Transformer Holder Creepage Path Extension
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Solution Overview
Problem
High-voltage transformers with rated voltages above 380kV require larger lead-out dome diameters due to insufficient insulation capacity of existing holders, leading to increased mechanical and electrical challenges.
Innovation Solution
A bridge-like holder design with angled sections and circumferential slots on its flat outer sides and side edges, increasing the creepage path and insulation capacity, while optionally incorporating U-shaped insulation plates and a receiving device with an inverse circular segment for enhanced dielectric strength and mechanical support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional holders with straight design are used, then the structure is simple and easy to manufacture, but the insulation capacity is insufficient for high-voltage applications above 380kV
Solution Approach 1:
The holder incorporates angled sections instead of straight lines, creating a curved/angled path for the creepage distance. This curvature increases the effective insulation length along the holder surface without increasing the overall linear dimensions, thereby improving insulation capacity for high-voltage applications while maintaining a manageable structural complexity
Solution Approach 2:
The invention adds angular dimensions to the holder design, transforming it from a simple linear structure to a multi-segmented structure with angles. This dimensional change allows the creepage path to extend along the holder surface in a non-linear fashion, increasing insulation capacity without proportionally increasing the holder's overall length or complexity
2Reliability
If larger lead-out dome diameters are used to compensate for insufficient holder insulation, then the insulation distance is increased, but the mechanical space requirements and structural complexity increase
Solution Approach 1:
The holder is divided into multiple segments with angled sections rather than a single straight piece. This segmentation allows the creepage path to follow a longer, multi-segmented route along the holder surface, effectively increasing the insulation distance without requiring a larger lead-out dome diameter, thus maintaining compact structural dimensions
3Reliability
If the holder is designed with multiple angled sections, then the creepage path is extended and insulation capacity is improved, but the manufacturing complexity increases
Solution Approach 1:
The angled sections are designed with standardized angle values that can be efficiently manufactured using conventional machining or molding processes. The curvature/angling is incorporated into the basic holder geometry rather than requiring complex post-processing, thereby extending the creepage path while maintaining ease of manufacture
Data Source
AI summary
The holder (80) has a U-shaped insulation base module having front flat outer side and two side edges. The base module includes connecting devices at ends of the holder and an inverse circular segment (92) for a shield pipe (100) in a middle region. The base module is bent for multiple times along an extension between the ends, so that a creepage path extension is produced. Multiple slots are formed transverse to the elongate extension of the base module. The slots run at the outer side and the side edges in a plane. An independent claim is also included for an oil transformer.