Evaluation of PD-signal-Localization using histogram methods

sudden outages can be prevented in the power system when online condition monitoring of the related apparatus is performed. In the high voltage equipment, such as XLPE cables, power transformers, medium voltage switchgears and rotating machines, many of the reported outages are arisen from insulation failures and deterioration. Thus, online monitoring of quantities that are originated from insulation failures is useful for on time fault recognition and preventive operation performance. When the strength of insulations is decreased, the partial discharge (PD) signals are occurred in the primary stages. These PDs extend and the total breakdown of the insulation is resulted. Thus, PD signals detection can be used for insulation monitoring of the power system equipment. Online PD detection of the power system apparatus is disturbed by the environmental noises and it is difficult to removing these noises from the PD signals. In this paper a new method based on Histogram concept, is introduced and used for de-noising of PD signals in the XLPE cables online monitoring.

Keywords:

De-noising , PD , XLPE cables , Histogram , Feature distance