Temat: transformers - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On parameters determination of multi-port equivalent scheme for multi-winding traction transformers
Autorzy:: Sobczyk, T. J.
El Hayek, J.
Powiązania:: https://bibliotekanauki.pl/articles/950657.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: multi-winding transformer
equivalent scheme
multi-port circuit
traction transformers
Opis:: This paper aims to present a new equivalent scheme of multi-windings traction transformers, based on multiport purely inductive circuit. The mathematical background of this equivalent scheme is described. The determination of the different scheme elements is made through a finite-elements calculation of both main and leakage inductances, for the case of a four-winding transformer. A procedure is defined, which allows to estimate the values of these elements from some measurements on the transformer at no-load and short-circuit operations. A specific strategy of short-circuit tests is described, allowing to determine all parameters in a rather simple way.
Źródło:: Archives of Electrical Engineering; 2015, 64, 1; 17-27
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Improving sensitivity of residual current transformers to high frequency earth fault currents
Autorzy:: Czapp, S.
Dobrzyński, K.
Klucznik, J.
Lubosny, Z.
Kowalak, R.
Powiązania:: https://bibliotekanauki.pl/articles/141169.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: current transformers
earth fault currents
electric devices
electromagnetic couplings
high frequency
Opis:: For protection against electric shock in low voltage systems residual current devices are commonly used. However, their proper operation can be interfered when high frequency earth fault current occurs. Serious hazard of electrocution exists then. In order to detect such a current, it is necessary to modify parameters of residual current devices, especially the operating point of their current transformer. The authors proposed the modification in the structure of residual current devices. This modification improves sensitivity of residual current devices when high frequency earth fault current occurs. The test of the modified residual current device proved that the authors’ proposition is appropriate.
Źródło:: Archives of Electrical Engineering; 2017, 66, 3; 485-494
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Investigation of GIC effects on core losses in single phase power transformers
Autorzy:: Mousavi, S.A.
Engdahl, G.
Agheb, E.
Powiązania:: https://bibliotekanauki.pl/articles/141321.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: transformator energetyczny
prądy indukowane geomagnetycznie
histereza
power transformers
geomagnetically induced currents
hysteresis
Opis:: This paper presents a method for estimation of core losses in banks of single phase power transformers that are subjected to an injected DC current such as geomagnetically induced currents (GIC). The main procedure of the core loss calculation is to obtain a magnetic flux density waveform in both time and location by using a novel algorithm based on 3D FEM inside the core and then to calculate the loss distribution based on loss separation theory. Also, a simple and effective method is proposed for estimation of losses of asymmetric minor loops by using combination of symmetric loops. The effect of DC biasing on core losses in single phase power transformers is investigated and the sensitivity of core type and material is evaluated. the results shows that DC current biasing could increase core losses up to 40 percent or even more.
Źródło:: Archives of Electrical Engineering; 2011, 60, 1; 35-47
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Ambient temperature as the reason for MV/LV power transformer damage
Autorzy:: Chojnacki, Andrzej Łukasz
Powiązania:: https://bibliotekanauki.pl/articles/1955206.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: damage
distribution grids
reliability
temperature
transformers
szkody
sieci dystrybucyjne
niezawodność
temperatura
transformatory
Opis:: The paper presents an evaluation of MV/LV power transformer damage risk due to the impact of ambient temperature at their operation location. It features a presentation of the method of evaluating the power structures’ reliability in the conditions of the structures’ variable durability and exposure values. Based on perennial observations of ambient temperature and failure rate of MV/LV transformers, it was demonstrated that temperature is a factor that causes damage or is jointly responsible for the damage caused in all of the devices’ other failures.
Źródło:: Archives of Electrical Engineering; 2021, 70, 4; 979-990
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

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