Motor Protection Principles.pdf

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Motor History & Facts • The first U.S. patent for a motor was issued to Thomas Davenport in 1837. • Today in North America, more than 1 billion motors are in service. • Motors consume 25% of electricity in North America. • In 1888, Nikola Tesla patented the first AC poly-phase motor. • Electricity consumption by motors in manufacturing sector is 70%. In oil, gas and mining industries around 90%. • Three phase squirrel-cage induction motors account for over 90% of the installed motor capacity. 2
Various Industry Motor Applications • Fans, Blowers • Pumps, Compressors • Grinders, Chippers • Conveyors, Shredders • Crushers, Mixers • Cranes, Extruders • Refiners, Chillers 3
Page 1: Motor Protection Principles Craig W
Page 5 and 6: Thermal Stress Causes Motor Failure
Page 7 and 8: Motor Electrical Protection • The
Page 9 and 10: Thermal Model - Motor States • Mo
Page 11 and 12: Thermal Overload Pickup • Set to
Page 13 and 14: Overload Curve Selection for Therma
Page 15 and 16: Hot/Cold Safe Stall Ratio HCR = LRT
Page 17 and 18: Overload Curve Selection A custom o
Page 19 and 20: Thermal Model - Current Unbalance B
Page 21 and 22: Thermal Model - RTD Bias • Accele
Page 23 and 24: Overvoltage Protection • The over
Page 25 and 26: Unbalance Protection • Indication
Page 27 and 28: Ground Fault Protection Zero Sequen
Page 29 and 30: Differential Protection • Differe
Page 31 and 32: Differential Protection Biased diff
Page 33 and 34: Stator RTD Protection • A simple
Page 35: Conclusions • Induction & synchro

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