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1
Nowe możliwości testowania funkcji lokalizacji miejsca zwarcia na podstawie fali wędrującej (travelling wave)
Pritchard Christopher, Lampl Heinz, Hensler Thomas
Wiadomości Elektrotechniczne
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2020
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R. 88, nr 12
20--26
PL
Lokalizacja miejsca zwarcia na długich liniach przesyłowych na podstawie fal wędrujących (travelling waves) okazała się dokładną i niezawodną metodą. Zarówno zintegrowane z nowoczesnymi zabezpieczeniami linii, jak i specjalistyczne lokalizatory dostarczają użytecznych informacji dla operatorów, jak i pracowników technicznych. Testowanie oraz weryfikacja poprawnego działania tych urządzeń stanowi wyzwanie oraz najczęściej nie odbywa się podczas uruchomienia. O ile rozwiązania te są akceptowalne dla lokalizatorów miejsca zwarcia, zabezpieczenia nowych generacji będą używać informacji z fal wędrujących do określenia zwarcia i właściwego wyzwalania.
EN
Fault location using traveling waves has proven to be an accurate and reliable method for precise location of faults on long transmission lines. Both integrated into modern line protection relays and within separate fault location devices they provide useful information for operators and technicians. Testing and verification of correct operation of these devices is a challenging task and mostly not done during commissioning. While maybe acceptable for pure fault locators, new protection relay generations will use traveling waves to determine fault and trip accordingly.
2
Content available Active vibration suppression of axially moving string via distributed force
Łatas Waldemar
Vibrations in Physical Systems
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2020
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Vol. 31, nr 2
art. no. 2020215
EN
In the paper the problem of suppression of the waves - traveling along the linear, axially moving string - by the active distributed force is presented. The control law is based upon the idea of wave cancellation. The distributed force density is assumed to be proportional to the string transverse velocity resulting from the original running wave, assumed in the form of packet wave with amplitude modulation. As an objective function of the optimization problem considered the energy dissipated by the damping force segment is taken. Simulation results included demonstrate the effectiveness of the control law assumed and superiority of the distributed damping force over the concentrated force.
3
Content available remote A novel method to design an electro-kinetic platform based on complementary metal-oxide semiconductor technology using SKILL scripting of cadence
Abdelbaset Reda, Ghallab Yehya H., Ismail Yehea
Biocybernetics and Biomedical Engineering
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2019
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Vol. 39, no. 1
256--262
EN
The dielectrophoresis (DEP) is the motion of polarizable particles which is a result of the interaction between a non-uniform electric field and the induced dipole moment of these particles. The electro-kinetic DEP is a widely used technique for biological cells' manipulation, characterization and separation. The electro-kinetic DEP consists of three major configurations, they are; traveling wave dielectrophoresis (twDEP), electro-rotation dielectrophoresis (rotDEP), and levitation (levDEP). In this paper, a design of electrokinetic platform that includes the three electrokinetic configurations is presented and discussed. The design of the electrokinetic platform is implemented and simulated using 130 nm complementary metal-oxide-semiconductor (CMOS) technology. Also, this paper presents a developed technique to design the electrokinetic platform's electrodes. This developed technique is the usage of SKILL scripting of cadence (SSC) language. CMOS is a technology which is used to fabricate integrated circuits (IC). SKILL is a scripting language which supports the automation of a specific layout design by commands. The layout of electrokinetic DEP platform is developed using SSC. The performance of the developed electrokinetic platform using SSC versus the platforms based on the other traditional techniques is presented and evaluated using COMSOL Multiphysics®.
4
Content available Transient flow in gas networks: Traveling waves
Gugat M., Wintergerst D.
International Journal of Applied Mathematics and Computer Science
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2018
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Vol. 28, no. 2
341--348
EN
In the context of gas transportation, analytical solutions are helpful for the understanding of the underlying dynamics governed by a system of partial differential equations. We derive traveling wave solutions for the one-dimensional isothermal Euler equations, where an affine linear compressibility factor is used to describe the correlation between density and pressure. We show that, for this compressibility factor model, traveling wave solutions blow up in finite time. We then extend our analysis to networks under appropriate coupling conditions and derive compatibility conditions for the network nodes such that the traveling waves can travel through the nodes. Our result allows us to obtain an explicit solution for a certain optimal boundary control problem for the pipeline flow.
5
Content available remote Optimal Placement of Traveling Wave Fault Location Equipment in Power Grid Based on Characteristic Non-singular Set
Tang J., Yin X., Zhang Z., Qi X.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 5
30-35
EN
With the widely use of traveling wave fault location equipment (TWFLE) in power grid, network-based traveling wave fault location (NBTWFL) method has been proposed. To ensure the effectiveness and economy of NBTWFL method, based on the principle of characteristic nonsingular set, an optimal placement algorithm of TWFLE is proposed in this paper. The corresponding NBTWFL method based on maximum nonsingular subset, additional installation plan of TWFLE and some other related problems are also discussed in this paper.
PL
W artykule opisano metodą wykrywania awarii w sieci elektroenergetycznej na podstawie analizy fali wędrującej. Proponowane rozwiązanie bazuje na klasycznym algorytmie wykrywania fali wędrującej, w którym zastosowano niesingularne wartości własne. Pozwoliło to na optymalizację rozmieszczenia urządzeń do wykrywania awarii.
6
Content available remote Fault Location Techniques in Power System based on Traveling Wave using Wavelet Analysis and GPS Timing
Tabatabaei A., Mosavi M.R., Rahmati A.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 6
347-350
EN
In this paper two approaches are proposed based on Discrete Wavelet Transform (DWT) and traveling wave to locate the fault of the three phase transmission line. The exact fault position is determined according to the instances in time when the fault waves arrive at each locator location and wave speed calculated on the basis of the proposed algorithms. To achieve actual data, synchronized sampling is needed which can be made possible by precise time receivers based on Global Positioning System (GPS) time reference. All the possible fault types are generated using the ATP-EMTP and results using the two methods are discussed. Extensive simulation studies indicate that the proposed approaches are reliable for rapid and correct identification of various fault cases.
PL
Przedstawiono system do badania trójfazowej lini transmisyjnej. Metoda wykorzystuje falę wędrująca i dyskretną transformatę falkową oraz system GPS. Badania wykazały przydatność systemu do lokalizacji uszkodzeń sieci.
7
Content available remote A Traveling Wave Fault Location Method for Earth Faults Based on Mode Propagation Time Delays of Multi-measuring Points
Liu Y., Sheng G., Jiang X.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 3a
254-258
EN
A new traveling wave fault location method for earth faults is proposed based on propagation time delays between aerial mode and earth mode acquired by multi-measuring points on transmission line. Using phase-mode transformation theory and the theory of wavelet singularity detection to achieve the algorithm of propagation time difference detection. The JMarti model is used to build the system simulation model in the EMTP. The final results show that the method has high reliability and precision.
PL
Przedstawiono nową metodę wykrywania I lokalizacji błędu w linii transmisyjnej bazującą na analizie propagacji fali. Do tego celu wykorzystano transformatę falkową.
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