选择交流电作为工业标准的原因很简单，在早期供电距离很短的电网里，交流电的损耗比直流电小。
The reason was that over the short distances spanned by early power grids, AC transmission suffers lower losses than DC. It thus became the industry standard.
由于在传输过程中采用高压直流电缆输送的损耗要比传统交流电的损耗小得多，因此采用交流电远距离传送电力很不划算。
Energy losses on DC lines are far lower than on the traditional AC ones, which make transmission of energy over long distances uneconomic.
交流电与直流电的不同之处在于交流电不断地改变其电流流动方向。
Alternating current is different from direct current in that it constantly changes its direct of flow.
在连接交流电源之前，请验证交流电压、相位和频率是否与控制装置外壳门参数板上的相应数据相同。
Verify ac line voltage phase and frequency with the controller data plate on the enclosure door prior to connecting ac power.
比起交流输电和本地发电，轻型高压直流输电系统不仅具有成本优势，它也对提高交流电网电能质量提供了新的途径。
Compared to the ac Transmission and local power generation, HVDC light system is not only cost advantages, it also exchanges to enhance ac power quality for a new approach.
对于交流电压测量﹐利用有效值转换电路或精密整流器电路将交流信号转换成直流电压。
For AC voltage measurement, an RMS converter circuit or a precision rectifier circuit convert the AC signal into a DC voltage.
电瓶充电器，用交流电向飞机内电瓶充电的电气装置。带有交流电的电气装置，该装置产生直流电向飞机上的电瓶充电。
Battery CHARGER, an electrical device supplied with alternating current, which produces a direct current output for charging the battery on the airplane.
请记住，什么是上面显示的范围，是交流电，直接的交流发电机。
Keep in mind, what is shown above on the scope, is Alternating Current, directly out of the alternator.
AC适配器(这是交流电源更准确的说法)只是把来自墙上插口的交流电转化为低伏特、低安培的直流电源，并通过USB接口充入手机。
The ac adapter (as it's more accurately known) simply converts the ac current from a wall outlet into low-voltage, low-amperage DC current that it provides via a USB port.
户用型光伏发电系统是通过光伏电池将太阳能转化为电能，一部分电通过逆变器将直流电变为与交流电，给交流负载（包括电视机，电冰箱等）工作；
The independent photolatic power generation transforms solar energy into electric through the solar panels. One part was transformed to the AC load, such as television, refrigerator and so on.
提出并设计了一种有机电致发光显示器交流电压驱动电路，在验证此电路性能的同时也对有机电致发光显示器在交流驱动下的特性进行了测试。
The relevant test and research show that the AC-driving circuit functions excellently, realizing AC driving and restraining the cross talk, and the lifetime of OLED can be improved greatly.
阐述了CBBFJ型金属化聚丙烯膜交流电容器交流声产生的根源，深入分析了其形成机理，并探讨了有效的解决途径。
Expound the source of generating ac noise of CBBFJ metallized film capacitor. Analyze the mechanism. Probe into the effective measures.
本文介绍交流电桥平衡条件和一种快速调节交流电桥平衡的方法，对初学者大有益处。
This paper presents balanced condition of ac bridge anda kind of fact-adjusting method on ac bridge balance which in a effective method while being applied for teaching.
在计算电缆群载流量时，交流电阻是一个重要的参数，其中邻近效应是计算交流电阻的一部分。
Ac resistance of cable conductor is an important factor to calculate the ampacity of cable bundles, and proximity effect factor is an important parameter to affect ac resistance.
该方法就是在恒定交流鼠笼异步电动机之间接入晶闸管作为交流电压控制器。
The method is in a constant exchange between the squirrel cage induction motor access SCR as AC voltage controller.
必须查看本机交流电压选择器之预调状态是否符合本地交流电压。
Selector Setting should be checked to see that it conforms to the local AC supply voltage.
分析了PWM双桥叠加型，交流斩波型和串联型等三种变频型交流电压调节电路，介绍了基于变频技术的调压应用。
This paper analyzes PWM double-bridge superposition regulator, AC chopping regulator and series voltage regulator, and introduces the application of AC voltage regulating based on VF technologies.
在矢量控制交流感应电动机数学模型的基础上，采用阶跃电压和阶跃电流的方法实现了对交流电机电气参数的静态检测。
On the basis of mathematical model of AC induction motor in vector control inverter the static measurement of electrical parameters for AC motor is completed using pulse voltage and pulse current.
示零器电路改进后的交流电桥，增大了示零器电路的内阻，提高了交流电桥的灵敏度，对任何形式的电容电桥、电感电桥都适用。
The increased internal resistance within an improved zero indicator helps increase the sensitivity of the AC bridge and thus can be available for any type of capacity bridge and induction bridge.
基于DSP的电动汽车用交流电机的直接转矩控制是电机高性能交流变频调速的新技术之一。
Direct Torque Control (DTC) of induction motor based on DSP is new technology of high performance AC — frequency conversion — rate of regulation.
该电源输入单一交流电压和频率，内部经过交流对直流；直流对交流的变流整流转换后，自行产生-非常稳定纯净的正弦波。
The single AC power input voltage frequency, the internal AC to DC after; DC converter rectifier exchange conversion, self-produced - very stable, pure sine wave.
交流变频调速系统是利用异步交流电动机的同步转速随频率变化的特性，通过改变电机的供电频率而进行调速。
Because the AC asynchronous motor 'synchronous speed is determined by the frequency, we can control the AC asynchronous motor' speed by changing the supply power's frequency.
根据交流感应电动机在两相静止坐标系上的数学模型，采用脉冲电流法、脉冲电压法实现了对交流电动机电气参数的静态测试。
On the basis of the mathematical model of AC induction motor in two phase axis system, the static measurement of electrical parameter for AC motor is completed using pulse voltage and pulse current.
逆变器是负责把直流电转换为交流电，保证交流电负载设备的正常使用。
Inverter is responsible for the direct current into alternating current, AC load equipment to ensure the normal use.
本文阐述了交流电动机软起动控制器的控制原理，与常规的交流电动机起动控制器相比所具有的优点和特点。
This article describes the control principle of soft starter of alternate current electric motor, and the excellence and characteristic than normal starter.
现代行车起重控制系统大多采用交流电机拖动，因此交流调速技术也被广泛应用。
AC motors are usually used in modern traveling crane control system, so the technology of AC speed regulation is also adopted widely.
作为参考的交流电机电动势与另一台交流电机或无限大母线电动势之间的相角差。
Phase difference between the e. m. f. of an alternator taken as a reference and that of another alternator or that of an infinite bus.
必须查看本机交流电压选择器之预调状态是否符合本地交流电压。
The voltage Selector Setting should be checked to see that it conforms to the local AC supply voltage.
变交流电为直流电或者变直流电为交流电的装置。
The AC output must therefore be rectified, or changed to dc.
综述交流电力线路对埋地管道交流干扰的危害，提出防止危害的几条措施。
The paper summarizes the effect of AC system on underground pipelines. Some measures on how to avoid its interference are put forward.
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