May 2025, Issue 5 (851)

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TABLE OF CONTENTS

 

POWER ENGINEERING AND PRODUCTION COMPANIES

Piotr Farbiszewski, Wojciech Majka, Jakub Chłodek, Wojciech Jewuła
Miscibility of wind turbine gear oils

 

Marcin Gronowski
Water and construction legal aspects of floatingvoltaics (FPV) investments in Poland

Zbigniew Krysiak
The potential of HTGR nuclear reactors in increasing the economic efficiency of investments in the energy sector

Mariusz Szot, Przemysław Kędzierski
Increasing the intrinsically safe power of remote power supplies using alternating current at frequencies in the acoustic range

Tadeusz Glinka, Paweł Warczyński
Problems of assessing the technical condition of transformers in operation

Michał Izdebski
Testing of the shaft voltage measurement system and the insulation of generator bearings and seals

 

POWER ENGINEERING AND INTERESTING BOOKS

Bogumił Dudek
Nuclear power plant – for the electrical industry

 

POLISH POWER ENGINEERS

Bogumił Dudek
Henryk Gładyś (1936-2025)

 

OVERTIME LECTURE…

Bogumił Dudek
Quantechism 2.0

 

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SUMMARIES

 

Piotr Farbiszewski, Wojciech Majka, Jakub Chłodek, Wojciech Jewuła
Miscibility of wind turbine gear oils
Lubricant miscibility, especially when changing product types or when top-ups are required, is a significant operational challenge. Although manufacturers often declare full compatibility in their technical data sheets, reality shows that their compatibility is also crucial. The Ecol Oil Analysis Laboratory conducted miscibility and compatibility tests on eight fresh wind turbine gear oils. The results indicate that additive incompatibility can lead to problems such as excessive foaming or the risk of deposits, even with seemingly similar products. This article discusses the essence of the research, conclusions and recommendations for safe oil mixing, emphasizing the importance of prevention and thorough preparation of systems before changing lubricants.

 

Marcin Gronowski
Water and construction legal aspects of floatingvoltaics (FPV) investments in Poland
The article presents the issue of the applicability of floatovoltaics installations under Polish legal conditions. Taking into account the policies of the European Union and individual countries limiting the use of agricultural land for non-agricultural and climate purposes, FPV is presented as one of the necessary innovations for their implementation. The thesis of this paper is that in order to fully exploit the potential of FPV and make climate policies a reality, EU-wide harmonisation and changes to Polish legislation are required. The text provides a basic technical explanation and environmental data from the first experiments before moving on to an analysis of Polish water, construction, spatial and environmental law. The study concludes by presenting a proposal for changes to the current law in Poland. In the course of the study, dogmatic-legal, theoretical-legal and functional methods were used. 

 

Zbigniew Krysiak
The potential of HTGR nuclear reactors in increasing the economic efficiency of investments in the energy sector
This paper presents different approaches to assessing the efficiency of nuclear investments in SMR reactors, including HTGR, in-particular. Nuclear reactors have an advantage in terms of offering lower energy prices than those from photovoltaic sources or wind farms. Moreover, unlike photovoltaic and wind farms, nuclear power plants are a stable source of energy, which reduces the risk of economic system failure. The presented studies have shown that HTR reactors are characterized by the lowest LCOE values, providing lower energy production costs, and the NPV of such projects is in some cases added, unlike other types of SMRs. These facts indicate a high prospective potential of the Polish POLA-HTGR reactor. The study has shown that the variance of estimated SMR investment costs is very high, which creates a challenge for searching for more accurate modeling of SMR production costs, which can be supported by the production cost theory, in which increasing the scale of SMR production as-a-result of the learning curve will allow for more precise cost estimation. The paper also presents how the modernization of existing conventional power plants using HTR reactors reduces the costs of energy production and thus the prices for energy consumers. 

 

Mariusz Szot, Przemysław Kędzierski
Increasing the intrinsically safe power of remote power supplies using alternating current at frequencies in the acoustic range
This article discusses the relevant question of power supplies of electrical devices in explosion hazard zones. The requirements as to ATEX directive have been brought. It mentions another significant issue, which is electric shock risk. The main purpose of the research mentioned in this article is to indicate the possibility of remote transmission of intrinsically safe, increased, power supply energy using alternating current at frequencies in the acoustic range in relation to direct current power supply. The above mentioned energy is meant to be transferred via wire way.

 

Tadeusz Glinka, Paweł Warczyński
Problems of assessing the technical condition of transformers in operation
Problems of assessing the technical condition of transformers in operation. include: on-line and off-line research methodology, reliability of results and comparative criteria. A four-level scale for assessing the technical condition of power transformers was proposed: normal, warning, alarm and emergency. The classification of the technical condition assessment is an indicator for further actions. An effective and failure-free on-line diagnostic system was presented, which has already been applied to several dozen transformers in the domestic power industry. The usefulness and benefits of its use were confirmed. It was proposed to organize a National Center for Supporting the Development of Energy. 

 

Michał Izdebski
Testing of the shaft voltage measurement system and the insulation of generator bearings and seals
This paper presents main sources of the shaft voltage in the turbo generators. The build-up of voltage on the shaft may damage bearings with consequent malfunction of the machine. One method to minimize the impact of the shaft voltages is the insulation of generator bearings. The paper describes how to check quality of this insulation using the shaft voltage and bearing insulation measurement system designed, implemented and tested in the power plant by the Institute of Power Engineering – National Research Institute, Gdansk Division.