Dissertation > Excellent graduate degree dissertation topics show

Research on Several Technology in UHV Transmission

Author: WanYiRu
Tutor: ZhouHao
School: Zhejiang University
Course: Proceedings of the
Keywords: UHVAC GIS VFTO UHVDC lightning withstand performance electromagnetic environment
CLC: TM723
Type: Master's thesis
Year: 2012
Downloads: 239
Quote: 0
Read: Download Dissertation

Abstract


To promote the intensive development of western coal and hydro resources, meet the growing demand for electricity in the eastern and middle part, alleviate enormous pressure of environmental pollution and shortage of land, China’s UHV AC and DC transmission projects have entered steady construction period. But UHV transmission is still facing a lot of technical problems.With the improvement of the system operating voltage, Very Fast Transient Overvoltage (VFTO) in GIS is more harmful to the GIS insulation and transformers. Therefore, the VFTO problem in UHV power grid must been taken seriously. In this paper, VFTO limit level of insulation and characteristics of VFTO amplitude and steepness were combined to analyze the hazard to GIS insulation, transformer main insulation and longitudinal insulation in 1000kV and 500kV GIS system. Targeted and cost-effective suppression measures for VFTO were proposed. The relationship of sequence of operations and generated VFTO was analyzed. The results show that VFTO will endanger UHV GIS insulation and transformer longitudinal insulation except transformer main insulation. Transformer onnected by short overhead lines with GIS to protect transformer longitudinal insulation is proposed particularly. And the installation of shunt resistor in disconnector or ferrite bead in mentioned to protect the GIS insulation. In 500kV GIS system VFTO in only harmful to the transformer longitudinal insulation, Using short overhead lines connecting transformer and GIS can eliminate threat of VFTO to the entire 500kV GIS system.UHVDC transmission lines is facing severe lightning stroke in mountain area, and the trip-out rate of shielding failure for common T tower was high, thus the lightning protection of UHVDC transmission line in mountainous area has become a key technology for UHVDC transmission project. So a new tower called Z tower was designed specially for improving lightning withstand performance of shielding failure. Study on the Lightning Protection Performance and electromagnetic environment of Z tower has important significance to reasonable circuit design, safe and reliable line operation and requirements of environmental protection. Compared with T tower, the lightning withstand performances of back striking, shielding failure for Z tower of Zhexidu-Zhexi UHVDC transmission lines as well as related influencing factors were calculated and analyzed with EGM (Electro-geometrical Model) and EMTP (Elector-Magnetic Transient Program), and the electromagnetic environment of Z tower was evaluated with CDEGS and fomulas. The results show that Z tower’s lightning withstand performance of shielding failure is better than that of T tower, and its lightning withstand performance of back flashover is high, overall the. lightning withstand performance of Z tower is superior to that of T tower. Under the lowest nominal height of the tower, all the electromagnetic environment parameters of Z tower can satisfy the requirements in national environmental standards, and all better than those of T tower. Z tower is more suitable for the mountain area.

Related Dissertations

  1. The Studying of University Students’ Community Management Based on GIS,G647
  2. Lijiang River,RS and GIS - based Soil Erosion Research,S157
  3. Assessment of Regional Ecological Agriculture Based on the GIS and Models,S-0
  4. A Study on the Evolution Characteristics of Agricultural Climate Resources and Wheat and Rice Potential Productivity During the Last 30 Years in Jianghuai Region,S162
  5. The Research and Construction of Ecological Risk Assessment and Warning Manage System in Typical Oilfield,X826
  6. GIS tourist satisfaction research based in Qingdao leisure destination,F592.7
  7. Jinan urban WebGis System Design and Implementation,P208
  8. Research on the Application of 3D-GIS to Flood Route Visualization Based on ArcGIS and SketchUp,TV123
  9. Research on Insulation Coordination of UHVDC Converter Station,TM853
  10. Study on Improved Fdtd Methods in the Computational Electromagnetics,TM153
  11. Research of the Complex Electromagnetic Environment Interpeering to the Coaxial Feeding Antenna System on the Warship Platform,TN911.4
  12. Communication under complex electromagnetic environment of anti-jamming technology,TN911.4
  13. Multifunction radar target system,TJ06
  14. Electromagnetic environment based on embedded Linux Simulator Design and Implementation,TN955
  15. Establishment of 3D City Model and Visualization on WEB,TP391.41
  16. A Study on GIS-based Environmental Capacity Management System of Xiangfan Section of Han River,X26
  17. GIS-based radio propagation prediction system,P208
  18. Research of Complex Electromagnetic Environment Simulator of Typical Carrier Fleet,U674.7
  19. Regional economy based on open source software, Web publishing geographic information research,P208
  20. Based on MapInfo Land Information Management System Design and Implementation,P208
  21. The Study and Application on System of Urban Digital Pipe Network Based on GIS,P208

CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Transmission and distribution technology > EHV transmission
© 2012 www.DissertationTopic.Net  Mobile