Voltage class is a series of rated voltage levels for power systems and power equipment. The rated voltage is the normal voltage specified by the power system and the power equipment, that is, the nominal voltage related to certain operating characteristics of the power system and the power equipment. The actual operating voltage at each point of the power system is allowed to deviate from its rated voltage to a certain extent. Within this allowable deviation range, various power equipment and the power system itself can still operate normally.
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