Product Overview
High-Voltage (SF6) GIS
High Voltage GIS Switchgear for Reliable Power Transmission and Substation Applications
High Voltage SF6 Gas Insulated Switchgear (GIS) is an advanced high-voltage electrical equipment designed for power transmission, distribution networks, and substations. It uses SF6 gas as the insulation medium to achieve excellent electrical insulation performance, compact structure, and high operational reliability.
Compared with conventional air-insulated switchgear (AIS), SF6 GIS integrates circuit breakers, disconnectors, grounding switches, busbars, current transformers, and voltage transformers into a sealed metal enclosure, significantly reducing installation space and improving system safety.
High Voltage GIS is widely used in urban substations, power plants, renewable energy projects, industrial power systems, and high-voltage transmission networks.
High-Voltage (SF6) GIS Overview
1. Compact Structure and Space Saving Design
The fully enclosed metal structure greatly reduces the footprint of substations, making GIS especially suitable for areas with limited installation space.
2. Excellent Insulation Performance
SF6 gas provides outstanding dielectric strength and reliable insulation performance under high-voltage operating conditions.
3. High Operational Reliability
The sealed gas compartments protect internal components from dust, humidity, pollution, and external environmental influences.
4. Low Maintenance Requirement
The closed design reduces maintenance frequency and extends equipment service life.
5. Flexible Configuration
GIS can be configured with different modules according to project requirements, including:
- Circuit Breaker
- Disconnect Switch
- Earthing Switch
- Busbar System
- Current Transformer (CT)
- Voltage Transformer (VT)
Key Features
High Safety Performance
Metal enclosure provides excellent protection and operational safety.
Small Installation Area
Requires much less space compared with traditional AIS substations.
Stable Long-Term Operation
Suitable for critical power transmission systems.
Strong Environmental Adaptability
Can operate reliably in harsh weather and polluted environments.
Easy System Expansion
Modular design supports future upgrades.
High-Voltage (SF6) GIS Technical Specifications
The following specifications should be completed according to the selected model and approved product datasheet. Available ratings may vary by voltage class and design.
| Parameter | Specification |
|---|---|
| Product Name | High Voltage SF6 Gas Insulated Switchgear |
| Rated Voltage | 72.5kV / 126kV / 145kV / 252kV / 420kV / 550kV |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current | 1250A – 5000A |
| Short Circuit Breaking Current | 31.5kA – 63kA |
| Insulation Medium | SF6 Gas |
| Installation Type | Indoor / Outdoor |
| Protection Degree | IP65 or customized |
| Standard | IEC 62271-203 |
GIS voltage ranges and technical configurations vary according to manufacturer design and application requirements. High-voltage GIS products are commonly supplied for transmission-level applications up to several hundred kV.
Product Structure & Accessories
Product Structure
A High Voltage Insulator generally consists of:
- Insulating body
- Metal fittings
- End connection hardware
- Mounting components
- Protective sheds (for composite insulators)
- Grounding and fixing accessories
Insulator Types
Depending on application requirements, common configurations include:
Suspension Insulator
Used for supporting overhead transmission conductors and high-voltage lines.
Post Insulator
Used for supporting and insulating busbars, disconnectors, and substation equipment.
Composite Insulator
Uses silicone rubber insulation materials with lightweight design and excellent pollution resistance.
Main Components
SF6 Circuit Breaker
Provides reliable interruption of load current and short-circuit current.
Disconnect Switch
Used for electrical isolation during maintenance and operation.
Earthing Switch
Ensures safe grounding of equipment during maintenance.
Gas Compartment
The sealed SF6 gas chamber provides insulation and protection.
Busbar System
Provides reliable connection between GIS modules.
Technical Standards
The High Voltage SF6 GIS complies with international standards including:
- IEC 62271-203
- IEC 62271-100
- IEC 62271-102
Working Principle of an High-Voltage (SF6) GIS
Working Principle
A High Voltage Insulator works by providing electrical isolation between energized conductors and grounded structures.
The insulating material prevents current leakage while the mechanical structure supports electrical conductors and withstands mechanical forces caused by wind, vibration, and operational conditions.
Why Choose Our High-Voltage (SF6) GIS
Flexible Product Solutions
Different equipment configurations, operating arrangements, and installation options can be provided according to application requirements.
Technical Documentation Support
Product specifications, drawings, and supporting documents can be provided according to the selected model and project requirements.
Application-Based Selection
Our team can review the intended application and technical requirements to help determine a suitable product configuration.
Project-Oriented Support
Our technical team can review project requirements and provide suitable equipment solutions for different power system applications.
F.A.Q.
Supporting Subheading
A High Voltage Insulator is an electrical component used to provide insulation and mechanical support for high-voltage conductors and equipment.
Common materials include porcelain, glass, and composite silicone rubber depending on application requirements.
They are widely used in substations, transmission lines, switchyards, and power distribution systems.
High voltage insulators are commonly designed according to IEC standards such as IEC 61109 and IEC 60383 depending on the product type.
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WHAT WE DO
Applications
Our high-voltage electrical equipment supports a wide range of power infrastructure projects, from substations and transmission networks to power generation and industrial electrical systems. Equipment selection and configuration depend on the specific application, system requirements, and technical ratings.
High-Voltage Substations
Designed for integration into high-voltage substation infrastructure, supporting power system operation and electrical equipment arrangements.
Power Transmission Networks
Suitable for high-voltage transmission infrastructure, supporting network operation and the integration of electrical equipment.
Power Grid Protection System
Designed for power grid substations and transmission networks, supporting reliable voltage conversion and stable electricity distribution.
Industrial Power Supply System
Suitable for industrial substations and power infrastructure where high-voltage electrical equipment is required.
Solar & Wind Energy Station
Designed for solar and wind power projects, supporting efficient energy conversion and reliable integration with the electrical grid.
Hydropower Plant
Suitable for hydroelectric power stations, providing efficient voltage conversion and reliable power transmission from generation to the grid.
Offshore Substation
Designed for solar and wind power projects, supporting efficient energy conversion and reliable integration with the electrical grid.
Railway Electrification
Railway electrification systems provide reliable power for modern rail transportation, ensuring safe, efficient, and stable train operations.