IMPROVING THE ACCURACY OF METHODS FOR DETERMINING LOSSES IN LOW-VOLTAGE POWER SUPPLY NETWORKS

Accurate determination of electrical energy (EE) losses during design is important for optimizing the network structure, selecting the locations and number of distribution devices, and determining cable and wire cross-sections. Statistical data show that EE losses in low-voltage distribution networks account for approximately 4 to 20% of total electricity consumption. The article investigates the main factors determining the equivalent resistance of a mixed section of a workshop network. It presents changes in the resistance of sections of an industrial enterprise's power supply system depending on the load factor of the equipment and the heating temperature of conductors and cable lines. Factors affecting the equivalent resistance of the circuit have been identified: resistance of low-voltage switching devices (LVD), conductor heating temperature, ambient temperature, and device load coefficient. Errors have been identified due to the failure to take into account the main parameters of the equipment when calculating the equivalent resistance of a mixed network scheme. It has been established that the error when contact resistance of NCA connections is not taken into account reaches 77%. The total error in estimating the equivalent resistance when the main parameters of the equipment under study for radial, trunk, and mixed schemes are not taken into account can be 45%. The results obtained can be recommended for use to improve the reliability of estimating electrical energy losses in internal electrical networks.

low-voltage networks, electrical switching devices, contact connections, contact resistance, сonductors, cable lines.

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2026-03-30