Wind Turbine Lightning Receptor Band for Safer In-Place Maintenance
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Solution Overview
Problem
The existing lightning protection systems for wind turbine rotor blades, particularly those with carbon-fibre-reinforced polymer components, face challenges in safely guiding lightning strikes and require frequent maintenance, which is hazardous and inefficient due to the need to detach and reattach components at elevated heights.
Innovation Solution
A lightning receptor assembly with a conductive band that forms an electrical connection to the receptor unit without requiring removal of the receptor from its base, featuring a cut-out to enclose the threaded connector, allowing for in situ replacement and enhanced surface area for lightning attraction, made of conductive materials like copper or copper alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the receptor is detached to remove the old conductor band, then the conductor band can be replaced, but the risk of parts falling and causing injury increases
Solution Approach 1:
The invention divides the receptor assembly into separable components: the receptor body remains attached to the rotor blade, while the conductor band is a separate replaceable component. This segmentation allows the conductor band to be replaced without detaching the entire receptor assembly, eliminating the risk of parts falling from height during maintenance.
Solution Approach 2:
The invention introduces an intermediary retaining mechanism (such as a retaining ring, clip, or interference fit structure) that connects the conductor band to the receptor body. This intermediary allows the conductor band to be securely held during operation but easily released during maintenance, providing controlled access without complete detachment and preventing uncontrolled falling of components.
2Reliability
If a threaded bolt and washer are used to clamp the conductor band, then the electrical connection is secure, but the handling of small parts becomes difficult at height
Solution Approach 1:
The invention merges the retaining function and electrical connection function into an integrated structure. The conductor band is designed to be retained by the receptor body through mechanical means (interference fit, retaining ring, or deformation of the band itself) rather than separate small fasteners. This eliminates the need to handle threaded bolts and washers at height while maintaining secure electrical and mechanical connection.
Solution Approach 2:
The invention extracts the small fastening components (threaded bolts and washers) from the maintenance procedure by designing a retention system that uses the receptor body's own structure to hold the conductor band. The conductor band may be deformed, clipped, or interlocked with the receptor body, eliminating the need for separate fasteners that are difficult to handle at height.
3Reliability
If the receptor band is made of conductive material to increase attraction area, then lightning strike probability increases, but the complexity of the assembly increases
Solution Approach 1:
The conductor band serves multiple functions simultaneously: it increases the lightning attraction area, provides electrical conduction path, and acts as its own retaining component through its structural design. The band may be deformed, clipped, or interlocked with the receptor body, combining retention and conduction functions in a single element, thereby reducing overall assembly complexity despite the added functional capability.
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
Facilitates safe and efficient maintenance by minimizing the risk of parts falling and injury, ensuring reliable lightning protection and compliance with environmental, health, and safety regulations, while reducing the risk of damage to the rotor blade.
Implementation Method 1
a conductive band adapted to lie on the outer surface of the rotor blade and to form an electrical connection to the receptor unit
Data Source
AI summary
The invention describes a lightning receptor assembly (1) for a wind turbine rotor blade (20), comprising a receptor unit (10R, 10B) comprising a receptor base (10B) for installation in the rotor blade interior (200) and a receptor (10R) for placement at an outer surface (20S) of the rotor blade (20); a threaded connector (11) to form a mechanical connection between the receptor (10R) and the receptor base (10B); and a conductive band (12) adapted to extend over the outer surface (20S) of the rotor blade (20) and to form an electrical connection to the receptor unit (10R, 10B) without requiring removal of the receptor (10R) from the receptor base (10B). The invention further describes a wind turbine (2) and a method of preforming a maintenance procedure on a lightning receptor assembly (1) of a rotor blade (20) of a wind turbine (2).