Corona pulse probability density function measurements on primary distribution power cables

A multichannel pulse-height analyzer has been used to carry out statistical analyses of the corona pulse density patterns of EPR and XLPE insulated distribution cables. The corona pulse probability density functions obtained on these cables were studied as a function of applied voltage and time. The practical implications of the test results are discussed in the light of present corona level specifications, cable insulation geometry and type as well as insulation system life.