Table of Contents
Advertisement
T R A N S F O R M E R B U S H I N G S T Y P E G S A - O O T E C H N I C A L G U I D E
—
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.
Internal
insulation level
Type
of transformer
GSA-OO
kV
Shield
73
350-140
LF 170 020-S
LF 170 020-T
123
550-230
LF 170 020-S
LF 170 020-T
145
650-275
LF 170 020-S
LF 170 020-T
170
750-325
LF 170 020-S
245
1050-460
LF 170 046-AT
Distance to
earthed parts
(with
(without
shield) R1
shield) R2
mm
mm
130
90
200
145
228
165
—
09 Recommendations for positioning.
260
190
400
270
Space for current
transformer
45°
Min. R2
13
R1
60°
Min. R5
Distance to
uninsulated
detail
Distance to flat surface e.g.
R2
tank or core clamp
Advertisement
Table of Contents
