电缆-架空线混合输电线路的故障暂态行波具有复杂多变的传播特性.通过理论分析和仿真验证,深入研究电缆-架空线混合线路故障暂态行波的产生机理及传播特性.并基于此阐明混合线路的单双端组合行波测距原理,详细探究了过渡电阻、故障初始相角、故障类型、故障距离对混合输电线路故障电压行波、电流行波的传播特性及组合行波测距精度的影响.同时计算分析了电缆金属屏蔽层单端接地线上的故障电流随故障距离的变化关系.过渡电阻、故障初始相角、故障类型对220 kV电缆-架空线混合线路的故障电压行波、电流行波幅值有显著影响,但对行波的第一个波头到达线路两端所需时间无影响.不同故障位置下,混合线路故障行波的幅值及第一个波头到达两端所需时间不同.电缆金属屏蔽层采用单端接地方式时,电流行波幅值随电缆故障距离增大呈非线性单调递减的特性.%Fault transient traveling wave of cable and overhead line hybrid transmission line has the characteristics of complex and variable propagation. To this end, this paper uses theoretical analysis and simulation verification to do the research of the mechanism of production and propagation characteristics of fault transient traveling wave of cable and overhead line hybrid line in depth. On this basis, the principle of single line traveling wave distance measuring principle for hybrid line is expounded and the influence of transition resistance, fault inception angle, fault type, fault position on the fault voltage traveling wave, current traveling wave propagation characteristics and combined traveling wave fault location precision is explored in detail. At the same time, the relationship between the fault current and the fault distance of cable-metal shielding layer single-terminal grounded line is calculated and analyzed. The transition resistance, initial phase angle, fault type have a significant impact on fault voltage traveling wave and current traveling wave amplitude of 220 kV cable-overhead-line hybrid line, but they have no effect on the time required to reach the first wave of the traveling wave;under different fault location, the time that the amplitude of fault traveling wave of hybrid line and initial row wave surge reach both sides of the line is different; the current traveling wave amplitude of the single end ground wire of the cable metal shield decreases with the increase of the cable part fault distance, that is nonlinear monotone decreasing characteristic.
展开▼
