During routine on-line partial discharge (PD) spot testing of high-voltage (HV) cables in a European refinery, unexpected PD activity was detected from a connected 110 kV/6 kV, 63 MVA power transformer. Follow-up investigations and on-line PD monitoring identified multiple PD activities originating from the active part of the transformer. This paper presents the measurement methodology, permanent sensor installation, comparison with dissolved gas analysis (DGA), and benefits of on-line monitoring for predictive maintenance of aged transformers. Results demonstrate that continuous PD monitoring provides superior insight into the insulation status and supports effective asset management in industrial facilities.
The paper presents the results of experimental studies on the improvement of operational safety in 6–35 kV distribution networks, based on the implementation of a partial-discharge online monitoring and temperature monitoring systems. The studies were conducted in an operating industrial enterprise of a continuous proc...
P. P. Pavlov· Occupational Safety in Indus...· 0 citations
A 20 kV distribution feeder with high-resistance grounding (HRG) at PLN ULP Sutojayan was investigated to address recurrent maloperation of conventional overcurrent and ground-fault protection under low ground-fault current conditions. The feeder neutral is grounded through a 500Ω resistor, which limits single line-to-...
Yuniar Machmud Genda, D. A. Asfani, D. Riawan· International Seminar on Int...· 0 citations
Currently, insulation faults in the DC system of photovoltaic (PV) power stations are handled by a full shutdown strategy of inverters, and fault branch localization relies on manual inspection, resulting in low efficiency and poor accuracy, leading to prolonged unplanned outages and substantial power generation losses...
Accurate line-loss diagnosis and loss-reduction control are essential for low-voltage distribution transformer areas under high penetration of distributed energy resources (DERs). With electric vehicles (EVs), rooftop photovoltaic (PV) generation, and energy storage systems (ESS) connected at the customer side, traditi...
Cheng-Ming Liu, Jia-Xi Li, Ming Wen et al.· 2026 5th International Confe...· 0 citations
The Kingdom’s electricity distribution networks are moving into a crucial phase of modernisation as the operational strain on low- and medium-voltage assets increases due to growth in renewable generation, industrial electrification, digital service expectations and urban development. Switchgear, ring main units, feede...
Inayathulla Shareef· Veredas do Direito· 0 citations
Reliable operation of medium-voltage distribution networks critically depends on the integrity of cross-linked polyethylene (XLPE) insulated cables. This paper proposes a diagnostic methodology that integrates leakage current (LC) measurement with phase-resolved partial discharge (PRPD) analysis to assess cable insulat...
K. Janprom, Sittadach Morkmechai, Natchanun Prainetr et al.· International Journal of App...· 0 citations
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