2014.04.05【英译中】交流发电机①

猫四狗八 (ho) 路人甲
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发表于:2014-04-05 19:23 [只看楼主] [划词开启]

Alternating Current Generator

 交流发电机


1. The complete electrical plant on board ship is made up of power generation equipment, a distribution system and many power utilizing devices. Electricity is used for the motor drive of many auxiliaries and also for deck machinery, lighting, ventilation and air conditioning equipment. Alternating current because of its important advantages has now all but replaced direct current as the standard supply for all marine installations.

1 完整的船用电力设备是由发电设备,配点系统和用电设备组成的。电力是用于辅机,甲板机械和照明,通风,空调系统的驱动。由于交流电的优势,现如今几乎已经完全取代了直流电从而作为船用装置的标准电源。

 

2 A coil of wire rotating in a magnetic field produce a current. The current can be brought out to two slip rings which are insulated from the shaft. Carbon brushes rest on these rings as they rotate and collect the current for use in an external circuit. Current collected in this way will be alternating, that is, changing in direction and rising and falling in value. To increase the current produced, additional sets of poles may be introduced.

2 线圈在磁场中旋转产生电流。产生的电流又传递到与曲轴绝缘的滑环上。电刷放置在滑环上,当滑环旋转就会收集供给外部电路的电流。这样的电流就是交流电,就是指方向和大小都改变的电流。为了得到大的电流就需要引进额外的磁极。


3. The magnetic field is provided by electromagnets so arranged that adjacent poles have opposite polarity. These “field coils”, as they are called, are connected in series to an external source or the machine output.

 3 磁场由布置着相邻磁性相反磁极的电磁铁产生。这些磁场线圈是串联在外部电流和机械输出上的。


 

4. The magnetic coils or conductors are used, and then several outputs can be obtained. Three outputs are usually arranged with a phase separation of 120°, to produce a three-phase supply. The three-phase system is more efficient in that for the same mechanical power, a greater total electrical output is obtained. Each of the three outputs many be used in single-phase supplies or in conjunction for a three-phase supply. The separate supplies are connected in either star or delta formation. The star formation is most commonly used and requires four slip rings on the alternator. The three conductors are joined at a common slip ring and also have their individual slip rings. The central or neutral line is common to each phase. The delta arrangement has two phases joined at each of the three slip rings on the alternator. A single-phase supply can be taken from any two slip rings.

 4 如果使用分立的线圈或导线,那么就能得到多个输出。三相输出通常有120度的相位角,从而产生三相电供应。输入相同的机械功,三相电系统能获得更大的输出,所以它的效率更高。每一相输出都能作为单独的电力供应,也能结合起来作为三相电源。单相电供应用星形或三角形连接。星形连接应用最广,并要求发电机有4个滑环。三条导线结在同一个同一个滑环上,也有它们各自的滑环。每一相共用一条中性线。  交流发电机上三角形连接每两相结在三个中的一个滑环上。单相电源可以由任意两个滑环产生。



最后编辑于:2014-04-05 19:35
分类: 英语
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