Abstract
The increasing importance of HVDC transmission systems requires the development and evaluation of suitable basic approaches regarding the partial discharge diagnosis. Although diverse promising approaches are identified, recent research is focused on standard atmospheric conditions. Due to the fact that this is just partly consistent to real operating conditions, additional research is required. Focusing on the time domain analysis of corona discharges, occurring under positive DC voltage stress in air, a measurement method for investigating the influence of varying atmospheric quantities is presented. Measurements are carried out for five different relative humidity levels in the range of 20 % to 95 % and for four different temperature levels in the range of 20 °C to 65 °C. As characterizing pulse shape parameters, the rise time, the pulse width and the fall time are determined as well as the apparent charge. The gained values are compared to each other and reconciled with physical processes.
Highlights
This manuscript was submitted on June 8th, 2018 and revised on June 25th, 2018 as an extended version of the paper “Influence of humidity on pulse shape parameters of positive corona discharges in air at DC voltage” presented at the 17th International Conference on Environment and Electrical Engineering, Milan/Italy, June 2017 [1]
The influence of the temperature level and the humidity level on the pulse shape of positive corona discharges is investigated by considering different climatic conditions
To obtain detailed information regarding the influence of the temperature and the humidity level, the pulse shapes of corona discharges are captured for 13 different climatic conditions
Summary
In addition to a registration of local weak points, the focus of measurement and analysis techniques is in particular on the identification of the location and the type of fault. Under AC voltage stress the phase resolved pattern is the best established and most commonly used diagnostic tool to distinguish between different types of fault [3]. This diagnostic procedure analyzes the link between discharge pulses and the phase angle of their occurrence with respect to the test voltage. A similar recognized diagnostic tool for DC voltage stress does not exist
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