Semi-Hermetic Refrigeration Compressor Motor Protection | Phase Loss and Unbalanced Current Protection
Phase loss and three-phase unbalance trigger 36% of semi-hermetic motor burnout accidents, xiteliduo Refrigeration Compressors introduces electrical protection configuration. Semi-hermetic refrigeration compressor phase loss protection must trip within 2 seconds once single phase power loss occurs. Piston refrigeration compressor motor also needs three-phase current monitoring. Allowable current unbalance rate shall not exceed 10%. Cold storage refrigeration compressor three-phase current unbalance above 12% will produce local overheating of winding and accelerate insulation aging. Current transformer and electronic motor protector are recommended instead of simple thermal relay for continuous-operation cold storage compressors. 10 recommended hot search keywords: cold storage refrigeration compressor, piston refrigeration compressor, semi-hermetic refrigeration compressor, refrigeration compressor motor protection, refrigeration phase loss protection, refrigeration three-phase unbalance, refrigeration winding overheating, refrigeration compressor manufacturer, cold storage electrical protection, refrigeration compressor supplier
FAQ
Q1: What percentage of semi-hermetic motor burnout comes from phase loss and current unbalance? A: 36% of motor burnout faults are caused by phase loss or three-phase imbalance. Q2: What is the required reaction speed for phase loss protection? A: Protection trip within 2 seconds after phase loss. Q3: What is the maximum allowable three-phase current unbalance ratio? A: Unbalance rate should not exceed 10%. Q4: What unbalance value will cause rapid winding overheating? A: Current unbalance over 12%. Q5: Which protection device is better for continuous running compressors? A: Current transformer plus electronic motor protector. Q6: What limitation does simple thermal relay have? A: Slow response and cannot quickly detect phase loss fault. Q7: What damage does three-phase unbalance produce? A: Uneven heating of winding, local hot spot and insulation damage.
