Motor Protection Seminar
-Seminars Home
TECHNICAL TRAINING BY:
BERNIE H. MOISEY
Professor of Electrical Engineering Northern Alberta Institute of Technology
Edmonton, Alberta Canada
*25 Years of Teaching and Consulting*
*Consultant to Oil & Gas, Petrochemical, Pipeline, Utility, &
Mining*
*IEEE Trainer and highly sought out speaker in North America*
MOTOR PROTECTION
The art of motor protection has changed drastically with the introduction
of the microprocessor motor protection relay. Programming the new relay
requires a thorough knowledge of stator and rotor operating characteristics,
both under normal and abnormal conditions. The algorithms used allow the
end user to run motors at upper limits and still provide adequate protection.
This seminar is somewhat generic in scope but specific motor protection
and setpoints are directly related to the Multilin 269+ Motor Protection
Relay.
Specific Topics:
Equivalent circuit, loading
Abnormal voltage - low, high, phasors and motor losses unbalanced,
residual and
Insulation, temperature rise and starting relative life
Single phasing - causes,
Thermal limit curves, hot & cold, sequence currents, motor locked
rotor, failure to heating and the "K" factor accelerate and running overload
Negative sequence current -
Thermal capacity
12T algorithm temperature rise, relative
RTD bias setpoints life and derating
Full load thermal capacity
Unbalance protection algorithm
reduction setpoints
Instantaneous overcurrent
Grounding - systems, connections protection and setpoints
Differential protection
Synchronous motors
Loss-of- field/out-of-step
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