Wind Turbine Blade Down Conductor Resistance Measurement System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wind turbine blade systems face challenges in easily measuring the electrical resistance of down conductors, particularly due to accessibility issues and the need for precise measurements to ensure proper lightning protection and compliance with international standards.
Innovation Solution
A measuring system for wind turbine blades that includes a measuring cable connected in series with the down conductor, allowing for easy measurement by sharing a termination block and utilizing lightning receptors made of materials like aluminum, brass, or stainless steel, with multiple cables for precise bridge measurements to compensate for temperature drifts and supply line resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring cable is connected to the tip receptor of the blade, then the electrical resistance of the down conductor can be measured, but accessing the tip receptor becomes difficult especially for already installed blades
Solution Approach 1:
The measuring system is divided into two separate connection points: the measuring cable connects to the down conductor at the base of the blade, while the other end connects to the tip receptor. This segmentation allows measurement without requiring access to the tip receptor for already installed blades, as the cable can be routed through the blade structure.
Solution Approach 2:
The patent introduces an intermediary connection system where the measuring cable connects to the down conductor at an accessible location (base of the blade) rather than directly at the tip receptor. This intermediary connection point serves as a mediator that provides measurement capability while avoiding the accessibility problem of the tip receptor.
2Reliability
If traditional measurement methods are used without a dedicated measuring cable, then the system is simpler, but accidental shorts cannot be prevented and measurements are less reliable
Solution Approach 1:
The measuring cable is pre-connected to the down conductor at the base of the blade before installation or before measurement is needed. This preliminary connection ensures that the measurement path is established in advance with proper insulation and connection, preventing accidental shorts during the actual measurement process.
Solution Approach 2:
The measuring cable with its built-in connection system provides self-protection against accidental shorts through proper insulation and connection design. The system serves itself by having the cable inherently protected and isolated, eliminating the need for additional protective measures during measurement.
3Measurement precision
If single cable measurement is used, then the system is simpler, but temperature drifts and supply line resistance affect measurement accuracy
Solution Approach 1:
The patent applies different qualities to different parts of the measurement system: the measuring cable has specific insulation properties to minimize resistance, while the connection points have specific contact qualities to reduce temperature drift effects. This local optimization of qualities improves overall measurement accuracy without requiring a completely complex system.
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
Enables easy and precise measurement of the electrical resistance of down conductors, preventing accidental shorts and ensuring accurate lightning current path measurement, facilitating easy installation and reducing replacement efforts post-strike.
Implementation Method 1
the electrical resistance of the down conductor. The electrical resistance of a down conductor of a blade is usually measured from an outside tip receptor to the bottom part of the blade
Implementation Method 2
Two or more measuring cables may be provided for a compensated bridge measurement. Having more than one measurement cable allows for various bridge measurement combinations. Bridge measurements can be more precise and/or can compensate temperature drifts or supply line resistance
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A measuring system for a down conductor (2) of a wind turbine blade (1) includes a measuring cable (11) connected in series with its first end (11a) to the down conductor (2). A second end (11b) of the measuring cable (11) is accessible for measurement of the electrical resistance in a lower base part (4) of the blade (1).