Electromagnetic relay is a widely used apparatus which usually works in a magnetic disturbance environment. To evaluate its electromagnetic compatibility (EMC) in a static magnetic field, dynamic characteristics of a ...Electromagnetic relay is a widely used apparatus which usually works in a magnetic disturbance environment. To evaluate its electromagnetic compatibility (EMC) in a static magnetic field, dynamic characteristics of a clapper relay in a uniform static magnetic field situation based on the finite element method (FEM) is studied. Influences of the magnetic field on dynamic parameters (delay time, pick-up time, end pressure, and final velocity) as well as a situation in which the relay cannot function normally are analyzed. Simulation reveals that the external magnetic field which weakens the relay’s air-gap field has a greater influence on the relay’s dynamic parameters than the one strengthening the field. The validity of the simulation is verified by measured results of coil current and armature displacement.展开更多
The coordination correctness of Nuclear power plant current transformer (CT)/ voltage transformer (PT) polarity and relay protection is often verified through the dynamic test on the unit no load / load operating cond...The coordination correctness of Nuclear power plant current transformer (CT)/ voltage transformer (PT) polarity and relay protection is often verified through the dynamic test on the unit no load / load operating conditions. This paper proposes a test method to prevent and circumvent the failure of the dynamic test abnormality caused by the static power test before the plant power is applied and the whole group is started. Reduce the dynamic test workload and test difficulty, to ensure that the dynamic test safety risk control and control in the state.展开更多
首先介绍了华能天津IGCC示范电站燃气机组静态变频装置(Staic Frequency Converter,SFC)的组成、工作原理;然后根据燃气机组现场启动调试经验,分析了燃气机组SFC隔离开关和并网断路器的闭锁逻辑可能出现的问题、发电机短路试验应注意的...首先介绍了华能天津IGCC示范电站燃气机组静态变频装置(Staic Frequency Converter,SFC)的组成、工作原理;然后根据燃气机组现场启动调试经验,分析了燃气机组SFC隔离开关和并网断路器的闭锁逻辑可能出现的问题、发电机短路试验应注意的事项以及SFC对继电保护的影响,并给出了参考性建议,可对类似启动调试工作提供借鉴。展开更多
基金Project (No. 513230502) supported by the PLA General ArmamentDepartment of China
文摘Electromagnetic relay is a widely used apparatus which usually works in a magnetic disturbance environment. To evaluate its electromagnetic compatibility (EMC) in a static magnetic field, dynamic characteristics of a clapper relay in a uniform static magnetic field situation based on the finite element method (FEM) is studied. Influences of the magnetic field on dynamic parameters (delay time, pick-up time, end pressure, and final velocity) as well as a situation in which the relay cannot function normally are analyzed. Simulation reveals that the external magnetic field which weakens the relay’s air-gap field has a greater influence on the relay’s dynamic parameters than the one strengthening the field. The validity of the simulation is verified by measured results of coil current and armature displacement.
文摘The coordination correctness of Nuclear power plant current transformer (CT)/ voltage transformer (PT) polarity and relay protection is often verified through the dynamic test on the unit no load / load operating conditions. This paper proposes a test method to prevent and circumvent the failure of the dynamic test abnormality caused by the static power test before the plant power is applied and the whole group is started. Reduce the dynamic test workload and test difficulty, to ensure that the dynamic test safety risk control and control in the state.
文摘首先介绍了华能天津IGCC示范电站燃气机组静态变频装置(Staic Frequency Converter,SFC)的组成、工作原理;然后根据燃气机组现场启动调试经验,分析了燃气机组SFC隔离开关和并网断路器的闭锁逻辑可能出现的问题、发电机短路试验应注意的事项以及SFC对继电保护的影响,并给出了参考性建议,可对类似启动调试工作提供借鉴。
