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Rated voltage of the power supply system
- Jul 03, 2018 -

transmission and distribution lines

The rated voltage of the power grid is equal to the average value of the Voltage at the end of the line. This voltage is used as the basis for determining the rated voltage of other power equipment. The rated voltage of the generator is 5% higher than the voltage of the same power grid.

The rated voltage of the power transformer is divided into primary and secondary windings. For the primary winding, when the transformer is connected to the end of the grid, it is equivalent in nature to a load on the grid (such as a factory step-down transformer), so its rated voltage is consistent with the grid; when the transformer is connected to the generator outlet (such as a power plant) For step-up transformers, the rated voltage should be the same as the rated voltage of the generator. For the secondary winding, the rated voltage refers to the no-load voltage. Considering the voltage loss of the transformer (in 5%), the rated voltage of the secondary winding of the transformer should be 5% higher than the rated voltage of the grid. In the long run, the line voltage loss (in 5%) should also be considered. At this time, the rated voltage of the secondary winding should be 10% higher than the rated voltage of the grid.