论文部分内容阅读
欧洲早在18世纪末期就有了电气化铁路,1879年首次成功地在柏林表演了载人的电气车辆。在两次世界大战当中有了发展,起初是在城市近郊、山区线路和运量大的干线上实行电气化,因为这在经济上和运营上都很有利。早期电气化线路是直流供电的,电压从600伏到3,000伏,在沿线设变电所,变交流工频用电为直流牵引用电。当时有的国家也曾采用交流低压供电系统,但为了消除对通信干扰,选用低频,因此需专设低频发电厂(或变频站)。这显然是不经济的。
As early as the late eighteenth century, Europe had an electrified railway, and for the first time in 1879, it successfully performed manned electric vehicles in Berlin. Developed during the two world wars, electrification was initially carried out on the outskirts of cities, on mountainous routes and on heavy traffic lines, as it was economically and operationally favorable. Early electrification line is DC power supply, voltage from 600 volts to 3,000 volts, located along the substation, variable AC power frequency for the DC traction electricity. At that time, some countries also used AC low-voltage power supply systems. However, in order to eliminate interference to communications, low-frequency power was used. Therefore, a low-frequency power plant (or substation) should be set up. This is clearly uneconomical.