Simulation on interface mechanical stress in porcelain insulators for transmission line by cement growth using ANSYS/NASTRAN program

The main ageing cause of many porcelain suspension insulators for transmission and distribution line with dead-end stings is a mechanical stress in interface between porcelain and cement materials. It was known that the principal mechanical stresses which give electrical failure is the results of the displacement from cement growth. We studied the effect of cement displacement resulting environmental ageing parameters on porcelain insulator mechanical properties used by analytical simulation program (ANSYS/NASTRAN) and test methods. For alumina porcelain samples, an expansion above 0.2% at 5,000 kg load is predicted to cause fracture. These simulation methods using ANSYS/NASTRAN program is very correct to experiment results. These simulation analysis and experimental results show that cement volume growth affects severely to be mechanical failure ageing.