An investigation of the corona and breakdown pulses in uniform field in presence of UV radiation

Occurrence of partial discharge (PD) corona pulses under uniform field conditions and the nondestructive testing of uniform field electrodes is discussed in this paper. The PD pulses occur in presence of UV radiation and appropriate value of current limiting resistance. The effect of grades of polishing, material of electrodes, gases and their mixtures etc. is studied in detail. It is possible to distinguish the PD pulses produced due to partially developed avalanches, rough surface and due to dust or metallic particles. A possible method of confirmation of cleanliness of electrode surface after mounting them in the cell is suggested.