Technical GuideSeries 01 · OIP & RIP Bushings
OIP or RIP Transformer Bushing: What Should Buyers Check?
Compare oil and dry-core construction, mounting, maintenance and model-specific IEC 60137 test evidence before choosing a transformer bushing.
GCB72.5kV ～ 800kV
Review model drawings and test evidence
Gas-Insulated Composite Bushings
Gas-Insulated Composite Bushing
Gas-insulated composite bushings for 72.5kV to 800kV GIS switchgear, featuring explosion-proof ductile composite housings, optimized field shielding, and maintenance-free reliability.
Rated Voltage72.5kV ～ 800kV
Rated Current2000A ～ 5000A
Insulation TypeSF6 / Gas Insulated + High-Strength Hollow Composite Insulator (HTV Silicone Sheds)
Catalog standardIEC 60137, IEC 62271-203, GB/T 4109, GB/T 7674
PD requirementConfirm by model
Test evidenceRequest with RFQ
Buyer requirement checklist
Confirm GIS voltage class, air-side hollow composite insulator parameters, conductor interface, and gas sealing criteria.
- Rated voltage (72.5kV to 800kV), rated current and gas medium (SF6 or eco-gas)
- Hollow composite insulator dimensions, creepage distance and pollution class
- Shielding electrode design, conductor interface and terminal drawing
- Gas tightness, mechanical cantilever withstand and seismic requirements
Governed by IEC 60137, IEC 62271-203, GB/T 4109 and GB/T 7674 for gas-insulated apparatus bushings.
Product Technical Overview
Gas-Insulated Composite Bushings (GIS Bushings) are designed for high-voltage and ultra-high-voltage electrical equipment, particularly gas-insulated switchgear (GIS) and gas-insulated substations. They typically consist of a high-performance hollow composite insulator, central conductor, shielding electrodes, and sealing components, providing reliable electrical insulation and mechanical support.
Compared with conventional porcelain bushings, composite bushings offer advantages such as lightweight construction, improved impact resistance, and easier installation. Their optimized insulation and sealing structures help ensure reliable electrical performance and long-term operational stability.
Key features include a lightweight composite structure with high mechanical strength, reliable electrical insulation performance, optimized electric field distribution, dependable gas sealing design, and reduced maintenance requirements. They are widely applied in gas-insulated switchgear (GIS), gas-insulated substations, and high-voltage power transmission and distribution systems.
EONOVA provides sourcing support for gas-insulated composite bushings based on customers' technical specifications and project requirements.
// CUSTOM SOURCING & ENGINEERING SPECInquire Now
EONOVA provides bespoke engineering and sourcing support for 72.5kV to 800kV gas-insulated composite bushings matched to OEM switchgear interfaces (Sieyuan, Pinggao, Toshiba, XD, TBEA, Taikai, Mitsubishi), custom creepage, extreme temperature, and high-seismic site specifications.
Compatible Substation Apparatus
Gas-insulated switchgear (GIS) installations from 72.5kV to 800kVGas-insulated substations (GIS / GIE substations)High-voltage and ultra-high-voltage power transmission gridsCoastal, offshore wind substation and heavily contaminated industrial power plantsHigh-altitude, severe earthquake-prone and extreme climate grid interconnects
Gas-Insulated Composite Bushing (GCB) Technical Specifications Table
Showing 11 of 11 models
Catalog values are representative. Confirm the selected model, drawings and test evidence during inquiry.Governed by IEC 60137, IEC 62271-203, GB/T 4109 and GB/T 7674 for gas-insulated apparatus bushings.
| Parameter | Specification |
|---|---|
| Rated Voltage Class | 72.5 kV ～ 800 kV (72.5, 126, 145, 252, 363, 550, 800 kV) |
| Rated Current | 2000 A ～ 5000 A |
| Insulating Medium | SF6 (Sulphur Hexafluoride) / Eco-friendly insulating fluorogas mixtures |
| Insulator Housing | FRP Hollow Tube + Injection-Molded HTV Silicone Rubber Sheds |
| Partial Discharge (PD) | ≤ 5 pC at 1.05 Um / √3 |
| Creepage Distance | Class e (≥ 31 mm/kV) / Very Heavy Pollution, or custom class d (≥ 25 mm/kV) |
| Annual Gas Leakage Rate | ≤ 0.1% per year (Helium mass spectrometry leak tested) |
| Cantilever Withstand Load | 3.0 kN ～ 12.0 kN (depending on voltage rating and tube length) |
| Seismic Withstand Level | AG5 (0.5g ground acceleration / 9-degree seismic withstand) |
| Operating Temperature | -50 °C ～ +55 °C (Extreme cold & tropical desert compatible) |
| Applicable Standards | IEC 60137, IEC 62271-203, GB/T 4109, GB/T 7674 |
Custom Engineering & Flange Dimensions Note:
Dimensions, interfaces and replacement compatibility require approved drawings and technical review.
Gas-Insulated Composite Bushing Core Engineering Advantages
Lightweight composite structure
Lightweight composite structure: weight reduced by over 50% compared with conventional porcelain, significantly reducing mechanical stress on GIS tanks and substation structures.
Excellent vandalism & explosion resistance
Excellent vandalism & explosion resistance: ductile composite housing prevents brittle fracture and fragment scattering under extreme internal arcing or shock, safeguarding personnel and equipment.
Superior pollution flashover resistance
Superior pollution flashover resistance: HTV silicone rubber sheds offer excellent hydrophobicity and hydrophobicity transfer, eliminating manual washing in coastal salt-fog and heavy contamination.
Reliable gas sealing design
Reliable gas sealing design: high-integrity dual sealing surfaces and precision-machined interface flanges ensure ultra-low annual leakage rates far superior to standard limits.
Optimized electric field distribution
Optimized electric field distribution: computer-modeled shielding electrodes and grading rings deliver smooth voltage gradients and exceptionally low partial discharge across all operating duties.
Excellent seismic resilience & maintenance-free lifecycle
Excellent seismic resilience & maintenance-free lifecycle: flexible construction withstands high seismic accelerations with zero scheduled maintenance throughout its service life.
Compatible Substation Apparatus
Gas-insulated switchgear (GIS) installations from 72.5kV to 800kVGas-insulated substations (GIS / GIE substations)High-voltage and ultra-high-voltage power transmission gridsCoastal, offshore wind substation and heavily contaminated industrial power plantsHigh-altitude, severe earthquake-prone and extreme climate grid interconnects
Gas-Insulated Composite Bushing Materials & Manufacturing Process
Hollow Composite Housing (FRP Tube + HTV Silicone)
High-strength continuous filament-wound epoxy fiberglass tube lined with high-temperature vulcanized (HTV) silicone rubber sheds with exceptional hydrophobic retention and flame-retardant rating.
Central Conductor & Wiring Terminal
High-conductivity electrolytic copper or aluminum alloy tubular conductor with silver-plated or tin-plated contact surfaces, engineered for continuous currents up to 5000A with minimal thermal rise.
Shielding Electrode System
Precision-formed, polished aluminum shielding electrodes optimizing electric field transition between GIS ground enclosure and high-voltage live conductor.
Hermetic Flange & Dual-Sealing Assembly
High-grade aluminum alloy casting/forging flanges with EPDM or fluorosilicone dual O-rings, helium-leak-tested to ensure hermetic SF6 containment.
Engineering Inquiry Draft
Request Quotation for Gas-Insulated Composite Bushing
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Gas-Insulated Composite Bushing: FAQ
- What voltage and current range does the Gas-Insulated Composite Bushing cover?
- Catalogue voltage range: 72.5kV ～ 800kV; current range: 2000A ～ 5000A. Confirm the rating of the specific model and drawing.
- What insulation or construction is used?
- SF6 / Gas Insulated + High-Strength Hollow Composite Insulator (HTV Silicone Sheds).
- Which standards are referenced?
- Catalogue standard reference: IEC 60137, IEC 62271-203, GB/T 4109, GB/T 7674. Request type-test evidence for the specific model.
ENGINEERING WHITEPAPERS & IEC GUIDES
View All 10 WhitepapersRelated Technical Selection & Standard Guides
Technical GuideSeries 01 · OIP & RIP Bushings
Choosing Oil-to-SF6 and Wall Bushings for Equipment Interfaces
Check oil and gas interfaces, sealing, wall penetration, insulation level and the applicable test plan against equipment drawings.
COMPLEMENTARY SERIES
View All 7 Series
