Space charge signal in line-plate electrode system under dc field on PEA method

The treeing phenomena are well known as an initiation process of electrical breakdown in the electric power cables. It is discussed that the charge injection from electrode is related to the growth of the tree. The space charge measurement technique by the pulsed electro acoustic (PEA) method is widely used. However, the measurement in the non-uniform electric field has not been realized in PEA method. The space charge distribution signal (PEA signal) in a needle-plate and line-plate electrode system in a silicone rubber specimen have been measured. Although the PEA signal from the needle electrode cannot be detected, the PEA signal from the line electrode can be detected. The PEA signals were measured under various dc field in Silicone rubber. In this paper, some transient state space charge signals in the line-plate electrode system in PEA method have been reported.