交流1000V和直流1500V以下低压配电系统的电气安全保护措施的试验、测量或监测设备第11部分:TT、TN和IT系统中剩余电流监测器（RCM）的有效性

[中文适用范围]： 本部分IEC 61557规定了用于测试已安装在配电系统中的剩余电流监视器（RCM）有效性的测试设备的要求。该测试设备可用于任何类型的网络，如TN、TT或IT系统。该测试设备还可用于测试IT系统中具有方向辨别功能的剩余电流监视器（RCM）。本文档的目的不是根据产品标准验证剩余电流监视器（RCM）。 [外文原描述]： IEC 61557-11:2020 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 61557-11:2020 specifies the requirements for test equipment applied to the testing of the effectiveness of residual current monitors (RCM) that are already installed in distribution systems. This test equipment can be used in any kind of network, such as a TN, TT or IT system. The test equipment can also be used for testing directionally discriminating residual current monitors (RCM) in IT systems. It is not the purpose of this document to verify the residual current monitors (RCM) according to their product standards. IEC 61557-11:2020 cancels and replaces the first edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) document title modified to include all types of RCM; b) terms aligned with IEC 60050; c) addition of requirements for testing new types of RCM; d) moving of requirements for RCM Type B from former Annex A to main body text; e) alignment of the structure with that of the whole IEC 61557 series.