| Ring network cabinet is installed in the annular outlet switchgear in the distribution network,a part of the outgoing switchgear bus and ring line,with its simple structure,reliable operation,low maintenance,small amount of operating costs.At present,the distribution of the ring cabinet is very extensive in our country.Ring network cabinet is an important control point of urban power supply system,its stable operation is related to the reliability of urban power supply system.The ring network cabinet need long-term operation,has been in a loaded state,and in the cabinet space is narrow,limited ventilation,cable joint temperature is easy,not timely disposal may cause fire and explosion accidents.Therefore,in order to ensure the safe operation,it is very important to detect the cable joint temperature in the ring network cabinet.In this paper,the current research status of infrared thermography,thermal resistance and optical fiber are introduced,and the advantages and disadvantages of each method are analyzed.On this basis,a detailed study of the principle of optical fiber temperature measurement based on fluorescence lifetime,the combination of wireless communication completion of the ring cable joint temperature on-line detection using fluorescence optical fiber temperature sensor program,developed a fluorescence optical fiber temperature measuring system of cable ring network cabinet.The system can measure the true temperature of the cable joint,solve the insulation problem in the temperature detection of the ring network cabinet,and the data transmission problem of the dispersed outdoor ring network cabinet.Finally,the test platform was established in the laboratory,and the temperature rise test was carried out.The experimental results show that the system can accurately detect the true temperature of the cable joint,and timely reflect the temperature change of the cable joint in the ring network cabinet,so as to ensure the safe operation of the power system. |
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