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Recently, the Yanzhou Mining (Group) Company mechanical system repair plant in the analysis and comparison of the advantages and disadvantages of various body Gebao transformers basis developed a new type of dry-type transformers 1250kVA mine used Gebao case -- Oval whole corrugated Gebao case. Investigation shows new domestic also no such types of Gebao frames, the mechanical strength and heat release performance than similar products had increased, a contemporary adaptation of external development Gebao transformers. With the constant improvement and upgrading of coal power supply systems, dry-type transformers Gebao type Underground important as electricity equipment has been widely applied. Gebao tank mine is a type of dry-type transformers Gebao main blast patterns, not only to a certain mechanical strength, but also a good cooling effect, the design, manufacture Gebao transformers directly affect the level of technical performance and useful life. This new development is the case throughout corrugated Gebao Gebao case, the low voltage-campus and campus three components, which Gebao replace the 36 oval box wall "U" - shaped corrugated by welding. Gebao case with the following two main advantages : First, good mechanical properties. Gebao frames used Oval-corrugated structure, no stress concentration areas affected by the power more evenly. Moreover, the intensity of the relatively weak case in Gebao Add strengthening of local muscle and strengthen Kok, on both sides of the flange, a solid overall box wall, so that the mechanical strength Gebao case strengthened. Second heat release performance good. Heat release area is a measure of heat release tank capacity transformers important signs. The area of 22.5m2 Gebao case of heat release than domestic products with large capacity 25%. Heat to the top of the most concentrated hemicycle corrugated board, the heat release area than the current widespread use of silk panels increase 2~3 times. In addition, the oval-corrugated structure to speed up the case of heat around distribution. Corrugated panels shaped welding is the case with manufactured difficult, and they take special techniques to prevent the emergence of local shell shaped, muscle, distorted, damaged, the group specifically designed to suits, and in strict accordance with the welding process parameters control group size, effectively ensured that the case of the production quality. (Lijianfeng)
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