Common problems in cast resin transformers

Edwards Finance > Electrical Engineering

Q. 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.

A. -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. -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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