Study And Application About10kV Cable PD OWTS

The partial discharge is a harbinger of the cable insulation failure, the effective detection of partial discharge is an important way to improve the status of cable maintenance level. The OWTS partial discharge detection technology is an emerging in recent years cable defect detection technology that can effectively detect and point of failure for precise positioning of on-site cable partial discharge.Currently, the use of10kV cable OWTS partial discharge detection system, there are two key technical issues, interference in the process of partial discharge detection, and identification of the type of partial discharge defects. First, in order to meet the portability requirements under field test conditions, OWTS partial discharge detection system will be oscillating high pressure part and partial discharge detection part of the integration as a whole, strong power system electromagnetic interference problems, especially for weak systems, resulting in localized discharge detection sensitivity is low. Secondly, the10kV cable OWTS partial discharge detection system in the analysis of partial discharge data can only be based on the traveling wave principle of the location of defect points, cannot be detected partial discharge signal statistical characteristics of The exact cause of the statistical characteristics of data cannot identify the defect types on the basis of known defects position, resulting in the assessment of the insulating state of the cable under test is not comprehensive.In-depth analysis on the basis of the principle of the OWTS detection system interference, shielding, filtering and grounding measures, inhibit the body discharges, background noise and external interference, greatly improving the anti-jamming performance of the system as a whole. Next, analyzed the OWTS partial discharge detection mode signal characteristics of the particularity, the effect of the oscillating voltage signal statistical characteristics of partial discharge data analysis algorithms, and integration with existing traveling wave location algorithm, extends the OWTS Partial Discharge Detection System data analysis software with features, and laid the foundation for the identification of defect types, and further improve the OWTS partial discharge test system.To address anti-jamming and data analysis, building up at the OWTS partial discharge detection system.10kV cable partial discharge test platform, set in a400m long cable the middle connector of the defects, the10kV cable OWTS partial discharge detection and location test on this platform. Comparison test with the German the SEBA M28the OWTS partial discharge tester, that developed the OWTS partial discharge detection system sensitivity and defects in positioning accuracy of not less than SEBA M28the OWTS partial discharge tester, the system gives the defect local discharge characteristic spectrum and phase characteristics, and laid the foundation for the identification of defect types.