The system study, manufacture of main equipment , development of valve control, station control, DC protection, installation and commissioning have all been undertaken by domestic organizations.
该工程系统研究、主设备制造，阀控、站控，直流保护设备研制，安装及调试全部由国内单位承担。
As has been proved that automatic charge and protection of the storage cell can extend its life, then improve the reliability of the DC system.
运行实践表明，通过对蓄电池的自动充电和智能保护，延长了蓄电池的寿命，提高了直流系统运行的可靠性。
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。
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。
DC system had to achieve, under-voltage protection and voltage show a combination of device integration is very high.
实现直流系统过、欠压保护及电压显示的组合，装置的集成度非常高。
The protection of feeder line in DC traction supply system is based on microcomputer, which is used to control and protect the high-speed circuit breakers.
直流牵引供电系统的馈线保护以微处理器为基础，用来完成对直流快速断路器的控制和保护。
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.
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。
This paper introduces a new kind of DC examination and selective leakage protection system based on DC Current Sensor examination and single chip computer control.
介绍了一种基于直流电流传感器检测和单片机控制的新型直流检测式选择性漏电保护系统，重点阐述了系统应用软件的设计。
It can be used to provide blocking protection to a specific DC motor speed control system.
用此方法对一个直流电机数字控制调速系统进行堵转保护。
The voltage of the analog signals in control and protection circuits are all below DC 24V.
控制和保护回路模拟信号的电压都低于24V直流。
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。
DC Variable AC, quasi-sine wave. Automatic protection, safe and reliable. Small size, light weight and high efficiency. Pollution-free, maintenance-free, easy to use.
直流变交流，准正弦波。全自动保护，安全可靠。体积小，重量轻，效率高。无污染，免维护，使用方便。
By employing the DC earthed protection theory, this paper analyzes the characteristics of the converter transformer earth fault and the influence of converter commutation.
在简要介绍直流接地过流保护原理的基础上，分析了换流变阀侧接地故障的故障特征以及换流阀换相过程对故障电流的影响。
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。
Distribution parameter theory is applied to study earth leakage protection of DC trolley network and a mathematic model of trolley network is established.
应用分布参数理论，研究直流架线电网漏电保护问题，建立了架线电网的数学模型。
The optimal design of HVDC control and protection parameters in the case of large-scale ac and DC power system network is a valid measure to ensure achieving good transient and stable performance.
对大规模交直流网络下的高压直流控制保护系统进行参数优化设计，是保证灵活交流输电系统暂态性和稳定性良好的重要手段。
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。
Short-circuit fault model simulation results show that the locomotive starting current is similar to the remote short-circuit current will affect the DC line protection.
短路故障模型的仿真结果表明机车起动电流和远端短路电流的相似会对直流馈线保护造成影响。
The security is the most important thing of the whole public traffic system. Hence, the relay protection study of multi-car's DC traction supply system is significant.
公共交通的安全性是衡量整个系统的首要因素，因此，研究多车直流牵引供电系统继电保护具有重要意义。
The operation and characteristics of the DC DC converter are discussed, and its control and protection circuit is presented. It is verified by experiment.
分析了该变换器的工作原理和特性，简介了变换器的控制和保护电路，并用实验进行了验证。
Short-circuit protection: A short circuit placed between the DC Return and the output shall cause No damage and the power supply shall shutdown.
短路保护：短路停机放置在直流输出的收益和应造成任何损害和电源应。
The behavior principle of DDL protection for DC feeder in DC traction current supply system and the setting principle of protection parameters are introduced and illustrative examples are given.
介绍直流牵引供电系统中直流馈线ddl保护的动作原理，以及保护参数的设定原则，并举例说。
The power circuit is composed of following circuits: RF oscillator, RF power amplifier, DC supply power circuit, protection circuit and matching network.
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 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。
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。
In the end, it discussed the protection system of DC voltage-stabilized source and put forward the principles of protection system design and the measure of the whole machine protecting.
最后讨论了稳压电源的保护系统，提出保护系统设计的原则和整机保护的措施。
The principle of the relay protection of multi-car's DC traction supply system and the several DC feeder protection methods were presented.
介绍了地铁直流牵引供电系统保护的原理，和所采用的几种直流馈线保护方法。
The paper discussed the DC traction power supply system's feeder protection configuration in the end, and detailed analysis the principle of protection based on the current amount.
探讨了直流牵引供电系统馈线保护配置，详细分析了基于电流变化特征量保护的原理。
Stauntonia chinensis DC, containing ginsenosides, proteins, flavonoids and suchlike, is good for health protection and cosmetology.
本文选择的研究对象-野木瓜中含有丰富的皂甙、糖、蛋白质、黄酮等，具有非常好的保健养颜功能。
Stauntonia chinensis DC, containing ginsenosides, proteins, flavonoids and suchlike, is good for health protection and cosmetology.
本文选择的研究对象-野木瓜中含有丰富的皂甙、糖、蛋白质、黄酮等，具有非常好的保健养颜功能。
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