Research on UHF Partial Discharge Detection Method Based on Grounding Current of Transformer Core

CAI Linglong; MA Zhiqin; LIAO Zihao; ZHOU Dan; SUN Wenxing; LI Zhongxiang; XIAO Yongjian

doi:10.13296/j.1001-1609.hva.2025.10.006

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Research on UHF Partial Discharge Detection Method Based on Grounding Current of Transformer Core

Panoramic State Intelligent Perception Technology for Power Equipment | 更新时间：2025-10-21

- Research on UHF Partial Discharge Detection Method Based on Grounding Current of Transformer Core
- High Voltage Apparatus Vol. 61, Issue 10, Pages: 45-54(2025)
- 作者机构：
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- DOI：10.13296/j.1001-1609.hva.2025.10.006
  CLC：
- Received：01 April 2025，
  
  Revised：2025-07-08，
  
  Published：16 October 2025
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CAI Linglong, MA Zhiqin, LIAO Zihao, et al. Research on UHF Partial Discharge Detection Method Based on Grounding Current of Transformer Core[J]. High voltage apparatus, 2025, 61(10): 45-54.
DOI：

CAI Linglong, MA Zhiqin, LIAO Zihao, et al. Research on UHF Partial Discharge Detection Method Based on Grounding Current of Transformer Core[J]. High voltage apparatus, 2025, 61(10): 45-54. DOI： 10.13296/j.1001-1609.hva.2025.10.006.

摘要

局部放电作为绝缘劣化的显著特征，是诊断变压器绝缘状况的重要依据。现有宽频脉冲电流检测易受到外界环境电磁干扰，特高频检测虽然具有良好的抗干扰性能，但其传感器的安装需与变压器结构相匹配而应用受限。文中提出基于变压器铁心接地电流的特高频局部放电检测方法，基于时域有限差分法建立变压器特高频仿真模型，仿真研究铁心对于特高频信号的接收性能，利用实体110 kV变压器进行局部放电实验，验证了该检测方法的可行性和有效性。结果表明，三相三柱式变压器中的铁心在367～533 MHz、1.29～1.36 GHz、2.06～2.44 GHz频域范围可作为特高频传感器进行局部放电检测；基于铁心接地电流的特高频局部放电检测方法与常规脉冲电流和特高频检测具有一致性，可以通过特高频信号幅值表征放电强弱。

Abstract

Partial discharge (PD)

as a significant indicator of insulation deterioration

is an important basis for diagnosing the insulation condition of transformers. The existing wideband pulse current detection methods are susceptible to electromagnetic interference from the external environment. Although the ultra-high frequency (UHF) detection offers good immunity to such interferences

yet the installation of UHF sensors is limited due to the requirement for compatibility with transformer structures. In this study

a UHF PD detection method based on the grounding current of the transformer core is proposed. A UHF simulation model of the transformer is set up using finite difference time domain (FDTD) method

enabling the investigation of the receiving performance of the core for UHF signals by simulation study. Partial discharge experiments are performed using a physical 110 kV power transformer to verify the feasibility and effectiveness of the detection method. The results demonstrate that the The core of a three-phase three-winding transformer can serve as a UHF sensor for PD detection within the frequency ranges of 367-533 MHz

1.29-1.36 GHz

and 2.06-2.44 GHz. The UHF PD detection method based on the grounding current of the core exhibits consistency with conventional pulse current and UHF detection methods

allowing the characterization of discharge intensity based on the amplitude of UHF signals.

关键词

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references

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