Title :
The effects of polypropylene on the impulse breakdown mechanism of the laminated oil-impregnated PPLP
Author :
Saitoh, Kazuo ; Kawakami, Yohji ; Murata, Masao
Author_Institution :
Nagaoka Univ. of Technol., Niigata, Japan
Abstract :
The impulse breakdown mechanism of PPLP (polypropylene laminated paper) is investigated in detail, taking into consideration the effect of PP (polypropylene) film. It is found that, although both positive and negative streamers affect the impulse breakdown mechanism, each effect is very different. That is, the positive charges are trapped on the surface of PP film easily, while the negative charges tend to spread into the insulating material. Consequently, it is suggested that the most essential factor of the impulse breakdown mechanism is the positive charges. Comparison of a sheet of PPLP and a specimen made of Kraft papers and PP film suggests the importance of the effect of oil thin films between Kraft paper and PP film
Keywords :
composite insulating materials; electric breakdown of solids; electric strength; impulse testing; insulating oils; insulation testing; laminates; paper; partial discharges; polymer films; Kraft papers; breakdown strength; effect of oil thin films; effects of polypropylene; impulse breakdown mechanism; laminated oil-impregnated PPLP; negative charges; negative streamers; polypropylene laminated paper; positive charges; positive streamers; Cable insulation; Cables; Dielectric breakdown; Dielectric materials; Dielectrics and electrical insulation; Electric breakdown; Electrodes; Oil insulation; Paper technology; Transmission lines;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1992. Annual Report. Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-0565-5
DOI :
10.1109/CEIDP.1992.283181
