Patent Publication Number: US-9419394-B2

Title: Busbar connection assembly

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of and claims priority to U.S. patent application Ser. No. 14/568,963, titled “BUSBAR CONNECTION ASSEMBLY” and filed on Dec. 12, 2014, which is a continuation of and claims priority to U.S. patent application Ser. No. 13/673,060, titled “BUSBAR CONNECTION ASSEMBLY,” filed on Nov. 9, 2012. Each of these applications is incorporated by reference herein in its entirety. 
    
    
     BACKGROUND 
     A datacenter may house several computing devices, such as server computers, storage devices, and networking devices. In order to distribute electrical power for the computing devices, a power bus may be located within the datacenter. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIGS. 1A-1B  are drawings of examples of a portion of a datacenter according to various embodiments of the present disclosure. 
         FIGS. 2A-2B  are drawings of an example of a busbar connection assembly for use in the datacenter of  FIGS. 1A-1B  according to various embodiments of the present disclosure. 
         FIG. 3  is a drawing of an example of a conductive plate of the busbar connection assembly of  FIGS. 2A-2B  according to various embodiments of the present disclosure. 
         FIG. 4  is a drawing of an example of a spacer of the busbar connection assembly of  FIGS. 2A-2B  according to various embodiments of the present disclosure. 
         FIGS. 5A-5C  are a series of drawings illustrating an example of the busbar connection assembly of  FIGS. 2A-2B  being attached to a power bus in the datacenter of  FIGS. 1A-1B . 
         FIG. 6  is a drawing illustrating another example of a busbar connection assembly attached to a power bus in the datacenter of  FIGS. 1A-1B  according to various embodiments of the present disclosure. 
         FIG. 7  is a flowchart illustrating an example of an activity performed in the datacenter of  FIGS. 1A-1B  according to various embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure is directed towards a busbar connection assembly that may be used, for example, in a datacenter or in other environments where power distribution from a power bus is desired. The busbar connection assembly may facilitate maintenance, replacement, and/or repair of a device in a datacenter without having to power down computing devices that receive power via the device being maintained, repaired, and/or replace. 
     As a non-limiting example, an automatic transfer switch that routes power to computing devices in a datacenter may be brought off-line without having to power down the computing devices. To this end, the automatic transfer switch may be disconnected from utility and backup power. Additionally, connections between the automatic transfer switch and a power distribution switchboard that is fed by the automatic transfer switch may be disconnected. A battery supply may then temporarily provide power to the computing devices while the automatic transfer switch is disconnected. 
     With the automatic transfer switch disconnected from the power sources, a busbar connection assembly may be attached to a power bus within the switchboard, and the busbar connection assembly may then be connected to a backup power source, such as a generator. Thus, the backup power source may provide power to the computing devices through the busbar connection assembly while the automatic transfer switch is off-line. 
     The busbar connection assembly may comprise multiple conductive plates that are substantially parallel with respect to each other, and slots may be formed between the conductive plates. To attach the busbar connection assembly to the power bus, the conductive plates of the busbar connection assembly may insert between busbar plates for the power bus, while the busbar plates for the power bus insert into the slots in the busbar connection assembly. 
     When the automatic transfer switch is repaired or replaced and ready to be brought back online, the backup power source may be disconnected from the busbar connection assembly, and the battery supply may temporarily provide power to the computing devices. The automatic transfer switch may then be reconnected to the switchboard, and the utility and backup power may be reconnected to the automatic transfer switch. Thereafter, the automatic transfer switch routes the electrical power to the computing devices. Thus, the automatic transfer switch may be maintained, repaired, or replaced without having to power down the computing devices. In the following discussion, a general description of the system and its components is provided, followed by a discussion of the operation of the same. 
     With reference to  FIG. 1A , shown is a drawing of an example of a portion of a datacenter  100  according to various embodiments of the present disclosure. The datacenter  100  may, for example, provide data processing and data storage capabilities for various uses. For electrical power, the datacenter  100  may include, for example, a primary power source  103  and a secondary power source  106  in electrical communication with an automatic transfer switch  109 . The automatic transfer switch  109  may be in further electrical communication with a switchboard  113 , which is further coupled to a battery supply  116 . One or more load devices  119  may be electrically coupled to the battery supply  116 . 
     The primary power source  103  may be, for example, a public utility that provides electrical power. The secondary power source  106  may be a power source that is used in the event of an interruption in the primary power source  103 . As such, the secondary power source  106  may be embodied in the form of one or more electric generators powered by fuel or renewable sources, for example. 
     The automatic transfer switch  109  routes electrical power from the primary power source  103  or the secondary power source  106  to the switchboard  113  and/or possibly other devices. If the primary power source  103  is online and functioning properly, the automatic transfer switch  109  may couple the switchboard  113  to the primary power source  103 . In the event that the primary power source  103  goes off-line or is not functioning properly, the automatic transfer switch  109  may electrically couple the switchboard  113  to the secondary power source  106 . Thus, the secondary power source  106  may serve as a backup power supply for the datacenter  100  when there are issues with the primary power source  103 . 
     The switchboard  113  may function as a power distribution unit for various components in the datacenter  100 . To this end, the switchboard  113  may include one or more power buses  123  that provide power and facilitate electrical coupling between various components. According to various embodiments, a power bus  123  may include multiple busbar plates that are substantially parallel with respect to each other. The power bus  123  may comprise, for example, copper busbar plates to facilitate conducting electrical current. Example configurations of busbar plates for a power bus  123  are discussed in further detail below. 
     The battery supply  116  and potentially other components may be electrically coupled to the switchboard  113  via the power bus  123 . The battery supply  116  may provide temporary power to devices in the datacenter  100 . To this end, the battery supply  116  may be embodied in the form of an uninterruptible power supply (UPS) or other type of backup power device. 
     One or more load devices  119  may be electrically coupled to the battery supply  116 . According to various embodiments, the load devices  119  may include computing devices, such as server computers, storage devices, network switches, or any other type of device used in network communications, data processing, and/or data storage. The load devices  119  may use the battery supply  116  as a temporary backup power source in the event that the primary power source  103  and/or the secondary power source  106  are not providing power. Thus, the load devices  119  may be capable of functioning despite temporarily losing power from the primary power source  103  and/or the secondary power source  106 . In some embodiments, the battery supply  116  and one or more of the load devices  119  may be in parallel connection, instead of being in series connection as shown in  FIG. 1A . 
     Next, a general description of the operation of the various components of the datacenter  100  is provided. To begin, it is assumed that the primary power source  103  is online and providing electrical power, that the secondary power source  106  is prepared to provide power in the event that the primary power source  103  goes off-line, and that the battery supply  116  is charged to the extent that it can temporarily supply power to the load devices  119 . 
     When the primary power source  103  is online and providing power for the datacenter  100 , the automatic transfer switch  109  electrically couples the primary power source  103  to the switchboard  113 . As such, the power bus  123  is in electrical connection with the primary power source  103 , and the battery supply  116  and the load devices  119  are powered using the primary power source  103 . 
     In the event that the primary power source  103  malfunctions or goes off-line, the battery supply  116  maintains a temporary power supply for the load devices  119  until power from the secondary power source  106  is prepared to be provided to the load devices  119 . While the load devices  119  are being powered by the battery supply  116 , the automatic transfer switch  109  removes the electrical coupling from the primary power source  103  and provides electrical coupling between the switchboard  113  and the secondary power source  106 . Thus, the power bus  123  becomes electrically coupled to the secondary power source  106 . In turn, the electrical power from the secondary power source  106  is provided to the battery supply  116  and the load devices  119 . 
     Upon the primary power source  103  going back online, the automatic transfer switch  109  removes the electrical coupling between the switchboard  113  and the secondary power source  106 , and then provides electrical connection between the switchboard  113  and the primary power source  103 . During the switch, the battery supply  116  provides power to the load devices  119 . When the switch from the secondary power source  106  to the primary power source  103  has completed, the primary power source  103  is connected via the automatic transfer switch  109  to the switchboard  113  and thus the power bus  123 . As such, the battery supply  116  and the load devices  119  are then powered by the primary power source  103 . 
     As can be appreciated by a person having ordinary skill in the art, various devices in the datacenter  100  may require maintenance, repair, and/or replacement from time to time. In order to accomplish this maintenance, repair, and/or replacement, some of these devices may need to be removed from their respective power sources for safety or other considerations. As a non-limiting example, the automatic transfer switch  109  may experience a failure that requires disconnecting the primary power source  103  and the secondary power source  106  in order to accomplish the replacement and/or repair of the automatic transfer switch  109 . With the primary power source  103  and the secondary power source  106  disconnected from the automatic transfer switch  109 , the battery supply  116  may supply a backup power to the load devices  119 . However, because the battery supply  116  has a limited storage capacity, the time for which the battery supply  116  is capable of powering the load devices  119  is limited. It may be the case that the time it takes to repair or replace the automatic transfer switch  109  exceeds the time for which the battery supply  116  is capable of powering the load devices  119 . 
     In accordance with the present disclosure, a backup power source, such as the secondary power source  106 , may be temporarily coupled directly to the power bus  123  to provide power for the load devices  119 , as will now be described. Turning to  FIG. 1B , shown is the datacenter  100  after the power connections between the automatic transfer switch  109  and other components in the datacenter  100  have been removed. In addition, the secondary power source  106  has been routed to the power bus  123  in the switchboard  113 . A busbar connection assembly  200  ( FIGS. 2A-2B ) may be used, for example, to electrically couple the secondary power source  106  to the power bus  123 . It is understood that in alternative embodiments, a different type of backup power source, such as a roll-up generator or other type of power source, may be connected directly to the power bus  123 , instead of the secondary power source  106 . 
     As shown, the automatic transfer switch  109  is isolated from the primary power source  103 , the secondary power source  106 , and the power bus  123  for the datacenter  100 . After the automatic transfer switch  109  is disconnected from the primary power source  103  and the secondary power source  106 , and before the secondary power source  106  is connected directly to the power bus  123 , the load devices  119  may be temporarily powered using the battery supply  116 . Upon the secondary power source  106  being coupled directly to the power bus  123 , the load devices  119  may be powered by the secondary power source  106 , and the battery supply  116  may recharge. As such, the load devices  119  may continue to be powered by the secondary power source  106  and/or the battery supply  116  while the automatic transfer switch  109  is disconnected from the system. 
     When the automatic transfer switch  109  is repaired or replaced and ready to be powered by the primary power source  103  and/or the secondary power source  106 , the direct connection from the secondary power source  106  and the power bus  123  may be removed. In embodiments where a busbar connection assembly  200  is used, the busbar connection assembly  200  may remain connected to the power bus  123 , and a cable between the busbar connection assembly  200  and the secondary power source  106  may be disconnected. In such a case, the busbar connection assembly  200  may remain coupled to the power bus  123  indefinitely. 
     Upon the secondary power source  106  being disconnected from the power bus  123 , the battery supply  116  may provide temporary power for the load devices  119 . While the battery supply  116  is powering the load devices  119 , the primary power source  103  and the secondary power source  106  may be reconnected to the automatic transfer switch  109 , and the automatic transfer switch  109  may be reconnected to the power bus  123  in the switchboard  113 . Thus, the automatic transfer switch  109  may be removed from power and repaired or replaced without the datacenter  100  losing the functionality of the load devices  119 . 
     Turning now to  FIGS. 2A-2B , shown are drawings of an example of a busbar connection assembly  200  that may be used in the datacenter  100  ( FIG. 1 ) according to various embodiments of the present disclosure. More specifically, the busbar connection assembly  200  may serve, for example, as an electrical coupling between the power bus  123  ( FIGS. 1A-1B ) and the secondary power source  106  ( FIGS. 1A-1B ) or between any other devices.  FIG. 2A  shows a perspective view of the busbar connection assembly  200 , and  FIG. 2B  shows a top view of the busbar connection assembly  200  according to various embodiments. 
     The busbar connection assembly  200  may comprise multiple conductive plates  203 , multiple spacers  206 , multiple slots  209 , one or more first fasteners  213 , one or more second fasteners  216 , one or more power cables  219 , and potentially other features and/or components. The conductive plates  203 , the spacers  206 , the power cables  219 , the first fasteners  213 , and/or the second fastener  216  may comprise, for example, copper or any other electrically conductive material. 
     As shown, the conductive plates  203  may be substantially parallel with respect to each other. Similarly, the spacers  206  may be substantially parallel with respect to each other and with respect to the conductive plates  203 . Each spacer  206  may be located between a pair of the conductive plates  203 . Further, each of the slots  209  may be located between a pair the conductive plates  203 , and each of the spacers  206  may be located at an end of each of the slots  209 . 
     Each of the slots  209  may be configured to provide space for one or more busbar plates of the power bus  123  ( FIG. 1 ), and each of the conductive plates  203  may be configured to insert between a pair of busbar plates of the power bus  123 . Additionally, one or more of the conductive plates  203  may include a tapered edge  223  that may facilitate insertion of the conductive plate  203  between the busbar plates of the power bus  123 . The tapered edge  223  may also facilitate the busbar plates being inserted in the slots  209  between the conductive plates  203 . 
     The one or more first fasteners  213  may insert through the conductive plates  203  and the spacers  206 . The first fasteners  213 , for example, may be threaded into nuts  226  and tightened to maintain the conductive plates  203  and the spacers  206  being in alignment and close proximity as shown in  FIGS. 2A-2B . According to various embodiments, conductive or non-conductive epoxies, glues, or other materials may be used to maintain the conductive plates  203  being in close proximity to the spacers  206 . 
     The one or more power cables  219  may be used to electrically connect the conductive plates  203  and/or the spacers  206  to a power source, such as the secondary power source  106  ( FIGS. 1A-1B ), or another component. Camlocks, “quick connectors,” pigtail connectors, or any other type of component may be used to connect the power cables  219  to the first fasteners  213  or any other conductive element of the busbar connection assembly  200 . Although the present example shows a pair of power cables  219  connected to the first fasteners  213 , fewer or more power cables  219  may be used according to various embodiments. For example, the quantity of the power cables  219  used may be based at least in part on the expected amount of current to flow through the busbar connection assembly  200 . 
     The second fastener  216  may insert through the conductive plates  203  and screw into a nut  229  or another type of component. By tightening the second fastener  216  and the nut  229 , one or more of the conductive plates  203  clamp on and press against one or more of the busbar plates of the power bus  123 . In alternative embodiments, a clamp, such as a C-clamp, or other type of apparatus may be used to clamp one or more of the conductive plates  203  against one or more of the busbars for the power bus  123 . The conductive plates  203  may clamp on one or more of the busbar plates by, for example, the conductive plates  203  flexing or pivoting about the spacers  206 . 
     In the embodiment shown, the busbar connection assembly  200  is configured so that when the busbar connection assembly  200  is attached to the power bus  123 , the busbar plates are located in the slots  209  between the second fastener  216  and the spacers  206 . However, in alternative embodiments, the busbar connection assembly  200  may be configured to so that when the busbar connection assembly  200  is attached to the power bus  123 , the second fastener  216  is located between the busbar plates and the spacers  206 . 
     Although the present embodiment shows the spacers  206  being separate components from the conductive plates  203 , in alternative embodiments one or more of these components may be unitary. For instance, a block of copper or another material may be milled in order to form the slots  209 , the conductive plates  203 , the connectors, and/or other features of the busbar connection assembly  200 . 
     Turning now to  FIG. 3 , shown is an example of one of the conductive plates  203  in the busbar connection assembly  200  ( FIGS. 2A-2B ) according to various embodiments of the present disclosure. The conductive plate  203  may be, for example, rectangular or any other shape and may comprise copper or another type of material that conducts electricity. In some embodiments, the conductive plate  203  may have a tapered edge  223  that may facilitate insertion of the conductive plate  203  between busbar plates of the power bus  123  ( FIGS. 1A-1B ). 
     Additionally, the conductive plate  203  may include one or more first holes  306  through which the first fasteners  213  ( FIGS. 2A-2B ) insert and one or more second holes  309  through which the one or more second fasteners  216  ( FIGS. 2A-2B ) insert. Because it may be difficult for the second fastener  216  to access the second hole  309  when the busbar connection assembly  200  is attached to the power bus  123 , the second hole  309  may be larger than the first holes  306  to facilitate the second fastener  216  being inserted into the second hole  309 . A washer or an enlarged head on the second fastener  216 , for example, may prevent the second fastener  216  from falling through the second hole  309  of the busbar connection assembly  200 . 
     Turning to  FIG. 4 , shown is an example of one of the spacers  206  in the busbar connection assembly  200  ( FIGS. 2A-2B ) according to various embodiments of the present disclosure. The spacer  206  may be rectangular or any other shape. Additionally, at least a portion of the spacer  205  may comprise copper or any other type of material that conducts electricity. According to various embodiments, the spacer  206  may or may not comprise electrically conductive materials. In some embodiments, the spacer  206  may comprise a compressible material, such as rubber, that facilitates the conductive plates  203  ( FIGS. 2A-2B ) flexing and/or pivoting to clamp to the busbar plates of the power bus  123 . 
     The spacer  206  may also include one or more holes  403  through which the first fasteners  213  ( FIGS. 2A-2B ) may insert. In addition, the spacer  206  may include one or more holes  403  through which the first fasteners  213  ( FIGS. 2A-2B ) insert. In embodiments where the spacer  206  comprises a non-conductive material, the spacer  206  may also have conductive portions to facilitate current flowing through the busbar connection assembly  200 . For instance, conductive rings may form the holes  403 , and a compressible rubber may surround the outer circumference of the conductive rings. 
     With reference now to  FIG. 5A , shown is an example of the busbar connection assembly  200  prepared to be attached to a power bus  123 . As previously mentioned, the power bus  123  may route power through the datacenter  100  ( FIGS. 1A-1B ). To this end, the power bus  123  in the present example includes multiple conductive busbar plates  500  that are substantially parallel with respect to each other. In addition, spacings  503  may be located between the busbar plates  500 . 
     As shown, the busbar connection assembly  200  is assembled so that the power cables  219  are electrically connected to the conductive plates  203  and the spacers  206 . Additionally, the second fastener  216  ( FIGS. 2A-2B ) is removed from the busbar connection assembly  200  so that the busbar plates  500  may be inserted into the slots  209  of the busbar connection assembly  200  and so that the conductive plates  203  may be inserted into the spacings  503  between the busbar plates  500 . In addition, the busbar connection assembly  200  is oriented so that the slots  209  are aligned with the busbar plates  500  and so that a plurality of the conductive plates  203  are aligned with the spacings  503  between the busbar plates  500 . 
     Referring now to  FIG. 5B , shown is an example of the busbar connection assembly  200  after a plurality of the busbar plates  500  have been inserted into the slots  209  in the busbar connection assembly  200 . As shown, a plurality of the conductive plates  203  have also been simultaneously inserted into the spacing  503  located between the busbar plates  500 . In some embodiments, the friction between the conductive plates  203  and the busbar plates  500  may be to the extent that an object, such as a mallet or hammer, may be used to hammer the busbar connection assembly  200  in order for the conductive plates  203  to arrive in the position shown in  FIG. 5B  with respect to the busbar plates  500 . 
     Turning to  FIG. 5C , shown is an example of the busbar connection assembly  200  after the second fastener  216  has been inserted into the conductive plates  203  and threaded into the nut  229  ( FIG. 2A ). As previously mentioned the second hole  309  ( FIG. 3 ) in the conductive plates  203  may be larger than the first holes  306 . To prevent the head of the second fastener  216  from sliding all the way through the conductive plates  203 , the second fastener  216  may insert into a washer  506  that has an outer diameter greater than the second hole  309 , and the washer  506  may be sandwiched between the head of the second fastener  216  and the outermost conductive plate  203 . The second fastener  216  may be threaded into the nut  229  and tightened such that the second fastener  216  in conjunction with the nut  226  forces the outermost conductive plates  203  to flex and/or pivot towards the inner conductive plates  203 . Thus, the outermost conductive plates  203  can clamp down on and press against one or more of the busbar plates  500  to thereby restrict removal of the busbar connection assembly  200  from the power bus  123 . 
     In the embodiment shown, the busbar plates  500  are located in the slots  209  between the second fastener  216  and the spacers  206 . Because the second fastener  216  extends through the conductive plates  203 , the second fastener  216  may act as a stop and thereby further prevent removal of the busbar connection assembly  200  from the power bus  123 . In order to remove the busbar connection assembly  200 , the second fastener  216  may be unscrewed from the nut  229 , and the second fastener  216  may be removed from the conductive plates  203 . Thereafter, the busbar connection assembly  200  may be pulled away from the power bus  123 . 
     With reference now to  FIG. 6 , shown is another example of a busbar connection assembly  200  for use in, for example, the datacenter  100  ( FIGS. 1A-1B ) according to various embodiments of the present disclosure. In particular, shown is an example of the busbar connection assembly  200  after the second fastener  216  has been inserted into the conductive plates  203  and threaded into the nut  229  ( FIG. 2A ). In the embodiment shown, the second fastener  216  and the second hole  309  ( FIG. 3 ) are located so that when the busbar connection assembly  200  is attached to the power bus  123 , the second fastener  216  is located between the busbar plates  500  and the spacers  206 . The second fastener  216  and the nut  229  ( FIG. 2A ) may be tightened, causing the outermost conductive plates  203  to flex and/or pivot about the spacers  206 . As a result, the outermost conductive plates  203  may clamp down on and press against the busbar plates  500 , thereby restricting removal of the busbar connection assembly  200  from the power bus  123 . 
     In order to remove the busbar connection assembly  200 , the second fastener  216  may be loosened or removed. Thereafter, the busbar connection assembly  200  may be forced away from the busbar plates  500 . 
     Referring now to  FIG. 7 , shown is a flowchart that illustrates an example of an activity performed in the datacenter  100  ( FIGS. 1A-1B ) according to various embodiments of the present disclosure. Specifically, the flowchart of  FIG. 7  provides an example of a device, such as an automatic transfer switch  109 , in the datacenter  100  ( FIGS. 1A-1B ) being disconnected form the primary power source  103  ( FIGS. 1A-1B ) and the secondary power source  106  ( FIGS. 1A-1B ), the busbar connection assembly  200  ( FIGS. 2A-2B ) being used to provide electrical power to the load devices  119  ( FIGS. 1A-1B ), and the device being reconnected to the primary power source  103  and the secondary power source  106 . 
     Beginning with box  703 , the device in the datacenter  100  is removed from the primary power source  103 . The device being removed from the primary power source  103  may be, for example the automatic transfer switch  109  or any other device in the datacenter  100  that is being disconnected from power for various reasons. As shown in box  706 , the device is also disconnected from the secondary power source  106 . At this time, the battery supply  116  may provide backup power for the load devices  119 . 
     Next, the connections between the device and the power bus  123  ( FIGS. 1A-1B ) in the switchboard  113  ( FIGS. 1A-1B ) are removed, as shown in box  709 . At this point, the device is electrically isolated from the power sources and the power bus  123 . 
     In box  713 , the busbar connection assembly  200  ( FIGS. 2A-2B ) is electrical coupled to the power bus  123 . Coupling the busbar connection assembly  200  to the power bus  123  may involve inserting one or more of the conductive plates  203  ( FIGS. 2A-2B ) of the busbar connection assembly  200  between the busbar plates  500  ( FIGS. 5A-5C ) and simultaneously inserting one or more of the busbar plates  500  in the slots  209  ( FIG. 2A ) in the busbar connection assembly  200 . As shown in box  716 , the busbar connection assembly  200  is then electrically coupled to a backup power source. According to various embodiments, the backup power source may be the secondary power source  106 , a roll-up generator, or any other type of power source. Additionally, in some embodiments, the primary power source  103  may instead be connected to the busbar connection assembly  200 . 
     In box  719 , backup power is then provided to the load devices  119  ( FIGS. 1A-1B ) using the backup power source via the busbar connection assembly  200 . While the load devices  119  are being powered by the backup power source, the powered-down device (e.g., the automatic transfer switch  109 ) may be maintained, repaired, and/or replaced, as shown in box  723 . Additionally, at this time the battery supply  116  may power the load devices  119 , so that the datacenter  100  does not lose the computing and/or storage capabilities of the load devices  119 . 
     When the device is ready to be reconnected to the primary power source  103  and/or secondary power source  106 , the backup power source may be disconnected from the busbar connection assembly  200 , as shown in box  726 . For example, one or more power cables  219  ( FIGS. 2A-2B ) that connect the backup power source and the busbar connection assembly  200  may be disconnected, while the busbar connection assembly  200  remains attached to the power bus  123 . In alternative embodiments, the busbar connection assembly  200  may be removed from the power bus  123 . For the embodiments in which the busbar connection assembly  200  remains attached to the power bus  123 , the busbar connection assembly  200  may serve as a connection point for future usage. 
     Moving to box  729 , the primary power source  103  and the secondary power source  106  are coupled to device. Next, as depicted in box  733 , the primary power source  103  and/or the secondary power source  106  provide power to the device, such as the automatic transfer switch  109 , which may route the power to the load devices  119 . At this time, the battery supply  116  may stop powering the load devices  119  and begin to recharge. Thereafter, the process ends. 
     The flowchart of  FIG. 7  shows an example of activity performed in the datacenter  100 . Although the flowchart of  FIG. 7  shows a specific order of performance, it is understood that the order of performance may differ from that which is depicted. For example, the order of performance of two or more blocks may be scrambled relative to the order shown. Also, two or more blocks shown in succession in  FIG. 7  may be performed concurrently or with partial concurrence. Further, in some embodiments, one or more of the boxes shown in  FIG. 7  may be skipped or omitted. It is understood that all such variations are within the scope of the present disclosure. 
     It is emphasized that the above-described embodiments of the present disclosure are merely possible examples of implementations to set forth for a clear understanding of the principles of the disclosure. Many variations and modifications may be made to the above-described embodiments without departing substantially from the spirit and principles of the disclosure. All such modifications and variations are intended to be included herein within the scope of this disclosure and protected by the following claims.