CN105761921A - Design method for dry-type electric transformer - Google Patents
Design method for dry-type electric transformer Download PDFInfo
- Publication number
- CN105761921A CN105761921A CN201610351928.3A CN201610351928A CN105761921A CN 105761921 A CN105761921 A CN 105761921A CN 201610351928 A CN201610351928 A CN 201610351928A CN 105761921 A CN105761921 A CN 105761921A
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- columnar part
- low
- voltage output
- hole
- connecting column
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 21
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000003032 molecular docking Methods 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F27/292—Surface mounted devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
本发明公开一种干式电力变压器的设计方法，属于电力设备领域。本发明公开的设计方法包括提供高压绕组、低压绕组及铁磁芯，在低压绕组上设置低压输出端，在低压输出端设置联接柱，使联接柱部分嵌入低压输出端且与低压输出端过盈配合，在联接柱上设置与电力母排过盈配合的导电的第一柱状部，在第一柱状部内同轴设置具有导电性的第二柱状部，使第一柱状部和第二柱状部过盈配合，使第二柱状部的热胀系数大于第一柱状部的热胀系数。本发明公开的设计方法具有如下有益效果：1.相同的搭接长度产生更多的导电面积，进而降低电流密度，实现低压输出端的低温升。2.降低了母排的用量，节约了资源。3.加大了电气间隙或者安全距离，提高了设备的电气安全性。
The invention discloses a design method of a dry-type power transformer, which belongs to the field of electric equipment. The design method disclosed in the present invention includes providing a high-voltage winding, a low-voltage winding and a ferromagnetic core, setting a low-voltage output end on the low-voltage winding, and setting a connecting post at the low-voltage output end, so that the connecting post is partially embedded in the low-voltage output end and interferes with the low-voltage output end Cooperate, set the conductive first columnar part on the connecting column that is interference fit with the power busbar, and coaxially arrange the second columnar part with conductivity in the first columnar part, so that the first columnar part and the second columnar part pass through The interference fit makes the coefficient of thermal expansion of the second columnar portion greater than that of the first columnar portion. The design method disclosed in the present invention has the following beneficial effects: 1. The same lap length produces more conductive areas, thereby reducing the current density and realizing low temperature rise at the low-voltage output end. 2. Reduce the consumption of busbars and save resources. 3. Increase the electrical clearance or safety distance, and improve the electrical safety of the equipment.
Description
Technical field
The present invention relates to field of electrical equipment, be specifically related to the method for designing of a kind of dry-type power transformer.
Background technology
In the power distribution room of factory, dry-type transformer low-voltage output generally adopts power bus-bar directly to couple, and power bus-bar is directly overlapped on low-voltage output, and low-voltage output couples the generally overlapping splicing processes of employing with power bus-bar, fastens with bolt more afterwards.Such as the upper semisection of Fig. 7, such coupling method needs overlapping with outfan for busbar certain length, 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 connection place temperature rise low, it usually needs increase the length that busbar is overlapping with terminal, make contact area increase, and then make the electric current density of contact surface reduce, finally make connection place have relatively low temperature rise.And increase overlap length and can strengthen the consumption of busbar, and then increase manufacturing cost.The bolt of fastening can make the electric clearance between conductive component and non conductive component or safe distance reduce, in order to make electric clearance or safe distance remain unchanged, need to strengthen the spacing between outfan and non conductive component, and strengthen spacing and necessarily cause transformator to take up room change greatly.How to increase contact area and to make connection place temperature rise low, but do not reduce electric clearance, and do not strengthen transformator 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 dry-type power transformer is provided.
For this, the present invention provides the method for designing of a kind of dry-type power transformer, it includes providing high pressure winding, low pressure winding and ferromagnetic core, high pressure winding and low pressure winding is made to be coaxially disposed and be passed by ferromagnetic core, high pressure winding arranges high voltage input terminal, low pressure winding arranges low-voltage output, at low-voltage output, connecting column is set, make connecting column be partially submerged into low-voltage output and with low-voltage output interference fit, the first columnar part of the conduction of setting and power bus-bar interference fit on connecting column, first columnar part is coaxially disposed second columnar part with electric conductivity, make the first columnar part and the second columnar part interference fit, second columnar part is arranged at the inside of the first columnar part, make 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 described columnar part is made.
Specifically, the material of the second described 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 of the external diameter of the second described columnar part and the external diameter of the first columnar part is set to 0.5-0.8.
Specifically, the second columnar part is set to solid construction, the first columnar part is set to hollow structure, 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, and the first through hole is arranged at the axial middle part of connecting column.
Beneficial effect
Owing to the method for designing of dry-type power transformer disclosed by the invention is to be coupled with power bus-bar with the connecting mode of docking by low-voltage output, relative to existing overlapping overlapping mode, it 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 connection place.
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 safe distance, improve the electrical security of equipment.
4., owing to eliminating fastening screw screw bolt and nut, so the distance between connection place and non conductive component becomes big, and taking up room of transformator does not increase.
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 axonometric chart of existing dry-type power transformer, and wherein power bus-bar overlaps；
Fig. 2 is the partial enlarged drawing at A place in Fig. 1；
Fig. 3 is the axonometric chart of dry-type power transformer disclosed by the invention, and wherein power bus-bar is to connecting；
Fig. 4 is the partial enlarged drawing at B place in Fig. 3；
Fig. 5 is the axonometric chart of dry-type power transformer disclosed by the invention；
Fig. 6 is the partial enlarged drawing at C place in Fig. 5；
Fig. 7 is existing power bus-bar overlapping mode and the size comparison of power bus-bar docking mode disclosed by the invention schemes；
Fig. 8 is the exploded partial perspective view of the low-voltage output position of Fig. 3；
Fig. 9 is the axonometric chart of connecting column disclosed by the invention；
Figure 10 is the perspective cut-away view of Fig. 9；
Figure 11 is the exploded perspective view of Fig. 9；
Figure 12-13 is the arrangement schematic diagram of connecting column disclosed by the invention；
Figure 14 is the axonometric chart of power bus-bar.
Description of reference numerals
1. the first columnar part；2. the second columnar part；3. front；4. the back side；5. end face；6. the first through hole；7. the second through hole.
Detailed description of the invention
R in present specification represents radius.
As shown in Figure 1, it it is the low-voltage output connecting mode with power bus-bar of existing dry-type power transformer, the connecting mode adopted is overlapping overlapping mode, after power bus-bar and low-voltage output overlap certain length, with screw bolt and nut, the two is fastened again, such connecting mode is defined as overlap joint, as shown in Figure 2.
As shown in Figure 5, being dry-type power transformer disclosed by the invention, it has high pressure winding, low pressure winding and ferromagnetic core, high pressure winding and low pressure winding and is coaxially disposed and is passed by ferromagnetic core, high pressure winding is provided with high voltage input terminal, and low pressure winding is provided with low-voltage output.
As shown in Figure 6, low-voltage output is provided with connecting column, connecting column be partially submerged into low-voltage output and with low-voltage output interference fit, embedded length is the half of connecting column length, the lower half of connecting column embeds low-voltage output, and connecting column is coupled by the pin in low-voltage output front with the fastening of both low-voltage outputs.
As shown in Figure 3-4, pre-manufactured hole on power bus-bar is inserted in the connecting column on low-voltage output, power bus-bar and connecting column interference fit, the end face of power bus-bar is fitted with the end face of low-voltage output, connecting column is coupled by the pin in power bus-bar front with the fastening of both power bus-bars, and such connecting mode is defined as docking.
As shown in Figure 7, it is existing power bus-bar overlapping mode and the size comparison of power bus-bar docking mode disclosed by the invention schemes, the first half is the low-voltage output overlapping mode with power bus-bar of existing dry-type power transformer, lower half is the low-voltage output docking mode with power bus-bar of dry-type power transformer disclosed by the invention, and in figure, the solid line on right side is the boost line designed to calculate electric clearance or safe distance.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 the power bus-bar under existing connecting mode and low-voltage output is L5, and the length of the connecting column under connecting mode disclosed by the invention is also L5.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 or safe distance, L2 is the electric clearance under connecting mode disclosed by the invention or safe distance, L3 is that the connection place under existing connecting mode takies width, and the connection place that L4 is under connecting mode disclosed by the invention takies width.Can visually see from figure: L2 is significantly greater than L1, the size of increase is approximately busbar thickness and adds bolt head height.L4 is significantly less than L3, and the size of reduction is approximately busbar thickness and adds bolt head height and add height of nut and add the height of the prominent nut of bolt tail.Therefore, the factor (electric clearance or safe distance) that power equipment is favourable is improved, and the disadvantageous factor of power equipment (taking up room) is obtained minimizing.
As it is shown in figure 9, a kind of connecting column disclosed by the invention, it has columned profile, and end is provided with chamfering convenient for assembly.
As shown in Figure 10, in the first columnar part 1, it is coaxially disposed the second columnar part 2, the first columnar part 1 and the second columnar part 2 interference fit.
As shown in figure 11, the first columnar part 1 has the structure of hollow, and the second columnar part 2 runs through the first columnar part 1, and the ratio of the external diameter of the second 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 second columnar part 2 is more than the coefficient of thermal expansion of the first columnar part 1, and the resistivity of the second columnar part 2 is more than the resistivity of the first columnar part 1.
Be assemblied in low-voltage output and power bus-bar when connecting column after, pre-manufactured hole interference fit due to the first columnar part 1 with low-voltage output and busbar, so, the first columnar part 1 and low-voltage output 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 second columnar part 2 also interference fit, so the first columnar part 1 and the second columnar part 2 also fit tightly, the second columnar part 2 also fully carries electric current.nullTherefore，The heat effect of the first columnar part 1 and the second columnar part 2 can give full play to，Owing to the resistivity of the second columnar part 2 is more than the resistivity of the first columnar part 1，So the temperature of the second columnar part 2 can be higher than the first columnar part 1，Owing to the coefficient of thermal expansion of the second 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 second columnar part 2 can be significantly greater than the radially enlarged phenomenon of the first columnar part 1，Therefore the second 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，The pre-manufactured hole ultimately resulting in the first columnar part 1 and low-voltage output and power bus-bar more fits tightly，Also provide radially outer pressure to pre-manufactured hole simultaneously，Namely the pressure ratio connecting column between connecting column and low-voltage output 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 coupling of interference fit between each feature, the coupling of resistivity and coefficient of thermal expansion has obvious action to reducing the low-voltage output temperature rise with busbar connection place, 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 12, cross section is foursquare power bus-bar, 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 7)
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 13, cross section is rectangular power bus-bar, and centre arranges 3 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=(4R+3x2R)xL5=10RxL5
And when adopting connecting column to couple, the conductive area of connection place is
S2=3x2πRxL5=6πRxL5
Therefore,
S2:S1=6πR:10R=3π/5≈1.884
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 shown in Figure 8, the low-voltage output of dry-type power transformer disclosed by the invention, the material of the first columnar part 1 of connecting column is copper, and the material of the second columnar part 2 is aluminum.Before connecting column is assemblied in low-voltage output, first processing 3 pre-manufactured holes receiving connecting columns at the end face 5 of low-voltage output along the length direction of outfan, 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 pre-manufactured hole processes, the half length of connecting column is inserted in pre-manufactured hole, the first through hole in the middle part of connecting column is made to be in end face 5 place, vertically process the through hole for assembling pin from the front 3 of low-voltage output, make through hole run through front 3 and the back side 4 of low-voltage output, and run through connecting column simultaneously, the axis of through hole and the axes intersect of connecting column, coupled the fastening of both low-voltage output and connecting column by pin.
Before power bus-bar is assemblied in low-voltage output, first processing 3 pre-manufactured holes at the end face 5 of power bus-bar along busbar length direction, the diameter of pre-manufactured hole is slightly less than the external diameter coupling pillar, 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 pre-manufactured hole processes, pre-manufactured hole on power bus-bar is inserted in the connecting column revealed on low-voltage output, until the end face 5 of the end face 5 of power bus-bar and low-voltage output is fitted, the through hole for assembling pin is vertically processed from the front 3 of power bus-bar, through hole is made to run through front 3 and the back side 4 of power bus-bar, and run through connecting column simultaneously, the axis of through hole and the axes intersect of connecting column, by pin, the fastening of both power bus-bar and connecting column is coupled, the fastening finally achieving power bus-bar and low-voltage output couples.
After low-voltage output and power bus-bar docking, making connecting column and pre-manufactured hole matched in clearance in the axial direction, be conducive to being close to of the end face of low-voltage output and the end face of power bus-bar, the head processing of pre-manufactured hole has the chamfering of convenient installation.Due to hole and pin interference fit, after pin is seated, can limiting low-voltage output and mutual the moving axially of power bus-bar, finally make low-voltage output, connecting column, power bus-bar, pin firmly couples together.
As shown in figure 14, in order to distinguish each face of busbar and low-voltage output, end face 5 is defined as the thickness with busbar (or low-voltage output) and the face of width composition, namely identifies the face of 5 in Figure 14.Front and back is defined as the width with busbar (or low-voltage output) and the face of length composition, namely identifies the face of 3,4 in figure, and 3 is front, and 4 is the back side.
As shown in Figure 10, 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 low-voltage output, air in pre-manufactured hole can successfully be discharged from the second through hole 7, and then connecting column can be successfully seated, when power bus-bar is inserted in already installed connecting column, air in the pre-manufactured hole of power bus-bar 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.
Embodiment two
The material of the first columnar part 1 in embodiment one is changed to copper alloy, the material of the second columnar part 2 changes to aluminium alloy, owing to the hardness of alloy is more relatively high, first the second 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 second 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 second 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 or low-voltage output size.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351928.3A CN105761921A (en) | 2016-05-24 | 2016-05-24 | Design method for dry-type electric transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610351928.3A CN105761921A (en) | 2016-05-24 | 2016-05-24 | Design method for dry-type electric transformer |
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| CN105761921A true CN105761921A (en) | 2016-07-13 |
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| CN201610351928.3A Pending CN105761921A (en) | 2016-05-24 | 2016-05-24 | Design method for dry-type electric transformer |
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| 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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| CN102856677A (en) * | 2011-06-27 | 2013-01-02 | 泰科电子(上海)有限公司 | Electric connecting device |
| CN203179814U (en) * | 2013-03-08 | 2013-09-04 | Abb技术有限公司 | Connecting device between middling pressure breaker contact arm and solid-sealed polar pole |
| CN203983533U (en) * | 2014-07-31 | 2014-12-03 | 西安神电高压电器有限公司 | A kind of jockey |
| CN104852163A (en) * | 2015-05-27 | 2015-08-19 | 国网山东济南市长清区供电公司 | Assembly type cable connector |
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2016
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05234775A (en) * | 1992-02-24 | 1993-09-10 | Toshiba Corp | Lead conductor connection structure for transformer |
| CN1279815A (en) * | 1997-11-27 | 2001-01-10 | Abb股份有限公司 | Power transformer/reactor |
| JP2007227267A (en) * | 2006-02-24 | 2007-09-06 | Chugoku Electric Power Co Inc:The | Coaxial cable connector, and coaxial cable and cable connecting clamp provided therewith |
| 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 |
| CN101118988A (en) * | 2006-08-02 | 2008-02-06 | 浙江开关厂有限公司 | Conductor connector for high-voltage switch cabinet |
| CN102856677A (en) * | 2011-06-27 | 2013-01-02 | 泰科电子(上海)有限公司 | Electric connecting device |
| CN202268489U (en) * | 2011-08-11 | 2012-06-06 | 泰科电子(上海)有限公司 | Electrical connection assembly |
| CN203179814U (en) * | 2013-03-08 | 2013-09-04 | Abb技术有限公司 | Connecting device between middling pressure breaker contact arm and solid-sealed polar pole |
| CN203983533U (en) * | 2014-07-31 | 2014-12-03 | 西安神电高压电器有限公司 | A kind of jockey |
| CN104852163A (en) * | 2015-05-27 | 2015-08-19 | 国网山东济南市长清区供电公司 | Assembly type cable connector |
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