Permeable Element Cooling for Sealed Electrical Machine Bushings
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Solution Overview
Problem
Existing sealed electrical machines face challenges in efficient cooling of lead conductors and bushings due to complex assembly processes and limitations in dielectric strength, leading to inefficient heat removal in large power generators.
Innovation Solution
A sealed electrical machine design featuring a casing with a high pressure chamber and a low pressure chamber, utilizing a permeable element and a cooling fluid that circulates through the electrical connectors to efficiently cool both the lead conductors and bushings, while simplifying the assembly process and enhancing dielectric strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If Teflon pipes are directly connected to lead conductors and bushings for cooling, then cooling function is provided, but dielectric strength is insufficient requiring minimum pipe length
Solution Approach 1:
A permeable element is introduced as an intermediary component between the cooling fluid supply and the electrical connection elements. This permeable element allows cooling fluid to pass through while providing sufficient dielectric strength, eliminating the need for long Teflon pipes and enabling direct connection without compromising electrical insulation.
2Temperature
If multiple Teflon pipes are connected to cool lead conductors and bushings, then cooling function is achieved, but assembly becomes complicated and time consuming
Solution Approach 1:
Multiple cooling functions for lead conductors and bushings are merged into a single integrated system. The permeable element provides a common cooling pathway that serves multiple electrical connection elements simultaneously, eliminating the need for separate Teflon pipes for each component and greatly simplifying assembly.
3Ease of manufacture
If cooling fluid is injected from injector away from bushing duct, then assembly is simplified, but cooling efficiency is reduced
Solution Approach 1:
The injector component is extracted and eliminated from the system. Instead of injecting cooling fluid from a separate injector located away from the bushing duct, the permeable element directly channels cooling fluid to the electrical connection elements, achieving both simplified assembly and efficient cooling.
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 solution provides quick and easy assembly, improved dielectric strength, and efficient cooling of electrical components, addressing the inefficiencies and complexities of existing systems.
Implementation Method 1
the cooling fluid passing through the chamber and the permeable element cools the permeable element
Implementation Method 2
cooling fluid passes through the chamber and the permeable element cooling the permeable element, wherein said cooling fluid comes from a heat exchanger
Data Source
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AI summary
The electrical connection (1) of a sealed electrical machine comprises a casing (2) containing lead conductors (3) each connected to a bushing (4) via an electrical connector (5). The casing (2) has at least an inlet (6) and an outlet (7) for a cooling fluid. The electrical connector (5) comprises at least a permeable element defining a chamber (10) such that during operation the cooling fluid, passing through the chamber (10) and the permeable element, cools the permeable element. The method also refers to a method for cooling an electrical connection.