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ISSN:2394-3661 | Crossref DOI | SJIF: 5.138 | PIF: 3.854

International Journal of Engineering and Applied Sciences

(An ISO 9001:2008 Certified Online and Print Journal)

Development rule of temperature on oil-paper-insulated pin plate discharge under long-term operation Research

( Volume 7 issue 3,March 2020 ) OPEN ACCESS
Author(s):

Zhao Zhong, Lu Xue

Keywords:

Heat aging, High and low temperature contrast, Heat aging, Needle plate discharge, Real and Simulation Oil paper insulation

Abstract:

In order to study the effect of temperature on the partial discharge of the oil-paper-insulated pin plate under long-term operation of the main transformer, we chose a vacuum heat aging 32-day simulation sample and a 28-year actual operation sample. And the step-up pressure method was used to test the local pressure of the needle plate of the two samples at ordinary temperature (30℃, 50℃) and high temperature (85℃ signal point, 105℃ trip point), and the relevant discharge characteristic quantity was analyzed by the partial discharge inspection instrument record.The results show:There is no significant difference between the heat-aged oil paper sample and the field sample in the early stage of discharge.However, there is a large difference in the development to the middle and late stages under the high temperature, especially the 105℃ trip point; The maximum discharge and total discharge at ordinary temperature near the breakdown time are both small, which is 2/3 of that at high temperature. The number of discharges gradually increased with the increase of compression time. The actual phase width and density of the actual samples at 105℃ during the middle and late periods of discharge were higher than those of the simulated aging samples. That is to say, the influence of high temperature on the oil-paper insulation of the main transformer during long-term operation is greater than that at low temperature. The oil-paper insulation level actually collected at the site increases with the extension of the operating time. It is easier to enter a dangerous period than a laboratory simulation sample at high temperatures, and the consequences of partial discharge are more serious.

DOI DOI :

https://dx.doi.org/10.31873/IJEAS.7.03.08

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