Lightning Arrestor Insulation Casing With Rupture Zones
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Solution Overview
Problem
Conventional lightning arrestors fail to provide adequate mechanical strength and effective pressure relief during short-circuit events, leading to internal component scattering and potential damage to neighboring devices due to uncontrolled arc gas release.
Innovation Solution
A lightning arrestor design featuring a stack of nonlinear resistor elements, terminal electrodes, and insulation supports within a polymer insulation casing with corrugations and strategically placed thin-thickness portions that rupture to instantaneously release arc gas, providing mechanical strength and controlling the pressure-relief direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the insulation casing is made thick to provide mechanical strength, then the mechanical strength is improved, but the arc gas cannot be released instantaneously and internal components may explode
Solution Approach 1:
The insulation casing has different thicknesses at different locations: thick in most areas for mechanical strength, and thin at specific portions for pressure relief. This local quality differentiation allows the casing to simultaneously provide both structural support and controlled rupture capability when arc gas pressure builds up.
2Reliability
If the insulation casing is opened to release arc gas, then the arc gas can be released instantaneously, but internal components may scatter
Solution Approach 1:
The thin-thickness portion is positioned asymmetrically at a specific location on the insulation casing, creating a controlled rupture direction. This asymmetric design ensures that when the casing ruptures, the opening occurs at a predetermined location rather than randomly, allowing better control over component scattering.
Solution Approach 2:
The potential harm of component scattering is converted into a controlled event by designing the thin-thickness portion to rupture in a specific direction away from the zinc oxide component stack. The controlled rupture becomes beneficial by directing arc gas and preventing random scattering that could damage surrounding equipment.
3Reliability
If the thin-thickness portion is provided to release arc gas, then the arc gas can be released, but neighboring devices may be damaged by the released arc gas
Solution Approach 1:
The thin-thickness portion is positioned asymmetrically and oriented at a specific angle to direct the arc gas release away from neighboring devices such as cable support insulators. This asymmetric positioning ensures that the harmful arc gas is discharged in a safe direction rather than toward adjacent equipment.
4Strength
If the insulation material and insulation support are integrally molded, then the mechanical strength is improved, but the freedom of shape is limited and thin-thickness portion cannot be provided
Solution Approach 1:
The integral molding maintains uniform thickness in most areas for structural strength, while incorporating localized thin-thickness portions at specific locations. This local quality variation allows the design to achieve both the mechanical strength of integral molding and the shape flexibility needed for controlled pressure relief.
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 internal component scattering and ensures controlled arc gas release, enhancing mechanical strength and safety in power stations and transformer substations by directing pressure relief away from neighboring devices.
Implementation Method 1
As the inner pressure of the lightning arrestor increases due to the arc gas, the thin-thickness portion is opened instantaneously and serves as a pressure-releasing portion to discharge the arc gas
Data Source
AI summary
A plurality of insulation supports are provided around a zinc oxide component, and the zinc oxide component and a plurality of insulation supports are integrally molded into an insulation casing. The insulation casing has corrugations on its outer surface. A thin-thickness portion is provided between the corrugations. The thin-thickness portion is provided between the insulation supports.