長時間加熱したPVCの高温領域での空間電荷形成と絶縁破壊

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The Polyvinyl chloride (PVC) is widely used as an insulating material in various electric products. It is reported that the exothermic reaction exceeding 150°C is caused due to the over-load current and/or inferior electrical wire connection before the ignition of electric products. The exothermic phenomenon may cause deterioration of insulating properties in PVC due to the chemical decomposition. It is necessary to clarify the degradation of insulating properties in PVC under thermal stress exceeding 150°C for the safe use of electric products. In this paper, the space charge distribution and conduction current have been measured in the range from room temperature to 200°C under DC electric field in the heat treated PVC sheet by using the high temperature PEA system. Positive charge injection and increasing conduction current are observed before breakdown over 100°C in the 100°C-300h heat treated samples and non heat treated samples. The obtained results indicate the thermal breakdown process from the analysis of conduction current and electric field. In more high temperature exposed (150°C-100h) sample, the breakdown strength strongly deteriorates in the range from room temperature to 90°C. And the increase of conduction current is observed in the all temperature range before breakdown in the 150°C-100h heat treated PVC. It shows that the heat treatment over 150°C deteriorates the breakdown properties in the range from room temperature to 90°C due to thermal decomposition on dehydrochlorination in PVC. The electric field is emphasized near the cathode due to the positive charge accumulation, and the breakdown strength begins deterioration only above 90°C. It shows that the thermal stress exceeding 150°C causes deterioration of insulating properties and breakdown process is affected by space charge formation in PVC.

長時間加熱したPVCの高温領域での空間電荷形成と絶縁破壊

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