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Vol. 28 (2025 year), No. 4, DOI: 10.21443/1560-9278-2025-28-4/1

Verstunin A. Yu., Gracheva E. I., Petrov A. R., Abdullin L. I.
Application of the developed computer model to study the technical characteristics of low-voltage switching devices using the example of circuit breakers

The paper examines the issues of assessing the technical characteristics of circuit breakers (CB) installed in electrical networks of industrial enterprises. The aim of the work is to model the main technical parameters of the CB contact system: heating temperature, contact resistance and active power losses per pole of the device. The computer model has been developed in the COMSOL Multiphysics software package, the geometry of the contact system of the device has been made in the Solid Edge program. The obtained modeling results are compared with the calculated and experimental data, as well as with the data regulated by GOST 60947-2-2021, GOST 60898-1-2020 and GOST 403-73. Modeling errors are determined. The contact heating temperature and active power losses per pole, determined using the developed model as factors of operational efficiency, make it possible to increase the accuracy of assessing the technical condition of the devices. At the same time, the values of the heating temperature of the contact connections coincide with the data after 28-day tests of the CB according to GOST 60898-1-2020. Therefore we believe that the obtained data correspond to the experimental values of the heating temperature of the contact connections of the device. Power losses per pole of the studied devices do not exceed the values established by GOST 60898-1-2020. It has been found that the values of the resistance of the CB contact connections determined using the computer model are comparable to the experimental data. The use of the computer model will reduce the time for revision when designing the CB structure, as well as determine the optimal geometric parameters, contact pressure and roughness of the contact system. In the future this will allow us to predict the state of the CB contact system.

(in Russian, стр.14, fig. 11, tables. 4, ref 16, AdobePDF, AdobePDF 0 Kb)