Embodiments of the present disclosure relate to an electrical distribution device, and more specifically, to a cutout for use in an electrical distribution network.
Typically, protective devices are provided to use in the electricity transmission system for disconnecting a circuit upon detection of a fault condition, e.g., lightning, to prevent power distribution equipments from being damaged. One of such protective devices is known as a cutout, which functions to disconnect a circuit when current in the circuit exceeds a threshold level.
Cutouts normally include a fuse element electrically coupled with its top contact assembly and bottom contact assembly. The fuse element will be melted when current is large enough. The top and bottom contact assemblies of the prior art cutout usually have a plurality of contact elements or current paths, and thus the reliability and conductivity of the top and bottom contact assemblies may be restrained. Therefore, there is a need in the art to come up with a cutout for improving the reliability and conductivity.
In view of above, one of the objectives of the present disclosure is to provide a cutout comprising a novel top contact assembly to overcome at least part of the deficiencies in the prior art.
Another objective of the present disclosure is to provide a cutout comprising a novel bottom contact assembly to overcome at least past of the deficiencies in the prior art.
A further objective of the present disclosure is to provide a cutout comprising a novel top contact assembly and a novel bottom contact assembly to overcome at least part of the deficiencies in the prior art.
According to one aspect of the present disclosure, there is provided a cutout comprising a top contact assembly being capable of electrically coupled with a first electric cable; a bottom contact assembly being capable of electrically coupled with a second electric cable; an insulator assembly secured to the top contact assembly in a first end thereof, and secured to the bottom assembly in a second end thereof opposite to the first end; and a tube assembly having a fuselink placed therein for conducting electricity between the top contact assembly and a bottom contact assembly. The bottom contact assembly has a bottom contact member which is capable of electrically coupled with the second electrical cable at one end thereof and removeably coupled with the tube assembly at the other end thereof such that a current path is formed from the second electrical cable to the tube assembly via the bottom contact member.
According to one embodiment of the present disclosure, the tube assembly can comprise an electrically conducting contact part at the bottom portion thereof, the fuselink is flexibly wrapped into and fixed by the electrically conducting contact part, and the electrically conducting contact part is removeably and electrically coupled with the bottom contact member.
According to one embodiment of the present disclosure, the bottom contact member has a recess for receiving a protrusion of the electrically conducting contact part of the tube assembly. The protrusion is shaped to be capable of being tilted relative to the bottom contact member while being constantly coupled with the bottom contact member.
According to one embodiment of the present disclosure, the electrically conducting contact part comprises an electrically conducting bolt and a nut. The protrusion of the electrically conducting contact part is formed by an end of the electrically conduct bolt facing the bottom contact member. The fuselink extended out of the bottom of the tube assembly can be wrapped into the electrically conducting bolt and is pressed against the nut.
According to one embodiment of the present disclosure, the contact part further comprises a fixing member on which the electrically conducting bolt is riveted, the fuselink is capable of being fixed between the nut and the fixing member despite variations on size of the fuselink, and at least one part of the fixing member is mechanically coupled with the tube assembly. In this configuration, fuselinks with variable sizes can be all fitted tightly to the contact part and the electrical contact between the tube assembly and the bottom assembly is constantly maintained during usage.
According to one embodiment of the present disclosure, the electrically conducting bolt and the nut are made of copper.
According to one embodiment of the present disclosure, the bottom contact member is formed as an inseparable member. In one exemplary embodiment, the bottom contact member is integrally made of copper.
According to one embodiment of the present disclosure, the tube assembly is pivotally coupled with the bottom contact assembly at the bottom portion thereof via a rotating axis of the tube assembly, such that the electrically conducting contact part is electrically coupled with the bottom contact member when the top portion of the tube assembly is coupled with the top contact member, and the contact part is decoupled from the bottom contact member when the top portion of the tube assembly departs from the top contact member in a manner of rotation about the rotating axis of the tube assembly.
According to one embodiment of the present disclosure, the bottom portion of the tube assembly and the bottom contact assembly are pivotally coupled by a hinge defining the rotating axis of the tube assembly. In one exemplary embodiment, the hinge is made of a composite material. In a further exemplary embodiment, the hinge is made of a metal alloy.
According to one embodiment of the present disclosure, the top contact assembly comprises a top contact member which is capable of electrically coupled with the first electrical cable at one end, and coupled with the tube assembly at the other end. The top contact member is formed as an inseparable member. In one exemplary embodiment, the top contact member is integrally made of copper.
According to one embodiment of the present disclosure, the top contact member has a recess which receives a protrusion of the top portion of the tube assembly, and the protrusion is shaped to be capable of being tilted relative to the top contact member while being constantly coupled with the top contact member.
According to a further aspect of the present disclosure, there is provided a cutout comprising a top contact assembly electrically coupled with a first electric cable; a bottom contact assembly electrically coupled with a second electric cable; an insulator assembly secured to the top contact assembly in a first end, and secured to the bottom assembly in a second end opposite to the first end; and a tube assembly having a fuselink placed therein for conducting electricity between the top contact member and the bottom contact member. The top contact assembly comprises a top contact member which is capable of electrically coupled with the first electrical cable at one end thereof, and coupled with the tube assembly at the other end thereof. The top contact member is formed as an inseparable contact member.
According to one embodiment of the present disclosure, the top contact member is integrally made of copper.
According to the embodiments of the present disclosure, the conductivity is improved by using less contacts and shorter current path. Therefore, the cost is reduced because the parts not involved in conducting current can be made of composite materials which are less costly compared with well conducting materials such as copper.
Further, embodiment of the present disclosure provide flexibility of the two ends of the tube assembly in contact with the top contact member and the bottom contact member, where certain misplacement of the contacts, such as tilting, rotating or sliding, is allowed with current stably supplied.
Further, a simpler assembly process is also achieved with the cutout of the present disclosure while keeping the mechanical robustness.
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which;
Reference will now be made in detailed to several embodiments of the present disclosure, example of which are illustrated in the accompanying figures. It is noted that wherever practicable similar or like reference numbers may be used in the figures, and may indicates similar or like functionality. The figures depict embodiments of the present disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the present disclosure described therein.
In accordance with this embodiment, as shown in
In one embodiment, the top contact assembly 100 can further comprise a top contact member 105 which is electrically coupled with and secured to the top terminal strap 101 at one end thereof. For example, as shown in
The top contact member 105 is preferably shaped to be a strip which is flexible at one end distal from the top contact nut 107 and the top contact bolt 108 with a top recess 105a formed thereon. The top recess 105a protrudes upwards as illustrated in
In one embodiment, the top contact assembly 100 can further comprise a top contact holder 109 secured by the top contact nut 107 and the top contact bolt 108. The contact holder 109 can support the top contact member 105 in a manner of being shaped to match the top contact member 105 tightly except for the end where the top recess 105a is located. Preferably, there can be a top spring 110 placed between the top hood 106 and the top contact member 105 for further pressing the top contact member 105 against the contact holder 109.
In accordance with this embodiment, as shown in
In accordance with this embodiment, as shown in
In accordance with this embodiment, as shown in
For example, the fuselink 171 can be composed of at least one flexible wire which will be automatically cut out when current passing therethrough has been higher than a predetermined value for a certain period. As described above, one end of the fuselink 171 is coupled with the cap 173 directly or indirectly, and the other end is electrically coupled with the second electrical cable 160 through parts of the bottom portion of the tube assembly 170 and parts of the bottom contact assembly 140. Detailed descriptions illustrating how electricity is conducted from the fuselink 171 to the second electrical cable 160 will be explained later.
As shown in
As shown in
In one embodiment, as shown in
As clearly shown in
In one embodiment, as shown in
In one embodiment, as shown in
In one embodiment, as shown in
In one embodiment, the fuselink 171 extends out of the housing 172 at the bottom portion of the tube assembly 170. Because the fuselink 171 is flexible, it is wrapped into and fixed by an electrically conducting contact part 177 which is also located at the bottom portion. The contact part 177 is removeably coupled with the bottom contact member 145.
Preferably, as shown in
In one exemplary embodiment, the protrusion of the contact part 177 is capable of being tilted relative to the bottom contact member 145, more specifically to the bottom recess 145a, while being constantly coupled with the bottom contact member 145 for maintaining electrical connection. It should be noted that the protrusion of the contact part 177 is capable of tightly contacting the bottom recess 145a when the contact part 177 is pressed against the bottom recess 145a, by which tilling, rotating or even sliding the protrusion on the bottom contact member 145 or the bottom recess 145a are all possible.
In one exemplary embodiment, as shown in
In one exemplary embodiment, the contact pan 177 is additionally constructed by a fixing member 177c on which the electrically conducting bolt 177a is riveted. By screwing the conducting nut 177b against the fixing member 177c with the fuselink 171 in between, the fuselink 171 is clamped lightly despite its variation on size. Also, at least one part of the fixing member 177c is mechanically coupled with the housing 172 of the lube assembly 170, which ensures a constant pressure of the contact part 177 to the bottom contact member 145 when the top contact member 105 or the top recess 105a receives the cap 173 of the lube assembly 170. In this configuration, fuselinks with variable sizes can be all fitted tightly to the contact part and the electrical contact between the tube assembly and the bottom assembly is constantly maintained during usage.
In one exemplary embodiment, the hinge 176 has a rod 175 by which the whole structure of the tube assembly 170 is placed onto the bottom contact assembly 140, more specifically, the bottom contact frame 146. There can also provided a flipper 178 on the rod 175 with a torsion spring 174 for exerting pressure on the fuselink 171 when the fuselink 171 is installed onto the contact part 177. For example, the fuselink 171 exits from the bottom of the housing 172 to the contact part 177 with the twisted flipper 178 pushing against the fuselink 171 and the torsion spring 174 further bending the fuselink 171. This configuration makes the fuselink 171 straight in the housing 172 and can be tightly secured to the contact part 177.
In one embodiment, the contact part 177 is electrically coupled with the bottom contact member 145 or the bottom recess 145a when the cap 173 of the tube assembly 170 is coupled with the top contact member 105 or the top recess 105a, and the contact part 177 is decoupled from the bottom contact member 145 or the bottom recess 145a when the cap 173 of the tube assembly 170 departs from the top contact member 105 or the top recess 105a in a manner of rotation about the rotating axis of the tube assembly, i.e., the axis defined by the hinge 176 and the rod 175.
Preferably, the cap 173 is configured to match the shape of the top recess 105a in which the cap 173 is received. The cap 173 is capable of being tilted relative to the top contact member 105, more specifically to the top recess 105a, while being constantly coupled with the top contact member 105 for maintaining electrical connection. It should be noted that the cap 173 is capable of tightly contacting the top recess 105a when the cap 173 sits in the top recess 105a with the top spring 110 compressed, by which tilting, rotating or even sliding the cap 173 on the top contact member 105 or the top recess 105a are all possible.
Advantages of this embodiment are that the number of contacts is reduced, and only the bottom terminal 142, the bottom contact member 145, the conducting bolt 177a and the conducting nut 177b should be made of electrically conducting materials for the bottom contact assembly. The rest parts can be made of materials such as composite materials or metal alloy which are less costly. As a result, an improved total conductivity with lower cost can be achieved. Meanwhile, an easier assembly process and shorter assembly time are also advantageous.
In the embodiment as shown in
Preferably, the cap 273 is configured to match the shape of the top recess 205a in which the cap 273 is received. The cap 273 is capable of being tilted relative to the top contact member 205, more specifically to the top recess 205a, while being constantly coupled with the top contact member 205 for maintaining electrical connection. It should be noted that the cap 273 is capable of tightly contacting the top recess 205a when the cap 273 sits in the top recess 205a with the top spring 210 compressed, by which tilting, rotating or even sliding the cap 273 on the top contact member 205 or the top recess 205a are all possible.
Preferably, the top contact member 205 is made of an electrically conducting material, preferably copper or copper alloy, for facilitating the electrical connection between the first electrical cable and the cap 273.
Of course, the top contact assembly of this embodiment can be used together with the bottom contact assembly of previous embodiment as described above for constructing a cutoff as shown in
Advantages of the top contact assembly of this embodiment are that the number of contacts is reduced. As a result of using fewer parts in the top contact assembly, the current path has been shortened. An improved total conductivity with lower cost can be achieved. Meanwhile, an easier assembly process and shorter assembly time are also advantageous. For example, the top contact assembly of this embodiment can be installed by the following steps: inserting the top pin 202 onto the top support 206; placing the top spring 210 between the top support 206 and the top contact member 205 where the top spring 210 is positioned by the top pin 202 and the top recess 205a; and riveting the top cable bolt 204 and top cable nut 203 to fix the top contact assembly structure.
Although claims have been formulated in this application to particular combinations of features, it should be understood that the scope of the disclosure of the present disclosure also includes any novel features or any novel combinations of features disclosed herein either explicitly or implicitly or any generalization thereof, whether or not it relates to the same invention as presently claimed in any claim. The applicants hereby give notice that new claims may be formulated to such features and/or combinations of features during the prosecution of the present application or of any further application derived therefrom.
Number | Name | Date | Kind |
---|---|---|---|
2735911 | Sant | Feb 1956 | A |
2798133 | Curtis | Jul 1957 | A |
3026391 | Bridges | Mar 1962 | A |
4045762 | Foulkes | Aug 1977 | A |
4414527 | Biller | Nov 1983 | A |
4480245 | Carothers et al. | Oct 1984 | A |
5300912 | Tillery et al. | Apr 1994 | A |
20050104709 | Montante | May 2005 | A1 |
20110146106 | Kaufman | Jun 2011 | A1 |
Number | Date | Country |
---|---|---|
200965855 | Oct 2007 | CN |
201450327 | May 2010 | CN |
101855692 | Oct 2010 | CN |
102789933 | Nov 2012 | CN |
2011133485 | Oct 2011 | WO |
Entry |
---|
International Search Report and Written Opinion, PCT/US2013/086238, ABB Technology Ltd et al., dated Jul. 30, 2014. |
Australian Examination Report, Australian Patent Application No. 2013404504, dated Oct. 26, 2016, 2 pages. |
First Chinese Office Action, Chinese Patent Application No. 201380080507.6, dated Apr. 6, 2017, 5 pages including English Translation. |
Chinese Search Report, Chinese Patent Application No. 201380080507.6, dated Apr. 6, 2017, 4 pages including English Translation. |
Number | Date | Country | |
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20160240336 A1 | Aug 2016 | US |
Number | Date | Country | |
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Parent | PCT/CN2013/086238 | Oct 2013 | US |
Child | 15139980 | US |