交流課電下の架橋ポリエチレン中の空間電荷形成

抄録

Space charge formation in cross-linked polyethylene (XLPE) under AC voltage application were observed using Pulsed electro-acoustic (PEA) method. To observe the change of the space charge distribution with the changing voltage of AC, a new automatic measurement system with PEA method has been developed. Using the new system, it makes possible to observe the space charge formation at any phase angle of applying AC voltage. In this report, the frequency dependence from about 0.0002 to 50Hz (period T=20ms-80min) on the space charge formation were investigated. Under AC voltage stress with long period (T=40 and 80min), the accumulation of hetero space charges was observed. However, almost no space charge was observed under AC voltage with the period of less than 1min. From above results, it was found that a few minutes were required to form the space charge, which origin was residual byproducts generated by the crosslinking reaction.