Search results

The article contains methodology for assigning losses in two-element frequency converter (in rectifier and dc-ac converter). which allow to replenish mathematical model of back to back rig test method for induction motors and to use it in design induction motor rig test, also for calculation electrical power test rig which consumed from electrical network. Practical value of the methodology is no need in using electrical measurement instrument for ac-dc power with frequency different from 50 Gz.

Each of the proposed circuits is composed of inverters. These devices are sources of non-sinusoidal voltage, whose frequency can vary within a wide load range of the test engine. Therefore, to measure the power in such conditions requires either the use of special complex of hardware-software complexes to perform the direct measurement or the development of indirect methods for determining capacity. Such methods proposed for each of the schemes. The essence of the developed methods consists in a preliminary experimental determination of the dependency of the losses in the rectifiers and rectifier-inverters circuits from the power supplied to him. These dependencies are further processed during the test, using only the General-industrial electric meters that measure power consumed by the frequency Converter, and the power consumed (generated) asynchronous motors is determined by the indirect (calculated) by. On the other hand, pre-experimentally received dependence of losses in frequency converters from power consumption trolled (generated) asynchronous motor energy, you can calculate the power consumed by the frequency Converter from the network in a wide range of loads that can be used in the design of testing stations for asynchronous traction motors.

Special attention on the Belarusian Railway is paid to the issues of operation of curved-linear sections of the track, since in the framework of solving the problem of increasing train speeds; one of the significant obstacles to changing the speed regime is the discrepancy between the actual position of the curve of the project documentation. The automated systems of mobile diagnostic tools used on the road fully allow us to evaluate the actual parameters of the curves, which can form the basis for modeling the desired positions of the curves for the purpose of their certification. For this purpose, various orders and orders are drawn up annually, which set the main parameters of the curves in the plan and level, as well as the volume of work on the reconstruction (modernization) of the curves in order to bring them to the project documentation. In the Methodology introduced at the Belarusian Railways for evaluating the actual parameters of the installation of curves of track sections, general provisions given for the regulations that determine the procedure for performing actions when performing qualitative and quantitative assessments of the parameters of the geometry of the rail track. Depending on the state of the actual parameters, it is assumed that the curve will be assigned a certain status, which determines the order of its further operation, and depending on the ratio of the actual parameters relative to the design parameters, the degree of violation. The parametric analysis of this technique allowed us to generalize the results of structural, functional and informational analyses of the order of assessment of the level of disorder of curves, with assigning them the appropriate status, and the value of indicators that determine the degree of violation. The study of the parameters of curved sections revealed discrepancies in the qualitative and quantitative estimates of the same track sections, as well as the need for a comprehensive assessment of the actual and design parameters of the rail gauge geometry.