Reversible Dielectric Cooling Flow for Transformer Hotspot Control
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Solution Overview
Problem
Conventional cooling methods for high voltage static electric induction systems, such as power transformers, result in hotspot formation due to the Venturi effect, leading to insulation material aging and potential damage, and do not effectively distribute cooling fluid to eliminate hotspots.
Innovation Solution
A static electric induction system with a pump arrangement that alternates the flow direction of cooling fluid through a cooling passage structure between forward and reverse directions to redistribute hotspot locations, using a reversible pump to manage temperature distribution and extend insulation life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling fluid is pumped through cooling passage structure in a single direction, then cooling is provided to the windings, but hotspot formation occurs due to the Venturi effect and stagnant fluid
Solution Approach 1:
The pump arrangement alternates between a first operating mode pumping cooling fluid in a first direction through the cooling passage structure and a second operating mode pumping cooling fluid in a second direction opposite to the first direction. This periodic reversal of flow direction prevents stagnant fluid accumulation and eliminates persistent hotspot formation caused by the Venturi effect, thereby improving cooling effectiveness and reducing insulation material ageing.
2Temperature
If flow rate of cooling fluid is increased to improve cooling, then winding temperature is reduced, but hotspot formation is not eliminated due to static swirls and locally stagnant fluid
Solution Approach 1:
Instead of continuously increasing flow rate to improve cooling, the invention reverses the flow direction periodically by switching the pump arrangement between two operating modes. This inversion of flow direction prevents the formation of static swirls and locally stagnant fluid that persist at high flow rates, thereby eliminating hotspots while maintaining effective cooling.
3Temperature
If conventional cooling system design is used, then cooling function is provided, but system size is increased and compact design is limited
Solution Approach 1:
The pump arrangement serves multiple functions: it pumps cooling fluid through the cooling passage structure, reverses flow direction to prevent hotspots, and enables compact system design. By making the pump arrangement reversible and multi-functional, the system achieves effective cooling without requiring additional components or increasing overall system volume.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The alternating flow direction effectively moves hotspot locations, reducing insulation material aging and enabling a more compact, reliable, and efficient cooling design.
Implementation Method 1
a pump arrangement arranged to be controlled in a first mode to pump the cooling fluid to be driven through the cooling passage structure in a forward direction and in a second mode to pump the cooling fluid to be driven through the cooling passage structure in a reverse direction
Implementation Method 2
The windings are often subjected to currents that result in heat development that can damage the windings or the insulation material if cooling of the windings is not to be provided
Implementation Method 3
The windings are typically electrically insulated by means of an insulation material
Data Source
AI summary
A sialic electric induction system is provided. The static electric induction system includes a heat generating electric component; a dielectric cooling fluid; a cooling passage structure along the electric component; and a pump arrangement arranged to alternatingly be controlled in a first mode and in a second mode. In the first mode, the pump arrangement pumps the dielectric cooling fluid to be driven through the cooling passage structure in a forward direction to cool the electric component, and in the second mode, the pump arrangement pumps the dielectric cooling fluid to be driven through the cooling passage structure in a reverse direction, opposite to the forward direction, to cool the electric component. A method of controlling a static electric induction system is also provided.