超高压同杆双回线任意故障的直接精确计算

为解决同杆双回线任意故障形式故障(包括纵向、横向和多处故障)的精确计算问题,采用了精确的分布参数模型和特征模量分解方法,将分布电容和线路换位的影响计算在内从而精确计算同杆双回线任意故障下的工频电量。以跨线并接地的横向故障和该故障线的一侧断路器断开后的复杂故障为例阐明了该算法的原理。两个a相接地同时m侧a相断路器断开的复杂故障的算例:其中一个是无负荷电流时的故障,另一个是有负荷电流时的故障,证明该方法是正确的。将计算结果与ATP-EMTP仿真比较,证明了方法的正确性。

Accurate Calculation for Random Faults of EHV Double Circuit Lines

An accurate calculate method is introduce to accurately calculate random faults of double circuit power lines on the same tower. By eigenanalysis method and precise model of distributed parameter, considering the effects of power line transposing and distributed capacitance, the calculation method can precisely get random fault (including crossing lines faults and complex faults) results of double circuit lines on the same tower. By example of two lines shorting and grounding fault with one side of breaker of this line cut off, the principle of this calculation method is illuminated. There are two complex fault calculation examples, one is a phase line grounding and one side of this line breaker cut off without load current, another is the same fault with load current. Comparing the calculation results and ATP-EMTP simulation results proofs the validity of this method.