Evaluation Method for Moisture Content and Aging Degree of Transformer Oil-paper Insulation Based on Frequency Dielectric Spectroscopy and Compensation Factor

被引：0

作者：

Wu G. ^{[1
]}

Xia G. ^{[1
,2
]}

Su M. ^{[1
]}

Zhu H. ^{[1
]}

Yang F. ^{[1
]}

Gao B. ^{[1
]}

机构：

[1] School of Electrical Engineering, Southwest Jiaotong University, Chengdu

[2] Nanjing Nanrui Jibao Electric Co., Ltd., Nanjing

来源：

Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 03期

关键词：

Aging state; Compensation factor; FDS; Feature quantity; Moisture content; Oil-paper insulation;

D O I：

10.13336/j.1003-6520.hve.20190226003

中图分类号：

学科分类号：

摘要：

In order to distinguish the influence of aging state and moisture on frequency domain spectroscopy (FDS) and improve accuracy of assessing aging state and moisture content of oil-paper insulation, we put forward an evaluation method based on frequency domain dielectric spectroscopy and compensation factor. In the proposed method the frequency domain dielectric spectroscopy method was firstly used to test sets of oil-paper insulation samples which were prepared in the laboratory with different degree of aging and water content. Then, based on the measured spectrum curves, the feature quantities of aging degree and moisture content were proposed, and the aging factor and moistore compensate factor were first introduced to compensate the influences of them respectively. Finally, a new method was proposed to evaluate the condition of oil-paper based on compensation factor, and field tests were carried out to verify the validity. The experimental results show that the FDS at the low frequency range (10-3~10-1 Hz) is affected by both water and aging; at the high frequency range (101~103 Hz) the FDS is mainly affected by moisture when the moisture content is on a low level; however, when the moisture content reaches a high level, the effect of aging degree on this band will become obvious. Sm and SDP are extracted as characteristic parameters of moisture content and aging degree, respectively, and compensation factors can reflect and eliminate the effects of aging or moisture in the feature. By employing this method to evaluate the moisture content and polymerization degree of active transformers, the results are similar to the measured values, and the effectiveness of the method is preliminarily verified. Therefore, the proposed method which is based on the compensation factor algorithm can provide an effective way for the status assessment of actual transformer. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：691 / 700

页数：9

共 22 条

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