机车过关节式电分相时的过电压原因分析

Analysis of Over-voltages of Electric Locomotive Passing the Articulated Phase Insulator

当机车过锚段关节式电分相时,可能会产生过电压现象,严重时会危及牵引变电所的设备安全,也会威胁牵引变电所和接触网的安全运行。文章利用MATLAB/Simulink仿真软件建立机车过关节式电分相的仿真模型,然后针对机车进入电分相时不同接触网电压相位角、电分相装置的位置和牵引网高次谐波的含量对中性线电压的影响进行仿真分析,并对中性线上产生的过电压波形进行傅里叶分析。结果表明,这几个因素均是影响中性线电压峰值的主要原因。

Over-voltages frequently happen when the electric locomotive passes the articulated phase insulator, which causes trip-ping of substations and serious influence on safe operations of the overhead contact system and traction substations. In this paper, the simulation model of electric locomotive passing the articulated phase insulator was established in MATLAB/Simulink IDE . The simula-tion analysis was made for several important reasons that lead to excessive overvoltage, which include the different phase angle of the contact network, the position of electrical phase separation device, and the contact of higher harmonic. The Fourier analysis of overvolt-age waveforms generated on neutral line was made. It is confirmed that these factors are the main factors affecting the peak of neutral line voltage.