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         shown in figure 13, TSL 8 is configured to ascend tower 2
         and also descend to the ground level. In other examples,
         TSL 8 is configured to descend to levels that are below the
         ground surface.
           In  the  example  shown  in  figure  13,  tower  2 is a verti-
         cal structure that includes guide wire tension assembly 4,
         guide wire 6, TSL 8, rigging 10, and drive mechanism 12.
         A nacelle and generator are mechanically and electrically
         connected to an upper portion of tower 2, which allow two
         or more blades to take advantage of the best winds. The
         connections between guide wire tension assembly 4, guide
         wire 6, TSL 8, rigging 10, and drive mechanism 12 are fur-
         ther discussed below. Tower 2 may be constructed of any
         type of high-strength metal such as steel, carbon, alumi-
         num, wood, or any other material, or any combination of
         materials. In yet another example, tower 2 may be a series
         of sections that are mounted together by flanges and bolts.




                                                              Figure 14: Side view of a guide wire, a tension system spring, and a
                                                              tension loss sensor.
                                                              horizontal direction along the interior portion of tower 2. In
                                                              another example, rigging 10 is mounted to an exterior por-
                                                              tion of tower 2, whereby rigging 10 is further configured to
                                                              be movable in a substantially vertical or horizontal direc-
                                                              tion along the exterior portion of tower 2. Because tower 2
                                                              may take on different form factors, such as an arch, rigging
                                                              10 may also be configured to be movable in a substantially
                                                              horizontal  direction or any other direction along the inte-
         Figure  13: Perspective view of a  system for  detecting guide wire   rior portion of tower 2. Accordingly, because the movement
         tension in a wind turbine.
                                                              of rigging 10 actuates the movement of TSL 8, TSL 8 may
                                                              also be configured to be movable in a substantially vertical
         In  other  examples,  tower  2  may  also  be  coated  with  any
         type of paint and/or sealant. Tower 2 may be any size di-  or horizontal direction along the interior portion of tower 2.
         ameter and height. In other examples, tower 2 is a different   In the example shown in figure 13, there are two riggings.
         form factor other than the vertical structure illustrated in   In other examples, there may be one rigging. In yet other
         figure 13, such as one or more vertical towers that together   examples, there may be three or more riggings.
         form tower  2. In yet other examples, tower  2 may be an   Rigging  10  may be constructed  of  steel,  carbon,  or  any
         arch shape or a square shape form factor.            other suitable high strength material. In one example, rig-
           Guide wire tension assembly 4 is mechanically connected   ging 10 is comprised of a plurality of wires that are twisted
         to guide wire 6 and mounted to a lower portion of tower 2. In
         one example, guide wire tension assembly 4 may be mount-
         ed in a confined space in tower 2. The confined space may
         include such areas as a basement or any space that requires
         specialized procedures and trained technicians to enter and
         subsequently inspect guide wire tension assembly 4. In one
         example, the system may include one guide wire tension as-
         sembly 4. In other examples, the system may include two or
         more guide wire tension assemblies. The number of guide
         wire tension assemblies may be dependent upon the size of
         tower  2, TSL  8, and drive mechanism  12. The number of
         guide wire tension assemblies may also depend upon the di-
         ameter of guide wire 6 and rigging 10.
           Guide wire 6 may be constructed of steel, carbon, or any
         other suitable high strength material. In one example, guide
         wire 6 is comprised of a plurality of wires that are twisted
         together to form a larger wire. In one example, the diameter
         of guide wire 6 is 11 mm. In another example, the diameter
         of guide wire 6 is 5/16 in. In other examples, guide wire 6 is
         of any diameter that exhibits suitable tension and wire rope
         strength necessary for tower service lift applications.
           Rigging 10 may be mounted to an interior portion of tow-  Figure 15: Schematic diagram that illustrates mechanical, electrical,
         er 2 and mechanically connected to TSL 8. Rigging 10 may   and logical connections between the components within a guide wire
         be  configured  to  be  movable  in  a  substantially  vertical  or   tension assembly and a guide wire and a tower service lift.

         62     Wire Rope News & Sling Technology   April 2018
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