Transformer oil-paper insulation frequency domain dielectric loss integral reduction method under different temperature

A technology of oil-paper insulation and transformer oil, which is applied to instruments, measuring electrical variables, testing dielectric strength, etc., can solve problems such as the impact of response test results, and achieve accurate analysis results.

Inactive Publication Date: 2017-07-14
CHINA THREE GORGES UNIV
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Problems solved by technology

[0005] Aiming at the problem of the influence of different temperature environments on the frequency-domain dielectric response test results of the transformer oil-paper insulation s...

Method used

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  • Transformer oil-paper insulation frequency domain dielectric loss integral reduction method under different temperature
  • Transformer oil-paper insulation frequency domain dielectric loss integral reduction method under different temperature
  • Transformer oil-paper insulation frequency domain dielectric loss integral reduction method under different temperature

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Embodiment

[0052] Such as figure 1 As shown, the method provided by the present invention converts the frequency-domain dielectric characteristic parameters of transformer oil-paper insulation into the same temperature-related function expression at different temperatures, and uses two samples of oil-paper insulation moisture and aging samples to test the effect of different measurement temperatures on The influence of the oil-paper insulation system, so as to more accurately analyze the influence of different ambient temperatures on the test results of the frequency-domain dielectric response of the transformer oil-paper insulation system. The specific steps are as follows:

[0053] 1: Complete the construction of the experimental platform and the preparation of oil-paper insulation moisture and aging test samples in the laboratory. In order to reduce the experimental error, each insulation paper

[0054] The quality of the boards is basically equal, the moisture content of the insulat...

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Abstract

The invention provides a transformer oil-paper insulation frequency domain dielectric loss integral reduction method under different temperature. An oil-paper insulation moisture and aging test product is prepared, and the characteristic quantity-frequency domain dielectric loss integral of the dielectric loss cumulative value of a certain frequency domain section of the oil-paper insulation test product under five different temperature is measured by using an insulation diagnostic instrument IDAX-300; the maximum value of the dielectric loss integral area of the oil-paper insulation moisture and aging test product at the 0.1-10Hz frequency band is acquired, and the maximum value of the dielectric loss integral area acts as a characteristic parameter; and fitting of the measurement temperature and the maximum value of the frequency domain dielectric loss integral area is performed through the least square method so that an expression of the frequency domain dielectric loss integral and aging and wetting under different temperature is acquired. Conversion of the frequency domain dielectric loss integral characteristic quantity under different temperature can be effectively performed so that accurate analysis of the test result of the transformer oil-paper insulation system frequency domain dielectric loss integral under different environmental temperature can be realized, and the influence of the measurement temperature on the transformer insulation state assessment through the frequency domain dielectric loss integral characteristic quantity can be eliminated.

Description

technical field [0001] The invention relates to the field of transformer oil-paper insulation state detection, in particular to a method for reducing integrals of dielectric loss in the frequency domain of transformer oil-paper insulation at different temperatures. Background technique [0002] As the core equipment in the process of power transmission and distribution, power transformers are closely related to the operation stability of the entire power system. The main component of the transformer main insulation system is the oil-paper insulation system. During the long-term operation of the transformer, due to the influence of various factors such as machinery, moisture, chemistry, heat, and electricity, the oil-paper insulation system will gradually deteriorate, resulting in a decline in the oil-paper insulation performance. The traditional test methods for diagnosing the aging state of transformer oil-paper insulation mainly include acid value analysis in oil, furfura...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R27/26
CPCG01R31/1263G01R27/2694
Inventor 张涛张晓林周远化刘雅琴
Owner CHINA THREE GORGES UNIV
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