Abstract: Abstract：The three actions of protect earthing and the three actions of common bonding for instruments and control system earthing purpose are introduced in the article. As earthing functions, earthing types can consist of protect earthing, instrument common earthing, shield earthing, intrinsical earthing, electrostatic protective earthing, lightning protective earthing, etc. According to basic concept, working principle and electrical property, earthing schemes such as star bonding，net bonding and star-net mix bonding are introduced and benefit of net bonding. According to principle of safety power utilization, it is recommend that equipotential bonding and electricity common earthing system. Engineering methods and bonding types of earthing are discucced. Anti electrical disturb effects and earthing philosophy and notes are discucced that often used methods for engineering design and implement.

摘要： 摘要：本文从仪表及控制系统接地的目的谈起，介绍了保护接地的三个作用和工作接地的三个作用，按接地功能将接地分为：保护接地、工作接地、屏蔽接地、本质安全系统接地、防静电接地和防雷接地等。分析了不同接地的基本概念、工作原理和电气性质。根据接地的基本原理讨论了接地的工程方法、接地方式，分析了星型接地、网型接地及星型—网型复合接地的方案以及网型接地的优点。根据安全用电的原则，提倡采用等电位连接、与电气专业共用接地装置。讨论了仪表及控制系统接地的抗干扰作用以及相关的接地原则及工程设计和实施的注意事项。

关键词: 仪表及控制系统接地，保护接地，仪表工作接地，接地连接方式，星型接地，网状接地，共用接地系统, Instruments and Control System，Protective earthing，Instrument common earthing，Bonding modules，Star Bonding，Net Bonding，Common Use Earthing System