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A Moisture Location Method for Oil-Paper Casings Based on Polarity Reversal Time Domain Dielectric Response

A technology of oil-paper bushing and polarity reversal, which is applied in the direction of testing dielectric strength, measuring electricity, measuring electrical variables, etc., and can solve the problems of reduced dielectric strength and enhanced partial discharge of oil-paper bushings, etc.

Active Publication Date: 2021-09-10
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Local high moisture will generate bubbles under high temperature or high field strength, which will enhance the partial discharge and reduce the insulation strength of the oil-paper bushing

Method used

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  • A Moisture Location Method for Oil-Paper Casings Based on Polarity Reversal Time Domain Dielectric Response
  • A Moisture Location Method for Oil-Paper Casings Based on Polarity Reversal Time Domain Dielectric Response
  • A Moisture Location Method for Oil-Paper Casings Based on Polarity Reversal Time Domain Dielectric Response

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Embodiment Construction

[0052] The present application is described in detail below in conjunction with the examples, but the present application is not limited to these examples.

[0053] In the wet positioning method of the oil-paper sleeve of the present application, the applicable radial thickness of the oil-paper sleeve is 2-15 mm, preferably 4-10 mm, and more preferably 5-8 mm.

[0054] For the actual oil-paper casing and the casing experimental model, when the moisture is not uniform, the internal moisture content increases or decreases along the radial direction, thus forming a moisture gradient, as figure 1 shown.

[0055] In order to facilitate the description of the mechanism of the positioning method of the present application, the oil-paper casing models of different damp positions are constructed. The radial water content distribution of the oil-paper casing is shown in Table 1, and the casing model is shown in Table 1. figure 2 As shown, wherein, the thickness of each layer of oil pa...

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Abstract

The present application discloses and provides a method for locating oil-paper bushings affected by moisture based on polarity reversal time-domain dielectric response, which includes the following steps: 1) performing a polarity-reversal time-domain dielectric response based on oil-paper bushing PDC test, a comparative test of two wiring methods; 2) Draw the polarization current / depolarization current-time curve of the two wiring methods, or draw the polarization current / depolarization current difference of the two wiring methods- Time curve; 3) According to the difference of the polarization current / depolarization current-time curve of the two connection methods or the shape of the polarization current / depolarization current difference-time curve of the two connection methods, determine the oil-paper bushing Damp location. This method is not easily affected by external interference, test excitation voltage amplitude, and impurity ions, etc., and the damp location result is accurate; the specific damp part of the oil-paper bushing can be obtained; the oil-paper bushing to be tested is not damaged, which is more conducive to realizing the oil-paper bushing. testing on the spot.

Description

technical field [0001] The application relates to a method for locating dampness of oil-paper bushings based on polarity reversal time-domain dielectric response, which belongs to the technical field of electrical equipment performance evaluation. Background technique [0002] With the rapid development of my country's electric power industry, a large number of high-voltage, large-capacity transformers, reactors and other power equipment have been put into operation, which puts forward higher requirements for the maintenance level of on-site equipment. As an important part of the external insulation of large oil-paper insulated transformers, high-voltage oil-paper insulating bushings have the characteristics of large usage, high price and excellent insulation performance. Their insulation performance directly affects the stable operation of transformers. Therefore, the scientific and effective diagnosis and evaluation of its insulation state determines the safety and stabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1245
Inventor 张大宁穆海宝张冠军赵浩翔丁宁姚欢民
Owner XI AN JIAOTONG UNIV
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