Browse Prior Art Database

REPAIR OF WIND TURBINE BLADE VIA TAPERED HOLE PATCH

IP.com Disclosure Number: IPCOM000228038D
Publication Date: 2013-Jun-03
Document File: 3 page(s) / 94K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention proposes a use of tapered hole which optimize interface area to be able to bond inside the wind turbine blade. After tapering hole an area is removed. The removed area is re-used to cover the tapered hole. Covering is done with a ply of glass cloth. The whole repair process require one day less than with repair process in prior art. This is mainly due to reusing the existing structure. The repair of the wind turbine blade includes removal of the loop in the lightning strike system to meet original criteria and returning the blade to normal operational condition. The invention provides faster repair and reduces the repair time up tower on the blade. Invention also saves time by re-using or simpler repair replacement of existing structure.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

REPAIR OF WIND TURBINE BLADE VIA TAPERED HOLE PATCH

BACKGROUND

The present invention relates generally to a wind turbine blade and more particularly to use of tapered hole patch to repair wind turbine blade.

Generally, one commonly seen defect in wind turbines consists of a tip ward loop in the aluminum stip. The loop is higher than the surface receptor and causes electric field concentration.  Concentrated electric field acts as the lightning strike attraction mechanism.  To strike the loop, lightening penetrates the blade.  The penetration causes a pressure wave that causes structural blade damage.

Repair of the wind turbine blade involves removal of the loop in the lightning strike system to meet original criteria and returning the blade to normal operational condition. To repair the lightning system of a wind turbine blade, an access hole or window is required.

A conventional technique includes perpendicular cutting of a random area in the core structure for repairing the lighting system of the wind turbine blade.  The removed piece does not fit back in easily and is thrown away in multiple instances.  The cut area is repaired laminate by laminate. Such laminate by laminate repair is an expensive and time consuming technique.

It would be desirable to have an economical and faster technique to repair wind turbine blade.

BRIEF DESCRIPTION OF THE DRAWING

Figure 1 depicts conductor loop in wind turbine blade which forms partial inductor and inhibits charge transfer to ground.

Figure 2 (a) depicts square end of the aluminum strap requiring repair

Figure 2 (b) depicts correct configuration of the strap.

DETAILED DESCRIPTION

 

The present invention provides use of a tapered hole for repairing wind turbine blades. The tapered hole optimizes interface area to be able to bond inside the wind turbine blade. After tapering hole an area is removed. The removed area is re-used to cover the tapered hole. Covering is done with a ply of glass cloth. The whole repair process require one day less than with repair process in prior art. This is mainly due to reusing the existing structure.

The invention provides approach to repair the area which is difficult to access. The tapered hatch area can be cut around area to be repair. The tapered hatch area is removes and taken down from tower for simpler repair. Then the repaired hatch is transported back to the blade. Then the tapered hatch laminate around the...