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直流供电系统     
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  dc power system
     Analysis of leak current DC power system of opencast mine
     露天矿直流供电系统杂散电流分析
短句来源
     DC circuit breakers are the most important protection equipments for DC power system.
     直流断路器是直流供电系统中极其重要的保护设备。
短句来源
     V switching power rectifier configura-tion,battery discharging final voltage,DC power system setting and power equipment layout are discussed.
     就-48V开关电源的整流器配置、蓄电池放电终止电压、直流供电系统设置方案以及电力设备布置等事宜,阐明了观点。
短句来源
     With the reference from DC power system,the low reliability and high cost problems in the AC power system could be solvd through the application of hot pluggable technology in N+X module paralleling inverter and the implementation of decentralized distribution mode which is different from the traditional centralized distribution mode with the UPS as a core in the AC power system.
     借鉴直流供电系统经验,通过应用N+X并联逆变器模块热插拔技术,实行分散式供电,进而改变传统的以UPS为核心的集中供电模式,则可在很大程度上解决一直困扰着我们的交流供电系统成本高和可靠性低的难题。
短句来源
  dc power supply system
     Application of Chaos Theory in Grounding Fault Detection of DC Power Supply System
     用混沌理论检测直流供电系统接地故障
短句来源
     Design of Protection Equipment for Metro DC Power Supply System Based on DSP
     基于DSP的地铁直流供电系统保护装置的设计
短句来源
     The Design of Integrative Protection Circuits in DC Power Supply System for Camping Car
     宿营车直流供电系统综合保护的设计
短句来源
     An On line Method of Power Capacitance Measurement for DC Power Supply System
     一种直流供电系统电力电容的在线测量方法
短句来源
     Improving the Utilization Efficiency of DC Power Supply System
     提高直流供电系统的利用效率
短句来源
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  dc supply system
     The method has also solved the problem of choosing the device of the short-circuit protection for low-voltage DC supply system which is highly waving.
     解决了在电源电压变化大的低压直流供电系统中选择短路保护器件难题。
短句来源
     Technical modification of DC supply system for well electric locomotive
     井下电机车直流供电系统的技术改造
短句来源
     Start with DC supply system constitution, and the situation of DC feeding protection setting, introduces the types and application environment of DC feeding cable used at present time, analyzes the probability of damaging the insulation of DC armored feeding cable in special environment, what protective actions being taken in case of occurrence of insulation fault and its probable losses, briefly illustrates the insulation supervision and protective acting principle of DC cable, and its application scope and necessity in subway and urban mass transit system.
     本文从直流供电系统的构成、直流馈线保护设置情况出发,介绍了目前使用的直流馈线电缆的种类及适用环境,分析了铠装直流电缆在特殊使用环境下绝缘损坏的可能性、绝缘故障时已有保护的动作情况及可能造成的损失,简要阐述了直流电缆绝缘监察保护的动作原理,论述了其在地铁和快速轨道交通系统中的应用范围及必要性。
短句来源
     Applied of short-circuit protection for the same circuit different voltage in the DC supply system
     同一电路不同电压等级直流供电系统中的短路保护实现
短句来源
     New Method of Voltage Self-buildup Applied in DC Supply System Based on Asynchronous Generator
     异步发电机直流供电系统自励建压的一种新方法
短句来源
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  direct current supply system
     On-line Monitor for 1500V Direct Current Supply System
     1500V直流供电系统状态在线监控仪
短句来源
     An installation suit to monitor and control direct current supply system of mine traction engine is introduced which can correctly judge the reasons leading to supply system switch off, monitor current value and its change rate while switching off, show the change curve of current, record switch off times and all parameters and set super-limited current value to control direct current switch off with high speed.
     介绍了一种适用于矿山牵引机车直流供电系统监测与控制的装置,它能正确判明供电系统开关跳闸的原因,监测出跳闸时的电流值及电流变化率,显示电流变化曲线,记录跳闸次数和各种参数,并设定电流超限数值,控制直流高速开关跳闸。
短句来源

 

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      dc power system
    Using a fundamental frequency digital simulation program, the proposed control system has been applied and tested in a realistic electrical AC/DC power system.
          
    The trailer also contains a DC power system, drawing power from deep cycle batteries to provide AC power.
          
      dc power distribution system
    Traditionally, dc power distribution system has been considered for electric vehicle.
          
      其他


    Many disadvantages of DC supply system for well electric locomotive in old mine are stated,the technical modification measures of applying large capacity rectification equipment,radial and centralized supply system and achieved good result are also presented.

    阐述了老矿山井下电机车直流供电系统的诸多弊病。及采取大容量整流设备、放射式集中供电的技改措施和取得的良好效果。

    A DC supply using IGBT to realize rectification and PWM without a transformer can improve power efficiency with less transformation.It snubs current only when each phase voltages and line voltages are low,so it will not pollute the electric net while general supply snubs current in a short time at high voltage. It is prospective and can be widely used in where large current low voltage supply is needed such as LED display and welding machine etc.

    采用IGBT直接实现整流及PWM调制 ,无需变压器 ,减少了能量转换环节 ,提高了电源效率。该电源只在各相电压和线电压较低的时刻吸收电流 ,克服了普通整流电源在高电压时短时间吸收电流对电网的污染。可广泛用于大型LED显示屏、电焊机等大功率低压直流供电系统 ,具有很大发展前途

    A new method is presented to solve the problem of capacitance measurement of a running DC power supply system. By sampling the voltage of a constructed RC circuit transition period, and analyzing the wave form, capacitance is obtained from all of the systematic unknown parameters. This method is proved to be simple but accurate and convenient, and is also feasible for capacitance measurement between the DC power line and the earth or the shield of power cable.

    提出了一种测量直流供电系统电容的简便方法,该方法在不影响系统正常运行的前提下,精确、在线地完成测量过程.通过在线获取RC电路的电压波形,并对波形进行分析,从系统诸多未知参数中获取电容值.这种方法不需要改变供电系统的结构,也不需要系统处于断电状态,可应用于解决直流电力电缆对地(或屏蔽)电容的测量问题.

     
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