Partial discharges (pd) play an important role in the ageing or breakdown scenario of solid, liquid and gaseous insulation systems. Their presence may indicate defects which reduce lifetime or reliability of an HV apparatus. If the partial discharge "signals" are correctly interpreted a risk evaluation may be done. Precondition for a correct interpretation of pd measurements are the understanding of the pd physics (i.e. physical models for the partial discharge process) and of the signal propagation (or transmission) in sometimes quite complex networks of HV apparatus plus the choice of a measurement procedure which is capable of predominantly revealing the partial discharge physics.
展开▼
