Cause Analysis and blew glass insulators to determine: 

1) glass containing impurities and nodulation, if the distribution of the inner tension layer can occur 30 to 60 days, blew in a short time, you can determine the reason for the manufacture blew.

2) the operation of the steel due to the presence of impurities, the distribution of the outer layer of tension, that is, in hot and cold temperature condition, especially when suddenly cooled, and in a stable mechanical load, in 1 to 2 years blew occurs, it can determine the operating status It blew down quality reasons.

3) Run the glass insulator surface area due to severe pollution, caused by damp after partial discharge or monolithic creepage cause fever, caused by insulation deterioration, occurred blew blew a zero value can be determined.