Studies on location technique of corona and measurement of space charge in transformer oil

An investigation has been made in order to develop a location technique of corona discharge in insulating oil, on behalf of the development of the UHV transformer. This paper describes the principle of analyzing the corona location by making use of electrostatic probes. The corona produces a space charge in the oil, and induces charges on the probes electrostatically. Thus, the location as well as the space charge quantity of the corona can be analyzed, based on the induced charges.