Installation and maintenance guide
1ZSC000563-AAX EN, REV. A, 2019-03-21
7
2 Product description
2.1 Design
Overview
The GSC type is a transformer bushing. It is made for immersed oil to air service. The bushing is of the dry,
gas-free type, with a resin impregnated paper RIP condenser core as the primary insulation, and silicone
rubber (SiR) sheds as outdoor insulation. Bushings of this design can be installed at any angle from vertical
to horizontal.
The bushing is built around an aluminum or copper center tube on which the condenser core is wound. The
core is wound from crepe paper with aluminum foil inserts for electrical stress control. The core is
impregnated and cured in vacuum, giving a partially discharge-free bushing with low dissipation factor (tan δ).
The insulator is made of composite material and has a silicone shed. The space between the condenser core
and the insulator is filled with insulating gel.
On the flange there is a test tap. The outer conducting layer of the condenser core is connected to the
insulated test tap. A voltage tap, U
R
= 6 kV, is available as an option.
The GSC bushing is made for operation on the valve side of an HVDC converter transformer. As an option, it
can also have an extended ground plane on the air side, for operation through a wall, for example in a HVDC
converter station.
For a detailed description, please refer to the Technical guide, 1ZSC000563-AAW.
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