| 倪辉,吴旭涛,余海博,程养春,何宁辉,马波,马云龙,李日东,郑夏晖,邢琳.10 kV交联聚乙烯电缆中超声波传播规律*[J].,2020,39(4):589-597 |
| 10 kV交联聚乙烯电缆中超声波传播规律* |
| The propagation characteristics of ultrasonic wave on 10 kV XLPE cable |
| 投稿时间：2019-10-23 修订日期：2020-06-28 |
| 中文摘要: |
| 电缆局放会产生超声波，利用超声波可以进行局放定位和大小估计。为了研究电缆中局放超声波的传播规律，利用COMSOL建立了基于10 kV交联聚乙烯电力电缆本体的声压场仿真模型，探究了超声波在电缆中的扩散过程和电缆表面超声波峰峰值随传播距离的变化规律之间的关系，并在真实10 kV单相交联聚乙烯电缆上进行了超声波衰减实验，探究了真实电缆表面超声波峰峰值随传播距离的衰减规律。结果表明：电缆表面声波峰峰值随传播距离的衰减符合指数规律，衰减系数?=0.07 Np/mm(或0.62 dB/mm)，并且是电缆内部声波的扩散过程导致了电缆表面声波峰峰值的严重衰减。据此，针对10 kV 交联聚乙烯电缆，建议将局放超声传感器安装在距离局放易发位置100 mm以内，还提出了判断电缆中局放超声波扩散过程结束位置的方法，为确定其他类似型号电缆安装超声传感器的位置提供参考。 |
| 英文摘要: |
| The partial discharge of cable will produce ultrasonic wave, which can be used to estimate the location and size of partial discharge. In order to study the propagation law of the ultrasonic wave of partial discharge in the cable, a simulation model of the sound pressure field based on the body of 10 kV XLPE power cable is established by using COMSOL. The relationship between the diffusion process of the ultrasonic wave in the cable and the variation law of the peak-to-peak value of the ultrasonic wave on the cable surface with the propagation distance is explored. The ultrasonic attenuation experiment is carried out on the real 10 kV single-phase XLPE cable. The attenuation law of the peak-to-peak value of ultrasonic wave on the real cable surface with the propagation distance is studied. The results show that the attenuation of the peak-to-peak value of acoustic wave on the cable surface with the propagation distance conforms to the exponential law, and the attenuation coefficient α = 0.07 Np/mm (or 0.62 dB/mm), and it is the diffusion process of acoustic wave inside the cable that causes the serious attenuation of the peak-to-peak value of acoustic wave on the cable surface. Accordingly, for 10 kV XLPE cable, it is suggested to install the partial discharge ultrasonic sensor within 100mm from the place where the partial discharge is easy to occur, and the method to judge the end position of the diffusion process of partial discharge ultrasonic inside the cable is also proposed, which provides a reference for determining the place where other similar cables are installed with the ultrasonic sensor. |
| DOI：10.11684/j.issn.1000-310X.2020.04.013 |
| 中文关键词: 交联聚乙烯电力电缆 局部放电 超声衰减 扩散过程 |
| 英文关键词: XLPE power cable Partial discharge Attenuation of ultrasonic Diffusion process |
| 基金项目:国网宁夏电力有限公司科技项目(5229DK17000P) |
|
| 摘要点击次数: 1569 |
| 全文下载次数: 2132 |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
