US20110140686A1 - Thermal extension structures for monitoring bus bar terminations - Google Patents
Thermal extension structures for monitoring bus bar terminations Download PDFInfo
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- US20110140686A1 US20110140686A1 US12/775,954 US77595410A US2011140686A1 US 20110140686 A1 US20110140686 A1 US 20110140686A1 US 77595410 A US77595410 A US 77595410A US 2011140686 A1 US2011140686 A1 US 2011140686A1
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- Prior art keywords
- projection element
- thermal
- bus bars
- thermal extension
- extension structure
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
Definitions
- This application is directed, in general, to electrical systems and, more specifically, to a thermal extension of the system, and, methods of using the thermal extension to monitor bus bar terminations of the system.
- the system comprises an equipment enclosure configured to hold one or more DC power bus bars therein.
- the system also comprises one or more thermal extension structures, each thermal extension structure connected to one or more of the bus bars.
- Each thermal extension structure has a projection element whose thermal state reflects an electrical connectivity of the one or more bus bars that the thermal extension structure is connected to. The projection element is viewable from a location outside of the equipment enclosure.
- Another embodiment provides a method of measuring the electrical connectivity of the one or more DC power bus bars of the above-described electrical system.
- the method comprises passing a direct current through at least one of the bus bars and measuring the thermal state of the projection element.
- FIG. 1 shows a perspective view of an example embodiment of an electrical system of the disclosure
- FIG. 2 shows a plan view of the example system of FIG. 1 through view line 2 - 2 in FIG. 1 ;
- FIG. 3 a presents a cross-sectional view of an example system corresponding to view 3 a - 3 a in FIG. 2 ;
- FIG. 3 b presents a cross-sectional view of an example system corresponding to view 3 b - 3 b in FIG. 2 ;
- FIG. 4 presents a flow diagram of an example embodiment of a method measuring the electrical connectivity of a bus bar of an electrical system of the disclosure, such as any of the example systems depicted in FIGS. 1-3 b.
- DC distribution and installation practices can use multiple DC bus bars held inside of an enclosing structure.
- the bus bars can be interconnected to each other, or to other electrical components (e.g., server equipment) of the electrical system, using terminations.
- the terminations can loosen and thereby negatively impact the reliable delivery of DC power distribution by compromising the electrical connectivity of the bus bars to other bus bars or electrical components of the system. Therefore, to ensure the reliable delivery of power through the bus bars, it is desirable to periodically inspect the terminations and refasten the termination if the termination has loosened.
- FIG. 1 shows a perspective view of an example embodiment of the electrical system 100 .
- FIG. 2 shows a plan view of the system 100 through view line 2 - 2 in FIG. 1 .
- FIG. 3 a presents a cross-sectional view of an example system corresponding to view 3 a - 3 a in FIG. 2 and
- FIG. 3 b presents a cross-sectional view of an example system corresponding to view 3 b - 3 b in FIG. 2 .
- the electrical system 100 is a power distribution system.
- the electrical system could be, or include, other electrical systems that have bus bars and terminations, which can loosen, and thereby compromise the electrical connectivity of the bus bar.
- the system 100 comprises an equipment enclosure 105 configured to hold one or more DC power bus bars 110 therein.
- the system 100 also comprises one or more thermal extension structure 115 , each being connected to one of the bus bars 110 .
- Each of the thermal extension structures 115 have a projection element 117 whose thermal state reflects an electrical connectivity of the bus bars 110 that the thermal extension structure 115 is connected to.
- the projection element 117 is viewable from a location 120 outside of the equipment enclosure 105 ,
- the equipment enclosure 105 can be, or include, a cabinet 122 and/or power distribution platform 124 .
- the equipment enclosure 105 can include a platform 124 and at least one cabinet 122 , the platform 124 being coupled to an end of the cabinet 122 .
- the platform 124 can hold the DC power bus bars 110 and thermal extension structures 115 therein.
- the cabinet 122 can hold electronic component modules 126 that are electrically coupled to the bus bars 110 via feed connections 127 (e.g., wires).
- the platform 124 can further include other structures such as receptacles 128 for over-current current protection devices 130 , power tap bus bars 132 , and electrical connection bus bars 134 , spacer bus bars 305 ( FIGS. 3 a and 3 b ) and cabinet connection contacts 136 .
- the DC power bus bar 110 can be composed of any electrically conductive material and configured to have physical dimensions that preferably is suitable for carrying high direct currents (e.g., 80 Amps or greater in some cases). Individual bus bars 110 can be configured to deliver a direct current to at least one electronic component module 126 (e.g., telecommunication server equipment), over-current current protection devices 130 , power tap bus bars 132 or electrical connection bus bars 134 of the system 100 , or, to transfer the direct current to another DC power bus bar 110 of the system 100 .
- electronic component module 126 e.g., telecommunication server equipment
- over-current current protection devices 130 e.g., power tap bus bars 132 or electrical connection bus bars 134 of the system 100
- transfer the direct current to another DC power bus bar 110 of the system 100 e.g., to transfer the direct current to another DC power bus bar 110 of the system 100 .
- the location 120 outside of the equipment enclosure 105 can be a pre-designated monitoring site, such as an equipment aisle, situated outside of an outer perimeter 210 of the equipment enclosure 105 (e.g., the outer surfaces of the cabinet and/or platform).
- the location 120 can be adjacent to an opening 140 in the equipment enclosure 105 that allows an unobstructed view of the projection element 117 .
- the location 120 is situated such that the enclosure perimeter 210 does not need to be breached in order for the projection element 117 to be viewed.
- a covering, door or wall panel of the equipment enclosure 105 can be opened or removed to provide the opening 140 through which the view of the projection element 117 from the location 120 is attained.
- termination 145 refers to any connecting structure that can attach the bus bar 110 to another bus bar or the other above-mentioned components of the system 100 .
- Examples of terminations 145 include threaded fasteners such as bolt or threaded rod, and in some cases, includes a capping structure, such as a nut that screws onto the bolt or rod.
- Other types of terminations 145 that could be used would be apparent to one skilled in the art based upon the present disclosure.
- the thermal extension structure 115 is connected to a termination 145 of one or more the bus bars 110 (e.g., a stack of bus bars 110 ).
- connecting the thermal extension structure 115 directly to the termination 145 can advantageously provide a more sensitive indicator of a temperature change in the termination 145 than provided by a indirect connection.
- the thermal extension structure 115 is connected to another electrical component of the system 100 that in turn is connected to the termination 145 , and, the thermal extension structure 115 is located in a vicinity of the termination 145 .
- the thermal extension structure can be connected to a power tap bus bar 132 of the system 100 .
- the power tap bus bar 132 in turn can be connected to a termination 145 that is connected to one or more of the DC power bus bars 110 .
- thermal extension structure 115 directly to the other electrical component (e.g., power tap bus bar 132 ) instead of directly to the termination 145 can be advantageous in situations where the projection element 117 would not otherwise be viewable from one of the locations 120 , or, where there is insufficient space available in the enclosure 105 to accommodate a direct connection to the termination 145 .
- the other electrical component e.g., power tap bus bar 132
- the distance 220 separating the thermal extension structure 115 from the termination 145 can depend on a number of system-specific factors, such as the magnitude of temperature change in the termination 145 when loose, the heat transfer coefficients of the bus bar 110 , the thermal extension structure 115 , the termination 145 and the other electrical component, and, the sensitivity of heat measuring equipment (e.g., a heat imaging devices) deployed to monitor temperature changes in the projection element 117 .
- the thermal extension structure 115 can be separated from the termination 145 on the bus bar 110 by a distance 220 ( FIG. 2 ) in a range from about 0.1 to 1 foot.
- the thermal extension structure 115 can be a continuous part of one of the DC power bus bars 110 .
- one or more of the bus bars 110 can be formed, e.g., via a molding or machining step, so as to have a thermal extension structure that is an integral part of the material that the bar 110 is composed of.
- an end of one or more bus bar 110 can be formed to have an extension portion that corresponds to the thermal extension 115 .
- a bolt termination 145 can pass through an opening 315 of a mounting element 150 and through a termination hole 320 of at least one of the DC power bus bars 110 to thereby connect the thermal extension structure 115 to the bus bar 110 .
- the mounting element 150 can be configured as a rectangular plate, a washer or washer lock with an extension structure that corresponds to the projection element 117 .
- the mounting element 150 include clamps such as spring-loaded or screw-tightened clamps.
- the mounting element 150 can be or include a clamp that attaches, e.g., to the power tap bus bar 132 .
- Still other embodiments of the mounting element 150 would be apparent to one skilled in the art based upon the present disclosure.
- the projection element 117 extends to an outside surface 155 of the equipment enclosure 105 .
- the projection element 117 can be configured as a rod that extends from the mounting element 150 to the outside surface 155 of the platform 124 such that an end 330 of the mounting element 150 is substantially parallel with the outside surface 155 .
- the outside surface 155 of the equipment enclosure 105 can further includes an opening 335 through which the projection element's end 330 can extend to.
- the projection element 117 can be located inside of the equipment enclosure 105 .
- the outside surface 155 of the equipment enclosure 105 can again include an opening 337 through which a surface 340 of the projection element 117 can be viewed.
- the projection element 117 can be configured such that the surface 340 of the element 117 is viewable from the location 120 outside of the equipment enclosure 105 .
- the projection element 117 can have an oblique or perpendicular angle 345 with respect to a surface 350 of the component (e.g., a power tap bus bar 132 in FIG. 3 a , or a bus bar 110 ) that the thermal extension structure 115 is connected to.
- the thermal state of the projection element 117 is signified by a temperature of the projection element 117 .
- the termination 145 heats up and heat is transferred to the connected thermal extension structure 115 , resulting in a temperature increase of the projection element 117 , thereby signifying a change in thermal state.
- the absolute temperature, or, a change in temperature, of the projection element 117 could be used as the thermal state indicator that, in turn, is indicative of a loss in the electrical connectivity of the DC power bus bar 110 to which the loose termination 145 is connected to.
- the thermal state can be signified by a relative temperature of one projection element 117 (e.g., the projection element 117 shown in FIG.
- thermal extension structure 115 that is connected to a first bus bar 110 will have a different thermal state (e.g., higher temperature) than the thermal extension structure 115 that is connected to a second bus bar 110 .
- the thermal state of the projection element 117 can be measured in a number of different fashions.
- the system 100 further includes including a heat imaging device 225 to provide a rapid and non-contact indicator of the thermal state of the element 117 .
- a heat imaging device 225 can help avoid electrocution hazards in cases where, e.g., the thermal extension 115 is electrically conductive and un-insulated.
- suitable heat imaging devices 225 include thermal imaging goggles or thermal imaging cameras.
- Some embodiments of the heat imaging device 225 can be configured to detect, and present in a heat image, the thermal state of the projection element 117 .
- the thermal state of the projection element 117 can be presented as thermal image that highlights an elevated temperature, or changes in temperature, of a projection element 117 connected to a DC power bus bar 110 that has non-optimal electrical connectivity, e.g., due to a loose termination 145 .
- the system 100 can further include a non-contact infrared thermometer 230 such as a laser-guided infrared thermometer.
- a non-contact thermometer 230 can also help avoid electrocution hazards in cases similar to the heat imaging devices 225 .
- the use of a non-contact thermometer 230 can also facilitate assessing the thermal state of the protection element 117 in cases where the element 117 is located deep inside of the enclosure 105 (e.g., such as shown in FIG. 3 a ).
- the thermal state of the projection element 117 could be assessed using a contact temperature sensor, such as a resistance thermometer, or simply an inspector's finger to feel the heat or estimate the temperature of the element 117 in cases where the projection element 117 extends to the enclosure's outside surface 155 .
- a contact temperature sensor such as a resistance thermometer
- the thermal extension 115 can be composed of a material that is thermally conductive and electrically insulating. Having the thermal extension 115 composed of such material can help avoid electrocution hazards, e.g., when the projection element 117 extends to the enclosure's outside surface 155 .
- examples of such materials include ceramic material such as silica or electrically conductive heat conductors (e.g., metal particles) embedded in an insulating matrix such as rubbers or non-conducting plastics (e.g., polyester or polyvinyl plastics).
- the entire thermal extension 115 can be composed of the thermally conductive and electrically insulating material.
- the projection element 117 is composed of the thermally conductive and electrically insulating material.
- the thermal extension structure 115 can include an electrically conductive metal core (e.g., aluminum) that is coated with an electrically insulating layer such as a rubber or non-conducting plastics, paint or tape layer.
- Another embodiment of the disclosure is a method of measuring the electrical connectivity of a DC power bus bar 110 of the electrical system 100 .
- the method can be performed on any of the systems 100 and use any of the components discussed in the context of FIGS. 1-3 herein.
- FIG. 4 presents a flow diagram of an example embodiment of selected steps in the method 400 of measuring the DC power bus bar's 110 electrical connectivity.
- the method 400 comprises a step 405 of passing a direct current (e.g., 80 Amps or higher) through the DC power bus bar 110 , and, a step 410 of measuring the thermal state of the projection element 117 .
- a direct current e.g. 80 Amps or higher
- Some preferred embodiments of measuring the thermal state in step 410 can include a step 415 of measuring black-body radiation emitted by the projection element 117 .
- the heat imaging device 225 or non-contact infrared thermometer 230 can be used to measure infrared radiation emitted by the projection element 117 as part of step 415 .
- Some embodiments of the method 400 further include a step 420 comparing the thermal state of the projection element 117 to a database to determine if the desired direct current is reliably passing through the bus bar 110 .
- the database can include a collection of multiple measurements of a target direct current through the DC power bus bar 110 and a average or range of temperatures (or proxy for temperature) for the projection element 117 , e.g., over a period of known normal operation of the system 100 .
- the method 400 can include an alerting step 425 when an un-acceptable direct current is passing through the bus bar 110 , if, in decision step 430 , the thermal state is determined to be outside of an accepted thermal range (e.g., a measure temperature or temperature proxy exceed the average, or range, of a target temperature) provided by the database.
- an accepted thermal range e.g., a measure temperature or temperature proxy exceed the average, or range, of a target temperature
Abstract
Description
- This application claims the benefit of U.S. Provisional Application Ser. No. 61/308,215, filed on Feb. 25, 2010, to Edward C. Fontana, et al. entitled, “POWER DISTRIBUTION PLATFORM;” Provisional Application Ser. No. 61/287,322, filed on Dec. 17, 2009, to Roy Davis, et al. entitled, “HYBRID ARCHITECTURE FOR DC POWER PLANTS;” and Provisional Application Ser. No. 61/287,057, to filed on Dec. 16, 2009 to Edward C. Fontana, et al. entitled, “A FLOOR MOUNTED DC POWER DISTRIBUTION SYSTEM,” which are all commonly assigned with this application and incorporated herein by reference in their entirety.
- This application is directed, in general, to electrical systems and, more specifically, to a thermal extension of the system, and, methods of using the thermal extension to monitor bus bar terminations of the system.
- This section introduces aspects that may be helpful to facilitating a better understanding of the inventions. Accordingly, the statements of this section are to be read in this light. The statements of this section are not to be understood as admissions about what is in the prior art or what is not in the prior art.
- Telecommunication sites are evolving into large data centers, making extensive use of many similar configurations of server equipment. The Green Grid consortium has suggested that 48VDC is the most efficient and cost effective way to power such equipment, and, provide the highest availability and reliability of reserve power in case of utility grid failure.
- There is a long-felt need to more efficiently install and distribute reliable DC power to server equipment at reduced labor and material costs.
- One embodiment provides an electrical system. The system comprises an equipment enclosure configured to hold one or more DC power bus bars therein. The system also comprises one or more thermal extension structures, each thermal extension structure connected to one or more of the bus bars. Each thermal extension structure has a projection element whose thermal state reflects an electrical connectivity of the one or more bus bars that the thermal extension structure is connected to. The projection element is viewable from a location outside of the equipment enclosure.
- Another embodiment provides a method of measuring the electrical connectivity of the one or more DC power bus bars of the above-described electrical system. The method comprises passing a direct current through at least one of the bus bars and measuring the thermal state of the projection element.
- Embodiments of the disclosure are better understood from the following detailed description, when read with the accompanying FIGUREs. Corresponding or like numbers or characters indicate corresponding or like structures. Various features may not be drawn to scale and may be arbitrarily increased or reduced in size for clarity of discussion. Reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
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FIG. 1 shows a perspective view of an example embodiment of an electrical system of the disclosure; -
FIG. 2 shows a plan view of the example system ofFIG. 1 through view line 2-2 inFIG. 1 ; -
FIG. 3 a presents a cross-sectional view of an example system corresponding to view 3 a-3 a inFIG. 2 ; -
FIG. 3 b presents a cross-sectional view of an example system corresponding to view 3 b-3 b inFIG. 2 ; and -
FIG. 4 presents a flow diagram of an example embodiment of a method measuring the electrical connectivity of a bus bar of an electrical system of the disclosure, such as any of the example systems depicted inFIGS. 1-3 b. - The following merely illustrate principles of the invention. Those skilled in the art will appreciate the ability to devise various arrangements which, although not explicitly described or shown herein, embody the principles of the invention and are included within its scope. Furthermore, all examples and conditional language recited herein are principally intended expressly to be only for pedagogical purposes to aid in understanding the principles of the invention and the concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to specifically disclosed embodiments and conditions. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass equivalents thereof. Additionally, the term, “or,” as used herein, refers to a non-exclusive or, unless otherwise indicated. Also, the various embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments.
- DC distribution and installation practices can use multiple DC bus bars held inside of an enclosing structure. The bus bars can be interconnected to each other, or to other electrical components (e.g., server equipment) of the electrical system, using terminations. The terminations, however, can loosen and thereby negatively impact the reliable delivery of DC power distribution by compromising the electrical connectivity of the bus bars to other bus bars or electrical components of the system. Therefore, to ensure the reliable delivery of power through the bus bars, it is desirable to periodically inspect the terminations and refasten the termination if the termination has loosened.
- When a bus bar is powered, terminations that work loose produce heat, and this heat can be identified using thermal imaging technology deployed outside of the enclosure. However, assembly and electrical connectivity efficiency constraints may not allow the actual termination to be viewable from outside of the enclosure. This, in turn, can increase the labor costs for performing the appropriate inspection and maintenance of the terminations and bus bars. As part of the present disclosure, it was discovered that thermal extensions can be fastened to bus bars such that the thermal state of the bus bar, and hence its electrical connectivity, can be more readily assessed from outside of the enclosure.
- One embodiment of the disclosure is an electrical system.
FIG. 1 shows a perspective view of an example embodiment of theelectrical system 100.FIG. 2 shows a plan view of thesystem 100 through view line 2-2 inFIG. 1 .FIG. 3 a presents a cross-sectional view of an example system corresponding to view 3 a-3 a inFIG. 2 andFIG. 3 b presents a cross-sectional view of an example system corresponding to view 3 b-3 b inFIG. 2 . - In some preferred embodiments, the
electrical system 100 is a power distribution system. However, the electrical system could be, or include, other electrical systems that have bus bars and terminations, which can loosen, and thereby compromise the electrical connectivity of the bus bar. - The
system 100 comprises anequipment enclosure 105 configured to hold one or more DCpower bus bars 110 therein. Thesystem 100 also comprises one or morethermal extension structure 115, each being connected to one of thebus bars 110. Each of thethermal extension structures 115 have aprojection element 117 whose thermal state reflects an electrical connectivity of thebus bars 110 that thethermal extension structure 115 is connected to. Theprojection element 117 is viewable from alocation 120 outside of theequipment enclosure 105, - The
equipment enclosure 105 can be, or include, acabinet 122 and/orpower distribution platform 124. For example, theequipment enclosure 105 can include aplatform 124 and at least onecabinet 122, theplatform 124 being coupled to an end of thecabinet 122. For example, theplatform 124 can hold the DCpower bus bars 110 andthermal extension structures 115 therein. For example, thecabinet 122 can holdelectronic component modules 126 that are electrically coupled to thebus bars 110 via feed connections 127 (e.g., wires). Theplatform 124 can further include other structures such asreceptacles 128 for over-currentcurrent protection devices 130, powertap bus bars 132, and electricalconnection bus bars 134, spacer bus bars 305 (FIGS. 3 a and 3 b) andcabinet connection contacts 136. - Additional examples of cabinets or platforms configurations and other components suitable for embodiments of the
electrical system 100 are provided in the above-identified provisional patent applications, as well as the following non-provisional patent applications: U.S. patent application Ser. No. ______ to Edward Fontana, Paul Smith and William England entitled, “A platform for a power distribution system”; U.S. patent application Ser. No. _______ to Edward Fontana, Paul Smith, William England and Richard Hock, entitled, “Stack of bus bars for a power distribution system”; U.S. patent application Ser. No. ______ to Edward Fontana, Paul Smith and William England, entitled, “A cabinet for a power distribution system”; U.S. patent application Ser. No. ______ to Edward Fontana, Paul Smith and Roy Davis entitled, “A cabinet for a high current power distribution system,” all of which are incorporated herein in their entirety. - The DC
power bus bar 110 can be composed of any electrically conductive material and configured to have physical dimensions that preferably is suitable for carrying high direct currents (e.g., 80 Amps or greater in some cases). Individual bus bars 110 can be configured to deliver a direct current to at least one electronic component module 126 (e.g., telecommunication server equipment), over-currentcurrent protection devices 130, power tap bus bars 132 or electrical connection bus bars 134 of thesystem 100, or, to transfer the direct current to another DCpower bus bar 110 of thesystem 100. - In some embodiments, as shown in
FIG. 2 , thelocation 120 outside of theequipment enclosure 105 can be a pre-designated monitoring site, such as an equipment aisle, situated outside of anouter perimeter 210 of the equipment enclosure 105 (e.g., the outer surfaces of the cabinet and/or platform). For example, thelocation 120 can be adjacent to anopening 140 in theequipment enclosure 105 that allows an unobstructed view of theprojection element 117. In some preferred embodiments, thelocation 120 is situated such that theenclosure perimeter 210 does not need to be breached in order for theprojection element 117 to be viewed. In other cases, however, a covering, door or wall panel of theequipment enclosure 105 can be opened or removed to provide theopening 140 through which the view of theprojection element 117 from thelocation 120 is attained. - The
term termination 145, as used herein, refers to any connecting structure that can attach thebus bar 110 to another bus bar or the other above-mentioned components of thesystem 100. Examples ofterminations 145 include threaded fasteners such as bolt or threaded rod, and in some cases, includes a capping structure, such as a nut that screws onto the bolt or rod. Other types ofterminations 145 that could be used would be apparent to one skilled in the art based upon the present disclosure. - In some preferred embodiments of the
system 100, such as shown inFIG. 3 a, thethermal extension structure 115 is connected to atermination 145 of one or more the bus bars 110 (e.g., a stack of bus bars 110). In some cases, connecting thethermal extension structure 115 directly to thetermination 145 can advantageously provide a more sensitive indicator of a temperature change in thetermination 145 than provided by a indirect connection. - In some cases, such as shown in
FIG. 3 b, thethermal extension structure 115 is connected to another electrical component of thesystem 100 that in turn is connected to thetermination 145, and, thethermal extension structure 115 is located in a vicinity of thetermination 145. For example as shown inFIG. 3 b, the thermal extension structure can be connected to a powertap bus bar 132 of thesystem 100. The powertap bus bar 132 in turn can be connected to atermination 145 that is connected to one or more of the DC power bus bars 110. - Connecting the
thermal extension structure 115 directly to the other electrical component (e.g., power tap bus bar 132) instead of directly to thetermination 145 can be advantageous in situations where theprojection element 117 would not otherwise be viewable from one of thelocations 120, or, where there is insufficient space available in theenclosure 105 to accommodate a direct connection to thetermination 145. - In such embodiments, the
distance 220 separating thethermal extension structure 115 from thetermination 145 can depend on a number of system-specific factors, such as the magnitude of temperature change in thetermination 145 when loose, the heat transfer coefficients of thebus bar 110, thethermal extension structure 115, thetermination 145 and the other electrical component, and, the sensitivity of heat measuring equipment (e.g., a heat imaging devices) deployed to monitor temperature changes in theprojection element 117. For example, in some cases thethermal extension structure 115 can be separated from thetermination 145 on thebus bar 110 by a distance 220 (FIG. 2 ) in a range from about 0.1 to 1 foot. - In some embodiments, the
thermal extension structure 115 can be a continuous part of one of the DC power bus bars 110. For instance, one or more of the bus bars 110 can be formed, e.g., via a molding or machining step, so as to have a thermal extension structure that is an integral part of the material that thebar 110 is composed of. For instance, an end of one ormore bus bar 110 can be formed to have an extension portion that corresponds to thethermal extension 115. - As shown in
FIGS. 1-3 b, some embodiments of thethermal extension structure 115 can advantageously include a mountingelement 150 configured to facilitate attachment of thethermal extension structure 115 to atermination 145 or other electrical component of thesystem 100. In some embodiments, theprojection element 117 and the mountingelement 150 can be composed of the same continuous piece of material that was molded or machined into the desired shape of theelements FIG. 3 a, some embodiments of the mountingelement 150 are, or include, anopening 315 through which a portion of thetermination 145 can pass. For instance, as shown inFIG. 3 a, abolt termination 145 can pass through anopening 315 of a mountingelement 150 and through atermination hole 320 of at least one of the DC power bus bars 110 to thereby connect thethermal extension structure 115 to thebus bar 110. For example, the mountingelement 150 can be configured as a rectangular plate, a washer or washer lock with an extension structure that corresponds to theprojection element 117. - Other example embodiments of the mounting
element 150 include clamps such as spring-loaded or screw-tightened clamps. For example, in some embodiments, where thethermal extension structure 115 is connected to another electrical component such as a powertap bus bar 132, the mountingelement 150 can be or include a clamp that attaches, e.g., to the powertap bus bar 132. Still other embodiments of the mountingelement 150 would be apparent to one skilled in the art based upon the present disclosure. - As further illustrated in
FIGS. 1-3 b, in some embodiments of thethermal extension structure 115, theprojection element 117 extends to anoutside surface 155 of theequipment enclosure 105. For example, as illustrated inFIG. 3 b, theprojection element 117 can be configured as a rod that extends from the mountingelement 150 to theoutside surface 155 of theplatform 124 such that anend 330 of the mountingelement 150 is substantially parallel with theoutside surface 155. In such embodiments, theoutside surface 155 of theequipment enclosure 105 can further includes an opening 335 through which the projection element'send 330 can extend to. - In other embodiments, however, the
projection element 117 can be located inside of theequipment enclosure 105. In such embodiments, for instance, theoutside surface 155 of theequipment enclosure 105 can again include an opening 337 through which asurface 340 of theprojection element 117 can be viewed. In such embodiments, for instance, theprojection element 117 can be configured such that thesurface 340 of theelement 117 is viewable from thelocation 120 outside of theequipment enclosure 105. For example, to facilitate making thesurface 340 viewable from thelocation 120, theprojection element 117 can have an oblique orperpendicular angle 345 with respect to asurface 350 of the component (e.g., a powertap bus bar 132 inFIG. 3 a, or a bus bar 110) that thethermal extension structure 115 is connected to. - In some embodiments, the thermal state of the
projection element 117 is signified by a temperature of theprojection element 117. For instance, when it becomes loose, thetermination 145 heats up and heat is transferred to the connectedthermal extension structure 115, resulting in a temperature increase of theprojection element 117, thereby signifying a change in thermal state. In various embodiments, the absolute temperature, or, a change in temperature, of theprojection element 117 could be used as the thermal state indicator that, in turn, is indicative of a loss in the electrical connectivity of the DCpower bus bar 110 to which theloose termination 145 is connected to. In other embodiments, the thermal state can be signified by a relative temperature of one projection element 117 (e.g., theprojection element 117 shown inFIG. 3 a) compared to a second projection element 117 (e.g., theprojection element 117 shown inFIG. 3 b) of a secondthermal extension structure 115 that is connected to a seconddifferent bus bar 110 of thesystem 100. If one ormore terminations 145 associated with thefirst bus bar 110 are loose and theterminations 145 associated with thesecond bus bar 110 are not loose, thenthermal extension structure 115 that is connected to afirst bus bar 110 will have a different thermal state (e.g., higher temperature) than thethermal extension structure 115 that is connected to asecond bus bar 110. - The thermal state of the
projection element 117 can be measured in a number of different fashions. For instance, and shown inFIG. 2 , in some embodiments, thesystem 100 further includes including aheat imaging device 225 to provide a rapid and non-contact indicator of the thermal state of theelement 117. The use of aheat imaging device 225 can help avoid electrocution hazards in cases where, e.g., thethermal extension 115 is electrically conductive and un-insulated. Examples of suitableheat imaging devices 225 include thermal imaging goggles or thermal imaging cameras. Some embodiments of theheat imaging device 225 can be configured to detect, and present in a heat image, the thermal state of theprojection element 117. For instance, the thermal state of theprojection element 117 can be presented as thermal image that highlights an elevated temperature, or changes in temperature, of aprojection element 117 connected to a DCpower bus bar 110 that has non-optimal electrical connectivity, e.g., due to aloose termination 145. - In other embodiments, to assess the thermal state of the
projection element 117, thesystem 100 can further include a non-contactinfrared thermometer 230 such as a laser-guided infrared thermometer. The use of anon-contact thermometer 230 can also help avoid electrocution hazards in cases similar to theheat imaging devices 225. The use of anon-contact thermometer 230 can also facilitate assessing the thermal state of theprotection element 117 in cases where theelement 117 is located deep inside of the enclosure 105 (e.g., such as shown inFIG. 3 a). - In still other cases, however, the thermal state of the
projection element 117 could be assessed using a contact temperature sensor, such as a resistance thermometer, or simply an inspector's finger to feel the heat or estimate the temperature of theelement 117 in cases where theprojection element 117 extends to the enclosure'soutside surface 155. - In some embodiments, the
thermal extension 115 can be composed of a material that is thermally conductive and electrically insulating. Having thethermal extension 115 composed of such material can help avoid electrocution hazards, e.g., when theprojection element 117 extends to the enclosure'soutside surface 155. Examples of such materials include ceramic material such as silica or electrically conductive heat conductors (e.g., metal particles) embedded in an insulating matrix such as rubbers or non-conducting plastics (e.g., polyester or polyvinyl plastics). In some cases, the entirethermal extension 115 can be composed of the thermally conductive and electrically insulating material. In other cases only theprojection element 117 is composed of the thermally conductive and electrically insulating material. In still other cases, thethermal extension structure 115 can include an electrically conductive metal core (e.g., aluminum) that is coated with an electrically insulating layer such as a rubber or non-conducting plastics, paint or tape layer. - Another embodiment of the disclosure is a method of measuring the electrical connectivity of a DC
power bus bar 110 of theelectrical system 100. For example, the method can be performed on any of thesystems 100 and use any of the components discussed in the context ofFIGS. 1-3 herein. -
FIG. 4 presents a flow diagram of an example embodiment of selected steps in themethod 400 of measuring the DC power bus bar's 110 electrical connectivity. With continuing reference toFIGS. 1-3 b, themethod 400 comprises astep 405 of passing a direct current (e.g., 80 Amps or higher) through the DCpower bus bar 110, and, astep 410 of measuring the thermal state of theprojection element 117. - Some preferred embodiments of measuring the thermal state in
step 410 can include astep 415 of measuring black-body radiation emitted by theprojection element 117. For instance, theheat imaging device 225 or non-contactinfrared thermometer 230 can be used to measure infrared radiation emitted by theprojection element 117 as part ofstep 415. - Some embodiments of the
method 400 further include astep 420 comparing the thermal state of theprojection element 117 to a database to determine if the desired direct current is reliably passing through thebus bar 110. For instance, the database can include a collection of multiple measurements of a target direct current through the DCpower bus bar 110 and a average or range of temperatures (or proxy for temperature) for theprojection element 117, e.g., over a period of known normal operation of thesystem 100. Themethod 400 can include an alertingstep 425 when an un-acceptable direct current is passing through thebus bar 110, if, indecision step 430, the thermal state is determined to be outside of an accepted thermal range (e.g., a measure temperature or temperature proxy exceed the average, or range, of a target temperature) provided by the database. - Although the embodiments have been described in detail, those of ordinary skill in the art should understand that they could make various changes, substitutions and alterations herein without departing from the scope of the disclosure.
Claims (20)
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US12/775,954 US20110140686A1 (en) | 2009-12-16 | 2010-05-07 | Thermal extension structures for monitoring bus bar terminations |
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US12/775,846 Abandoned US20110141666A1 (en) | 2009-12-16 | 2010-05-07 | Stack of bus bars for a power distribution system |
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US13/415,391 Active 2031-01-09 US8797718B2 (en) | 2009-12-16 | 2012-03-08 | Cabinet for a power distribution system |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US8797718B2 (en) | 2009-12-16 | 2014-08-05 | General Electric Company | Cabinet for a power distribution system |
CN107492789A (en) * | 2017-08-25 | 2017-12-19 | 中国联合网络通信集团有限公司 | A kind of distribution system and the method for calculating current-carrying capacity |
Also Published As
Publication number | Publication date |
---|---|
US20120176734A1 (en) | 2012-07-12 |
US20110141663A1 (en) | 2011-06-16 |
US8427815B2 (en) | 2013-04-23 |
US8797718B2 (en) | 2014-08-05 |
US20110141665A1 (en) | 2011-06-16 |
US20110141666A1 (en) | 2011-06-16 |
US20110141664A1 (en) | 2011-06-16 |
US8174821B2 (en) | 2012-05-08 |
US8154856B2 (en) | 2012-04-10 |
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