Study on the Modification of Environmental Friendly Nylon Insulating Material for Medium Voltage Switchgear
ZHANG Yonggang ,LU Jun
（Jiangsu NARI Power Electric Co. ,Ltd. ,Nanjing 211100 ,China）
PA66(polyamide 66/nylon66) ;PA6T6I (polyamide 6T6I) ;medium – voltage switchgears ;insulating parts ;thermoplastic insulating material
Due to its own performance advantages and environmental protection value，fiber-reinforced PA66 com- posite material has been applied in insulating parts of medium-voltage switching equipment in recent years. Howev- er，compared with epoxy insulating material，it still has a large performance distance. Based on the performance re- quirements of the medium-voltage switch equipment，we use the high-performance aromatic PA6T6I as the modified material to study the performances of the different mix ratio formula of PA66 and PA6T6I is 3:7，5:5 and 7:3. The mod- ification formula with the pure PA66 and epoxy basic physical properties are compared by testing their mechanical and electrical properties，long-term electric-heat aging property and creep characteristic. The results show that the formula with a mixing ratio of 5：5 has better comprehensive performance and will be an ideal alternative insulation material.