Forecasting technical state and efficiency of electrical switching devices at electric complexes in oil and gas industry

Abstract

Abstract This work is topical, since it allows predicting the physical state of the contact joints of low-voltage switching devices and to avoid their destruction, which occurs due to mechanical and chemical effects on the contacts during operation, leading to an increase in the transition resistance and overheating of the contacts. The following criteria were adopted as serviceability criteria for the contact connections of switching devices: the maximum temperature of their heating, the maximum value of the resistance of the pole of the device and its parts, as well as the excess of the temperature of the contact heated part over the ambient temperature. The authors obtained graphs of the dependence of the resistance value of the contact connections of magnetic starters and circuit breakers on the ambient temperature and load factor. The article determines the analytical dependence of the resistance of the magnetic starter contact connections on the ambient temperature. It also features mathematical models that take into account various operating conditions of switching devices, the input values of which are refined using regression analysis.