Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：智能电网技术的发展给高压开关设备智能化提出了新的要求和挑战。本文 依据高压开关智能化要求，自监测、自诊断和自控制能力，设计真空断路器智能化过 程中触头系统电磨损在线监测装置。该装置触头系统磨损量计算采用改进的开断电流 累计加权方法，其中权值的选择和磨损总量的计算依据电寿命曲线采用最小二乘法拟 合得到，该法具有通用性，可应用于不同型号的真空断路器；加权积分系数 K，采用 训练好的 LM-BP 神经网络，进行动态预测，使 K 值的选择更加符合工程实际；采用 燃弧时间感应器对燃弧时间进行采集，且给出燃弧时间感应器的安装位置和采用的屏 蔽措施；硬件处理核心采用 TMS320F2812 微处理芯片，主要负责算法处理、上位机通 信和 CAN-BUS 控制器局域网通信；短路电流采用罗氏线圈进行采集，且设计电流处 理电路，并给出 2812AD 采样校正办法；最后给出触头系统磨损量在线监测软件流程 和设计时应注意的关键技术。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：智能电网技术的发展给高压开关设备智能化提出了新的要求和挑战。本文 依据高压开关智能化要求，自监测、自诊断和自控制能力，设计真空断路器智能化过 程中触头系统电磨损在线监测装置。该装置触头系统磨损量计算采用改进的开断电流 累计加权方法，其中权值的选择和磨损总量的计算依据电寿命曲线采用最小二乘法拟 合得到，该法具有通用性，可应用于不同型号的真空断路器；加权积分系数 K，采用 训练好的 LM-BP 神经网络，进行动态预测，使 K 值的选择更加符合工程实际；采用 燃弧时间感应器对燃弧时间进行采集，且给出燃弧时间感应器的安装位置和采用的屏 蔽措施；硬件处理核心采用 TMS320F2812 微处理芯片，主要负责算法处理、上位机通 信和 CAN-BUS 控制器局域网通信；短路电流采用罗氏线圈进行采集，且设计电流处 理电路，并给出 2812AD 采样校正办法；最后给出触头系统磨损量在线监测软件流程 和设计时应注意的关键技术。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：本文采用 Matlab 软件的动态仿真工具 Simulink 及其电力系统工具箱 PSB 对小电流接地系统进行故障仿真，论述了模型的搭建步骤。主要分析了接地类故障零 序电压、零序电流的波形特征；分析了两相短路、三相短路短路电流的波形特征；分 析了两相接地短路系统零序分量以及故障相电压的波形特征。对系统的主要故障线路 始端以及故障区段两端波形进行仿真，观察波形更易于识别各故障的主要特征，了解 不同故障波形特征的差异，进而便于后续故障检测以及故障识别的研究，为小电流接 地系统故障规律分析提供了依据，对于小电流接地系统故障检测算法与检测设备的研 制具有重要意义。
Subjects: Mechanical Engineering >> Other Disciplines of Mechanical Engineering submitted time 2018-06-15 Cooperative journals: 《电气工程学报》
Abstract： Vacuum circuit breakers (VCBs) are widely used in power systems to control and protect power lines and power equipments under the conditions of normal, overload, short circuit and other faults. Once a VCB is unable to interrupt or make a current as designed, especially for the short circuit current, heavy losses would be brought about to both the power system and the consumers. In order to reduce the number of accidents and prevent possible troubles due to the failures of VCBs, one valid way is to monitor their performance and condition on-line. Based on the understanding and development of condition based maintenance (CBM) of high-voltage circuit breakers, the authors give some general introduction to electrical endurance on-line condition monitor for VCBs, in which the stress put on the non-intrusive method and device for determination of the arcing duration. The principle and configuration for arcing duration detect are emphatically expounded in our research, in which the electromagnetic induction theory is adopted for the arcing initialization and duration detect. The simulation and experimental results of the arcing detect device are provided in detail. The accuracy and stability of the arcing detect device have been demonstrated and it can distinguish co-existing arc signals in three-phase of circuit breakers. In the end, an algorithm for the electrical endurance of vacuum circuit breakers on-line condition monitoring system is proposed, which based on TMS320F2812 one type of DSP281X series produced by texas instruments semiconductor. The universally accepted approach of accumulative breaking current of high voltage circuit breaker contact to diagnose electrical endurance is used in the high-voltage circuit breakers electrical endurance on-line monitor system.
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