The protection and control system in subway DC power supply systems play a key role in ensuring the safety and reliability of the subway.
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。
It describes the classification of DC power supply system and how to configure DC power supply system in different type telecommunication bureau.
介绍直流供电系统的分类及如何根据不同类型的通信局(站)配置相应的直流供电系统。
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.
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。
Working in a 600v DC power supply system, the type ZDB battery charger USES new power electronic insulated-gate bipolar transistors (IGBT) as switching device and adopts PWM control technics.
ZD B型直流电源变换器是工作在直流600v供电系统的变流装置。该装置以新颖电力器件IGBT作为开、关器件并采用PWM控制技术。
In 1998, it produced DC motor to drag piston compressor split type electric air conditioning system, solved the adaptability problem in complex trolleybus 's power supply system.
1998年，生产出直流电机拖动活塞式压缩机的分体式电车空调系统，成功解决了空调在复杂的乌龟电车点系统中的适应性问题。
High frequency switching power supply adopting soft switching technology, which has reliable high efficiency and long use time performances becomes the important part of DC power system.
基于软开关技术的高频开关电源因其性能可靠、效率高、寿命长等优点，成为了现代电力操作电源系统中的重要组成部分。
According to the design demand of DC power supply panel in engineering, this paper introduces the selection of rectification DC rectification power system with high-frequency switch.
针对工程中对直流电源屏的设计需要，简要介绍了高频开关整流电源直流系统的选择。
In the first chapter, studying the structure and running performance include the DC traction power supply and ac power supply system.
本篇论文第一章研究了城市铁路供电系统(包括直流牵引供电系统和交流供电系统)的构成和运行方式。
The abnormal failure of battery which works as the backup power supply for DC system when ac power failure occurs, will affect the safe operations of DC system seriously.
蓄电池作为直流系统交流停电时的后备电源，其非正常失效严重影响了直流系统的安全运行。
As backup power supply of the DC system, the residual capacity of battery effected safe operation of DC system directly when ac power failure occurs.
蓄电池作为直流系统交流停电时的后备电源，其剩余容量直接影响了直流系统的安全运行。
The hardware of remote control system for defensive military battlefield consists of Command and control unit, central unit, DC power supply and peripheral units.
防御性军事战地远程控制系统硬件由指控单元、中央单元、直流电源和外设单元组成。
The power button controls the DC power supply output to the system.
在电源按钮控制直流电源输出到系统中。
DC power supply is mainly provide constant voltage power supply for control circuit, driver circuit and a variety of protection circuits and allows the system to work properly.
直流稳压电源主要是用于对系统中的控制电路、驱动电路以及各种保护电路提供恒压电源，使得系统能够正常工作。
At present power converters of DC driving system make power supply outputs a high-frequency pulsating current, which is from zero to the armature current. This large ripple damages batteries.
目前国内外电动车直流驱动功率变换器使储能电源输出电流从零到电机电枢电流高频脉动，不利于延长动力电池的使用寿命。
With the rapid development of subway, it is necessary to consummate the protection for DC traction power supply system.
随着城市地铁的大力发展，研制更加完善的直流保护正是应时之需。
The DC operation power supply system is a kind of important equipment in substation.
直流操作电源系统是变电站中的重要设备。
The DC operation power supply system is a kind of important equipment in transformer substation.
直流操作电源系统是变电站中的重要设备。
Based on the power supply system on electric vehicle(EV) and the mathematical mode of brushless DC motor(BLDCM), a speed control system with bi-directional DC/DC converter was proposed.
在分析电动汽车电源系统和无刷直流电机数学模型的基础上，提出一种基于双向DC/DC变换器的无刷直流电机调速系统。
Setting up the simulating DC power supply net, designing and implementing basically the signal acquisition and processing system based on the computer control technique.
搭建了模拟直流电网，设计并初步实现了基于计算机控制的信号采集与处理系统。
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。
The significance of electrical protection and definite value of DC traction power supply system for metro is illustrated.
阐明地铁直流牵引供电系统电气保护设置与定值的重要性，着重论述地铁电气保护设置的主要原则。
The computer control system hardware based on S7400 PLC, the system power supply, full digital 6RA70 DC drive configuration for the system and PROFIBUSDP field bus configuration are introduced.
提出了S7 400系列计算机控制系统的硬件配置、系统的供电方式、全数字直流调速系统6RA70的传动配置方案以及PROFIBUS DP现场总线的连接方式。
The detecting circuit of power line touching of the suspension system of DC long-distance reserve power supply of PHS Cell Station was designed by the characteristic of gaseous discharge tube.
利用气体放电管的特性，实现了小灵通基站后备直流远供电源悬浮系统动力线碰触的检测；电路结构简单，实用性强。
It analyses the rail transit DC traction power supply system voltage type frame protect device and rail voltage limited device matching problems that solve their adjusting value and time.
分析了轨道交通直流牵引供电系统的直流设备电压型框架保护装置与轨道电位限制装置定值和时间配合存在的问题及解决办法。
At the same time, about the problems of this system, such as system halt, 24V DC power supply and the override of main blow flow low and so on, the improvement suggestion and preventio…
同时针对系统出现的问题，如系统死机、24VDC电源、主风低流量信号切除等问题提出了规避措施和改进方案。
Introduces the principle of frame leak protection in DC traction power supply system, and compares it with OVPD to explain the cooperation of them.
介绍了直流牵引供电系统中常见的框架泄漏保护装置的原理，并与轨电位装置进行比较，说明两者的配合。
Introduces the principle of frame leak protection in DC traction power supply system, and compares it with OVPD to explain the cooperation of them.
介绍了直流牵引供电系统中常见的框架泄漏保护装置的原理，并与轨电位装置进行比较，说明两者的配合。
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