©2002 Advanced Protection Technologies, Inc. All rights reserved
Clarification of the Actual
IEEE says that the largest transient that can enter a
distribution system is about 20kV and 10kA.
Voltages higher than about 6kV flash over
inside the gear because of small dielectric
air gaps between bus bars & ground.
(BIL is exceeded.)
Shorted driving voltage limits
“Ultimate” transients short out
‘More begets less’
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