CN105720538A - Design method of connecting column for reducing temperature rise at overlap position between electric bus bars - Google Patents
Design method of connecting column for reducing temperature rise at overlap position between electric bus bars Download PDFInfo
- Publication number
- CN105720538A CN105720538A CN201610239838.5A CN201610239838A CN105720538A CN 105720538 A CN105720538 A CN 105720538A CN 201610239838 A CN201610239838 A CN 201610239838A CN 105720538 A CN105720538 A CN 105720538A
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- CN
- China
- Prior art keywords
- columnar part
- connecting column
- busbar
- temperature rise
- bus bars
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
- H02G5/10—Cooling
Abstract
The invention discloses a design method of a connecting column for reducing temperature rise at an overlap position between electric bus bars, belongs to the field of power equipment, and particularly relates to a design method of a connecting column. The design method of the connecting column disclosed by the invention comprises the following steps: providing first columnar parts which are in interference fit with prefabricated holes in the electric bus bars, wherein the first columnar parts are electrically conductive; coaxially arranging second columnar parts which are electrically conductive in the first columnar parts; making the first columnar parts be in interference fit with the second columnar parts; and making thermal expansion coefficients of the second columnar parts be greater than the thermal expansion coefficients of the first columnar parts. The connecting column made by the design method disclosed by the invention has the beneficial effects that 1, more electric conduction area is formed at a same overlap length, so that the current density is lowered, and low temperature rise of the bus bars is realized; 2, a using quantity of the bus bars is reduced, and resources are saved; 3, electric clearances or space distances are increased, and the electrical safety of equipment is enhanced; and 4, arrangement widths of the bus bars are reduced, so that space occupied by the bus bars can be reduced.
Description
Technical field
The present invention relates to field of electrical equipment, be specifically related to the method for designing of the connecting column of a kind of power bus-bar.
Background technology
In field of power distribution, the connection of two power bus-bars generally adopts overlapping splicing processes, fastens with bolt more afterwards.Such as the upper semisection of Fig. 1, such coupling method needs two busbar overlap certain lengths, so that the electric current density of contact surface maintains in certain limit value, so that the temperature rise of connection place meets relevant criterion.In order to make power equipment temperature rise low, it usually needs increase the length that busbar is overlapping, make contact area increase, and then make the electric current density of contact surface reduce, finally make equipment have relatively low temperature rise.And increase overlap length and can strengthen the consumption of busbar, and then increase the manufacturing cost of equipment.The bolt of fastening can make the electric clearance between busbar or phase spacing reduce, and in order to make electric clearance or phase spacing remain unchanged, it is necessary to the spacing of busbar strengthened, and strengthens busbar spacing and necessarily causes busbar to take up room change greatly.
How to increase contact area and to make busbar temperature rise low, but do not reduce electric clearance or phase spacing, and do not strengthen busbar and take up room.
Summary of the invention
It is an object of the invention to solve the problems referred to above, and the method for designing of a kind of connecting column for reducing the temperature rise of electrician busbar lap-joint is provided.
For this, the present invention provides the method for designing of a kind of connecting column, it includes providing and has and the first columnar part of the pre-manufactured hole interference fit on electrician's busbar, first columnar part has electric conductivity, the second columnar part it is coaxially disposed in the first columnar part, second columnar part has electric conductivity, makes the first columnar part and the second columnar part interference fit, makes the coefficient of thermal expansion coefficient of thermal expansion more than the first columnar part of the second columnar part.
Advantageously, the resistivity resistivity more than the first columnar part of the second columnar part is made.
Specifically, the material of the second columnar part is set to aluminum or aluminium alloy, the material of the first columnar part is set to copper or copper alloy.
Preferably, the ratio making the external diameter of the second columnar part and the external diameter of the first columnar part is 0.5-0.8.
Specifically, the second columnar part is set to solid construction, the first columnar part is set to the structure of hollow, make the second columnar part run through the first columnar part.
Advantageously, being coaxially arranged with the second through hole inside connecting column, the outer cylinder at connecting column is radially arranged the first through hole, makes the first through hole and the connection of the second through hole, makes the first through hole be positioned at the axial middle part of connecting column.
Beneficial effect
Adopt the connecting column that method for designing disclosed by the invention makes can bring following beneficial effect:
1. the identical lap of splice produces more conductive area, and then reduces electric current density, it is achieved the low-temperature-rise of busbar.
2., without busbar being carried out overlapping overlap joint, reducing the consumption of busbar, having saved resource.
3., owing to eliminating fastening screw screw bolt and nut, so increasing electric clearance or phase spacing, improve the electrical security of equipment.
4., owing to eliminating fastening screw screw bolt and nut, so reducing the wiring width of busbar, taking up room of busbar can be reduced.
Accompanying drawing explanation
In explanation below in reference to the accompanying drawing embodiment to providing as non-limiting example, the present invention and superiority thereof will be better understood, accompanying drawing is as follows:
Fig. 1 is the contrast axonometric chart of existing busbar connecting mode and connecting mode disclosed by the invention；
Fig. 2 is the fragmentary perspective cross sectional view of connecting column disclosed by the invention；
Fig. 3 is Fig. 1 top view；
Fig. 4 is the axonometric chart of connecting column disclosed by the invention；
Fig. 5 is the perspective cut-away view of Fig. 1 busbar connection place disclosed by the invention；
Fig. 6 is the exploded perspective view of Fig. 5；
Fig. 7 is Fig. 5 pin exploded perspective view；
Fig. 8 is the exploded perspective view of Fig. 4；
Fig. 9-11 is the arrangement schematic diagram of connecting column disclosed by the invention；
Figure 12 is the afterbody axonometric chart with the pin of screwed hole；
Figure 13 is busbar axonometric chart；
Figure 14 is the axonometric chart of connecting column；
Figure 15 is the perspective cut-away view of Figure 14.
Description of reference numerals
1. the first columnar part；2. the second columnar part；3. the first side；4. the second side；5. end face；6. the first perforation；7. the second through hole.
Detailed description of the invention
R in present specification represents radius.
As shown in Figure 1, Figure 3, the first half is the connecting mode that existing three-phase distribution busbar is conventional, after two busbar overlap certain lengths, then the two is fastened with screw bolt and nut.Lower half is busbar connecting mode disclosed by the invention, and in order to strengthen the contrast effect of two kinds of connecting modes, connecting mode disclosed by the invention is set directly at the lower section of existing connecting mode.Two kinds of connecting modes the lap of splice the same, be all L5, be presented as: the overlap length of two busbars under existing connecting mode is L5, the length of the connecting column under connecting mode disclosed by the invention is also L5.
As shown in Figure 3, the directly perceived change that two kinds of connecting modes bring is exactly the significant change of relative dimensions, L1 is the electric clearance under existing connecting mode, L2 is the electric clearance under connecting mode disclosed by the invention, L3 is that the busbar under existing connecting mode takies width, and the busbar that L4 is under connecting mode disclosed by the invention takies width.L2 is significantly greater than L1, and the size of increase is approximately the height of the prominent nut of the twice of busbar thickness, bolt head height, height of nut and bolt tail.L4 is significantly less than L3, and the size of reduction is approximately the height of the prominent nut of bolt head height, height of nut and bolt tail.Therefore, the factor (electric clearance) that power equipment is favourable is improved, and the disadvantageous factor of power equipment (taking up room) is obtained minimizing.
As shown in Figure 4, a kind of connecting column disclosed by the invention, it has columned profile, and end is provided with chamfering convenient for assembly.
As in figure 2 it is shown, be coaxially disposed the first columnar part 2 in the first columnar part 1, the first columnar part 1 and the first columnar part 2 interference fit.
As shown in Figure 8, the first columnar part 2 has solid construction, and the first columnar part 1 has the structure of hollow, and the first columnar part 2 runs through the first columnar part 1, and the ratio of the external diameter of the first columnar part 2 and the external diameter of the first columnar part 1 is 0.5-0.8.First and second columnar part 1,2 all has electric conductivity, and the coefficient of thermal expansion of the first columnar part 2 is more than the coefficient of thermal expansion of the first columnar part 1, and the resistivity of the first columnar part 2 is more than the resistivity of the first columnar part 1.
After connecting column is assemblied in busbar, due to the pre-manufactured hole interference fit of the first columnar part 1 with busbar, so, the first columnar part 1 and busbar fit tightly, and the first columnar part 1 of connecting column fully carries electric current.Due to the first columnar part 1 and the first columnar part 2 also interference fit, so the first columnar part 1 and the first columnar part 2 also fit tightly, the first columnar part 2 also fully carries electric current.Therefore, the heat effect of the first columnar part 1 and the first columnar part 2 can give full play to, owing to the resistivity of the first columnar part 2 is more than the resistivity of the first columnar part 1, so the temperature of the first columnar part 2 can be higher than the first columnar part 1, owing to the coefficient of thermal expansion of the first columnar part 2 is more than the coefficient of thermal expansion of the first columnar part 1, therefore, when temperature and coefficient of thermal expansion are all relatively high, the radially enlarged phenomenon of the first columnar part 2 can be significantly greater than the radially enlarged phenomenon of the first columnar part 1, therefore the first columnar part 2 can fit tightly the first columnar part 1 and apply radially outer pressure to the first columnar part 1, the radial dimension thus making the first columnar part 1 also outwards becomes big, ultimately result in the first columnar part 1 more to fit tightly with busbar pre-manufactured hole, also provide radially outer pressure to pre-manufactured hole simultaneously, namely the pressure ratio connecting column between connecting column and busbar is bigger when just assembling, increasing contact pressure can also make the temperature rise of contact site reduce.
As can be seen here, the temperature rise reducing busbar connection place is had obvious action by the coupling of interference fit between each feature, the coupling of resistivity and coefficient of thermal expansion, effect between three is complementary, originally interference fit makes resistivity and coefficient of thermal expansion have the basis played a role, and the effect that resistivity and coefficient of thermal expansion produce exacerbates interference fit, finally so that the contact pressure of connection place strengthens.
As shown in figure 11, cross section is foursquare busbar, and centre is provided with a pre-manufactured hole receiving connecting column, and pre-manufactured hole circumference is R to the distance of bus bar edge, and busbar width is L6.When adopting existing overlapping splicing processes to couple, the conductive area of connection place is
S1=L6xL5=(R+2R+R) xL5=4RxL5(L5 is the lap of splice, as shown in Figure 3)
And when adopting connecting column to couple, the conductive area of connection place is
S2=2πRxL5
Therefore,
S2:S1=2πR:4R=π/2≈1.57
So, adopt the mode of connecting column overlap joint can obtain more contact area.Obviously, when meeting mechanical strength, increase the diameter of pre-manufactured hole, reduce hole back gauge and can obtain bigger contact area.
As shown in Figure 10, cross section is rectangular busbar, and centre arranges 6 pre-manufactured holes receiving connecting column, and pre-manufactured hole circumference is R to the distance of bus bar edge, and the beeline between each hole is R, and busbar width is L6.When adopting existing overlapping splicing processes to couple,
The conductive area of connection place is
S1=L6xL5=(7R+6x2R)xL5=19RxL5
And when adopting connecting column to couple, the conductive area of connection place is
S2=6x2πRxL5=12πRxL5
Therefore,
S2:S1=12πR:19R=12π/19≈1.98
So, adopt the mode of connecting column overlap joint can obtain more contact area.Obviously, when meeting mechanical strength, increase the diameter of pre-manufactured hole, reduce hole back gauge and can obtain bigger contact area.
As it is shown in figure 9, cross section is rectangular busbar, centre arranges 6 pre-manufactured holes receiving connecting column, and pre-manufactured hole circumference is 1.5R to the distance of bus bar edge, and the beeline between each hole is R, and busbar width is L6.When adopting existing overlapping splicing processes to couple,
The conductive area of connection place is
S1=L6xL5=(1.5R+5R+1.5R+6x2R) xL5=20RxL5,
And when adopting connecting column to couple, the conductive area of connection place is
S2=6x2πRxL5=12πRxL5
Therefore,
S2:S1=12πR:20R=12π/20≈1.88
So, adopt the mode of connecting column overlap joint can obtain more contact area.Obviously, when meeting mechanical strength, increase the diameter of pre-manufactured hole, reduce hole back gauge and can obtain bigger contact area.
Therefore, connecting column disclosed by the invention creates the good effect of two aspects, and one is the increase in contact pressure, two is increased considerably conductive area, under the combined effect of the two active factor, the temperature rise of connection place is greatly lowered, it is achieved that the purpose of the present invention.
As it is shown in figure 5, connecting column disclosed by the invention applies to the fragmentary perspective cross sectional view of busbar connection place, the material of the first columnar part 1 of connecting column is copper, and the material of the first columnar part 2 is aluminum.Before assembling, first processing the pre-manufactured hole of 6 Ghana's connecting columns at the end face 5 of the first busbar along the length direction of busbar, the diameter of pre-manufactured hole is slightly less than the external diameter of connecting column, makes connecting column and pre-manufactured hole interference fit diametrically；The degree of depth of the pre-manufactured hole connecting column length slightly larger than 0.5 times, after the first and second busbar docking, makes connecting column and pre-manufactured hole matched in clearance in the axial direction, is conducive to being close to of two busbar end faces, and the head processing of pre-manufactured hole has the chamfering of convenient installation.First 6 connecting columns are fitted in the pre-manufactured hole of the first busbar, it is seated after again the pre-manufactured hole of the second busbar being directed at connecting column, the end face making two busbars is fitted, afterwards in the processing of the side 3,4 of first, second busbar for assembling the hole (see figure 7) of pin, make hole and pin interference fit, after pin is seated, mutual the moving axially of first, second busbar can be limited, finally making connecting column, busbar, pin three firmly couples simultaneously.Dismantle for the ease of the later stage, at the afterbody thread mill drilling (see Figure 12) of pin, when busbar dismantled by needs, easily pin can be dismantled by the screwed hole of pin afterbody, and then by two busbar separation (see figure 6)s.
As shown in figure 13, in order to distinguish each face of busbar, end face 5 is defined as the thickness with busbar and the face of width composition, namely identifies the face of 5 in Figure 13.Side is defined as the thickness with busbar and the face of length composition, namely identifies the face of 3,4 in figure, and 3 is the first side, and 4 is the second side.
Embodiment two
The material of the first columnar part 1 in embodiment one is changed to copper alloy, the material of the first columnar part 2 changes to aluminium alloy, owing to the hardness of alloy is more relatively high, first the first columnar part 2 can be preserved under low temperature environment (5 degree) a period of time (5 minutes), and the first columnar part 1 preserves a period of time (5 minutes) under hot environment (80 degree), by effect of expanding with heat and contract with cold, the internal diameter that can make the first columnar part 1 slightly becomes big, and the external diameter of the first columnar part 1 slightly diminishes, and then easily the first columnar part 2 is assembled in the first columnar part 1, after the connecting column prepared to be installed recovers room temperature, first columnar part 1 and the first columnar part 2 can realize interference fit.The diameter of connecting column disclosed by the invention and length have different size specification, to adapt to the needs of different busbar size.
Embodiment three
As shown in figs. 14-15, the inside of the second columnar part 2 is coaxially arranged with the second through hole 7, first columnar part 6 has hollow structure, second columnar part 2 runs through the first columnar part 1, the outer cylinder of the first columnar part 1 is radially arranged the first through hole 6, first through hole 6 connects with the second through hole 7, and the first through hole 6 is positioned at the axial middle part of the first columnar part 1.
Setting due to through hole 6,7, make connecting column in inserting the process of pre-manufactured hole of the first busbar, air in pre-manufactured hole can successfully be discharged from the second through hole 7, and then connecting column can be successfully seated, when the second busbar is inserted in already installed connecting column, air in the pre-manufactured hole of the second busbar can be smoothly through the second through hole 7 and discharge from the first through hole 6, and then the second busbar can be seated smoothly.
Claims (6)
1., for reducing a method for designing for the connecting column of electrician busbar lap-joint temperature rise, it includes providing first columnar part (1) with the conduction with electrician's busbar interference fit, it is characterised in that
Second columnar part (2) with electric conductivity is provided, makes the first columnar part (1) and the second columnar part (2) arranged coaxial, make the first columnar part (1) and the second columnar part (2) interference fit；
Second columnar part (2) is arranged at the first columnar part (1) internal, makes the coefficient of thermal expansion coefficient of thermal expansion more than the first columnar part (1) of the second columnar part (2).
2. the method for designing of a kind of connecting column for reducing the temperature rise of electrician busbar lap-joint according to claim 1, it is characterised in that make the resistivity resistivity more than the first columnar part (1) of the second columnar part (2).
3. the method for designing of a kind of connecting column for reducing the temperature rise of electrician busbar lap-joint according to claim 2, it is characterized in that, the material of the second columnar part (2) is set to aluminum or aluminium alloy, the material of the first columnar part (1) is set to copper or copper alloy.
4. the method for designing of a kind of connecting column for reducing the temperature rise of electrician busbar lap-joint according to claim 1, it is characterised in that the ratio making the external diameter of the second columnar part (2) and the external diameter of the first columnar part (1) is 0.5-0.8.
5. the method for designing of a kind of connecting column for reducing the temperature rise of electrician busbar lap-joint according to claim 4, it is characterized in that, second columnar part (2) is set to solid construction, first columnar part (1) is set to hollow structure, makes the second columnar part (2) run through the first columnar part (1).
6. the method for designing of a kind of connecting column for reducing the temperature rise of electrician busbar lap-joint according to claim 4, it is characterized in that, the second through hole (7) it is coaxially arranged with inside connecting column, outer cylinder at connecting column is radially arranged the first through hole (6), make the first through hole (7) connect with the second through hole (6), make the first through hole (6) be positioned at the axial middle part of connecting column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610239838.5A CN105720538A (en) | 2016-04-18 | 2016-04-18 | Design method of connecting column for reducing temperature rise at overlap position between electric bus bars |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610239838.5A CN105720538A (en) | 2016-04-18 | 2016-04-18 | Design method of connecting column for reducing temperature rise at overlap position between electric bus bars |
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| CN105720538A true CN105720538A (en) | 2016-06-29 |
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| CN201610239838.5A Pending CN105720538A (en) | 2016-04-18 | 2016-04-18 | Design method of connecting column for reducing temperature rise at overlap position between electric bus bars |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107732548A (en) * | 2017-04-10 | 2018-02-23 | 龚柱 | Vapour-pressure type power bus-bar couples instrument |
| CN108258633A (en) * | 2017-04-10 | 2018-07-06 | 龚柱 | Air motor formula power bus-bar couples tool |
| CN110380320A (en) * | 2019-08-16 | 2019-10-25 | 晋江叁井古德工业设计有限公司 | Power bus-bar interconnection method, docking platform and its platform operating method |
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| JPH05234775A (en) * | 1992-02-24 | 1993-09-10 | Toshiba Corp | Lead conductor connection structure for transformer |
| CN200969410Y (en) * | 2006-06-29 | 2007-10-31 | 上海置信电气股份有限公司 | Transformational structure for transformer low-voltage casing tube wiring terminal |
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| CN107732548A (en) * | 2017-04-10 | 2018-02-23 | 龚柱 | Vapour-pressure type power bus-bar couples instrument |
| CN108258633A (en) * | 2017-04-10 | 2018-07-06 | 龚柱 | Air motor formula power bus-bar couples tool |
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| CN110380320A (en) * | 2019-08-16 | 2019-10-25 | 晋江叁井古德工业设计有限公司 | Power bus-bar interconnection method, docking platform and its platform operating method |
| CN111801853A (en) * | 2019-08-16 | 2020-10-20 | 龚柱 | Power bus bar butt joint method, butt joint platform and platform operation method thereof |
| US10971877B2 (en) | 2019-08-16 | 2021-04-06 | Gong Zhu | Busbars docking platform |
| CN111801853B (en) * | 2019-08-16 | 2021-07-09 | 泉州睿郎机电技术有限公司 | Power bus-bar butt-joint platform |
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