Method and equipment for evaluating moisture content of oil paper insulation
A technology of oil-paper insulation and moisture, which is applied in the field of oil-paper insulation, can solve the problems of low measurement accuracy, achieve the effects of improving accuracy, reducing errors, and simplifying the process of obtaining moisture content
Active Publication Date: 2021-11-02
SHENZHEN POWER SUPPLY BUREAU
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Problems solved by technology
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
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[0058] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the application are given in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.
[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the specification of the application is only for the purpose of describing specific embodiments, and is not intended to limit the application.
[0060] It can be understood that the terms "first", "second" and the like used in this application ca...
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The invention relates to a method and equipment for evaluating moisture content of oil paper insulation. The method comprises the steps: obtaining a water content mean value of an oil paper insulation test sample with non-uniform water content, and performing frequency domain dielectric spectrum test on the water content mean value to obtain a first complex dielectric constant real part curve; comparing the first complex dielectric constant real part curve with a preset complex dielectric constant real part curve to determine a first ordinate difference value set; performing a frequency domain dielectric spectrum test on to-be-tested oil paper insulation to obtain a second complex dielectric constant real part curve, and comparing the second complex dielectric constant real part curve with a preset complex dielectric constant real part curve to determine a second ordinate difference value; determining a first ordinate difference value closest to the second ordinate difference value; determining a first water content corresponding to the closest first ordinate difference value; and obtaining a second water content according to a preset water content prediction model, and determining the water content of the to-be-detected oil paper insulation according to the first water content and the second water content. Through the method, the accuracy of evaluating the water content of the oil paper insulation is improved.
Description
technical field [0001] The present application relates to the technical field of oil-paper insulation, in particular to a method and equipment for evaluating the moisture content of oil-paper insulation. Background technique [0002] The oil-paper insulation system is the main component of the high-voltage insulation system of oil-immersed power transformers. Its good insulation performance is the basis for the effective operation of transformers and even the entire power system. The deterioration of insulating oil can be solved by replacing oil or filtering oil, but no effective measures have been proposed for the deterioration of insulating paper. The service life of the transformer is mainly affected by the insulation state of the oil-paper insulation. Excessive moisture in the insulation system will seriously affect the insulation performance, and bring a series of consequences including accelerated aging rate, shortened insulation life and reduced partial discharge inc...
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IPC IPC(8): G01N27/22
CPCG01N27/221G01N27/223
Inventor 李艳田杰梁兆杰张大宁
Owner SHENZHEN POWER SUPPLY BUREAU