氧化锌非线性电阻的工频特性.pdfVIP

Electrical Engineering and Automation December 2013, Volume 2, Issue 4, PP.38-43 Properties of a ZnO Non-linear Resistor Energized with Power Frequency Sources # Nanfa Zhang, Zhen Sun , Liuhua Ding Changzhou TT Elec. Circuitry Protection Technology Co., Ltd, Changzhou Jiangsu Province 213164, P.R. China #E-mail:163.com Abstract The waveshapes of voltage and current of a ZnO non-linear resistor (MOV) were recorded by means of a digital storage oscilloscope where the MOV were energized with two types of power frequency source of sine-wave, that is, a constant current source and a constant voltage source. The data sampled by the oscilloscope were studied, based on which some important properties of the MOV energized with power frequency source were discovered. The discoveries demonstrated that some currently used test methods for measuring power-frequency parameters of an MOV are not suitable to the MOV’s properties, and hence, the new measuring methods were developed in this paper. Keywords: ZnO Arrester; Metal Oxide Varistor; Surge Protective Device; Power Frequency Characteristic; Resistive Current; Power Loss 氧化锌非线性电阻的工频特性 # 张南法，孙祯 ，丁留华 常州市天泰电路保护技术有限公司，江苏 常州 213164 摘 要：用数字存储示波器记录了氧化锌非线性电阻器（MOV ）在工频恒压源和恒流源条件下的电压和电流波形，通过分 析示波器的采样数据，揭示了氧化锌非线性电阻不同于线性电阻的多项特性，证明了现在普遍采用的几个测量MOV 工频特 性的方法，与MOV 的实际特性并不相符合，为此，本文提出了新的测试方法。 关键词：氧化锌避雷器；氧化锌压敏电阻器；电涌保护器；工频特性测量；电阻性电流；功率损耗 引言 氧化锌非线性电阻器，或称为金属氧化物压敏电阻器(MOV) ，已被大量用作电力避雷器阀片和低压浪涌保 护器(SPD)的主保护元件。在这些应用中，MOV 的工频特性，特别是电阻性电流IR 或功耗PR ，是生产和应用中 都要经常检测的参数，因为它们与工作可靠性和寿命直接相关。但现行的一些测定方法并不正