Gas Insulated Switchgear

Gas Insulated Switchgear (GIS) is a complete set of high-voltage power distribution equipment. It integrates high-voltage components — circuit breakers, disconnectors, voltage instrument transformers, and busbars — into a fully sealed metal enclosure.

This series features a three-phase common-tank design, with the main busbar mounted in either the lower or upper position. It offers a compact layout and high flexibility, with a minimum bay spacing of 800 mm to suit various site conditions. The product offers a high breaking capacity of up to 50 kA and a rated current of up to 4000 A. Its aluminum alloy enclosure delivers excellent corrosion resistance and low weight.

Core Advantages

1.Highly Integrated Structure

GIS integrates core components such as circuit breakers and busbars into a sealed assembly, occupying only one-fifth to one-tenth of the space of conventional switchgear. It significantly saves land resources, making it ideal for space-constrained sites.

2.Superior Insulation and Operational Reliability

GIS uses SF₆ as the insulating and arc-extinguishing medium, providing insulation performance far superior to that of air. Combined with a fully enclosed metal shell, it withstands adverse weather, dust, salt spray, and other external influences, ensuring extremely stable operation.

3.Enhanced Safety Performance

All live high-voltage parts are fully sealed, leaving no exposed conductors, completely eliminating the risks of electric shock and external short circuits. Safety is significantly higher than that of open-type switchgear.

4.Low Maintenance and Long-Term Economy

The enclosed structure protects internal components from aging and damage, resulting in low failure rates and longer maintenance intervals than conventional equipment. It greatly reduces operation and maintenance workload and costs, delivering strong economic benefits throughout the service life.

5.Wide Environmental Adaptability

GIS operates reliably under harsh conditions, including high altitude, heavy pollution, coastal corrosive conditions, extreme cold, and extreme heat. It is suitable for nearly all power grid construction applications.

Main Applications

1.Core Equipment for High-Voltage and Ultra-High-Voltage (UHV) Power Grids

Widely used in substations of 110 kV and above, it replaces conventional open switchgear to enhance grid stability at key grid hubs.

2.Preferred Solution for Land-Scarce Sites

Ideal for central urban areas, underground substations, and indoor power stations. Its compact design effectively addresses space limitations.

3.Power Supply for Critical Loads

It provides stable power for rail transit, large industrial and mining enterprises, data centers, and other Class I critical loads, supporting uninterrupted power supply.

4.Retrofitting and Capacity Expansion of Old Substations

It enables quick capacity upgrades within the existing footprint without major civil works, reducing the retrofitting complexity and costs.

5.Resilient Grid Construction in Harsh Environments

Deployed in coastal, high-altitude, and heavily polluted areas to withstand severe operating conditions, extending the service life of grid assets and strengthening disaster resilience.