环网柜可分离连接器绝缘故障模拟及典型气体释放规律研究

Research on Insulation Failure Simulation and Typical Gas Release Law of Detachable Connectors in Ring Cabinet

摘要: 为更好的实现气体组分分析法在环网柜绝缘状态预测评估这一领域的应用，本文对环网柜可分离连接器绝缘故障模拟及典型气体释放规律进行研究。实验对环网柜可分离连接器典型绝缘故障进行模拟，包括可分离连接器装配不到位、套管与可分离连接器之间有金属丝、套管表面有凹陷、可分离连接器内表面有凹陷，同时选取非甲烷总烃、氢气、一氧化碳作为监测目标物。得出如下结论：环网柜可分离连接器典型绝缘故障模拟过程中会生成氢气、一氧化碳、非甲烷总烃气体；氢气、一氧化碳、非甲烷总烃气体浓度大小以及变化规律存在差异；试验箱内部位于可分离连接器上方的传感器氢气数值远大于下方传感器数值。试验箱内部气体浓度位于可分离连接器下部的一氧化碳传感器数值大于上部传感器数值；在可分离连接器装配不到位、套管表面有凹陷、可分离连接器内表面有凹陷绝缘故障模拟过程中，试验箱内部气体浓度位于可分离连接器下部的非甲烷总烃传感器数值大于上部传感器数值，在套管与可分离连接器之间有金属丝绝缘故障模拟过程中，试验箱内部气体浓度位于可分离连接器下部的非甲烷总烃传感器数值小于上部传感器数值。

Abstract: In order to better realize the application of gas component analysis method in the prediction and evaluation of ring cabinet insulation state, this paper studies the insulation fault simulation and typical gas release law of the detachable connector of ring cabinet. Typical insulation failures of detachable connectors in ring cabinet were simulated in the experiment, including the assembly of detachable connectors was not in place, there were metal wires between the sleeve and the detachable connector, there were dents on the surface of the sleeve, and there were dents on the inner surface of the detachable connector. At the same time, non-methane total hydrocarbons, hydrogen and carbon monoxide were selected as monitoring targets. The following conclusions are drawn: Hydrogen, carbon monoxide and non-methane total hydrocarbon gases are generated during the typical insulation failure simulation of the detachable connector of the ring cabinet. There are differences in the concentration of hydrogen, carbon monoxide and non-methane hydrocarbon gases. The hydrogen value of the sensor above the detachable connector inside the test chamber is much greater than that of the sensor below it. The carbon monoxide sensor with the gas concentration in the test chamber located at the lower part of the separable connector is greater than the upper part of the sensor. In the insulation fault simulation process where the assembly of the detachable connector is not in place, the casing surface is concave, and the inner surface of the detachable connector is concave, the value of the non-methane total hydrocarbon sensor whose gas concentration in the test chamber is located at the lower part of the detachable connector is greater than the value of the upper sensor. In the insulation fault simulation process where there is wire between the casing and the detachable connector, the non-methane total hydrocarbon sensor with the gas concentration in the test chamber at the lower part of the separable connector is smaller than that at the upper part.