Xiao Xinyan, Shi Yuhao, Cheng Lin, Yang Lanjun
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
Electric Power Research Institute, State Grid Shaanxi Electric Power Company, Xi'an 710100, China.
Rev Sci Instrum. 2024 Apr 1;95(4). doi: 10.1063/5.0203065.
In recent years, linearization technology for nonlinear devices has become a hot topic in many fields. In this study, a linear voltage divider based on metal oxide arresters was designed by combining linearization technology and electrical measurement technology to solve the objective problems of online voltage monitoring. These problems include high difficulty in equipment installation, low measurement accuracy, and poor economic benefits. Based on a summary of linearization theory, the sufficient and necessary conditions for the linearization of the voltage divider were deduced in detail. The relevant circuit simulations were conducted, along with voltage divider experiments under power frequency AC voltage, operating overvoltage, and lightning overvoltage. The results revealed that the voltage divider was able to realize linearized measurements and meet the relevant standards of online voltage monitoring. The measurement errors were concentrated in the transition region between the pre-breakdown region (small current region) and the breakdown region (nonlinear region) in the volt-ampere characteristic curve. The main influencing factor of errors was the consistency of the nonlinear characteristics of the high- and low-voltage arms of the voltage divider. The voltage divider designed in this study can be applied in many scenarios, such as power plants, substations, high-voltage electrical equipment manufacturing plants, and high-voltage laboratories.
近年来，非线性器件的线性化技术已成为众多领域的研究热点。本研究结合线性化技术与电测量技术，设计了一种基于金属氧化物避雷器的线性分压器，以解决在线电压监测中的客观问题。这些问题包括设备安装难度大、测量精度低以及经济效益差等。在总结线性化理论的基础上，详细推导了分压器线性化的充分必要条件。进行了相关电路仿真，并在工频交流电压、操作过电压和雷电过电压下进行了分压器实验。结果表明，该分压器能够实现线性化测量，满足在线电压监测的相关标准。测量误差集中在伏安特性曲线的预击穿区（小电流区）和击穿区（非线性区）之间的过渡区域。误差的主要影响因素是分压器高低压臂非线性特性的一致性。本研究设计的分压器可应用于多种场景，如发电厂、变电站、高压电气设备制造厂和高压实验室。
