numerical_spacechg - Numerical Analysis of PEA Signal in...

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Numerical Analysis of PEA Signal in Line-plate Electrode System Masumi Fukuma, Takanobu Itoga and Shinji Fujikawa Department of Electrical Engineering, Matsue National College of Technology, Nishiikuma, Matsue, 690-8518, JAPAN Email: fukuma i)matsue-ctjp Abstract: The treeing phenomena are well known as a initiation process of electrical breakdown in the electric power cables. It is discussed that the injected charge from electrode is related to the growth of the tree [1]. The space charge measurement technique by the pulsed elec- tro acoustic (PEA) method is widely used. However, the space charge measurement in the non-uniform electric field has not been realized. From the viewpoint, it is con- sidered that the measurement technique of space charge distribution under non-uniform electric field is important for the investigation of the electrical breakdown phenom- ena. Although the measurement of the space charge sig- nal (PEA signal) in the needle-plate electrode system has been carried out, the PEA signal could not be detected in the needle-plate electrode system. In order to measure the space charge distribution in non-uniform electric field, a numerical analysis model of acoustic wave generation and propagation in a line-plate electrode system have been developed. In this paper, the experimental results and numerical analysis results in the line-plate electrode system have been reported. INTRODUCTION The space charge measurement technique by PEA method is widely used to investigate dielectric properties and the electrical breakdown phenomena in a insulating materials [2]. The treeing phenomena are well known as a initiation process of electrical breakdown of the electric power cables. It is considered that the space charge behavior under non-uniform electric field relates to the progress of the tree. However, it has not been clarified on the space charge behavior in the needle-plate electrode system. The measurement techniques of space charge distribution under non-uniform electric field is also important in the practical use. As an electrode system which gives non-uniform electric field, there are the needle-plate and line-plate electrode systems. In line- plate electrode systems, acoustic wave signal (PEA signal) form tip of line electrode can measure in a silicone rubber sample. To determine the space charge distribution in the line-plate electrode system, an analysis of acoustic wave generation and propagation is necessary in the PEA method. EXPERIMENTAL PEA signal in line-plate electrode system We have tried measurement of the PEA signal in a needle- plate electrode system, however PEA signal from the tip of needle electrode could not be detected. Schematic diagram of PEA signal measurement system in the line-plate electrode sys- tem is shown in Fig. 1. The acoustic wave is generated in the specimen and at the interface between electrode and speci- men due to applied pulse voltage in PEA method. The acoustic wave is generated in the specimen and propagated in the lower electrode, and reaches the
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