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The 6kV, 10kV, and 35kV power grids in the power system generally adopt a neutral point ungrounded operation mode.
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The box type substations in the United States are divided into two types: those with operation corridors (where staff operate inside the box) and those without operation corridors (where staff operate outside the box).
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European box-type transformer substation
The high voltage chamber of a European box transformer is generally composed of high voltage load switches, high voltage fuses, lightning arresters, etc. It can perform power outage and transmission operations and has overload and short circuit protection. The low-voltage chamber is composed of low-voltage air switches, current transformers, ammeters, voltmeters, etc. Transformers are generally made of S9 or dry-type. The electrical equipment components in the European box transformer are all selected from standardized products, and the technical performance of the components meets the corresponding standard requirements.
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