ABB GSA-OO, Техническое руководство

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TR A N S FOR M E R BUS H I NG S T YPE G SA - OO T EC H N I C A L G U I D E 13
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Recommendations for positioning
The maximum stresses in the oil at the surface of the shield
insulation and the parts surrounding the bushing must be
limited to those values normal for insulated conductors and
other similar components in the same transformer.
The withstand voltage in a specific case depend upon many
factors beyond control of the bushing manufacturer.
Therefore the configuration and distances given below are
only intended as guidelines.
ABB can provide assistance with field calculations to
confirm the compatibility between the transformer and the
bushing.
Table 8.
Type
GSA-OO
Internal
insulation level
of transformer
kV
Shield
Distance to
earthed parts
(with
shield) R1
mm
(without
shield) R2
mm
73 350-140 LF 170 020-S 130 90
LF 170 020-T
123 550-230 LF 170 020-S 200 145
LF 170 020-T
145 650-275 LF 170 020-S 228 165
LF 170 020-T
170 750-325 LF 170 020-S 260 190
245 1050-460 LF 170 046-AT 400 270
R1
Min. R5
Distance to
uninsulated
detail
60°
Space for current
transformer
Distance to flat surface e.g.
tank or core clamp
R2
Min. R2
45°
—
09 Recommendations for positioning.