Epoxy Products
GIS Products
Gas insulated switchgear packs medium and high voltage circuits into a fraction of the space air insulation would need. That compactness is the point — and it is also what makes the insulating parts inside the enclosure difficult: the same withstand voltage has to be achieved across shorter distances, so every bushing, support and chamber sits under far higher electrical stress than its equivalent in an air insulated panel.
Indisol casts those parts in epoxy resin, engineered to your switchgear geometry rather than picked from a catalogue, across low, medium, high and very high voltage. The critical components are the medium voltage bushings that carry the circuit through the enclosure wall, and then everything that holds the circuit apart inside it: SF6 busbar supports, fuse tubes and circuit breaker chambers.
Each part is cast as a single monolithic piece, with metal components encapsulated during casting rather than assembled afterwards — no joints and no fasteners inside the insulating path.
Because the electrical stress in an enclosure is the highest we work with, every product we make for SF6 applications is tested at 100%, not by sample: industrial frequency, partial discharges and X-ray examination of the casting.
Looking for a different epoxy insulator? Support insulators, bushings, dividers, sensors and third rail each have their own page — the guide below points you to the right one.
Cast epoxy parts for gas insulated switchgear
Which epoxy insulator do you need?
“Epoxy insulator” is a family name, not a part number. GIS parts are one member of it. If the part you are specifying does something else, go straight to the right family.
Indoors or outdoors: the resin decides
An enclosure is an indoor environment, which is where our aromatic systems belong. Where the part is also exposed to weather, humidity or pollution, the resin changes. Both families cover low, medium, high and very high voltage.
Where neither standard family suits the duty, resin systems can be developed to specific electrical, thermal and mechanical requirements. More on our epoxy resin technology.
How a part for a gas enclosure is made
Most of what can go wrong electrically inside an enclosure is decided before the part ever leaves the mould.
Specified to your enclosure, then tested piece by piece
Cast epoxy has a breakdown strength of 20 to 40 kV/mm depending on the system. Inside a gas enclosure that margin is spent on shorter distances: the withstand voltage of the finished part depends on the creepage path, the clearances and the field distribution around any embedded metal, so we dimension it to your enclosure geometry and system voltage rather than to the material figure alone.
A tolerance here is an electrical requirement, not a question of finish. Dimensional accuracy is held across the series by gelation under pressure at temperature, and metal parts are encapsulated during casting, so nothing inside the insulating path depends on an assembled joint.
For gas insulated applications, where the electrical stress is highest, every single piece is tested rather than a sample: industrial frequency, partial discharges and X-ray examination of the casting. Production runs under ISO 9001 and ISO 14001.
Common questions
Send us the enclosure geometry, the voltage class and the gas.
Every part we cast for gas insulated equipment is engineered to a specification rather than taken off a shelf, so the more you can tell us, the closer the first proposal will be.
Request a quotation → or see how we cast them
