Multilevel phase unbalance compressor motor protection system

Details Multilevel phase unbalance compressor motor protection system Multilevel phase unbalance compressor motor protection system

G - Physics

01

R

324/18, 341/28,

G01R 31/34 (2006.01) F25D 29/00 (2006.01) G01R 29/16 (2006.01) G01R 31/02 (2006.01) H02H 7/09 (2006.01)

Patent

CA 2036699

Title MULTILEVEL PHASE UNBALANCE COMPRESSOR MOTOR PROTECTION SYSTEM Inventor ROBERT M. SWANSON PAUL C. RENTMEESTER DAVID M. FOYE Abstract A method of protecting the compressor motor of a refrigeration system using a multiphase AC power source. The method comprises the steps of monitoring each phase of the power supply to the compressor motor; calculating an average phase for the phases of the AC power supply; determining a maximum phase unbalance deviation from the average phase; determining if a first level of phase unbalance protection is active; setting a system protection level as the first level of phase unbalance protection if the first level is active; setting the system protection level as a second higher level of phase unbalance protection if the first level is not active; and initiating a compressor motor shutdown if the system protection level is exceeded by the maximum unbalanced phase deviation.

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