Oiled paper sleeve damp positioning method based on polarity inversion time domain dielectric response
An oil-paper bushing and polarity reversal technology, which is applied in the direction of testing dielectric strength, measuring electricity, and measuring electrical variables, etc., can solve the problems of enhanced partial discharge and reduced insulation strength of oil-paper bushings, and achieve on-site testing and operation. simple effect
Active Publication Date: 2020-11-03
XI AN JIAOTONG UNIV
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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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[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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The invention discloses an oilpaper sleeve damp positioning method based on polarity reversal time domain dielectric response, and the method comprises the following steps: 1) carrying out a PDC testbased on polarity reversal time domain dielectric response on an oilpaper sleeve, and adopting a comparison test of two wiring modes; 2) drawing polarization current / depolarization current time curvesof the two wiring modes, or drawing a polarization current / depolarization current difference time curve of the two wiring modes; 3) judging that the oiled paper sleeve is damped and positioned according to the difference of the polarization current / depolarization current time curves of the two wiring modes or the shape of the polarization current / depolarization current difference time curve of the two wiring modes. The method is not easily influenced by external interference, test excitation voltage amplitude, foreign ions and the like, and the damp positioning result is accurate; the specific damped part of the oil paper sleeve can be obtained; and the to-be-tested oil paper sleeve is not damaged, so the field test of the oil paper sleeve can be better realized.
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...
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Login to View More 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