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Distribution loss generally refers to the electrical energy that a substation or distribution station has to lose due to power distribution at work. Including the loss of the transformer, the impedance of the bus bar and the connection points, and the loss caused by electromagnetic radiation and other factors. Losses due to equipment in the distribution network.

Theoretical line loss calculation methods for distribution networks have been studied by foreign scholars since the 1930s.

Carrying out the theoretical line loss calculation of the distribution network can optimize the structure of the power grid, the dispatching operation mode and the analysis of loss reduction, and improve economic benefits. In actual work, power supply companies pursue the calculation method of theoretical line loss for distribution networks with fast calculation speed and high accuracy of calculation results. However, there are many factors that affect the calculation accuracy of theoretical line loss for distribution networks. Accuracy, the accuracy of mathematical models, and the accuracy of mathematical methods, among which the accuracy of raw data is absolutely dominant. However, due to the actual situation of the distribution network, to accurately calculate the theoretical line loss of the distribution network, the influence of these factors needs to be considered. Of course, some of these influencing factors have a greater impact and some have a lesser impact. Therefore, in the theoretical calculation of the theoretical line loss of the distribution network, under the condition of guaranteeing certain accuracy requirements, in order to facilitate the research, only the main factors are often considered, and the secondary factors are ignored.

In addition to the above-mentioned influencing factors, human error, the accuracy of the measurement instruments and calculation tools used also affect the accuracy of the theoretical line loss calculation of the distribution network. For these influencing factors, some of them cannot be considered in the calculation model, and standards need to be formulated and considered according to the actual situation.

In short, the accuracy of the theoretical line loss calculation of the distribution network is the result of a combination of factors. Only by properly analyzing the various factors that affect the theoretical line loss calculation of the distribution network, can it be reasonable, accurate and scientific.