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Space charge accumulation and conduction current in low density polyethylene (LDPE) incuding cumylalcohol under dc high electric field were investigated using improve PEA (pulsed electro-acoustic) measurement system. In the bulk of XLPE that is being used for power transmission cables, there remain some chemical residues of crosslinking by-products such as α-methylstyrene, acetophenone and cumylalcohol...
A large quantity of hetero charge was observed in polyimide (Kapton®-H) film subjected to high electrical stress of 100kV/mm and under the condition of high humidity. In order to investigate the hetero charge accumulation, Quantum Chemical Calculation was applied to a small piece of polyimide specimen for obtaining an energy band structure, a band gap and an electric carrier trap level. Furthermore,...
Relationship between breakdown strength and space charge formation in polyimide film under dc high stress at various temperatures is investigated using pulsed electro-acoustic (PEA) method. Polyimide films are used for various electric and electronic devices as insulating materials. They are demanded to show a good performance at various condition like at high temperature, under high electric stress...
The relationship between space charge accumulation and breakdown at various temperatures is investigated by observing the space charge formation in low density polyethylene (LDPE) and LDPE/MgO nanocomposite material under dc high stress. We have reported, earlier, that, enhancement of electric field in LDPE by packet-like charge under dc stress might be a cause of its electrical breakdown. Furthermore,...
In this report, we tried to simulate the behavior of space charge injection in low-density polyethylene (LDPE) under relatively low electric stress. In our previous paper, we found an interesting packet-like charge behavior in LDPE under high DC electric field of more than 100 kV/mm. It is thought that the huge packet-like charge must strongly affect to breakdown characteristics of LDPE. To analyze...
In our previous paper, we found an interesting packet-like charge behavior in low-density polyethylene (LDPE) under high DC electric field of more than 100 kV/mm. By existence of the injected huge amount of packet-like charge, electric field near cathode electrode was sometimes enhanced up to more than twice of the applied electric field. Therefore, it is thought that the huge packet-like charge must...
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