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shaik.thameem
Associate

Join Date: Dec 2008
Posts: 33

Transformer Testing

06/17/2010 5:24 AM

sir , how can i test the winding resistance with out giving DC supply to HT transformer ? and how can i test the HT transformer load losses instead of going to short circuit test? please tell me detail matters and analysis. thanking you
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Anonymous Poster
#1

Re: Transformer Testing

06/17/2010 7:45 AM

You can test with any NETA certified testing organization.
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PeterT
Guru

Join Date: May 2010
Location: Liverpool, NY
Posts: 961
Good Answers: 131
#2

Re: Transformer Testing

06/17/2010 12:19 PM

Winding resistance of a transformer cannot be measured without applying a voltage/current (usually DC) to the transformer. We typically use a DC power supply capable of putting out 3 amps at up to 24V, measure the voltage drop across the winding with a digital multimeter, and do the Ohm's Law math. Primary windings are often in the range of several tenths up to an ohm or 2. Secondary windings will usually be in milliohms, seldom as high as half an ohm, based on a lot of transformers I have seen over the years.

Load and no-load losses are based on design and manufacturing parameters and materials, and should be provided by the manufacturer. They are typically not measured in the field. The Mfr of the transformer should be able to provide that data for you, and they should be on the original test reports for the unit.

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Anonymous Poster
#3

Re: Transformer Testing

06/18/2010 3:45 PM

It is just off topic but I like to use this forum as I am observing a lot of People from middle east are using this forum and making life miserable for others if they have guts please respect knowledge .

"Once there was a lion who was in his country zoo having a good meal life .once there was a oil middle east sheikh visited the zoo .The organizers proudly show the lion to oil middle east sheikh . The oil middle east sheikh liked the lion very much and the other lions said to lion you are lucky they are taking you to best place it will be like heaven .The lion felt proud and finally the oil middle east sheikh gave a large amount of money and transfer it to Middle east ZOO .1st day they give him bananas 2nd day he got bananas third day things difficult for him he was dying with hunger he shouted at the zoo guys "WHY ARE YOU GIVING ME BANANAS DONT YOU KNOW WHAT A LION EAT " the attendant replied --please note it – "YOU ARE ON A MONKEY VISA SO SOLONG AS YOUR VISA IS YOU ARE A MONKEY " "---Moral of story please check your visa before travel to middle east may be they give you a monkey visa .

Please please please they are making life a hell for expatraites and if you are thinking to support them

think twice

Ferth
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34point5
Guru

Join Date: May 2010
Location: in optimism
Posts: 4050
Good Answers: 130
#4
In reply to #3

Re: Transformer Testing

12/16/2010 3:37 AM

I don't understand your problem Ferth - but if as I suspect, you are saying your countrymen are an embarrassment - you might be the bigger embarrassment - or monkey, as you seem to be implying.

But I could be misreading the "wall to wall arrogance" your post seems to convey.

However; if you'd like to know how to competently post an image, perhaps read one of the threads on "how to".

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prakashmanilalgandhi
Participant

Join Date: Nov 2016
Posts: 1
#5

Re: Transformer Testing

11/01/2016 9:55 PM

sir

when we perform transformer winding resistance test by omicron kit why the injecting current should be 10A or below is there any reason behind this and how can i determine the WR result is there any clculation if any pls give me example
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34point5 (1); Anonymous Poster (2); PeterT (1); prakashmanilalgandhi (1)

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