I know that maybe is not the correct forum for this one but... does some body can tell about a site were I can get transformers testing, transformers types information in general.

Thanks a lot, I need to study this subject.

 

You have not specified what type of transformer you need. I am assuming that you want general transformer information.
You can try

http://www.stancor.com

Hope this helps you.
ttidoc

 

Go to http://www.epanorama.net/links/componentinfo.html#transformers

 

Responding to Antonio Herrera's Thu, Dec 12, 11:42am, query:

Where are you located?

Regards,
Phil Corso, PE
(Boca Raton, FL)
[[email protected]]

 

Mr. Corso :
I live in Juarez City, Chihuhaua Mexico.

 

That data is very interesting but I was refering to the substation transformers (high voltage).

 

Responding to Antonio Herrera's Wed, Dec 18, 12:34pm reply:

If you want general information.
Contact the service/test/repair divisions of any Large ELectrical
Apparatus manufacturer. Typical are:
General Electric.
Westinghouse.
Asea Brown-Boveri (ABB).
Allis-Chalmers (now ABB?).
Acme Transformer Co.
In the past they (and others) gladly provided Maintenance Manuals or books to customers.

Web Sites.
Key words are "large Electrical Apparatus; Large Power Apparatus, etc.

Specific Standards.
ANSI-IEEE Standards, C37 Series.
NEMA Standards for Transformers, Pub No. TR1-1956 & TR2-1956. Westinghouse Text, "Electrical Transmission and Distribution Reference Book"

Specific problem or suspicion.
Do you want to discuss a specific condition? Here is an example:

Two MV and one LV power generator supplied power to the distribution bus of a large VFD-driven flood-control pump station. The MV generators were connected via a lone step-down transformer. The transformer (secondary) neutral and the LV generator neutral were solidly-grounded. From startup, the system tripped on ground-fault! Experts representing the LV generator manufacturer, the VFD equipment supplier, and the plant owner were called in. After spending weeks pointing fingers at one another they "agreed" that harmonics were the cause. They further concluded that parallel operation of the two sources was impossible. My investigation showed that the transformer was at fault. (Definition of an expert: "ex" - an unknown quantity; "spert" - a drip under pressure).

If you want additional information, do not hesitate to contact me.

Regards,
Phil Corso, PE
(Boca Raton, FL)
[[email protected]]

 

Actually I have one. Recently a partner and I tried to take a oil sample to test it but we noticed that the transformer was vacuuming air (according to our experience, now I konw we need more ) the transformer should be pressurized in order to take the sample. I hope you can help me with this question.

 

Presuming your search of the information provided was unproductive, then please provide additional information! Assuming this a large, or very large transformer, where are you trying to take oil-sample? Is location of sample valve at bottom of:

a) Main tank or oil drain.

b) Main tank vent.

c) Conservator (expansion) tank.

d) External cooling tube assembly.

e) Gas-space above coils.

f) Fault-gas monitor such as Buchholz relay.

Regards, Phil Corso, PE (Boca Raton, FL) [[email protected]] {[email protected]}

 

Further to my earlier message responding to Antonio Herrera's question on oil sampling:

Antonio, your question clearly shows, at least to me, that you are not familiar enough with the sampling procedures to continue.

Therefore, for your own safety, as well as that of others, I strongly recommend you procure the services of a professional testing firm.

Regards, Phil Corso, PE (Boca Raton, FL) [[email protected]] {[email protected]}