Corona Location in Transformers by Radio Frequency Spectrum Analysis II. Application of Technique and Results of Measurements

This paper gives a detailed account of the practical application of the technique of corona location in transformers by radio frequency spectrum analysis. The measurements are similar to the usual NEMA corona measurements taken at the bushing tap with a radio noise meter, except an X-Y recorder is used to plot the corona frequency spectrum and a current probe used at the neutral. The theory outlined in Part I is verified by extensive measurements taken from a model transformer using a pulse generator to represent a corona source, and by computer analysis of simulated transformer networks and by practical results.