Dissertation > Excellent graduate degree dissertation topics show

Development of an Instrument in Partial Discharge Detector Based on Ultrasonic

Author: ZhangDeNing
Tutor: ZhangShuGuang
School: Agricultural University of Hebei
Course: Agricultural Electrification and Automation
Keywords: Partial Discharge Ultrasonic Sensor High-speed AD Converter STC89C52 Serial Communication Wavelet Transform
CLC: TM835
Type: Master's thesis
Year: 2009
Downloads: 281
Quote: 0
Read: Download Dissertation

Abstract


Electrical equipment are important equipment in power system and power transmission line is the key part of the power system. It has important significant to make fault detection and diagnosis on electrical equipment and power cables, detect the hidden accidents of electrical equipment and power cable in time, prevent accidents, and improve the safe reliability of running electrical equipment. With the continuous improvement of voltage and the effect of the high-voltage and high electric-field, partial discharge will occur in some insulation weaknesses of the electrical equipments and power transmission line. Therefore it has realistic meaning of development a partial discharge detection equipment to realize the on-line detection of electrical equipment and power cables. This issue is raised based on this demand.In this thesis, partial discharge detector based on the ultrasound is researched and designed systematically. It has features of small size, convenient using and portable.Partial discharge detector, which uses the STC89C52 single-chip microcomputer as the core, can complete the detection of partial discharge, high-speed data acquisition and storage, discharge alarming, discharge intensity shows and communication with the host computer, etc. In the hardware design, the issue adopts the idea of modular design. First it chooses the ultrasonic sensor in accordance with the mechanism of partial discharge and the ultrasonic character and its propagation rules. In order to ensure the safety and reliability of the detector, it designs the photoelectric isolation circuit module, which realizes the strong and weak electricity power isolation with the optical transmission method. In the analog signal pre-processing unit and sampling trigger circuit design part, it completes the design of amplifier, band-pass filter circuit, sampling trigger circuit. In the high-speed data acquisition modules part, it mainly completes high-speed data collection and its storage. Because the speed of single-chip can not keep up with the sampling rate of ADC, it designs 20-bit address generator with the hardware to complete the storage of high-speed data. At the same time it completes the design of the discharge display circuit, alarm and reset circuit. RS485 interface realizes the communication with the host computer and ensures the communication distance and the noise immunity. In order to analyze the relationship between the ultrasonic signal and the discharge, eliminate noise interference and accurately extract the partial discharge pulse signal, it introduces the extraction method of discharge signal using the wavelet transform. Finally, it makes prospects at the partial discharge detector and proposes some methods of thinking from several aspects to do further research and improvement of the system.The partial discharge detector can make on-line detection of partial discharge of the electrical equipment and power transmission lines quickly and easily, collect and process the data of the partial discharge signal. Therefore it greatly reduces the outage time and saves reconditioning expense, which has a good application prospects.

Related Dissertations

  1. Feature Extraction, Selection and Combination in Lipreading,TP391.41
  2. Design of High-Speed Digital Image Acquisition and Interface Based on FPGA,TP274.2
  3. Development of Serial Bus Analyzer Based on Nios,TP274
  4. Study on the Mechanism of Partial Discharge Emitting Ultrasonic Wave and Propagation Property Within Power Transformers,TM855
  5. Research on Identification System of Cashmere and Wool Fiber,TS101.921
  6. Intrusion detection based on the ultrasonic echo envelope in the military security patrols,E919
  7. Characteristics of sensory stimulation evoked,R318.0
  8. Network transmission ROI image coding algorithm,TN919.81
  9. CAN bus technology in the meteorological monitoring System Research and Implementation,P409
  10. Image Fusion Algorithms Based on Multi-scale Analysis,TP391.41
  11. Feature Extraction Technologies Research and Implementation of 3D Models Based on Wavelet Transform,TP391.41
  12. An Algorithm on Clustering and Anomaly Detection for Multiple Data Streams,TP311.13
  13. Research on Information Hiding Based on Images,TP309.7
  14. Design and Implication of Image Compression System Based on Wavelet and DM6446,TP391.41
  15. Combined DWT Dynamic Data Reconciliation Research and Application,TP274
  16. Design of Digital Intelligent Terminal System Doorstation,TP368.1
  17. Traffic Prediction Model Based on Wavelet and Markov,TP393.06
  18. The Study of Image Watermark Base on Discrete Wavelet Transformation,TP309.7
  19. The Compression and Application of the Brain CT Image,TP391.41
  20. Inspection and Recognition on a Class of Tool Processing Trace,TP391.41
  21. Based on the design and simulation of the ADuC845 strain test data acquisition software,TP274.2

CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > High voltage test equipment and measurement techniques > High - voltage measurement technique
© 2012 www.DissertationTopic.Net  Mobile