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Power Quality Basics
Current Power Supply Environment
Power Quality Standards
Various factors can contribute to worsening power quality
International
Power Quality
Deterioration
Open market
Tough competition to
cut costs
Increase use of PCs
and inverter devices
Connection with new
energy sources (wind,
solar, gas turbine, etc.)
Connection with on-
site power supply
Connection
mixes the
different
power
characteristics
Europe
U.S.A.
Standard Title Published Comment
IEC
61000-4-7
IEC
61000-4-15
IEC
61000-4-30
EN50160
IEEE 1159
IEEE 519
IEEE 446
ANSI C84.1
General guide on harmonics and inter-
harmonics measurements and
instrumentation, for power supply systems
and equipment connected thereto
1991
2002 revised
Actualization of inter-
harmonic concept (from
revision)
Flicker meter - Functional and design
specifications
Testing and measurement techniques
Power Quality measurement methods
1997
2003 A1
2003
120V/60Hz added in
amendment
New standard
Standard Title Published Comment
Standard Title Published Comment
Voltage Characteristics of electricity
supplied by public distribution systems
1995,
1999 revised
General power quality
standard
IEEE Recommended Practice for
Monitoring Electric Power Quality
IEEE Recommended Practice and
Requirements
IEEE Recommended Practice for
Emergency and Standby Power Systems
for Industrial and Commercial Applications
Electrical Power Systems and Equipment -
Voltage Ratings (60Hz)
1995
1992
1995
1995
Anomaly voltage
Classification of basic
terms
Standards for harmonic
limit values
Describes the CBEMA
curve
Voltage limit values
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