The Protection of Electrical Motors

Abstract In the paper we will review the basics for the protection of electrical motors and the benefits that the latest relay technologies bring to the relay engineer. The paper will discuss:
Motor Thermal protection,
Short Circuit protection,
Ground Current protection,
Voltage and frequency protection,
Mechanical jam protection,
Phase Reversal/ Unbalance protection,
Motor Monitoring features in new relays,
Communications protocols: bringing the information to the desk of the engineer.
Keywords: Equipment Monitoring, Protective Relays, Electrical Motors
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