Dissertation > Excellent graduate degree dissertation topics show

Rapid Detective Method for Water-tree Retardant XLPE Power Cables

Author: HuWenJia
Tutor: DuBoXue
School: Tianjin University
Course: Electrical Engineering
Keywords: WTR-XLPE Power Cable Rapid Detection Water Tree Broadband Dielectric Spectroscopy Oxidation Induction Time AC BreakdownVoltage
CLC: TM247
Type: Master's thesis
Year: 2012
Downloads: 4
Quote: 0
Read: Download Dissertation

Abstract


Cross-linked polyethylene (XLPE) power cable is widely used in urbantransmission and distribution network, due to its excellent electrical performance andtransmission capacity, good heat resistance, easy to be bend and fixed. The electricalproperty of the XLPE insulation material is extremely advantageous in dry condition.However, the XLPE power cable will be deteriorated affected by factors of electricity,heat, moisture, mechanical stress and chemistry when it is put into operation.Particllarly, the water trees will initiate in insulation influenced by the combination ofelectric field and moisture. Once generated, the electric field strength will be focusedon the tip of water trees which finally convert into electrical trees. Electrical trees maylead to the insulation breakdown in short terms and be in accident, which seriouslyendanger the reliability of the power grid.The literature on water tree resistant method in XLPE insulation is vast. Thesestudies proceed in two major areas to inhibit the generation and development of thewater trees. One is to mix water tree resistant additives into XLPE insulation material,and improve its water tree retardant properties. The other is to design a new powercable structure to prevent the incursion of moisture into the XLPE insulation.However, there is no complete set of experimental system or testing standard for therapid detection of water tree retardant cross-linked polyethylene (WTR-XLPE) powercables.Samples used here is XLPE and WTR-XLPE insulation sheet with1±0.1mm inthickness and25mm in diameter. And they were aged in1.0N NaCl conductivesolution and under10kV test voltage for120and240hours. After water treeing test,all the samples were tested by broadband dielectric spectroscopy, differential scanningcalorimetry, Fourier transform infrared spectroscopy, as well as power frequencyvoltage withstand test. By analyzing the results, an experimental system of rapiddetection for WTR-XLPE power cables is obtained. The operation of this testingmethod is as follows:1. Use the broadband dielectric spectrometer to test the dielectric loss-temperature spectrum of the insulation with condition of0.1Hz and temperature changing from45℃to70℃. Test the dielectric loss-frequency spectrum at roomtemperature and under frequency changing from0.1Hz to10Hz. The dielectric loss ofWTR-XLPE insulation shows a rapid increase with the increasing of testingtemperature and aging time.2. Repeatedly test the Oxidation Induction Time (OIT) of the insulation withsame weight by the DSC: the OIT of WTR-XLPE insulation is influenced less bywater tree aging degree.3. AC withstand voltage test the breakdown voltage of the insulations underworking frequency, and the pressure resistance duration. The drop level of these twoparameters of WTR-XLPE insulation is smaller than XLPE insulation.

Related Dissertations

  1. Studies on Rapid Measurement System of Rice Exterior Quality and Its Application,S511
  2. Rapid Evaluation Methods and Analysis Program Development of the Bearing Capacity for Reinforced Concrete Girder Bridge,U441
  3. Selection and Match of Rapid Detection Equipment in Small and Medium Span Bridge,U446
  4. Preparation of Monoclonal Antibodies against Cadium Ion and Study on the Immunological Characteristics,X830
  5. Study on Detection Technology of Irradiated Mushroom and Tea,TS207.3
  6. The Rapid Detection of Technology of the Nitrite and Sulfite in Pickled Potherb Mustard,TS255.7
  7. Validation about DY5000 Rapid Determination Methods for Poisonous and Harmful Materials of Agricultural Products,S859.84
  8. Preparation of Monoclone Antibody and Establishment of Immunology Rapid Test Method of Olaquindox,S859.84
  9. Detection of E. coli in Water New Method,R123.1
  10. Investigation on Blood Supersession in Jinan Area and Research on the Countermeasures,R197.6
  11. Research on the Rapid Detection of the Microorganisms in Green Livestock and Poultry Products,TS251.7
  12. Study on the Bacterial Luciferase Bioluminescent System in Vitro and Its Application in Detection of Pathogenic Bacteria in Fishery Products,TS254.7
  13. PCR Technology for Rapid Detection of Beer-spoilage Baeteria,TS262.5
  14. Studies on the Rapid Detection Technology of Pathotypes of Cotton Verticillium Dahliae,S435.62
  15. Study on Rapid Detection of Vibrio Cholerae by Loop-Mediated Isothermal Amplification,R440
  16. Study of Infrared Model on Rapid Detection of Five Fatty Acids in Milkfat,TS252.7
  17. Study on Rapid Detection Slip of Total Bacteria and Coliform Bacteria,TS207.4
  18. Rroutine Investigation of Vibrio Parahaemolycus and Detection of 3 Kinds of Vibrio Parahaemolycus by Loop Mediated Isothermal Amplification (LAMP),R155.3
  19. Rapid detection of coliform bacteria in milk,TS252.7
  20. The Implementation of Grain Quality Rapid Measurement System,TS210.7
  21. The Research on Rapid Detection of the Main Components and Freshness of Rice by Near Infrared Spectroscopy,TS210.7

CLC: > Industrial Technology > Electrotechnical > Electrical materials > Conductive materials and their products > Power cable
© 2012 www.DissertationTopic.Net  Mobile