access icon free Partial discharge and noise separation in combined cable–OHLs based on three-phase power ratios

© The Institution of Engineering and Technology
Received 25/06/2016, Accepted 05/02/2017, Revised 01/01/2017, Published 08/03/2017

Partial discharge (PD) detection has been proved as an effective tool for monitoring the insulation condition of high-voltage cables. However, the detection can be seriously affected by pulse-shaped interference from overhead lines (OHLs) when carried out at the cable termination of a combined cable–OHL. In this study, a novel scheme is presented for separating the PD pulses and interference in a combined cable–OHL. First, the characteristics of the currents from different pulse sources are investigated mathematically. On the basis of these characteristics, separation of multiple pulse sources can be realised by projecting the three-phase power ratios extracted from detected signals onto a ternary plot and then constructing maps using the power ratios of the defective phase. The performance of the scheme is subsequently evaluated by both numerical simulations and field applications. Furthermore, a comparison with the well-known time–frequency mapping method is provided. The results demonstrate that by using the proposed scheme, different pulse sources can be effectively identified without requiring stable pulse shapes and a better separation could be achieved compared with the conventional waveform-based approaches.

Inspec keywords: power overhead lines; power cable insulation; signal detection; condition monitoring; numerical analysis; time-frequency analysis; partial discharges; electric connectors

Other keywords: ternary plot; overhead lines; insulation condition monitoring; PD pulse separation; cable termination; defective phase; PD detection; partial discharge detection; multiple pulse source separation; noise separation; pulse-shaped interference; three-phase power ratios; high-voltage cables; numerical simulations; combined cable-OHLs; time-frequency mapping method; signal detection

Subjects: Power cables; Dielectric breakdown and discharges; Power line supports, insulators and connectors; Other numerical methods; Overhead power lines; Signal detection; Insulation and insulating coatings

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