Wind Turbine Blade Tip Electrodes for Lightning Suppression

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Solution Overview

Problem

Conventional wind turbine blades fail to consistently guide lightning to the lightning receiving portion, leading to increased direct strikes and inadequate protection for the wind turbine, nacelle, and associated devices, due to detachment caused by centrifugal and wind pressure forces, and aerodynamic characteristic disruptions.

Innovation Solution

A lightning suppression device with an electrical insulator and internal and external electrodes, where the internal electrode is connected to the ground, and the external electrode is designed to reduce potential differences, attached to the wind turbine blade tip using a fixing member to prevent detachment and maintain aerodynamic integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a metallic lightning receiving portion is provided at the tip of the wind turbine blade with a ground line, then lightning can be guided to the ground, but the device detaches due to centrifugal and wind pressure forces

Engineering Contradiction:

Improvelightning protection reliabilityVSAvoiddevice attachment stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The lightning receiving portion is nested within a protective housing structure that integrates with the blade tip. The ground line is routed through protective conduits embedded in the blade structure, protecting it from detachment while maintaining electrical connectivity.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

A flexible protective covering encapsulates the ground line and lightning receiving portion, allowing the assembly to withstand centrifugal and wind pressure forces without detachment while maintaining the electrical path for lightning guidance.

Inventive Principle:

Principle #30Flexible shells and thin films

2Productivity

If the wind turbine blade is made long to increase power generation, then the power generation amount increases, but the blade becomes more susceptible to direct lightning strikes

Engineering Contradiction:

Improvepower generation amountVSAvoidlightning strike susceptibility

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The lightning receiving portion is pre-positioned at the blade tip before the lightning strike occurs. The ground line is pre-installed and electrically connected, creating a ready-made path that intercepts lightning strikes before they can directly hit the blade structure or other components.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The long blade's increased susceptibility to lightning strikes is converted into a benefit by using the blade tip as a controlled lightning intercept point. The lightning receiving portion safely channels the electrical energy to ground, protecting the more valuable nacelle and generator components while allowing the blade to maintain its optimal length for power generation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If a lightning suppression device is mounted at the blade tip, then lightning strikes are reduced, but the aerodynamic characteristics are disrupted

Engineering Contradiction:

Improvelightning strike frequencyVSAvoidaerodynamic characteristics

Core Design Contradiction:

Object-affected harmful factorsVSShape

Solution Approach 1:

The lightning receiving portion is designed with a compact configuration that concentrates the protective function at the blade tip while minimizing the overall volume and surface area added to the blade. This localized approach provides effective lightning protection with minimal disruption to the blade's aerodynamic profile.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The lightning receiving portion and ground line assembly is arranged in a configuration that extends along the blade's longitudinal axis rather than protruding laterally. This dimensional arrangement maintains the blade's cross-sectional aerodynamic shape while providing the necessary lightning protection functionality.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 solution effectively prevents lightning strikes by reducing potential differences and securely attaching the device to the wind turbine blade, minimizing detachment and maintaining the original aerodynamic characteristics, thus enhancing the lightning suppression effect and ensuring the structural integrity of the wind turbine.

Implementation Method 1

an internal electrode 9 and an external electrode 10... the external electrode 10 is designed to reduce potential differences

Methodology Applied

Scientific EffectElectrostatic induction: Electrostatic Induction

Data Source

PatentUS11879436B2Lightning suppression device for wind turbine blades

Publication Date: 2024.01.23 LIGHTNING SUPPRESSION SYST

AI summary

Provided is a lightning suppression device for wind turbine blades that is provided at a tip of a wind turbine blade and suppresses lightning struck on the wind turbine blade, the device including: an electrical insulator attached to the tip of the wind turbine blade and formed of a non-conductive material; an internal electrode attached to the electrical insulator on a side opposite to the wind turbine blade; and an external electrode attached to the electrical insulator so as to surround the internal electrode with a predetermined gap therebetween, wherein the electrical insulator is fixed to the tip of the wind turbine blade by a fixing member, and a ground line is connected to the internal electrode.