基于概率的机车过分相过电压仿真实测及其机理研究

Research on Simulation, Practical Measurement and Mechanism of Locomotive Over-voltage and Passing Neutral-section Based on Probability

分析了不同变压器接线方式下所产生的两供电臂电压相位差对关节式过分相感应电压大小的影响;并通过仿真模拟机车进入和离开中性段时所产生的操作过电压;中性段上可能由于操作过电压激发铁磁谐振,铁磁谐振情况下右侧供电臂通过受电弓接入中性段所产生的操作过电压是造成放电间隙击穿的主要原因;用实测和仿真结果证实了分析结果。指出通过装设谐振抑制装置可以将操作过电压限制在可接受范围内,避免引起变电所跳闸。

This paper analyzes the influence of different voltage phase angle of two power supplied arm varied with transformer connections on the induced voltage value on the articulated passing neutral section. Switching over-voltage has been obtained by simulating locomotive getting into and out of the neutral section.The switching over-voltage in neutral section may cause ferroresonance. The right power supplied arm connected to the neutral section by pantograph under condition of ferroresonance is the main reason that leads to breakdown discharge gap. The paper testifies the analytical result by practical measurement and simulation.It points out that switching over-voltage can be limited in an acceptable scope to avoid substation tripping by adding suppressing ferroresonance device.