24kv 33kv Sf6 Gis Gas Insulated Switchgear

This medium-voltage GIS solution is well suited for installations where floor space is tight or environmental conditions are harsh. Typical deployment locations include underground power facilities, seashore zones, highland areas and urban substations. Thanks to its fully enclosed construction, the hardware occupies a compact footprint, making it simpler for design specialists to integrate medium-voltage distribution units into both main transformer substations and secondary distribution stations.

Adaptive Modular Architecture

Power distribution projects rarely feature identical circuit layouts, which means compact switchgear platforms must support flexible assembly rather than fixed, one-size-fits-all arrangements. Built around a modular framework, the 24kV 33kV SF₆ GIS Gas Insulated Switchgear USRM6 platform can integrate three distinct functional units: Type C for load break switch modules, Type F for combined functional assemblies, and Type V for circuit breaker modules.

Design teams can pick individual standard modules or pre-assembled combinations according to project electrical schematics. The main busbar infrastructure supports on-site extension, enabling multiple modules to be grouped into varied switchgear layouts. Such modular flexibility allows the equipment to satisfy diverse demands related to outgoing feeders, transformer connections, protective isolation and power distribution duties.

Minimal Maintenance Profile

Conventional outdoor electrical apparatus remains exposed year-round to dust, dampness, contaminants and shifting temperatures. These adverse factors tend to increase recurring inspection and servicing demands throughout the equipment’s operational lifespan.

The 24kV 33kV SF₆ GIS Gas Insulated Switchgear USRM6 adopts a sealed gas-insulated enclosure that physically isolates the primary circuit from ambient conditions. It greatly reduces direct contact between internal components and environmental pollutants and delivers an operation scheme that requires very little routine maintenance. This characteristic delivers distinct advantages for sites that are difficult to access, such as underground power rooms, space-limited urban distribution premises and remote infrastructure assets. Reduced servicing frequency becomes a major evaluation factor when users select equipment for these challenging locations.

Integrated Switching, Protection and Auxiliary Functions

This SF₆ C-GIS platform delivers far more than basic circuit closing and opening actions. Based on the selected module combination, the system can accommodate fault protection, electrical isolation, energy metering, real-time status monitoring, earthing, data communication and automatic control alongside switching functions.

Different functional modules can be matched freely to align the whole switchgear setup with the project’s protection and distribution architecture. This versatility creates broader options for EPC contractors and system integrators tasked with developing complete medium-voltage power distribution networks.

Environmental Operating Parameters

Site ambient conditions should be carefully assessed prior to finalising medium-voltage GIS selection. The 24kV 33kV SF₆ GIS Gas Insulated Switchgear USRM6 series is engineered to operate at elevations up to 4000 m. Its permissible ambient temperature spans from -40°C to +50°C, with a maximum 24-hour average temperature capped at 35°C. For humidity criteria, the 24-hour relative humidity may peak at 95%, while the monthly average value cannot exceed 90%. The installation location must be free of explosive or corrosive vapours, intense mechanical impacts and persistent heavy vibration. Pollution grade must not surpass Class III as specified under GB/T 5582, and the unit has passed seismic qualification for Grade 9 resistance. For projects sited above 1000 m, purchasers need to notify the manufacturer to adjust the SF₆ charging pressure appropriately. Any unusual site environmental requirements need joint confirmation among manufacturers, suppliers and end customers before order placement. As an example, installations at altitudes exceeding 2000 m may require modified gas pressure settings to mitigate internal overvoltage risks inside the tank.

Core Application Sectors

Underground Substations Underground power facilities are usually constrained by limited usable area and strict ventilation limits. The compact sealed GIS design helps designers maximise the use of restricted space while weakening adverse environmental influences, which makes the product ideal for incorporation into compact substations and secondary distribution stations.

Industrial and Mining Premises Industrial and mining sites call for reliable medium-voltage switching and protective hardware to serve motors, transformers, outgoing feeders and local distribution grids. The sealed tank safeguards internal components against contamination and supplies all required switching, protection, isolation and monitoring capabilities for on-site power systems.

Railway and Transport Infrastructure Railway depots, airport utilities and associated transport infrastructure need consistent power supply across a wide spectrum of loads. Modular switchgear can be configured with custom feeder and protection schemes within a centralised distribution system, assisting integrators in developing compact medium-voltage power solutions for transportation projects.

Urban Distribution Networks Available land is generally scarce in city centres and residential neighbourhoods. Compact gas-insulated switchgear can be deployed within substations and distribution hubs where traditional air-insulated switchgear would demand far larger installation space. Its closed tank structure also lessens ambient interference acting on the primary circuit.

Coastal and Highland Sites Standard electrical equipment is susceptible to high humidity, salt contamination, altitude effects and sharp temperature fluctuations. USRM6’s enclosed primary circuit cuts down direct exposure to these harsh conditions. Project teams can analyse site-specific operating parameters at the selection stage to confirm the most suitable configuration and working settings.

Guidance for Equipment Selection

While sourcing 24kV and 33kV SF₆ GIS, buyers should review the full electrical scheme rather than making purchase decisions based solely on rated voltage. Technical assessment needs to cover rated voltage levels, insulation requirements, circuit breaker or load switch options, feeder quantities, busbar arrangements, earthing schemes, protection and metering functions, installation altitude, temperature, humidity, pollution grade, communication interfaces, and compliance with applicable IEC and GB standards.

Usune’s engineering team collaborates with project engineers and system integrators to define a tailored USRM6 configuration based on single-line diagrams and actual site operating conditions.

Why Partner with Usune?

Strict Quality Assurance Usune maintains formalised quality assurance workflows covering manufacturing, factory acceptance testing and product dispatch. ISO 9001 standards underpin stable production quality, while ISO 14001 and ISO 45001 frameworks govern environmental stewardship and occupational health and safety management.

Tailored Modular Configurations Usune offers flexible module combinations adapted to varied circuit functions and distribution requirements. This service suits EPC firms, electrical system integrators, distributors and procurement teams who require switchgear customised according to designated electrical drawings.

Globally Recognised Compliance Product design complies with both IEC international standards and Chinese GB specifications, and CE certification can be provided. This arrangement supports customers targeting diverse overseas markets. Applicable standards and certification rules can be verified against destination country codes and project technical specifications.

Specialised Engineering Support For GIS projects, locking in the correct configuration before production commences is critical. Customers may share single-line drawings, rated voltage requirements, feeder schedules, altitude data and environmental details for technical consultation with Usune’s engineering team.

Technical parameters

Product structures

Cas-space Rocket Launch Project

During the Cas-space rocket launch project, the USRM6 series was brought in to handle medium-voltage power distribution across the launch facility, covering both its critical infrastructure and the electrical loads tied to it. Distribution switchgear at a launch site is expected to keep switching, protection, isolation and monitoring dependable for essential equipment as well as auxiliary installations — and to hold steady performance even inside a relatively confined electrical environment. Because the main circuit sits within an SF6-enclosed insulated structure, the USRM6 series largely shields it from external environmental conditions, a trait that matters most for specialized infrastructure operating under stringent requirements.

The switchgear's modular configuration likewise gave the arrangement enough latitude to match the project's distribution architecture. Functional units could be assembled in line with the power network design, and the expandable main bus created additional headroom for network configuration and future system planning. All in all, it was the blend of compact structure, enclosed insulation and modular design that made the USRM6 series a fitting medium-voltage distribution solution for the Cas-space rocket launch project — one that answered the facility's need for reliable yet space-efficient electrical infrastructure.

Standards and Certifications

The USRM6 series is designed with reference to applicable high-voltage switchgear and control equipment standards, including GB 3804-2004 for 3.6kV–40.5kV high-voltage AC load break switches, GB 1984-2014 for high-voltage AC circuit breakers, GB 16926-2009 for HV AC load break switch-fuse combinations, GB 1985-2014 for HV AC isolation switches and ground switches, and GB 3906-2006 for 3.6kV–40.5kV AC metal-enclosed switchgear and controlgear.

It also references GB/T 11022-2011 for common technical requirements for HV switchgear and controlgear, GB 4208-2008 for enclosure protection, GB/T 5582-1993 for pollution degree of external insulation, DL/T 404-2007 for 3.6kV–40.5kV AC metal-enclosed switchgear and controlgear, GB/T 13384-2008 for mechanical and electrical products, GB 191-2008 for packaging and transportation marks, and GB 311.1-2012 for insulation coordination in high-voltage transmission and distribution equipment.

Usune's quality and compliance framework includes ISO 9001 Quality Management System, ISO 14001 Environmental Management System, ISO 45001 Occupational Health and Safety Management System, IEC and GB standard compliance, and CE certification. Project-specific certification and applicable standards should be confirmed according to the destination market and technical specification.

FAQ

What is the main advantage of SF6 GIS?

The main advantage is the enclosed construction of the energized electrical components within an insulating gas environment. This enables a compact structure and reduces direct exposure of the main circuit to external environmental conditions.

What voltage levels are available?

The USRM6 series is designed for medium-voltage applications including 24kV and 33kV configurations. The exact rated voltage, insulation level, and configuration should be confirmed according to the project specification.

Can it be used at high altitude?

Yes. The specified service altitude is up to 4000 m. For installations above 1000 m, customers should inform Usune in advance so that appropriate gas charging pressure can be evaluated. Special requirements above 2000 m should be confirmed during technical design.

Is the configuration customizable?

The USRM6 series uses a modular configuration concept. Load break switch units, combination units, circuit breaker units, and expandable main bus arrangements can be selected according to the required electrical scheme.

Where is it commonly installed?

Typical applications include secondary transformer substations, industrial and mining facilities, railways, airports, urban distribution networks, residential areas, underground facilities, and locations with relatively demanding environmental conditions.

What information is needed for a quotation?

For an accurate quotation, buyers should provide the rated voltage, single-line diagram, number of feeders, required switching functions, circuit breaker or load break switch requirements, bus configuration, installation altitude, environmental conditions, protection requirements, and destination market.

Get a Project Quote

For medium-voltage distribution projects requiring compact dimensions, environmental adaptability, modular configuration, and reduced maintenance requirements, the USRM6 series provides a practical gas-insulated switchgear solution.

The USRM6 series from Usune combines enclosed SF6 insulation, modular functional units, expandable bus configuration, and switching, protection, measurement, and monitoring functions. Supported by ISO 9001, ISO 14001, ISO 45001, IEC and GB standards, and CE certification, Usune provides a project-oriented solution for customers evaluating 24kv 33kv Sf6 Gis Gas Insulated Switchgear for industrial, infrastructure, urban, and specialized power distribution applications.