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Diffusion measurement evaluation method for water in oil paper of oil-immersed transformer

A technology of oil-immersed transformers and transformers, applied in measuring devices, diffusion analysis, instruments, etc., can solve problems such as damage to insulation, and achieve the effect of a comprehensive life evaluation method

Inactive Publication Date: 2017-02-22
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

The accelerated moisture transfer also causes the oil flow at the interface of the oil-paper insulation to be electrified, destroying the insulation

Method used

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  • Diffusion measurement evaluation method for water in oil paper of oil-immersed transformer
  • Diffusion measurement evaluation method for water in oil paper of oil-immersed transformer
  • Diffusion measurement evaluation method for water in oil paper of oil-immersed transformer

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Embodiment Construction

[0050] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] Such as figure 1 As shown, this method includes the following steps: 1) Transformer insulating paper sample preparation, cutting 3 groups of transformer insulating paper samples with fixed quality and a group of insulating cardboard, placing them in a vacuum box at 105 ° C, drying at 50 Pa for 4 hours, and then cooling to 20°C, immersed in new oil for 48 hours, and then put each group of paper samples in N 2 Put them into 1000mL flasks cleaned with acetone and dry and clean under the environment, inject 700mL of #25 Karamay oil according to the mass ratio of oil to paper at a ratio of 20:1, fill it with nitrogen to an atmospheric pressure and seal it; 2) Insulate the After paper pretreatment, select and control the test samples with different initial moisture content for accelerated thermal aging test, and measure the degree of poly...

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Abstract

The invention discloses a diffusion measurement evaluation method for water in oil paper of an oil-immersed transformer. The diffusion measurement evaluation method comprises the following steps: firstly, preparing a transformer insulating paper sample; secondly, testing the mechanical strength of a polymer of an aged paper board; thirdly, establishing an extrapolation life model under the thermal aging temperature; fourthly, establishing an extrapolation life model under any thermal aging temperature and initial water content; fifthly, analyzing hot-spot temperature of a transformer winding, micro-water content in oil and real-time oil temperature data of the transformer. According to an insulation thermal aging life evaluation method of the oil paper based on a time-temperature water superimposition method, provided by the invention, accelerated aging data under high-temperature high initial water content can be extrapolated to data of low-temperature low water content under operation conditions, the defects in a traditional time-temperature superposition model can be overcome, and a more accurate and comprehensive life evaluation method is provided.

Description

technical field [0001] The invention relates to a method for measuring and evaluating moisture diffusion in oil-paper of an oil-immersed transformer, and belongs to the technical field of monitoring and evaluating oil-paper-immersed transformers. Background technique [0002] The oil-immersed power transformer plays an important role in the distribution, stability and operation economy of power transmission in the power grid. It is an important power equipment in the operation of the power grid. [0003] The micro-moisture content and distribution of micro-moisture in the oil-paper insulation system of transformers are important basis for evaluating the insulation state of transformers. Wet insulating paper will seriously affect the internal insulation characteristics of the transformer. Moisture can seriously reduce the mechanical strength and electrical strength of oil-paper insulation, which will reduce the insulation resistance and increase the dielectric loss factor, t...

Claims

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Application Information

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IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 张沛红赵卓林孙略卢浩
Owner HARBIN UNIV OF SCI & TECH
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