Oil-cooled transformer with bundle-type radiator

Abstract

The invention discloses an oil-cooled transformer with a bundle-type radiator. The bundle-type radiator comprises a plurality of radiator heat exchange bundles, wherein the plurality of radiator heat exchanger bundles are arranged at two sides of the transformer side by side; the upper ends of the heat exchange bundles are communicated with an upper oil outlet pipe of the transformer; the lower ends of the heat exchange bundles are communicated with a lower oil return pipe of a heat exchanger; air-side spiral fins are spirally distributed on the circumference surfaces of the outer sides of the heat exchange bundles; oil-side spiral fins are arranged on the inner sides of the heat exchange bundles; the air-side spiral fins are connected to the heat exchange bundles in a welding manner; and through holes are evenly processed in the air-side spiral fins and the oil-side spiral fins. According to the oil-cooled transformer with the bundle radiator, disturbance of liquid on the oil side is fully increased; heat exchange is strengthened; meanwhile, a punching treatment is carried out on the spiral fins on the inside and the outside of the heat exchange bundles; boundary layers formed on the spiral fins are destroyed; heat exchange is strengthened; and the heat exchange efficiency of the bundle-type radiator can reach about 8 times of that of a common tube-type radiator.

Description

technical field [0001] The invention relates to the field of enhanced heat dissipation of transformers, in particular to an oil-cooled transformer with a tube-bundle heat dissipation device, in particular to a forced oil circulation air-cooled heat dissipation method for high-power transformer heat dissipation. Background technique [0002] With the improvement of people's living standards, people's demand for energy is gradually increasing, especially for electric energy. The power system is gradually developing in the direction of large capacity, large power grid, and UHV. As one of the important electrical equipment in the power system, the reliability of the transformer becomes particularly important. When the transformer is running, due to the existence of resistance and reluctance, the iron core, coil and steel structure will all generate losses, and this loss will turn into heat energy, causing the transformer to heat up and the temperature will rise, which will great...

AI Technical Summary

Problems solved by technology

When the transformer is running, due to the existence of resistance and reluctance, the iron core, coil and steel structure will all generate losses, and this loss will turn into heat energy, causing the transformer to heat up and the temperature will rise, which will greatly reduce the reliability of the transformer operation. Therefore, how to improve and reduce Transformer temperature becomes even more important

[0003] At present, the radiators for high-power transformers are generally of the forced oil circulation air-cooled type, that is, the hot oil is pumped out by an oil pump and forced into the cooler. The cooler is equipped with a fan to blow and dissipate heat, and the oil flowing out of the cooler enters the bottom of the transformer. , the heat is taken away through the iron core and windings, and this kind of radiator generally uses a tube radiator, which is bulky and has a light tube structure. During the heat exchange process with the air, the flow boundary layer is thicker and the resistance is higher. Large, low heat exchange efficiency, causing the oil temperature to be in a high temperature state, which reduces the insulation resistance of the transformer insulating material, accelerates the aging of the insulating material, and causes partial discharge, resulting in a much lower output capacity than the rated capacity, reducing the efficiency of the transformer, shortening Transformer service life

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