High-Voltage Insulator Shielding for Triple-Point Discharge Control
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Solution Overview
Problem
High-voltage insulators face damage from electrical partial discharges at the triple-point region where the insulating pipe, silicone shielding, and flanges meet, due to high field strength, leading to reduced service life and vulnerability to environmental stresses.
Innovation Solution
A method involving a substantially rotationally symmetrical insulating pipe with an applied insulating sheath and circumferentially attached insulating strip, formed from materials like glass-fiber-reinforced plastic and HTV silicone, which reduces electric field strength and enhances impermeability by extending the creepage distance and providing additional shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional high-voltage insulator structure is used with flanges connected to insulating pipe and silicone shielding, then the insulator can be assembled and fastened, but electrical partial discharges occur in the triple-point region due to high field strength
Solution Approach 1:
An insulating strip made of highly insulating material (such as polytetrafluoroethylene or polyimide) is introduced as an intermediary component between the conductive flange and the insulating pipe. This intermediary layer eliminates direct contact between conductive parts, thereby eliminating the high field strength region that causes partial discharges, while still allowing mechanical fastening function.
Solution Approach 2:
The insulator is divided into distinct functional zones: the flange region with insulating strip for electrical isolation, the insulating pipe region for mechanical support, and the silicone shielding region for field control. By segmenting the structure and applying different materials to different regions, the patent addresses the specific electrical stress at the triple-point without compromising overall functionality.
2Reliability
If insulating materials are applied to reduce field strength, then shielding effectiveness improves, but device complexity increases
Solution Approach 1:
Instead of applying insulating materials throughout the entire insulator, the patent applies the insulating strip only locally at the critical triple-point region where the flange, insulating pipe, and silicone shielding meet. This localized approach provides maximum shielding effectiveness at the most vulnerable point while minimizing added complexity and material usage.
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 significantly increases the service life and shielding effectiveness of high-voltage insulators by reducing electric field strength and enhancing resistance to leakage currents and overvoltages, particularly after vulcanization.
Implementation Method 1
applying at least one insulating strip circumferentially to the insulating pipe... reducing electric field strength... enhancing resistance to leakage currents
Implementation Method 2
enhancing resistance to leakage currents and overvoltages, particularly after vulcanization
Data Source
AI summary
A method produces a high-voltage insulator. The method includes: providing a substantially rotationally symmetrical insulating pipe; applying an insulating sheath to the insulating pipe; fastening at least one flange to at least one end of the insulating pipe; and applying at least one insulating strip circumferentially to the insulating pipe.