Su Jingang, Zhang Peng, Huang Xingwang, Pang Xianhai
State Grid Hebei Electric Power Co., Ltd., Electric Power Science Research Institute, Shijiazhuang 050022, China.
Sensors (Basel). 2024 Sep 9;24(17):5843. doi: 10.3390/s24175843.
High-voltage cables are the main arteries of urban power supply. Cable accessories are connecting components between different sections of cables or between cables and other electrical equipment. The stress in the cold shrink tube of cable accessories is a key parameter to ensure the stable operation of the power system. This paper attempts to explore a method for measuring the stress in the cold shrink tube of high-voltage cable accessories based on ultrasonic longitudinal wave attenuation. Firstly, a pulse ultrasonic longitudinal wave testing system based on FPGA is designed, where the ultrasonic sensor operates in a single-transmit, single-receive mode with a frequency of 3 MHz, a repetition frequency of 50 Hz, and a data acquisition and transmission frequency of 40 MHz. Then, through experiments and theoretical calculations, the transmission and attenuation characteristics of ultrasonic longitudinal waves in multi-layer elastic media are studied, revealing an exponential relationship between ultrasonic wave attenuation and the thickness of the cold shrink tube. Finally, by establishing a theoretical model of the radial stress of the cold shrink tube, using the thickness of the cold shrink tube as an intermediate variable, an effective measurement of the stress of the cold shrink tube was achieved.
高压电缆是城市供电的主要动脉。电缆附件是电缆不同区段之间或电缆与其他电气设备之间的连接部件。电缆附件冷缩管中的应力是确保电力系统稳定运行的关键参数。本文尝试探索一种基于超声纵波衰减测量高压电缆附件冷缩管中应力的方法。首先，设计了一种基于现场可编程门阵列（FPGA）的脉冲超声纵波测试系统，其中超声传感器以单发射、单接收模式工作，频率为3兆赫兹，重复频率为50赫兹，数据采集和传输频率为40兆赫兹。然后，通过实验和理论计算，研究了超声纵波在多层弹性介质中的传播和衰减特性，揭示了超声波衰减与冷缩管厚度之间的指数关系。最后，通过建立冷缩管径向应力的理论模型，以冷缩管厚度作为中间变量，实现了对冷缩管应力的有效测量。
