乙丙橡胶电缆终端气隙局部放电过程及特征提取

郭蕾; 曹伟东; 白龙雷; 邢立勐; 项恩新; 周利军

doi:10.3969/j.issn.0258-2724.20200157

乙丙橡胶电缆终端气隙局部放电过程及特征提取

doi: 10.3969/j.issn.0258-2724.20200157

基金项目: 四川省科技计划青年科技创新研究团队项目（2020JDTD0009）

详细信息

作者简介:
郭蕾（1981—），女，副教授，博士，研究方向为牵引供电系统建模和电能质量分析，E-mail：guolei_mail@swjtu.cn

通讯作者:
周利军（1978—），男，教授，博士，研究方向为电气设备状态检测与故障诊断，E-mail：zhoulijun@swjtu.cn

中图分类号: TM852
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-04
- 修回日期: 2020-08-13
- 网络出版日期: 2020-10-09
- 刊出日期: 2021-10-15

Partial Discharge Process and Feature Extraction of Air Gap in EPR Cable Terminal

摘要

摘要: 高速列车乙丙橡胶（ethylene propylene rubber，EPR）电缆终端由于制作、安装不规范，导致终端内部出现气隙，气隙部位的局部放电将严重影响高速列车的正常运行. 为了分析气隙缺陷下25 kV乙丙橡胶电缆的局部放电过程及特性，制作了含气隙缺陷的电缆试样，测量了试样自起始放电至击穿全过程的放电参量及局部放电相位（phase resolved partial discharge，PRPD）谱图发展过程，并基于Gaussian金字塔与灰度共生矩阵的方法对放电全过程的PRPD谱图进行了特征提取. 研究表明：根据放电参量的变化规律，可将整个放电过程分为放电发展阶段、放电持续阶段、临近击穿阶段；基于各阶段的PRPD谱图呈现的不同形貌，使用多尺度的灰度共生矩阵方法提取出的角二阶矩、熵、对比度等特征可用于放电阶段的表征.
- 乙丙橡胶 /
- 局部放电 /
- 特征提取 /
- 灰度共生矩阵
Abstract: Due to the nonstandard manufacturing and installation of the ethylene propylene rubber (EPR) cable terminal for high-speed railways, air gap appears in the terminal, and the partial discharge at the air gap seriously affects the normal operation of high-speed trains. In order to analyze the partial discharge process and characteristics of the 25 kV EPR cable with air-gap defects, a cable sample with air-gap defects was fabricated. The discharge parameters and the development process of phase resolved partial discharge (PRPD) spectrum were measured from the initial discharge to sample breakdown. Based on the Gaussian pyramid and gray-level co-occurrence matrix, the PRPD spectrum of the whole discharge process is extracted. The results show that according to the change of discharge parameters, the whole discharge process can be divided into discharge development stage, discharge duration stage, and near-breakdown stage. Based on the different morphology of PRPD spectrum in each stage, the second-order angular moment, entropy, contrast and the like are extracted by the multi-scale gray-level co-occurrence matrix method and can be used to characterize the discharge stage.
- ethylene propylene rubber (EPR) /
- partial discharge /
- feature extraction /
- gray-level co-occurrence matrix

HTML全文

图 1 试验平台

Figure 1. Test platform

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图 2 试验加压方式示意

Figure 2. Schematic of test voltage-adding mode

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图 3 Q_peak、Q_avg、N随时间变化

Figure 3. Changes of Q_peak，Q_avg and N with time

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图 4 ${k_{{Q_{{\rm{peak}}}}}} $、${k_{{Q_{{\rm{avg}}}}}} $、k_N随时间变化

Figure 4. Changes of ${k_{{Q_{{\rm{peak}}}}}} $，${k_{{Q_{{\rm{avg}}}}}} $ and k_N with time

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图 5 放电量随时间变化

Figure 5. Discharge output varing with time

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图 6 放电发展阶段PRPD谱图随时间演变

Figure 6. Time-dependent evolution of PRPD spectra in discharge development stage

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图 7 放电持续阶段PRPD谱图随时间演变

Figure 7. Time-dependent evolution of PRPD spectra in discharge duration stage

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图 8 临近击穿阶段PRPD谱图随时间演变

Figure 8. Time-dependent evolution of PRPD spectra in near-breakdown stage

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图 9 绝缘内部气隙放电机理

Figure 9. Mechanism of air-gap discharge in insulation

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图 10 Gaussian金字塔构建过程

Figure 10. Gaussian pyramid formation process

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图 11 多尺度下特征量随时间变化趋势

Figure 11. Change tendency of features with time in multi-scale

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表 1 Gaussian金字塔图像系列特征

Table 1. Characteristics of Gaussian pyramid image series

序列	纹理种类	0	45°	90°	135°	平均值
level₀	ASM	0.921	0.920	0.920	0.920	0.920
	ENT	0.257	0.277	0.265	0.276	0.269
	CON	0.032	0.081	0.050	0.075	0.059
level₁	ASM	0.519	0.514	0.524	0.512	0.517
	ENT	1.851	1.906	1.818	1.908	1.871
	CON	0.255	0.265	0.247	0.284	0.263
level₂	ASM	0.362	0.355	0.356	0.312	0.346
	ENT	2.547	2.216	2.347	2.479	2.397
	CON	0.955	0.954	0.955	0.955	0.953
level₃	ASM	0.302	0.300	0.315	0.300	0.304
	ENT	2.434	2.655	2.022	2.584	2.424
	CON	0.996	1.237	0.494	1.244	0.993

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