Evaluation method for paper oil insulation aging state through characteristic parameters based on time domain dielectric response

A technology of characteristic parameters and dielectric response, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as space charges that endanger the oil-paper medium of transformers, and achieve the effects of high sensitivity and simple operation.

Active Publication Date: 2013-07-10
GUIYANG BUREAU OF CHINA SOUTHERN POWER GRID CO LTD EHV TRANSMISSION CO
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Problems solved by technology

There is no in-depth research report on the influence of the properties of insulating oil and insulating paper on the formation and migration of space charges during the aging process of oil-paper insulating media.

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  • Evaluation method for paper oil insulation aging state through characteristic parameters based on time domain dielectric response
  • Evaluation method for paper oil insulation aging state through characteristic parameters based on time domain dielectric response
  • Evaluation method for paper oil insulation aging state through characteristic parameters based on time domain dielectric response

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[0039] 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.

[0040] see Figure 14 The process of the method for evaluating the aging state of oil-paper insulation based on the characteristic parameters of the time-domain dielectric response provided by the present invention includes the following steps:

[0041] Step S1: measuring the polarization / depolarization current of the system;

[0042] Step S2: Simulate the equivalent circuit of the polarization / depolarization current, and calculate the circuit parameters of the equivalent circuit model to obtain the depolarization current;

[0043] Step S3: smoothing the depolarization current, and fitting to obtain the depolarization electric quantity;

[0044] Step S4: Establish a functional relationship between the aging time and the characteristic ...

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Abstract

The invention discloses an evaluation method for a paper oil insulation aging state through characteristic parameters based on time domain dielectric response. The evaluation method for the paper oil insulation aging state through the characteristic parameters based on the time domain dielectric response comprises the steps of measuring a polarization and depolarization current of a system, simulating an equivalent circuit of the polarization and depolarization current, calculating circuit parameters of an equivalent circuit model to obtain a depolarization current, smoothing the depolarization current and fitting the depolarization current to obtain depolarization power quantity, building a function relationship of aging time and characteristic parameters of the depolarization power quantity, integrating the relationship between the polymerization degree changing rule and the characteristic parameters of the depolarization power quantity through combining a first order dynamical model of a polymerization degree changing rule of mineral paper oil insulation acceleration thermal aging. By the utilization of the evaluation method for the paper oil insulation aging state through the characteristic parameters based on the time domain dielectric response, the operation is simple, sensitivity is high, and the evaluation method for the paper oil insulation aging state through the characteristic parameters based on the time domain dielectric response is suitable for the use of engineering.

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 based on characteristic parameters of time-domain dielectric response. 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 s...

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Application Information

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IPC IPC(8): G01R31/00G01N27/60
Inventor 吕刚
Owner GUIYANG BUREAU OF CHINA SOUTHERN POWER GRID CO LTD EHV TRANSMISSION CO
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