This paper first analyzes the common faults of SS4B type electric locomotive main circuit breaker, then puts forward the common diagnostic methods, and analyzes the insulation fault of circuit breaker, and finally stu...This paper first analyzes the common faults of SS4B type electric locomotive main circuit breaker, then puts forward the common diagnostic methods, and analyzes the insulation fault of circuit breaker, and finally studies the main methods to deal with the main circuit breaker fault.展开更多
柔性光学电流互感器(flexible optical current transformer,FOCT)在水电领域的推广应用,为奇数多分支发电机主保护定量化改造奠定了基础。经内部故障的全面分析计算,某每相7分支的大型发电机主保护定量化设计结果推荐采用“3-1-3”分...柔性光学电流互感器(flexible optical current transformer,FOCT)在水电领域的推广应用,为奇数多分支发电机主保护定量化改造奠定了基础。经内部故障的全面分析计算,某每相7分支的大型发电机主保护定量化设计结果推荐采用“3-1-3”分支分组方式,相应的主保护配置方案保护死区虽小(0.5%)但对相间短路存在保护死区——发生在每相未装设分支电流互感器(TA)的第4分支之间,利用柔性光学TA绕制灵活的特点,通过增设每相第4分支的光学TA及对应的不完全纵差保护即可消除上述相间短路保护死区。上述主保护定量化改造思路将为后续奇数多分支大型发电机的技术改造提供借鉴。展开更多
In order to reduce the starting wind speed of the wind wheel and improve the efficiency of the wind wheel, this paper proposes a new type of composite magnetic circuit permanent magnet generator, which changes the rel...In order to reduce the starting wind speed of the wind wheel and improve the efficiency of the wind wheel, this paper proposes a new type of composite magnetic circuit permanent magnet generator, which changes the relationship between the magnetic induction intensity and the air gap by changing the structure of the main magnetic circuit. The structure greatly improves the air gap sensitivity of the generator, which makes the structural design of the permanent magnet generator easier to implement. Finally, the effectiveness and feasibility of the method are verified by simulation.展开更多
当直流母线电压发生扰动或者阻性负载和阻感负载出现突加和突卸时,中频电源易出现不稳定、鲁棒性差等现象,使得输出电压效果不理想。为此,提出数字信号处理技术(Digital Signal Process,DSP)应用下串联式中频电源鲁棒性能改进方法。在...当直流母线电压发生扰动或者阻性负载和阻感负载出现突加和突卸时,中频电源易出现不稳定、鲁棒性差等现象,使得输出电压效果不理想。为此,提出数字信号处理技术(Digital Signal Process,DSP)应用下串联式中频电源鲁棒性能改进方法。在明确基于DSP的串联式中频电源主电路拓扑结构,利用混合灵敏度方法建立中频电源控制器,选取合适的加权函数,提高中频电源的跟踪能力,消除其中不确定因素,实现鲁棒性能的提升。实验结果表明,经由所提方法控制后,串联式中频电源的输出电压波形整体较为稳定,没有发生较为突出的波动,整体电源总谐波失真值小,具有优秀的稳定性和鲁棒性。展开更多
文摘This paper first analyzes the common faults of SS4B type electric locomotive main circuit breaker, then puts forward the common diagnostic methods, and analyzes the insulation fault of circuit breaker, and finally studies the main methods to deal with the main circuit breaker fault.
文摘柔性光学电流互感器(flexible optical current transformer,FOCT)在水电领域的推广应用,为奇数多分支发电机主保护定量化改造奠定了基础。经内部故障的全面分析计算,某每相7分支的大型发电机主保护定量化设计结果推荐采用“3-1-3”分支分组方式,相应的主保护配置方案保护死区虽小(0.5%)但对相间短路存在保护死区——发生在每相未装设分支电流互感器(TA)的第4分支之间,利用柔性光学TA绕制灵活的特点,通过增设每相第4分支的光学TA及对应的不完全纵差保护即可消除上述相间短路保护死区。上述主保护定量化改造思路将为后续奇数多分支大型发电机的技术改造提供借鉴。
文摘In order to reduce the starting wind speed of the wind wheel and improve the efficiency of the wind wheel, this paper proposes a new type of composite magnetic circuit permanent magnet generator, which changes the relationship between the magnetic induction intensity and the air gap by changing the structure of the main magnetic circuit. The structure greatly improves the air gap sensitivity of the generator, which makes the structural design of the permanent magnet generator easier to implement. Finally, the effectiveness and feasibility of the method are verified by simulation.
文摘当直流母线电压发生扰动或者阻性负载和阻感负载出现突加和突卸时,中频电源易出现不稳定、鲁棒性差等现象,使得输出电压效果不理想。为此,提出数字信号处理技术(Digital Signal Process,DSP)应用下串联式中频电源鲁棒性能改进方法。在明确基于DSP的串联式中频电源主电路拓扑结构,利用混合灵敏度方法建立中频电源控制器,选取合适的加权函数,提高中频电源的跟踪能力,消除其中不确定因素,实现鲁棒性能的提升。实验结果表明,经由所提方法控制后,串联式中频电源的输出电压波形整体较为稳定,没有发生较为突出的波动,整体电源总谐波失真值小,具有优秀的稳定性和鲁棒性。
