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Research on characteristics of surface electric field on transmission lines under lightning stroke

Research on characteristics of surface electric field on tra...

引用

2011 7th Asia-Pacific International Conference on Lightning, APL2011

作者： Li, Qian Yu, Zhanqing Zeng, Rong Zhang, Yong Li, Zhizhao Zhuang, Chijie Liao, Yongli State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Department of Mathematical Sciences Tsinghua University Haidian District Beijing 100084 China Electric Power Research Institute CSG Guangzhou China

ISBN: (纸本)9781457714665

Lightning is a major cause of power interruptions in power transmission lines. Nowadays the Leader Progression Model is an advanced method to evaluate the shielding failure probability of transmission lines. Calculating the surface electric field on phase conductors and ground wires precisely is important, because the surface electric field has great effect on the upward leader inception. In this paper, the influence of lightning current and some other factors on surface electric field were analyzed. © 2011 IEEE.

关键词： Electric lines

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Traveling waves based faulted feeder selector and its field application

Traveling waves based faulted feeder selector and its field ...

引用

2011 International Conference on Advanced Power System Automation and Protection, APAP 2011

作者： Shi, Shenxing Wang, Jun Li, Aiming Du, Xinchun Cao, Xiaoxia Du, Yajun Dong, Xinzhou State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Yulin Power Company Shaanxi 719000 China China Jiuquan Satellite Launch Center Plumbing Electrical Station Jiuquan 732750 China

ISBN: (纸本)9781424496198

The paper proposes faulted feeder selector in power distribution system with neutral non-effectively grounded. At first, the paper presents basic principle of single-phase-to-ground fault feeder selection based on traveling waves, which compares amplitude and polarity of the initial current traveling waves in all feeders. Then the implementation scheme, including hardware design and software flowchart is presented. At last field application of faulted feeder selector is introduced. The field operation results validated the correctness of faulted feeder selector based on transient traveling wave. © 2011 IEEE.

关键词： Electric grounding

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Research of protection communication system in process level of intelligent substation

Research of protection communication system in process level...

引用

2011 International Conference on Advanced Power System Automation and Protection, APAP 2011

作者： Xu, Fei Wang, Bin Dong, Xinzhou Cao, Runbin Liu, Kun Yang, Yuelin Wu, Tingting State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Beijing 100084 China College of Information and Electrical Engineering China Agricultural University China School of Electrical Engineering and Renewable Energy China Three Gorges University Yichang 443000 China

ISBN: (纸本)9781424496198

The paper mainly focuses on the communication problem based on IEC61850 communication protocol. As in the process level communication system: MU (Merging Unit)-Switch-DIPC (Digital Integrated Protection and control system), the stability of SMV packets transmission is very important. The transmission delay of the process level communication is the key problem that may restrict the protection algorithm and capability. In the meantime, GPS synchronization problem of MUs, protection capability of the integrated protection device and stability of SMV message transmission based on the existing DIPC(DIP-01) system will also be discussed in the paper. Through the experiment and analysis, the paper gives out the key factors that lead to the message transmission delay and packets loss. The work at last gives out some primary ideas to improve the protection capability. © 2011 IEEE.

关键词： Ethernet

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Demand analysis of the information sharing among multi-bays through the process networks in intelligent distribution substation

Demand analysis of the information sharing among multi-bays ...

引用

2011 International Conference on Advanced Power System Automation and Protection, APAP 2011

作者： Yang, YueLin Wang, Bin Wen, BoYing Dong, XinZhou Wu, TingTing Liu, Kun College of Information and Electrical Engineering CHINA Agricultural University Beijing 100083 China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Beijing 100084 China School of Electrical Engineering and Renewable Energy China Three Gorges University Yichang 443000 China

ISBN: (纸本)9781424496198

Multi-bay information sharing has very important significances for the the enhancing of the relay characteristics and improving of the system control methods. With the summary of distribution substation busbar protection, small current grounding fault line selection, non-communication double-circuit line protection, reactive power and voltage control, low frequency load shedding control programmes, It analyse the needs of the information sharing among multiple bays and the application of integrated protection. © 2011 IEEE.

关键词： Electric grounding

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Designation and development of hardware platform for intelligent ter-minal in 126kV smart substation

Designation and development of hardware platform for intelli...

引用

2011 International Conference on Advanced Power System Automation and Protection, APAP 2011

作者： Sun, Tong Wang, Bin Dong, XinZhou Zhang, ShuJian Kang, MingCai Cao, RunBin School of Automation Nanjing University of Science and Technology Nanjing Jiangsu 210094 China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Electrical Engineering and Automation Hefei University of Technology Hefei Anhui 230009 China

ISBN: (纸本)9781424496198

According to the demand of 126kV intelligent switch with intelligent operative box, an intelligent terminal device by using cooperation control of embedded CPU (STM32F103ZET6 ARM) and Field Programmable Gates (Cyclone II EP2C8Q208C8 FPGA), which is up to the IEC61850 standard, is designed in this paper. Research program of the device is discussed. Starting from the modularization structure design, function of each module, circuit design and implementation method were introduced in detail. A hardware platform was established according to the design. Finally, the article confirmed the correctness of the hardware platform primarily through experimental method. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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IEC61850-based information modeling of 126KV intelligent terminals

IEC61850-based information modeling of 126KV intelligent ter...

引用

2011 International Conference on Advanced Power System Automation and Protection, APAP 2011

作者： Zhang, Shu-Jian Wang, Bin Sun, Ming Dong, Xin-Zhou Sun, Tong Cao, Run-Bin Electrical Engineering and Automation Hefei University of Technology Baohe District Hefei 230009 China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China School of Automation Nanjing University of Science and Technology Nanjing Jiangsu 210094 China

ISBN: (纸本)9781424496198

The stability and reliability of the intelligent terminal's receiving information affects its control of intelligent switch in operation directly. To achieve reliable intelligent communications terminals, with techniques and methods of IEC61850 modeling, the paper completed the 126KVGIS intelligent terminal information model based on the analysis of its information characteristics, and established the hardware platform with data model and logical nodes provided by IEC61850. Thus it has a certain practical significance to promote the standard construction, operation and management of intelligent substation, and lead the digital process of process layer devices. © 2011 IEEE.

关键词： Digital devices

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Communication test and analysis of integrated protection system in digital substation

Communication test and analysis of integrated protection sys...

引用

2011 International Conference on Advanced Power System Automation and Protection, APAP 2011

作者： Wu, TingTing Shi, ShenXing Wang, Bin Zhou, YunHai Dong, XinZhou Liu, Kun Yang, YueLin School of Electrical Engineering and Renewable Energy China Three Gorges University Yichang 443000 China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China College of Information and Electrical Engineering CHINA Agricultural University Haidian District Beijing 100083 China

ISBN: (纸本)9781424496198

The development of digital substation provides new opportunity for integrated protection. However, the realization of integrated protection is constrained by serial communication between process level and bay level. Based on developed digital integrated protection and control system platform, the result of a physical simulation test concerning communication system reveals the problem of communication instability and packet loss. In this paper, the impact of GPS exerted on stability of integrated protection is tested and analyzed. Without GPS time setting of Merging Unit(MU) in different bay, the integrated protection system will lose data in one minute after running. With GPS, the communication is stable and reliable, but the time interval between two packets in a cycle is quite long. Since sampling of MU in different bay is synchronized by GPS, the availab.lity of integrated protection system is directly affected by communication of integrated protection in digital substation. © 2011 IEEE.

关键词： Packet loss

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The research of synchronized phasor measurement units in smart substations

The research of synchronized phasor measurement units in sma...

引用

2011 International Conference on Advanced Power System Automation and Protection, APAP 2011

作者： Xu, Yong Zhang, Dao-Nong Yu, Yuehai Status Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China China Electric Power Research Institute Haidian District Beijing 100085 China North China Power Engineering Co. Ltd. Beijing 100120 China State Grid Electric Power Research Institute Nanjing 210061 China

ISBN: (纸本)9781424496198

Smart substation is the base of smart grid and it is made up of a lot of IEDs (intelligent electric device). Synchronized phasor measurement unit (PMU) plays a very important role in the smart grid, and a great deal of PMUs have been installed in China. The requirement of PMU in the smart substation is different from traditional substation. This paper introduces that the PMU is suitable for smart substation, there are several details that need to be complemented in IEC 61850 standards, and the paper gives some suggestion to improve it. © 2011 IEEE.

关键词： Phasor measurement units

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Research on the visual system of semi-submersible heavy lift vessel handling simulator based on OSG

Research on the visual system of semi-submersible heavy lift...

引用

2010 International Conference on Audio, Language and Image Processing, ICALIP 2010

作者： Lian, Jingjing Yin, Yong Yang, Xiao Zhai, Xiaoming Key Lab. of Maritime Simulation and Control Dalian Maritime University China Navigation College Dalian Maritime University China

ISBN: (纸本)9781424458653

STCW78/95 convention proposes new requirements for operation training of special purpose ship, so it becomes vital and necessary to realize semi-submersible heavy lift vessel handling simulator. The visualization of semi-submersible heavy lift ship handling simulator can be realized under the Visual C++ and OSG visualization development environment. The core technologies are described in details such as multi-viewport display, camera control, collision diction and response. And the simulation results are satisfactory by test. ©2010 IEEE.

关键词： Simulators

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Study of distributed multiaxial intelligent tightening machine based on fieldbus control system

Study of distributed multiaxial intelligent tightening machi...

引用

2010 International Conference on Intelligent control and Information Processing, ICICIP 2010

作者： Fan, Yunsheng Guo, Chen Meng, Wei Department of Traffic Information Engineering and Control Navigation College Dalian Maritime University Dalian China Key Lab. of Simulation and Control of Navigation System College of Information Science and Technology Dalian Maritime University Dalian China

ISBN: (纸本)9781424470488

We put forward a system structure of controlling the tightening operation of bolts using multiraxial tightening machine. A kind of fieldbus intelligent tightening control system is designed with the technology developing of fieldbus intelligent instrumentation. This system is a distributed structure based on fieldbus control system which consists of CAN bus, Profibus-DP bus, and adopts many advanced intelligent control methods. This system structure and intelligent control method study realizes integration of manufacture, control and management in the tightening of bolts and improves the level of network manufacture and information management of automobile industry. The integrating of tightening machine and fieldbus brings a new thought of automobile industry control technology. © 2010 IEEE.

关键词： Automotive industry

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