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学者姓名：陈俊鸿
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Abstract ：
C4F7N/CO2 mixture is one of the most promising environmentally friendly alternatives to SF6 gas. However, the research on the development characteristics of surface discharge for C4F7N/CO2 mixture is still insufficient. In this study, the surface streamer propagation pattern in 0.1 MPa 10%C4F7N/90%CO2 mixture under impulse voltage with a needle-plate electrode configuration is investigated. From the discharge morphology, it can be observed that surface discharge exhibits a distinct stepwise expansion pattern. The first-step streamer develops outward from the needle tip and appears in a circular shape. Subsequent streamers grow out from the head of the previous streamer and extend outward in a fan-shaped pattern. Compared to positive polarity, surface streamers are more difficult to develop under negative polarity voltage. This is due to the more significant corona stabilization effect observed in negative polarity streamer discharges. Each stepwise expansion of surface streamers corresponds to a streamer-to-leader transition. The surface streamers transition to leaders through the precursor mechanism. Only when the electric field at the head of the streamer reaches the critical electric field, the streamer-to-leader transition can be triggered, resulting in the stepwise expansion pattern. In this study, the threshold potential at the head of the streamer for the transition from primary streamer to primary leader is approximately +5.44 kV for positive polarity and -7.78 kV for negative polarity. Due to the lack of relevant parameters, it is not possible to calculate the critical electric field at the head of the primary streamer in this study.
Keyword ：
C4F7N/CO2 mixture C4F7N/CO2 mixture precursor leader precursor leader stepwise expansion stepwise expansion surface streamer discharge surface streamer discharge
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| GB/T 7714 | Chen, Junhong , Deng, Junbo , Sun, Peng et al. Stepwise Expansion Pattern of Surface Streamer Propagation in C4F7N/CO2 Mixture Under Impulse Voltage [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2025 , 53 (7) : 1604-1610 . |
| MLA | Chen, Junhong et al. "Stepwise Expansion Pattern of Surface Streamer Propagation in C4F7N/CO2 Mixture Under Impulse Voltage" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 53 . 7 (2025) : 1604-1610 . |
| APA | Chen, Junhong , Deng, Junbo , Sun, Peng , Yin, Wei , Liu, Jianben , Liu, Yan . Stepwise Expansion Pattern of Surface Streamer Propagation in C4F7N/CO2 Mixture Under Impulse Voltage . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2025 , 53 (7) , 1604-1610 . |
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Abstract ：
为了深入研究油纸绝缘变压器老化特性与绝缘介质弛豫响应机理之间的关系,辨识出准确有效的等效电路参数尤其重要.针对现阶段等效电路参数辨识研究中存在的诸多问题,结合矩阵束算法提出一种扩展德拜模型等效电路参数唯一辨识的新方法.首先,根据极化去极化电流法的数据构建汉克尔矩阵并对其进行奇异值分解,再根据奇异值曲线中奇异值大小区分理想信号与噪声信号,得到极化支路数;然后通过内积的数学计算拟合得到去极化电流的各弛豫系数和弛豫时间常数进而实现参数辨识;最后利用仿真和实测数据进行验证,结果证明矩阵束算法能有效拟合含有较大噪声的去极化电流.该方法可为油纸绝缘内部介质弛豫响应研究提供可靠的数学分析模型.
Keyword ：
去极化电流 去极化电流 参数辨识 参数辨识 扩展德拜模型 扩展德拜模型 油纸绝缘 油纸绝缘 矩阵束算法 矩阵束算法
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| GB/T 7714 | 陈俊鸿 , 刘庆珍 , 高浩 . 基于矩阵束算法的油纸绝缘变压器去极化电流等效电路参数辨识 [J]. | 广东电力 , 2021 , 34 (1) : 89-96 . |
| MLA | 陈俊鸿 et al. "基于矩阵束算法的油纸绝缘变压器去极化电流等效电路参数辨识" . | 广东电力 34 . 1 (2021) : 89-96 . |
| APA | 陈俊鸿 , 刘庆珍 , 高浩 . 基于矩阵束算法的油纸绝缘变压器去极化电流等效电路参数辨识 . | 广东电力 , 2021 , 34 (1) , 89-96 . |
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