基于时频域介电响应混合的绝缘诊断装置
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TM855

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国家自然科学基金委员会-中国物理工程研究院联合基金资助项目(U1830129)

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    摘要:

    油纸绝缘电力设备绝缘状态的准确诊断与评估对于电力系统的安全稳定运行具有重要的意义。频域介电谱(FDS)法具有包含绝缘信息丰富、抗干扰能力强等优点,但其低频段测试过程需要耗费大量时间,为现场测试与诊断评估带来困难。此外,由于低频段电流幅值较低,极容易受到外界干扰导致测试误差。为了解决低频FDS法测试时间长及精度差的问题,文中采用时域法和频域法混合求解方式,在低频段,运用傅里叶变换将时域极化电流信号变换到频域,从而得到低频段的损耗因数。为解决低频段FDS法及极化与去极化电流(PDC)法电流测量误差大的问题,文中设计了一套基于时频域介电响应混合的绝缘诊断装置,其中线性级联放大器具有高带宽、高电压、低谐波畸变率的优点;微电流测量电路采用对称差分结构,可有效抑制温度和工频干扰的影响。最后,通过对变压器油纸绝缘套管模型进行实验测试,验证了该装置测量的准确性。

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The insulation diagnosis device based on the hybrid time and frequency domain method
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Supported by NSAF(U1830129)

    Abstract:

    It is significant for the safe and stable operation of power system to accurately diagnose and evaluate the insulation status of oil-paper-insulated power equipment. Frequency-domain dielectric spectroscopy has the advantages of abundant insulation information and strong anti-interference ability. However,it takes a lot of time for low-frequency test process of frequency domain spectroscopy (FDS),which has a negative influence on field testing,diagnostic and evaluation. In addition,the FDS curve is very vulnerable to external interference and result in test error due to the low current amplitude in the low frequency band. In order to solve this problem,a mixed solution of time domain method and frequency domain method is adopted. In the low frequency band,the Fourier Transform is used to transform the time domain polarized current signal into the frequency domain to obtain the loss factor of the low frequency band. Meanwhile,a set of insulation diagnosis devices is designed in this paper based on hybrid time and frequency domain method. The linear cascade amplifier has the advantages of high bandwidth,high voltage and low harmonic distortion. A symmetric differential structure is adopted in the micro current measurement circuit,which suppress temperature and power frequency interference effectively. Finally,the accuracy of the device is verified by the experimental test on the oil-paper insulation bushing model of the transformer.

引用本文

汪亮,云浩,李洋,高轩,马回明,张大宁.基于时频域介电响应混合的绝缘诊断装置[J].电力工程技术,2021,40(5):184-191

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  • 收稿日期:2021-03-19
  • 最后修改日期:2021-05-26
  • 录用日期:2020-06-18
  • 在线发布日期: 2021-09-30
  • 出版日期: 2021-09-28