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This paper is focused on the description and comparison the alternative photometric and radiometric methods for liquid dielectric quality diagnostic and parameters measurement, long-term practical verification and comparison of obtained data with conventional methods. The proper function and accuracy of the measured methods are verified in the Light Laboratory and in the CVVOZEPowerLab in Brno University...
This paper is focused on the description of phenomenon called "floating water bridge" and several experiments in our high voltage laboratory which are joined with this phenomenon. Water bridges bring some new knowledge in chemistry, electrochemistry, lighting technology and high voltage field. In this paper we will be dedicated space for describing the properties of water bridges in the...
IEC 61850 standard has achieved the required development for the communication in the Substation Automation Systems (SASs) by allowing to apply the high-speed peer-to-peer communications that is the basis of metering, control and protection applications in SASs. Nevertheless, an appropriate test method for performance testing of IEC 61850 compatible with protection relays and systems is an urgent...
This paper deals with the description and of the mathematical model of compensated MV distribution network. The model was created in PS Cad in order to solve the ground faults localization using the method of the additional grounding of the healthy phase. This method was experimentally tested for different types of ground faults. The comparison of the measured values and the simulation results is...
The paper is focused on the operational experience with an automatic system for additional earthing of the faulty or healthy phase during an earth fault. The system is primarily used for limiting of a fault current in the point of the fault by earthing of the faulty phase during an earth fault. The equipment for additional earthing of faulty phase can also be used for short-time connection of healthy...
The paper is focused on the operational experience with an automatic system for suppression of a fault current during a ground fault by the additional earthing of the faulted phase in a supply substation. Such system was experimentally installed in the Brno-Medlánky 110/22 kV substation. To verify the benefits of the system as well as to assess its possible failings, twenty-four experimental measurements...
A connection between a phase conductor and the ground in a compensated MV networks is called an earth fault. Since the fault current in this case does not depend on the point of the fault, but only on the total capacity (size) of a network, earth fault location remains a problem for MV network operators. The MV compensated Networks in Czech Republic are operated as nonsymmetrical, that means as networks...
A connection between a phase conductor and the ground in MV networks is called earth fault. The fault current in this case does not depend on the point of the fault, but only on the total capacity (size) of a network. Distribution system operator (DSO) sometimes needs to operate the large network which means operating of the network with big capacitive current (in Czech Republic more than 800A). This...
The paper deals with the description and analysis of the method of the additional earthing of the affected phase used for the elimination of the fault current during an earth fault in a compensated network. The efficiency of this method is strongly influenced by the fault location and resistance and, in some cases, its application can lead to deteriorating the situation at the point of the fault and...
In recent years, an increased number of windstorms has led to a surge in damage of 22 kV and 35 kV lines caused by fallen trees. Those incidents result frequently in long power outages and increased maintenance costs of distribution networks. This paper is inspired by a recent trend consisting in the replacement of concerned sections of overhead lines by cables. Such an approach is called “cable sections...
The paper deals with earth fault phenomena in MV compensated networks. There were damaged concrete towers in E.ON Czech Republic distribution network and the aim of experiment was to measure electrical values during the fault. The experiment was prepared and six types of fault for tuned and untuned Petersen coil and for two distances between busbar and point of fault were subsequently connected. The...
In recent years, an increased number of windstorms has led to a surge in damage of 22 kV and 35 kV lines caused by fallen trees. Those incidents result frequently in long power outages and increased maintenance costs of distribution networks. This paper is inspired by a recent trend consisting in the replacement of concerned sections of overhead lines by cables. This solution brings numerous changes...
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