Dissertation > Excellent graduate degree dissertation topics show

Microprocessor-based Adaptive Directional Segregated Current Differential Pilot Protection for Transmission Lines

Author: XueShiMin
Tutor: ZhangYanXia；HeJiaLi
School: Tianjin University
Course: Proceedings of the
Keywords: Microcomputer Protection Line Protection Split-phase current longitudinal differential protection Braking characteristics Adaptive Principle
CLC: TM774
Type: Master's thesis
Year: 2005
Downloads: 179
Quote: 2
Read: Download Dissertation

Abstract


With the development of the grid EHV and UHV transmission lines to study the new protection principle, the line fault to quickly and accurately excision is key to guarantee security and stability operation. Current transformer saturation and line distribution capacitive current and other factors, so that the great imbalance current external short, the current differential protection device malfunction may cause braking measures must therefore be taken. The various braking principle can only guarantee a strong braking action when external short circuit, and the internal short circuit can guarantee high sensitivity. To this end some protection using the a complex polyline brake characteristics, which will enable protection complicated tuning difficulties. Microcomputer adaptive direction longitudinal differential protection principle of braking characteristics with the increase to the end of the current non-linear enhancement, the amount of internal failure brake into action amount fully guarantee the security of external fault and the sensitivity, when the internal fault and resolves this problem. The principle is the first at home and abroad, the principle braking coefficient (greater than 1) can select very large, without any restrictions. The same time, increase the amount of braking, does not affect the internal fault protection sensitivity opposite to increase the protection of sensitivity. Criterion and operating characteristics analysis, and a detailed comparison of the principle, and other typical braking characteristics of the principle, fully embodies the principle of superiority by comparison. By a large number of simulation proved to have good performance of this new principle in the 500KV and 750KV UHV transmission lines. K'' / K 'use of the principle of phase current differential protection program compiled a set of microcomputer. The principle of the protection device will not malfunction in the end CT disconnection peer protection does not start, it will not malfunction, by the delay in order to prevent external fault occurs protection malfunction, atresia of the end protection and channel lockout end protection. This saver has multiple modes of operation (ie, the \reliability; sampled value differential and the principle of combining to accelerate the protection action; using zero sequence overcurrent protection as backup protection at the same time to solve the high transition resistance ground fault main protection problem of inadequate sensitivity. Click principles of devices developed by the test with protective tester.

Related Dissertations

  1. Owned Power Plant Electrical Study Design Engineering,TM621
  2. Study on the Transmission Line Protection of the UHV Grid,TM773
  3. Research and Development of Microcomputer Protection and Monitor Equipment to Transformer of the First Station in QING DAO,TM772
  4. Research of Improving Measure and Action Analysis for the Abnormal Run Relay in Power Network,TM774
  5. Design of Protective Relay System Based on Arm+μc/os-ⅱ,TM774
  6. Application Research Microcomputer Protection of Zhaocun Substation,TM774
  7. Study for UHVDC Transmission Line Protection Based on Wavelet Transform,TM773
  8. Research of General Relay Protection Platform for Experiments,TM774
  9. Research on Simulation of Substation’s Microcomputer Protection,TM743
  10. Application Research on Microcomputer Protection System in Huzhuang Substation Transformation,TM774
  11. Research on the Relay Protection for Teaching Experiment Device Based on Embedded Computer,TM774
  12. Design and Development of 500kV Line Microcomputer Protection Remote Training System,TM773
  13. Parameter Identification Method Based on Line Protection Research,TM773
  14. Power System Automation Study in Fushun Petrochemical Company Ethylene Projects,TM76
  15. The Research of Two-Terminal Fault Location and Virtual Protection Based on Fault Record Data,TM855
  16. Research and Implementation of Line Protection Based on Integrated Protection and IEC61850,TM773
  17. Research on Anti-interference and Configuration of 35kV Oil Field Line Microcomputer Protection,TM774
  18. Study and Implement of the EMS Data Collection Service Based on Optical Line Protection,TP274.2
  19. The Research of Influence to the Line Protection and Bus Protection in Power System with Harmonics and Negative Generated by the Electrical Railway,TM773
  20. The Influence of Earthing Mode and Power Supply Mode on Microprocessor-based Protection Device,TM774
  21. The Research on the Transformer Microcomputer Protection in Power System,TM772

CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system protection > Protection devices
© 2012 www.DissertationTopic.Net  Mobile