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Power cable water tree -line detection of new methods of

Author: ZhouXiu
Tutor: ZhouLiXing
School: Changsha University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: XLPE Power Cable Water tree AC superposition method Chaos Theory
CLC: TM247
Type: Master's thesis
Year: 2011
Downloads: 105
Quote: 0
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Abstract


With the rapid development of power industry , XLPE cables are widely used in power systems . In recent years, cross-linked polyethylene cable insulation failures have occurred, a serious threat to security and stability of the grid . Therefore, in-depth study XLPE insulation degradation mechanism , online monitoring XLPE insulation status of the smart grid construction is important. This paper , based on research at home and abroad , focusing on the cross-linked polyethylene cable insulation aging mechanisms and the formation of water trees and water tree deterioration of the cable insulation characteristics ; and existing water tree XLPE line detection methods are described and compared. Based on the nonlinear characteristics of water trees , water trees established power cable Matlab simulation model, using the model XLPE AC superimposed water tree detection method was simulated . The results showed that: the cable shield superimposed on the AC voltage of 50V ( frequency of 101Hz) can be detected by the small frequency of 1Hz current characteristic , and the characteristic deterioration of the current increases with the water tree . Statistical regularities obtained by simulation and experimental results indicate that the exchange overlay assay feasibility of water trees . Weak characteristic for the current scene is difficult to detect , on-line inspection system with low sensitivity difficulties , this paper presents the chaos control theory is applied to XLPE water tree detection . Duffing chaotic oscillators for use with cycle driven weak periodic signal with frequency sensitive , while the larger frequency difference signal and noise immunity characteristics of the specific structure of chaotic systems to measure the signal as a chaotic oscillators cycle driven disturbance , to achieve accurate measurement of characteristic signals 1Hz to enable monitoring system can effectively detect the tiny XLPE water tree defects , simulation and experimental results show that the method is effective. For XLPE cable insulation monitoring with engineering significance.

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Conductive materials and their products > Power cable
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