Modeling of contact heating temperature of lowvoltage switching devices with regard to operating modes
https://doi.org/10.30724/1998-9903-2026-28-1-42-53
Abstract
RELEVANCE. The paper presents an algorithm for measuring the temperature of minimum voltage devices based on regression analysis. THE PURPOSE. Development of regression models for determining the contact temperature of circuit breakers, contactors and magnetic starters.
METHODS. The obtained models were validated by Cochran and Fisher's criterion and the significance of each of the coefficients was assessed by Student's criterion.
RESULTS. Graphical dependences for determining the contact heating temperature of the apparatuses for a number of values of rated currents at an ambient temperature of 40°C were plotted. The graphs were also constructed for the investigated devices when the ambient temperature changes from 5°C to 40°C. The constructed graphs allow to determine the value of heating temperature without preliminary calculations for circuit breakers for rated currents 40A, 63A, 100A, 160A, 250A and for contactors and magnetic starters for rated currents 40A, 63A, 100A, 250A, 400A. The obtained values of contact heating temperature were compared with GOST 403-73.
CONCLUSIONS. Models for determining the contact heating temperature allow the technical condition of the apparatus to be taken into account and can easily be modified when conditions and operating modes change.
About the Authors
A. R. Petrov
Kazan State Power Engineering University
Russian Federation
Russian Federation
Almaz R. Petrov
Kazan
E. I. Gracheva
Kazan State Power Engineering University
Russian Federation
Russian Federation
Elena I. Gracheva
Kazan
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Review
For citations:
Petrov A.R., Gracheva E.I. Modeling of contact heating temperature of lowvoltage switching devices with regard to operating modes. Power engineering: research, equipment, technology. 2026;28(1):42-53. (In Russ.) https://doi.org/10.30724/1998-9903-2026-28-1-42-53
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