Micro Partial Discharge Characteristics of SF6 Under DC Voltage

Geng Chen; Jie Wang; Chuanyang Li; Cong Wang; Youping Tu

doi:10.1049/hve2.70132

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Micro Partial Discharge Characteristics of SF6 Under DC Voltage

更新时间：2026-10-08

- Micro Partial Discharge Characteristics of SF6 Under DC Voltage
- High Voltage Vol. 11, Issue 4, (2026)
- 作者机构：
  
  1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University,Beijing,China
  2. ,and
  3. Youping Tu
  4. State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University,Beijing,China
  5. Geng Chen
- 作者简介：
- 基金信息：
- DOI：10.1049/hve2.70132
  CLC：
- Published：2026
- 稿件说明：
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Geng Chen, Jie Wang, Chuanyang Li, et al. Micro Partial Discharge Characteristics of SF6 Under DC Voltage[J]. High Voltage, 2026, 11(4).
DOI：

Geng Chen, Jie Wang, Chuanyang Li, et al. Micro Partial Discharge Characteristics of SF6 Under DC Voltage[J]. High Voltage, 2026, 11(4). DOI： 10.1049/hve2.70132.

摘要

In gas-insulated high-voltage direct current (HVDC) devices

micro partial discharges (PD) caused by micro-protrusions or surface roughness on conductors or enclosures may not cause immediate insulation system failure due to their weak discharge intensity. However

the continuous charging of carriers generated by the discharges to the insulator is one of the potential triggers of surface flashover of insulators. This work investigates the micro PD characteristics in SF6 at 0.1–0.7 MPa

which is below the lower limit of conventional detection methods

via a highly sensitive micro-discharge measurement platform. The experimental results show that the micro PD exhibits a strong polarity effect. With increasing pressure

the mean amplitude and mean repetition rates exhibited an extremum at 0.3 MPa. As the applied voltage increased

the mean amplitude shifted from negative polarity dominance over positive polarity to positive polarity dominance over negative polarity. Time-resolved PD (TRPD) and pulse sequence analysis (PSA) patterns indicate that the micro PD is characterised by clustered bursts and amplitude stratification. Furthermore

the negative polarity micro PD is more stable than the positive polarity counterpart. The results of this work can provide references to guide the optimized design of gas-insulated HVDC devices.

Abstract

In gas-insulated high-voltage direct current (HVDC) devices

which is below the lower limit of conventional detection methods

via a highly sensitive micro-discharge measurement platform. The experimental results show that the micro PD exhibits a strong polarity effect. With increasing pressure

the mean amplitude and mean repetition rates exhibited an extremum at 0.3 MPa. As the applied voltage increased

the negative polarity micro PD is more stable than the positive polarity counterpart. The results of this work can provide references to guide the optimized design of gas-insulated HVDC devices.

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