Operation of any kind of machinery is always connected to efficiency and losses. The part of energy is always being dissipated to the surroundings. In the case of electric machines the losses result in heat generation. Present contribution introduces the numerical method for predicting and analysing the heat transfer including conduction, convection, and radiation at the specific operating regi...

This paper addresses issues related to reactive power, voltage support and transmission losses as dictated from a certain class of electric loads. Specifically, it addresses the impact of predominantly induction motor loads on voltage support, reactive power requirements, and transmission losses. These issues are examined with a model, which explicitly models the induction motor mechanical load...

We generalize a formula for the Goldreich-Julian charge density (ρGJ), originally derived for rotating neutron star, for arbitrary oscillations of a neutron star with arbitrary magnetic field configuration under assumption of low current density in the inner parts of the magnetosphere. As an application we consider toroidal oscillation of a neutron star with dipole magnetic field and calculate ...

In the recent years, many wind turbine generation systems (WTGS) have been installed in many countries. However the electric power obtained from wind generators is not constant due to wind speed variations. The generated electric power and the loss in WTGS change corresponding to the wind speed variations, and consequently the efficiency and the capacity factor of the system also change. In thi...

Soft switching has the potential of reducing switch stresses and of lowering the switching losses as compared to hard switching. For this reason, several soft-switching topologies have been presented in the literature. Each topology has some advantages. Their operation, however, requires additional active and/or passive elements. This introduces additional cost and complexity. To understand the...

The way in which electric power depends on the topology of circuits with mixed voltage and current sources is examined. The power flowing in any steady-state DC circuit is shown to depend on a minimal set of key variables called fundamental node voltages and fundamental edge currents. Every steady-state DC circuit can be decomposed into a voltage controlled subcircuit and a current controlled s...

In this article, additional electricity losses are calculated using the voltage imbalance factor. There is also a method for predicting extra in case of longitudinal and transverse asymmetry, as well information on how to measure power quality indicators. It suggested that home appliances be used monitor separate system's The findings investigations condition asymmetry conducted operational low...