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Comparison between Volcanic Rock Inorganic Mineral Full-Encapsulation Material and Busbars in Common Enclosures

At a coastal power plant, the 330 MW unit’s 6.3 kV, 3.6 kA auxiliary busbar system originally employed a common‑box busbar configuration. During humid, rainy conditions, the insulation resistance of the de-energized busbar would drop sharply, severely compromising its reliable operation. Moreover, under significant temperature differentials or in damp weather, condensation readily formed on the surface of the indoor busbar sections and on the insulating mounting partitions, occasionally leading to equipment failures.