High Voltage Insulator Arc Protection Ring Design
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Solution Overview
Problem
Existing high-voltage insulators with arc protection rings face issues such as damage from arcs and contamination by bird droppings, leading to earth faults and short-circuits, and existing solutions like canopies are costly and affect mast statics and maintenance.
Innovation Solution
A high-voltage insulator design featuring a long-rod insulator with circular shields, where at least the uppermost shield is designed as a protective shield with a larger diameter to prevent bird droppings and an arc protection ring with specific diameter differences to avoid arc damage, allowing for self-cleaning and reduced risk of contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If arc protection rings are made of metal and arranged at both ends of the insulator, then damage to the insulator from hot arc plasma is prevented, but direct contact or close proximity between the arc and the actual insulator cannot be completely avoided
Solution Approach 1:
The insulator is divided into multiple segments with alternating shield diameters, creating a segmented structure that allows the arc to follow a longer, more controlled path along the insulator surface rather than directly contacting the insulator body
Solution Approach 2:
Different shields are given different local qualities through alternating diameters, where larger shields provide broader arc diversion while smaller shields maintain insulation effectiveness, creating zones of different protective function along the insulator
2Object-affected harmful factors
If canopies are provided directly on the high-voltage pylon above the insulators, then bird droppings are kept away from the insulators, but costs for procurement and assembly are considerable and mast statics are negatively affected
Solution Approach 1:
The alternating diameter shields serve multiple functions simultaneously: they maintain electrical insulation, divert arcs away from the insulator body, and prevent bird droppings from reaching smaller shields, eliminating the need for separate canopy structures
Solution Approach 2:
The insulator structure itself provides protection against bird droppings through its geometric design, where larger shields act as protective umbrellas for smaller shields below, making the system self-protecting without external additions
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 design effectively prevents bird dropping contamination and minimizes arc damage to the insulator, enhancing operational reliability and reducing maintenance complexities while maintaining comparable insulating properties and fitting costs.
Implementation Method 1
Since the arc protection rings are made of metal and are therefore electrically conductive, the arc either forms directly between the arc protection rings or the base points of the arc migrate to the arc protection rings shortly after the arc has formed
Implementation Method 2
at least the uppermost shield of the long-rod insulator closest to the insulator cap is designed as a protective shield for the other shields, with the maximum diameter of the other shields being at least 30 mm smaller than the inner diameter of the arc protection ring
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a high-voltage insulator (1) comprising a long rod-type insulator (10) having a shaft (11) and circular shields (12) which are arranged thereon, comprising an insulator cap (2) at the top end of the long rod-type insulator (10) for fastening the high-voltage insulator (1) to a high-voltage mast, and comprising an arc protection ring (3) which surrounds the insulator cap (2) or that portion of the long rod-type insulator (10) which is situated closest to the insulator cap (2), wherein at least the topmost shield (12) of the long rod-type insulator (10), which shield is situated closest to the insulator cap (2), is designed as a protective shield (12') for the other shields (12''), wherein the maximum diameter of the other shields (12'') is at least 30 mm smaller than the inside diameter of the arc protection ring (3), the diameter of the at least one protective shield (12') is at least 10 mm smaller than the inside diameter of the arc protection ring (3), and the diameter of the at least one protective shield (12') is at least 20 mm larger than the maximum diameter of the other shields (12'').