Composite Crossarm Structure for Lightning-Resistant Power Lines
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Solution Overview
Problem
10kV overhead insulated line systems face lightning-induced disconnection accidents, which require frequent maintenance and labor costs due to the instability of existing lightning protection measures like lightning arresters or anti-lightning insulators.
Innovation Solution
The implementation of composite crossarms with a glass fiber reinforced epoxy resin core rod and a silicone rubber shed, which enhances lightning resistance and eliminates the need for regular maintenance by sharing longitudinal strain and providing a stable, maintenance-free solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lightning arresters or anti-lightning insulators are added to protect against lightning strikes, then lightning protection capability is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent combines the lightning protection function with the crossarm structure itself. The composite crossarm integrates conductive elements (steel core or wire mesh) within the insulating material, creating a built-in lightning protection system that eliminates the need for separate lightning arresters or anti-lightning insulators.
Solution Approach 2:
The composite crossarm serves multiple functions simultaneously: it provides mechanical support for the power line, electrical insulation between phases, and lightning protection through its conductive reinforcement. This multi-functional design replaces multiple separate components with a single integrated structure.
2Reliability
If lightning arresters or anti-lightning insulators are added to protect against lightning strikes, then lightning protection capability is improved, but maintenance costs and labor requirements increase
Solution Approach 1:
The composite crossarm's lightning protection function is inherent to its structure, requiring no active maintenance or monitoring. The conductive reinforcement permanently embedded in the insulating material continuously provides lightning protection without needing inspection, adjustment, or replacement like traditional lightning arresters.
3Reliability
If composite crossarms with increased dry arcing distance are used, then electrical lightning resistance performance is improved, but manufacturing complexity increases
Solution Approach 1:
The crossarm is constructed using composite materials - an insulating base material (such as polymer or ceramic) reinforced with conductive elements (steel core, wire mesh, or fiber). This composite structure simultaneously achieves the required dry arcing distance for electrical insulation and provides lightning protection through the conductive reinforcement.
Solution Approach 2:
The conductive reinforcement is strategically positioned within the insulating material at specific locations where lightning strikes are most likely to occur. This localized placement of conductive elements provides effective lightning protection while maintaining the overall insulating properties and dry arcing distance of the crossarm.
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 composite crossarms significantly reduce labor costs and improve lightning protection stability, preventing line disconnection and flashover accidents while maintaining electrical performance for up to thirty years without requiring periodic inspection.
Implementation Method 1
a composite crossarm includes a core rod, a sleeve, and a silicone rubber shed. Both the sleeve and the silicone rubber shed are wrapped on an outer circumferential surface of the core rod. The core rod is a glass fiber reinforced epoxy resin pultrusion rod.
Implementation Method 2
with the composite of the bodies of the composited crossarms, a dry arcing distance is significantly increased, and electrical lightning resistance performance is enhanced, preventing accidents such as line disconnection and flashover caused by lightning strike.
Implementation Method 3
Before the silicon rubber shed is wrapped on the core rod, the sleeve is sleeved on the core rod first, so that the force experienced by the composite crossarm when it is fixed to the strain power pole acts on the sleeve. In this way, damage to the silicone rubber shed can be avoided, and corrosion of the core rod due to the external moisture can be prevented.
Data Source
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AI summary
An overhead power distribution line (10) comprises a tension resistant pole (101), two composite crossbeams (102) and tension resistant fixing members (103). A middle portion of the composite crossbeam (102) is horizontally secured on the tension resistant pole (101), and end portions of the composite crossbeam (102) are connected to the tension resistant fixing members (103). The tension resistant fixing members (103) enable the two composite crossbeams (102) to integrally connect and are for fixing conducting lines. With the above configuration, two composite crossbeams (102) are secured on the same horizontal plane of the tension resistant pole (101), thus satisfying vertical tension of a tension resistant requirement. Further, by using composited crossbeam bodies (102), a dry arc distance is significantly increased, and electrical lightning resistance performance is enhanced, preventing incidents such as line disconnection and flashover caused by lightning strike. The composite crossbeams (102) are maintenance-free and do not require periodical inspection and maintenance, significantly reducing labor costs. The use of crossbeams (102) can further eliminate the use of tension insulators and simplify the structure of lines.