Auto-balancing Transformer with Movable Armature
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Solution Overview
Problem
Current three-phase electrical distribution systems face challenges in automatically mitigating current and voltage imbalances due to varying loads, which are typically addressed through manual adjustments, and existing transformer connections like the Scott-type transformer are inadequate for multi-phase systems.
Innovation Solution
The development of an auto-balancing transformer with a movable armature that electromagnetically couples primary and secondary windings, allowing for variable magnetic coupling between phases to redistribute load imbalance, utilizing a yoke and primary/secondary windings configured to adjust coupling based on load conditions, and incorporating a controller to position the armature for optimal balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual changeovers are used to balance loads, then load balancing can be achieved, but operational complexity and time consumption increase
Solution Approach 1:
The transformer automatically detects phase imbalances and redistributes loads without human intervention. The control system continuously monitors phase currents and autonomously adjusts the transformer configuration to balance loads, eliminating the need for manual changeovers by line crews.
Solution Approach 2:
The transformer incorporates sensors that continuously monitor phase current imbalances and feed this information back to the control system. Based on this feedback, the control system automatically adjusts the transformer configuration to correct imbalances, creating a closed-loop control system that maintains balanced loads.
2Adaptability or versatility
If Scott-type transformer connection is used, then three phase power can be transformed into two phase power, but it cannot mitigate imbalance conditions of multi-phase systems
Solution Approach 1:
The transformer uses a movable armature that can dynamically change its position to alter magnetic coupling between windings. This dynamic adjustment capability allows the transformer to adapt to different phase configurations and actively mitigate imbalance conditions, unlike the fixed Scott-type connection.
Solution Approach 2:
The transformer divides the magnetic coupling into separate, independently controllable sections through the movable armature. This segmentation allows selective coupling of primary and secondary windings to specific phases, enabling flexible load redistribution across multiple phases to correct imbalances.
3Ease of manufacture
If fixed mutual coupling is used in transformer windings, then construction is simplified, but the ability to respond to load variation and mitigate imbalances is lost
Solution Approach 1:
The transformer replaces fixed mutual coupling with dynamic, adjustable coupling through the movable armature. The armature can be positioned to create different magnetic coupling configurations, allowing the transformer to adapt its coupling characteristics to match varying load conditions while maintaining a relatively simple overall structure.
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 auto-balancing transformer effectively mitigates unbalanced conditions by dynamically adjusting magnetic coupling, reducing distribution losses, and providing load balancing without the need for manual interventions, thus enhancing the stability and efficiency of three-phase power distribution systems.
Implementation Method 1
a movable armature to selectively electromagnetically couple the second number of secondary windings to one or more of the first number of primary windings
Implementation Method 2
allowing for variable magnetic coupling between phases to redistribute load imbalance
Data Source
AI summary
Auto-balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary windings. The auto-balancing transformer includes a movable armature to selectively couple primary phases with two or fewer phases of the secondary system.