Corona discharge streamer model

Starting from the motion of a charged particle in the electric field set up by the conductor system of a power transmission line, the author develops a model for the streamers released when the voltage stress at the surfaces of conductors leads to corona discharges from them. The frequency content of streamer pulses defines the frequency spectrum of radio noise-fields radiated from transmission lines in corona. This is definition which is achieved for the first time in analytical form by the author. From the basis which the waveshape of a single streamer pulse in the time domain provides, multiple point discharges are interpreted as random uncorrelated noise sources in power spectral density form. Comparisons are made between this frequency domain function and previously published corona excitation functions derived from measurement. Noise-interfering fields found from the streamer model are correlated with the results of measurements on a 500 kV double-circuit line energised for test purposes to 522 kV