Wind Turbine Blade Lightning Receptor and Dielectric Insulation

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Solution Overview

Problem

Wind turbine rotor blades face damage from lightning strikes, including de-lamination, incineration, and explosion risks due to internal arcs, particularly at the blade tip, where existing solutions fail to effectively divert lightning without damaging the electrical conductivity means.

Innovation Solution

A wind turbine rotor blade design featuring a metallic lightning receptor positioned at a distance from the blade tip, with an electrically conducting mesh extending along the blade, and a dielectric washer providing electrical insulation to direct lightning strikes to the receptor, preventing damage to the conducting elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an electrically conducting mesh is applied on the blade surface for lightning protection, then the blade can conduct lightning current, but the mesh is damaged by direct lightning strikes causing de-lamination, incineration, or explosion

Engineering Contradiction:

Improvelightning protection capabilityVSAvoiddamage to conducting elements

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A dielectric washer is introduced as an intermediary component between the lightning receptor and the electrically conducting mesh. This dielectric barrier prevents direct electrical contact, so when lightning strikes the receptor, the current is conducted through the dielectric washer to the mesh without causing direct damage to the mesh elements, thus resolving the contradiction between lightning protection capability and damage prevention

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The lightning protection system is segmented into distinct functional zones: a lightning receptor zone at the blade tip, a dielectric barrier zone, and a conducting mesh zone further from the tip. This spatial segmentation ensures that the high-energy lightning strike is isolated from the vulnerable mesh structure, allowing the system to conduct lightning current while protecting the mesh from direct damage

Inventive Principle:

Principle #1Segmentation

2Reliability

If the lightning receptor is positioned close to the blade tip for effective lightning capture, then the receptor can intercept lightning strikes, but the conducting mesh near the tip is exposed to direct strikes and damaged

Engineering Contradiction:

Improvelightning capture efficiencyVSAvoidexposure of mesh to lightning strikes

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The dielectric washer acts as a mediator that allows the receptor to be positioned close to the blade tip for effective lightning capture while simultaneously protecting the mesh from direct strike damage. The dielectric material provides electrical insulation that prevents the lightning current from directly damaging the mesh, even when the receptor is in close proximity to the tip

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If electrically conductive fibres are used in the blade laminate for lightning protection, then the fibres can conduct lightning current, but the fibres and laminate are susceptible to de-lamination and incineration from direct strikes

Engineering Contradiction:

Improvelightning current conductionVSAvoidde-lamination and incineration of composite material

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The dielectric washer serves as a protective intermediary between the lightning receptor and the electrically conducting mesh, preventing direct lightning strikes from reaching and damaging the conductive fibres embedded in the laminate. This mediation allows the fibres to maintain their lightning conduction function while being protected from the thermal and mechanical damage that would cause de-lamination and incineration

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Significantly reduces the risk of damage to the electrically conducting elements during lightning strikes by ensuring the strike targets the receptor rather than the mesh, maintaining the mechanical integrity and electrical conductivity of the blade.

Implementation Method 1

a dielectric washer providing electrical insulation to direct lightning strikes to the receptor

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 2

at least one metallic lightning receptor at the surface of the blade in proximity of the distal end of the blade tip

Methodology Applied

Scientific EffectLightning conduction: Conduction (electrical)

Data Source

PatentEP2122162B1Wind turbine rotor blade and method of manufacturing such rotor blade

Publication Date: 2017.06.28 VESTAS WIND SYSTEMS AS

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AI summary

The invention relates to a wind turbine rotor blade comprising a blade tip and a lightning protection system. The blade includes at least one metallic lightning receptor at the surface of the bladein proximity of the distal end of the blade tip. The blade comprises a blade shell configured partly by a fibre-reinforced laminate, and the blade also comprises an electrically down-conducting element in the form of a metallic mesh. The electrically down-conducting element extends only to a certain distance from the distal end of the tip of the blade, said distance being larger than a distance between the position of the lightning receptor and the distal end of the tip of the blade. It is hereby ensured that a stroke of lightning will strike the receptor more likely than the electrically down-conducting element.