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Sieyuan supplied six LW58A-252 dead tank circuit breakers and associated disconnectors for a 230 kV data center switchyard in the United States.
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.
Project Overview
Sieyuan supplied six LW58A-252 dead tank circuit breakers and associated disconnectors for a 230 kV data center switchyard in the United States.
Project Background
North American demand for IEEE and ANSI-compliant HV equipment outpacing supply.
Key Challenges
−20 °F to 120 °F service, 120 mph winds and seismic and NEMA requirements.
Sieyuan Solution
A mature LW58A-252 platform adapted to 230 kV with early technical clarification.
Technical Highlights
Localised NEMA and ANSI detailing plus high-reliability secondary design.
Project Overview
Project Background
With the aging U.S. grid infrastructure and surging demand for renewable energy integration and data center power capacity, the market for high-voltage transmission equipment compliant with stringent North American standards faces supply shortages. Leveraging its deep expertise in high-voltage technology, Sieyuan secured a contract to supply 230kV dead tank circuit breaker (DTCB) for multiple critical hub substations in a U.S. data center project. This initiative not only validates Sieyuan's product adaptability under harsh North American conditions but also establishes the company as a strategic partner for U.S. critical energy and data center infrastructure.
Key Challenges
Extreme Environmental Adaptability — Equipment must operate stably across a wide temperature range of -20°F to 120°F, withstand hurricane-level winds of 120 MPH, and meet seismic requirements, demanding exceptional mechanical strength and tank design for 230kV equipment.
Stringent Electrical & Mechanical Standards — Compliance with IEEE, ANSI, and NEMA standards was mandatory, including NEMA 3R enclosures, ANSI 70 gray paint specifications, and UL-certified secondary cables.
Customized Operations & Interfaces — Requirements included compatibility with field-testing devices, specific terminal block models, and detailed operational mechanisms.
Sieyuan Solution
Platform-Based Product Adaptation — The mature LW58A-252 dead-tank circuit breaker platform was adapted for 230kV applications, ensuring 50kA/40kA breaking capacity.
Proactive Technical Clarifications & Alternatives — Non-standard items were resolved via technical alternatives. Boundaries for relays like 52X/52Y were clarified to align with upstream protection systems.
Structural & Environmental Enhancements — Tank designs were reinforced per ASME Code for Unfired Pressure Vessels to meet seismic/wind loads, with added pressure relief discs and low-pressure trip-lock devices. Control cabinets underwent NEMA 3R sealing and integrated features like door lights and GFI outlets.
Technical Highlights
Localized Standards Implementation — Details like NEMA grounding hole spacing, ANSI 70 gray finish, and U.S.-spec outlets ensured seamless integration with North American grid equipment.
High-Reliability Secondary Design — Flame-retardant, tinned, multi-strand copper cables were used, with strict separation of control, power, and CT circuits, validated by 1500V/2500V withstand tests.
Flexible Commercial Strategy — Custom requirements were managed via clear pricing lists, balancing technical compliance with commercial viability.
Execution Excellence — All 80+ technical clauses were meticulously closed, showcasing Sieyuan's capability to resolve cross-standard complexities and deliver turnkey solutions for the U.S. market.
