2. Terms and definitions1 # Voltage Sags and Interruptions.

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Presentation transcript:

2. Terms and definitions1 # Voltage Sags and Interruptions

Motor contactor drops out, motor stops Motor continues to run ASD control drops out, motor stops ASD continues to run Typical voltage sag ride-through Duration in cycles ITI Curve Voltage in percent

Industrial Power System 115 kV 13.8 kV TRANSMISSIONDISTRIBUTION Sensitive Load Other distribution circuits Area of Vulnerability for Motor Contactors Area of Vulnerability for Adjustable Speed Drives

Reliability Indices SAIFI (system average interruption frequency index) SAIDI (system average interruption duration index) CAIFI (customer average interruption frequency index) CAIDI (customer average interruption duration index)