摘要
基于短路电流的表达式,根据现有试验数据,推导了短路电流直流分量衰减时间常数的三种计算方法。分析不同方法的适用条件,并从直流分量、燃弧时间、最后电流半波参数、恢复电压和TRV参数计算等方面分析了直接试验中,不同直流分量时间常数对断路器短路电流开断性能的影响,并对标准规定时间常数参数进行量化。结果表明,系统时间常数越大,直流分量百分数越大且衰减越缓慢,燃弧窗口越长,电弧能量越大,电流过零息弧时di/dt与TRV有所降低。以某试品直接试验数据为算例搭建仿真模型,模拟12 kV/40 kA短路开断,仿真结果验证了文章对时间常数对短路开断影响分析方案的有效性及正确性,为直接短路试验提供了很好的理论参考依据。
Based on the expression of short-circuit current,according to the existing test data,three kinds of calculation methods of DC component of short circuit current decay time constant are derived.Analyzing the applicable conditions of different methods,and from the DC component,arcing time,final current half wave parameter,recovery voltage and TRV parameter,the influence of different DC component time constant on direct current short-circuit current interruption performance in direct test is analyzed,and the standard time constant parameter is quantified.The results show that the greater the time constant of the system is,the greater the percentage of the DC component is,and the slower the attenuation is,the longer the arc window is,the greater the energy of the arc is,when the current is zero,the di/dt and TRV are reduced.Taking a pilot test data as an example,a simulation model is built to simulate the 12 kV/40 kA short-circuit fault.The simulation results verify the validity and correctness of the time constant analysis scheme for short-circuit interruption,which provides a good theoretical reference for direct short-circuit test.
作者
胡勋
胡博
万媛
宇文博
陶群
HU Xun;HU Bo;WAN Yuan;YU Wenbo;TAO Qun(Xi’an High Voltage Apparatus Research Institute Co.,Ltd.,Xi’an 710077,China;Shanxi Qing Shuichuan Energy Co.,Ltd.,Xi’an 710075,China;Xi’an XD Electric Research Institute Co.,Ltd.,Xi’an 710075,China)
出处
《电气应用》
2019年第8期81-90,共10页
Electrotechnical Application
关键词
直流分量
时间常数
断路器
短路开断
DC component
time constant
circuit breaker
short circuit breaking
