Zusammenfassung
Im Kap. 4 wird die Vermeidung von Koronaentladungen bei Verbundisolatoren bzw. mit Verbundisolatoren zusammengestellten Ketten behandelt. Bisher gültige Normen für Isolatorenketten mit konventionellen Isolatoren sind insofern anwendbar, als das Auftreten von kontinuierlicher Korona an Kettenkomponenten oder der Isolatorarmatur direkt geprüft werden kann. Speziell ist für hydrophobe Verbundisolatoren das Phänomen der Wassertropfenkorona (aber auch für konventionelle Isolatoren mit einem Coating) zu berücksichtigen, welches von vielen Faktoren abhängt. Das Design des Verbundisolators, d. h. die Materialauswahl, die Stabilität des Dichtungssystems usw. und die auftretende Belastung am Einsatzort können diesbezüglich eine Rolle spielen. Der Grenzwert der Feldstärke auf der Isolierstoffoberfläche von 4,2 kV/cm kann als konservative Empfehlung gelten. Im Vergleich zur 1. Ausgabe wurden der Wissensstand aktualisiert und die Themen Experimentelle Bestimmung von Wassertropfenkorona an Isolatorketten sowie Beispiele für elektrische Feldberechnungen und daraus resultierende Laboraufbauten aufgenommen. Wann immer möglich, wurde auf die aktuelle Normenlage in IEC und auf Publikationen der CIGRE referenziert.
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Papailiou, K.O., Schmuck, F. (2022). Zur Auslegung von Verbundisolatoren aus Sicht des Koronaschutzes. In: Silikon-Verbundisolatoren. Springer Vieweg, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-64249-8_4
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