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EN
Proper design of power installations with the participation of power cables buried in homogeneous and thermally well-conductive ground does not constitute a major problem. The situation changes when the ground is non-homogeneous and thermally low-conductive. In such a situation, a thermal backfill near the cables is commonly used. The optimization of thermal backfill parameters to achieve the highest possible current-carrying capacity is insufficiently described in the standards. Therefore, numerical calculations based on computational fluid dynamics could prove helpful for designers of power cable lines. This paper studies the influence of dimensions and thermal resistivity of the thermal backfill and thermal resistivity of the native soil on the current-carrying capacity of power cables buried in the ground. Numerical calculations were performed with ANSYS Fluent. As a result of the research, proposals were made on how to determine the current-carrying capacity depending on the dimensions and thermal properties of the backfill. A proprietary mathematical function is presented which makes it possible to calculate the cable current-carrying capacity correction factor when the backfill is used. The research is expected to fill the gap in the current state of knowledge included in the provisions of standards.
EN
In this paper, an analysis of electrical parameters of a 2036 m ESP three-phase power cable and round profile has been carried out. This analysis will provide subsidies to electrically model the channel through which the data will be transmitted from downhole to the surface. A printed circuit board was developed through the correct grouping of passive electronic components to represent the same impedance and phase behavior of the measured ESP power cable for a frequency range from 20 Hz to 200 kHz.
PL
W artykule nalizowany jest system komunikacji w zanurzeniowej pompie zasilanej napieciem trójfazowy za pośrednictwem kabla. Ten sam kabel jest też wykorzystywany do przesyłania sygnałów z czujników.
PL
Zgodnie z wymaganiami § 209 ust. 3, Rozporządzenia Ministra Infrastruktury z dnia 12 kwietnia 2002 roku w sprawie warunków technicznych, jakim powinny odpowiadać budynki i ich usytuowanie [tekst jednolity DzU z 2019 roku poz. 1065], pomieszczenie rozdzielni elektrycznej powinno stanowić osobną strefę pożarową. Korzystnie z punktu widzenia ochrony przeciwpożarowej jest lokalizować to pomieszczenie przy ścianie zewnętrznej budynku, o ile umożliwiają to uwarunkowania architektoniczne i przeznaczanie samego budynku. Niniejszy artykuł stanowi zastosowanie wiedzy teoretycznej dotyczącej metodyki projektowania PWP zamieszczonej na stronie 86.
4
Content available remote Fault location in the outer sheath of power cables
EN
With the development of power systems in recent years, the total amount of power cables in operation has increased greatly, and there are growing reports of cable failure. Cable failures may be due to various intrinsic or extrinsic factors and can lead to massive economic loss. With regard to high-voltage cables, such as 110 kV power cables, there are very few accurate reports on the actual fault observed. This article first analyses the possible causes of power cable outer sheath failure. It then introduces the bridge and step voltage methods, which are traditionally used for cable fault locating, and describes a new method for accurate fault locating in 110 kV cables, which uses the bridge method to pre-locate the fault and then the step voltage method to accurately determine the precise fault locating. Field testing confirms the applicability of the new method for accurate fault locating in 110 kV power cables. The results shown in this article may provide a good reference for the development of future research in related fields.
PL
Omówiono wymagania normy DIN4102 cz. 12 dotyczących kabli i ich systemu nośnego, stosowanych w systemach bezpieczeństwa.
EN
The paper discusses DIN4102, part 12 standard requirements for cables and their carrying systems applied in safety systems.
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