Zusammenfassung
Gapless a"esters using zinc oxide blocks of high stability are characterized by their maximum pennissible ·
continuous operating voltage. It is possible to use an a"ester with this voltage equal to 61 percent of the maximum
system voltage for applications in effectively earthed systems. Such an a"ester can withstand temporary overvoltages
of 1.5 p.u. for one second, while limiting switching surges to 1.85 p.u. and lightning surges to 2.2. p.u .. The
high energy absorption capability, the speed of response of these a"esters, as demonstrated by several tests, fulfill
the most stringent requirements.
Nutzer