Necessity of UHF Sensitivity Check
A article features with on-line check of Sensitivity, which rises an important issue.
S. Meijer1*, J.J. Smit11
Delft University of Technology, Mekelweg 4, 2628 CD, Delft, The Netherlands
In industry, partial discharge technology related to switchgear has been operational for many years. Partial discharge testing has been conducted on both new high voltage switchgear in the laboratory setup, as well as several older HV installations in the utility grid. The results clearly indicate that partial discharge analysis of HV switchgear is an excellent online tool to assess its dielectriccondition. “Dielectric windows” present on existing GIS offer the possibility to pick-up the signals by means of external couplers.In order to check the sensitivity or to prove the possibility to detect a certain PD level, a sensitivity check procedure has beenpublished by Cigre several years ago.
This procedure was mainly focusing on new equipment in which internal sensors are beinginstalled in the factory. In this case, it is possible to make comparison tests in the laboratory between the UHF technique andaccording to the IEC 60270 to get a relation between both readings.For older GIS with PD couplers retrofitted or using externalsensors, usually the laboratory step required in this sensitivity check procedure is not possible due to lack of spare parts. In this contribution, a solution to perform the laboratory test on-site is described.
Proceedings of the International Conference on
Electrical Engineering and InformaticsInstitut Teknologi Bandung, Indonesia
June 17-19, 2007
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