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Study on layer short mechanism and discharge pattern in refrigerant compressor for refrigerants with disproportionation reaction like HFO-1123.

Number: No 128

Author(s) : FUKUTA M., FUJIMOTO H., MOTOZAWA M.

Summary

HFO-1123, one of the low GWP refrigerants, will be decomposed with receiving large amounts of energy under high temperature and pressure condition. Short-circuit between motor winding wires caused by an insulation breakdown, i.e. layer short, in refrigerant compressors could be a trigger of the disproportionation reaction of HFO-1123.
In this study, the layer short mechanism and the electric energy discharged by the layer short of winding wire in the refrigerant compressor were investigated. A compressor equipped with a short-circuit generation mechanism in a compressor shell was used to measure the electric energy by the layer short during the compressor operation. Experiments were carried out mainly with the short-circuit between both ends of a mainwinding as the worst case. There were several short-circuit patterns and the maximum current was observed to be 700 – 900 A and the electric energy was about 160 J. When the short-circuit occurred between terminals of the main-winding and an auxiliary-winding, the motor stopped while the electricity was continuously supplied, and temperature of the winding wire increased approximately 2.5°C/s.

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  • Original title: Study on layer short mechanism and discharge pattern in refrigerant compressor for refrigerants with disproportionation reaction like HFO-1123.
  • Record ID : 30029998
  • Languages: English
  • Subject: Technology, HFCs alternatives
  • Source: 13th IEA Heat Pump Conference 2021: Heat Pumps – Mission for the Green World. Conference proceedings [full papers]
  • Publication date: 2021/08/31

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