ABB GSA-OO Manuel technique - Page 12
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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
—
Conductor loading
The GSA-OO bushings is heat run tested with solid
conductors and 1200 mm
2
together with calculated values for different stranded
cables are given in the table below:
Table 6.
Bushing
Conductor
LF 135 073
Solid rod ø 58 mm
Stranded cable
1200 mm
2
900 mm
2
450 mm
2
150 mm
2
LF 135 123
Solid rod ø 58 mm
Stranded cable
1200 mm
2
900 mm
2
450 mm
2
150 mm
2
LF 135 145
Solid rod ø 58 mm
Stranded cable
1200 mm
2
900 mm
2
450 mm
2
150 mm
2
LF 135 170
Solid rod ø 58 mm
Stranded cable
1200 mm
2
900 mm
2
450 mm
2
150 mm
2
LF 135 245
Solid rod ø 58 mm
Stranded cable
1200 mm
2
900 mm
2
450 mm
2
150 mm
2
stranded cable. The test currents
Tested permissible
Calculated
current
permissible
IEC
IEEE
current
A
A
A
2500
2500
2000
2000
1500
1000
500
2000
2000
1600
1600
1200
850
450
2000
2000
1600
1600
1200
850
450
2000
2000
1600
1600
1200
850
450
1600
1600
1250
1250
950
650
350
Overloading of bushings
If the conductor for the bushing is selected for 120 % of the
rated current of the transformer, the bushing is considered
to be able to withstand the overload conditions stated in
IEC 60076-7 without further clarifications or tests,
according to IEC 60137.
Short-time current
The rated thermal short-time current (I
according to IEC 60137.
Table 7.
Rated
current
Area
Conductor
A
mm
2
Solid rod
Ø 58 mm
2500.. 1600
2642
Stranded
draw-lead
2000.. 1250
1200
) is calculated
th
Short-time current (I
)
Dynamic
th
kA, rms
current (I
1 s
2 s
kA, peak
100
100
315
89
63
157
)
d