Siemens NXAIR Installation Instructions Manual page 155

For panels with removable voltage transformers
Fig. 222: Connection compartment on panel with
removable voltage transformers:
≤ 12 kV
U
r
110-0084.9 / 15
NOTICE
Damage to the switchgear panels
Danger of flashovers if the connecting cables from the insulating bushings for the
removable voltage transformers are laid too close to the earthing conductors of the
cable shield.
Keep the minimum distances of the connecting cables between the cable
connections to the insulating bushings for the removable voltage
transformers and the earthing conductors of the cable shield:
•
≤ 12 kV:
For U
r
•
For U = 17.5 kV: Minimum distance 160 mm
r
Distance ≥ 100 mm
(3)
Distance ≥ 160 mm
(4)
Connecting cables from the insulating bushings for
(5)
the removable voltage transformers
NXAIR /
Minimum distance 100 mm
Fig. 223: Connection compartment on panel with
removable voltage transformers:
U = 17.5 kV
r
≤
40 kA
Electrical connections
155