Patent GB-463987-A (GB)
Title: Improvements in or relating to outdoor electrical switchgear
IPC: H02B1/00
Filed: 1935-10-28
Abstract: 463,987. Switchgear structures. DAVIES, D. R., and METROPOLITANVICKERS ELECTRICAL CO., Ltd. Oct. 28, 1935, No. 29751. [Class 38 (v)] Relates to outdoor switchgear of the type in which a plurality of sets of busbars are connectible to feeders through breakers and isolating switches, each feeder being connected through a plurality of single-break units comprising respective breakers and isolating switches in the several phases, and further of the type known as metal-clad in which the apparatus and conductors are enclosed in earthed metal chambers &c. which may be filled with oil, solid insulating compound, or other media. Consists in that the single-phase units associated with similar phases of the sets of busbars are arranged in parallel rows, whilst the units associated with each feeder are arranged in a column across the busbars with each unit arranged substantially vertically above the associated busbars and separated therefrom by a substantially horizontal fireproof floor or partition. The chambers &c. enclosing the individual busbars are separated from one another by vertical fireproof walls or partitions so as to be each located in a separate fireproof tunnel, and the feeder cables extend across the busbars above the horizontal wall, and are led through a fireproof wall extending parallel to the busbars and forming a boundary of one or more fireproof tunnels, which accommodate the feeder cables and extend parallel to and adjacent to an outer busbar tunnel. Fig. 1 shows the three single-phase breakers 10 .. 12, which are of the character disclosed in Specification 395,088, for connecting one feeder 28 to the main busbars 1 .. 3 or auxiliary busbars 4 .. 6, and Fig. 2 shows the breaker 11 for busbar 5 in relation to the breakers 13, 14 for two other feeders. Each busbar is located in a fireproof tunnel composed of walls 8 and a horizontal partition 9, the breakers being supported on oil or compoundfilled teeing chambers 15 disposed on partition 9 so as to bestride the wall 8 of the associated busbars, as 2, 5 for the breaker 11. The fixed contact 16 of each breaker is supported on a condenser bushing 17 and connected to conductors 19 of condenser bushings 20, 21 extending into teeing chambers 22 mounted on wall 8. The chambers 22 enclose an isolating blade 24 engageable with a busbar contact 23 and, if desired, with an earthing contact 25. The busbars and conductors 19 may be enclosed in condenser-type insulation as disclosed in Specifications 345,303; and 354,350 [Group XXXVI]. The moving contacts 26 of the breakers are connected to the feeders over isolating switches 27 in chambers 34, which are supported from the breaker tanks and from fireproof cross-partitions 35 separating the columns and provided with cable racks 36. The feeders are led through an extension 29 of wall 8 into racks 33 in a feeder-tunnel 30 formed by the wall 8, an outer fireproof wall 31, and a horizontal fireproof wall 32. The switchgear-control cables 37 are located in a channel which is located over tunnel 30 and closed by foot-plating 38. Specification 416,704 also is referred to.