《世界电力机车的发展中英文翻译/外文翻译应用电子技术外文文献翻译》由会员分享，可在线阅读，更多相关《世界电力机车的发展中英文翻译/外文翻译应用电子技术外文文献翻译（8页珍藏版）》请在金锄头文库上搜索。
1、外文原文：The Development of World Electric LocomotiveElectric locomotive itself with the original motive accept catenary sent by the current as a source of energy, from locomotive traction motor drive the wheels. With electric locomotive power, thermal efficiency, fast, strong and reliable operation Guo
2、zainaili major advantages, but do not pollute the environment, and particularly applicable to the busy railway transportation and tunnels, the slope of the mountain railway. Electric locomotive from the contact line access to electricity, catenary power supply current locomotives are both DC and AC.
3、 The current system different, not with the electric locomotive, can be divided into basically straight-DC electric locomotive, the TAC-DC electric locomotive, the TAC-Direct-AC electric locomotive three. Straight-DC electric locomotive using DC power supply system, traction substation equipped with
4、 rectifier devices, it will become a three-phase AC DC, and then to access the Internet. Therefore, the electric locomotive can be made online directly from the contact supply DC Series traction motor use, which simplifies the locomotive equipment. DC systems weaknesses are catenary low voltage, typ
5、ically l500V or 3000 V, the contact wire request is rough, it is necessary to consume a large amount of non-ferrous metals, and increased construction investment. TAC - DC electric locomotive powered by AC system, most of the worlds countries use the frequency (50Hz) exchange system, or 25 Hz low-fr
6、equency communication system. In this supply system, traction substation will be changed to three-phase alternating current frequency of 25 kV single-phase AC power industry after exposure to the Internet. But in the electric locomotive used on the string is still DC motor (which is the biggest adva
7、ntage motor speed as simple as changing motor terminal voltage, it should be easy to achieve in the larger context of the locomotive speed, but such Motor due to the commutator, manufacturing and maintenance are very complex, and also greater volume), the AC into DC locomotive in the task completed.
8、 The catenary system DC voltage than to raise a lot of contact wire diameter can be relatively reduced, reducing the consumption of non-ferrous metals and construction investment did not. Therefore, the frequency communication system has been widely adopted by majority of the worlds electric locomot
9、ive also pay - DC electric locomotive. TAC-Direct-exchange by exchange of non-electric locomotive traction motor commutator (that is, three-phase asynchronous motors),which is in the motor manufacturing, performance, functionality, size, weight, cost, maintenance and reliability and so on than the m
10、otor commutator much easier. It is the failure of the electric locomotive, is the main reason for speed rather difficult. This locomotive has excellent traction capacity promising. German-made electric locomotive E120 This is the locomotive. The working principle of electric locomotive, the current
11、contact wire, and withstand electric locomotive into the arch after re-entering the circuit breaker after the main transformer, AC traction from the main transformer winding through silicon rectifier units, divided into two groups of six parallel to the traction motor DC supply concentrate to a trac
12、tion motor torque, the mechanical energy into electric energy through the transmission gear-driven locomotive drive wheels turning. The development of electric locomotives: The first to create the first standard gauge electric locomotive is the Scots R Davidson, time is 1842. May 1879, the German Si
13、emens W V design and manufacture of a 18 - to pull on the three open passenger electric locomotive, this is the first electric locomotive successful pilot. 1881, Paris, France at the first of electricity from overhead wires tram lines, which for the upgrade, using high-power traction motors to creat
14、e the conditions: 1895, the United States in Baltimore - Ohio between 5.6 km long tunnel section DC electrified railway construction. 1903 Germanys three-phase AC electric locomotive created a 210 km per hour high-speed recording. Electric locomotive of development depends on the development of elec
15、trified railway. Build a real sense electrified railway is first necessary to resolve how to provide high-voltage, change standard power supply problems. Catenary locomotive current supply system, divided into DC system and the exchange of two (AC system in the single-phase AC again, three-phase AC)
16、, which called power supply standard. The frequency of the single-phase AC system to promote the development of electrified railway. 20 in the early 1970s, continental Europe and Japan in Asia is basically realized transport busy main railway electrification. 1973 1974 outbreak of the oil crisis, the national electricity and internal combustion of the railway traction re-evaluation of the economic, favored by the more electric tra
