State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China.
Chongqing Electric Power Research Institute, Chongqing Electric Power Company, Chongqing 401123, China.
Sensors (Basel). 2023 Apr 8;23(8):3830. doi: 10.3390/s23083830.
The status of zinc oxide (ZnO) arresters is directly related to the safety of power grids. However, as the service life of ZnO arresters increases, their insulation performance may decrease due to factors such as operating voltage and humidity, which can be identified through the measurement of leakage current. Tunnel magnetoresistance (TMR) sensors with high sensitivity, good temperature stability, and small size are excellent for measuring leakage current. This paper constructs a simulation model of the arrester and investigates the deployment of the TMR current sensor and the size of the magnetic concentrating ring. The arrester's leakage current magnetic field distribution under different operating conditions is simulated. The simulation model can aid in optimizing the detection of leakage current in arresters using TMR current sensors, and the findings serve as a basis for monitoring the condition of arresters and improving the installation of current sensors. The TMR current sensor design offers potential advantages such as high accuracy, miniaturization, and ease of distributed application measurement, making it suitable for large-scale use. Finally, the validity of the simulations and conclusions is verified through experiments.
氧化锌（ZnO）避雷器的状态直接关系到电网的安全。然而，随着氧化锌避雷器使用寿命的增加，其绝缘性能可能会因工作电压和湿度等因素而下降，可以通过泄漏电流的测量来识别。具有高灵敏度、良好温度稳定性和小尺寸的隧道磁阻（TMR）传感器非常适合测量泄漏电流。本文构建了避雷器的仿真模型，研究了 TMR 电流传感器的布置和磁集中环的尺寸。模拟了不同运行条件下避雷器的泄漏电流磁场分布。该仿真模型有助于优化 TMR 电流传感器对避雷器泄漏电流的检测，研究结果为监测避雷器的状况和改进电流传感器的安装提供了依据。TMR 电流传感器的设计具有高精度、小型化和易于分布式应用测量等优点，适合大规模使用。最后，通过实验验证了模拟和结论的有效性。
