High-Voltage Lead Structure for 3D Wound Transformer Core
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Solution Overview
Problem
Traditional transformers with three-phase wound cores face difficulties in lead arrangement due to the need for long lead lengths and complex insulation fixation, especially when connecting high-voltage windings to a tap switch.
Innovation Solution
A novel high-voltage lead structure for a three-dimensional wound core, where the A-phase, B-phase, and C-phase windings are arranged within triangular core legs and upper/lower iron yokes, with lead-out wires connected to a tap switch outside the upper iron yoke, allowing for reduced lead length and simplified clamping through strategic positioning of the B-phase lead-out wire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lead-out wires are led out in two or three directions from the transformer body, then the transformer can be connected to the switch, but the lead length increases and insulation fixation becomes more difficult
Solution Approach 1:
The patent repositions the tap switch from inside the triangular structure to outside, along the vertical extension line of the midpoint between A-phase and C-phase windings. This spatial reconfiguration in three-dimensional space allows lead-out wires to be routed more efficiently, reducing lead length and simplifying insulation requirements while maintaining all necessary electrical connections.
2Volume of stationary object
If the tap switch is positioned inside the triangular structure, then the structure is compact, but the lead-out wires require longer paths and more clamping pieces
Solution Approach 1:
The tap switch is extracted from the interior of the triangular structure formed by the three-phase windings and repositioned outside along the vertical extension line. This extraction separates the switch positioning from the winding configuration, allowing optimized lead routing that reduces the number of clamping pieces and simplifies the overall lead arrangement while maintaining structural compactness.
3Adaptability or versatility
If lead-out wires are routed through complex paths, then all phases can be connected to the switch, but the number of discharge points to ground increases, reducing reliability
Solution Approach 1:
The patent positions all three phase lead-out wires (A-phase, B-phase, and C-phase) to converge at the single tap switch location outside the triangular structure. This merging of lead paths at a unified external position reduces the number of discrete discharge points to ground, thereby improving system reliability while maintaining the ability to connect all phases to the switch.
Data Source
AI summary
A high-voltage lead structure for a three-dimensional wound core of a transformer that includes a three-dimensional wound core spliced by three rectangular single frames, and A-phase, B-phase and C-phase windings. The three-dimensional wound core includes three core legs, an upper iron yoke and a lower iron yoke. The upper iron yoke and the lower iron yoke of the three-dimensional wound core are triangular structures respectively. The A-phase, B-phase and C-phase windings are correspondingly arranged in the three core legs. Each single-phase winding includes an internal low-voltage winding and an external high-voltage winding. High-voltage windings of the A-phase, the B-phase and the C-phase are jointly connected to a tap switch through lead-out wires. The tap switch is located outside the triangular structure of the upper iron yoke and is arranged in a vertical extension line of a midpoint between the A-phase and C-phase windings.