Biyi Luo, Yang Yang, Zhanpeng Li

Liaoning University of Science and Technology

Abstract：

With the development of power systems towards higher capacity and greater reliability, transformers, as the core equipment for energy transmission, place increasing demands on their thermal management systems, which directly impact operational safety and lifespan. Addressing the inherent conflict between winding support and heat dissipation—where robust support often compromises cooling space, and efficient cooling can lead to uneven stress distribution—this paper introduces a novel cooling duct device for transformer windings. The design focuses on structural characteristics, cooling mechanisms, and adaptability. The device features multiple adjacently arranged cooling duct units, utilizing an integrated design approach of "arc-support structure + obtuse-angle triangular frame + spiral dual air channels." This achieves key performance indicators: winding stress deviation ≤ 5% and convective heat dissipation efficiency improved by 35%, with flexible adaptation to transformers ranging from 500 kVA to 2000 kVA. Validation tests on a 1000 kVA transformer demonstrate that the device stabilizes winding temperature rise below 65 K and maintains excellent long-term operational stability during a 1000-hour, 120% overload test. The solution is suitable for both dry-type and oil-immersed transformers, offering reliable support and efficient thermal management, thereby mitigating insulation aging and extending service life.

Key Words：

transformer winding; cooling duct device; stress uniformity; convective heat dissipation; adaptable design