选用直流供电时，注意正负极标识。
During choose the direct current power supply, pay attention to the negative and positive.
介绍EH200型直流供电电力机车的开发。
The development of EH200 type DC electric locomotive is introduced in this paper.
直流断路器是直流供电系统中极其重要的保护设备。
DC circuit breakers are the most important protection equipments for DC power system.
变压器出现后，许多负荷由交流供电而不用直流供电。
After the Advent of transformers, much of the load was served by alternating current instead of direct current.
希望你现在明白为什么有两种不同类型的电容器在直流供电线路。
Hope you are now understand why there are two different types of capacitors in the DC supply line.
城市轨道交通的供电系统一般采用直流供电，并以轨道作为回流的通路。
In DC rail transit systems, the running rails are usually used as the return conductor for traction current.
地铁直流供电的保护与控制系统对确保地铁的安全可靠运行起着关键作用。
The protection and control system in subway DC power supply systems play a key role in ensuring the safety and reliability of the subway.
该产品防水性能好，使用低压直流供电安全方便，发光颜色多样，色彩绚丽。
It is waterproof; low voltage and directly current supply for using conveniently, safely; irradiance color is various and attractive.
混凝土泵电气系统采用可编程序控制器编程控制，系统采用24V直流供电；
PLC and 24V direct-current supply are adopted in the electrical system of concrete pumps.
蓄电池在放电后及时而充分地恢复其容量是实现通信设备直流供电不间断的关键。
Timely and fully recovering the capacity of lead acid battery after discharge is the crux of uninterruptable DC power supply for telecommunications.
提出一种采用节能型荧光灯的应急照明设计方案，并给出了相应的直流供电线路。
This paper proposed a design of emergency lighting in which the economical fluorescent lamp is used. The electronic circuit of emergency lamp which supplies DC power is given.
摘要：在同工况条件下，测定了脉冲供电和直流供电的伏安特性曲线和除尘效率。
Abstract: Under the same working condition, the volt ampere characteristic curve and the dust removal efficiency of the pulse power supply and DC power supply are determined.
由于直流供电电源纹波的影响，电压控制SPWM逆变电路的输出谐波分量幅值较大。
Because of the ripple of the DC power supply, the output harmonic amplitude of the voltage controlled SPWM inverter is higher.
直流供电的控制和保护系统对确保轨道交通的安全、可靠的运行，具有举足轻重的作用。
The control and protection system in DC power distribution systems plays a very important role in ensuring the mass transit railway safe and reliable operation.
对负脉冲供电、正脉冲供电和直流供电情况下，H2S消除效率及能量利用率进行了比较。
The H2S removal efficiency and power utilization efficiency were compared in the cases of negatively pulsed voltage, positively pulsed voltage and DC voltage.
就电源而言，灯丝用交、直流供电均可，但是版本二中的3a5除外，它必须用直流供电。
About the power supply, the filaments can be powered by AC or DC except that the 3a5 (version 2 of the amplifier) requires a DC filament supply.
针对电解技术中直流供电环节进行节能优化研究，以期降低整流机组功率损耗，提高整流效率。
The research on the optimization of energy saving of the dc power supply in the aluminum electrolysis industry is studied.
论文采用直流斩波原理，利用体积小、重量轻、效率高、可靠性好的开关电源作为直流供电电源。
With chopping principle, switching power supply is chosen as the DC power supply because of its small size, low weight and high efficiency.
电源电路包括：射频信号发生电路、射频功率放大电路、直流供电电路和附加保护电路，以及与激光头的匹配网络。
The power circuit is composed of following circuits: RF oscillator, RF power amplifier, DC supply power circuit, protection circuit and matching network.
文中介绍了通信基站的电源系统，包括交流供电系统、直流供电系统和接地系统，论述了等电位在基站建设中的重要性。
In the paper, an electrical power system of base station is introduced in detail, including AC power supply system, DC power supply system and earthing system.
在50伏特直流电供电情况下，其最小增益为9.0dB，而最低集电极效率为40%（>45%的典型值）。
It is designed to have a minimum gain of 9.0 dB with 40 percent minimum collector efficiency (>45 percent typical) on a 50VDC supply.
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.
这个船坞能供电的最大功率是多少？有直流电源吗？
What's the maximum power the dock can supply? Is there any source of direct current?
低惯量的直流传动电动机由快速可控硅装置供电。
The low inertia DC drive motor is supplied by a quick thyristor unit.
主要是提供电磁铁的直流电源及完成(吸、放料)控制要求。
The main purpose is to provide DC power supply and complete (suction, discharge) control requirements.
为保证直流操作电源供电的可靠性，必须对蓄电池组运行参数进行全面的监测。
To warrant reliability of DC operation power electrical supply, all-round monitoring to parameter of storage battery operation is necessary.
安全；采用低压直流12V供电电压，因此使用上非常安全。
为能向220VAC的电器提供电能，需要将太阳能发电系统所发出的直流电能转换成交流电能，因此需要使用DC-AC逆变器。
To be able to provide 220VAC electrical power, solar power generation system needs to be issued by the exchange of DC can be converted into electrical energy, so need to use the DC-AC inverter.
介绍了地铁直流牵引供电系统框架泄漏保护的优化设计方案。
This paper mainly introduces an optimum design scheme for the frame leakage current protection of DC traction power supply system in metro engineering.
介绍了地铁直流牵引供电系统框架泄漏保护的优化设计方案。
This paper mainly introduces an optimum design scheme for the frame leakage current protection of DC traction power supply system in metro engineering.
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