Transformer Trouble

Yes, many can.

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You're using a multimeter to check the HV windings?

I've heard it all now!

Engage an engineer that knows what he is doing.

They always blame the messenger.

You need a qualified power distribution electrician/engineer to look at this transformer! People neither qualified or authorized by the power distribution agency should be touching the equipment that distributes electric power. Get out and leave this to professionals that know what they are doing and that recognize what they see in front of them.

A transformer feeding a plant with an 11kV primary is part of the power distribution. There should not be a diode in the wiring of this type of a transformer. The only thing that one might have in a power distribution transformer is fuses and possibly a neutral grounding resistor. I take that back slightly, what an unqualified person might call a transformer might actually be a transformer with remote switching circuitry in it. Still an unqualified person should not be in there. GET OUT!

My passion for getting amateurs out of places that they do not belong prevented me from doing a proper diagnosis of your problem.

If you are lucky this transformer (if it is a transformer) has an internal fuse that has blown open when it became overloaded that the OP is not aware of. Since the OP does not use qualified people to work on and design their power distribution, I suspect the transformer has a roasted open secondary. A properly designed power distribution would have protected the wiring of this transformer when an overload happens. By saving a few rupees in having an amateur design and maintain this power distribution the (hopefully) profit making plant is now out of commission until a replacement transformer can be acquired. Fuses and circuit breakers save infrastructure, mitigate downtime and ultimately money. A qualified electrical engineer, electrician, technician will know how to size the equipment protection devices to minimize the cost of installing these devices.

Hey guys, this comes from an area of the world where an 8 story factory was built "illegally" and yet somehow employing thousands.

No one saw a thing.

No one inspected a thing.

No one cares.

Wal-Mart bought all of the stuff no questions asked which therefore makes it perfectly ok. Right?

Yes and there are parts of this world where all sorts of criminal and human rights violations happen on a daily basis. I cannot do anything about where or who Wal-Mart, K-Mart, or even where S-Mart does their business. When I can I avoid Wal-Mart for precisely the reasons you highlight.

I can hold back what information I give to somebody I believe is not qualified to safely perform the needed work. I probably should have offered a teasing answer by providing a link to a full IEEE document on testing power transformer impedance. Maybe that would have been better proof of a lack of comprehension.

Red,I guess because my training and education come from the "First, do no harm." school of thought, I find this sort of thing almost incomprehensible.

Or as Vizzini would say, "Inconceivable!"

VCB Tripping

This yahoo is going to get somebody killed. There are plenty of videos showing how dangerous it is doing power distribution work. Then again when a billion plus people are around you I guess safety is less of a concern for some.

How true. Ignorance is bliss.

ziaiqbal and the OP will make a great pair. As I just posted: "Can I use 230 volt 50 hz electric cooking range on 230 volt 60 hz supply."

But wouldn't your food cook 1.2 times as fast? :-D

Only if the element was manufactured in the northern hemisphere and is moved across the equator to the southern hemisphere. Or, vise versa.

its not first time i am using muiltmeter,it was a just a basic checkup,now we are going to check megger readings,i know there is no diode like thing in transformer,but the meter shows ....but i am looking for a good and fast method for finding the fault.

"a good and fast method for finding the fault" is to pay a qualified, competent electrical technician to trouble shoot and solve the problem.

You are not that person.

Hire an engineer that knows what he is doing. Please!

harshitpatel Please heed the advise you have been given.

Employ an engineer that understands both MV systems and transformers.

You're putting yourself and your colleagues in danger. MV isn't very forgiving if you make a mistake.

I was gonna supply a completer answer - or ask questions - but i deleted that so as not to enable OP dangerously beyond his experience. OP please seek more expert advice if you dont have HV experience, the life you save may be your own.