随着采用电力牵引的同时,电力机车由电气化铁道的接触网获得的廉价电能也开始供给旅客列车的照明、采暖和其它装置使用。首批制成的用电气采暖客车,曾研究和试验了由车下供电主线供给车内的照明器、辅助电动机和其它负载的设备。由于这个原因,十分迫切地提出建立经济的旅客列车集中供电系统的问题。在目前,提出的这个问题虽已曾作过若干研究,但由于有着大量的错综复杂因素,故要找到旅客列车最合理的供电还是十分困难。因此,在评价现有的系统时,必须仔细地研究每一供电方案的所有技术上的和经济上的优缺点。对于新的列车集中供电系统,首先要提出最大 Along with the electric traction, low-cost electric power obtained from the catenary of the electrified railway also begins to be supplied to the lighting, heating and other installations of passenger trains. The first batch of electric heating buses that were made were studied and tested on luminaires, auxiliary motors and other load-carrying equipment that were supplied to the car from the main power supply under the car. For this reason, it is very urgent to put forward the issue of establishing a centralized power supply system for passenger trains in economy. At present, although some studies have been made on this issue, due to the large number of complicated factors, it is still very difficult to find the most reasonable power supply for passenger trains. Therefore, when evaluating existing systems, all the technical and economic advantages and disadvantages of each power supply must be carefully examined. For the new train centralized power supply system, we must first propose the maximum