多频正弦电压激励的快速频域介质响应测试及波形参数优化方法

doi:10.19595/j.cnki.1000-6753.tces.160875

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摘要

介质响应测试技术作为一种无损测试方法,被广泛应用于电介质绝缘材料的绝缘性能参数测量及状态评估中。传统的频域介质响应测试采用标准正弦波电压作为激励,以扫频方式完成高频到低频范围内的测试。该方法的主要缺点是在低频段进行测试时需要耗费大量时间,极大地限制了其在现场的应用。该文以多频正弦波代替传统的标准正弦波作为电压激励,研究该激励波形参数的优化方法,通过傅里叶分析,对多频正弦激励下的单频分量进行分离,进而计算得到各谐波频率下油纸绝缘的复电容、介质损耗等参数,在保证测试精度的前提下实现缩短频域介电谱测试时间的目的。基于该方法,采用自制的测试硬件及分析系统,对油浸绝缘纸板以及高压试验变压器在0.1 mHz~1 kHz范围内进行频域介电谱测试,并与Megger公司的IDAX-300测试结果进行对比。结果表明：两种方法测试结果能够很好地吻合,相对误差不超过1%;采用优化后的多频正弦激励测试方法仅耗时2.9 h,相比于采用扫频方式的IDAX-300,相同测试条件下节省测试时间8 h。

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	杨丽君
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	陈俊儒

关键词 ：频域介质谱, 多频正弦, 波形优化, 油纸绝缘

Abstract：

Dielectric response measurement technology is widely used in dielectric materials for dielectric property measurement and condition assessment as a non-destructive testing method. Pure sinusoidal waveform was adopted as excitation voltage in traditional frequency domain spectroscopy (FDS) measurement. The measurement results at different frequency are obtained by sweep frequency method from high-frequency to low-frequency. A major shortcoming of this method is time-consuming in low-frequency, which limits its application in the field. This paper used multisine waveform instead of natural sinusoid as excitation and studied the optimization methods of multisine waveform parameters. The harmonic components of multisine excitation and response current were extracted using Fast Fourier Transform, complex capacitance and dielectric dissipation factor were calculated simultaneously for each of these harmonic components. The purpose of accelerating FDS measurement was realized base on assurance of measurement accuracy. Three different oil-immersed pressboards and a high voltage testing transformer were measured in 0.1 mHz~1 kHz using self-made measurement hardware and analysis system. The results were compared with commercial instrument IDAX-300. According to the experimental results, the results of the two methods are in good agreement and the relative error is not more than 1%. The measurement time under optimized multisine excitation is only 2.9 h. Compared with conventional single frequency sweep, the proposed method saves 8 h.

Key words： Frequency domain dielectric spectroscopy multisine waveform optimization oil-paper insulation

收稿日期: 2016-06-08 出版日期: 2018-01-16

PACS:

TM930

基金资助:

国家创新研究群体基金（51321063）和国家自然科学基金（51277187）资助项目

作者简介: 杨丽君女,1980年生,博士,教授,博士生导师,研究方向为电气设备绝缘在线监测与故障诊断。E-mail：yljcqu@cqu.edu.cn;王松华男,1991年生,硕士研究生,研究方向为电气设备绝缘在线监测与故障诊断。E-mail：121220006@qq.com（通信作者）

引用本文:

杨丽君, 王松华, 郑含博, 付刚, 陈俊儒. 多频正弦电压激励的快速频域介质响应测试及波形参数优化方法[J]. 电工技术学报, 2018, 33(1): 175-184. Yang Lijun, Wang Songhua, Zheng Hanbo, Fu Gang, Chen Junru. A Fast Frequency Domain Dielectric Spectroscopy Method under Multisine Voltage Excitation and Waveform Parameters Optimization. Transactions of China Electrotechnical Society, 2018, 33(1): 175-184.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.160875 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I1/175

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