Lightning Receptor Assembly for In Situ Band Replacement
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Solution Overview
Problem
The use of carbon-fibre-reinforced polymer (CFRP) components in wind turbine rotor blades increases the risk of lightning interception, leading to potential damage and maintenance challenges due to the need for frequent replacement of receptor bands, which is hazardous and costly, especially when performed at elevated heights.
Innovation Solution
A conductive band is designed to be installed on the rotor blade surface, forming an electrical connection with the receptor unit without requiring removal of the receptor from the receptor base, using a cut-out to accommodate the threaded connector, allowing for safe and straightforward in situ replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded bolt and washer are used to clamp the receptor band between the raised receptor and the receptor base, then the receptor band is firmly secured and electrically connected, but the receptor must be detached to replace the band, creating safety hazards and operational difficulties
Solution Approach 1:
The invention divides the fastening system into two independent parts: a reusable receptor assembly (receptor + receptor base + threaded bolt) and a replaceable receptor band. The receptor band is segmented with a cut-out that allows it to be independently removed and replaced without detaching the receptor from the rotor blade, enabling safe maintenance while preserving the electrical connection reliability.
2Ease of repair
If the receptor is detached to remove an old receptor band, then the band can be replaced, but small parts may be dropped from height causing injury or damage
Solution Approach 1:
The invention extracts the receptor band from the fastening system, making it a separate, independently replaceable component. The band is taken out through the cut-out that allows it to be removed from the exterior without detaching the receptor assembly, eliminating the hazard of dropping small fastening parts from height while maintaining the ability to replace the band for ease of repair.
3Weight of moving object
If CFRP components are used to reduce rotor blade weight, then structural strength requirements are met with less weight, but electrical charge builds up on the conductive carbon during storms, increasing lightning interception risk
Solution Approach 1:
The invention introduces a conductive receptor band as an intermediary element between the CFRP spar cap and the receptor assembly. This mediator provides a controlled electrical path that safely directs lightning current from the conductive CFRP component through the receptor band and into the down-conductor, preventing uncontrolled charge buildup while preserving the weight benefits of CFRP usage.
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 of the lightning protection system, reducing the risk of injury and material loss while ensuring reliable lightning diversion, thus extending blade lifetime and minimizing environmental impact.
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
Implementation Method 2
The connector can be realised as a threaded bolt, with or without a head, and of course with threaded engagement into the receptor base
Data Source
Figure 1
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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).