Wind Turbine Down Conductor Connector for Lightning Load Flexibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern wind turbines face challenges in lightning protection due to their tall stature, which increases the likelihood of lightning strikes, and the mechanical and electromagnetic stresses on connection means between down conductors, particularly at movable parts like the rotor blades and hub, leading to potential damage and unreliable electrical connections.
Innovation Solution
A connector arrangement featuring a cable surrounded by a tube, with fixed attachment to one connection element and relative mobility to the other, allowing for torsional and longitudinal loads while minimizing swinging movements and electromagnetic stress, using a flexible cable and rigid tube to maintain electrical conductivity and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid connection means is used to maintain electrical connection between down conductors, then electrical conductivity is improved, but the ability to withstand mechanical loads and deflections is worsened
Solution Approach 1:
The connection means incorporates a flexible cable portion that can dynamically adapt to mechanical deflections and movements between the blade and hub, while maintaining electrical conductivity. This dynamic flexibility allows the system to withstand mechanical loads without compromising the electrical connection reliability.
Solution Approach 2:
The connection means combines different material properties - using a flexible cable construction that integrates conductive elements with flexible support structures. This composite approach enables simultaneous achievement of electrical conductivity and mechanical flexibility to handle dynamic loads.
2Productivity
If the wind turbine height is increased to maximize electrical power output, then power generation capability is improved, but the probability of lightning strike is worsened
Solution Approach 1:
The down conductor system converts the harmful lightning strike energy into a controlled electrical current that is safely conducted to ground. The connection means is specifically designed to handle these high-energy electromagnetic impulses, transforming the harmful lightning effect into a manageable electrical flow that protects the turbine structure.
3Strength
If metal brackets or rigid cables are used as connection means, then structural strength is improved, but the ability to resist magnetic fields and mechanical deflections is worsened
Solution Approach 1:
The connection means employs a flexible cable construction with conductive elements embedded in or surrounded by flexible material. This flexible shell structure provides both mechanical flexibility to accommodate deflections and electrical conductivity to transmit currents, while the flexible nature inherently provides resistance to magnetic field-induced stresses.
4Reliability
If the connection means is fixed between blade and hub, then electrical connection stability is improved, but the ability to accommodate blade deflection and rotation is worsened
Solution Approach 1:
The connection means is designed with dynamic characteristics, incorporating flexible cable portions that can move and deform with the blade deflections and hub rotations. This dynamic design maintains electrical connection stability through continuous contact while accommodating the full range of mechanical movements without rigid constraints.
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 withstands mechanical and electromagnetic loads, ensuring reliable electrical connections and minimizing damage over the turbine's lifetime by restricting swinging movements and reducing stress on the cable, thus maintaining a stable and durable connection.
Implementation Method 1
a lightning conductor cable (11), wherein a first end (15) of the cable (11) is connected to the first connection element (12) and a second end (16) of the cable (11) is connected to the second connection element (13)
Implementation Method 2
wherein a tube (14) surrounds at least a portion of the cable (11) between the first end (15) and the second end (16) of the cable (11)
Implementation Method 3
In addition to the high-amplitude lightning current, also large magnetic fields occur when a lightning current is conducted in the down conductors. Therefore, the connection means must also resist these magnetic fields
Data Source
AI summary
A connector arrangement for a wind turbine down conductor is provided, including a lightning conductor cable, a first connection element, a second connection element and a tube, wherein a first end of the cable is connected to the first connection element and a second end of the cable is connected to the second connection element, wherein the tube surrounds at least a portion of the cable between the first end and the second end of the cable, wherein the tube is fixedly attached to the first connection element and relatively movable to the second connection element.