Multi-parameter detection method of cable ablation defect based on characteristic gases with temperature and pressure variation
High voltage cable is an important part of power supply system.Buffer layer ablation can lead to power cable failure.In recent years,several cable accidents caused by buffer layer ablation have occurred.In order to solve the above problems,a multi-parameter detection method for cable ablation defects was proposed based on buffer layer ablation characteristic gases,temperature and pressure variation.The CH4,C2H6,and C2H4 content in the buffer layer was analyzed by Fourier transform infrared spectroscopy.The H2 content in the buffer layer was measured by electrochemical sensor.The temperature and barometric pressure in the buffer layer were measured by temperature sensor and piezoelectric barometric pressure sensor.The performance of the system was tested by laboratory buffer layer ablation experiment and actual cable detection experiment.The results show that the functionality and accuracy of the system meet the requirements,and the four characteristic gases content,temperature,and pressure can be used as the parameters to characterize the buffer layer ablation defects.The detection period of the system is less than 30 s,and the detection error is within±10%.The system has advantages in terms of safety,detection speed,and accuracy,which can guarantee the safe operation of power cables.
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维普
