凌智敏（深圳市建筑设计研究总院有限公司，广东省深圳市 518031）

低压配电系统内电源侧的直接接地和一点接地（凌智敏）

Direct Grounding and One Point Grounding of Power Supply Side

in Low Voltage Distribution System

LING Zhimin（Shenzhen General Institute of Architectural Design and Research

Co.,Ltd.,Shenzhen 518031,Guangdong Province，China）

    Abstract：The evolution process of grounding mode of low voltage distribution system in China is briefly introduced,with emphasis on the grounding mode of power supply side in the system:direct grounding and one point grounding. The importance of preventing stray current and stray electromagnetic field from interfering with information equipment and system in the information age is expounded, and the implementation of N‑wire one point grounding is recommended in multi‑power TN system.

    Key words：multi‑power TN system;stray current;“grounding and neutral connection”;grounding mode of power supply side in low voltage distribution system;direct grounding;one point grounding;star connection point;neutral point

  摘　要：简要介绍我国低压配电系统接地方式演变过程，重点介绍系统内电源侧的接地方式：直接接地和一点接地。阐述信息时代的今天，防止杂散电流、杂散电磁场对信息设备及系统干扰的重要性，推荐在多电源的TN系统中实施N线的一点接地。

  关键词：多电源的TN系统；杂散电流；“接地与接零”；低压配电系统电源侧的接地方式；直接接地；一点接地；星形联结点；中性点

  中图分类号：TU852　　　　  　 文献标识码：A

    doi：10.3969 / j. issn.1003 － 8493.2020.11.002