IEC 61000-4-18:20 19重点介绍了电气和电子设备在运行条件下的抗扰度要求和测试方法，涉及: a)主要发生在安装在高压和中压(HV/MV)变电站中的电力、控制和信号电缆中的重复慢阻尼振荡波； b)由于高空电磁脉冲(HEMP)现象，主要发生在安装在气体绝缘变电站(GIS)中的电力、控制和信号电缆中，在某些情况下也发生在空气绝缘变电站(AIS)或任何装置中的重复快速阻尼振荡波。 本文件的目的是建立一个通用且可重复的参考，用于评估电气和电子设备在电源、信号、控制和接地端口上受到阻尼振荡波时的抗扰度。IEC 61000本部分中记录的测试方法描述了评估设备或系统对规定现象的抗扰度的一致方法。注:如IEC指南107所述，这是供IEC产品委员会使用的基本EMC出版物。正如指南107中所述，IEC产品委员会负责确定该抗扰度测试标准是否适用，如果适用，则负责确定适当的测试水平和性能标准。该文件定义: 测试电压和电流波形； 测试水平范围； 测试设备； 测试设备的校准和验证程序； 测试设置； 测试程序。 本第二版取消并取代2006年出版的第一版及其修正案1:2010.本版是技术性修订。与上一版相比，此版本包括以下重大技术变更: a)添加阻尼振荡波形的数学模型； b)关于测量不确定度的新附件B； c)添加高速CDN； d)增加CDN的校准程序； e)增加在互连线上使用电容耦合钳位以用于快速衰减振荡波； f)在CDN不工作的情况下增加DC/DC转换器的测试程序； g)关于与在输入端具有DC/DC转换器的EUT供电相关的问题的新附件C。 关键词:电工电子设备抗扰度要求及试验方法

IEC 61000-4-18: 2019 focuses on the immunity requirements and test methods for electrical and electronic equipment, under operational conditions, with regard to:
a) repetitive slow damped oscillatory waves occurring mainly in power, control and signal cables installed in high voltage and medium voltage (HV/MV) substations;
b) repetitive fast damped oscillatory waves occurring mainly in power, control and signal cables installed in gas insulated substations (GIS) and in some cases also air insulated substations (AIS) or in any installation due to high-altitude electromagnetic pulse (HEMP) phenomena.
The object of this document is to establish a common and reproducible reference for evaluating the immunity of electrical and electronic equipment when subjected to damped oscillatory waves on supply, signal, control and earth ports. The test method documented in this part of IEC 61000 describes a consistent method to assess the immunity of an equipment or system against a defined phenomenon. NOTE As described in IEC Guide 107, this is a basic EMC publication for use by product committees of the IEC. As also stated in Guide 107, the IEC product committees are responsible for determining whether this immunity test standard is applied or not, and if applied, they are responsible for determining the appropriate test levels and performance criteria. The document defines:
test voltage and current waveforms;
ranges of test levels;
test equipment;
calibration and verification procedures of test equipment;
test setups;
test procedure.
This second edition cancels and replaces the first edition published in 2006 and its Amendment 1:2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) addition of a mathematical modelling of damped oscillatory wave waveform;
b) new Annex B on measurement uncertainty;
c) addition high speed CDN;
d) addition of calibration procedures for CDNs;
e) addition of the use of the capacitive coupling clamp on interconnection lines for fast damped oscillatory waves;
f) addition of a test procedure for DC/DC converters in case the CDN does not work;
g) new Annex C on issues relating to powering EUTs having DC/DC converters at the input.
Keywords: immunity requirements and test methods for electrical and electronic equipment