In global medium-voltage power distribution and substation construction, the choice between core equipment directly determines project cost, operational stability, and long-term maintenance efficiency. Air insulated switchgear and gas insulated switchgear (GIS) are the two dominant technical solutions widely adopted in utility grids, industrial parks, and new energy power stations. While GIS is renowned for its compact structure for space-limited scenarios, air switchgear stands out for its mature technology, flexible scalability and outstanding operational stability. Backed by rigorous manufacturing standards and field verification, our equipment has achieved 5-year trouble-free overseas AIS operation in multiple international projects, winning consistent recognition and active client referrals from global partners. Meanwhile, reliable air insulated substation construction solutions further consolidate the practical value of AIS technology in overseas power infrastructure development.
With the rapid expansion of overseas power engineering projects, EPC contractors and grid operators no longer focus solely on initial equipment costs, but pay more attention to long-term operational reliability, low maintenance costs and project adaptability. Traditional equipment selection often falls into a one-sided misunderstanding of "GIS is superior and AIS is backward". In fact, matched with high-standard production and precise engineering design, air insulated switchgear can deliver ultra-stable long-term operation, fully meeting the rigorous demands of overseas complex working conditions, and its comprehensive cost performance far exceeds expectations.
What Are AIS and GIS: Core Definition & Operational Logic
Air insulated switchgear is a classic medium-voltage power distribution device that uses atmospheric air as the insulating and arc-extinguishing medium. It adopts an open modular structure, with clear equipment layout and intuitive operating logic, which is convenient for daily inspection and fault troubleshooting. As a simplified and practical power distribution solution,air switchgear is highly adaptable to most conventional power distribution scenarios and is the core equipment for building standardized air insulated substation projects.
Gas insulated switchgear (GIS), by contrast, relies on sealed SF6 insulating gas to realize internal insulation and arc extinction. It features ultra-compact size, strong environmental adaptability and low daily maintenance demand, and is mainly applied in urban core areas, underground substations and other scenarios with extremely limited land resources. However, its high manufacturing cost, complex installation and difficult later transformation have become prominent constraints for large-scale promotion in overseas ordinary power projects.
AIS vs GIS: Comprehensive Comparison for Overseas Project Selection
To help global clients and engineering teams make scientific selection decisions, we comprehensively compare the two core devices from multiple dimensions combining overseas project operation experience:
Project Cost: GIS requires high-precision sealed manufacturing and professional gas detection equipment, with 2-3 times higher initial investment than AIS. Air insulated switchgear features lower equipment and civil engineering costs, with no additional gas maintenance expenses, delivering more prominent long-term economic benefits for large-scale overseas projects.
Installation & Scalability: GIS is a highly integrated sealed module, with complex on-site commissioning and difficult later expansion and transformation. air switchgear adopts a modular assembled structure, with simple on-site installation and flexible layout adjustment, which can quickly adapt to the capacity expansion and upgrading demands of air insulated substation and industrial power distribution projects.
Operation & Maintenance: GIS requires regular gas leakage detection and professional technical maintenance, with high technical threshold and maintenance cost. AIS has a simple internal structure; faults are visually identifiable and components are easy to replace. Standardized maintenance can be completed by local engineering teams, which is more in line with the operation and maintenance capabilities of most overseas regional projects.
Environmental Adaptability: Sealed GIS is barely affected by external environment, suitable for extreme compact scenarios. High-quality AIS with optimized anti-corrosion and dustproof design can stably adapt to coastal salt fog, industrial pollution and high-temperature environments, fully meeting the operational demands of most overseas infrastructure projects.
Core Advantage: 5-Year Trouble-Free Overseas AIS Operation & Client Referrals
The biggest advantage of high-quality AIS equipment lies in its stable long-term field performance. Different from ordinary low-end air insulated switchgear products that are prone to oxidation, poor contact and frequent faults in overseas complex environments, our optimized air switchgear has achieved full-scenario stable operation in multiple overseas projects, realizing authentic 5-year trouble-free operation.
This excellent operational performance stems from our strict manufacturing control: optimized busbar anti-corrosion treatment, precise mechanical debugging of withdrawable modules, standardized interlocking safety design and strict factory testing. All equipment is manufactured in accordance with IEC international standards, fully adapting to the climatic environment and grid operation specifications of the Middle East, Southeast Asia, Africa and other regions. Whether applied in industrial power distribution or air insulated substation construction, the equipment maintains zero major faults, stable current carrying and safe circuit protection throughout the operation cycle.
Reliable field performance brings high customer recognition. Up to now, our AIS equipment has obtained continuous client referrals from overseas cooperative EPC contractors and end users. Many long-term partners take our stable AIS products as the preferred equipment for new projects, forming a good market reputation relying on practical operational results rather than empty marketing promotion.
Applicable Scenarios: When to Choose AIS Instead of GIS
Combined with overseas engineering experience and user feedback, AIS is the optimal choice for most conventional overseas power projects. It is highly suitable for urban grid upgrading, industrial park power distribution, photovoltaic and wind power supporting substations, rural power grid reconstruction and other scenarios with sufficient land space and cost control demands. For projects pursuing long-term stable operation, low maintenance pressure and high cost performance, mature and reliable air insulated switchgear can completely replace high-cost GIS and create lasting operational value for clients.
Conclusion
There is no absolute superiority between AIS and GIS, only the most suitable solution for project demands. GIS is irreplaceable for ultra-compact space-constrained scenarios, while air switchgear relying on mature technology, low comprehensive cost and ultra-stable long-term performance, has become the mainstream choice for global medium-voltage power distribution and air insulated substation projects. Our verified 5-year trouble-free overseas operation and stable client referrals fully prove the high reliability of optimized AIS equipment. Adhering to the brand philosophy of Smart Power, Safe Life, we will continue to provide high-quality, low-maintenance and long-life air insulated switchgear solutions for global power infrastructure construction, and help more overseas partners reduce operational risks and maximize project benefits.
About us
Zhejiang Lvma Electric Co., Ltd. (founded 2018) builds on 17 years of specialized electrical equipment knowledge under ISO 9001:2015 certification. Our core product range includes intelligent switchgear systems and oil-immersed and dry-type distribution transformers, exported to Europe, the Middle East, South America, Southeast Asia, and Africa.
Our R&D team, backed by over 40 patents, is guiding the company's transformation into a smart energy solution provider. By adopting digital manufacturing and real-time monitoring, we consistently supply electrical systems that are safe, efficient, and engineered for long service life.