Nondestructive evaluation of insulation condition of transformer bushings based on degree of polymerization of oil-paper

doi:10.11949/j.issn.0438-1157.20160240

CIESC Journal ›› 2016, Vol. 67 ›› Issue (S1): 366-371.DOI: 10.11949/j.issn.0438-1157.20160240

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Nondestructive evaluation of insulation condition of transformer bushings based on degree of polymerization of oil-paper

SUN Changhai¹, LI Weijiang¹, WANG Ming¹, CHEN Baitong¹, WU Yan¹, ZHONG Juntao², XUE Jingmei², PENG Na², WEN Zheng²

1 School of Electrical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;
2 Shenyang Transformer Corporation of TBEA, Shenyang 110144, Liaoning, China

Received:2016-03-02 Revised:2016-03-20 Online:2016-08-31 Published:2016-08-31
Supported by:
supported by the Special Major Science and Technology Innovation in Liaoning Province (2015080003-201).

基于绝缘纸聚合度变压器套管绝缘状态无损评估方法

孙长海¹, 李维江¹, 王明¹, 陈百通¹, 吴彦¹, 钟俊涛², 薛静梅², 彭娜², 闻政²

1 大连理工大学电气工程学院, 辽宁大连 116024;
2 电工沈阳变压器集团有限公司, 辽宁沈阳 110144

通讯作者: 孙长海,duttd@dlut.edu.cn
基金资助:
辽宁省科技创新重大专项（2015080003-201）。

Abstract

Abstract:

The paper is to study the relationship between degree of polymerization (DP) of oil-paper and frequency domain dielectric spectroscopy (FDS) in the insulation assessment of oil-paper condenser bushings. To achieve the result, a sample of oil-paper condenser bushings was designed and tested in aging. Through the measurement of DP and FDS of different aged samples and the study of relationship between DP and frequency domain curve of capacitance (C)and dielectric loss factor (tan δ),a new method of insulation assessment of oil-paper condenser bushings was invented. The results show that:(1) the capacitance frequency domain dielectric characteristic quantity of the oil-paper insulation sample in 10^-3-1 Hz can reflect the aging status of bushing;(2) There is a secondary polynomial function between DP and frequency domain curve of C;(3) The dielectric loss factor reflects the aging status of bushing only in the 1 Hz.

Key words: degree of polymerization, frequency domain dielectric spectroscopy, oil-paper insulation, insulation condition assessment

摘要：

研究套管绝缘纸聚合度与频域介电响应规律，提出基于绝缘纸聚合度油纸电容式高压套管绝缘状态无损评估方法。设计了油纸电容式高压套管作为被试品，开展老化试验模拟套管服役状态。获得一系列不同老化周期的套管，测试其绝缘纸聚合度和频域介电谱曲线。通过对被试套管的老化时间以及聚合度与电容量（C）、介质损耗因数（tan δ）的频域谱曲线的关系的研究，提出了一种油纸电容式高压套管绝缘状态评估的新方法，即基于绝缘纸聚合度油纸电容式高压套管绝缘状态无损评估方法。研究结果表明：（1）套管的电容量频域谱曲线在10^-3～1 Hz的频域段内能够明显随其绝缘纸聚合度的变化而变化；（2）聚合度倒数差与电容量的频域谱曲线的积分存在二次函数多项式关系；（3）在1 Hz左右频率下的介质损耗因数能够更好地反映其老化状态。

关键词: 聚合度, 频域介电谱, 油纸电容式套管, 绝缘状态评估

CLC Number:

O631.3⁺3

SUN Changhai, LI Weijiang, WANG Ming, CHEN Baitong, WU Yan, ZHONG Juntao, XUE Jingmei, PENG Na, WEN Zheng. Nondestructive evaluation of insulation condition of transformer bushings based on degree of polymerization of oil-paper[J]. CIESC Journal, 2016, 67(S1): 366-371.

孙长海, 李维江, 王明, 陈百通, 吴彦, 钟俊涛, 薛静梅, 彭娜, 闻政. 基于绝缘纸聚合度变压器套管绝缘状态无损评估方法[J]. 化工学报, 2016, 67(S1): 366-371.

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Nondestructive evaluation of insulation condition of transformer bushings based on degree of polymerization of oil-paper

基于绝缘纸聚合度变压器套管绝缘状态无损评估方法

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