SF6 plastic film insulated outdoor bushing for metalclad switchgear operating at system voltages of 420 kV and above
Abstract
In replacement of conventional oil-paper bushings, a type of SF6 insulated bushing with polypropylene plastic film dielectricum was developed for outdoor operation of metalclad switchgear. Such bushings have the advantage of the conformity of the insulation with that of the matching switchgear and of the nonflammability of the SF6 gas. The choice of the plastic film, the winding technique, the thermal and dielectrical test program, and the high voltage long-term test program are described. Series production of a 420 kV bushing is under way and research specimens for 525 kV were successfully tested.
- Publication:
-
Final Report Messwandler-Bau G.m.b.H
- Pub Date:
- October 1981
- Bibcode:
- 1981mbgm.rept.....D
- Keywords:
-
- Bushings;
- Circuit Breakers;
- High Voltages;
- Electrical Insulation;
- Polymeric Films;
- Polypropylene;
- Sulfur Fluorides;
- Electronics and Electrical Engineering