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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
Solid rod conductor
The solid rod is produced from electrolytical copper and
divided into two parts for ease of assembly. The parts are
joined together with a screw joint with undroppable screws.
The lower part of the solid rod is designed to enable
connection by brazing. The solid rod is available with two
alternative dividing points, 20 mm below the bushing flange
or 20 mm below the space for current transformer and is
delivered without paper insulation.
Insulate
up to
here
—
08 Solid rod conductor.
Table 5. Ordering particulars for solid rod conductor.
Division at flange (at 100 mm flange extension
for LF 135 170, LF 135 245 and LF 135 145)
Bushing Cat. No.
Upper part LF 170 085
LF 135 073
-BA
-A
-BB
-A
-BC
-A
LF 135 123
-CA
-D
-CB
-D
-CC
-D
LF 135 145
-FA
-N
-FB
-N
-FC
-N
LF 135 170
-DA
-G
-DB
-G
-DC
-G
LF 135 245
-EA
-J
-EB
-J
-J
-EC
Positioning of stranded cable
It is important that the stranded cable is positioned in the
centre of the lower part of the condenser core. There is
otherwise a certain risk that the electrical field affecting the
lower end of the high voltage foil will be too high. The centre
position of the stranded cable can be achieved by means of
a thicker layer of insulating paper around the cable. Allowed
deviation for the stranded cable from the centre of the
bushing is ± 5 mm. It is however important to have a loose of
a few mm between the paper and the bushing hole, in order
to let oil enter the centre hole when filling the transformer.
Conductor insulation
Draw leads and solid rods must be insulated with vacuum
D1
oil-impregnated insulating paper or equivalent, to give
D3
sufficient insulation integrity. The paper insulation must be
min. 2 mm thick.
Stranded cable: The paper insulation must be brought
min. 50 mm inside the bushing centre hole.
Solid rod: The paper must fill the recess and cover the whole
35 47
solid rod end downwards.
Lower part LF 170 086
-A
-B
-C
-D
-E
-F
-P
-R
-S
-G
-H
-I
-J
-K
-L
Division at current transformer
Upper part LF 170 085
Lower part LF 170 086
-
-
-B
-A
-C
-A
-
-
-E
-D
-F
-D
-
-
-P
-P
-R
-P
-
-
-H
-G
-I
-G
-
-
-K
-J
-L
-J
11
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