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2. Terms and definitions1 # Voltage Sags and Interruptions.

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Presentation on theme: "2. Terms and definitions1 # Voltage Sags and Interruptions."— Presentation transcript:

1 2. Terms and definitions1 # Voltage Sags and Interruptions

2 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

3 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

4 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)

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