Mast Transformer Core Unit Extraction for Corrosion Protection
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Solution Overview
Problem
The existing mast transformers are handicapped by an unstable and insecure resin block and core unit, prone to environmental influences and corrosion, which affects the transformer's stability and performance.
Innovation Solution
A transformer design with a solid insulating winding block and an externally arranged core unit that extends through a central retention opening, using a ring portion and retaining means for secure fastening to the mast, and impregnating the core with a polymer for corrosion protection, along with a supporting frame for additional protection and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the core unit is arranged internally within the resin block, then the structure is compact, but the core is vulnerable to environmental influences and corrosion
Solution Approach 1:
The core unit is extracted from the internal position within the resin block and relocated to an external position surrounding the winding block. The core limb extends through a retention opening in the resin block, allowing the core to be positioned externally while maintaining functional connection. This extraction protects the core from environmental influences and corrosion that would affect an internally positioned core.
2Stability of the object's composition
If the core and resin block are rigidly connected, then structural stability is improved, but thermal expansion differences cause cracks
Solution Approach 1:
The connection between the core unit and resin block is segmented rather than rigid. The core limb passes through a retention opening that allows relative movement between the core and resin block. This segmentation accommodates differential thermal expansion between the metallic core and the resin material, preventing cracks while maintaining structural stability during operation.
3Stability of the object's composition
If complex retaining means are used to secure the core and resin block, then retention stability is improved, but device complexity increases
Solution Approach 1:
The retaining means serves multiple functions simultaneously: it secures the core limb to the mast, provides structural support for the winding block, and protects the core unit. The retaining means is integrally connected to the mast structure, eliminating the need for separate complex fastening systems while achieving stable retention of both the core and resin block.
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 design creates a stable and cost-effective transformer unit that prevents thermal expansion-related cracks, provides effective corrosion protection, and allows for rapid and secure mounting on a mast while protecting against environmental influences.
Implementation Method 1
The higher- and lower-voltage windings are inductively coupled to one another by means of an iron core
Implementation Method 2
eddy currents occur during operation which are responsible for the heat-up of the core unit
Implementation Method 3
The associated geometrical expansion of the core unit is dependent upon the magnitude of the magnetic field and the coefficients of thermal expansion of the core material employed
Implementation Method 4
impregnating the core with a polymer for corrosion protection
Data Source
AI summary
A transformer for mounting on a mast of an air-insulated energy distribution network has a core which is protected against corrosion and environmental influences, while at the same time stable retention is provided. The transformer contains a winding block having a solid insulating body, in which at least one upper voltage winding and at least one lower voltage winding are arranged. The winding block delimits a completely peripherally closed central retention opening. Furthermore, a core unit is provided which has at least one magnetizable core and is inductively coupled to each lower voltage winding by each upper voltage winding. The core unit extends through the retention opening via at least one core leg and annularly extends around the winding block on the outside by a ring portion. Retention devices are provided for fastening the ring portion to the mast.