220kv or above voltage transmission lines usual adopt double protective disposition ; each has its own independent ac and dc system to control different breaker 220kv及以上电压等级的输电线路的保护配置一般采用双重配置；由两套交、直流输入输出回路相互独立，并分别控制不同断路器的保护装置进行保护。
Leeec may produce the special transformer according to the clients requirements including : commutate transformer ; furnace transfo - rmer ; earthing transformer ; isolation transformer 辽宁易发式电气设备有限公司可根据客户需要，生产各种电压等级特种变压器，主要有整流变压器电炉变压器接地变压器隔离变压器等。
This paper presents a new structure orient to unattended low voltage level distribution station automation , and designs corresponding configuring supervisory and control software system 本论文提出一种面向低电压等级配电所的新型无人值守配电所自动化系统结构，同时，为系统设计相应的具有组态功能的监控系统软件。
Following the development of power system , the upgrade of voltage grade and the appearance of high - power and long distance power transmission , the safety and the stability of power system are much more required 随着电网的发展、电压等级的提高和大功率远距离输电运行方式的出现，对系统安全稳定运行提出了更高的要求。
With the accretion of the power network capacity and the continuous enhancement of voltage level , the preventive test of arrester is not more and more satisfied with the need of the safety and reliability on power supply 随着电网容量的增加和电压等级的不断提高，避雷器的预防性检测越来越不能满足供电安全性、可靠性的需要。
The type of the specific vaccum tap switch which i study is bpkal50 - 10 / 35 - 9c . this tap switch is suitable for 6 - 10kv - voltage degree which maximum current rating is 150a and maximum usable frequency is 50hz 课题具体研制的真空开关型号为bpk 150 ? 10 / 35 ? 9c 。它适用于电压等级为6 ? 10kv ，最大额定通过电流为150a ，额定频率为50hz ，三相任意连接的干式电力变压器。
For the 500kv voltage level of substations , there are two 10m ethernets which are used for the measurement and control network and are standby each other in the csc2000 system . master connects the field bus and ethernet 对于csc2000变电站综合自动化系统，在500kv的高电压等级变电站中，采用10m以太网作为其通讯主网，而装置内及装置间采用现场总线通讯。
With the development of electric power industry , the complexity of electric network and the rank of voltage have been increasing constantly . thus , the integrated automation and unmanned operation have become the directions of further development 随着电力工业的发展，电网复杂程度和电压等级不断提高，变电所实现综合自动化和无人值班已成为电力系统自动化的发展方向。
Fail and turn electric wire into of the distance in 110kv and above voltage high pressure and vltrahigh voltage of grade , the mutual inductor generally adopts the mutual inductor of electric current ( ct ) and voltage mutual inductor ( cvt ) 在110kv及以上电压等级的高压和超高压输变电线路中，互感器一般采用电流互感器( ct )和电压互感器( cvt ) 。电流互感器和电压互感器在继电保护中起着重要的作用。
Found the reliability model by the n - l rule and load supplying capacity ( lsc ) . with an example of hokv local power network , by n - l rule , using load supplying capacity ( lsc ) , educe lsc value and reliability index 本研究以一110kv电压等级的地区电力网为例，结合电力系统的n - 1准则，运用最大负荷供应能力( lsc )的计算方法，在对电网正常运行潮流计算的基础上，得出电网的各lsc值与系统可靠性指标。
