Considerations Regarding the Earthing Electrodes for Low-Voltage Electrical Installations
Some considerations regarding different earthing electrodes types and arrangements are discussed. The computation of the earthing resistance and voltage distribution, the designing, installation and testing procedures are evaluated and compared. Typical mistakes, inadvertences, wrong or incomplete procedures are outlined, e.g. the soil resistivity ...
By Liviu Neamt, Horia Balan, Olivian Chiver, Alexandru Hotea
Reactive Power Consumption Analysis of a Medium Sized Factory
The paper achieves a study on the reactive power consumption in case of a medium sized factory. The factories as others industrial consumers usually have the power factor lower than the neutral one, which in Romania is 0.92; that is why these types of consumers have to pay for reactive power. The reason for the power factor is small (sometimes much...
By Olivian Chiver, Liviu Neamt, Cristian Barz, Eleonora Pop, Zoltan Erdei
Network control of Simatic S7-1200 PLCs for industrial processes
The paper presents different types of controlling and monitoring an industrial process through web interface, depending on the connection types made by PLC or HMI used in the process. We can control the industrial processes through HMI interface directly on the web or phone if we use a Weintek HMI in connection with a SIEMENS PLC for manipula...
By Barz Cristian, Klaus C Jalba, Nicolae Ungureanu, Chiver Olivian, Ioana Tascu, Sinisa Dragutinovic, Dragan Felicia
Study on the End Winding Inductance of Three-Phase Windings in Two Layers
The paper deals with the problem of determining the stator end winding inductance of A.C. machines. It refers to the two-layer windings with shortened pitch, the relative pitch being less than one. The inductance has been determined by numerical analysis based on finite elements method (FEM), the procedure being described in this paper. In or...
By Olivian Chiver, Liviu Neamt, Cristian Barz, Eleonora Pop, Cristinel Costea, Zoltan Erdei
Analysis of the Commutation Overvoltage in Photovoltaic Power Generation
Photovoltaic (PV) power generation is not only clean green energy but is also especially appropriate for smart grids with distributed power generation. For a good exploitation of a PV system there are some regulations to be respected in accordance with local normative. Voltage and reactive power are two very stringent variables to be monitored. Dur...
By Liviu Neamt, Liviu Petrean, Olivian Chiver, Mircea Horgos, Sorin Sava, Alexandru Hotea