A liquid nitrogen strong cooling transformer and its refrigeration method

Abstract

The invention relates to a liquid nitrogen strong cooling transformer and a refrigerating method thereof. The transformer comprises a transformer oil tank and a liquid nitrogen tank; the liquid nitrogen tank is connected with a liquid nitrogen outlet pipe; the transformer oil tank is connected with a gas nitrogen outlet pipe; an evaporating pipe is coiled in the transformer oil tank; one end of the evaporating pipe is communicated with the liquid nitrogen outlet pipe and the other end of the evaporating pipe is communicated with the gas nitrogen outlet pipe; the gas nitrogen outlet pipe is sequentially provided with a liquid nitrogen compressor, a condenser and a throttling valve; the tail end of the gas nitrogen outlet pipe extends into the liquid nitrogen tank; a temperature sensor is arranged in the transformer oil tank; and the liquid nitrogen outlet pipe is provided with a heat preservation electromagnetic valve electrically connected with the temperature sensor. The liquid nitrogen strong cooling transformer and the refrigerating method thereof have the beneficial effects that 1, heat exchange is carried out between liquid nitrogen and transformer oil, heat exchange efficiency is high and gas nitrogen is retransformed into liquid nitrogen by the liquid nitrogen compressor and the condenser and is recycled; and 2, the transformer oil in upper and lower cavities of the transformer oil tank is repeatedly circulated by a transformer oil circulating pipe and a circulating oil pump so as to enable the oil temperature to be balanced.

Description

technical field [0001] The invention belongs to a transformer cooling system, in particular to a liquid nitrogen forced cooling transformer utilizing liquid nitrogen for forced cooling and a cooling method thereof. Background technique [0002] Transformers are commonly used electrical equipment in production and life. They mainly have the functions of raising and lowering voltage, matching impedance and safety isolation. According to the cooling method, transformers can be divided into dry-type transformers and oil-immersed transformers. Among them, dry-type transformers rely on air convection for natural cooling or increase fan cooling, and are mostly used for high-rise buildings, high-speed toll stations, local lighting, electronic Small-capacity transformers such as lines; oil-immersed transformers mainly rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling, forced oil circulation, etc., to reduce the ...

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Problems solved by technology

[0005] The present invention mainly aims at the problems of high cost, low heat exchange efficiency and long cooling time in the existing transformer oil water-cooled heat exchange cooling method, and provides a recyclable, low cost, high heat exchange efficiency and long cooling time. Short liquid nitrogen strong cooling transformer and its refrigeration method

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