Gas-insulated substations are high-voltage distribution facilities in which the main switching components (circuit breakers, disconnectors, current/voltage transformers, busbars) are housed in sealed metal modules filled with insulating gas (SF₆ or alternative mixtures).

GIS substations offer maximum compactness, high reliability, minimal losses, and resistance to climatic and environmental factors, making them ideal for urban, industrial, and space-constrained facilities.

Purpose of GIS Substations

Distribution and switching of electrical power in medium- and high-voltage networks.

Protection of lines, transformers, busbars, and substation sections.

Use in areas with limited space (city centers, industrial zones).

Operation in conditions of high humidity, pollution, and extreme temperatures.

Improved reliability and reduced risk of power system failures.

Integration into modern digital and automated power systems.

Minimum and maximum technical specifications (general ranges)

Voltage class: 36 kV, 72.5 kV, 110–145 kV, 170 kV, 245 kV, 363–420 kV, up to 800 kV (confirmed by GIS images and diagrams in search results)

Breakmaking current: 20–40 kA (typical values for GIS circuit breakers)

Rated current: 1,250–3,150 A, up to 5,000 A for EHV class

Design types:

fully gas-insulated modules;

modular sections (circuit breaker, isolator, earthing switch, CT/VT);

indoor and outdoor GIS;

single-line and multi-section configurations.

Gas system: SF₆ or alternative gas mixtures at a pressure of 0.4–0.8 MPa (typical for GIS equipment)

Installation: in buildings, containers, underground power complexes, and industrial sites.

Resistance: to UV radiation, contamination, vibrations, condensation, and corrosion.

What We Can Supply and Provide

We supply GIS equipment of any brand—we select the optimal solution based on the facility’s technical requirements.

We design high-voltage switching stations and substations, integrating GIS into the overall power supply system.

We perform configuration, installation, commissioning, and maintenance.

We provide a warranty covering all stages—from equipment selection to commissioning.

Warranties and Liability

We ensure that the equipment complies with international standards, monitor the quality of deliveries, and guarantee the stable operation of GIS within high-voltage systems. Each stage is backed by an official warranty and technical support.