Shielded Insulating Shell Structure for Creepage and Field Stress Control
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Solution Overview
Problem
Traditional shielded insulating shells for solid state transformers have complex structures, increased component count, and poor electrical performance due to separate insulation designs, leading to high electric field stress and low partial discharge resistance.
Innovation Solution
A shielded insulating shell with a first cavity featuring an inner and outer shielding layer, a structure comprising a sequence of shielding, insulating, and air gap layers, and an assembling gap forming a creepage path, which increases the creepage distance and reduces electric field stress by positioning the high voltage shielding layer inside the solid insulation or on its surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate insulation designs are used for phase-to-phase, shell-to-shell, and high-low voltage insulation, then insulation requirements are met, but device complexity and component count increase
Solution Approach 1:
The patent combines multiple separate insulation structures (phase-to-phase insulation, shell-to-shell insulation, and high-low voltage insulation) into a single integrated shielded insulating shell. This unified structure performs all three insulation functions simultaneously, reducing the total number of components and simplifying the overall device architecture while maintaining reliable insulation performance across all required interfaces.
Solution Approach 2:
The shielded insulating shell is designed as a multi-functional component that provides phase-to-phase insulation, shell-to-shell insulation, and high-low voltage insulation all within a single structure. This universal design eliminates the need for multiple dedicated insulation components, thereby reducing device complexity while ensuring all insulation requirements are met.
2Ease of manufacture
If air gap is disposed outside the high and low voltage shielding layers, then assembly is simplified, but electric field stress concentrates and partial discharge resistance decreases
Solution Approach 1:
The patent introduces a solid insulating layer as an intermediary material positioned between the high voltage shielding layer and the low voltage shielding layer, replacing or supplementing the air gap. This solid insulator acts as a mediator that provides both mechanical support for assembly and superior electrical insulation properties, distributing the electric field stress more evenly and preventing partial discharge while maintaining assembly feasibility.
Solution Approach 2:
The insulating structure employs composite materials combining different insulating layers (solid insulation and air gap) with distinct properties. The solid insulating layer provides high dielectric strength and field distribution, while the air gap provides mechanical spacing. This composite approach optimizes both assembly ease and partial discharge resistance by leveraging the strengths of each material type in the appropriate location.
3Device complexity
If integrated cylinder insulating shell or detachable embedded mesh insulating shell is used, then system complexity is reduced, but installation and operation space becomes confined
Solution Approach 1:
The patent divides the shielded insulating shell into multiple separable components or modules that can be assembled in a step-by-step manner. This segmented design allows each component to be installed independently through limited spaces, and then combined to form the complete insulation structure, thereby reducing installation space requirements while maintaining structural simplicity and avoiding the confinement issues of fully integrated designs.
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 solution simplifies the shell structure, reduces the number of components, enhances electrical performance by lowering electric field stress and improving partial discharge resistance, and increases the creepage distance to ensure reliable insulation.
Implementation Method 1
an assembling gap formed on the first structure, which cooperates with the first air gap layer to form a creepage path on the first structure that extends from the inner shielding layer to the outer shielding layer
Implementation Method 2
enhances electrical performance by lowering electric field stress and improving partial discharge resistance
Implementation Method 3
The insulation between the primary side and the secondary side of the high frequency transformer is generally used for isolation by insulation and encapsulation on the high voltage coil
Data Source
AI summary
The present disclosure discloses a shielded insulating shell and an electronic device. The shielded insulating shell includes a shell body provided with a first cavity, with an inner shielding layer near the first cavity and an outer shielding layer far away from the first cavity being formed on the shell body; a first structure formed on the first cavity, and formed by assembling to comprise at least a first shielding layer, a first insulating layer, a first air gap layer, a second insulating layer, and a second shielding layer arranged sequentially from an inner side to an outer side of the first cavity; and an assembling gap formed on the first structure, which cooperates with the first air gap layer to form a creepage path on the first structure that extends from the inner shielding layer to the outer shielding layer.