| Traction substation is the core of electrified railway, charging with the task of substation and distribution. The insulation condition of high-voltage equipment is directly related to electric railway’s operation. Therefore, as important traction substation equipment, wall bushing’s condition monitoring is very important. Currently, on-line monitoring equipment used in substation is very few. Despite the infrared camera online monitoring system is effective in recent years, it is difficult to be used in the nationwide because of the high price. Therefore, a method using infrared sensors to monitor temperature and then predict equipment failure was proposed, greatly reducing the cost of monitoring system and being promoted easily.Firstly, the wall bushing’s structural was analyzed in the dissertation, the relationship between equipment faults and surface temperature anomalies was found, and the reasons of the wall bushing exploding was elaborated. By ANSYS simulation, the dissertation verified that the front connecting portions were the extremely temperature sensitive areas, and made the conclusions about testing the connecting portions temperature could monitor the wall bushing failure.Secondly, the principles and characteristics of infrared surface temperature thermometry was further studied, and the dissertation summed up the temperature measurement methods and procedures, and designed infrared temperature measurement hardware system. By referring to standard GB/T 11022-2011, the dissertation determined relationship between surface temperature and the corresponding level fault diagnosis.Finally, by using laboratory equipment and test panels made in this study, hardware parameters was tested and debugged, determining the optimal parameters of the system components. the dissertation also did the experiments about the accuracy of the results impact of the ambient temperature, monitoring distance or monitoring angle, and the conclusions were: ambient temperature compensation basically no influence on the test results, test distance coefficient ratio can not exceed D: S range, and the test angle must be re-calibrated if it’s changed. |
