Fully Sealed Gas Insulated Switchgear Technology Empowering Reliable Power Distribution in Complex Environments

Against the deep‑going advancement of urban power grid renovation, growing power distribution demand from industrial and commercial parks, and large‑scale construction of new energy power stations, distribution systems put forward higher requirements for switchgear in terms of environmental adaptability, operational reliability and space utilisation. Gas insulated switchgear (GIS) encapsulates all high‑voltage switching components inside metal tanks filled with insulating gas. Benefiting from its fully‑sealed structure, compact footprint and outstanding environmental resistance, it has become core equipment for 10‑35 kV distribution systems under complex operating conditions. Drawing on solid technical accumulation in high‑voltage switchgear, Zhejiang Deyan Electric supplies eco‑friendly gas insulated switchgear as well as 35 kV high‑current GIS cabinets, delivering safe and dependable power distribution solutions for urban grids, industrial‑commercial parks and new energy power stations.

I. Core Functional Value of Gas Insulated Switchgear

1. Integrated high‑voltage power control
GIS integrates circuit breakers, disconnectors, earthing switches, instrument transformers, busbars and connecting bushings within a single sealed metal gas tank. Insulating gas acts as the primary insulation and arc‑extinguishing medium to realise switching, protection and power transmission for distribution networks.

2. Harsh‑environment isolation & fault risk mitigation
All live components are enclosed inside gas compartments, shielding internal equipment from external dust, moisture, salt fog and pollution. This fundamentally lowers hidden dangers including insulation deterioration and external short‑circuit faults.

3. Space‑saving power distribution
Compared with conventional air‑insulated switchgear, GIS reduces overall equipment volume by over one‑third. It simplifies on‑site installation and commissioning, and effectively saves land resources and project construction costs.

4. Flexible combinatorial configuration
Functional units for incoming feeders, outgoing feeders, metering and bus tie can be freely combined according to actual grid schemes to match diverse distribution system layouts.

II. Mainstream Classification of GIS Products

1. Classified by voltage level
Main voltage specifications cover 10 kV, 24 kV and 35 kV. Among them, 35 kV high‑current GIS cabinets apply to high‑current working conditions such as large‑capacity load delivery and new‑energy grid‑connection scenarios.

2. Classified by insulating medium
Traditional GIS mainly adopts sulfur hexafluoride (SF₆), which possesses excellent insulation and arc‑extinguishing performance. Nevertheless, due to its strong global‑warming effect, it is gradually being phased out. Eco‑friendly gas insulated switchgear adopts dry air, nitrogen or mixed gas formulations. It satisfies insulation performance targets while greatly cutting environmental influence, and has become a key development trend across the industry. Deyan Electric provides both conventional and eco‑friendly GIS series, and can deliver tailored solutions according to project site surroundings and operating requirements.

III. Core Advantages of Fully‑Sealed GIS Equipment

● Superior sealed protection: Live parts are fully contained inside gas tanks with high protection grades, adapting to severe operating surroundings including high humidity, heavy salt fog, high altitude and heavy dust pollution.
● Compact layout: Occupies much less floor area than air‑insulated switchgear of equal parameters, well‑suited for underground distribution corridors, integration inside box‑type substations and land‑scarce downtown urban zones.
● Stable and reliable performance: Sealed gas compartments isolate outside environmental interference, bringing low failure probability and extended service life.
● Low‑maintenance design: Internal components feature long maintenance‑free cycles; daily operation only requires visual inspection plus gas tightness monitoring work.
● Flexible unit combination: Feeder, metering and bus‑coupling units can be assembled on demand to fit different system design schemes.

IV. Typical Application Scenarios

For old‑city underground utility tunnel distribution, roadside outdoor switching stations and distribution‑room upgrading in load‑intensive regions, GIS enables high‑reliability power supply within limited physical space. Within industrial and commercial parks, it serves as core main‑distribution equipment to guarantee stable power supply for manufacturing plants, commercial complexes and data centres. At new‑energy power stations, it applies to grid‑connection and power distribution links for photovoltaic, energy‑storage and wind‑power projects; its full‑sealed structure adapts to complicated outdoor field climates. It also delivers prominent performance in transportation infrastructure power supply, high‑rise building distribution and coastal high‑salt‑fog regions.

V. Key Factors for GIS Type Selection

● Voltage grade and rated electrical parameters: selected in compliance with project load and grid specifications.
● Insulating medium selection: choose SF₆ or eco‑friendly gas solutions based on environmental‑protection requirements.
● On‑site environmental conditions assessment: protection grade and anti‑corrosion configuration for salt fog, high altitude and dust‑polluted sites shall be confirmed.
● Wiring scheme and functional unit configuration: match incoming, outgoing and metering units according to system design.
● Intelligent‑function demands: reserve interfaces for remote monitoring, fault alarm and data uploading when unattended operation is required. Reasonable product selection shall take full‑cycle cost into consideration and balance initial investment against long‑term operation‑and‑maintenance expenditure.

About Zhejiang Deyan Electric Co., Ltd.

Zhejiang Deyan Electric Co., Ltd., located in Yueqing Economic Development Zone, Zhejiang Province, is a large above‑designated‑size local industrial enterprise. Its product matrix includes gas insulated switchgear, ring main units, box‑type substations, high‑low voltage switch cabinets, photovoltaic grid‑connection cabinets, cable branch boxes and outdoor switching stations. Products are widely deployed for urban power‑grid renovation, industrial power distribution, new‑energy power stations and municipal infrastructure construction.

Backed by a professional R&D team, the enterprise offers customised optimised solutions, and provides equipment selection as well as system configuration suggestions based on project capacity, voltage levels and field conditions. It covers both domestic and overseas markets; a dedicated foreign‑trade team offers professional product supply and technical support for global clients. For enquiries on GIS procurement and distribution‑system scheme consultation, please get in touch with Deyan Electric.