Effective January 1, 2026, China has officially launched GB/T 311.11-2025, a landmark standard for HVDC insulation coordination. By adopting IEC 60071-11:2022, China has bridged the gap with international tech standards. This is the new "rulebook" for the 800V DC power systems fueling today’s AI computing explosion, providing the essential technical guardrails for everything from design to hardware selection in high-voltage environments.
The standard tackles insulation safety through four critical pillars. It moves beyond generic rules to establish a specific logic for DC withstand voltage and quantifies requirements for lightning and switching impulses. For the hardware itself, it sets strict mandates for air clearance and creepage distances in converter stations and transformers. By factoring in harmonics and environmental filth, the standard ensures that the entire system—from cables to buses—remains insulated and stable over years of heavy use.
While it covers all HVDC systems above 1.5kV, its most vital impact is on the AI computing sector and renewable energy. It provides a technical roadmap for the 800V DC infrastructures that keep data centers running. From factory testing to final on-site acceptance, the standard ensures that components like converter transformers and DC filters are built to survive the high-stress conditions of LCC and other advanced architectures.
Ultimately, GB/T 311.11-2025 creates a "safety loop" alongside performance and testing standards. For the AI industry, this means fewer insulation failures and much higher reliability for power-hungry hardware. It’s not just about safety—it’s about giving Chinese HVDC equipment the technical credentials to compete on the global stage, providing a rock-solid foundation for the next generation of AI infrastructure.
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