@incollection{KuechlerLiebschnerReumannetal., author = {K{\"u}chler, Andreas and Liebschner, M. and Reumann, Andreas and Krause, Ch. and Piovan, U. and Heinrich, B. and Fritsche, R. and Hoppe, J. and Langens, Achim and Titze, J.}, title = {Evaluation of conductivities and dielectric properties for highly stressed HVDC insulating materials}, series = {CIGR{\´E} Session 2010}, booktitle = {CIGR{\´E} Session 2010}, address = {Paris}, language = {en} } @incollection{KuechlerReumannZinketal., author = {K{\"u}chler, Andreas and Reumann, Andreas and Zink, M. and Voll, S. and Berger, Frank and Langens, Achim and Titze, J.}, title = {Der Einfluss von Temperatur, Feldst{\"a}rke und Atmosph{\"a}re auf die Alterung von OIP Hochspannungstransformatordurchf{\"u}hrungen}, series = {ETG-Fachbericht 134}, booktitle = {ETG-Fachbericht 134}, publisher = {VDE}, address = {Fulda}, language = {de} } @incollection{KuechlerLiebschnerReumannetal., author = {K{\"u}chler, Andreas and Liebschner, M. and Reumann, Andreas and Fritsche, R. and R{\"o}sner, M. and Schenk, M. and Heinrich, B. and Krause, Ch. and Langens, Achim and Titze, J.}, title = {Bestimmung von Leitf{\"a}higkeiten und dielektrischen Eigenschaften hoch beanspruchter HG{\"U}-Isolierwerkstoffe}, series = {ETG-Fachbericht 125}, booktitle = {ETG-Fachbericht 125}, publisher = {VDE}, address = {K{\"o}ln}, language = {de} } @incollection{KuechlerReumannLiebschneretal., author = {K{\"u}chler, Andreas and Reumann, Andreas and Liebschner, M. and Langens, Achim and Titze, J.}, title = {{\"U}berwachung von Hochspannungsdurchf{\"u}hrungen durch Online-Monitoring und dielektrische Diagnose gealterter OIP-Isolierungen}, series = {ETG-Fachbericht 119}, booktitle = {ETG-Fachbericht 119}, publisher = {VDE}, address = {D{\"u}sseldorf}, language = {de} } @incollection{KuechlerReumannLiebschneretal., author = {K{\"u}chler, Andreas and Reumann, Andreas and Liebschner, M. and B{\"o}hm, K. and Langens, Achim and Titze, J. and Heil, B.}, title = {Online Monitoring of Capacitance and Dissipation Factor of HV Bushings}, series = {16th ISH International Symposium on High Voltage Engineering}, booktitle = {16th ISH International Symposium on High Voltage Engineering}, address = {Cape Town}, language = {en} } @incollection{KuechlerReumannLiebschneretal., author = {K{\"u}chler, Andreas and Reumann, Andreas and Liebschner, M. and Langens, Achim and Titze, J.}, title = {Online Monitoring of Capacitance and Dissipation Factor Related to Ageing Research Results on OIP}, series = {54th IWK Internationales Wissenschaftliches Kolloquium Ilmenau}, booktitle = {54th IWK Internationales Wissenschaftliches Kolloquium Ilmenau}, address = {Ilmenau}, language = {en} } @incollection{KuechlerReumannBoehmetal., author = {K{\"u}chler, Andreas and Reumann, Andreas and B{\"o}hm, K. and Langens, Achim and Titze, J. and Heil, B.}, title = {Ageing of OIP Bushing Insulation at very High Temperatures}, series = {16th ISH International Symposium on High Voltage Engineering}, booktitle = {16th ISH International Symposium on High Voltage Engineering}, address = {Cape Town}, language = {en} } @incollection{KuechlerBoehmReumannetal., author = {K{\"u}chler, Andreas and B{\"o}hm, K. and Reumann, Andreas and Langens, Achim and Krump, R. and Titze, J.}, title = {Untersuchung des Alterungsprozesses an den {\"O}l-Papier-Grenzfl{\"a}chen in Transformator-Durchf{\"u}hrungen}, series = {ETG-Fachbericht 112}, booktitle = {ETG-Fachbericht 112}, publisher = {VDE}, address = {W{\"u}rzburg}, language = {de} } @incollection{KuechlerReumannWirthetal., author = {K{\"u}chler, Andreas and Reumann, Andreas and Wirth, Isabell and Langens, Achim and Berger, Frank}, title = {Erfassung transienter elektrischer Potentialverteilungen in thermisch hoch belasteten Gleichspannungsdurchf{\"u}hrungen}, series = {ETG-Fachbericht 144}, booktitle = {ETG-Fachbericht 144}, publisher = {VDE}, address = {Berlin}, abstract = {Mit Hilfe kapazitiver Steuerung k{\"o}nnen Durchf{\"u}hrungen hochspannungsf{\"u}hrende Leiter durch geerdete W{\"a}nde in Geb{\"a}uden oder Ger{\"a}ten f{\"u}hren. Bei zeitver{\"a}nderlichen Belastungen (Stoß-, Wechselspannungen) wird die gew{\"u}nschte Potentialaufteilung durch die Kapazit{\"a}ten zwischen den leitf{\"a}higen Steuerbel{\"a}gen erzwungen. Bei Gleichspannung ergibt sich eine resistive Steuerung, die bei homogener Leitf{\"a}higkeit des Isolierk{\"o}rpers eine prinzipiell gleichartige Potentialaufteilung ergibt. Durchf{\"u}hrungen sind jedoch thermisch hoch belastete Betriebsmittel, in denen starke Temperaturgradienten und in ihrer Folge starke Leitf{\"a}higkeitsgradienten entstehen, die zu einer erheblichen Verschiebung der Potentialverteilung f{\"u}hren k{\"o}nnen [1]. F{\"u}r Design und Diagnose ist das Verst{\"a}ndnis dieser bisher nur theoretisch erfassbaren Vorg{\"a}nge von großer Bedeutung. Deshalb wurden f{\"u}r experimentelle Untersuchungen zwei identische Durchf{\"u}hrungsk{\"o}rper hergestellt, die mit Temperaturf{\"u}hlern f{\"u}r thermische Messungen bzw. mit Anzapfungen f{\"u}r die Erfassung von elektrischen Potentialen ausger{\"u}stet wurden. Die identische Beheizung beider Leiterrohre erlaubt es, eine Korrelation gemessener thermischer und elektrischer Profile und Transienten herzustellen. F{\"u}r r{\"u}ckwirkungsfreie Messung der Gleichspannungspotentiale wurde ein Rotationsvoltmeter benutzt. Die Untersuchungen best{\"a}tigen das theoretisch erwartete thermisch-elektrische Verhalten und sie zeigen, dass erhebliche transiente und station{\"a}re elektrische Belastungen auftreten k{\"o}nnen, die im Zusammenhang mit thermischen Transienten und Belastungen gesehen werden m{\"u}ssen. Sie sind beim Design in Rechnung zu stellen und sie zeigen, dass die bei dielektrischen Diagnosemessungen erfassten Materialkenngr{\"o}ßen wichtige Aussagen {\"u}ber den elektrischen Belastungszustand der Durchf{\"u}hrung liefern k{\"o}nnen.}, language = {de} } @incollection{KuechlerWirthReumannetal., author = {K{\"u}chler, Andreas and Wirth, Isabell and Reumann, Andreas and Zink, Markus H. and Schnitzler, Tim and Langens, Achim and Berger, Frank}, title = {Steady-state and Transient Electrical Potential Distributions in HVDC Bushings Measured under Different Thermal Conditions}, series = {19th International Symposium on High Voltage Engineering}, booktitle = {19th International Symposium on High Voltage Engineering}, address = {Pilsen, Czech Repbulic}, abstract = {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.}, language = {en} }