Low-Frequency Oscillation Suppression of FDR Time-Domain Diagnostic Waveforms for Cable Defects Based on Splicing Technology

Jingtao Huang; Kai Zhou; Yefei Xu; Zhirong Tang; Zuoxin Tang; Zhongying Liang; Xianjie Rao

doi:10.1049/hve2.70143

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Low-Frequency Oscillation Suppression of FDR Time-Domain Diagnostic Waveforms for Cable Defects Based on Splicing Technology

更新时间：2026-07-03

- Low-Frequency Oscillation Suppression of FDR Time-Domain Diagnostic Waveforms for Cable Defects Based on Splicing Technology
- High Voltage Vol. 11, Issue 3, (2026)
- 作者机构：
  
  1. Sichuan University, The College of Electrical Engineering,Chengdu,China
  2. Northwest Minzu University, The College of Electrical Engineering,Lanzhou,China
  3. Yunnan Electric Power Design Institute Co. Ltd, China Energy Engineering Group,Kunming,China
  4. State Grid Chengdu Power Supply Company,Chengdu,China
- 作者简介：
- 基金信息：
- DOI：10.1049/hve2.70143
  CLC：
- Published：2026
- 稿件说明：
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Jingtao Huang, Kai Zhou, Yefei Xu, et al. Low-Frequency Oscillation Suppression of FDR Time-Domain Diagnostic Waveforms for Cable Defects Based on Splicing Technology[J]. High Voltage, 2026, 11(3).
DOI：

Jingtao Huang, Kai Zhou, Yefei Xu, et al. Low-Frequency Oscillation Suppression of FDR Time-Domain Diagnostic Waveforms for Cable Defects Based on Splicing Technology[J]. High Voltage, 2026, 11(3). DOI： 10.1049/hve2.70143.

摘要

Abstract

A time domain pulse (TDP) based on the frequency domain reflectometry (FDR) method can be used to diagnose the insulation state of cable defects. However

because of the limitations of the FDR test instrument

the lack of a reflection coefficient spectrum (RCS) in the low-frequency band (LFB) can result in low frequency oscillation in the time domain reflection signal

which may shield the TDP characteristics of cable defects and then affect the diagnosis of the insulation state of the local defect. To improve the diagnostic performance of the insulation status of local defects in power cables

a low-frequency stitching technology based on time domain reflectometry (TDR) and FDR is proposed in this work. First

the influence of the RCS in the LFB on the TDP characteristic is analysed through different lower frequency limits. Then

the principles of the proposed low-frequency stitching technology are introduced in detail

including headend impedance mismatch compensation and the low frequency stitching algorithm. Finally

through simulation and an actual test of two power cables

the effectiveness of the proposed method is verified. The experimental results showed that using the low frequency stitching method could effectively obtain the RCS in the LFB

suppress low-frequency oscillations in the time domain reflection signal and further enhance the TDP characteristics of the cable defects. Thus

the diagnostic performance of the insulation state of the defect could be improved.

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