HV Termination Deflector Cone Leakage Current
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Solution Overview
Problem
Electrical terminations for high voltage applications above 220 kV face a leakage current issue, which is not effectively addressed by existing polymer insulator-based solutions.
Innovation Solution
A termination design featuring a deflector cone of flexible material covered with a polymer insulator, comprising a first internal insulating element with a conductive deflector, where the maximum diameter of this element is defined by a specific function of the deflector cone's length and impulse voltage, ensuring a larger diameter relative to the conductive deflector, and a second external insulating element with external fins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer insulator with deflector cone is used for high voltage termination, then safety and ease of handling are improved, but leakage current increases at voltages above 220 kV
Solution Approach 1:
The patent changes the geometric parameters of the insulating element, specifically setting its diameter to be at least twice the diameter of the conductive deflector. This parameter modification optimizes the electric field distribution and reduces leakage current at high voltages while maintaining the safety advantages of polymer insulators
2Reliability
If the diameter of the first insulating element is increased to reduce leakage current, then electrical behavior improves, but device complexity increases
Solution Approach 1:
The patent employs a nested structure where the conductive deflector is positioned inside the first insulating element, which itself is covered by a second insulating element with fins. This nested arrangement achieves the required electrical performance through geometric optimization rather than adding complex external components
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 enhances the electrical behavior of the termination by effectively reducing leakage current, particularly at high voltages, while maintaining safety and ease of handling.
Implementation Method 1
a deflector cone of flexible material covered with a polymer insulator comprising a first internal insulating element and containing a conductive deflector
Implementation Method 2
a plastic material reinforced with glass fibers or the like, having good insulating properties... can be used for the inner cylinder and a polymeric material, for example a silicone rubber, can be used for the outer cylinder
Data Source
AI summary
The invention relates to a very high voltage termination comprising, around a central conductor (1), a deflector cone (2) made of a flexible material covered with a polymer insulator comprising a first internal insulating element (3) and containing a conductive deflector (5), said conductor (1) being connected to an output terminal (6). According to the invention, the maximum diameter (D) of said first insulating element (3) at the length (L) of said deflector cone (2) between said conductive deflector (5) and the adjacent end of said output terminal (6) is greater than or equal to twice the maximum diameter (d1) of said conductive deflector (5).