Industrial complexes suffer from crosstalk of Partial Discharge (PD) defects in cable terminations connected to the same medium voltage busbars. This phenomenon happens because the sheath-ground connections of all cables of one switchboard are first fastened together and then connected to ground, which leads to PD pulses being induced from the source termination to others. In this paper, based on mathematical investigations on PD pulse propagation and by introducing an energy-based index, a simple rule-based procedure is proposed for discrimination between defective terminations and healthy ones connected to common busbars. The proposed procedure has been verified by simulations even when there exists noise pollution or multiple defects of different strengths.
This paper presents a novel rule-based method for online localization and phase selection of multiple partial discharge (PD) sources in cross-bonded cable (CBC) networks by simultaneous measurements of PD pulse trains at all link boxes. The proposed method detects PD defective cable sections (localization task) and their corresponding defective phases (phase selection task) regardless of the number of PD sources inside the CBC network and their severity differences. For the first time, the proposed method is capable of detecting more than one PD source by analysing PD pulse trains. Numerous simulations of different case studies performed in EMTP RV software indicate highly accurate performance of the proposed method even at high noise levels.
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