An underground oil-immersed transformer with graded cooling device

Abstract

The invention relates to a buried oil-immersed transformer with stage cooling devices. The buried oil-immersed transformer comprises a transformer body, three stage cooling devices and a cooling control system, wherein a first stage cooling device comprises an oil box, transformer oil and cooling fins at the periphery of the oil tank, a second stage cooling device comprises an oil pump, a circulation cooling pipeline, a water tank and a gravity assisted heat pipe, the circulation cooling pipe line comprises a ground cooling segment pipeline and an air cooling segment pipeline, a heat absorption end of the gravity assisted heat pipe and the ground cooling segment pipeline are immersed in water in the water tank, the water tank and the gravity assisted heat pipe are both buried under a ground surface of a basement, a third stage cooling device comprises a ventilation pipeline and a cooling fan, the control system comprises a temperature sensor, a controller and a frequency converter, two signal output ends of the controller are respectively connected with the frequency converter and a control end of the cooling fan. The heat dissipation condition of the buried oil-immersed transformer can be intelligently controlled according to a temperature of an environment where the transformer is located and a load size, and the adaptive capacity to the environment and the overload capacity of the oil-immersed transformer are improved.

Description

technical field [0001] The invention belongs to the technical field of buried oil-immersed transformers, and in particular relates to a buried oil-immersed transformer with a graded cooling device. Background technique [0002] Buried oil-immersed transformers are installed in basements or cellars, suitable for urban environments, especially for densely populated central cities. When the transformer is running, the heat generated by the loss of the winding and core must be dissipated in time to avoid overheating that reduces the service life or causes damage to the transformer. [0003] The temperature inside the transformer is related to the ambient temperature of the transformer and the load of the transformer. The environment of the basement or cellar is closed, and the cooling device of the buried oil-immersed transformer is required to have a heat dissipation method suitable for its environment. Traditional air cooling, water cooling, etc. It is difficult to adapt to t...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages that the above-mentioned buried oil-immersed transformer is difficult to adapt to the heat dissipation requirements of the closed environment in the basement, so that the environmental adaptability and overload capacity of the transformer are adversely affected, and to provide a buried oil-immersed transformer with a graded cooling device. transformer

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