• China Shenhua Energy said Shendong Coal won a national invention patent for a phase sequence identification device.
• The device targets phase sequence wiring errors in microprocessor-based protection systems used in underground high-voltage coal-mine distribution equipment.
• The company expects fewer shutdowns for corrective rewiring, lower underground maintenance workloads, improved power-supply safety, and more reliable metering data.
• The patent was announced on 2026-09-11.

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