当输电距离足够长时，直流输电的经济性将优于交流输电。
As the transmission length reaches a certain distance, DC transmission becomes economically attractive over ac.
ABB已经获得为中国首条高压交流输电线提供产品订单。
ABB has won an order to supply products for the highest voltage AC power line ever built in China.
研究特高压交流输电电磁环境问题对我国特高压工程建设具有重要意义。
The study on electromagnetic environment of UHV AC power transmission is of significance for the construction of UHV AC transmission lines in China.
灵活交流输电(FACTS)技术的利用能够对电力系统可靠性产生重要影响。
The utilization of Flexible ac Transimssion system (FACTS) technology has significant impact on power system reliability performance.
该补偿器用于该项目的一部分家庭的技术称为灵活交流输电系统(FACTS)。
The compensators used in the project are part of a family of technologies known as Flexible Alternating Current Transmission Systems (FACTS).
静止无功发生器可提高交流输电系统和配电系统的电压调节能力、系统稳定性和功率因数。
Static var generators are used to improve voltage regulation, stability, and power factor in ac transmission and distribution systems.
高压交流输电线路单位长度充电功率很大，由于空载长线电容效应将会引起很高的工频过电压。
Because of large capacitive charging of long ac transmission line, capacitance reaction of no loaded line will cause severe overvoltage.
比起交流输电和本地发电，轻型高压直流输电系统不仅具有成本优势，它也对提高交流电网电能质量提供了新的途径。
Compared to the ac Transmission and local power generation, HVDC light system is not only cost advantages, it also exchanges to enhance ac power quality for a new approach.
横跨国土的高压直流输电线路与高压交流输电线路相比，在线路造价上的节省可能抵销高压直流换流终端站更高的造价。
In cross-country transmission lines, savings in the cost of HVDC lines can offset the higher cost of HVDC terminals when com-pared with HVAC transmission line.
采用灵活交流输电系统（FACTS）技术能快速灵活控制系统输电线路的功率流向和大小，充分发挥现有系统的潜力。
Flexible AC transmission system(FACTS) show promise for better utilizing and controlling existing transmission systems. In this paper'several FACTS technologies are introduced.
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。
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.
现在有人开始质疑这一标准的适用性，因为在远距离输电的情况下，采用高压直流(HVDC)要比高压交流损耗小。
Some people, however, question that standard because over long distances high-voltage DC lines suffer lower losses than AC.
同时，直流接地极关系着高压直流输电系统的安全运行，对于附近的交流系统也有影响，其中的一些问题也十分值得研究。
At the same time, problems of the DC grounding system are valuable because it is not only significant in HVDC operation but also affects the AC system nearby.
直流输电系统接地极电流对交流电网的影响分析。
Analysis on influence of ground electrode current in HVDC on AC power network.
交流特高压输电线路是我国未来统一电网的骨架。
Ultra-high voltage transmission line will be the main frame of power network in China.
在研究高压直流输电所引起的谐波问题时，应该将交流和直流系统作为一个整体来计算，才能获得准确的结果。
So far in studying harmonic problems caused by HVDO transmission, the ac and DC systems should be treated as a whole to obtain accurate results.
目前主要选择交流电缆，因输电的距离未足以使选择直流电缆在经济上可行。
AC cable, since the required lengths have not been sufficient to make DC cable economically feasible.
对于输电系统输送的交流电，超导电缆在传导时确实会损失一些能量。
With the alternating current that flows through the power distribution system, the superconducting cables do suffer some losses of energy.
通过1888年，特斯拉举行交流多项专利电动机，发电机，变压器和输电系统。
By 1888, Tesla held several patents on AC motors, generators, transformers, and transmission systems.
低压直流输电系统是换流站内重要设备之一，直接影响到整个直流输电系统及相关交流系统的安全稳定运行。
The low voltage DC system is one of the most important equipments in converter station, which is closely associated with the safety and stability of DC transmission system and correlative AC system.
本文讨论了直流输电用交流滤波器的选型和参数的优化。
Selection of the type of AC filters used in HVDC Projects and optimization of their parameters are discussed.
本文利用加拿大SES公司出品的CDEGS软件包对交流超高压以及特高压输电线路就这四个方面进行了详细的仿真研究。
With Canadian SES's CDEGS software, this paper makes detail simulation research on the four electromagnetic parameter of AC EHV and UHV transmission line.
介绍了一种高压输电线接头处交流电阻在线测量的原理、方法及软硬件的实现。
A new method of on line measuring ac resistance at the joint of high voltage transmission line and its practice of soft ware and hardware are described in this paper.
背靠背高压直流输电(HVDC)系统已经在交流系统连网中得到了应用。
故障的直流输电系统中的电气特性的交流系统更复杂。
The faults of HVDC power transmission system make the electrical characteristics of AC system more complex.
故障的直流输电系统中的电气特性的交流系统更复杂。
The faults of HVDC power transmission system make the electrical characteristics of AC system more complex.
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