Difference Analysis of High-voltage Frequency Domain Dielectric and Partial Discharge Characteristics of Oil-paper Insulation Bushings with Typical Defections

被引：0
作者：
Jian Z. [1 ]
Hao J. [1 ]
Liu Q. [1 ]
Liao R. [1 ]
Shang Y. [2 ]
Liu Q. [1 ]
机构：
[1] State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing
[2] Electric Power Research Institute of State Grid Shaanxi Electric Power Company, Xi’an
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 10期
基金：
中国国家自然科学基金;
关键词：
difference analysis; high-voltage frequency domain dielectric; oil-paper insulation bushing; partial discharge; typical defect;
D O I：
10.13336/j.1003-6520.hve.20211427
中图分类号：
学科分类号：
摘要：
The insulation defect of oil-paper insulation bushings is an important cause of faults in oil-immersed transformers. In order to study the insulation characteristics of typical defective bushings, oil-paper insulation bushings with structural defects (capacitor screen process defect, suspended dicsharge insulation defect on lower porcelain) and integral defects (whole core dampened) were designed and manufactured. The high-voltage frequency domain dielectric and partial discharge characteristics test and difference analysis of typical defective bushings were carried out. The results show that the differences in high-voltage frequency domain dielectric properties of the bushing with capacitor screen process defects and the bushing with suspended dicsharge insulation defects on lower porcelain are negligible compared to the normal bushing, showing the influence of Garton effect; meanwhile, their partial discharge characteristic quantities show a significant increase trend with the increase of voltage. The frequency domain dielectric characteristic quantity of the bushing with whole core dampened is significantly larger than that of the normal bushing, whereas its partial discharge characteristic quantity shows a weaker voltage correlation with the increase of voltage. High voltage frequency domain dielectric characteristics are very sensitive to moisture, whereas it is difficult to reflect structural defects. The partial discharge analysis can effectively identify the defect type of the bushing with structural defects, and the combination of the two methods can provide a valuable reference for diagnosing the insulation defect of bushing. © 2022 Science Press. All rights reserved.
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页码：4113 / 4123
页数：10
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