When planning low-voltage overhead lines, it is necessary to consider the adjustment and transformation of existing overhead power line according to the development plan, various types of power consumption indicators and characteristics, and propose a power supply development plan. Here are the steps to plan:
(1) Electricity load survey: The power load is the basis for planning. Multiply the total kilowattage of the electricity load calculated by each unit by the load and the coefficient equal to the actual power kilowatts. Then consider the development of the next five years, and then provide the selection data of the distribution transformer address.
(2) Selection of transformer capacity: The transformer should be installed in the load center, and the convenience of management and replacement should be considered.
The capacity of the transformer is expressed in terms of apparent power in kV•A.
According to the calculation of the electric load and the layout of the distribution point, the electric load value within the power supply range of the distribution point can be determined. The value divided by the power factor of 0.8 is the capacity of the required distribution transformer. When there is a drainage load, the capacity of the distribution transformer should be selected according to their maximum load.
The area through which overhead lines pass from beginning to end is called the line path. Whether the route selection is appropriate not only affects the construction cost of the line, but also affects the operation and maintenance of the line. When selecting a route, you should go to the field to see it; when there is a topographic map, you should first make a preliminary selection on the topographic map.