Power quality issues significantly impact building operations, with voltage sags and under voltage conditions accounting for 92% of all power quality problems in commercial and industrial settings. A voltage sag occurs when voltage briefly drops below 90% of its nominal value, lasting between 0.5 cycles and one minute. When this reduction extends beyond one minute, it's classified as under voltage.
While under voltage typically stems from external factors like weather conditions or high power demand, voltage sags can originate both internally and externally. Common internal causes include sudden load increases, motor startups, short circuits, or loose connections causing increased source impedance. In facilities with chronic under voltage, even minor sags can amplify existing power quality issues.
To protect sensitive electronic equipment, local or central Uninterruptible Power Supply (UPS) systems are recommended. However, managing power quality for larger equipment like motors and HVAC systems requires additional measures. Effective management includes monitoring to identify problem sources and configuring protective features in equipment like Variable Frequency Drives (VFDs). For external power quality issues, facilities should work directly with their utility providers for resolution.
Omni Instrumentation and Electrical Services is a world class instrumentation and electrical contractor. We look to provide total care solutions for all of our clients' needs. Please contact us at 908-412-7130.
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