Wind Turbine Blade Lightning Protection Parasitic Conductor
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Solution Overview
Problem
Existing wind turbine blade lightning protection systems face issues with flashovers due to accumulated water and deposits, leading to potential damage from steam explosions and increased costs for repairs or replacements, especially in offshore installations, and require multiple receptors or conductors for effective protection.
Innovation Solution
Incorporating a lightning down conductor with a first conductive layer having a resistance of 10 to 10,000 Mega Ohm per meter, electrically isolated from the inner conductor, to act as a parasitic conductor and reduce the electrical field during lightning strikes, thereby minimizing streamer and leader formation and preventing flashovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lightning down conductor is used, then lightning strikes can be conducted to ground, but flashovers occur due to accumulated water and deposits causing steam explosions and blade damage
Solution Approach 1:
An insulating layer is introduced as an intermediary between the inner conductor and the outer surface of the down conductor. This insulating layer prevents direct contact between the conductive inner conductor and accumulated water/deposits on the blade surface, thereby eliminating the flashover path while still allowing lightning current to be conducted to ground through the inner conductor.
Solution Approach 2:
The down conductor is constructed as a composite structure combining conductive material (inner conductor) with insulating material (insulating layer). This composite design allows the conductor to simultaneously provide lightning current path and prevent flashovers by isolating the conductive element from potentially conductive surfaces.
2Reliability
If multiple lightning receptors or down conductors are installed along the blade, then flashover risk is reduced, but the solution becomes more expensive and complicated
Solution Approach 1:
The insulating layer acts as a protective intermediary that prevents flashovers along the entire length of the down conductor, eliminating the need for multiple spaced receptors. A single down conductor with proper insulation provides sufficient protection without requiring multiple components.
3Reliability
If the lightning down conductor is exposed on the blade surface, then lightning current can be conducted, but the blade surface is damaged with holes and greater damage occurs
Solution Approach 1:
The inner conductor is nested within the insulating layer, which is then embedded in the blade structure. This nested configuration allows the lightning conduction function to be integrated within the blade without creating surface openings, thereby maintaining blade structural integrity while providing effective lightning protection.
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 and reduces the need for multiple receptors, providing improved protection against positive lightning strikes while maintaining the integrity of the insulation and reducing repair costs by acting as a parasitic conductor without causing damage to the wind turbine blade.
Implementation Method 1
act as a parasitic conductor and reduce the electrical field during lightning strikes
Implementation Method 2
a first conductive layer having a resistance of 10 to 10,000 Mega Ohm per meter
Implementation Method 3
a lightning down conductor electrically connected to the lightning receptor and comprising an inner conductor made of electrically conductive material
Implementation Method 4
an inner conductor made of electrically conductive material imbedded in a bedding insulation made of an electrically non-conductive material
Data Source
AI summary
A wind turbine blade with a lightning protection for a blade with a shell body has at least one lightning receptor arranged freely accessible in or on a surface of the shell body surface, and a lightning down conductor electrically connected to the lightning receptor and comprising an inner conductor made of electrically conductive material imbedded in a bedding insulation made of an electrically non-conductive material. The lightning down conductor further includes a first conductive layer having a resistance in the range of 10 to 10,000 Mega Ohm per meter (MΩ/m). The first conductive layer is located in a transverse distance from the inner conductor and being electrically isolated from the inner conductor.