Wind Turbine Carbon Blade Multi-Down Conductor Equipotential Bonding
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Solution Overview
Problem
Wind turbines experience frequent lightning damage due to high internal voltage differences generated between spaced-down conductors, and single down conductor failures can lead to grounding issues and further lightning damage on the blade surface.
Innovation Solution
A carbon blade for wind turbines is designed with multiple down conductors on both outer and inner surfaces, where the down conductors are bonded at both ends to create an equipotential structure, allowing the inner down conductor to replace a damaged outer one and offset magnetic fields by being disposed in parallel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple down conductors are spaced apart on the blade, then lightning protection coverage is improved, but high internal voltage difference is generated causing flashover
Solution Approach 1:
The patent bonds multiple down conductors together at both ends of the blade using coupling members, creating an equipotential structure. This bonding ensures that all down conductors maintain the same electrical potential, eliminating internal voltage differences that would otherwise cause flashover between conductors during lightning strikes.
Solution Approach 2:
The patent combines multiple down conductors into a unified electrical system by bonding them at both ends. This merging creates a coordinated network where conductors work together as a single equipotential structure, preventing voltage differences while maintaining distributed lightning protection coverage.
2Device complexity
If only one down conductor is disposed, then device complexity is reduced, but reliability is compromised when the down conductor is damaged
Solution Approach 1:
The patent incorporates redundant down conductors bonded together at both ends, creating a backup system before damage occurs. If one conductor is damaged, the bonded structure ensures electrical continuity through the other conductors, providing beforehand cushioning against grounding failure.
Solution Approach 2:
The bonded multi-conductor system allows the undamaged conductors to take over the grounding function if one conductor is damaged. The system automatically recovers functionality by redirecting lightning current through the remaining intact conductors in the bonded network.
3Reliability
If multiple down conductors are disposed in parallel, then reliability is improved through redundancy, but magnetic field interference increases
Solution Approach 1:
The patent positions down conductors at different locations on the blade (outer surface, inner surface, leading edge, trailing edge) rather than symmetrically. This asymmetric distribution, combined with bonding at both ends, helps cancel magnetic fields through spatial arrangement while maintaining redundancy for reliable grounding.
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 configuration minimizes lightning damage by maintaining an equipotential bonding structure and ensuring continuous functionality even if the outer down conductor is damaged, while also mitigating magnetic field effects from multiple down conductors.
Implementation Method 1
both ends of which are connected to the first down conductor by means of coupling members
Implementation Method 2
a plurality of down conductor is disposed in parallel with each other on the outer and inner surfaces of the carbon blade, thereby offsetting the magnetic fields generated from the plurality of down conductors
Data Source
Figure 1~2b
Figure 3~5
Figure 6~7
AI summary
The disclosure relates to a carbon blade for a wind turbine with multiple down conductors, and more particularly, to a carbon blade for a wind turbine with multiple down conductors that includes multiple down conductors disposed thereon to reduce or prevent a potential difference between a plurality of points to be formed thereon from being generated.