GB792460A - Improvements in electrically insulating bushings - Google Patents

Abstract

792,460. Bushing insulators. GENERAL ELECTRIC CO. July 19, 1956, No. 22409/56. Class 36. A high voltage insulating bushing comprises a central conductor 12 extending through a ceramic insulator 25, a tubular electrode 13 coaxial with but separated from the conductor to provide an annular chamber 17, an insulating core 14 around the electrode 13 and an insulating tube 15 about the core and extending below the insulator 25 to define a lower chamber 22 for dielectric liquid which circulates between the chamber 22 and an upper chamber 28 formed between the insulators 15 and 25 by way of the chamber 17. The electrode 13 may be electrically connected to the conductor 12 by screw 18 at the top and by screwed cap 19 at the base and may have holes 20 for the passage of the liquid dielectric. The core 14 may be of impregnated paper and may incorporate electrostatic shielding members and an external shield 21. The tube 15 may be of resin-impregnated laminated material and carries an earth sleeve 16. A metallic mounting flange 26 supports the insulator 25 and is forced against the top edge of sleeve 16 by the tightening of the top terminal assembly (not shown), electrical connection being assured by screw 32. Conductor 31 connects the shield 21 to the flange 26.