Wind Turbine Brush Arrangement Canopy Access
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Solution Overview
Problem
The existing brush arrangements for wind turbine lightning protection systems require technicians to enter confined and hazardous spaces for installation and maintenance, posing health and safety risks and increasing costs due to the need for direct access through the spinner.
Innovation Solution
A brush arrangement with a bracket and brush holder that allows for easy installation and maintenance from within the canopy interior, featuring an access opening in the canopy front wall for securing a mounting plate, enabling the bracket and brush holder to be moved in and out without entering the spinner, and a curved bracket design for ease of passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bracket for holding the brush is mounted onto the outside front wall of the canopy, then the brush arrangement provides a stable electrical connection from hub to canopy, but technicians must enter the narrow and confined space in the spinner for installation and maintenance
Solution Approach 1:
The patent inverts the traditional mounting approach by moving the bracket from the outside front wall of the canopy to the inside rear wall of the canopy. This inversion allows technicians to access and maintain the brush arrangement from the spacious canopy interior rather than entering the confined spinner, while still maintaining reliable electrical connection through the hub shaft seal housing.
Solution Approach 2:
The patent introduces the hub shaft seal housing as an intermediary component that facilitates the electrical connection between the rotating hub and the stationary canopy. The brush arrangement is mounted inside the canopy and connects to the hub through this intermediary housing, which contains the brush and provides the electrical pathway without requiring direct external mounting.
2Strength
If the bracket is mounted on the outside front wall of the canopy, then the brush arrangement is structurally stable, but the technician must wear a harness and move slowly in the confined spinner space
Solution Approach 1:
By inverting the mounting location from the outside front wall to the inside rear wall of the canopy, the patent eliminates the need for technicians to enter the hazardous spinner environment. The structural stability is maintained through proper mounting on the canopy interior and connection to the hub shaft seal housing, while the harmful factor of technician exposure to confined space risks is removed.
Solution Approach 2:
The patent extracts the maintenance activity from the hazardous spinner environment and relocates it to the safe canopy interior. The brush arrangement and its mounting bracket are positioned such that all installation, inspection, and maintenance operations can be performed from within the canopy, leaving the spinner entirely out of the maintenance equation.
3Reliability
If the bracket is mounted on the outside front wall of the canopy, then the electrical path is established, but the limited space and cramped environment increase overall costs
Solution Approach 1:
The patent inverts the mounting arrangement to simplify the maintenance procedure. By mounting the bracket on the inside rear wall of the canopy rather than the outside front wall, the electrical path continuity is maintained while the maintenance complexity is reduced, as technicians can easily access the brush arrangement from the spacious canopy interior without the constraints of the confined spinner environment.
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
This design reduces health and safety risks and costs by allowing quick and safe installation, inspection, and replacement of brushes from a safer, more spacious environment within the canopy, eliminating the need for technicians to enter the spinner.
Implementation Method 1
A brush assembly can be secured to the stationary part (e.g. the canopy) so that the brush is continually pressed against the rotatable part
Implementation Method 2
The brush interface should always provide a path of least resistance from the hub to the canopy and bedframe
Data Source
AI summary
Provided is a brush arrangement of a wind turbine lightning protection system, realized to provide a current path from a hub to a canopy of the wind turbine, which brush arrangement includes a brush holder arranged to hold a brush in electrical contact with a contact surface at the exterior of the canopy, which contact surface is electrically connected to the hub; a bracket arranged to electrically connect the brush with a mounting plate; characterized by an access opening in the front wall of the canopy, which access opening is dimensioned to accommodate the bracket and brush holder; and a mounting arrangement for securing the mounting plate to the canopy front wall over the access opening, from within the canopy interior. A wind turbine including a lightning protection system with at least one such brush arrangement is also provided.