Establishment of Space Charge Measurement Technique in Samples with Variation of Temperature

Abstract

The aim of this research work is to establish an accurate measurement technique using pulsed electro-acoustic method for observing a dynamic space charge behavior in insulating materials during elevating temperature under high electric stress. When the high electric stress is applied to the dielectric materials, so-called space charge accumulates in the bulk of dielectrics. It is said that space charge accumulation strongly affects the characteristics of electrical conduction and breakdown strength in dielectrics. Therefore it is necessary to observe the space charge formation in dielectric materials. It is well known that the space charge accumulation in the insulating materials strongly depends on temperature of materials. However, most of the space charge measurement has been carried out at room temperature except for a few reports. It seems that these have been still remained some difficulties for measuring the charge distribution during elevating temperature. Therefore, in this research work, we would like to establish the measurement technique for dynamic behavior of space charge accumulation in insulating materials at high temperature under high electric stress.