Analysis Of Self-Shattering Of Toughened Glass Insulator In 500kV Die Ling Station

500kV Die Ling Station has been put into operation since the end of 2008,the frequent occurrence of toughened glass insulator phenomenon,caused great pressure on the safe operation of power grid.Toughened glass insulator mainly because the stress balance is destroyed,internal stress caused by the destruction of balance the possible reasons are: 1,due to influence of glass insulators by electric field,filthy,around the steel legs,gossan local produce tiny and concentrated discharge,the toughened glass insulator.2,toughened glass insulators by iron and steel Wo connected in long-term by gravity,wind,iron feet root near the glass part because of stress concentration,the cementing part of micro cracks,leading to insulator internal stress balance destruction 3,in the manufacturing process of nickel sulfide(NiS)is introduced.The process of nickel sulfide gradually transition caused by unbalanced stress.The statistical data of toughened glass insulators blew from the Die Ling station according to the preliminary analysis,combined with the domestic and foreign research blew toughened glass insulator results,the use of ANSYS simulation software in electric field and stress field in two aspects of toughened glass insulator by electric field and may not be caused by external forces,that is to say with the electric field should the force field simulation results can not prove that the insulator is caused by these two factors.In addition,we collected some broken pieces of glass insulators,Ni component analysis,the result is no detectable Ni component does not exist NiS without evidence of Die Ling station toughened glass insulator is the toughened glass containing NiS initiator.