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Method for assessing nonuniform humidity degrees of oil-paper insulation components

A technology of insulating components and oil-impregnated paper, which is applied in the field of evaluating the uneven moisture content of oil-impregnated paper insulating components, which can solve the problems of low measurement accuracy, low measurement accuracy, and damage to equipment insulation, so as to improve accuracy and precision , the effect of non-destructive testing process

Active Publication Date: 2018-04-24
SHENZHEN POWER SUPPLY BUREAU +1
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Problems solved by technology

The first two measurements must take samples to destroy the insulation of the equipment. The weighing method has been replaced by the Karl-Fisher method because of its low measurement accuracy.
The oil-soaked paper moisture balance curve method first measures the moisture content in the oil, and then estimates the water content in the paper according to the oil-soaked paper moisture balance curve. This method is easy to operate and will not damage the equipment insulation, but the measurement accuracy is low

Method used

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  • Method for assessing nonuniform humidity degrees of oil-paper insulation components
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  • Method for assessing nonuniform humidity degrees of oil-paper insulation components

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Embodiment Construction

[0027] Embodiments of the present invention will be illustrated below with reference to the accompanying drawings.

[0028] figure 1 It is a schematic flowchart of an embodiment of a method for evaluating the degree of uneven damping of an oil-impregnated paper insulation assembly according to the present invention. The applicable object of the invention is the insulation system of equipment such as oil-immersed transformer, oil-paper bushing and oil-immersed capacitor.

[0029] Step S1, combining the plurality of uniformly damp oil-soaked paper insulation samples in different ways to form a plurality of non-uniformly damp oil-soaked paper samples, and performing frequency-domain dielectric spectroscopy on each non-uniformly damp oil-soaked paper sample Test to obtain a plurality of first dielectric spectrum curves, and establish a corresponding relationship between each of the first dielectric spectrum curves and the moisture content of each non-uniform oil-impregnated paper...

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Abstract

The invention provides a method for assessing nonuniform humidity degrees of oil-paper insulation components. The method includes: step S1, adopting a plurality of uniformly humidified oil-paper insulation samples for forming a plurality of non-uniformly humidified oil-paper samples, subjecting each oil-paper sample to frequency domain dielectric spectrum testing to obtain a plurality of first dielectric spectrum curves, and establishing a corresponding relationship between each first dielectric spectrum curve and the humidity degree of each oil-paper sample; step S2, subjecting a practical oil-paper insulation component to frequency domain dielectric spectrum testing to obtain a second dielectric spectrum curve, and when similarity of the second dielectric spectrum curve to one of the first dielectric spectrum curves reaches a preset requirement, taking the corresponding humidity degree of the corresponding first dielectric spectrum curve as the humidity degree of the practical oil-paper insulation component. The method has the advantage that the oil-paper insulation non-uniform humidity degrees are estimated according to frequency domain dielectric spectrum characteristic peaks.Compared with an existing method, the method has advantages that accuracy in oil-paper insulation humidity assessment is improved, and detailed humidity conditions can be obtained.

Description

technical field [0001] The invention relates to the technical field of power transmission detection, in particular to a method for evaluating the degree of uneven dampness of an oil-immersed paper insulation assembly. Background technique [0002] Oil-impregnated paper insulation is one of the most commonly used insulating materials for power equipment. It is mainly used in the insulation system of oil-immersed transformers, oil-impregnated paper bushings and oil-immersed capacitors. In the power grid system of 110kV and above, the proportion of oil-impregnated paper insulation reaches more than 93%. Among them, the capacitive high-voltage bushing is one of the typical oil-impregnated paper insulation devices, and it is an indispensable external connection component of the power transformer. It not only has the function of leading the winding leads out of the transformer, but also bears the role of supporting and fixing the leads. The data show that the bushing accidents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/221G01N27/223
Inventor 田杰余鹏张大宁张冠军
Owner SHENZHEN POWER SUPPLY BUREAU
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