Resin insulated dry-type oblong pancake coil and its winding method

Abstract

The invention discloses a resin-insulation dry-type long-round-cake-shaped coil. The resin-insulation dry-type long-round-cake-shaped coil comprises end insulators, wires, an inner surface insulator, an outer surface insulator and line outlet terminals. According to the resin-insulation dry-type long-round-cake-shaped coil and a winding method, the use amount of an iron core of a transformer is reduced, the manufacturing cost is reduced by about 12%, and the no-load losses, the no-load current, the noise and the like of the transformer are optimized; due to a continuously-arranged coil structure, the wire filling coefficient is increased, the heat dissipation performance is good, the overloading capacity is higher, the electric field intensity in the coil is balanced, partial discharging is reduced, convenience is brought to pouring of epoxy resin, air holes, shrinkage porosity, cracks and the like are not prone to occurrence, the safety performance of the transformer is improved, and losses are reduced; as non-full-turn design is adopted for the portions, close to the ends, of the coil, the electric field intensity is optimized.

Description

technical field [0001] The invention relates to the technical field of electric equipment, in particular to a resin-insulated dry oblong coil and a winding method. Background technique [0002] In today's low-carbon economy and energy conservation and emission reduction, energy-saving products have become the key. As a transformer for power transmission in the power system, it consumes part of the power itself during operation, and must also withstand the test of lightning shock, overload shock and insulation aging; the safe and energy-saving economical operation mode, if simply passed with additional materials In exchange for the way of consumption, the user must increase a large amount of one-time capital investment. Therefore, it is an inevitable trend to design a safe, efficient, and low-cost transformer. [0003] The existing high-voltage coils of resin-insulated dry-type transformers are basically segmented layer structures. Due to the large distance between segments,...

AI Technical Summary

Problems solved by technology

[0003] The existing high-voltage coils of resin-insulated dry-type transformers are basically segmented layer structures. Due to the large distance between segments, the filling factor of the wires in the entire coil is small, that is, low utilization rate and high cost.

At the same time, due to the particularity of the structure, the local electric field intensity is high, and the partial discharge is not easy to control

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