Abstract:
A tower includes an outer portion forming an outer covering for the wind turbine tower and an inner portion disposed within the outer portion. The inner portion includes a preassembled power module including an upwardly extending support and electrical components that extend outwardly beyond the upwardly extending support and guide supports coupled at a first end to the upwardly extending supports and extending outwardly beyond the electrical components.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    The subject matter disclosed herein relates to an electrical section of towers and, in particular, to safety guide systems for modules within an electrical section of a tower. 
         [0002]    Wind turbines, as known in the prior art, include a tower portion and a rotor mounted on top of the tower portion. The rotor portion may include one or more blades that rotate about a center point (rotor) when in the presence of wind. The rotor motion may then be converted to electrical or other energy by known means. 
         [0003]    Many wind towers include electrical machinery within them for converting rotational energy (from the rotor portion) into electrical energy. To save space the electrical machinery is located within the tower portion. The electrical machinery may include, for example, converter electronics, voltage switch gear and a transformer. In some cases, each of these components may be made in a pre-assembled power module (PPM). The PPM&#39;s are stacked one on top of one another and then surrounded by the tower portion. 
         [0004]    Building a wind tower typically includes first building an electrical tower that includes a plurality of stacked PPMs. The tower portion (either as one piece or in separate pieces) is then lowered down from above to surround the PPMs. Once lowered, the lower tower section is secured to a foundation or tower foundation adapter located on the foundation. 
         [0005]    Typically, as the tower sections are being lowered, a technician is located on each internal level to ensure that the tower section does not contact and, thus, damage the electronics on each of the stacked PPMs. Because wind towers are typically located in areas having frequent wind currents, it is common for wind gusts to move the tower sections as they are being lowered. This could lead to injury to the electronics if contacted by the moving tower sections. 
       BRIEF DESCRIPTION OF THE INVENTION 
       [0006]    According to one aspect of the invention, a tower including an outer portion forming an outer covering for the tower is provided. The tower of this aspect includes an inner portion disposed within the outer portion. The inner portion includes a preassembled power module including an upwardly extending support and electrical components that extend outwardly beyond the upwardly extending support and guide supports coupled at a first end to the upwardly extending support and extending outwardly beyond the electrical components. 
         [0007]    According to another aspect of the invention a preassembled power module for use in a tower is provided. This module of this aspect includes an upwardly extending support and electrical components that extend outwardly beyond the upwardly extending support. The module also includes guide supports coupled at a first end to the upwardly extending support and extending outwardly beyond the electrical components. 
         [0008]    These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which: 
           [0010]      FIG. 1  is a side view of a portion of an electrical section of a tower as it is being constructed; 
           [0011]      FIG. 2  is a cut-away top view of an electrical section of a tower according to one embodiment; and 
           [0012]      FIG. 3  is side view of an alternative embodiment of an electrical section of a tower as it being constructed. 
       
    
    
       [0013]    The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings. 
       DETAILED DESCRIPTION OF THE INVENTION 
       [0014]      FIG. 1  shows a portion of an electrical section of a tower  100  according to an embodiment of the present invention. In one embodiment, the electrical section of the tower  100  may be the tower portion of a wind turbine but is not limited to such an application. 
         [0015]    The electrical section of the tower  100  includes an inner portion  102  and an outer portion  104 . The outer portion  104  may be lowered down from above in the direction shown by arrow A to surround the inner portion  102 . As discussed above, lowering the outer portion  104  during windy conditions may prove difficult in the prior art as any sideways motion of the outer portion  104  may cause it to contact the inner portion  102 . This may lead to damage of, for example, electrical components housed by the inner portion  102 . To avoid such damage, in the prior art, a technician may have been required on each level ( 106 ,  108 ,  110 , for example) as the outer portion  104  was lowered down around the inner portion  102 . However, even with technicians present, the possibility of damage to the electrical components of the electrical tower  100  may still exist. 
         [0016]    The electrical section of the tower  100  includes, in this example, three levels  106 ,  108  and  110 . In one embodiment, some or all of these levels may be pre-assembled power modules (PPMs). Or course, any number of levels may be included and the three levels shown in  FIG. 1  are by way of example only. 
         [0017]    In one embodiment, the top level  106  is a converter level. The top level  106  may include an electrical convert unit(s)  112 . The top level  106  may also include structural elements that form the basic structure of the PPM. In this example, the top level  106  includes a horizontal support  114  that forms the base of the PPM and upwardly extending supports  116 . It should be understood that each PPM may include only one substantially centrally located upwardly extending support rather than the multiple upwardly extending supports shown in the drawings. 
         [0018]    Below the top level  106  is a middle level  108 . In one embodiment, the middle level  108  is a controller level. The middle level  108  may include a controller unit(s)  11   8 . The middle level  108  may also include structural elements that form the basic structure of the PPM. In this example, the middle level  108 , like the top level  106 , includes a horizontal support  114  that forms the base of the PPM and upwardly extending supports  116 . 
         [0019]    Below the middle level  108  is a base level  110 . In one embodiment, the base  110  is a transformer level. The bottom level  110  may include an electrical transformer unit  120 . The bottom level  110  may also include structural elements that form the basic structure of the PPM. In this example, the bottom level  110  includes a horizontal support  114  that forms the base of the PPM and upwardly extending supports  116 . 
         [0020]    The base level  110  may sit on a foundation  140 . In one embodiment, and as shown in  FIG. 1 , the foundation  140  may have attached thereto a tower foundation adapter  142  configured to provide support to the outer portion  104  when it is situated on the foundation  140 . 
         [0021]    Each level in the electrical section of the tower  100  includes guide supports  130  coupled to the upwardly extending supports  116 . These guide supports  130  extend outwardly from the upwardly extending supports  116 . In one embodiment the guide supports  130  may also extend outwardly and be connected to horizontal supports  114 . 
         [0022]    In one embodiment, the guide supports  130  extend at least beyond any electrical or other component in a particular level. In one embodiment, the guide supports  130  may extend outwardly beyond the horizontal support  114  of any particular level to which it is attached. Of course, not every level needs to include guide supports  130 . In one embodiment, only one level may include guide supports  130 . In other embodiments, two or more levels may include guide supports  130 . 
         [0023]    As shown, the guide supports  130  are coupled to and external rail  132 . The number of external rails may vary but in one embodiment, the inner portion  102  includes two external rails  132 . It shall be understood, however that external rails  132  are not required and may be replaced, for example, with wheels at the distal end of the guide supports  130 . Regardless, the rails  132  (or wheels) provide a barrier that keeps the outer portion  104  from contacting any electrical component on any level without requiring a technician. 
         [0024]      FIG. 2  is in cut-away overhead view of an electrical tower  100 . The view shown in  FIG. 2  includes an outer portion  104  that surrounds an a electrical level. In  FIG. 2 , the electrical level shown is a converter level  106 . Of course, the electrical level could be any type of level. 
         [0025]    The converter level  106  includes structural elements  202 . These structural elements  202  may be coupled to the upwardly extending supports  116  to form a PPM structure. The PPM structure may include electrical components, for example, converter units  112  coupled thereto. 
         [0026]    The converter level  106  (or any other level) may also include guide supports  130 . As shown, the guide supports  130  are coupled to the upwardly extending supports  116 . Of course, the guide supports  130  could be coupled to any portion of the PPM structure. For example, the guide supports  130  could be coupled to structural elements  202 . 
         [0027]    The guide supports  130 , in one embodiment extend outwardly from the PPM structure beyond any other portion of the PPM structure. That is, when located within an outer portion  104 , the guide supports  130  extend away from the PPM structure such that the outer portion  104  cannot contact any portion of the PPM structure or any electrical component attached thereto without first contacting a guide support. 
         [0028]    In one embodiment, and as shown in  FIG. 2 , the guide supports  130  are coupled at their distal ends to the guide rails  132 . The guide rails  132  may extend in a direction that is more vertical than horizontal. The guide rails  132  may, thus, create an external structure that surrounds the PPM. This external structure protects all portions of the PPM from contacting the outer portion  104  as it is being lowered down to surround the PPM. 
         [0029]    In one embodiment, the guide supports  130  may be removed after the outer portion  104  has been secured. Of course, in such an embodiment, the guide rails  132  may also be removed. In another embodiment, the guide supports  130 , the guide rails  132  or both may remain coupled to the PPM structure. 
         [0030]      FIG. 3  shows an alternative embodiment of an electrical section of the tower  100 . In one embodiment, the electrical section of the tower  100  may be the tower portion of a wind turbine but is not limited to such an application. 
         [0031]    The electrical section of the tower  100  includes an inner portion  102  and an outer portion  104 . The outer portion  104  may be lowered down from above in the direction shown by arrow A to surround the inner portion  102 . As discussed above, lowering the outer portion  104  during windy conditions may prove difficult in the prior art as any sideways motion of the outer portion  104  may cause is contact the inner portion  102 . This may lead to damage of, for example, electrical components housed by the inner portion  102 . 
         [0032]    As shown, the inner portion  102  includes a top layer  106 , a middle layer  108  and a bottom layer  110 . Each layer may be, for example, made from an individual PPM. 
         [0033]    Each level in the electrical section of the tower  100  includes guide supports  130  coupled to the upwardly extending supports  116 . These guide supports  130  extend outwardly from the upwardly extending supports  116 . In one embodiment the guide supports  130  may also extend outwardly and be connected to horizontal supports  114 . 
         [0034]    In one embodiment, the guide supports  130  extend at least beyond any electrical or other component in a particular level. In one embodiment, the guides may extend outwardly beyond the horizontal support  114  of any particular level to which it is attached. Of course, not every level needs to include guide supports  130 . In one embodiment, only one level may include guide supports  130 . In other embodiments, two or more levels may include guide supports  130 . 
         [0035]    In this embodiment, rather than the rails described above, each guide support  130  may include a wheel  302  attached to a distal end of the guide supports  130 . These wheels  302  may be flexible and may rotate in one embodiment. It shall be understood, that embodiments of the present invention may include some or all of the portions of the embodiments shown in  FIGS. 2 and 3 . That is, some of the guide supports  130  may be coupled to rails and others to wheels. 
         [0036]    In one embodiment, the guide supports  130  may be attached so that they may deflect from their original orientation under stresses. For example, the guide supports  130  may include a spring portion that allows for deflection of thereof In addition, the guide supports  130  may be sized such that they extend to a distance that almost touches the outer portion  104  as it is lowered towards the foundation. As such, even the presence of strong winds, the outer portion  104  may be limited in its motion and, the amount of kinetic energy it may impart to the inner portion if it comes into contact with the guide supports  130 . 
         [0037]    While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.