平衡态与非平衡态电弧等离子体微观特性计算研究综述

以SF_6、CO_2、C_3F_8、C_5F_(10)O等气体为主要介质,介绍了近三十年来国内外对平衡态与非平衡态电弧等离子体微观特性计算的研究进展。平衡态等离子体的微观特性研究,以粒子组分、统计热力学参数、输运系数以及混合扩散系数等物性参数计算为主。而非平衡态等离子体的微观特性研究是在量子化学计算理论的支持下,以化学反应和化学反应速率研究为基础,通过建立双温化学动力学模型来描述粒子浓度的时间演化规律。     

低压电器数字化分析方法及软件应用

介绍了一套低压电器数字化仿真分析设计软件.针对低压电器中各个部分设计优化的关键问题,开发了各功能模块.对典型低压电器的实例进行分析,结果表明,软件大大降低了低压电器仿真设计对操作人员的理论要求,对缩短低压电器研制周期并节省研制成本具有重要意义.     

空气介质直流断路器的现状

介绍了直流断路器能够实现的保护功能,分析了直流断路器研发过程中的技术难点.总结了直流断路器各个部分,如操作机构、触头系统、灭弧系统、脱扣系统等进行的研发设计工作,以及在直流断路器研发上取得的成果.     

开关柜绝缘子泄漏电流传感器的设计

绝缘子泄漏电流的检测是开关柜在线监测的一个重要方面。由于泄漏电流十分微弱,因此传感器的准确度和灵敏性至关重要。从电流互感器的误差角度入手,通过分析误差公式,讨论影响泄漏电流传感器准确度的6种因素,并设计了一套信号调理电路,同时对电流互感器和信号调理电路采取相应的保护措施。经实验验证所设计的泄漏电流传感器线性度误差为1.43%,分散性只有0.99%,满     

Numerical Simulation of the Eddy Current Effects on the Arc Splitting Process

This paper focuses on a numerical simulation of the arc plasma behavior in the arc splitting process,considering the eddy currents in the electrodes and the splitter plate.Based on three-dimensional(3D) magneto-hydrodynamic(MHD) theory,a thin layer of nonlinear electrical resistance elements is used in the model to represent the voltage drop of plasma sheath and the formation of new arc root in order to include the arc splitting process in the simulation.In the arcing process,eddy currents in metal parts are generated by a time-varying magnetic field.The arc model is calculated with the time-varying magnetic field term,so that the eddy current effects can be considered.The effect of nonlinear permeability of a ferromagnetic material is also involved in the calculation.Using the simulation results for the temperature,velocity and current density distribution,the arc splitting process is analyzed in detail.The calculated results are compared with the simulation neglecting eddy currents.     

Efficiency of Removing Sulfur Dioxide in the Air by Non-Thermal Plasma Along with the Application of the Magnetic Field

1 IntroductionSO2 is one of the main hazards to human health, andit is the main component of the acidic oxides in the at-mosphere. The menace of the acidic pollution by SO2can be curtailed if it is removed from the air. In recenttime, researchers across the world have been concernedabout efficient removal of SO2.Several techniques have been applied to decompos-ing SO2 in the air in recent years. At present, themain technologies for removing sulfur dioxide include:the gas-phase reaction [1]…     

Simulation of the Process of Arc Energy-Effect in High Voltage Auto-Expansion SF6 Circuit Breaker

A new magnetic hydro-dynamics （MHD） model of arc in H.V. auto-expansion SF6 circuit breaker that takes into consideration nozzle ablation due to both radiation and thermal conduction is presented in this paper. The effect of PTFE （polytetrafluorethylene） vapor is considered in the mass, momentum and energy conservation equations of the constructed model. Then, the gas flow fields with and without conduction considered are simulated. By comparing the aforementioned two results, it is indicated that the arc＇s maximal temperature with conduction considered is 90 percent of that without considering conduction.     

基于CAN总线的高压开关柜状态监测单元通讯模块的设计

高压开关柜作为电力系统的关键设备,对它的运行状态进行在线监测具有重大的意义。为了避免监测单元成为信息的孤岛,有必要使监测单元具有通讯能力。笔者在分析CAN协议的基础上,开发了基于CAN总线的高压开关柜状态在线监测单元的通讯模块,并给出了软硬件设计详细的流程。     

低压电器仿真技术及其应用

介绍了低压电器仿真技术的发展现状和常用软件,探讨低压电器仿真技术应用,包括热过程分析、电磁暂态过程特性分析、机构动作特性分析、开关电弧分析。并结合实际情况给出了仿真技术具体的典型应用。仿真技术对低压电器行业的发展有快速推进的作用。     

考虑电极烧蚀影响的低压断路器电弧运动特性仿真及实验

以磁流体动力学(magnetic hydro-dynamics,MHD)为基础建立了考虑电极烧蚀影响的低压断路器中电弧的数学模型。在传统的质量、动量和能量守恒方程的基础上增加了铜蒸气的浓度方程,考虑电极烧蚀对气体的热动力学特性和传输系数的影响,针对阴极和阳极不同特点分别建立了电弧与阴极和阳极作用的数学模型。利用基于有限容积法的商业软件对上述模型进行求解,得出灭弧室内温度场、浓度场、气流场、电位场的分布情况。仿真结果表明,由于电极附近“双漩涡”的存在,使得Cu蒸气浓度最大的区域位于弧根后方靠近电极的区域;考虑Cu蒸气影响时计算得到的电弧电压为比未考虑Cu蒸气影响时减小12.3%;考虑Cu蒸气影响所得到的电弧平均运动速度比未考虑Cu蒸气影响时减少21.3%。实验结果验证了仿真模型的合理性。