The wiring correctness of differential protection current loop can be verified by using phasor analyzing method and on load test method. These two methods were described.
差动保护电流回路接线是否正确，可通过相量分析法和带负荷测六角图检验法进行判断。简要介绍这两种方法，并介绍了利用潮流方向验证六角图的方法。
Traditional loop gain simulation method is based on two-port network models, which is complex to analysis and it is not suitable to get quantitative analysis of the loop gain fast.
传统的反馈环路增益仿真方法基于有源双端口网络，分析复杂，不利于快速得到环路的定量分析。
A new Measuring and controlling system of moisture ratio in molding sand based on two level closed loop control is presented, and setting method of temperature compensation factor is described.
提出了一种基于两级闭环控制的新型型砂水分控制系统，阐述了温度补偿系数的设定方法。
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