This paper gives the detail description of the safe system structure and its function in the oil field automation. Also, it gives the basic steps for safety system design by using PLC.
这篇文章对安全保护系统在油田自动化中的作用及组成给予了详细的描述，也给出了用PLC设计安全保护系统的基本步骤。
Bazalgette's design included a safety valve: when too much waste enters the system, raw sewage runs into the River Thames.
巴扎尔吉特当初设计了一个安全阀，当管网中的污水太多时，不经处理的污水便直接注入泰晤士河。
The design, construction and operating condition of grounding equipment affect not only safety operation of power system but also electromagnetic interference of substation.
接地装置的设计施工及运行情况的好坏不仅影响电力系统安全运行，也是影响变电站电磁干扰的重要方面。
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