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We deal with the numerical model of overheating of primary and secondary coils of voltage instrument transformer. Calculated values are compared with two different measuring methods — measuring with thermal sensors and calculation of heating from measured resistance. All calculations are solved in three operating conditions by rated voltage, thermal limiting output and rated voltage factor 1.9 Un...
The implementation of Reliability Centered Maintenance into Preventive Maintenance Plan scheduling is one of the possible paths towards cost reductions in the fields of diagnostics and operating personnel. There is also the assumption of maintaining acceptable reliability of individual devices within the entire network. The devices to be considered suitable for application of RCM concern network elements...
Companies in field of electricity distribution and transmission recently deal with the need for decreasing cost of operation in terms of both capital and operational expenditures. They start to use statistically driven approaches of asset management to support these requirements in a way that reliability of the grid is being kept on the same level or even improved. However, the behavior of the assets...
This paper focuses on modelling and subsequent comparisons of co-generation units with combustion engines. It provides substantial information about co-generation units. The document refers to a simulated co-generation unit delivering the power of 600kWe/657kWt, 1200kWe/1191kWt and 2000kWe/1990kWt.
Mining networks are subject to high requirements in terms of operational reliability and safety. The occurrence of ferroresonances in the network is one of the causes of instrument transformers being overloaded, which can cause their damage. Therefore, it is necessary to avoid this phenomenon and design the instrument transformers in a way so that even in the event of ferroresonance there is no damage...
Energy crisis around the world and implementation of so-called Package 3×20 where one of its demands aimed at increasing the share of renewable energy sources in overall balance, result in a significant increase in the interest in geothermal energy, and thus in the production of electricity from geothermal sources. Unfortunately, in Poland and the Czech Republic we are dealing mainly with low and...
In this paper, modeling of STATCOM for regulate the voltage in power flow calculation is proposed. Based on power flow, the proposed technique has been presented and tested on 26-bus power system. The results proved the correctness of the proposed technique. The influence of the STATCOM on regulating voltage and decreasing power losses has also been discussed in detail.
This work is focused on diversity analysis of daily load curves and outlier curve detection in distribution networks. For diversity evaluation unified load curves are defined and the Euclidean distance between them and the average curve is calculated. Outlier detection is based on the distance between a load curve and an average curve representing curves of the same day of the week as the analyzed...
This article discusses about the impact of new emission limits for nitrogen oxides (NOx) emissions which will be effective from 2021 for large combustion plants (LCP) in the Czech Republic and discusses about possible ways and techniques to achieve these strict emission limits.
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