Author
Josef Herold
Bio: Josef Herold is an academic researcher from Karlsruhe Institute of Technology. The author has contributed to research in topics: Electromagnetic compatibility & Electromagnetic pulse. The author has an hindex of 1, co-authored 1 publications receiving 14 citations.
Papers
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TL;DR: In this article, an analysis of various avenues of conducted and radiated interference entry showing that cable braid and cabinet currents represent major sources of interference is presented. But, the authors do not consider the effect of interference propagation on the performance of interference countermeasures.
Abstract: High-impulse current and voltage measurement in high-voltage technology and plasma physics is generally accompanied by high-level electromagnetic interference. This paper gives an analysis of various avenues of conducted and radiated interference entry showing that cable braid and cabinet currents represent major source of interference. A better understanding of interference propagation leads to the systematic evaluation of counter measures which can be undertaken.
14 citations
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03 Jul 2013
54 citations
TL;DR: A measuring system based on a resistive divider using a copper sulfate (CuSO4 solution) has been developed and the experimental results show that it is capable of maintaining the output impulse of the Marx generator with rise time of 13 ns and amplitude of 170 kV.
Abstract: A measuring system based on a resistive divider using a copper sulfate (CuSO4 solution) has been developed to measure high-voltage impulses with rise times of several tens of nanoseconds. The response and temperature characteristics of the resistive divider have been studied. The divider has excellent response characteristics (<; 1-ns theoretical rise time) and good immunity from interference from a Marx generator and spark-gap switch. Stray parameters of the resistive divider are theoretically calculated, and their influences on the square-wave response are studied by Alternative Transients Program/ ElectroMagnetic Transient in DC System simulations. The measuring system is shielded using coaxial construction techniques. The experimental results show that it is capable of maintaining the output impulse of the Marx generator with rise time of 13 ns and amplitude of 170 kV.
20 citations
TL;DR: In this article, an equivalent circuit for the stray capacitances of resistive voltage dividers is proposed and the parameters of the equivalent circuit are determined from the electrostatic field of the divider.
Abstract: An equivalent circuit for the stray capacitances of resistive voltage dividers is proposed. The parameters of the equivalent circuit are determined from the electrostatic field of the divider. The stray-capacitance equivalent circuit for a 12.75-k? divider has been determined and its step-response has been computed. The computed stepresponse agrees well with the measured step-response.
13 citations
TL;DR: Several electrical and optical methods of measurement for the investigation of breakdown development in gases are described in this article, where both the temporal and the spatial discharge development can be investigated simultaneously, by this way both the spatial and the temporal discharge can be simultaneously investigated.
Abstract: Several electrical and optical methods of measurement for the investigation of breakdown development in gases are described. Thereby not the sensitivity but the temporal resolution is emphasized. For this reason especially the fast voltage collapse at the gap and the corresponding current rise can be investigated. This is even true in highly compressed gases. Furthermore, the exact synchronization of electrical and optical test methods is described. By this way both the temporal and the spatial discharge development can be investigated simultaneously.
9 citations
14 Aug 1995
TL;DR: In this paper, an analytical formulation for the transfer impedance of a hollow sphere, being an approximative model for a cubic shield, is presented, where the sphere is excited by direct current injection via thin conductors connected at opposite points on the sphere surface (poles).
Abstract: The merits of surface transfer impedance measurements of coaxial cables have stimulated efforts to find a similar procedure for shielded enclosures. This paper presents an analytical formulation for the transfer impedance of a hollow sphere, being an approximative model for a cubic shield. The sphere is excited by direct current injection (DCI) via thin conductors connected at opposite points on the sphere surface (poles).
4 citations