IEC 61557-5:2019 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5部分:接地电阻

标准编号：IEC 61557-5:2019

中文名称：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5部分:接地电阻

英文名称：Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - Part 5: Resistance to earth

发布日期：2019-07-26

标准范围

IEC 61557-5:20 19作为IEC 61557-5:20 19 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 61557-5:20 19规定了适用于使用交流电压测量对地电阻的测量设备的要求。IEC 61557-5:20 19取消并取代了2007年发布的第二版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更:a)修改第3条中的定义和符号；b)第4条中的子条款经过重组并与该系列的其他部分保持一致；c)降低电压25 V RMS或35 V峰值的限值从4.5移除；d)增加了对夹具的要求；e)第5条中增加的对地额定电压和测量类别的标记；f)第5条中增加的关于不存在危险电压的警告；g)将第6条中的术语“操作不确定性百分比”替换为“操作不确定性”；h)表1中校正的不确定度方程；i)增加了关于带环夹的测试测量的新附录A。

IEC 61557-5:2019 is available as IEC 61557-5:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61557-5:2019 specifies the requirements applicable to measuring equipment for measuring the resistance to earth using an AC voltage. IEC 61557-5:2019 cancels and replaces the second edition published in 2007. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) definitions and symbols in Clause 3 modified;
b) subclauses in Clause 4 restructured and aligned with other parts of the series;
c) limits for reduced voltages 25 V RMS or 35 V peak removed from 4.5;
d) requirements for clamps added;
e) marking for rated voltages to earth and measurement category added to Clause 5;
f) warning about absence of hazardous voltage added in Clause 5;
g) the term "percentage operating uncertainty" replaced by "operating uncertainty" in Clause 6;
h) equation for uncertainty corrected in Table 1;
i) new Annex A on test measurements with loop clamps added.

标准预览图