GB/T 44768-2024 in English

National Standard of the People's Republic of China GB/T 44768—2024 Guidelines for the Theoretical Calculation of Line Losses in Distribution Networks

This standard applies to the theoretical calculation of line losses in distribution networks of $110\,\mathrm{kV}$ and below, mainly covering the theoretical calculation of power loss in AC and DC distribution networks, the summary of theoretical line loss electricity, and the calculation method of theoretical line loss rate.

Background of Standard Formulation and Analysis of Technological Evolution

With the development of distributed energy and smart grids, the complexity of distribution networks has increased significantly. Based on DL/T686 and DL/T1365, this standard clarifies the core requirements for the theoretical calculation of distribution network line losses in combination with the needs of new power systems, providing a scientific basis for loss reduction planning.

Comparative analysis of line loss calculation between AC and DC distribution networks

Implementation suggestions and application scenarios

Recommended use scenarios:

• Areas with a high proportion of distributed energy access
• Smart grid planning and optimization
• Loss reduction analysis and economic evaluation

Implementation suggestions:

1. Prioritize the collection of high-precision operating data to ensure calculation accuracy.
2. Select the optimal algorithm based on the grid structure, such as the power flow method for complex networks and the equivalent resistance method for simple networks.
3. Regularly update equipment parameters and operating conditions to ensure the timeliness of calculation results.