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In the last century people started to prefer using long-term sustainable alternative energy sources because of environmental impact of the vast primer energy consumption increase. This paper's investigations based on a Hungarian wind park's predicted and measured power datasets from February to September. Firstly, it is needed to turn out the applied measured and predicted wind values from available...
In this paper the slow polarization processes were investigated on 1 mm thick PVC samples. The specimens contained four different mass fraction of di-octyl phthalate (DOP) plasticizer. This polymer type is a widely used cable insulating material in the electrical industry e.g. low voltage distribution cables, cables in nuclear power plants etc. By means of a Megger IDAX 300 device, dissipation factor...
Electrical insulation system is one of the most important part of the electrical equipment. However, also the weakest link in the chain of the reliability of the whole device. The main aim of this paper is to describe different kinds of defects of electrical insulation and their impact on the field distribution and on other parameters. It may lead to local overloading of insulation and to shortening...
This paper describes a conventional power plant model, which consists of synchronous generator connected to the model of 22 kV distribution grid. This paper is mainly focused on a synchronization device. It is the most important part of the whole model. It is responsible for measuring, evaluation of the measured values and the connection itself. Measured parameters are voltage, frequency of generator...
Since the early 1970s, the accidental damage of small bore piping has been frequently reported. When an accident occurs, an immediate response is not currently possible, because maintenance and repairing technology are not institutionalized in KOREA. Purpose of this research is to develop an online repairing technology for socket welded in a nuclear power plant using development technology by KOREA...
Remarkable percentage of the currently operating medium voltage cable lines are still paper insulated lead covered (PILC) cables reaching or exceeding their lifetime expectancies. The old cables are replaced completely or partly to cross-linked polyethylene (XLPE) cables producing mixed PILC and XLPE insulated cable lines. By means of the Voltage Response Method the decay and return voltages are measured...
Composite insulation systems are an inseparable part of high voltage equipment. The strongly inhomogeneous structure of these materials is the main problem which may lead to defect during its operation. The main aim of this paper is to describe new composite insulation material with the polymer matrix, magnesium oxid filler and polyethylene naphthalate carrier. Dielectric properties like dissipation...
Ester dielectric liquids were found to overcome mineral oils in terms of flash point and environmental aspects. We study Ester oils behavior through partial discharge inception voltage (PDIV) and compare it with mineral oil. We conduct experiments on two types of oil, ester oil (fatty acid ester made from vegetable oil) and mineral oil so that the comparison can be made. We use the Needle-To-Plane...
This paper describes the effects of constant and varied maintenance strategies through an example of artificially generated failure data. During the constant maintenance strategy two main cases are distinguished. In the first example constant number of failures while in the second example specified percentage of failures are prevented with maintenance every year. Through the case study of the varied...
This paper presents the issue of the control units used for tuning of Petersen coil. Utilization of specific algorithm is given by certain application assumptions. Generally, it is possible to say that all algorithms can contribute to reducing of the fault current size. The size of the fault current is different depending on the adverse effects and the algorithm used. This also influences the time...
This paper describes the development of an advanced locomotive simulator for educational purposes. First, an overview of currently existing locomotive simulators is made. Next, requirements for the simulator are specified with the aim of significantly improving the reality of the simulation itself. Based on these requirements a modular system is developed. This system allows the use of common modules...
One of the most important realities and uncertainties in the deregulated electricity market is electricity demand. Electricity demand scenario generation in day-ahead markets using newly proposed Enhanced path-based scenario generation method based on autoregressive moving average is developed in this paper. A new enhanced path-based scenario generation method to generate scenarios of the random variable...
Public lighting system represents a major factor for safe transportation in populated areas. With continuing quest for cost reduction in public lighting, many municipalities aim to rebuild their systems usually with newer and more efficient technologies such as LED. Public lighting systems are usually connected to low voltage power grid and grid arrangement dictates possible designs of lighting system...
Gas-cooled Fast Reactor (GFR) is one of the generation IV reactor concepts. The fast neutron spectrum and high outlet temperature of the core make this reactor type a contributor to the sustainability of the nuclear technology. One of the main challenges of the concept is the development of new fuel assembly types, which can withstand the high temperature [1][2]. Because of the high temperature, the...
The increasing atmospheric carbon-dioxide level and the increasing energy need for transportation are being considered as more and more serious problems nowadays. Some people think of electric vehicles as a solution; this would decrease the air pollution in cities as well. Another endeavour to reduce the carbon dioxide emission coming from transportation is the utilisation of biofuels in vehicles...
Nowadays one of the most important social issues is to decrease the energy consumption and the environmental load of the transport sector. Although the efforts of the past decades resulted in considerable changes, the topic of the sustainable mobility comes into prominence in Hungary now. The aim of my paper is to examine the spread of the electric powered vehicles in Hungary. With the purpose of...
VVER-1200 NPP (Nuclear Power Plant) is a 3+ generation Russian designed PWR (Pressurized Water Reactor). This type of NPPs will be built to increase the capacity of Paks NPP. In our paper the impact of the mixing vane of VVER-1200 spacers on the flow is examined. Distribution of velocity, temperature field and cross-flows are evaluated. For these investigations detailed calculation models have been...
Despite its technological superiority, there is a strong commitment to reduce the application of sulfur-hexafluoride due to its exceptionally high global warming potential. Its application was banned from all industries except the electric power industry, where no alternative with equivalent properties has been found. However, there are applications where it is possible to reduce its application....
High pressure methane is one of the most important novel fuel (CNG - Compressed Natural Gas, almost pure methane stored on 20–25 MPa). Additionally - just like other low alkanes - it might be used as working fluid for various thermodynamic cycles. On ambient temperature, methane is already in supercritical states under these pressures. For supercritical fluids, there are several anomalous properties;...
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