Summary
Dissolved Gas Analysis (DGA) is used worldwide as a maintenance management method for oil-filled transformers. In Japan, the Electrical Technology Research Association (ETRA) has established management standards and diagnostic methods. These standards were established based on the actual operation data. In this study, to establish a new diagnostic method for oilfilled transformers connected to photovoltaic (PV) power generating systems, we conducted
Read more Read lessDGA on 390 oil-filled transformers used in PV power plants in Japan and examined the differences between them and power/industrial transformers. As a result, it was found that transformers connected to PV power plants are prone to overheating and produce more hydrocarbon gases such as methane and ethane, as well as carbon monoxide and carbon dioxide generated from insulating paper, compared to power or industrial transformers. Probable causes of this include load fluctuations due to weather and increased iron core loss and copper loss due to harmonics from the PCS or inverter. To prevent overheating inside the transformer due to these loads, it is necessary to consider in more detail the materials of the iron core and windings, as well as the internal structure of the transformer. It is desirable to continue conducting DGA from the early stages of operation to obtain useful knowledge.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A2_10763_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Japan |
| Study committees | |
| File size | 1 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
YOSHIKAWA Hajime - Yuka Industries Co., Ltd. Japan; SATO Gaku - Yuka Industries Co., Ltd. Japan; KONISHI Yoshinori - Yuka Industries Co., Ltd. Japan; MATSUMOTO Satoshi - Shibaura Institute of Technology Japan
Keywords
Dissolved Gas Analysis, Photovoltaic power generating systems, PCS, IBRs, Iron core loss, Load fluctuations, Oil-filled transformers
