Conference proceedings article
Evaluierung einer CCD Kamera zur Detektion von UV-Emissionen durch Koronaentladungen

Publication Details
Raulf, T.; Claudi, A.; Zander, R.; Fuchs, C.; Tutsch, W.
Berlin, Offenbach
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VDE-Hochspannungstechnik 2018


For the
operation of transformer stations and high-voltage overhead lines, but also for
laboratory operation, possibilities are sought to detect and precisely locate
corona discharges. In most cases, these are unwanted discharges and often an
indicator of defects that lead to electrical overload or degradation in
insulating materials and ultimately result in failure. Especially on overhead
lines, corona discharges can be an indication of defects, ageing, damage or
incorrect installation of armatures, conductor and earthing ropes or

The state of the
art are UV cameras that use image intensifier technology to make comparatively
low UV emissions visible. In the application scenario of an overhead line
inspection flight by helicopter, the cameras available on the market reach
their limits. This cameras should be used during an inspection flight parallel
to the visual inspection, but this is currently not possible due to the focal
length and resolution of the camera system. According to this, a different
flight route would have to be flown using state-of-the-art UV cameras, which
excludes a visual inspection due to the distance to the mast and conductor
rope, so that separate flights would have be carried out for a visual
inspection and a corona detection.

For this
application, the use of a compact and powerful camera with charged coupled
device sensor (CCD sensor) was investigated as part of a research project. The
camera is theoretically capable of detecting the UV emissions of corona
discharges in the range of 250 nm - 400 nm.

The first tests
on the performance of the camera system are promising and prove its
feasibility. The use of the camera requires a preselection of the spectral
range in order to take full advantage of the dynamics of the camera and to
avoid overdriving the sensor. For this purpose, filters with different bandpass
characteristics were examined and the UV sensitivity of the camera at different
intensities of the corona discharges on the surface and at peak-plate
arrangements were determined.

Last updated on 2018-22-11 at 13:10