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Cause
Impulse transient
Oscillatory
transient with decay
Sag/swell
Interruptions
Under voltage/over voltage
Voltage flicker
Harmonic distortion
Table 1.3: Typical Power Quality Problems and Sources
It is often assumed that power quality problems originate with the utility. While it is
true that may power quality problems can originate with the utility system, many
problems originate with customer equipment. Customer-caused problems may
manifest themselves inside the customer location or they may be transported by the
utility system to another adjacent customer. Often, equipment that is sensitive to
power quality problems may in fact also be the cause of the problem.
If a power quality problem is suspected, it is generally wise to consult a power quality
professional for assistance in defining the cause and possible solutions to the
problem.
Electro Industries/GaugeTech
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
The Leader In Power Monitoring and Smart Grid Solutions
Disturbance Type
Transient voltage disturbance,
sub-cycle duration
Transient voltage, sub-cycle
duration
RMS voltage, multiple cycle
duration
RMS voltage, multiple
seconds or longer duration
RMS voltage, steady state,
multiple seconds or longer
duration
RMS voltage, steady state,
repetitive condition
Steady state current or volt-
age, long-term duration
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1: Three Phase Power Measurement
Source
Lightning
Electrostatic discharge
Load switching
Capacitor switching
Line/cable switching
Capacitor switching
Load switching
Remote system faults
System protection
Circuit breakers
Fuses
Maintenance
Motor starting
Load variations
Load dropping
Intermittent loads
Motor starting
Arc furnaces
Non-linear loads
System resonance
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