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Power Quality Issues
Performing a Power Quality Study
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The following power conditioning suggestion chart is
useful for choosing an adequate protection device for
unrepetitive power line disturbances.
Transient/
Swell
Protector
Power Line
Filter
Uninterruptible
Power Supply
Transients X* X X
Swells X* X X
Sags X
Outages X
* Used only when transients and swells are moderate in
quantity or else damage may occur to the power protection
device.
When considering a protection device, make sure that it
covers the entire operating range. It is a waste of money
buying a protection device rated to remove transients of
up to 1000 volts if you have recorded transients of more
than this.
The difference between power line filters and protectors
is that filters can catch fast transients of high
magnitudes. Filters tend to be more expensive than
protectors.
The information you receive from your recorder will
enable you to make an informed decisions about
protection devices.
Please note that this appendix is not a comprehensive
study of power quality, nor does it attempt to provide all
solutions to power quality problems.
Power quality is a complex issue. It may be necessary
to make additional measurements such as: line current
levels, harmonic content, and distortion using other
power quality diagnostic equipment.