Modified transformer oil, preparation method and application

Abstract

The invention relates to modified transformer oil. The modified transformer oil consists of base oil and heat-conducting two-dimensional nanosheets dispersed in the base oil; the thickness of the heat-conducting two-dimensional nanosheets is less than 30nm, the sheet diameter is less than 500nm, and the ratio of thickness to radial dimension is less than 1. Since the invention adds the two-dimensional nanosheets in the base oil of the transformer oil, the two-dimensional structures are utilized to form electron traps in the transformer oil, the anisotropy of electron transfer can enhance the distortion of a local electric field in the transformer oil, thus impeding the development of streams and playing an insulating role, and thereby the anti-breakdown property of the transformer oil is effectively increased; the two-dimensional nanosheets added by the invention can form a nanofluid system along with the transformer oil, the heat conductivity coefficient is high, and the heat dispersion of the transformer oil is increased.

Description

technical field [0001] The invention belongs to the field of transformer oil modification, and in particular relates to a modified transformer oil, a preparation method and an application. Background technique [0002] In order to enhance the insulation performance and heat dissipation performance of the transformer, most of its iron core and winding are immersed in an oil tank filled with transformer oil, which is called an oil-immersed transformer. [0003] Transformer oil is the most important special lubricating oil among electrical insulating oils. Its demand accounts for more than 98% of the total demand for electrical insulating oil. It is mainly used as the insulation and heat conduction medium of transformers, and plays the role of insulation protection, heat dissipation and cooling, and arc extinguishing. role. The quality and performance of transformer oil are related to the safe operation of the power grid, and are closely related to industrial production and re...

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Problems solved by technology

CN105132079A discloses a preparation method of aluminum nitride nanoparticle modified transformer oil, but does not report the effect of improving the performance of transformer oil after modification

CN105296108A discloses a mixed modified nano-particle transformer oil and its preparation method, using modified nano-silicon dioxide and boron nitride composite nanoparticles in the transformer oil, using ultrasonic dispersion and mechanical stirring as the main treatment process, but not The improvement effect of composite nanoparticles on transformer oil has not been reported

However, due to the isotropic characteristics of zero-dimensional nano-insulation particles, the distortion effect on the local electric field is limited, so the improvement of the anti-breakdown performance of transformer oil is limited; on the other hand, due to the low thermal conductivity of zero-dimensional nano-insulation particles, it is necessary to The thermal conductivity of transformer oil can be improved only with a large amount of addition, but the viscosity of transformer oil is low, and the stability of the high-solid content system is poor, so it is difficult to obtain stable nano-transformer oil products

Therefore, zero-dimensional nano-insulating particles have limited effect on improving the insulation and thermal conductivity of transformer oil.

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