In China, the rated voltages of domestic factories are mainly 220V and 380V, and public * * * systems are mainly 6000V, 10.5KV, 13.8KV,10/0 kV, 220kv, 330kv, 550kv and 70 kV. Rated voltage refers to the best voltage when electrical equipment works normally for a long time. Rated voltage is also called nominal voltage. When the working voltage of electrical equipment is higher than the rated voltage, it is easy to damage the equipment, while when it is lower than the rated voltage, it can't work normally (for example, the light bulb is not emitting normally and the motor is not working normally).
Under rated voltage, electrical equipment, generators and transformers have the greatest economic benefits in normal operation. At this time, all components in the equipment are in the best working state, with stable performance and long service life. Setting the rated voltage of electrical equipment is beneficial to the standardization and serialization of electrical manufacturing.
Conducive to the standardization and selection of design, interconnection and replacement of electrical appliances, production and maintenance of spare parts, etc. In addition, it is necessary to standardize the rated voltage of the power grid in order to avoid the interconnection difficulties caused by the infinite expansion of the number of voltage levels. In order to obtain the best technical and economic performance, power equipment needs to be optimally designed, manufactured and used at rated voltage.
Extended data
Under rated voltage, electrical equipment, generators and transformers have the greatest economic benefits in normal operation. At this time, all components in the equipment are in the best working state, with stable performance and long service life. Setting the rated voltage of electrical equipment is beneficial to the standardization and serialization of electrical manufacturing and the standardization and selection of design.
It is beneficial to the interconnection and replacement of electrical appliances and the production and maintenance of spare parts. In addition, it is necessary to standardize the rated voltage of the power grid in order to avoid the interconnection difficulties caused by the infinite expansion of the number of voltage levels. In order to obtain the best technical and economic performance, power equipment needs to be optimally designed, manufactured and used at rated voltage.