Erfahrungen mit der Teilent-ladungs-Diagnose an in Betrieb stehenden öl-/papierisolierten Hochspannungswandlern

摘要

The absence of internal partial discharges (PD) is an essential requirement for the safety operation of oil-paper insulated HV instrument transformers along the entire service period on site. Internal PD may be activated e.g. by external overvol-tages or eventual quality problems during manufactoring. If not recognized in time, steady internal PD may lead to a suddenly drop out of the device. Experiences of power utilities show, that the reason for several failures of HV instrument transformers can be traced to intenal PD. In order to avoid comparatively high damages caused by breaking down instrument transformers a big demand arises to recognize HV instrument transformers including dangerous PD sources. Since several years partners of industry and education are busy in developing diagnostic tools to perform on-line PD measurements with sufficient sensitivity, especially for on site conditions. The following paper shall report about experiences with a PD measuring system mentioned above.%Seit Jahren bemühen sich Hochschulen, Institute und Industrie um die Entwicklung von aussagefähigen und in der Praxis anwendbaren TE-Meßverfahren, die es zulassen, an in Betrieb stehenden Hochspannungswandlern Teilentladungen mit ausreichender Empfindlichkeit zu diagnostizieren. Die Verfasser berichten über praktische Erfahrungen mit einem solchen TE-Diagnoseverfahren.