A method for measuring transients caused by interrupting current using a transmission line terminated in its characteristics impedance

Minegishi, Shigeki; Echigo, Hiroshi; Sato, Risaburô

doi:10.1109/15.305464

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…This is an improvement system of Ref. (12), that is, the characteristic impedance of the cables and N-type coaxial switch is 50Ω, and the resistors were designed to match the characteristic impedance of the cables, therefore R 1 and R 2 are also 50Ω. The length of cable#1 is 50 m to prevent current transients reflected a little in R 1 , which is not a pure resistance at high frequencies, from almost influencing the waveform.…”

Section: Transmission Line Experimental Systemmentioning

confidence: 99%

Transition Duration at Arc Occurrence and Termination caused by Interrupting Low Current in Air at Atmospheric Pressure

Minegishi

Kawamata

2016

IEEJ Trans. FM

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A transition duration at the steady arc occurrence and termination caused by interrupting a current is measured. In consideration of the fast transients and high frequency discharge phenomena due to interrupting the current, a transmission line system was introduced. It consists of a coaxial switch, coaxial cables as transmission lines on the right and left sides of the switch, and termination resistors. The material of the inner conductor of the coaxial switch for interruption of the current is silver and copper. The resistors were designed to match the characteristic impedance of the cables. A semi-rigid cable as a coaxial cable and a coaxial attenuator (DC ~8.5 GHz) as the termination resistor were used on the right side of the switch for measurement of transition duration. When the current is interrupted by the switch, the transient waveform of output of the attenuator is measured by an oscilloscope (DC ~4.5 GHz). Regardless of the materials of the center conductor of the switch, the transition duration at the arc occurrence and termination caused by interrupting low current (0.5-1.0 A) is 0.2 ~0.4 ns and 1.28 ~2.08 ns, respectively, and does not depend on the material of the inner conductor of the switch and current value. The transition duration at the arc occurrence is very rapid.

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Section: Transmission Line Experimental Systemmentioning

confidence: 99%

Transition Duration at Arc Occurrence and Termination caused by Interrupting Low Current in Air at Atmospheric Pressure

Minegishi

Kawamata

2016

IEEJ Trans. FM

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“…12, enquanto que os terminais emissores das fases 2 e 3 foram mantidos aterrados. Considerou-se que a linha está conectada a uma carga idêntica à impedância característica Z c da linha de modo a evitar que ocorram reflexões de correntes e tensões nos terminais da linha [10].…”

Section: B Comparaçõesunclassified

Alternative proposal for Modal Representation of a Non-transposed Three-Phase Transmission Line with a Vertical Symmetry Plane

Kurokawa

Prado

Pissolato³

et al. 2009

IEEE Latin Am. Trans.

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The objective of this paper is to show an alternative representation in time domain of a non-transposed three-phase transmission line decomposed in its exact modes by using two transformation matrices. The first matrix is Clarke's matrix that is real, frequency independent, easily represented in computational transient programs (EMTP) and separates the line into quasi-modes a, b and zero. After that, Quasi-modes a and zero are decomposed into their exact modes by using a modal transformation matrix whose elements can be synthesized in time domain through standard curve-fitting techniques. The main advantage of this alternative representation is to reduce the processing time because a frequency dependent modal transformation matrix of a three-phase line has nine elements to be represented in time domain while a modal transformation matrix of a two-phase line has only four elements. This paper shows modal decomposition process and eigenvectors of a nontransposed three-phase line with a vertical symmetry plane whose nominal voltage is 440 kV and line length is 500 km.

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Electromagnetic interference detection using wavelet transform

Hung

Chi²

2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294)

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A method for measuring transients caused by interrupting current using a transmission line terminated in its characteristics impedance

Cited by 5 publications

References 10 publications

Transition Duration at Arc Occurrence and Termination caused by Interrupting Low Current in Air at Atmospheric Pressure

Transition Duration at Arc Occurrence and Termination caused by Interrupting Low Current in Air at Atmospheric Pressure

Alternative proposal for Modal Representation of a Non-transposed Three-Phase Transmission Line with a Vertical Symmetry Plane

Electromagnetic interference detection using wavelet transform

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