On-line Monitoring Method for Transformer Bushings with Moisture Based on Air Humidity Perception in Conservator

被引：0

作者：

Jia L. ^{[1
]}

Wang T. ^{[1
]}

Xiao W. ^{[1
]}

Shu S. ^{[2
]}

Li W. ^{[2
]}

Zheng Y. ^{[2
]}

机构：

[1] Power Grid Technology Research Center of China Southern Power Grid Co., Ltd., Guangzhou

[2] College of Electrical Engineering and Automation, Fuzhou University, Fuzhou

来源：

Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 09期

关键词：

Air humidity; Moisture; On-line monitoring; Perception; Transformer bushings;

D O I：

10.13336/j.1003-6520.hve.20201019

中图分类号：

学科分类号：

摘要：

Moisture penetration is one of the main reasons for failure of transformer bushings, so an on-line monitoring method for transformer bushings with moisture based on air humidity perception in conservator is proposed in this paper. Firstly, implementation principles and key issues were expounded. Then, a simulator of a transformer bushing with moisture was designed and made. Finally, the migration characteristics of water between oil and air, the influence rule of the interface radius on response characteristics of monitoring device, and the sensitivity and error characteristics of humidity indicator cards, were studied experimentally. The experimental results show that the monitoring device can response rapidly once liquid water enters into the bushing and touches with the air, however, the water balance between damp transformer oil and dry air takes 60~80 hours. The larger the interface radius, the shorter the response time of monitoring device, and the absolute humidity in the monitoring device rises the most quickly when the interface radius is 6 mm. The indication error of humidity indicator cards increases with the temperature. Finally, an adjustment method for the humidity indicator card by considering the influence of temperature has been proposed to realize the color changing alarm for moisture in the transformer bushing under different operation temperatures. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：3114 / 3123

页数：9

共 24 条

[1]

MA Guoming, ZHOU Hongyang, LIU Yunpeng, Et al., Optical fiber ultrasonic detection technology for partial discharge in power transformer and new multiplexing method, High Voltage Engineering, 46, 5, pp. 1768-1780, (2020)

[2]

CHEN Bin, LIU Ge, Research progress in on-line monitoring methods of micro-water content in transformer oil, High Voltage Engineering, 46, 4, pp. 1405-1416, (2020)

[3]

MU Haibao, ZHAO Haoxiang, ZHANG Daning, Et al., Study on multi-parameter intelligent sensing technology for transformer oil-paper bushing, High Voltage Engineering, 46, 6, pp. 1903-1912, (2020)

[4]

LIANG Ningchuan, LIAO Ruijin, YUAN Yuan, Et al., Effect and mechanism of amine compounds on insulating oil during thermal aging of oil-paper insulation, High Voltage Engineering, 46, 2, pp. 666-672, (2020)

[5]

LUNDGAARD L E, HANSEN W, LINHJELL D, Et al., Aging of oil-impregnated paper in power transformers, IEEE Transactions on Power Delivery, 19, 1, pp. 230-239, (2004)

[6]

SHARMA P, LAO L, FALCONE G., A microwave cavity resonator sensor for water-in-oil measurements, Sensors & Actuators: B. Chemical, 262, 1, pp. 200-210, (2018)

[7]

ZARKOVIC M, STOJKOVIC Z., Analysis of artificial intelligence expert systems for power transformer condition monitoring and diagnostics, Electric Power Systems Research, 149, pp. 125-136, (2017)

[8]

ZHANG Tao, XIAO Xia, LI Yasha, Et al., Molecular dynamics simulation of insulating oil under the interaction of water and acid, Journal of Atomic and Molecular Physics, 36, 1, pp. 17-22, (2019)

[9]

ZHENG Yuesheng, REN Jianhua, SHU Shengwen, Et al., Effect of air humidity on breakdown characteristics of short gaps under alternating non-uniform electric fields, High Voltage Engineering, 45, 5, pp. 1352-1359, (2019)

[10]

SAHA T K, PURKAIT P., Investigation of polarization and depolarization current measurements for the assessment of oil-paper insulation of aged transformers, IEEE Transactions on Dielectrics and Electrical Insulation, 11, 1, pp. 144-154, (2004)

← 1 2 3 →