
F-2
Event Classification, continued
Range of
Variations as per
IEEE, IEC, &
Dranetz
(continued)
Continued on next page
IEEE 1159 IEC 61000-4-30
(deviations from IEEE
1159 only are noted)
Dranetz
Transients
Impulsive
Oscillatory
High Frequency
frequency range
duration
magnitude
Medium
Frequency
frequency range
duration
magnitude
Low Frequency
frequency range
duration
magnitude
no more than one
transition in each
direction
ringing freq following
initial transition
0.5 - 5 MHz
5 us
0 - 4 pu above Vnom
5 - 500 KHz
20 us
0 - 8 pu above Vnom
1/2 cycle - 5 KHz
0.3 - 50 ms
0 - 4 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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