Forced-directed oil cooling coil configuration

Abstract

The utility model relates to a coil structure with strong oil guiding and cooling, belonging to the technical field of transformers. Its structure includes a ring coil, a holding structure frame, an inner oil baffle, an outer oil baffle, a first insulating block, an insulation structure at the end of the ring coil and an oil blocking structure at the lead wire, and a holding structure frame is arranged inside the ring coil. There are inner and outer oil baffles on the inner and outer sides of the ring coil, cardboard is arranged between the holding structure frame and the inner oil baffle, an oil resistance structure is provided at the lead-out line at the lower end of the ring coil, and the upper and lower ends of the ring coil are respectively provided with There is a first insulating block, and a coil end insulating structure is arranged at the lower part of the first insulating block at the lower end of the annular coil. The oil volume of the three oil inlets at the end of the toroidal coil of the transformer can be respectively 27.7%, 33.3% and 39%; the oil volume is not much different, and the coil can be effectively cooled. While achieving better cooling effect, the performance of safe and reliable operation of the product is also improved.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a coil structure for strong oil-guided cooling. It can be applied to high-voltage, ultra-high-voltage large-capacity AC and DC transformers and reactor products. Background technique [0002] In the existing coil structure, due to poor heat dissipation conditions, the inner and outer longitudinal oil gaps of the inner coil are small, and the outer longitudinal oil gap of the outer coil is much larger than the inner longitudinal oil gap, so the oil flow through the inner coil is insufficient. The oil flow through the outer coil is excessive, resulting in a mismatch of oil flow between the coils, resulting in a lower temperature rise of the outer coil and a higher temperature rise of the inner coil, which in turn increases the unevenness of the oil flow distribution and increases the oil flow rate. If the temperature is reduced, the cooling conditions will become worse, so th...

AI Technical Summary

Problems solved by technology

However, with the development of power engineering, the application of AC and DC transformers and reactor products is also developing in the direction of high voltage and large capacity, and the loss and geometric size of the coil are also increasing. Only by changing the coil and paper The gap between the barrels can no longer make the oil flow inside the coil evenly distributed, and it can't achieve a good cooling effect, so it can't meet the needs of product development.

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