Transformer Cooling Duct Layout to Prevent Winding Hot Spots

The axial cooling duct is segmented into multiple flow paths by introducing radial cooling ducts that connect to it. The flow obstruction divides the axial flow into a main flow path and a bypass path, creating segmented flow distribution that prevents recirculating flows and ensures even oil distribution across different radial ducts, thereby reducing winding hot spot temperatures while maintaining high cooling performance

The flow obstruction acts as an intermediary element in the axial cooling duct. It mediates the coolant flow by creating a controlled bypass path that redirects a portion of the flow through the radial cooling ducts. This intermediary structure prevents direct recirculating flows and ensures proper flow distribution to the windings, resolving the contradiction between high flow rates and hot spot reduction

The flow obstruction is integrated directly into the axial cooling duct structure, merging the flow control function with the existing cooling duct. The radial cooling ducts are combined with the axial cooling duct to form a unified cooling system. This merging approach achieves effective flow distribution and temperature reduction without adding separate complex control mechanisms, thereby limiting device complexity while improving cooling

The flow obstruction serves multiple functions simultaneously: it acts as a flow divider, creates a bypass path, controls flow distribution to radial ducts, and prevents recirculating flows. The radial cooling ducts also serve dual purposes as both cooling passages and flow distribution channels. This multi-functionality reduces the need for additional components, achieving effective cooling without proportionally increasing device complexity