Ieee std 1159-1995, ieee recommended Practice for Monitoring Electric Power Quality

Table 1ÑPrincipal phenomena causing electromagnetic disturbances
as classiÞed by the IEC
Conducted low-frequency phenomena
Harmonics, interharmonics
Signal systems (power line carrier)
Voltage ßuctuations
Voltage dips and interruptions
Voltage imbalance
Power-frequency variations
Induced low-frequency voltages
DC in ac networks
Radiated low-frequency phenomena
Magnetic Þelds
Electric Þelds
Conducted high-frequency 
phenomena
Induced continuous wave voltages or currents
Unidirectional transients
Oscillatory transients
Radiated high-frequency phenomena
Magnetic Þelds
Electric Þelds
Electromagnetic Þelds
Continuous waves
Transients
Electrostatic discharge phenomena
Ñ
Nuclear electromagnetic pulse
Ñ

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IEEE
MONITORING ELECTRIC POWER QUALITY
Std 1159-1995
11
For non-steady state phenomena, other attributes may be required [B10]:
Ñ
Rate of rise
Ñ
Amplitude
Ñ
Duration
Ñ
Spectrum
Ñ
Frequency
Ñ
Rate of occurrence
Ñ
Energy potential
Ñ
Source impedance
Table 1 provides information regarding typical spectral content, duration, and magnitude where appropriate
for each category of electromagnetic phenomena [B10], [B15], [B16]. The categories of table 2, when used
with the attributes mentioned above, provide a means to clearly describe an electromagnetic disturbance.
The categories and their descriptions are important in order to be able to classify measurement results and to
describe electromagnetic phenomena that can cause power quality problems. The remainder of this clause
will discuss each category in detail.