Rockwell Automation 1426 PowerMonitor 5000 Unit - Manual (Page 81)

Rockwell Automation Publication 1426-UM001F-EN-P - November 2013 81
Power Quality Monitoring Chapter 5
Power Quality Event
Classification (M6 model) IEEE 1159-2009, Recommended Practice for Monitoring Electric Power
Quality, categorizes various power quality events based on the parameters of the
event such as voltage change, frequency content, rise time, event duration, etc.
The table below, excerpted from the standard, summarizes the classifications in
the recommended practice.
IMPORTANT Table 14 is excerpted from standard IEEE 1159-2009 and is used with
permission.
Table 14 - Categories and Typical Characteristics of Power System Electromagnetic Phenomena
(1)
Categories Typical Spectral Content Typical Duration Typical Voltage Magnitude
1.0 Transients
1.1 Impulsive
1.1.1 Nanosecond 5 ns rise < 50 ns
1.1.2 Microsecond 1
μs rise
50 ns - 1 ms
1.1.3 Millisecond 0.1 ms rise > 1 ms
1.2 Oscillatory
1.2.1 Low frequency < 5 kHz 0.3-50 ms 0-4 pu (2)
1.2.2 Medium frequency 5-500 kHz 20 μs 0-8 pu
1.2.3 High frequency 0.5-5 MHz 5 μs 0-4 pu
2.0 Short-duration root-mean-square
(rms) variations
2.1 Instantaneous
2.1.1 Sag 0.5-30 cycles 0.1-0.9 pu
2.1.2 Swell 0.5-30 cycles 1.1-1.8 pu
2.2 Momentary
2.2.1 Interruption 0.5 cycles - 3 s < 0.1 pu
2.2.2 Sag 30 cycles - 3 s 0.1-0.9 pu
2.2.3 Swell 30 cycles - 3 s 1.1-1.4 pu
2.3 Temporary
2.3.1 Interruption >3 s - 1 min < 0.1 pu
2.3.2 Sag >3 s - 1 min 0.1-0.9 pu
2.3.3 Swell >3 s - 1 min 1.1-1.2 pu
3.0 Long duration rms variations
3.1 Interruption, sustained > 1 min 0.0 pu
3.2 Undervoltages > 1 min 0.8-0.9 pu
3.3 Overvoltages > 1 min 1.1-1.2 pu
3.4 Current overload > 1 min
4.0 Imbalance
4.1 Voltage steady state 0.5-2%
4.2 Current steady state 1.0-30%
5.0 Waveform distortion
5.1 DC offset steady state 0-0.1%