TY - CHAP A1 - Küchler, Andreas A1 - Hammer, F. T1 - Insulating Systems for HVDC Power Apparatus T2 - 3rd Int. Conf. on Properties Y1 - 1995 CY - Graz, Österreich ER - TY - CHAP A1 - Küchler, Andreas A1 - Hammer, F. T1 - Application of Dielectric Materials Y1 - 1991 SP - 965 EP - 968 CY - Tokyo ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Taubert, Dieter Richard A1 - Monte, C. A1 - Gutschwager, B. A1 - Baltruschat, C. A1 - Hollandt, Jörg A1 - Kochems, D. A1 - Küchel, C. T1 - The Spectral Photon Flux of the Radiometric Calibration Spectral Source for the NIRSpec Instrument of the James Webb Space Telescope JF - Metrologia Y1 - 2009 UR - http://permalink.bibkatalog.de/BV012573233 IS - 46 SP - 207 EP - 212 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Thomas, R. A1 - Hill, K.D. A1 - Steele, A.G. A1 - Ma, C.K. T1 - Bilateral comparison of the NRC and PTB local realizations of the ITS-90 between the silver point and 1700 °C using vacuum tungsten strip lamps as transfer standards JF - Metrologia Y1 - 2006 UR - http://permalink.bibkatalog.de/BV012573233 VL - 43 IS - 03003 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Friedrich, R. A1 - Taubert, Dieter Richard A1 - Hollandt, Jörg T1 - Improved calibration of the spectral responsivity of interference filter radiometers in the visible and near infrared spectral range at PTB JF - Metrologia Y1 - 2003 UR - http://permalink.bibkatalog.de/BV012573233 IS - 40 SP - 35 EP - 38 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Anhalt, Klaus A1 - Zelenjuk, A. A1 - Taubert, Dieter Richard T1 - New PTB Set-up for the absolute calibration of the spectral responsivity of radiation thermometers JF - International Journal of Thermophysics Y1 - 2009 UR - http://permalink.bibkatalog.de/BV013298193 IS - 30 SP - 192 EP - 202 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Ma, C.K. A1 - Gibson, C. T1 - Decreasing dependence of the calibration of the tungsten strip lamp on the temperature of the lamp base with increasing filament length JF - Metrologia Y1 - 2005 UR - http://permalink.bibkatalog.de/BV012573233 IS - 42 SP - 383 EP - 388 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Anhalt, Klaus A1 - Wang, Y. A1 - Yamada, Y. T1 - Large and small aperture Fixed-point cells of Cu, Pt-C, and Re-C JF - International Journal of Thermophysics Y1 - 2008 UR - http://permalink.bibkatalog.de/BV013298193 IS - 29 SP - 969 EP - 983 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Werner, L. T1 - Radiation thermometry towards the triple point of water? JF - International Journal of Thermophysics Y1 - 2008 UR - http://permalink.bibkatalog.de/BV013298193 IS - 29 SP - 1052 EP - 1065 ER - TY - JOUR A1 - Hartmann, Jürgen T1 - Correct consideration of the index of refraction using blackbody radiation JF - Optics Express Y1 - 2006 UR - http://permalink.bibkatalog.de/BV013253264 VL - 14 IS - 18 SP - 8121 EP - 8126 ER - TY - JOUR A1 - Hartmann, Jürgen T1 - Advanced comparator method for measuring ultra small aperture areas JF - Meas.Sci.Techn. Y1 - 2001 IS - 12 SP - 1678 EP - 1682 ER - TY - CHAP A1 - Wirth, Isabell A1 - Reumann, Andreas A1 - Küchler, Andreas A1 - Schnitzler, Tim A1 - Langens, Achim A1 - Berger, Frank A1 - Zink, Markus H. T1 - Steady-state and Transient Electrical Potential Distribution in HVDC Bushings Measured under Different Thermal Conditions T2 - 19th International Symposium on High Voltage Engineering Y1 - 2015 CY - Pilsen, Czech Republic ER - TY - BOOK A1 - Zink, Markus H. T1 - Zustandsbewertung betriebsgealterter Hochspannungstransformatordurchführungen mit Öl-Papier-Dielektrikum mittels dielektrischer Diagnose BT - Dissertation Technische Universität Ilmenau Y1 - 2013 UR - http://permalink.bibkatalog.de/BV041616215 PB - Universitätsverlag Ilmenau CY - Ilmenau ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Lowe, D. A1 - Anhalt, Klaus T1 - Construction and validation of a platinum-carbon eutectic fixed-point JF - Metrologia Y1 - 2008 UR - http://permalink.bibkatalog.de/BV012573233 IS - 45 SP - 325 EP - 329 ER - TY - JOUR A1 - Zink, Markus H. A1 - Küchler, Andreas A1 - Berger, Frank T1 - Kompensation des Temperatureinflusses auf dielektrische Messungen im Zeitbereich zur Beschreibung von Isolierwerkstoffen JF - ETG-Fachtagung „Grenzflächen in elektrischen Isoliersystemen“ Y1 - 2013 CY - Dresden ER - TY - BOOK A1 - Zink, Markus H. T1 - Kerntechnik Y1 - 2011 UR - http://permalink.bibkatalog.de/BV039571799 PB - Vogel Fachbuchverlag ER - TY - BOOK A1 - Zink, Markus H. T1 - Kerntechnik Y1 - 2009 UR - http://permalink.bibkatalog.de/BV023748515 PB - Vogel Fachbuchverlag ER - TY - CHAP A1 - Wirth, Isabell A1 - Sturm, Sebastian A1 - Küchler, Andreas A1 - Zink, Markus H. A1 - Berger, Frank A1 - Schnitzler, Tim T1 - Berücksichtigung von Leitungs- und Polarisationsmechanismen in transienten FEM-Simulationen von HGÜ-Isoliersystemen T2 - VDE-Hochspannungstechnik 2018, Berlin N2 - The calculation of electrical field distributions in insulation systems for high voltage direct current (HVDC) transmission using the finite element method (FEM) usually only considers the dielectric properties in the form of permittivities and conductivities. Due to not sufficiently well simulated transient processes, state of the art is considering the polarization processes by equivalent network models. The application and implementation of polarization mechanisms in a FEM soft- ware closes this gap and allows calculating the electric field distribution more precisely. An implementation of additional differential equations, according to the RC-network model, describing the field dependent polarization mechanisms, are complementing the displacement and conduction current. Material equations and their parameters are determined by measuring the polarization and depolarization currents (PDC). These equations are necessary for both the RC-network models and the differential equations for the FEM. They can be adapted to the actual temperatures in the insulation system. Hence, the necessarily multidimensional electric field calculations of complex insulation systems with stationary or transient temperature-gradients are possible. The described calculation method is verified by reactionless fieldmill voltmeter measurements of transient voltage profiles at the grading foils of modified high voltage DC-bushings. A better accuracy is achieved for the simulation of transient and stationary potential distributions. N2 - Bei der Berechnung elektrischer Feldverteilungen in Isoliersystemen für die Hochspannungsgleichstromübertragung (HGÜ) mit Hilfe der Finiten Elemente Methode (FEM) werden die dielektrischen Eigenschaften bisher meist in Form von Permittivitäten und Leitfähigkeiten berücksichtigt. Da die transienten Verläufe nicht ausreichend genau abgebildet werden, ist Stand der Technik die Polarisationsvorgänge exakter durch Netzwerkmodelle nachzubilden. Durch Implementierung von Polarisationsmechanismen in einem FEM-Programm wurde diese Lücke geschlossen und es können nun elektrische Feldverteilungen vor allem im transienten Zustand wesentlich präziser berechnet werden. In Analogie zum RC-Netzwerkmodell werden hierfür zusätzlich zu den Gleichungen, die die feldabhängigen Verschiebungs- und Leitungsströme beschreiben, weitere Differentialgleichungen eingesetzt, welche die ebenfalls feldabhängigen Polarisationsströme abbilden. Die Materialfunktionen und ihre Parameter werden durch Messung von Polarisations- und Depolarisationsströmen (PDC) ermittelt. Diese Gleichungen werden sowohl für die RC-Netzwerkmodelle als auch für die Aufstellung der Differentialgleichungen für die FEM benötigt. Sie können unmittelbar auf die am jeweiligen Ort im Isoliersystem herrschende Temperatur umgerechnet werden. Somit sind transiente elektrische Feldberechnungen auch für komplexe Isoliersysteme möglich, die sich nur durch mehrdimensionale FEM-Modelle abbilden lassen und in denen oftmals stationäre oder transiente Temperaturgradienten vorliegen. Das beschriebene Berechnungsverfahren wird durch die rückwirkungsfreie Messung transienter Potentialverläufe an den Steuerbelägen von entsprechend modifizierten kondensatorgesteuerten Hochspannungsdurchführungen verifiziert. Dabei kann eine höhere Übereinstimmung der transienten und stationären Potentialverläufe zwischen Simulation und Messung erzielt werden. Y1 - 2018 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=8576769 ER - TY - CHAP A1 - Koch, Myriam A1 - Hohloch, Jens A1 - Wirth, Isabell A1 - Sturm, Sebastian A1 - Zink, Markus H. A1 - Küchler, Andreas T1 - Experimental and simulative analysis of the thermal behavior of high voltage cable joints T2 - VDE-Hochspannungstechnik 2018, Berlin N2 - Nowadays, cable systems are often preferred when deciding on the type of new transmission lines even in the high and extra high voltage range. One of the main reasons is the better public acceptance. In addition, the power to be transmitted in the grid is increasing leading to increased ohmic losses and thus, to higher thermal stress on the materials. The investigations in this contribution focus on cable joints, which represent important and decisive components of cable systems. In order to optimize the design and to ensure reliable operation over the entire service life, the temperature profile within these components is of special interest. For their detailed investigation, a test circuit was set up consisting of a cable section and sections with build-up stages of a cable joint. A large number of measuring points were defined also at points where no measurement is possible in normal operation. With a thermographic camera the surface temperature distributions were observed. With the laboratory setup temperature profiles under various load conditions were recorded. A detailed FEM model was built and verified with help of these measurements. The model permits the investigation of specific questions of cable systems such as the comparison of temperature loads resulting from normal operating conditions and of test procedures according to the relevant standards. Besides others the effect of stressing the insulation and sealing system by heating the inner conductor vs. heating from outside by surrounding water is discussed. Y1 - 2018 UR - https://ieeexplore.ieee.org/document/8576752 ER - TY - CHAP A1 - Wirth, Isabell A1 - Reumann, Andreas A1 - Küchler, Andreas A1 - Zink, Markus H. A1 - Berger, Frank A1 - Langens, Achim A1 - Schnitzler, Tim A1 - Heil, B. T1 - Measurement and simulation of transient field stresses and impacts on advanced insulation design and new test procedures for HVDC components T2 - Cigre-Konferenz, Paris Y1 - 2020 ER -