Relays are the logic elements of a protection system which sense the fault and cause the circuit-breaker trip circuits to be energized and the breakers to open their contacts.
继电器是保护系统的逻辑元件，它感知故障，并使断路器解扣电路带电和断路器打开触点。
The paper mainly discusses the automatic switching of the logic estimation circuit of the drum boiler's water level protection system.
文章主要讨论了锅炉汽包水位高低保护系统逻辑判断回路的自动切换。
The article also indicated the structure and feature of the safety logic system from the view of factory-safety protection.
从工厂安全保护的角度分析了安全逻辑系统的结构和特点。
This paper introduces two common ways to implement protection system of steam turbine, one is to fulfil it in Distrubuted Control system and the other is to use Programmable Logic Controller.
介绍了汽轮机保护系统常见的两种实现方式，一是在分散控制系统中实现汽轮机保护系统，二是运用可编程控制器实现汽轮机保护系统。
To achieve the safe and reliable operation of high power supply in HL-2A Tokamak, an logic control and protection system based on Siemens PLC is applied.
给出了大功率电源控制系统的控制要求、功能和工作原理以及系统PLC硬件构成图和软件流程框图，总结了系统研制中一些实际问题的解决办法。
To achieve the safe and reliable operation of high power supply in HL-2A Tokamak, an logic control and protection system based on Siemens PLC is applied.
给出了大功率电源控制系统的控制要求、功能和工作原理以及系统PLC硬件构成图和软件流程框图，总结了系统研制中一些实际问题的解决办法。
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