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Power transformer insulation aging state assessment method based on frequency domain Cole-Davidson model

A power transformer, insulation aging technology, applied in the direction of testing dielectric strength, etc., can solve problems such as damage to transformer insulation, aging evaluation errors, complex operation procedures, etc.

Inactive Publication Date: 2014-05-28
济源市科灵电器有限责任公司
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  • Application Information

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Problems solved by technology

[0007] Aiming at the technical problems of the evaluation method of insulation aging state of power transformers, the transformer needs to be treated by lifting the core to extract the insulation paper sample, the operation procedure is complicated and may damage the transformer insulation, and the selection of different areas of the insulation paper sample will bring about the technical problems of aging evaluation errors. The invention provides a method for evaluating the insulation aging state of power transformers based on the Cole-Davidson model in the frequency domain. This method can analyze the aging state of oil-paper insulation without hanging the core, destroying the insulating material, and sampling. In order to accurately evaluate the insulation performance and Provides a reliable basis for predicting remaining life

Method used

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  • Power transformer insulation aging state assessment method based on frequency domain Cole-Davidson model
  • Power transformer insulation aging state assessment method based on frequency domain Cole-Davidson model
  • Power transformer insulation aging state assessment method based on frequency domain Cole-Davidson model

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Embodiment 1

[0039] Such as figure 1 , the principle diagram of the frequency domain dielectric spectrum test of the present invention, the present invention uses the DIRANA-FDS insulation diagnostic analyzer produced by OMICRON, which is used to detect the complex dielectric constant of the oil-paper composite insulation of oil-paper insulated power equipment, including complex dielectric The real part ε' and the imaginary part ε" of the electrical constant.

[0040] figure 2 The operation flowchart for evaluating the insulation aging state of oil-paper insulated power equipment includes the following steps:

[0041] 1) Preparation of power transformer and frequency domain dielectric spectrum tester: disconnect the power transformer from the line; the frequency domain dielectric spectrum tester must be reliably grounded;

[0042] 2) According to the relevant parameters of the tested equipment on site, reasonably select and set the parameters of the frequency domain dielectric spectrum ...

Embodiment 2

[0064] Such as figure 1 , the principle diagram of the frequency domain dielectric spectrum test of the present invention, the present invention uses the DIRANA-FDS insulation diagnostic analyzer produced by OMICRON, which is used to detect the complex dielectric constant of the oil-paper composite insulation of oil-paper insulated power equipment, including complex dielectric The real part ε' and the imaginary part ε" of the electrical constant.

[0065] figure 2 The operation flowchart for evaluating the insulation aging state of oil-paper insulated power equipment includes the following steps:

[0066] 1) Preparation of power transformer and frequency domain dielectric spectrum tester: disconnect the power transformer from the line; the frequency domain dielectric spectrum tester must be reliably grounded;

[0067] 2) According to the relevant parameters of the equipment to be tested on site, reasonably select and set the parameters of the frequency domain dielectric spe...

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Abstract

Disclosed is a power transformer insulation aging state assessment method based on a frequency domain Cole-Davidson model. The method comprises the following steps: 1), carrying out wiring according to instrument instructions; 2), setting parameters; 3), ending testing, and obtaining a frequency domain characteristic parameter fp through spectrum solution; 4), according to the frequency domain characteristic parameter fp and an oil paper insulation temperature T, introducing into a specified formula, and calculating and determining an insulation aging state, i.e., a DP value; and 6), when the average polymerization degree of oil impregnated paper is deceased to 500, determining that the overall insulation of an oil paper insulation electric power device is at a mid-life state; when the average polymerization degree is decreased to 250, determining that the life of the oil paper insulation electric power device is already terminated; and when the polymerization degree is decreased to 150, determining that the mechanical strength of the insulation paper is zero. According to the invention, core suspension is eliminated, insulation materials are not damaged, sampling is unnecessary, the insulation paper average polymerization degree DP value can be accurately assessed, and the oil paper insulation aging state is determined.

Description

technical field [0001] The invention belongs to the field of insulation state diagnosis and life evaluation of power transformers, and in particular relates to a method for evaluating the insulation aging state of power transformers based on a frequency domain Cole-Davidson model. Background technique [0002] Oil-paper composite insulation is an important and excellent insulation combination method, which has been successfully used in large transformers, bushings, transformers, capacitors, cables and other power equipment. During the operation of oil-paper insulated power transformers, the 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, accurately diagnosing the aging state of the oil-paper insulation system of power transformers is crucial to predicting the life of power transf...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 孙新宽汤明杰段丽娜
Owner 济源市科灵电器有限责任公司
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