Multilevel phase unbalance compressor motor protection system

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

1990-03-30

1991-10-15

Teska, Kevin J.

Boots, shoes, and leggings

364481, 361 22, 361 23, G01R 2500, G06F 1520

Patent

active

050580310

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 the 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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