Page 14 - PD Experience on 3-5kV
P. 14

3.9.4  PD Pattern
                       Failure mechanism   Polarity        Load Effect   Temperature Effect   Phase Location

                                                                                               Variable
                       Gap-type Discharges   No predominance   None        Unpredictable      (“Cloud”) or
                                                                                              “rabbit ears”


                          Failure mechanism       Symptoms           Detection Tests     Machine types
                                             PD, white powder,
                         Inadequate cable    insulation           PD, visual inspection   Switchgear, motor
                         spacing                                                      leads
                                             discoloration
































































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