TY - CONF A1 - Siebler, Daniel A1 - Rohwetter, Philipp A1 - Brusenbach, R. A1 - Lothongkam, Chaiyaporn A1 - Heidmann, G. A1 - Leistner, A. A1 - Plath, R. T1 - Sensitivity-enhanced detection of partial discharge in cable accessories using fluorescent polymer optical fibre-sensor N2 - A new fluorescent polymer optical fibre sensor (F-POF) has been tested in combination with different single photon counting modules in real-scale model of a translucent high voltage (HV) stress cone for the detection of inner partial discharges (PDs). In experiments with different artificial PD sources these sensors were capable to detect discharges with an apparent Charge down to the limit of a few hundred femto Coulombs even with an unfavorable sensor location. By combining the datasets of the electrical and optical PD measurement (coincidence window ±100 ns) it is possible to suppress background noise and to undoubtedly assign signals to real inner PD events. First results of an optical/optical coincident PD measurement (coincidence interval ±100 ns) including an AC phase-correlated filtering show several coincident photon counts in the ränge of 1-2 pC over the whole Observation interval, indicating the potential ofthis new alternative PD measurement and evaluation method. T2 - POF 2014 - 23nd International conference on plastic optical fibers CY - Hiyoshi, Yokohama, Japan DA - 08.10.2014 KW - Polymer optical fibre KW - Partial discharge sensor KW - Fkuorescence KW - High voltage facility PY - 2014 SP - 1 EP - 5 AN - OPUS4-32531 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lothongkam, Chaiyaporn A1 - Siebler, Daniel A1 - Heidmann, G. A1 - Plath, R. A1 - Gockenbach, E. T1 - The influence of thermal aging on AC dielectric strength of transparent silicone rubbers for HV insulation N2 - Optical methods and monitoring systems for the PD detection in GIS, GIL and oil-immersed type transformers have been demonstrated. Very recently these methods have been extended to the detection of PDs in solid insulation materials of cable accessories. This novel application in high-voltage (HV) cable terminations consists of integrated fiber-optic sensor which requires transparent insulation materials. Therefore, transparent silicone rubbers are considered as replacement material for currently used opaque elastomeric insulation material in stress cones of HV cable accessories. For this purpose a preliminary study on the long-term stability of two commercially available fully transparent silicone rubbers was performed. Accelerated thermal aging tests were carried out for 4 hours up to 100 hours at 200 °C under a normal air atmosphere and normal atmospheric pressure. The impact of thermal aging on the AC dielectric strength of the silicone samples was investigated and additionally the optical transmittance was determined using UV-Vis spectrophotometer. The investigation indicated that the dielectric strength value of the silicone samples was seriously reduced for long-term exposures to elevated temperatures. In addition, the UV-visible transmittance of thermally aged silicone samples was also decreased. The influence of these phenomena must be taken into account for the design of HV insulation materials, particularly under extremely high temperature operating conditions. T2 - ISEIM 2014 - 7th International symposium on electrical insulating materials CY - Niigata City, Japan DA - 01.06.2014 KW - AC dielectric strength KW - Thermal aging KW - Silicone elastomer KW - HV insulation KW - Silicone rubbers KW - Optical transmittance KW - Rubber stress cone PY - 2014 DO - https://doi.org/10.1109/ISEIM.2014.6870790 SP - 346 EP - 349 PB - IEEE AN - OPUS4-32533 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohwetter, Philipp A1 - Lothongkam, Chaiyaporn A1 - Habel, Wolfgang A1 - Heidmann, G. A1 - Pepper, D. T1 - Verbesserte faseroptisch-akustische Teilentladungssensoren für elastomere Isolierungen T1 - Improved fibre-optic acoustic partial discharge sensors for elastomeric insulations N2 - Von uns entwickelte faseroptisch-akustische Sensoren wurden an Modellen für innere Teilentladungen (TE) in Silikonelastomer- Isolierungen erprobt. Bei 32 mm Abstand zu einer eingebetteten TE-Quelle wurde eine äquivalente Empfindlichkeit im Bereich weniger Picocoulomb scheinbarer Ladung erreicht. In einem Versuchsaufbau mit künstlicher TEQuelle, der durch Geometrie und Material ein Hochspannung-Aufschiebeelement simuliert, wurde bei akustisch gewollt ungünstiger Sensorplatzierung ein TE-Detektionslimit von 35 pC scheinbarer Ladung ermittelt. Neben der Leistungsfähigkeit der vorgestellten Sensoren in Bezug auf die Detektion von Wechselspannungs-TE wurde auch ihre Fähigkeit geprüft, Gleichspannungs-TE im elastomeren Isolierstoff zu detektieren. Dabei hat sich gezeigt, dass die akustische Methode bei Gleichspannung ein unerwartet empfindliches Werkzeug zum Aufspüren TE-behafteter Fehlstellen sein kann. N2 - Fibre-optic acoustic sensors developed by us for the detection of partial discharge (PD) in silicone elastomer insulation were tested using artificial embedded sources of PD. Few-Picocoulomb sensitivity was shown for a Separation of 32 mm between PD source and sensor. Additionally, sensor detectivity was investigated on a Setup simulating geometry and material of a real-scale push-on high voltage stress cone. An intentionally unfavourably placed sensor showed an equivalent detection limit of 35 pC apparent Charge. Besides testing sensing performance with respect to AC-PD, also the acoustic detection DC-PD in elastomeric insulation was investigated. This lead to the observation that the acoustic method is an unexpectedly sensitive tool for detecting PD -inducing defects in such materials under DC stress. T2 - 6. ETG-Fachtagung - Diagnostik elektrischer Betriebsmittel 2014 CY - Berlin, Germany DA - 25.11.2014 PY - 2014 SN - 978-3-8007-3648-5 SN - 0341-3934 N1 - Serientitel: ETG-Fachbericht – Series title: ETG-Fachbericht VL - 144 SP - 1 EP - 6 PB - VDE Verlag GmbH AN - OPUS4-32873 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -