formula to decide the size of the cable of the star delta motor ( From Contactor to the motor 2 runs )

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If a Power Transformer Fails and the transformer manufacturer suggest that "Do all electrical test on the transformer?". What are the test to be conducted in this condition?

5 Answers  

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I have been using an 600VA with 0.6 p.f UPS with my desktop which has 450W power supply unit. Can anyone explain how can this happen . Because the output of the UPS is 360W (600*0.6) (<450W)

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How would you relate your key competencies to this position?

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for hipot test on 33kV busbar, we will test on 70 kV or 56kV, what is the acceptable leackage current?

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I am having a DG set.The 415 V from Generator is step up to 460 v and then the same is used for Induction furnace. before Step up, I am connecting LT load to my factory use. When Induction furnace is in service from DG, when i try to start a motor, the generator is tripped.Please tell me the reason.

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what is the reqirred voltage in HT motor to get full RPM on no load test?

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in a delta-star with neutral grounding on star side what will happen if one star limb  got opened at star point

1 Answers   NTPC,

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What is the ampereage of .75 ton Ac

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Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply..............

9 Answers   NTPC,

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I HAVE BEEN SELECTED FOR APGENCO A.E(ELECTRICAL) 2008.HOW MUCH WEIGHTAGE FOR INTERVIEW AND WRITTEN TEST.HOW I HAVE TO PREPARE. PLEASE GIVE INFORMATION IF U KNOW.WHAT ABT G.D THIS TIME.CALL RATIO 1:2

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WE HAVE A PROBLEM THAT THE MAIN DRIVE OF OUR CEMENT MILL HAS AN EARTHING PROBLEM?TWO OF STATOR WINDINGS INSULATION HAS BEEN COLLAPSED DUE TO AGING PROBLEM.THE PHASES HAVE BEEN BYPASSED AND NOW THE LOAD HAS BEEN INCREASED.WE CAN'T REPLACE THE MOTOR.KINDLY HELP ME BY GIVING SUGGESTION THAT HOW TO MAINTAIN THE STARTING TORQUE AND CURRENT FOR HIGH LOADS.

1 Answers   ACC,

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