A Method for Evaluating the Aging State of Transformer Oil-paper Insulation Using the Growth Rate of Depolarization Electricity
A technology for oil-paper insulation and aging state, which is applied in the measurement of electrical variables, instruments, and electricity. It can solve problems such as difficulty, insulation damage, and inability to reliably reflect the insulation state, and achieve the effect of convenient aging state of transformer oil-paper insulation.
Active Publication Date: 2020-09-01
CHONGQING UNIV
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Problems solved by technology
Due to the influence of various factors such as oil filtering in the middle of the transformer, the test results of oil chemical parameters cannot reliably reflect the insulation condition
Although the degree of polymerization can truly reflect the aging degree of oil-paper insulation, the measurement of the degree of polymerization requires the transformer to be drained and the transformer to be sampled at several representative parts of the winding, which is difficult to implement and will cause damage to the insulation. damage
Method used
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Embodiment Construction
[0042] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0043] Such as figure 1 As shown, the present invention specifically comprises the following steps:
[0044] 1. In order to obtain oil-paper insulation samples in different aging states, according to figure 2 The thermal aging flow chart shown was prepared. Firstly, put the winding in the insulating oil. On both sides of the copper bar of the winding, there are 10 layers of ordinary cellulose insulating paper with a thickness of 75 μm. The length and width of the winding are 12cm×2.8cm, as shown in image 3 As shown; and loaded with pre-dried cardboard, so that the ratio of oil to paper reaches 10:1. Then, vacuumize the sample in a nitrogen operating box and then fill it with nitrogen to a standard atmospheric pressure to seal; put the sealed flask into an aging box at 110°C for accelerated thermal aging (the measured initial moisture c...
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Abstract
The invention relates to a method for assessing a transformer oilpaper insulation aging state through a depolarized electricity increase rate and belongs to the field of oilpaper insulation aging state assessment technology. The method comprises the steps that S1, oilpaper insulation samples of different aging states are prepared; S2, polymerization degree measurement is regularly performed on theoilpaper insulation samples; S3, a polarized / depolarized current test is performed on the oilpaper insulation samples, and the depolarized electricity increase rate of the oilpaper insulation samplesis analyzed and calculated; and S4, the depolarized electricity increase rate of the oilpaper insulation samples is fitted with the corresponding polymerization degree, and stages of the aging stateof the oilpaper insulation samples are divided. Through the method, the corresponding relation between depolarized electricity increase rates and oilpaper insulation polymerization degree intervals isobtained, so that it is more convenient to assess the transformer oilpaper insulation aging state in engineering practice.
Description
technical field [0001] The invention belongs to the technical field of evaluating the aging state of oil-paper insulation, and relates to a method for evaluating the aging state of transformer oil-paper insulation by using the growth rate of depolarized electricity. Background technique [0002] Transformer is the most important equipment among all kinds of high-voltage electrical equipment, and it is also the core equipment of substation. Its operation status is directly related to the safe operation of power system. Because the cost of power transformer itself is very expensive, the losses caused by power transformer accidents are often huge. According to statistics, the faults caused by the deterioration of the transformer's internal insulation account for more than half of the total number of transformer faults. Therefore, it is of great significance to the safe and stable operation of the power grid to evaluate the insulation aging state of transformers by using modern...
Claims
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IPC IPC(8): G01R31/12
CPCG01R31/1263
Inventor 郝建廖瑞金杨丽君但敏邹润豪冯大伟廖强赵学童成立李剑
Owner CHONGQING UNIV