A four-stage degassing method for insulating oil of UHV transmission and transformation transformers

Abstract

The invention relates to degassing technology of ultrahigh-voltage power transmission transformer insulating oil, in particular to a four-stage degassing method of the ultrahigh-voltage power transmission transformer insulating oil. The four-stage degassing method includes that degassing steps are performed in a four-stage vacuum degassing tower, two-stage spray drying and two-stage thin film evaporation are combined for degassing, spray drying is adopted for first-stage and third-stage degassing, and thin film evaporation is adopted for second-stage and fourth-stage degassing; first-stage spray drying, second-stage thin film evaporation, third-stage spray drying and fourth-stage thin film evaporation are performed sequentially from top to bottom; during first-stage spray drying, a spray device is adopted to distribute oil into a filling layer from the top of the degassing tower in a form of fine liquid drops; during third-stage spray drying, the oil is collected and then sprayed; during second-stage thin film evaporation, a ring structure is adopted; during fourth-stage thin film evaporation, a scroll-type Raschig ring is adopted, so that overflow contact face of the insulating oil is increased. Through above four-stage degassing, gas content can reach less than or equal to 0.07% (by volume ratio).

Description

technical field [0001] The invention relates to the degassing technology of insulating oil of UHV power transmission and transformation transformers, especially the degassing technology of insulating oil of 500KV and above power transmission and transformation transformers. Degassing method. Background technique [0002] UHV power transmission and transformation technology is the most advanced power transmission and transformation technology in the world, and has obvious economic benefits. The treatment of insulating oil for UHV power transmission and transformation equipment is one of the technical difficulties restricting the construction of UHV power transmission and transformation grids [0003] During the transportation, storage, and operation of transformer insulating oil, due to the interference of external factors (such as temperature, pressure, oil flow, etc.), the gas, moisture, and particle impurities generated in the oil will affect the oil quality of transforme...

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Problems solved by technology

[0005] The more commonly used insulating oil degassing treatment methods include: polymer film ventilation method, vacuum degassing method, mechanical vibration method, air blowing method in oil and dynamic headspace method, etc. The most widely used method is vacuum degassing separation Vacuum oil purifiers designed and developed based on the principle of this method are currently widely used, but generally only suitable for transformer insulating oil with a voltage level of 500kV and below

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