摘要
非对称短路电流波形是交流断路器型式试验中应用非常广泛的典型电流波形。由于大功率试验站短路电流交流分量的衰减时间常数随着短路发电机暂态过程会发生变化,使得读取非对称短路电流的交流分量和直流分量变得困难。通过在短路电流每个半波内构造方程求解短路电流的表达式,并计算出短路电流每个半波的初始相位、直流时间常数和交流分量幅值,实现了非对称短路电流直流分量和交流分量特征参数的动态计算。通过4组典型的短路电流波形测试,可见所提的半波法计算交流分量幅值的偏差在0.5%以内,而三峰值法的最大偏差为4.96%。结论表明,方法可以很好地解决三峰值法在第一个半波和最后一个半波计算交流分量幅值和直流分量误差较大的不足。
Asymmetric short-circuit current waveform is a very widely used typical current waveform in circuit-breaker type test.Because the decay time constant of AC component is changed with the transient process of short-circuit generator,it is difficult to read the AC component and DC component of the asymmetrical short-circuit current.In this paper,the expression of short circuit current is solved by the construction equation in each half wave of the short-circuit current.Furthermore,the initial phase,time constant and AC component amplitude of each half wave are calculated by the solved expression,which realizes the dynamic calculation of the characteristic parameters of the DC component and AC component.Finally,the calculation method is tested and evaluated through four typical ideal waveform data,and the deviation of the calculated amplitude of AC component is less than 0.5% based on the proposed method,while the maximum deviation of the three-peak method is 4.96%.The conclusion shows the proposed method can well solve the shortcomings of the three-peak method in calculating the magnitude of AC component and DC component in the first half-wave and the last half-wave of asymmetrical short-circuit current.
作者
蔡梦怡
杨为
贾转转
张国宝
赵恒阳
CAI Mengyi;YANG Wei;JIA Zhuanzhuan;ZHANG Guobao;ZHAO Hengyang(State Grid Anhui Electric Power Research Institute,Hefei 230022,China;Xi’an High Voltage Apparatus Research Institute,Xi'an 710077,China)
出处
《电器与能效管理技术》
2019年第11期52-56,76,共6页
Electrical & Energy Management Technology
关键词
短路发电机
非对称短路电流
交流分量
直流分量
时间常数
short-circuit generator
asymmetrical short-circuit current
AC component
DC component
time constant
