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A concept of an integrated transformer test van is introduced in the paper. Several routine electric test techniques (insulation testing, winding resistance, ratio and vector group testing) and advanced diagnostic methods (DFR, SFRA) are at the core of the system. A central control and reporting computer and test leads that are shared among different instruments help to facilitate the workflow. Limited...
The ultra-wide band partial discharge detection is successfully applied to assess on-line the insulation condition of plug-in cable connectors. To enhance the performance of this diagnostic method a series of numerical simulations on the detailed 3D model of the cable termination was conducted. 3D modelling of the UHF wave propagation was based on the finite integration technique. The impacts of sensor's...
Experience in on-line UHF partial discharge detection on high voltage plug-in cable connectors (terminations) for GIS and transformers are presented. Narrow vs. broadband, as well as zero-span measurements were carried out using a spectrum analyzer on a laboratory setup with a built-in artificial PD defect of variable intensity. A sensitivity below 5 pC turned out to be detectable by the presented...
The paper provides essentially a summary of PD measurements applying the UHF range in order to increase the detection threshold, to improve the localization accuracy and to perform on-line measurements of Partial Discharge (PD) in noisy environments. The electromagnetic UHF technique offers good signal to noise ratios, because external PD signals and disturbances can be shielded effectively. A new...
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