Under the background of integration of power system,control system and communication system,in order to deal with the great challenge that the current electric power dispatching data network brings from the boom of IP business,the proposition of network model of the next generation electric power dispatching data network is imminent.According to the needs of data transmission of the complex power grid,this paper selects the appropriate technical solution based on the contrast of current popular interface technology.This paper designs the agile and reliable network topology on the foundation of the layered model of three layers network,puts forward the network mode of electric power dispatching data network under the complex power grid through the hierarchical routing strategy and special business channel deployment,and centering on effectiveness,reliability and safety.The mode provides direction and reference for the construction and renovation of electric power dispatching data network under the complex power grid.
With the continuous improvement of level of informatization,the softswitch technology will replace the traditional circuit switching technology gradually.In view of the characteristics of the electric power dispatching system,this paper proposes the principles of softswitch transformation in power dispatch system.Then this paper designs the scheme of softswitch transformation based on the proposed principles.The scheme has the high reliability and the good compatibility,which can transform the traditional switching technology of electric power dispatching system into the softwitch technology gradually under the premise of security and stability.
The electric power dispatching data network is becoming an important technology mean for the command of power grid dispatching and its safe and stable operation.The expansion of dispatching data network is the necessity of the development of power grid.For the construction of dispatching digital network in Guizhou power grid,and through analyzing the applied needs of local area network,this paper compares the provincial network extension mode and the grading mode of provincial and regional network,proposes the grading mode is more suitable for the network construction in Guizhou,and explores the schemes of networking and network interconnection.
The high definition video conference system is the focus of research and application,but the weak current wiring for conference hall as one of its basis application is little attention.The deal of the development and change of application terminal by the foundation invariant is the problem that designer needs to consider for the weak current wiring for high definition video conference hall.According to the practical experience and the law of the video signal processing technique development,this paper proposes an improved scheme for the video terminal interface socket and its wiring.According to the application effect of the audio terminal handling technology,it proposes an improved scheme for the tone terminal interface socket and its wiring,and elaborates the application method for the combination socket and network cabling of conference hall,proposes the notes of design,etc.For the weak current wiring of high definition video conference hall,the scheme has the strong practical value.
This paper introduces the design idea and design scheme of the low-voltage meter reading system based on Bluetooth technology.Through analyzing and comparing,the communication mode of this system is more reliable than the carrier and other communication modes.It builds the Bluetooth module based on the study of the Bluetooth module hardware and software architecture.Through studying the technical problems of actual site,this paper designs the Bluetooth and RS485 mixed networking scheme and the Bluetooth networking scheme for different scene requirements,researches the data communication process of meter reading system based on Bluetooth technology.The low-voltage meter reading system based on Bluetooth technology has the high reliability and the flexible networking.It can not only solve the technical problems based on carrier and other communication modes but also reduce the construction costs.
The traditional point-to-point information collection mode has the low communication efficiency,wastes large amounts of channel resources,seriously restricts the applied needs of scheduling businesses,so the scheduling production system is supposed to establish and perfect the private network of power dispatching data.The network weaving and self-healing function of private network can effectively improve the reliability and stability of the information transmission,so that the information transmission capacity and transmission efficiency between scheduling and substation are greatly improved.Combined with the structural characteristics of Bozhou area scheduling data network,this paper expounds the status,objectives,planning,program of network construction.It provides the reference for the following dispatching data network construction.
This paper discusses the two key factors,such as the redundancy design and the real-time communication message,which impacted the hydropower station monitoring system performance.And it analyzes in detail the running mode from the monitoring device to the communication manager unit and monitoring server.And then paper puts forward some means,such as the secondary package and the registered transmission,which could enhance the real-time message transmission,provides the scheme for building the fine monitoring system.Finally,this paper evaluates the practice effect based on Three Gorges Project and Xiangjiaba and Xiluodu projects.
The paper introduces the basic characteristics,model selection,maintenance requirements and backward cell processing method of the sealed lead acid battery based on the practice of substation communication,elaborates the test requirements of battery charge-discharge.In the typical configuration,this paper brushes the methods and procedures of communication battery charge-discharge test,discusses the risk of charge and discharge test in the operation and maintenance for communication battery,and finds out the possible dangerous points in the processing of charging and discharging.At the same time,this paper lists the typical examples on safety risk and carries on the analysis on accident cause,puts forward the pre-control measures.It has significance for improving the safe operation of information communication system.
Due to the inadequacy of urban cable duct and cable pole,the adoption of the 10 kV optical fiber composite overhead insulated cables is the most effective solution for increasing the utilization of optical fiber of 10 kV communication terminal access network,.However,it is cautious to use optical fiber composite cables in the 10 kV communication terminal access network because of the influence of lightning strike,urban renovation,accidental damage.The paper develops a type of connection-box that can permanently fix the broken-cables of 10 kV optical fiber composite overhead insulated cables.Moreover,this paper solves the adverse factors,such as th small outer diameter of connection-box and the large bend loss of remained fibers by using G.657.A2 bend insensitive fibers to produce the 10 kV optical fiber composite overhead insulated cable.According to the testing results,the performance of the products satisfies the related requirements.
This paper analyzes the typical fault phenomenon of OPGW such as breaking stock and breaking core.For improving the pertinence and effectiveness of electric optical cable maintenance and reducing the operating and maintenance costs,Xianning Electric Power Bureau develops the research and implementation on the standardization of OPGW access substation architecture.The paper has the strong pertinence and realistic meaning for the safe operation of OPGW.
Based on the bidirectional communication technology of high integration and high speed,the power system will build the unified smart grid about power,information and business.As the interior communication of power system and the interactive network of information of power grid and users,the electric power communication network will support the monitoring and control of network state,and the interactive information service of users,it makes the grid more reliable,flexible and intelligent.For the basis and characteristics of county electric power communication network in China,combined with the development of smart grid,this paper analyzes the characteristics of the planning and construction of county-level electric power communication network,contrasts the economy and applicability of the different levels of power grid communication technology.Finally,it proposes the characteristics and direction of county electric power communications network in China.
In order to promote the development of design level of nuclear power communication system,and improve the safety and reliability of nuclear power communication system based on the high quality engineering design.Considering the design of the third-generation nuclear power communication system with AP1000,this paper analyzes and researches the division of design,the communication system scheme,the communication method with management department of nuclear power,communication for normal or emergency condition and so on.Through the analysis and research of the nuclear power communication system,the paper presents the practical and feasible solution for the problems of the design,and summarizes the experience.The communication scheme of the nuclear power station and management department that this paper proposed is a novel,safe and reliable,economical and practical solution,it is worth for spreading application.
To ensure the multiplexing of power line carrier frequency,this paper needs to qualify the substation line with three-phase blocking.This paper discusses the problem of three-phase blocking.According to the carrier principle and frequency distribution requirements,it analyzes the necessity of three-phase blocking,and puts forward some problems of three-phase blocking,and through some examples to simply calculate whether the frequency could be reused,and whether using three-phase blocking.Finally it provides some advice for the real project.
The main equipment of cable fault automation monitoring system is optical time domain reflectometer(OTDR).This article introduces the working mechanism and key parameters of OTDR,designs the handle OTDR system based on FPGA,and illustrates the structural characteristics and design principle in detail.This system transmits data by PCI wire bus with the exist platform.Finally,through testing the dynamic range and blind area of OTDR,this paper analyzes the attenuation of event points and loss calculation.It has a reference value for the maintenance and repairing of electric power optical communication network.
The power line communication(PLC) uses power line as the communication media of data transmission and information exchange.Because the advantages of wide covering and no needing to renew wire,PLC has been paid more and more attention and has great application potential.Meanwhile,the power line access has the characteristics of the high noise interference and the frequency selective fading.If the problems can be solved,the power line communication technology will realize the comprehensive application.Based on the status of electric energy information collection technology for low voltage region,the feasibility of adopting the low voltage power line communication and the problems of low voltage power line communication,the paper analyze the application of low voltage power line communication technology in power-using information collection system.
The proposition of green grid points out the direction for the reliable,efficient,clean development of future grid.The communication technology is the prerequisite and guarantee for realizing the bilateral interaction of green grid information business.According to the development needs of green grid,the construction of intelligent communication network will adopt the suited communication technologies to achieve the efficient transmission and exchange of the power system business information.Firstly,this paper analyzes the opportunities and challenges which the development of green grid caused.Secondly,it researches the necessity and feasibility that different communication technologies is used in green grid business delivery platform.Finally,it looks forward the future structure system of intelligent communication network.
Optical fiber composite overhead line(OPPC) sets the transmission and communication into its functions.The 10 kV line was applied in Shenzhen tiger pit power plant since 2005,was accepted by the electric power customers constantly in recent years,which had become the new favorite in the application of metropolitan area distribution network.Due to the overhead line of metropolitan area distribution network has a narrow power distribution network channel and it is easy to be covered by trees and dense buildings etc,some lines must insulate to ensure safety.The biggest technical difficulty is the whole insulation of OPPC connector box.Through analysis of the security requirements of all lines,this paper achieves the demands of fully insulated OPPC fiber connection,introduces the development process of the whole insulation OPPC connector box and its application in engineering practice,and accumulates the experiences for realizing the application in the metropolitan area distribution network.
Through the analysis of the wireless communication technology,this paper proposes the application prospect of wireless accessing technology in smart distribution grid.The paper points out the needs of communication system in smart distribution grid,makes a research and comparison for the various wireless accessing technologies such as GPRS,ZigBee and IWDN,makes the technical analysis for the distribution communication network,illustrates the advantages and disadvantages of wireless accessing technology in the distribution grid.Finally,the paper introduces the technical characteristics,network scheme and application points of the IWDN technology,then points out that the micro-power wireless Ad-hoc network technology of the intelligent routing would become the most promising wireless technology.
Based on the analysis of the monitoring system of SGCC,this paper puts forward the general concept and framework of the comprehensive electric power monitoring system.This paper introduces the application of integrated grid monitoring system in power system.It describes the architecture,network,composition,function and features of system.The practical examples show that the monitoring system of the power system can achieve some functions,such as the remote monitoring,the unified management and the centralized scheduling,and so on.It makes sure the safe working for the power supply system.
This article introduces the architecture of electric bus ad hoc network based 433MHz radio frequency communication.Through the analysis of the operation scene of electric bus and the 433-band technical characteristics,this paper puts forward two kinds of communication mode,achieves the electric data transmission and the real-time monitoring for the communication node of the bus.In addition,this paper gives the hardware architecture and software function of communication node devices,explores the application of IOV in the field of electric vehicle.
