Electrical Engineering

Hello Guest.

Surely you are joking.

If you are not joking, then contact the Manufacturer of the Transformer.

When the Transformer was supplied originally, there should have been a large packet containing all the tests done at the maker's works, plus all necessary documentation needed for installation plus connection/installation information, and all future maintenance information.

The Makers normally supply two sets of the complete documents, in waterproof sealed packets, which may be inside a terminal connection box.

If this Transformer has been purchased from others, as a used unit, contact the sellers.

As always, you could obtain a copy of the original documentation from the Maker's Factory - sometimes they ask for a small fee for supplying a second set of the documentation, if you are not the original purchaser.

Kind Regards....

Its 500Kv, not 5kv transformer.

you cannt install it by yourself, its a project team work.

this involve many fields.

what on earth do you hope to know?

are you investor? or project manager? or user?

please mention rating clearly.I am confused as to whether u are talking about a 500KVA transformer or a transformer having 500kv as one of the voltages.Transformers are always rated in KVA and please let us know that so that correct size can be ascertained for installation works.it makes a lot difference .Now as to your question are u going to buy the transformer or it is already with u .If its with u forget the factory tests.If u r going to buy the refer to any standard to have an idea of type and routine test.Normally manufacturers carry out type test only if it is discussed and agreed as a part of the contract otherwise they produce the test certificate copy of test conducted on identical rating and specifications.

Maybe it's just me, but I find these types of questions very very scary. If one needs to ask questions like this, they are far too inexperienced to be able to do it safely. On the other hand, I'm happy that they are at least aware of their shortcomings and are asking these questions. I shudder to to think of all the blissfully ignorant ones merrily connecting wirings in hopes that something will work.

Quite.

Hey, check it may require 20m x 20m space or may be 100m x 100m (is it?) or less. As a quick reply, of such Q from a person asking in this forum than asking the manufacturer.

Hello biswanath.das

There is a huge difference between your two sets of guessed areas required.

It is always best to deal direct with the Makers.

They do know their own product best, really they do.

Kind Regards....

Sparkstation,

I guess 1.5m x 1m will be fairly accurate

Spark

Can you enlight on my Q on Ammeter used in yellow phase?

Regards

Hello again, biswanath.das

I did not see your question of Ammeter used in yellow phase except in your immediately above post.

I do not know the Make, Model, kVA, Voltage in, Voltage out, Delta/Delta - Delta/Star - Star/Star, nor indeed any specifics of the particular transformer.

Is the transformer intended for Pole mount/ground mount/indoor/outdoor?

Does the transformer have natural cooling/forced air cooling/water cooling?

Specifics if given, would assist with realistic answers.

Kind Regards....

Spark, My Q on ammeter is given below.

While measuring current in one phase for small 3 phase motors (say 0.37kw) the ammeter is connected in yellow phase. My Q is why in yellow phase not in blue or red I got an answer, I wish to get the understanding of my friends.

No extra information is required.

Hello again, biswanath.das

Apologies, I thought your question was to do with the Topic: The "500kv transformer".

Your small 3 phase motor would normally be connected in Delta.

In this connection, unless there is a fault in the electric supply, the wiring or the motor, the currents in each phase are identical, within the reading accuracy of the Ammeter.

In most factory or process situations, it is normal to measure current in a single phase.

The yellow phase has been selected as the standard, for measuring the single phase current.

Any one of the 3 phases could be used, but if there is a datalogging system connected to the Ammeters, it is best to always ensure the same phase is being measured, so the total current is then added correctly.

The yellow phase was chosen, almost 100 years ago, as a matter of being uniform, easy to remember, and convenient.

Hope that answers your question.

Kind Regards....

Spark,

I am of the opinion is yellow phase gets affected if there is disturbance in other two phase. The yellow phase also the central winding of upstream trafo core.once there is some problem in red or blue, it will surely affect the flux density in central limb even if its small better, than other limb. We can think more over it and if possible adopt mathemetical justification.

Thank you for your view.

Regards

Hello biswanath.das

In a 3-phase delta connected motor circuit, all phase currents are equal.

Transformer cores/windings/limbs are carefully designed so that equal magnetic flux is passed through each core, when phase currents are identical.

Although one phase winding may be on a "central limb/core" of a 3-phase transformer, the result is still the same as above.

Kind Regards....

That's correct, But if there is disturbance in say red phase like lower voltage, the effect will obviously be seen in yellow, since it comes next to red. I hope you understand my point.