Temat: voltage transient - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: An Analysis of a Transformerless Dual Active Half-Bridge Converter
Autorzy:: Sosnowski, Robert
Chojowski, Maciej
Baszyński, Marcin
Tematy:: DC-DC converter
bidirectional converter
phase-shift control
zero voltage transient; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2175937.pdf Link otwiera się w nowym oknie
Opis:: This paper proposes a transformerless dual half-bridge converter (TLDAHB). By eliminating the transformer and harnessing the possibility of using a low inductor value, it is possible to minimise the size of the converter. A phase-shift pulse width modulation will result in a wide controlled voltage gain of the converter and operation as buck and boost. The theoretical topology analysis, simulation, and experimental results are presented. Theoretical analysis consists of analysis of power transfer and design. In case of experimental research, particular attention was paid to power transfer and efficiency analysis. Near zero switching transient of voltage in the half-bridge topology results with high efficiency.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Moshhnost potreblenija i fazovyjj sdvig mezhdu ehkranirovannogo preobrazovatelja nad provodjashhejj plastinojj
Power of consumption and phase displacement between voltage and a current of the covering ring capacitor transducer over a conducting plate
Autorzy:: Yatsun, A.
Tematy:: nondestructive testing
covering transducer
conducting plate
oscillation
voltage transient
Laplace transformation
power consumption
displacement; Pokaż więcej
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Powiązania:: https://bibliotekanauki.pl/articles/76918.pdf Link otwiera się w nowym oknie
Opis:: The sensitivities of power consumption and phase displacement between voltage and current in initial time of the covering ring capacitor transducerof rectangular crosssection above conducting plate as testing object to its permeance and electric conductivity after the primary measuring chain with a condenser is disconnect of source of permanent tension has been explored
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analiza możliwości detekcji wyładowań niezupełnych w aparaturze rozdzielczej średnich napięć w izolacji powietrznej metodą przejściowego napięcia doziemnego
Analysis and detection possibility of the partial discharges in air insulated medium voltage switchgear using transient earth voltage detection
Autorzy:: Buczko, R.
Sikora, A.
Tematy:: wyładowania niezupełne
aparatura rozdzielcza
przejściowe napięcie doziemne
partial discharges
switchgear
transient earth voltage; Pokaż więcej
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Powiązania:: https://bibliotekanauki.pl/articles/408523.pdf Link otwiera się w nowym oknie
Opis:: W nowoczesnej aparaturze rozdzielczej wykorzystuje się w coraz większym stopniu materiały polimerowe jako układy izolacyjne. Mimo swoich licznych zalet, wykazują one niekiedy ograniczoną wytrzymałość na wyładowania niezupełne. W artykule przedstawiono analizę możliwości wykorzystania nieinwazyjnej metody przejściowego napięcia doziemnego TEV do detekcji różnych form wyładowań niezupełnych w aparaturze rozdzielczej średnich napięć. Dzięki wykorzystaniu tej metody, diagnostyka odbywa się bez konieczności odstawiania urządzenia od systemu elektroenergetycznego. Uzyskane wyniki potwierdzają skuteczność metody.
Modern switchgear increasingly use polymeric materials as insulation. Despite its numerous advantages they have limited resistance to partial discharge corrosion in some cases. In this paper noninvasive methods Transient Erath Voltage (TEV) measurement is proposed to detect various forms of partial discharges in medium voltage switchgear. These method allows for non-invasive diagnostic without switch of the switchgear. Measurement results confirm the effectiveness of the proposed approach.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Transitional processes at capacitive currents switching-off by single and double-break interrupters of vacuum circuit breakers
Autorzy:: Lazimov, T.
Saafan, E.
Tematy:: vacuum circuit breaker
double-break vacuum interrupters
SF6 circuit breaker
capacitor banks
transient recovery voltage
dielectric strength
breaking capacity; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/410591.pdf Link otwiera się w nowym oknie
Opis:: Vacuum circuit breaker technology based on double-break vacuum interrupters has become the most requirements of high voltage circuit breakers that not environmentally harmful. The vacuum interrupter has an excellent ability to deal with the steep rising part of the transient recovery voltage, which makes it faster in the current interruption process. This paper presents results of computer simulations conditioned by capacitive currents switching-offs by using single and double interrupters of vacuum circuit breakers. These results demonstrate that use of double-break circuit breakers leads to notable decreasing of switching overvoltages and allows in the same time to meet the dielectric requirements for high voltage vacuum circuit breakers.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Influence of electromagnetic transient physical models considering characterization characteristics on capacitive voltage transformers
Autorzy:: Geng, Jie
Yang, Haiyong
Yi, Li
Zhang, Xiao
Wang, Yihang
Tematy:: broadband admittance parameters
capacitive voltage transformer
electromagnetic transient model
excitation deviation
saturation characteristics; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59112056.pdf Link otwiera się w nowym oknie
Opis:: The equivalent circuit of traditional capacitive voltage transformers often faces the problem of complex data calculation and difficulty in grasping the internal nonlinear characteristics of transformers when constructing broadband models, resulting in poor power accuracy and stability. Therefore, with the help of electromagnetic transient physical models, the admittance sub model and nonlinear model are established by considering the frequency and saturation characteristics of the transformer. Based on the characteristics of capacitive voltage transformers, the model is processed in parallel to obtain a broadband coupling transformer model. The results showed that the error between the simulated current peak amplitude and voltage results of the model and the measured values was less than 2% and 1%, respectively. In the fault results, the harmonic error of the load voltage of the improved transformer was relatively small, far less than the error result of 2.73% of the traditional transformer. The proposed transformer model can better characterize its characteristics and has good transient response ability, providing reference tools and value for the operation and state detection of power systems.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Multi-spark modeling of very fast transient overvoltages for the purposes of developing HV and UHV gas-insulated switchgear and of conducting insulation co-ordination studies
Autorzy:: Szewczyk, M.
Tematy:: very fast transient overvoltages
VFTO
gas insulated switchgear
GIS
disconnector switch
DS
modeling
simulations
transients
switching
mitigation
breakdown voltage
BDV
odłącznik
modelowanie
symulacje
transjenty
przełączanie
łagodzenie
rozdzielnice izolowane gazem; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200835.pdf Link otwiera się w nowym oknie
Opis:: Very fast transient overvoltages (VFTO) originate from steep voltage breakdowns in SF6 gas that are inherent to operation of any switching device of the gas-insulated switchgear (GIS) type. For power stations with voltage ratings exceeding 500 kV, the ratio between equipment rated- and withstand-voltage levels becomes relatively low, which causes the VFTO peak values to reach the component’s insulation withstand-voltage levels, thus becoming a design factor for high- and ultra-high voltage GIS. While well-established approach to VFTO analyses involves only single VFTO events (the so-called single-spark approach), there is often the need to analyze the entire VFTO generation process, for which the multi-spark approach to VFTO modeling is to be employed. The multi-spark approach allows one to evaluate the VFTO impact on the GIS disconnector design along with the impact of the VFTO on selection and dimensioning of the VFTO damping solutions. As the multi-spark approach to VFTO modeling is now being increasingly used in UHV GIS developments as well as for the insulation co-ordination studies of power stations, the present paper is motivated by the need to report on the VFTO multi-spark modeling approach and to lay a common ground for development works that are supported extensively with VFTO simulations. The paper presents physical assumptions and modeling concepts that are in use in such modeling works. Development of the multi-spark GIS disconnector model for VFTO simulations is presented, followed by an overview of examples of the model application for the GIS development works and for insulation co-ordination studies.
Dostawca treści:: Biblioteka Nauki

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