SIMULATION OF LAWS OF CHANGE IN TECHNICAL CHARACTERISTICS OF CIRCUIT BREAKERS OF VARIOUS MANUFACTURERS

Ilhomjon Qodirov

Authors

 

Gracheva E.I. – doctor of Technical Sciences, Professor, Department of Power Supply of Industrial Enterprises, Kazan State Power Engineering University, Kazan, Russia, grachieva.i@bk.ru

Mukhanova P.P. – Master’s student, Department of Power Supply of Industrial Enterprises,Kazan State Power Engineering University, Kazan, Russia, muhanova-polina@mail.ru

 

Annotation

 

 The article considers technical characteristics and criteria for choosing parameters of efficiency of functioning of low-voltage electrical devices of different producer companies IEK, Kontaktor, DEKraft, Legrand, ABB, Schneiderelectric and Chint. A comparative analysis of operational parameters and cost indices of circuit breakers of various types and manufacturers was made. Approximating models of functional dependences of changes in power losses in contact systems of low-voltage apparatuses on the example of circuit-breakers were made. Consequences of power losses variation in contact systems of low-voltage switching apparatuses by calculation and experimental methods were determined. Dependences of power losses on nominal current are plotted. The problem of determining the character of dependence and modeling the laws of power loss variation in the contact systems of low-voltage switching devices from their nominal parameters is set. Graphs of approximating function of power loss dependence on rated current for circuit-breakers of different manufacturers are presented. The value of the standard deviation for approximating functions was calculated and the approximating functions with the smallest standard deviation were determined. It was found that logarithmic function is the most accurate for approximation. It is revealed that the obtained dependences allow determining the power losses of a circuit breaker at any rated current. The obtained results are recommended to be used for specification of power losses in low-voltage shop networks.

 

Keywords

 

circuit breaker, power loss per pole, standard deviation, approximating function, rated current

 

References

 

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  6. Shagidullina A.V., Gracheva E.I. Comparative study of the operational characteristics of low-voltage apparatuses // Izvestiya VUZov. Energy problems. 2011. No. 1-2. URL: https://cyberleninka.ru/article/n/sravnitelnoe-issledovanie-ekspluatatsionnyh-harakteristik-nizkovoltnyh-appartov (date accessed: 10/11/2020).

 

Publication date

2023-10-27