作者：周孜毅¹, 祁宏昌², 刘远¹, 黄嘉盛², 吴倩², 洪晓斌¹

作者单位：1. 华南理工大学机械与汽车工程学院, 广东 广州 510641;
2. 广州供电局输电管理所, 广东 广州 510310

关键词：非线性超声导波;高压电缆;瓷套式终端;液位检测

摘要：

瓷套式高压电缆终端内部油液泄漏问题是关系到高压电缆正常安全运行的关键因素，该文提出一种基于非线性超声导波的液位检测方法。首先，分析非线性超声导波检测机理并确定激励频率；其次，采用离散傅里叶变换将信号转换为频域并计算不同液位高度的非线性系数；最后，搭建瓷套管液位检测平台并进行系列实验。实验结果表明：由于瓷套管内油液的存在，接收信号的强度会出现明显下降；非线性系数随着液位高度的增加也不断增加，可以有效评估瓷套管内液位高度。

Liquid level detection of high voltage cable porcelain termination based on nonlinear ultrasonic guided wave
ZHOU Ziyi¹, QI Hongchang², LIU Yuan¹, HUANG Jiasheng², WU Qian², HONG Xiaobin¹
1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China;
2. Transmission Management Institute of Guangzhou Power Supply Bureau, Guangzhou 510310, China
Abstract: Leakage of porcelain termination is a key factor related to the safe operation of high voltage cable. This paper developed a nonlinear ultrasonic guided wave liquid level detection method for the porcelain termination. First, the mechanism of nonlinear ultrasonic guided wave was analyzed and the excitation frequency was determined. Then, discrete Fourier transformation was used to transform the signal into frequency domain and the nonlinear coefficient of different liquid level was calculated. Finally, the experimental setup was established and a series of liquid level detection experiment were carried out. The result shows that because the presence of silicone oil in the porcelain termination, the intensity of the received signal will decrease significantly. The nonlinear coefficient increases with the liquid level which could use to evaluate the height of liquid.
Keywords: nonlinear ultrasonic guided wave;high voltage cable;porcelain termination;liquid level detection
2019, 45(1):134-138  收稿日期: 2018-07-25;收到修改稿日期: 2018-09-13
基金项目: 中国南方电网有限责任公司科技项目（GZM2015-1-0011）
作者简介: 周孜毅(1993-),男,广东广州市人,硕士研究生,专业方向为仪器仪表工程
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