Item
Part
Item
Part
1
Hexagon screw
10
Transformer vent (not shown → on the
back of the flange armature)
2
Air release screw
11
Insulating body
3
Composite insulator
12
Central tube (draw lead or detachable
conductor bolt)
4
Flange armatures
13
Aluminum foil
5
Measuring connection/voltage splitter
connection
14
Polyurethane-elastomer
6
Sling points
15
Head armature
7
Grounding screw
16
Clamping piece
8
Lift-off screws
17
Seals
9
Screened mouth end
The main insulation of the RIS-transformer bushing is an insulating body (11).
Insulating body
The insulating body consists of a plastic fleece and grading layers:
● The plastic fleece is impregnated with epoxy resin under a vacuum.
● The grading layers are coaxially placed aluminum foils (13) which effect even voltage
distribution on the insulating body.
Bushings with undetachable conductor bolts do not have a central tube (12).
Composite insulator
The insulating body is incorporated in a composite insulator (3).
The composite insulator consists of:
● Filament winding tube
● Silicone sheds (connected to the epoxy resin tube by vulcanization)
The head armature (15) and the flange armature (4) are connected by the epoxy resin tube.
Elastomer-connection
The gap between the insulating body and the composite insulator is filled with a foamed
polyurethane elastomer (14). The elastomer rigidly connects the components together. The
components can no longer be separated without destroying them.
Bushing flange
The bushing flange is fitted with:
Range STARIS®-Sia+
15/53