Method for modifying interfacial properties of transformer oil paper and nano-modified transformer oil paper

A transformer oil and nano-modification technology, applied in the direction of transformer/inductor coil/winding/connection, paper, papermaking, etc., can solve the problem of low insulation performance of composite media, achieve low insulation performance and ease the dielectric constant The difference, the effect of changing the propagation characteristics

Pending Publication Date: 2020-06-12
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] The invention provides a method for modifying the interface properties of transformer oil-paper and nano-modified transformer oil paper, which are used to solve the technical problem that the insulation performance of the existing transformer oil-paper composite medium is not high

Method used

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  • Method for modifying interfacial properties of transformer oil paper and nano-modified transformer oil paper
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  • Method for modifying interfacial properties of transformer oil paper and nano-modified transformer oil paper

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Embodiment 1

[0031] This implementation discloses a method for modifying the interface performance of transformer oil paper, which includes the following steps:

[0032] Dispersed and added spherical TiO to the interface between transformer oil and insulating oil paper in the transformer 2 Nanoparticles or Fe 3 o 4 Nanoparticles, the diameter of the nanoparticles is 20-100nm.

[0033] The method for modifying the performance of the transformer oil-paper interface in the present invention suppresses the accumulation of space charges at the oil-paper interface by dispersing nanoparticles at the oil-paper interface, alleviates the difference in dielectric constant between the transformer oil and the oil-immersed paperboard, and then changes the discharge at the oil-paper interface. The transmission characteristics at the interface improve the flashover performance of the transformer oil-paper interface, thereby solving the technical problem of low insulation performance of the existing tran...

Embodiment 2

[0037] In order to verify the superiority of the method for modifying the interface performance of transformer oil-paper in the present invention and the insulation performance of nano-modified transformer oil-paper, a pure oil-immersed (pure transformer oil) cardboard was prepared to be used together with nano-modified transformer oil-paper in the present invention. Carry out insulation performance control test, the specific content is as follows:

[0038] (1) Preparation of pure oil-impregnated paperboard and nano-oil-impregnated paperboard (i.e. nano-modified transformer oil paper):

[0039] The transformer oil used in this paper is Karamay 25# transformer oil. After filtration, the particle impurity content in the oil meets the standards set by the CIGRE (International Conference on Large Power Grids) working group, and pure transformer oil (abbreviated as pure oil) is obtained. A certain amount of semiconducting TiO 2 The nanoparticles are uniformly dispersed in the pure...

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Abstract

The invention discloses a transformer oil paper interface performance modification method and nano-modified transformer oil paper; in the invention, spherical TiO2 nano particles or Fe3O4 nano particles are dispersedly added into an interface between transformer oil and insulating oil paper in a transformer, wherein the diameter of the nano particles is 20-100 nm. Compared with the prior art, nanoparticles are added to inhibit the accumulation phenomenon of space charges at an oil-paper interface, so that the dielectric constant difference between transformer oil and an oil-immersed paper board is relieved, and then the propagation characteristic of discharge at the interface is changed; therefore, the flashover performance of the transformer oil-paper interface is improved, and therefore the technical problem that an existing transformer oil-paper composite medium is not high in insulating property is solved.

Description

technical field [0001] The invention relates to the technical field of high-voltage insulation, in particular to a method for modifying the interface performance of transformer oil-paper and nano-modified transformer oil-paper. Background technique [0002] As the key equipment of the power system, power transformers cause more than 80% of transformer failures at 110kV and above due to insulation failures. Oil-paper insulation is the main insulation structure of oil-immersed power transformers, and its insulation performance directly affects the operation stability of power transformers. The oil-paper interface is usually the weak point of the insulation, and the surface discharge along the pads between the coil cakes and the screen is one of the most common faults in the transformer. Due to the difference in the dielectric constant of the oil-paper medium, the surface structure of the paperboard, and the distribution of moisture content, the discharge is more likely to dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/67D21H17/00D21H21/52D21H27/12H01B3/52H01F27/32
CPCD21H17/00D21H17/675D21H21/52H01B3/52H01F27/32
Inventor 周游周文涛陈维捷彭能隋三义杨鑫
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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