环网中同杆双回线任意故障的精确计算

同杆双回线在环网状态下的故障计算时常常无法得到精确的两端系统阻抗造成故障计算困难.本文介绍在这种状态下同杆双回线任意故障形式故障(包括纵向,横向和多处故障)的精确计算方法.采用了精确的分布参数模型和特征模量分析方法,将分布电容和线路换位的影响计算在内从而精确地计算同杆双回线任意故障下的工频电量.文中以跨线并接地的横向故障和接地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.

Accurate calculation for random faults of double circuit line on loop net

On loop power net, it is hard to obtain the system impedances at both sides of double circuit line that makes fault calculation difficult. An accurate calculation method for random faults of double circuit line on loop net is introduced. By a precise model of distributed parameters and eigenanalysis method, 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 power lines on the same tower. With an example of two lines short and grounding fault,and one side of breaker of grounding fault line being cut off, the paper illustrates the principle of this calculation method.