On‐site partial discharge detection of power cables using a novel DAC technique supplied by a capacitor bank

Abstract

Partial discharge (PD) detection has proven to be one of the most acceptable techniques for insulation estimation of power apparatus. A powerful tool for conducting on-site PD detection and location in power cables is urgently needed. In view of this issue, this study covers research and development efforts to design, implement, and test a novel damped AC (DAC) system based on the frequency-tuned resonant technique (AC–DAC). This technique gives a cost-effective solution to on-site PD detection in power cables. The topology and operation principle of the proposed technique are presented and described. The application of a capacitor bank, which is discharged to supply the system during the DAC shot time and recharged during the DAC shot interval time, is also explained in this study. Parameter design and performance evaluation of the proposed technique are simulated by Comsol and Saber. For further validation, the AC–DAC system with a capacitor bank is tested in high-voltage laboratory experiments using both capacitor load and cable load.