This paper analyzes why dc system ground fault causes power unit outage and proposes improvement plans. The prevention measures are put into effect.
文章分析了直流接地引起主机停运的原因，并提出了改进方案，实施了防范措施。
It will hold six batteries for power storage and will use a 120V DC power distribution system, compared to Apollo’s three-battery storage and 28V DC system.
与阿波罗的3个电池储备和28伏的直流系统相比，猎户飞船将有6个电池的电力储存，使用120伏的直流电源分配系统。
In this paper, a new method for DC system grounding fault detecting is presented.
文中提出直流系统接地故障检测方法。
The insulation level influences reliability of DC loop in the DC system directly.
直流系统的绝缘性能直接影响直流回路的可靠性。
The component of DC system and the principle of DC insulation monitor were discussed.
阐述了直流电源系统的组成，及直流绝缘监测仪的工作原理。
The QSS converter model in account of unsymmetric commutating voltages is developed for DC system.
对直流系统开发了计及换相电压不对称的QSS换流器模型。
The normal operation of DC system is of great significance to the safety and stability of substation.
直流系统正常对于变电站安全稳定运行意义重大。
A new digital adjustable speed DC system controlled by the single chip microcomputer 8098 is presented.
提出一种采用80 98单片机控制的新型全数字式直流调速系统。
Discusses the DC manostat used in the DC system at Yimin Power Plant in terms of safety and reliability.
以安全性与可靠性相统一的原则，对伊敏电厂直流系统中采用的直流稳压器进行探讨。
Therefore, the stage difference coordination problem with the operation of DC system has become a key issue.
因此，级差配合问题就成为直流系统运行中一个比较关键的问题。
The DC system is normally supplied from a battery charger system, which is supplied from the low voltage AC system.
直流系统通常由蓄电池充电系统供电，蓄电池充电系统由低压交流系统供电。
Because the battery is a an important part of DC system, its performance will have a direct impact on the DC system.
蓄电池作为直流系统的重要组成部分，其性能的好坏直接影响到直流系统发挥作用。
To ensure normal operation of the substation, the DC system grounding fault should be detected as quickly as possible.
为保证直流系统的正常运行，查找直流接地故障的时间应尽可能缩短。
The formula of the rectifier's overshoot current of bidirectional 12-pluse DC system when DC line short-circuit fault occurs is derived.
针对双桥十二脉动直流系统，推导了直流线路发生短路故障时的整流器过冲电流公式。
The DC system is capable of rapid response to changes in control setting, with DC power transfer changes occurring faster than in AC systems.
由于直流传送功率的改变要快于交流系统，直流系统对控制整定值能迅速作出响应。
Battery is a basic part of substation DC system, and it is the important device of energy storage and the core of uninterrupted power system.
蓄电池是变电站直流系统的基本组成部分，是重要的储能设备，也是不间断电源的核心。
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。
In AC system, working voltage not more than 1.1 times of rated voltage. In DC system, working voltage not more than 1.5 times of rated voltage.
交流系统中，工作电压不大于额定电压1.1倍，直流系统中，工作电压不大于额定电压1.5倍。
This subject matter is very meaningful to improve the detection of DC system grounding fault and to perfect the safety and reliability of DC system.
本课题的研究对于完善直流系统接地故障检测方法，提高直流系统运行的安全性、可靠性具有特定意义。
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 QSS (Quasi Steady State) model of converter which neglects the negative impedance of DC system will bring some errors when unbalanced fault occurs in AC system.
当交流系统发生三相不对称故障时，忽略直流系统负序分量的准稳态模型将给交直流混合系统的仿真带来较大的误差。
The result indicates the nonlinear variable structure control can adjust the transmission power of DC line effectively, and assure the stability of the AC-DC system.
仿真结果表明，非线性变结构控制可以有效地调节直流线路的传输功率，保证交直流系统的稳定性。
Although DC system had many advantages in long-distance and capacity transmission, DC system monopole operation might have impact on safe operation of Shanghai grid.
虽然直流系统在长距离、容量输电方面有诸多优势，但直流系统单极运行时可能对上海电网的安全运行带来影响。
As a result, the equivalent disturbing current can meet the requirement with all DC filters in service in any operation mode so that DC system can operate well steadily.
结果表明，任何运行方式下直流滤波器的投运均使线路等效干扰电流基本符合要求，直流系统可维持稳定运行。
Substation DC system grounding of substation equipment will cause damage, at the same time the substation on the safe operation of equipment to produce a great threat to.
变电站直流系统接地将会对变电站的设备造成损害，同时对变电站各设备的安全运行产生极大威胁。
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。
Based on a graph-model-database integration maintenance mode, with object-oriented technology, a maintenance system applied in the AC and DC system is developed in this thesis.
本文基于一种图形数据一体化的维护方式，采用面向对象技术，实现了一个适用于交直流系统的维护系统。
The paper analyzes the method of low frequency signal injection, which is usually used to detect DC system grounding fault, and advances the method based on wavelet transforms.
分析了低频信号注入法，并且针对其缺陷提出了基于小波变换的检测方案。
According to the influence of loop net on DC system fault detection, this paper presents a new idea based on Fractal theory to study how Fractal can identify the loop net fault.
针对直流系统中环网对接地故障检测的影响，提出利用分形的思想，初探性研究分形对环网故障的识别。
By digital simulation, the Ac carried wave system and its equivalent Dc system are checked and the feasibility of Dc method equivalent to the Ac carrier wave system is verified.
通过数字仿真，比较了交流载波系统和其等效直流系统，验证了交流载波系统等效直流方法的可行性。
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