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Power Quality Issues
Causes and Effects of Poor Power Quality
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Although this graph does not apply to all equipment, it
does apply to a vast amount of equipment in the
marketplace.
Causes and Effects of Poor Power
Quality
Causes of Poor Power Quality
Swells
• Shutdown of heavily loaded equipment
• Abrupt power restoration
• Utility switching
Sags
• Abrupt increase in load
• Dropouts/Outages
• Lightning
• Outdoor contact with transmission lines
• Ground Faults
• Equipment failures
• Acts of nature
Transients
• Switching loads on and off
• Utility switching
• Lightning
• Normal computer operation
• Fault clearing
• Power factor correction capacitors