NRS 039-1-1999
配电系统用电涌放电器．第1部分：无间隙金属氧化物电涌放电器应用指南已作废

Surge arresters for use in distribution systems Part 1: Guide for the application of gapless metal-oxide surge arresters

NRS 039-1-1999 发布历史

This part of NRS 039 covers the selection and application of gapless metal-oxide surge arresters for use in medium-voltage distribution systems to protect electrical equipment connected to these systems. The choice of the arrester and its application depend upon the Basic Insulation Level (BIL) of the system, and the equipment that is to be protected. NOTE 1 The selection of protection methods against overvoltages is based upon economics, taking into account the assessed probability of an overvoltage exceeding withstand capacities and the effects of a disruptive flashover. NOTE 2 The positioning of surge arresters on the low-voltage side of transformers is also recommended under certain conditions. NOTE 3 A medium-voltage distribution system is considered to be a system that has a nominal voltage that exceeds 1 kV but does not exceed 44 kV.

NRS 039-1-1999由ZA-SANS 发布于 1999，于 2008-10-24 废止。

NRS 039-1-1999的历代版本如下：

• 1999年 NRS 039-1-1999 配电系统用电涌放电器．第1部分：无间隙金属氧化物电涌放电器应用指南
• 2008年10月24日 NRS 039-1-2008 配电系统用防过载放电器.第1部分:无间隙金属氧化物防过载放电器应用指南

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标准号

NRS 039-1-1999

发布日期

1999年

实施日期

废止日期

2008-10-24

发布单位

ZA-SANS

适用范围

This part of NRS 039 covers the selection and application of gapless metal-oxide surge arresters for use in medium-voltage distribution systems to protect electrical equipment connected to these systems. The choice of the arrester and its application depend upon the Basic Insulation Level (BIL) of the system, and the equipment that is to be protected. NOTE 1 The selection of protection methods against overvoltages is based upon economics, taking into account the assessed probability of an overvoltage exceeding withstand capacities and the effects of a disruptive flashover. NOTE 2 The positioning of surge arresters on the low-voltage side of transformers is also recommended under certain conditions. NOTE 3 A medium-voltage distribution system is considered to be a system that has a nominal voltage that exceeds 1 kV but does not exceed 44 kV.