全并联AT供电网络的电气特性分析及其故障测距方法的研究

全并联AT供电方式是我国高速铁路发展的主要供电形式.本文分析了全并联AT牵引网的电流分布规律和牵引网阻抗特性,并在全并联AT短路故障电流分布规律的基础上提出了适合于全并联AT的故障测距原理.仿真了电流分布规律和阻抗特性.结果表明,其特性曲线和实际的相符合,从而证明了牵引网模型的精确性.仿真了AT漏抗、上下行互感和钢轨漏导对故障测量精度的影响.结果证明这些因素对故障测距精度不会产生影响.

Analysis of Electrical Specification of All-parallel AT Traction Supply System and the Study of Its Fault Location Methods

All-parallel AT power supply is the main style in the future development of the high-speed railway in China. The article analyzes the current distributing regularity and the traction impedance character of the all-parallel AT traction system and gives a fault location principle suitable for it on the base of its fault current distributing regularity. The current distributing regularity and impedance character were simulated. The result improves the precision of the traction system model. The influence of AT leakage reactance, ascending-descending mutual-inductance and the reciprocal of rail-to-ground leakage on fault measure precision were also simulated, and the results improved that there is no influence to the precision by these factors.