A new type of anti-aging mixed insulating oil for transformers and its preparation method

Abstract

The invention relates to novel transformer anti-aging mixed insulating oil and a preparation method thereof. The novel transformer anti-aging mixed insulating oil mainly comprises the following raw materials in percentage by weight: 15% of rapeseed oil and 85% of mineral insulating oil. The novel mixed insulating oil disclosed by the invention meets the requirement of GB 2536-2011 in various physicochemical and electric indexes and can be directly added in the traditional mineral oil transformer. Compared with the mineral insulating oil, the novel mixed insulating oil disclosed by the invention can be used for obviously delaying the ageing speed of the solid insulation of a transformer and prolonging the service life of the transformer; compared with plant insulating oil, the novel mixed insulating oil disclosed by the invention can be used for obviously enhancing the radiating property of the transformer, and preventing the traditional transformer radiating system from being rebuilt; and compared with already developed olive oil-mineral oil type mixed oil, the novel mixed insulating oil disclosed by the invention can be used for obviously reducing the development cost of insulating oil and is favorable to large-area popularization.

Description

technical field [0001] The invention relates to a novel anti-aging mixed insulating oil for transformers and a preparation method thereof. Background technique [0002] The transformer is the most critical and expensive core component of the power system. The reliable operation of the power grid requires that the transformer can run safely for a long time. The condition of a transformer depends primarily on the condition of its insulation system. The insulation system of the transformer is composed of insulating oil and insulating paper. The insulating oil has two functions of insulation and heat dissipation, and is an indispensable part of the insulation system. On-site transformers are gradually aging under the influence of electricity, heat and other factors during long-term operation. The deterioration of insulating oil will increase the hygroscopicity of the insulating oil, increase the water content, reduce the insulation performance, and greatly reduce the cooling, h...

AI Technical Summary

Problems solved by technology

[0003] The existing transformer oil mainly uses mineral oil, which has the following disadvantages: 1) The aging rate of the transformer insulation system will increase with the increase of moisture content, and the water saturation of mineral insulating oil is very low, which is not conducive to inhibiting the impact of moisture on the oil paper. The impact of insulation aging; 2) Mineral oil is a primary energy source, facing the threat of future oil production reduction and depletion; 3) Poor biodegradability, once leaked, it will cause pollution to water sources and living environments

4) The flash point and fire point are low, it is difficult to meet the requirements of high fire performance

However, the mixed oil still has two defects: 1) olive oil is used as a raw material, and olive oil is expensive, which will greatly increase the production cost of insulating oil and limit its wide-scale promotion; 2) in order to improve the oxidation of the mixed oil Stability, Chongqing University added an antioxidant alkylated phenyl-α-naphthylamine to the mixed oil, which will improve the dielectric loss of insulating oil

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