Waldemar Zając-Domański

Requirements relating to Open Area Test Sites (OATS) during measurements of radiated electromagnetic disturbances are precisely defined in standard PN-EN 50121-3-1. A significant problem arises during tests of public transport traction vehicles, such as trams and trolleybuses. In these cases, the choice of test site, with some exceptions, is limited to city agglomerations, where most of the tracks and catenaries are located. For this reason, choosing a test location that fulfils general requirements and is exposed to low levels of electromagnetic disturbance emissions from external sources can be difficult. It often requires an analysis of the emission sources and their potential elimination. The article looks at the requirements of applicable standards regarding correct measurements of radiated disturbance emissions. Selected examples of actual results of electromagnetic background emission with their interpretation are also presented.

The article presents the methods of determination and analysis of the continuance of harmonics in the supply current of a modern subway vehicle with an asynchronous converter power. Knowledge of the harmonic content of the supply current is a very important part of the study, allowing the vehicle to operate. In order to determine the harmonic voltages and currents, a computer model of the test vehicle and the power supply and subway substations was created. The simulation was created using the SimPowerSystem library, which is part of the Matlab program. The calculation results were compared with the measurement.

This article presents the concept for using an LLC resonant converter equipped with a medium-frequency transformer to upgrade the existing EU 07 locomotive into a dual-system vehicle. The work was created which sets out the specification for such an upgrade, but the design was eventually rejected by the investor and it became the subject of a diploma thesis.