TY - CHAP A1 - Küchler, Andreas A1 - Reumann, Andreas A1 - Zink, M. A1 - Voll, S. A1 - Berger, Frank A1 - Langens, Achim A1 - Titze, J. T1 - Der Einfluss von Temperatur, Feldstärke und Atmosphäre auf die Alterung von OIP Hochspannungstransformatordurchführungen BT - ETG-Fachtagung „Diagnostik elektrischer Betriebsmittel“ T2 - ETG-Fachbericht 134 Y1 - 2012 PB - VDE CY - Fulda ER - TY - CHAP A1 - Küchler, Andreas A1 - Zink, M. A1 - Voll, S. A1 - Berger, Frank A1 - Klipfel, V. T1 - Der Einfluss von Temperatur und Streukapazität auf diagnostische Kapazitäts- und Verlustfaktormessungen von 400 kV-Hochspannungstransformatordurchführungen BT - ETG-Fachtagung „Diagnostik elektrischer Betriebsmittel“ T2 - ETG-Fachbericht 134 Y1 - 2012 PB - VDE CY - Fulda ER - TY - CHAP A1 - Küchler, Andreas A1 - Zink, M. A1 - Berger, Frank A1 - Klipfel, V. T1 - Electrical Simulation as a Tool for Ageing-condition Assessment of Generator Transformer Bushings T2 - 2012 IEEE International Conference on Condition Monitoring and Diagnosis CMD Y1 - 2012 SP - 23 EP - 27 CY - Bali, Indonesia ER - TY - CHAP A1 - Küchler, Andreas A1 - Schober, F. A1 - Krieg, A. A1 - Liebschner, M. A1 - Berger, Frank T1 - Parameter influences on HVDC transformer insulation and its link to conduction processes T2 - 32nd International Conference “Science in Practice” Y1 - 2014 CY - Osijek, Croatia ER - TY - CHAP A1 - Sturm, Sebastian A1 - Wirth, Isabell A1 - Paulus, Johannes A1 - Zink, Markus H. A1 - Küchler, Andreas A1 - Berger, Frank T1 - Transient dielectric simulation in time domain with FEM in comparison with circuit models T2 - XIX International Symposium on Theoretical Electrical Engineering, Ilmenau, 2017 Y1 - 2017 ER - TY - CHAP A1 - Zink, Markus H. A1 - Berger, Frank A1 - Klipfel, V. A1 - Küchler, Andreas T1 - Ageing Condition Assessment of 400 kV OIP Generator Transformer Bushings T2 - 17th ISH International Symposium on High Voltage Engineering Y1 - 2011 CY - Hannover ER - TY - CHAP A1 - Küchler, Andreas A1 - Schober, F. A1 - Exner, W. A1 - Krause, Ch. A1 - Liebschner, M. A1 - Berger, Frank T1 - Interaction of Pressboard with Impregnating Fluids in HVDC Insulation Systems T2 - IEEE Electrical Insulation Conference Y1 - 2014 SP - 276 EP - 280 CY - Philadelphia, Pennsylvania, USA ER - TY - CHAP A1 - Küchler, Andreas A1 - Wirth, Isabell A1 - Reumann, Andreas A1 - Zink, Markus H. A1 - Schnitzler, Tim A1 - Langens, Achim A1 - Berger, Frank T1 - Steady-state and Transient Electrical Potential Distributions in HVDC Bushings Measured under Different Thermal Conditions T2 - 19th International Symposium on High Voltage Engineering N2 - High voltage DC (HVDC) applications become more and more important and the voltage level for energy transportation increases steadily. Hence the design of the DC insulation systems becomes more and more difficult. The difference between HVDC and HVAC insulation systems is that in HVAC the electrical field is distributed according to the permittivities of the materials. Permittivity is only weakly dependent on temperature, so there is no significant difference between the electrical field distribution at room temperature and operating temperature of the insulation system. In HVDC however the electrical field is distributed according to the conductivities of the insulation materials whereas the conductivity is strongly dependent on temperature. This can lead to completely different field distributions at varying temperatures. The investigations presented here show simulation results of HVDC bushing cores in comparison with measurements on those test objects. Simulations and measurements were performed both for temperature distributions and electric potentials of the grading layers in the bushing at DC voltage. For the first time, it was shown by experiment that the FEM simulation can reproduce real DC field distributions very well. It was also shown, that there is a strong influence of temperature gradients or temperature transients on transient and steady-state electrical potential distribution inside the insulation. Y1 - 2015 CY - Pilsen, Czech Repbulic ER - TY - CHAP A1 - Küchler, Andreas A1 - Schober, F. A1 - Liebschner, M. A1 - Berger, Frank A1 - Exner, W. A1 - Krause, Ch. A1 - Fritsche, R. A1 - Wimmer, R. T1 - Dielectric Behaviour of HVDC Insulating Materials, Polarization and Conduction Processes in Mineral Oil and in Pressboard Impregnated with Different Fluids T2 - 19th International Symposium on High Voltage Engineering Y1 - 2015 CY - Pilsen, Czech Repbulic ER - TY - CHAP A1 - Küchler, Andreas A1 - Schober, F. A1 - Berger, Frank A1 - Exner, W. A1 - Krause, Ch. T1 - Pressboard in HVDC Transformer Insulation T2 - SIP2013 International Conference Science in Practice Y1 - 2013 SP - 27 EP - 29 CY - Bremen ER - TY - CHAP A1 - Küchler, Andreas A1 - Liebschner, M. A1 - Krause, Ch. A1 - Heinrich, B. A1 - Leu, C. A1 - Berger, Frank T1 - Oil Ducts and Solid Insulation in Barrier Systems at HVDC Stresses T2 - 54th IWK Internationales Wissenschaftliches Kolloquium Ilmenau Y1 - 2009 CY - Ilmenau ER -