Transformer Yoke Compensation Winding for Unidirectional Flux
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Solution Overview
Problem
Existing transformers face challenges with unidirectional magnetic flux caused by direct current injection or geomagnetically induced currents, leading to unbalanced saturation, increased losses, and noise emission, which are difficult and costly to address through retrofitting with compensation devices.
Innovation Solution
A compensation winding arrangement is mounted on the transformer core's yoke instead of the winding-supporting limbs, connected to a current control device, allowing for easy and cost-effective retrofitting or manufacturing integration, without modifying the existing winding or core design, to counteract unidirectional flux components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compensation winding is mounted on the winding-supporting limb of the transformer core, then the transformer can compensate unidirectional flux components, but the retrofitting process becomes complex and expensive requiring modification of existing winding arrangement
Solution Approach 1:
The patent relocates the compensation winding from the traditional winding-supporting limb location to the yoke of the transformer core. This spatial relocation to a different dimension/location allows the compensation function to be added without interfering with the existing winding arrangement on the limbs, thereby reducing retrofitting complexity while maintaining compensation effectiveness
2Reliability
If a compensation winding is installed on the transformer core, then unidirectional flux compensation is achieved, but the retrofitting cost increases due to rebuilding of winding arrangement
Solution Approach 1:
By placing the compensation winding on the yoke rather than the winding-supporting limbs, the patent enables a simpler retrofitting process that does not require costly rebuilding of the winding arrangement, thus reducing manufacturing/retrofitting costs while achieving the desired compensation function
Solution Approach 2:
The patent separates the compensation function from the main power transfer function by locating them in different spatial locations (yoke vs. limbs). This segmentation allows the compensation winding to be added independently without requiring modification of the existing power windings, thereby reducing retrofitting costs
3Reliability
If the transformer is disconnected from the grid for an extended period to install compensation device, then proper installation can be performed, but operational downtime increases
Solution Approach 1:
The relocation of the compensation winding to the yoke allows for quicker installation since it does not require disassembly of the winding arrangement or complex modifications to the core structure, thereby reducing the time the transformer needs to be disconnected from the grid
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
This solution enables low-cost retrofitting or manufacturing of transformers with unidirectional flux compensation, reducing losses, noise emission, and extending the operational life of transformers by allowing for efficient compensation of DC components and geomagnetically induced currents.
Implementation Method 1
a compensation winding arrangement (12) which is not disposed on a winding-supporting limb (10) of the transformer core (1), as has hitherto usually been the case, but on the yoke (11) of the transformer core (1)... for compensating a DC component flowing in a limb (10) of the transformer
Data Source
AI summary
A transformer having a magnetic core which includes at least one leg with a winding arrangement and a yoke, wherein a compensation winding arrangement is provided to compensate for a unidirectional flux fraction that flows in the at least one leg, and the compensation winding arrangement is arranged on the yoke.