Non-sustained disruptive discharge（NSDD）is a voltage breakdown after the vacuum circuit-breaker open the fault current which will not cause the recovery of power frequency current. Restrike is different from NSDD

the recovery of power frequency current between the contacts will make the breaker failed. It’s not easy to show the distinction between NSDD and restrike during some type tests. Clear appraisal procedure isn’t given in the relevant standard. By calculating the process of break-down in single phase capacitive circuit and substitute circuit for non-effectively earthed systems during three-phase capacitive current switching test

and analyzing the character of the vacuum circuit-breaker during the capacitive current breaking

finally

this paper shows the distinction and give an example between NSDD and restrike in effectively earthed neutral systems and also in noneffectively earthed systems for three-phase capacitive current switching test. By analyzing the viewpoint developing about NSDD in both domestic and foreign standard

this paper gives the clear explanation about NSDD in the guide

It’s an important supplement for the national standard and STL guide.