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550 kV switchyard with Sieyuan disconnectors at a photovoltaic power station in Brazil

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Application of Sieyuan Electric 550 kV Disconnectors in a Brazilian Photovoltaic Project

In May 2024, Sieyuan Electric secured an order for 550 kV disconnectors for a large-scale photovoltaic power station in Brazil. Based on the GW23B-550W/4000-50 disconnector platform, the solution was customized for Brazil’s 60 Hz power system and tropical, heavily polluted operating environment. The project required customized solutions for insulation performance, mechanical structure, safety interlocking, secondary circuits, and maintenance. Sieyuan integrated these requirements into the disconnector configuration to support reliable operation and convenient maintenance.

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SYW6GZ-4000 DC switch-disconnector mounted in a battery storage combiner cabinet

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SYW6GZ-4000 DC Switch-Disconnector and Fuse-Combination Unit for a BESS Project in Poland

Sieyuan supplied the SYW6GZ-4000 DC switch-disconnector and fuse-combination unit with bilateral fuses for a 510 MW/1020 MWh grid-scale battery energy storage project in Poland. Designed for DC power distribution in a DC 1500 V system, the solution integrates the disconnector and fuse into a single unit to simplify cabinet integration, installation and maintenance.

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220 kV air-insulated switchyard with disconnectors and circuit breakers at a Kazakhstan wind farm substation

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Sieyuan Electric 220 kV AIS Circuit Breaker and Disconnector Solution for a Wind Farm in Kazakhstan

For the Shokparskaya 100 MW Wind Farm 220 kV AIS Project in Kazakhstan, Sieyuan Electric developed a customized solution for extreme cold and heavy icing conditions. The solution incorporates reinforced insulation components, enhanced external insulation, and a low-temperature operating mechanism to maintain reliable equipment performance. The complete solution passed environmental testing at -50°C, providing additional performance margin beyond the -45°C operating requirement. The solution also addressed and verified all 15 customer technical requirements, supporting reliable grid connection for the wind farm.

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Sieyuan LW58A-252 230 kV dead tank circuit breaker for a large-scale US data center switchyard

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230kV DTCB Deployment for a Large-Scale U.S. Data Center

In March 2025, Sieyuan Electric secured an order for a 230kV DTCB switchyard project serving a large-scale data center campus in the United States. The project includes 6 sets of LW58A-252 dead-tank circuit breakers and associated disconnectors. To meet stringent North American IEEE, ANSI, and NEMA standards—including environmental requirements for a wide temperature range of -20°F to 120°F and hurricane-level winds of 120 MPH—Sieyuan completed multiple deep customizations. These encompass NEMA 3R-rated control cabinets, UL-certified cables, and ASME pressure vessel-standard tanks. Sieyuan Electric will oversee the entire process from product design and procurement to on-site installation, testing, and commissioning supervision, ensuring compliance with U.S. grid delivery standards and the high-reliability power infrastructure demands of mission-critical data center operations.

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Sieyuan 230 kV gas-insulated switchgear commissioned at Singapore's Upper Jurong I substation

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Singapore Upper Jurong I Substation 230kV GIS Project

On April 29, 2026, the 230kV GIS manufactured by Sieyuan Electric and supplied to Singapore Power Grid's Upper Jurong Substation was officially commissioned. The product was independently developed, supplied, and fully technically guaranteed by Sieyuan Electric Co., Ltd. As a core strategic project of Singapore's national power grid upgrade, its successful commissioning not only strengthens power stability in western Singapore, but also signifies that Sieyuan's high-end GIS products have fully passed Singapore's rigorous technical and quality certifications — successfully gaining a foothold in the high-end power market of Southeast Asia.

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Sieyuan SYG6Z series 1500V DC rotary switch-disconnector used at an Arizona solar-plus-storage project

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Arizona Solar-Plus-Storage Project: DC Switching for Dual-Array Grid Integration

Sieyuan Electric's SYG6Z Series DC Rotary Switch-Disconnector was selected as the primary DC switching solution for a utility-scale solar-plus-storage project in Arizona, supporting the safe operation of dual solar arrays integrated with battery storage. Operating in one of North America's most demanding desert environments, the project required DC switching equipment capable of withstanding extreme heat, intense UV exposure, and high dust concentrations over a 30-year service life.

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Sieyuan MSC GREEN-24 SF6-free clean air gas-insulated switchgear at the Parana PV station

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24kV Eco-Friendly Switchgear Project for Paraná PV Station, Argentina

Sieyuan Electric's 24kV eco-friendly gas-insulated switchgear has been delivered to the Paraná PV station in Entre Ríos, Argentina. The project achieving zero GWP through Sieyuan's proprietary clean air insulation technology, completely eliminates the use of sulfur hexafluoride (SF₆) gas and meeting international zero-carbon standards.

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Sieyuan 420 kV gas-insulated switchgear at the main substation of a polysilicon plant in Oman

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420 kV GIS Solution Powering Oman's High Purity Silicon Industry

To support a large-scale high-purity silicon production plant in Oman's Sohar Free Zone, Sieyuan delivered a complete 420 kV and 252 kV gas-insulated switchgear (GIS) solution for the plant's main substation. Located in a demanding coastal industrial environment, the project required equipment capable of ensuring reliable operation under high temperatures, coastal conditions and strict safety requirements. The solution was designed to meet the requirements of Oman's grid operator OETC, local DGSM standards and international project expectations, providing a reliable power supply foundation for continuous industrial production.

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Sieyuan 40.5 kV medium-voltage switchgear line-up at a Chilean substation

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Sieyuan Electric Delivered 40.5 kV Medium-Voltage Switchgear for Atlas Estepa and Crucero Substations in Chile

Sieyuan Electric has delivered 40.5 kV-class medium-voltage switchgear for the Atlas Estepa and Crucero substations in Chile. Located in a high-seismic region of Chile, the project was subject to demanding requirements for equipment seismic performance, design compliance and supporting technical documentation. To meet applicable IEC standards and Chilean seismic requirements, Sieyuan Electric completed comprehensive design verification and seismic testing, provided the required technical documentation, and successfully passed project acceptance.

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