Transformer Winding Insulation Aging Reduction via Coolant-Borne Compounds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cellulosic insulation materials in electrical assemblies, such as transformers, undergo significant aging due to thermal stress, leading to a decrease in mechanical and electrical strength, and there is a lack of commercially available thermally upgraded pressboard material.
Innovation Solution
Incorporating a composition containing chemical compounds, such as thermally upgraded paper, into the housing or cooling circuit of a liquid-cooled transformer, allowing these compounds to diffuse into surrounding cellulosic insulation materials, thereby reducing aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellulosic insulation material is used to surround the winding, then insulation is provided, but the material undergoes significant aging due to thermal stress, leading to decreased mechanical and electrical strength
Solution Approach 1:
The patent applies preliminary action by introducing a composition containing chemical compounds (such as thermally upgraded paper) into the housing or cooling circuit before the insulation material undergoes significant aging. These compounds diffuse into the cellulosic insulation material in advance, providing protective effects that slow down the aging process and maintain mechanical and electrical strength over extended service periods.
2Reliability
If thermally upgraded paper is used for direct conductor insulation, then aging properties are improved, but thermally upgraded pressboard material is not commercially available
Solution Approach 1:
The patent employs an intermediary approach by using a composition containing chemical compounds (such as thermally upgraded paper) as a mediator. This composition is introduced into the housing or cooling circuit and diffuses into the cellulosic insulation material, transferring the beneficial thermal upgrading effects without requiring direct use of unavailable thermally upgraded pressboard material. The intermediary composition makes the aging-resistant properties accessible through diffusion rather than direct material substitution.
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 method effectively slows down the aging process of cellulosic insulation materials, improving their mechanical and electrical strength, and maintaining the quality of thermally upgraded paper over time.
Implementation Method 1
allowing these compounds to diffuse into surrounding cellulosic insulation materials
Data Source
AI summary
An assembly includes at least one winding and a housing in which the winding is disposed. The winding has at least one electrical conductor and a cellulosic or cellulose-containing insulation material at least partially surrounds the winding and/or the electrical conductor thereof. The housing is filled with a liquid coolant during operation so that the winding is located in a liquid coolant during operation. In addition to existing cellulose-containing insulation material which encloses the winding and/or the electrical conductor thereof for insulation purposes, the housing and/or a coolant circuit for the coolant contains at least one composition containing chemical compounds for reducing the aging of cellulose-containing insulation material. A method of reducing the aging of cellulosic insulation material of a winding is also provided.