Dissertation > Excellent graduate degree dissertation topics show

Study on the Mathod of Transformer Inrush Current Inhibition Based on Estmated Flux in Core before Reclosing

Author: ZhouJianPing
Tutor: LuoJian
School: Chongqing University
Course: Electrical Engineering
Keywords: Inrush current Synchronous Closing The initial flux Tripping angle Closing angle
CLC: TM41
Type: Master's thesis
Year: 2009
Downloads: 126
Quote: 2
Read: Download Dissertation

Abstract


Power transformer is very important in power system electrical equipment. In its load closing time may be due to saturation of the core, windings appear several times the size of the rated current inrush current for system operation, safety equipment and protective action will have a tremendous impact. This thesis is anchored in this practical problems, to carry out research inrush current. The current variety of power transformer inrush identify the principles and methods, there are theoretical flaws, or is still in the experimental stage, needs to be further improved reliability and availability and so on. In this paper, surge suppression research direction, combining the transformer structure, working principle, analyzes the load switching single-phase transformer core inside \transient process, pointed out the phase selection technique airdrop transformer basic principles. In principle, the further analysis of synchronous closing airdrop transient three-phase transformer, three phase transformer phase selection technique airdrop three closing strategies (while closing, fast closing and delay closing) and improved Synchronous Closing airdrop transformers programs. More than just \Proposed above various surge suppression program has one thing in common: that is need to determine the initial flux within the core before closing. This parameter is critical, but also the focus of this study and the difficulty lies. Papers to complete the main work and research achievements as follows: ① papers in the understanding of domestic and foreign transformer inrush current on the latest case, the transformer load switching transient and surge suppression various programs conducted in-depth theoretical analysis; ② initial flux detection for the difficulties of the transformer, the paper proposes closing angle according to the voltage and current saturation time before closing the initial flux estimation method, since the required parameters can be measured, the estimation method is feasible; ③ initial paper on the proposed transformer flux estimation methods, dynamic model physical systems in the laboratory physics simulation experiments carried out to obtain the initial flux and current transformer core sub-gate angle and amplitude of the curve; ④ based on initial magnetic transformer core Through the current sub-gate angle and amplitude of the curve, the best thesis of the transformer closing strategy; regardless of whether the three-phase transformer core has an initial flux, can find an optimal closing angle, in this Meanwhile closing phase angle, winding will produce minimal inrush current.

Related Dissertations

  1. The Research on Identification of Transformers Inrush Current Based on Wavelet Theory and Ratio Analysis,TM407
  2. Fuzzy Identification Method of Transformer Inrush Current,TM407
  3. Study on Synchronous Closing Technology of Circuit Breaker,TM561
  4. Research on Explosive-proof Intelligent Vacuum Feed Switch Based on Permanent Magnetic Actuator,TM564
  5. Permanent Magnetic Vacuum Circuit Breaker Online Monitoring and Synchronous Closing,TM561.2
  6. Investigations on Controlled Switching of Power Transformer,TM41
  7. Research on Differential Protection of Transformers Based on Artificial Neural Network,TM772
  8. Study on Novel Principles and Algorithms of Power Transformer Main Protection,TM772
  9. The Fuzzy Diagnosis of the Transformer Inrush Current Based on the Multi-criterions,TM407
  10. Power transformer inrush analysis of a number of issues,TM772
  11. Research of New Main Protection of Transformer,TM407
  12. Sample values ??based correlation and magnetizing inductance Transformer Protection Principle,TM407
  13. Wavelet-based digital transformer protection and realization of theoretical research,TM407
  14. Three-Phase to Two-Phase Traction Transformer Protective Principle,TM922.73
  15. Application of Self-Adaptive Technology in Transformer Differential Protection,TM77
  16. Novel Wavelet Approach to Transformer Differential Protection,TM77
  17. Research of the New Protection of Transformer in Order to Distinguish the Inrush and Fault Current of That,TM407
  18. Study on Inrush Current and Stead-State Operation Simulation of the Scott Transformer with Secondary Midpoint Drawn-Out,TM407
  19. The Analysis of PIN Diode Avalanche Characteristic,TN312.7
  20. Simulation and transformer inrush Recognition Algorithm,TM407

CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Power transformers
© 2012 www.DissertationTopic.Net  Mobile