What Are Winding Oil Ducts and Why Do They Matter?
Quick answer — Winding oil ducts are the cooling channels between the winding discs or layers, through which the oil (or air for a dry-type) flows to carry away the heat. Properly sized and evenly spaced ducts keep the winding temperature uniform and the hot-spot low. A blocked or malformed duct creates a hot spot and accelerated aging, so the duct spacing and the oil flow are an important part of the design.
What are winding oil ducts?
What they are
The vertical (and horizontal) gaps or spacers between the winding discs/layers that let the oil flow through the winding and remove heat.
Why they matter
Uniform, adequate oil flow keeps the winding temperature even and the hot-spot low. A blockage or a narrow duct creates a hot spot.
Design and construction
The duct width, the spacer count and the oil-flow path are set to balance the cooling and the electrical and mechanical design, and are kept clean and open.
References & standards
- IEC 60076-2
- IEC 60076-7
Related
Related manufacturers
Prolec GE (GE Vernova) · Prolec GE Waukesha · Hitachi Energy USA · Siemens Energy · Eaton · Virginia Transformer Corp
Related components
Technical content is prepared from engineering references, standards frameworks, manufacturer documentation and industry sources. Contractual or compliance decisions should refer to current official standards. TransformerPath Technical Editorial.
Source transformers for this application
Submit an RFQ or browse manufacturers and components.
Submit an RFQ Get Verified