The Influence of Medium on Low-Voltage Circuit Breaker Arcs

This paper mainly focuses on the influence of three kinds of media： air, air-10%PA （Nylon） and air-10% POM （polyoxymethylene） on low-voltage circuit breaker arcs. A threedimensional （3-D） model of arc motioa under the effect of external magnetic field is built based on magnetohydrodynamics （MHD） equations. By adopting the commercial computational fluid dynamics （CFD） package based on the control-volume method, the above MHD equations are solved. For the media of air-10%PA and air-10%POM, the distributions of stationary temperature and electrical potential and the transient motion processes are compared with those of air arc. The research shows that both air-10%PA and air -10% POM can cool the arc plasma and the former is more effective. Both of them can increase the stationary voltage as well. Moreover, the presence of the two mixtures can accelerate the arc motion toward the quenching area and ensures the arc quenched in time.     

断路器综合在线监测系统研制

开发了一套断路器运行状态在线监测系统,能实现包括机械、绝缘、温升等多种断路器运行特性的综合监测。该系统采用上、下位机结构,下位机是一个基于96单片机的数据采集系统,并拥有简单的人机接口,硬件设计中采用了PSD器件,大大提高了软件维护的灵活性。基于任务调度的下位机软件结构,保证了系统的稳定性和实时性。上位机实现数据的存储、状态量的显示和波形的显示;上下位机之间采用485串行通讯总线进行通讯。     

Numerical Simulation of Gas Flow During Arcing Process for 252 kV Puffer Circuit Breakers

A numerical simulation model for 252 kV puffer circuit breaker is constructed, by using a proven commercial computational fluid dynamics （CFD） package, PHOENICS...     

基于快速转换开关的新型液态金属限流器的研究

提出了一种基于快速转换开关的新型液态金属限流器（LMCL）的拓扑结构,在充分利用LMCL快速起弧限流特性的同时,有效提高了限流器的额定通流能力,降低了LMCL额定通流要求。给出了限流器的工作原理及快速转换开关的动作特性。完成了不同短路预期电流下限流装置的限流试验。试验结果证明,提出的新型限流器能够快速、有效限制短路电流,具有良好的应用前景,并为液态金属限流技术的应用提供了一种新的思路。     

高压直流金属回路转换开关中自激振荡开断电流的数值仿真分析（英文）

This paper presents a numerical study of the current self-excited oscillations during the opening of high voltage direct current(HVDC) metallic return transfer breaker(MRTB).The switching arc is simulated using the magneto-hydrodynamics(MHD) theory coupled with the electric circuit variation.The simulation is proved accurate in simulating the current oscillation and the commutation process in MRTB by the good agreement between the calculated results and the experimental results,which are obtained on a MRTB prototype designed to break about 5 kA of DC current.Both kinds of the results show that the current oscillation starts at about 16.5 ms and the total arc time is about 24 ms with a commutation capacitor bank of 72 μF and an inductor of 173 μH.With a further analyze on how circuit parameters influence arc current oscillations,this study helps to improve the current interruption capability of MRTB.     

数字化电力设备的概念与内涵

根据数字电力系统建设的要求和电力设备自身发展的需要,结合信息技术的发展方向,提出了数字化电力设备的概念与内涵。着重归纳了数字化电力设备的基本特征和完整概念,以及发展数字化电力设备主要需要研究和解决的理论与技术问题,并且根据当前技术发展趋势,预测了未来数字化电力设备的应用前景和可能的发展方向。     

AgMeO材料触头的电弧侵蚀形貌特征

在CKS-1．4kA触头材料自动测试仪上在几百安以下电流对AgMeO材料触头进行了大量分断电流试验，用SEM扫描电镜和光学金相显微镜进行了一系列微观测试拍照，EDAX能谱仪和x射线衍射分析了表面及剖面的元素成分分布，归纳出AgMeO触头材料的五种侵蚀形貌特征，分析了它们对触头工作性能的影响。     

真空断路器机械特性的在线监测方法

研究了真空断路器机械特性的在线监测方法。采用角位移传感器间接测量动触头的行程曲线,有效解决了直线位移传感器安装困难和高电位隔离的问题;通过监测操作过程中的振动信号,得到了在线状态下动静触头的关合和刚分时刻;用霍尔电流传感器监测分合闸线圈电流,配合动触头位移曲线,得到反映真空断路器机械特性的多个特征参量。     

Numerical Simulation of Low Current Vacuum Arc Supersonic Flow

Based on a two-dimensional axisymmetric magneto-hydrodynamic （MHD） model, low current vacuum arc （LCVA） characteristics are studied. The influence of cathode process under different axial magnetic fields and different anode radii on LCVA characteristics is also simulated. The results show that the influence of both cathode process and anode radii on LCVA is significant. The sign of anode sheath potentials can change from negative to positive with the decrease of anode radii. The simulation results are in part verified by experimental results. Especially, as the effect of ion kinetic energy is considered, ion temperature is improved significantly; which is in agreement with experimental results.     

高气压电弧的状态及其转换

阐明了高气压条件下(1个大气压及以上)电器分断电路过程中金属蒸气态电弧和气体态电弧及其转换这一物理事实;简要论证了电弧状态及其转换对电极材料侵蚀机理、电弧停滞时间和电弧移动特性等科学问题的重要性;较系统地分析了金属蒸气的形成原因和扩散机理。