No abstract

The technical and economic aspects and the possibility of the mesh network topology offering many radial configurations lead to the fact that large municipal networks are generally under radial operation. However, it is very important to analyze the operation and control of the mesh networks, especially in terms of their safety and durability and in the frame of the smart grid concept, respectively. The article deals with the analysis of the operation of the dense-mesh municipal distribution network of E.ON Distribuce a.s. based on the long-term data from power quality monitors. It also shows a brief view of the current lack of data usability from monitors installed in distribution networks in the context of smart grid.

Power line communication (PLC) is considered one of the possible communication technologies for applications in the field of smart metering, smart substations, smart homes, and recently for the management of renewable resources or micro grid control. This article deals with the use of PLC technology to determine the technical condition of the cable. This coefficient can help distribution system operators (DSO) to assess the condition of their cable routes. In this way, possible cable breakdowns and subsequent power outages can be prevented. The resulting methodology for calculating the coefficient is presented in two specific examples of routes, in which a significant benefit for DSO’s can be found.

No abstract

Over the last decades computer power has grown and it is now possible to use computers for solving any electromagnetic problem by the approach of solving rigorous electromagnetic field (EMF) equations (Maxwell´s equations). With the use of this technique, it is possible to easily model an earthing system (ES) with a uniform or non-uniform soil model. This paper thus points out to the possible error between the analytical and EMF approach when determining ES resistance that has a crucial effect on resulting human safety. Three different ESs of distribution system substation were modelled using EMF simulation software (Ansoft Maxwell) for uniform and two layer soil models. The expected earthing resistances were determined for the ES models and compared with the values obtained by an analytical uniform soil model. The calculation was done for two different values of surface soil resistivities as well as for four different values of the surface layer thickness. Both values were compared which indicated the possible error that is being made when using an old analytical approach.