Summary
Air-cooled generators offer high reliability but face critical thermal challenges in highcapacity units. In this study, an accurate predictive model correlating thermal conductivity with constituent proportions was established and a novel high thermal conductivity (HTC) insulation was developed using global vacuum pressure impregnation (GVPI) technology.
Read more Read lessThe main insulation achieves thermal conductivity of 0.356 W/(m·K), 33% higher than conventional insulation. Accelerated electrical aging data confirm excellent electrical aging performance and IEC 60034-18-32 certification compliance. After 50 thermal cycles, HTC samples maintained low dielectric loss with minimal increment and demonstrated superior post-cycling electrical aging life. The HTC insulation demonstrates approximately 28% higher flexural strength compared to that of conventional insulation at operating temperature
(110℃). In addition, a fluorescence optical fiber temperature measurement (FOFTM) system, first deployed in the HTC GVPI generator, validated 5.4°C hot-spot temperature reduction relative to conventional insulation. An 80 MW/10.5 kV prototype successfully passed qualification tests, providing a technological foundation for large-capacity air-cooled generators.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A1_11451_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | China, People's Republic of |
| Study committees | |
| File size | 2 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
YU Shuangmin - Shanghai Electric Power Generation Equipment Co., Ltd. Generator Plant; ZHANG Yizhong - Shanghai Electric Power Generation Equipment Co., Ltd. Generator Plant; ZHENG Gang - Shanghai Electric Power Generation Equipment Co., Ltd. Generator Plant; WEI Yanfei - Shanghai Electric Power Generation Equipment Co., Ltd. Generator Plant; YANG Baozhe - Shanghai Electric Power Generation Equipment Co., Ltd. Generator Plant
Keywords
