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Method and device for detecting insulation aging state of oil-paper insulation electric power equipment

A state detection device, oil-paper insulation technology, applied in the field of electric power, can solve problems such as complex operation procedures, aging evaluation errors, and damage to transformer insulation

Inactive Publication Date: 2013-09-18
SHENZHEN POWER SUPPLY BUREAU +1
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Problems solved by technology

[0007] However, in the prior art method for detecting the insulation aging state of oil-paper insulated power equipment, the transformer needs to be core-hanging to extract the insulation paper sample. Technical issues of error in aging assessment

Method used

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  • Method and device for detecting insulation aging state of oil-paper insulation electric power equipment
  • Method and device for detecting insulation aging state of oil-paper insulation electric power equipment
  • Method and device for detecting insulation aging state of oil-paper insulation electric power equipment

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Embodiment 1

[0119] like Figure 4 As shown, Embodiment 1 of a method for detecting the insulation aging state of oil-paper insulated power equipment provided by the present invention includes:

[0120] Step 100, detecting the complex permittivity of the oil-paper composite insulation of the oil-paper insulated power equipment, including the real part ε' and the imaginary part ε" of the complex permittivity;

[0121] In this embodiment, the parameters of the frequency-domain dielectric spectrum tester are set as U0max=200V, the highest test frequency fH=1kHz, and the lowest test frequency fL=1mHz.

[0122] Step 101, using the double-relaxation Cole-Cole model equation to fit the measured complex permittivity, and extract characteristic parameters characterizing the polarization process of the oil-paper insulation;

[0123] Step 102, judging the aging state of the oil-paper insulated power equipment according to the characteristic parameters.

[0124] The complex permittivity represented ...

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Abstract

The invention provides a method and a device for detecting the insulation aging state of oil-paper insulation electric power equipment. The method includes the steps: detecting a real part epsilon' and an imaginary part epsilon'' of the complex dielectric constant of oil-paper combination insulation of the oil-paper insulation electric power equipment; fitting the detected complex dielectric constant by the aid of a double relaxation Cole-Cole model equation to extract characteristic parameters representing the oil-paper insulation polarization process from the complex dielectric constant; and judging the aging state of the oil-paper insulation electric power equipment according to the characteristic parameters. By the method and the device for detecting the insulation aging state of the oil-paper insulation electric power equipment based on a double relaxation Cole-Cole model, the aging state of oil-paper insulation can be analyzed without suspending cores, damaging insulation materials or sampling, and reliable basis is provided for accurately evaluating the insulation performance of the oil-paper insulation electric power equipment and forecasting remaining life.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a method and a device for detecting the insulation aging state of oil-paper insulated power equipment based on a double-relaxation Cole-Cole model. Background technique [0002] Oil-paper composite insulation is an important and excellent insulation combination method, which has been widely used in large transformers, bushings, transformers, capacitors, cables and other power equipment. During the operation of oil-paper insulated power equipment, its oil-paper insulation is subjected to various external stresses such as heat, electricity, machinery, and chemistry for a long time, which leads to a gradual decline in its own insulation and mechanical properties and may cause failure. Therefore, accurate diagnosis of the aging state of the oil-paper insulation system is very important to predict the life of oil-paper insulation power equipment, and it is also the ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 余鹏张冠军田杰汤明杰李元
Owner SHENZHEN POWER SUPPLY BUREAU
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