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Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Access free engineering resources from IEE Business—covering power design, circuit layout, equipment selection, and troubleshooting. Expert-developed guides help engineers, procurement, and project teams make better decisions. Stay ahead on smart grids, renewables, efficiency, and AI tools. Improve reliability, reduce downtime, and enhance outcomes with real-world solutions. Explore our knowledge hub today.

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China has successfully developed the world's first ±408 kV DC transfer switch.

Recently, China’s switchgear manufacturer independently developed the world’s first ±408 kV DC transfer switch, which has successfully passed the full set of type tests. This marks the official successful development of the product and represents the first breakthrough in DC transfer switches applied on the 400 kV pole line side.The Jinshang–Hubei UHV project is currently the world’s highest-altitude ±800 kV ultra-high-voltage (UHV) DC transmission project. It adopts China’s independently develo

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11/18/2025

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