Dranetz PowerGuide 4400 - Page 250

F-2
Event Classification, continued
Range of
Variations as per
IEEE, IEC, and
Dranetz
(continued)
Continued on next page
IEEE 1159 IEC 61000-4-30
(deviations from IEEE
1159 only are noted)
Dranetz
Transients
Impulsive
Oscillatory
Medium
Frequency
frequency range
duration
magnitude
no more than one
transition in each
direction
ringing freq following
initial transition
5 - 500 KHz
20 us
0 - 8 pu above Vnom
IEC classification for
transients are
undefined, as of
version approved in
2003.
Peak - absolute
value from zero axis
Width - time
between 50% of
peak rise and fall
Duration - total time
of waveshape
trigger
Rise - time between
10% and 90% of
peak
Fall - time between
90% and 10% of
peak
Direction:
Positive - adds
energy to curve;
Negative - subtracts
energy from curve
Ring frequency -
dominant between
2nd and 128th
harmonic
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