A damp location method for oil-paper casing based on polarity inversion frequency domain dielectric response
A technology of oil-paper casing 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 enhanced partial discharge and reduced dielectric strength of oil-paper casing.
Active Publication Date: 2021-09-10
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
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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 present application discloses and provides a moisture locating method for oil-paper casing based on polarity inversion frequency-domain dielectric response, which includes the following steps: 1) Carrying out a method for oil-paper casing based on polarity inversion frequency-domain dielectric response FDS test, the specific test method is a comparative test using two wiring methods; 2) According to the FDS test results obtained in step 1), draw the tanδ-f curves of the two wiring methods, or draw the tanδ difference between the two wiring methods- f curve; 3) According to the difference between the tanδ-f curves of the two connection methods obtained in step 2) or the shape of the tanδ difference-f curve, determine the moisture location of the oil-paper casing. 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 sleeve can be obtained through this damp location method; The pipe is not damaged, which is more conducive to the field test of the oil-paper casing.
Description
technical field [0001] The application relates to a method for locating dampness of oil-paper bushings based on polarity inversion frequency-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 s...
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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