Machinery & Energetics

The proposed formula for determining the amount of electrical energy that is allocated per one switching cycle in one contact and calculated the loss of electricity for a single switching of the arc by an electromagnetic starter with serial and research contact materials. The aim of the work is to establish the relationship between the thermophysical characteristics of the contact material, the parameters of the electrical network and the magnitude of the energy losses during arc commutation. The objects of the experimental study were contact-parts manufactured from serial (CpM 0.2 + M1) and research (81.3% Cu + 10% Cr + 2.0% TiB2 + 3.0% + Nb + 2.0% C + 0,7% Zr) of contact materials. They were used in electromagnetic starters PML–1100. Oscillograms of current and voltage are obtained using a universal two-beam storage oscilloscope C8-14. Reduction of the burning time of the electric arc during commutation of the current can be achieved by introducing into the composition the following components C, Mo, MoO3, Cr. The economical efficiency of the application of the PML-1100 starters with experienced contacts is achieved due to the significantly lower cost of contact parts (approximately 22 to 25 times). The consumer is provided with a 6 % loss of electrical energy, which is released when switching the current in the contacts.

electric power losses, electric apparatus, electric arc, contact system, electromagnetic starter, environmentally safe composite material, metal-ceramic contact