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This paper presents the detection method and analysis methodology of dynamic stray current effects on underground pipelines based on simultaneous multiparametric measurements in combination with continuous wavelet cross‐correlation and frequency plots. Measurements presented within this paper were conducted at two locations experiencing tram induced dynamic stray currents, in the first case, on unprotected...
State estimation is a basic function, which results are used in almost all other functions for the analysis, management and planning of distribution networks. The paper describes the process of load calibration that is one of the basic steps in the process of state estimation in the distribution network. Algorithm for state estimation of a radial distribution network used in this paper is based on...
Corona on transmission line conductors is a significant source of electromagnetic interference and corona loss. In order to analyze variable atmospheric condition on corona inception voltage gradient of bundle conductors a calculation model was established. The voltage gradient around stranded conductors for calculating corona inception voltage gradient is required. For the high voltage transmission...
This paper deals with method for evaluation of quality of the impulse high voltage measuring system. The purpose of assessing the quality of the impulse high voltage measurement system is to determine whether the measurement system is suitable for use in the appropriate measurements. Firstly, paper describes components of impulse high voltage measuring system. Main characteristics of measuring systems...
Cathodic protection (CP) is a technique that is used for protection of underground and underwater metallic structures from corrosion. Design of cathodic protection system requires defining of protection current density and potential. These parameters must meet given criterions during the exploitation of cathodic protection system. This paper deals with problem of modelling of the cathodic protection...
This paper deals with design of the substation grounding system by using computer. As it is well known, proper design of the grounding system is most important part of the whole project of the substation, from safety point of view. Procedure of the measurement of the soil resistivity and interpretation of the measured results is given. Interpretation of the soil resistivity data and results of interpretation...
In real high voltage systems, it is necessary to observe system parameters. Depend on investigated values, it is possible to detect malfunctions or overvoltage in high-voltage substation. Because of these, communication system in actual high voltage substation is implemented. In the high-voltage substation disconnector and circuit breaker are installed, whose operation causing appearance of impulse...
Investigations of the electromagnetic interference indicate that disconnecting switching of the off-loaded busbars is one of the most important sources of electromagnetic interference in the secondary circuits of a power station. Disconnector's contacts in air-insulated substations (AIS) move slowly causing numerous strikes and restrikes between contacts. Every strike causes high-frequency currents...
Grounding systems have the most important role in safety of staff and substation equipment and therefore they require detailed analysis of relevant parameters. This paper discusses the possibility of application of software packages based on finite element method (FEM), when conducting analysis of grounding systems. Firstly the paper describes a mathematical model with assumptions on which is based...
This paper presents measuring results of transferred overvoltages in the secondary circuits of instrument transformers caused by switching operations of disconnector in air insulated substations 220 kV, in Bosnia and Herzegovina. Obtained results show that the maximum amplitude of these overvoltages can be up to 940 Vpeak (220 kV hydroelectric power plant Grabovica). In order to ensure electromagnetic...
This paper presents the application of coupled 1D and 2D isoparametric discontinuous boundary elements for calculation of large grounding systems. Indirect method of boundary elements was applied. Parts of long thin grounding conductor (e.g., tapes, grids, mashes or rods) are discretization with a 1D linear isoparametric discontinuous boundary elements. Boundary surfaces of solid grounding conductor...
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