油浸式高压套管局部放电非接触式特高频检测
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TM854

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江苏省自然科学基金资助项目(BK20170786)


Non-contact partial discharge detection of high voltage oil-impregnated-paper bushing based on UHF technology
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    摘要:

    变压器套管是承担引出线与变压器箱体绝缘的重要支撑装置,现有变压器套管潜伏性放电故障检测技术及时性差且灵敏度较低,而特高频技术抗干扰能力强且可实现非接触式检测。文中提出一种基于特高频检测技术的套管局放检测方法,建立35 kV套管的局放仿真模型并开展真型套管不同类型缺陷的局放试验。所得结论为:电容屏间油纸和外侧油道都是特高频电磁波传播的有效路径;传播过程中横电波(TM波)从-16 dB大幅衰减至-5 dB,横磁波(TE波)初始成分不足1%,主要成分为横电磁波(TEM波);特高频段能量主要集中在0.3~1.5 GHz。通过设置无接触特高频传感器即可实现套管的带电检测,确保电力变压器运行安全可靠。

    Abstract:

    Existing detection techniques for partial discharge based on transformer bushings have low sensitivity and cannot detect timely, while ultra-high frequency(UHF) technology has high anti-interference ability and can achieve contactless detection. UHF detection technology for bushing partial discharge detection method is proposed. A 35 kV bushing partial discharge simulation model is established and a partial discharge test is performed for different types of defects. The conclusions include that both oil-impregnated paper amid the capacitances and the oil channel are effective paths for UHF electromagnetic wave propagation. Transverse magnetic wave(TM) is greatly attenuated during the propagation process(from -16 dB to -5 dB). The initial component of the transverse electric wave(TE) is less than 1% and the main component is the transverse electromagnetic wave(TEM). The main energy in the UHF band concentrates in the lower frequency domain, and the partial discharge of different defect types of the bushing corresponds to different characteristic spectra. The contactless UHF sensor of the bushing can realize the live detection of the bushing, thereby ensuring the safety and reliability of the power transformer operation.

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陈钜栋,江军,杨小平,李建生,张潮海.油浸式高压套管局部放电非接触式特高频检测[J].电力工程技术,2021,40(1):147-154

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历史
  • 收稿日期:2020-07-09
  • 最后修改日期:2020-08-24
  • 录用日期:2020-03-30
  • 在线发布日期: 2021-02-03
  • 出版日期: 2021-01-28