The communication management device is a connecting link between the preceding and the following , which has three functions : ( 1 ) controlling the data exchang between the middle layer and the substation layer of ias in accordace with the transmission protocol iec60870 - 5 - 103 通信管理装置具有承上启下的作用，主要完成3项功能： ( 1 )按照传输规约iec60870 - 5 - 103控制牵引变电所综合自动化系统中间隔层与变电所层的数据交换。
The development of dc control power system described in this paper is oriented to the baoji - chengdu electric railway - engineering project . a dc control power system , which is based on plc , hf switch rectifier and valve control seal battery is described in the paper 本文结合宝成复线电气化工程，针对牵引变电所直流控制电源系统设计，阐述了一个基于plc控制器、高频开关整流装置和阀控式密封铅酸蓄电池的直流屏的设计和产品研制。
Ias , psmis and the information exchange and processing between these two systems have important effects on some aspects , such as the running and management ability of electrified railway , the maintaining and maintenance measures of electrical equipments , the economic efficiency of traction department , and so on 牵引变电所综合自动化系统、牵引供电运营管理信息系统及其之间的信息交换与处理在提高电气化铁路的运行和管理水平、转变设备维护与检修手段、减员增效等方面有着重要的作用。
The designing and researching of dc control power system of a typical traction power substation such as system designing , hmi and program designing , elements choice , panel configuration etc . are carried out . automation control and management of the system are introduced in the paper as well as plc , touch screen and collecting , inspecting device 文章描述了典型牵引变电所直流控制电源的系统设计，产品构成，元器件选择等，同时对本系统以plc为核心的管理单元，工业触摸屏为人机界面，以及全方位的采集、检测设备进行了叙述，介绍了系统在自动化控制和管理方面的技术特点。
Nowadays , it is certainly demanded for the electrified railway to modernize traction power - supply technology and management technology . with the aid of the development of micro - electronic , computer and network communication technology , it is possible to use these technologies to improve the extent of automation and increase the speed of railway modernization 当前，牵引供电技术和运营管理技术的现代化是对电气化铁路的必然要求，微电子技术、计算机技术和网络通信技术的进步为铁路现代化的实现提供了条件，研制牵引变电所综合自动化系统和牵引供电运营管理信息系统正是应时所需。
Now the affect and the measure of hypo _ harmonics is in the research . the influence of negative sequence is almost eliminated along with the enlargement of the system ' s capacity and the alternate connection of traction substations . the fixed parallel compensate equipment applied in traction substations consist of a constant capacitor and a constant inductance , so its output is constant 负序电流的问题已经因系统容量的增大、牵引变电所采用轮换接线方式而基本解决，电力部门实行的“反转正计” ，使采用对无功功率固定补偿方式由于牵引负荷变化频繁而出现补偿容量不足或过补偿现象，难以达到满意效果。
Dc control power system , which plays an important role of traction power substation , is expected to be with the characters of higher reliability , automation , precision , smaller figure and maintenance - free while the technique and management of electric railway develop rapidly 直流控制电源系统是牵引变电所的重要组成部分，随着铁道电气化技术及运营管理的发展，对直流控制电源系统提出了更高的要求，具备高可靠、小型化、自动化、高精度、免维护等特征的直流电源已倍受关注和期待。
However , a large amount of harmonic is generated in the power network when the electrified railroads loads consume fundamental frequency electric power . these harmonics make bad effect on the operation of protection relays and the precision of electricity measures , worsen the power quality and threaten the security of traction substations as well as other equipments in power system 但是电气化铁道从电网取得工频能量的同时，向电网注入了大量的高次谐波电流，降低了供电质量，影响了继电保护的正确动作和电气量测量的精度，威胁牵引变电所的安全运行及电网中其他用电设备正常工作。
