ABB UniGear ZS1 Instruction Manual page 47

Figure 70: 12/17,5 kV panels – Tee-off 630-1250A, busbars 1250A
40 nr. 4 10x35 screws
42 nr. 8 M10 washers
43 nr. 4 M10 nuts
Figure 71: 12/17,5 kV panels – Tee-off 630-1250A, busbars 1600A-2000A-2500A
41 nr. 4 10x60 screws
42 nr. 8 M10 washers
43 nr. 4 M10 nuts
44 nr. 1 spacer (15mm)
5.6.3.1 Busbars for 12/17.5kV units
Busbars are made of copper and have a flat cross-section for rated current up to 2500A. For 3150, 3600
and 4000A, the busbars have a double D-shaped cross-section. Branch conductors always have a flat
cross-section.
12/17.5kV bushings are made of epoxy resin castings and are arranged as a single casting for all three
phases (figure 61). For bus-tie units the bushings are single and are arranged in the lower part of the
unit. Bushings are held in bushing plates.
For 12 kV, the busbars are bare (without insulation) and without insulating covers up to 2500A.
3150, 3600 and 4000A D-shaped busbars are insulated by means of shrink sheaths and are fitted with
insulating covers.
For 17.5 kV, the busbars are insulated and fitted with covers over the whole current range.
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