E turn insulation class 220kV transformer
A turn insulation and transformer technology, applied in the field of E-class turn insulation 220kV transformers, can solve the problems of transformer overload operation ability and short-circuit resistance thermal stability, which cannot meet the production and application requirements
Inactive Publication Date: 2016-03-09
SHANDONG POWER EQUIP +1
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Problems solved by technology
[0002] my country's oil-immersed power transformer has a heat resistance grade of A, that is, 105°C. The transformer's overload operation capability and short-circuit resistance thermal stability are poor, which cannot meet the needs of production and application.
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[0009] A class E turn insulation 220kV transformer, including a winding and an iron core. The insulation of the winding wires is made of heat-resistant micro-crepe paper, and the insulation of the winding wires is wrapped in three layers. 4mm, the wrapping paper is imported Minsk heat-resistant paper; the middle layer is wrapped in the same direction, the ordinary butt wrapping method, and the wrapping paper is imported Minsk heat-resistant paper; the outermost layer is overlapping wrapping, lapping 2mm- 4mm, wrapping paper is imported Minsk heat-resistant paper. After the winding is finished, the pressing force is 3.5N / mm 2 The pad compression rate is 8.5%, and the winding is dried with a meteorological drying tank.
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The invention relates to an E turn insulation class 220kV transformer. The transformer comprises a winding and an iron core, wherein a lead wire insulation part of the winding adopts heat-resistant clupak paper; the lead wire insulation part of the winding is wrapped with three layers; the innermost layer adopts an overlapped lapping mode, the lapping size is 2-4mm, and wrapping paper adopts imported Munksjo heat-resistant paper; the middle layer adopts a homodromous lapping and general butting lapping mode, and wrapping paper adopts the imported Munksjo heat-resistant paper; and the outermost layer adopts the overlapped lapping mode, the lapping size is 2-4mm, and wrapping paper adopts the imported Munksjo heat-resistant paper. According to the transformer, through material change and process improvement, the turn insulation class of a 220kV power transformer is improved to the E class for the first time, namely, 120 DEG C, and the overload operation capability and short-circuit thermal stability resistance of the transformer can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of transformers, in particular to a Class E turn-insulated 220kV transformer. Background technique [0002] my country's oil-immersed power transformer has a heat resistance grade of A, that is, 105°C. The transformer's overload operation capacity and short-circuit resistance thermal stability are poor, which cannot meet the needs of production and application. Contents of the invention [0003] In view of the above problems, the present invention obtains a class E turn-insulated 220kV transformer with better overload operation capability and short-circuit resistance thermal stability through material change and process improvement. [0004] In order to solve the above problems, the technical solution adopted by the present invention is: a class E turn insulation 220kV transformer, including a winding and an iron core. The inner layer is an overlapping wrapping method, with an overlap of 2mm-4mm, and the ...
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Inventor 张书韬孟京京张宁单来支高慧高运兴
Owner SHANDONG POWER EQUIP