低压电涌保护器用元器件—第331部分：金属氧化物变阻器（MOV）的性能要求和试验方法（2.0版）

[中文适用范围]： IEC 61643 的这一部分是金属氧化物压敏电阻 (MOV)@ 的测试规范，用于电力线@或电信@或信号电路中高达 1 000 V AC 或 1 500 V DC 的应用。它们旨在保护设备或人员@或两者@免受高瞬态电压的影响。本规范适用于具有两个电极和混合过压保护组件的 MOV。本规范也不适用于安装及其对 MOV 特性的影响。给出的特性仅适用于仅按照测试描述的方式安装的 MOV。 [外文原描述]： IEC 61643-331:2017 is a test specification for metal oxide varistors (MOV), which are used for applications up to 1 000 V AC or 1 500 V DC in power line, or telecommunication, or signalling circuits. They are designed to protect apparatus or personnel, or both, from high transient voltages. This specification applies to MOVs having two electrodes and hybrid overvoltage protection components. This specification also does not apply to mountings and their effect on the MOV’s characteristics. Characteristics given apply solely to the MOV mounted only in the ways described for the tests. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Update of the nominal varistor voltage test method; b) Addition of thermally protected varistors – component symbol and test methods; c) Addition of nominal discharge current – test methods; d) Addition of voltage ratings for disc types (Table 1); e) Addition of test currents for clamping voltage of disc types (Table 2); f) Addition of typical voltage ratings of SMD types (Table 3); and g) Addition of Limited current and temporary overvoltage tests for thermally protected varistors. Keywords: metal oxide varistors (MOV), high transient voltages.