变结构支路短路电流计算的复合序网法模型研究

Study on compound sequence network model of short-circuit current calculation for variable structure branch

提出了一种适合于求流过变结构支路短路电流的复合序网法数学模型,将开关设备(如断路器等)用一条变结构支路模拟,应用短路故障复合序网分析法的基本原理,结合现有关于变结构变参数的短路故障分析方法,能够直接计算在开关设备两侧分别发生短路时,通过开关设备的短路电流。以A相作为参考相,分三相相间短路、两相相间短路、两相相间短路接地及单相短路接地等4种情况建立变结构支路短路电流复合序网法的数学模型。该模型物理意义清晰、建模简单,在短路故障计算机分析中应用前景广阔。

A compound sequence network mathematic model is proposed to figure out the short -circuit current through the variable structure branch,using a variable structure branch to simulate the switching equipment （such as breaker,etc.）. Applying the basic principle of the short-circuit fault compound sequence network analytical method and combined the short-circuit fault analytical method of variable structure and parameter,the short-circuit current through the switching equipment when short -circuit happens at one side of it can be calculated. With phase A as reference,its mathematics model is constructed for the three-phase short-circuit, two-phase short-circuit, two-phase grounding, single-phase grounding respectively. With clear physical meaning and easy modeling,the model has wide application prospects in the field of short-circuit fault analysis on computer.