Method for evaluating ageing state of paper oil insulation

A technology for oil-paper insulation and aging state, which is applied to measuring devices, instruments, measuring electrical variables, etc., can solve the problem of inability to extract valid information of FDS test results of oil-paper insulation systems, and achieves easy implementation, simple device structure, and improved accuracy. Effect

Active Publication Date: 2013-06-12
GUIYANG BUREAU OF CHINA SOUTHERN POWER GRID CO LTD EHV TRANSMISSION CO
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for evaluating the aging state of oil-paper insulation, which aims to solve the p

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  • Method for evaluating ageing state of paper oil insulation
  • Method for evaluating ageing state of paper oil insulation
  • Method for evaluating ageing state of paper oil insulation

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[0041] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0042] see figure 1 , the method for evaluating the aging state of oil-paper insulation provided by the present invention mainly includes the following steps:

[0043] Step 1: Measure the relative permittivity ε of the oil-paper insulation sample by frequency-domain dielectric spectroscopy r and dielectric loss factor tanδ;

[0044] Step 2: Establish the relative permittivity of the oil-paper insulation test sample Degree of polymerization with insulating paper K DP (t) Composite exponential function relation And the dielectric loss factor tanδ of the oil-paper insulation test product - f(t) and insulation paper polymerization degree K DP (t) Composite exponential function relation K DP (t)=(De -t / E +F)tanδ -f(t);

[0045] St...

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Abstract

The invention discloses a method for evaluating ageing state of paper oil insulation. The method is characterized by comprising the following steps of: 1, measuring a relative dielectric constant and a dielectric loss factor of a paper oil insulation test product by adopting a frequency domain dielectric spectroscopy method; 2, establishing a composite exponential function relational expression of the relative dielectric constant and insulation paper polymerization of the paper oil insulation test product, and a composite exponential function relational expression of the dielectric loss factor and the insulation paper polymerization of the paper oil insulation test product; and 3, evaluating the ageing state of a paper oil insulation system by using the relational expressions. A device provided by the invention is simple in structure, is easily implemented, and is greatly improved in accuracy.

Description

technical field [0001] The invention relates to the technical field of power transmission detection, in particular to a method for evaluating the aging state of oil-paper insulation. Background technique [0002] Converter transformer is one of the important equipment in UHVDC transmission system, and its operation reliability directly affects the safe operation of the whole system. A serious accident of a converter transformer will not only cause its own damage, but also interrupt the power supply, resulting in huge economic losses. In addition to AC voltage, lightning impulse and operating overvoltage, the running converter transformer also bears the effects of DC, AC superimposed DC and polarity reversal voltage. Under the action of these voltages, the distribution of the electric field inside the transformer, the breakdown characteristics of insulating materials, the accumulation and distribution of space charges, etc. are very different from those of ordinary transform...

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Application Information

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IPC IPC(8): G01R27/26
Inventor 吕刚
Owner GUIYANG BUREAU OF CHINA SOUTHERN POWER GRID CO LTD EHV TRANSMISSION CO
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