Browsing by Author "Urban, R. G."
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- ItemModelling corona noise on high voltage transmission lines(Stellenbosch : Stellenbosch University, 2001) Urban, R. G.; Reader, H. C.; Holtzhausen, J. P.; Stellenbosch University. Faculty of Engineering. Dept. of Electrical & Electronic Engineering.ENGLISH ABSTRACT: The corona performance of a compact transmission line design must be accurately determined. In particular, the conducted radio interference (RI) noise level will significantly affect the power line carrier communication used for teleprotection on the line. This conducted RI noise can be calculated with a numerical transmission line code. This thesis investigates the extraction of corona and RI noise elements for inclusion into such a code. The required RI noise measurements are made in a small laboratory corona cage in the bandwidth 5 kHz to 1 GHz. The measurement system is modelled for frequencies below 30 MHz and corona and RI noise elements are extracted in this low-frequency regime. RI noise measurements are made with a time domain oscilloscope and with a frequency domain EMI receiver and spectrum analyser. A strong correlation is observed between the narrowband peak EMI receiver measurements and the swept narrowband spectrum analyser measurements. Accurate quasi-peak measurements cannot be made in the small corona cage due to a low number of RI sources on the short corona cage centre conductor. The work presented in this thesis will be used in future research to develop a smallscale corona cage, a generation transform for small corona cages and a conversion between peak and quasi-peak or RMS measurements made in the small corona cage.