Common problems in cast resin transformers

Dear All,
i am involved in commissioning of 1000 MW power plant and in future shall be responsible for maintenance also.
So I just want to know the common problems encoutered in GEAFOL cast resin transformers. As we want to commission 2MVA,6.6/.415KV,4MVA 6.6/.415/.415KV three winding transformers.
Also please if some one can provide some case study on these types of transformes.
Regards
Mayur
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On 6/27/07 6:35 AM, in article snipped-for-privacy@z28g2000prd.googlegroups.com, " snipped-for-privacy@gmail.com"

It seems strange to me that someone involved with a 1GW power plant will rely upon casual replies from the internet to guide its design.
Bill
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| On 6/27/07 6:35 AM, in article | snipped-for-privacy@z28g2000prd.googlegroups.com, " snipped-for-privacy@gmail.com"
| |> Dear All, |> |> i am involved in commissioning of 1000 MW power plant and in future |> shall be responsible for maintenance also. |> |> So I just want to know the common problems encoutered in GEAFOL cast |> resin transformers. |> As we want to commission 2MVA,6.6/.415KV,4MVA 6.6/.415/.415KV three |> winding transformers. |> |> Also please if some one can provide some case study on these types of |> transformes. |> |> |> |> |> Regards |> |> Mayur |> | It seems strange to me that someone involved with a 1GW power plant will | rely upon casual replies from the internet to guide its design.
Strange, indeed.
And you'd think they'd have more engineers in India (the poster's location) that can handle this based on what they learn in school. Would not an EE major in power systems at IIT have learned these things? Or maybe Mayur only went to one of the smaller schools.
He should be consulting his engineering texts, as well as the manufacturers of the equipment that was, is to be, or might be, purchased. The makers of the big electrical equipment for large power plans and transformers of that scale have all sorts of studies and analysis data. If not enough of that can be found on the web, then get it from the sales people that represent the company(s).
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| Phil Howard KA9WGN (ka9wgn.ham.org) / Do not send to the address below |
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On 6/27/07 1:46 PM, in article snipped-for-privacy@news1.newsguy.com,

It is one thing to learn things in school, and another to put learned things into practice.
Although I learned about transformers in school, I almost always bought them rather than made them. That change fairly late in my career when EGG flashtube trigger transformers were very expensive and had long delivery times. They turned out to be easy to make at about 20% of EGG's asking price.
Nevertheless, my designs were less than optimum. There is a lot of experience necessary for a custom transformer manufacturer to produce a reliable custom design that is not overly large and heavy.
Bill
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Hello All

As I read it, it is a "fait accompli", that is he is getting these dry type transformers, and is not sure whether there are special requirements for commissioning etc.

GEAFOL is I think a trade mark of Siemens. If you put it into google you get a number of hits, including some reporting problems.
I do not think that the average electrical engineering graduate would know much about the design of dry type transformers of the size mentioned, It is a very specialised area.
If the manufacturer gets it right, they can be excellent, but they suffer from the basic problems that resin and metal do not expand at the same rate, and that the stress free size of the resin is fixed at the temperature at which its cross links formed as it sets.
John
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John Rye
Hadleigh IPSWICH England
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Thanks John Rye
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well Mr. Bill, Definitely i am not going to rely on internet and specially on comments of people who reply casually. i just wanted to get a better insight and leave no stone unturned.
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