CN106057446A - Oil-immersed power transformer - Google Patents
Oil-immersed power transformer Download PDFInfo
- Publication number
- CN106057446A CN106057446A CN201610351944.2A CN201610351944A CN106057446A CN 106057446 A CN106057446 A CN 106057446A CN 201610351944 A CN201610351944 A CN 201610351944A CN 106057446 A CN106057446 A CN 106057446A
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- China
- Prior art keywords
- columnar part
- low
- voltage output
- oil
- connecting column
- Prior art date
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Classifications
-
- 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
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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
- H02G5/007—Butt joining of bus-bars by means of a common bolt, e.g. splice joint
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/01—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the form or arrangement of the conductive interconnection between the connecting locations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/03—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations
- H01R11/09—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations the connecting locations being identical
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R25/00—Coupling parts adapted for simultaneous co-operation with two or more identical counterparts, e.g. for distributing energy to two or more circuits
- H01R25/14—Rails or bus-bars constructed so that the counterparts can be connected thereto at any point along their length
- H01R25/145—Details, e.g. end pieces or joints
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
- H01R11/28—End pieces consisting of a ferrule or sleeve
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/36—Conductive members located under tip of screw
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
The invention discloses an oil-immersed power transformer, belongs to the field of power equipment and particularly relates to the oil-immersed power transformer. A coupling column is arranged at a low-voltage output end of the oil-immersed power transformer; the coupling column is partially embedded into the low-voltage output end and is in interference fit with the low-voltage output end; the coupling column is provided with a conducting first columnar part in interference fit with a power bus; a second columnar part with conductivity is coaxially arranged in the first columnar part; the first columnar part and the second columnar part are in interference fit; and the thermal expansion coefficient of the second columnar part is greater than that of the first columnar part. The transformer disclosed by the invention has the beneficial effects that (1) more conducting area is generated by the same overlapping length, so that the current density is reduced and a low temperature rise of the low-voltage output end is achieved; (2) the usage amount of the bus is reduced and resources are saved; and (3) the electric clearance or the safety distance is increased and the electric safety of equipment is improved.
Description
Technical field
The present invention relates to field of electrical equipment, be specifically related to a kind of oil-immersed power transformer.
Background technology
In the power distribution room of factory, oil-filled transformer low-voltage output generally uses power bus-bar directly to couple, electric power
Busbar is directly overlapped on low-voltage output, and low-voltage output couples the generally overlapping splicing processes of employing with power bus-bar, the most again
Fasten with bolt.Such as the upper semisection of Fig. 8, such coupling method needs overlapping with outfan for busbar certain length, so that contact
The electric current density in face 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 drop
Low, finally make connection place have relatively low temperature rise.And increase overlap length and can strengthen the consumption of busbar, and then increase is manufactured into
This.The bolt of fastening can make the electric clearance between conductive component and non conductive component or safe distance reduce, in order to make electricity
Gas gap or safe distance keep constant, need to strengthen the spacing between outfan and non conductive component, and strengthen spacing must
Transformator is so caused 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, with
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 a kind of oil-immersed power transformer is provided.
To this end, the present invention provides a kind of oil-immersed power transformer, its have high pressure winding, low pressure winding, ferromagnetic core and
Fuel tank, high pressure winding and low pressure winding are coaxially disposed and are passed by ferromagnetic core, and high pressure winding, low pressure winding and ferromagnetic core are positioned at oil
In case, high pressure winding is provided with high voltage input terminal, and low pressure winding is provided with low-voltage output, high voltage input terminal and low-voltage output
It is positioned at outside fuel tank.Low-voltage output is provided with connecting column, connecting column be partially submerged into low-voltage output and with low-voltage output interference
Coordinating, connecting column is provided with and the first columnar part of the pre-manufactured hole interference fit on power bus-bar, and the first columnar part has conduction
Property, the first columnar part is coaxially disposed second columnar part with electric conductivity, the first columnar part and the second columnar part interference fit, the
Two columnar part are positioned at inside the first columnar part, and the coefficient of thermal expansion of the second columnar part is more than the coefficient of thermal expansion of the first columnar part.
Advantageously, the resistivity of the second columnar part is more than the resistivity of the first columnar part.
Specifically, the material of the second columnar part is aluminum or aluminium alloy, and the material of the first columnar part is copper or copper alloy.
Preferably, the ratio of the external diameter of the external diameter of the second columnar part and the first columnar part is 0.5-0.8.
Specifically, the second columnar part has solid construction, and the first columnar part has the structure of hollow, and the second columnar part runs through
First columnar part.
Advantageously, being coaxially arranged with the second through hole inside connecting column, the outer cylinder of connecting column is radially arranged first to be run through
Hole, the first through hole and the connection of the second through hole, the first through hole is positioned at the axial middle part of connecting column.
Beneficial effect
Owing to the low-voltage output of oil-immersed power transformer disclosed by the invention uses connecting mode and the power bus-bar of docking
Coupling, relative to existing overlapping overlapping mode, it can bring following beneficial effect.
The most identical lap of splice produces more conductive area, and then reduces electric current density, it is achieved the low temperature of connection place
Rise.
2., without busbar being carried out overlapping overlap joint, reducing the consumption of busbar, having saved resource.
3., owing to eliminating fastening bolt and nut, so increasing electric clearance or safe distance, improve equipment
Electrical security.
4., owing to eliminating fastening bolt and nut, so the distance between connection place and non conductive component becomes big, and become
Taking up room of depressor does not increase.
Accompanying drawing explanation
In explanation below in reference to the accompanying drawing embodiment to being given 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 oil-immersed power transformer, and wherein power bus-bar overlaps；
Fig. 2 is the partial enlarged drawing in Fig. 1 at A；
Fig. 3 is the axonometric chart of oil-immersed power transformer disclosed by the invention, and wherein power bus-bar is to connecting；
Fig. 4 is the partial enlarged drawing in Fig. 3 at B；
Fig. 5 is the axonometric chart of oil-immersed power transformer disclosed by the invention；
Fig. 6 is the partial enlarged drawing in Fig. 5 at C；
Fig. 7 is the exploded partial perspective view of the low-voltage output position of Fig. 3；
Fig. 8 is size comparison's figure of existing power bus-bar overlapping mode and power bus-bar docking mode disclosed by the invention；
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 it is shown in figure 1, be the low-voltage output connecting mode with power bus-bar of existing oil-immersed power transformer, use
Connecting mode be overlapping overlapping mode, after power bus-bar and low-voltage output overlap certain length, then use screw bolt and nut
The two being fastened, such connecting mode is defined as overlap joint, as shown in Figure 2.
As it is shown in figure 5, be oil-immersed power transformer disclosed by the invention, it has high pressure winding, low pressure winding, ferromagnetic
Core and fuel tank, high pressure winding and low pressure winding are coaxially disposed and are passed by ferromagnetic core, high pressure winding, low pressure winding and ferromagnetic core position
In fuel tank, high pressure winding is provided with high voltage input terminal, and it is defeated that low pressure winding is provided with low-voltage output, high voltage input terminal and low pressure
Go out end to be positioned at outside fuel tank.
As shown in Figure 6, low-voltage output is provided with connecting column, and connecting column is partially submerged into low-voltage output and exports with low pressure
End interference fit, embedded length is the half of connecting column length, and the lower half of connecting column embeds low-voltage output, low-voltage output
Connecting column is coupled by the pin in front with the fastening of both low-voltage outputs.
As shown in Figure 3-4, the connecting column that the pre-manufactured hole on power bus-bar is inserted on low-voltage output, power bus-bar and connection
Connecing post interference fit, the end face laminating of the end face of power bus-bar and low-voltage output, the pin in power bus-bar front is by connecting column
Coupling with the fastening of both power bus-bars, such connecting mode is defined as docking.
As shown in Figure 8, it is the size of existing power bus-bar overlapping mode and power bus-bar docking mode disclosed by the invention
Comparison diagram, the first half is the low-voltage output overlapping mode with power bus-bar of existing oil-immersed power transformer, and lower half is
The low-voltage output of oil-immersed power transformer disclosed by the invention and the docking mode of power bus-bar, 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, this
The connecting mode of disclosure of the invention is set directly at the lower section of existing connecting mode.Two kinds of connecting modes the lap of splice the same,
It is all L5, is presented as: the power bus-bar under existing connecting mode is L5 with the overlap length of low-voltage output, disclosed by the invention
The length of the connecting column under connecting mode is also L5.The directly perceived change that two kinds of connecting modes bring is exactly the obvious change of relative dimensions
Changing, L1 is the electric clearance under existing connecting mode or safe distance, and L2 is electric under connecting mode disclosed by the invention
Gap or safe distance, L3 is that the connection place under existing connecting mode takies width, and L4 is connecting mode disclosed by the invention
Under connection place take width.Can visually see from figure: L2 is significantly greater than L1, the size of increase is about busbar thickness
Add the height of nut to add bolt tail and highlight the height of nut.L4 is significantly less than L3, and the size of reduction about busbar thickness adds
Bolt head height adds height of nut and adds bolt tail and highlight the height of nut.Therefore, (electric to the factor that power equipment is favourable
Gap or safe distance) it is improved, and factor disadvantageous to power equipment (taking up room) is reduced.
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 convenient dress
The chamfering joined.
As shown in Figure 10, the second columnar part 2, the first columnar part 1 and the second columnar part 2 it are coaxially disposed in the first columnar part 1
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 second
The ratio of the external diameter of 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,
The coefficient of thermal expansion of the second columnar part 2 is more than the first post more than the coefficient of thermal expansion of the first columnar part 1, the resistivity of the second columnar part 2
The resistivity in shape portion 1.
After connecting column is assemblied in low-voltage output and power bus-bar, due to the first columnar part 1 and low-voltage output and mother
The pre-manufactured hole interference fit of row, so, the first columnar part 1 and low-voltage output and busbar fit tightly, the first post of connecting column
Shape portion 1 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
Two columnar part 2 also fit tightly, and the second columnar part 2 the most fully carries electric current.Therefore, the first columnar part 1 and the second columnar part 2
Heat effect 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 second post
The temperature in shape portion 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 flatulence of heat type system of the first columnar part 1
Number, therefore, in the case of temperature and coefficient of thermal expansion are the most 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 to the first columnar part 1
Apply radially outer pressure, thus make the radial dimension of the first columnar part 1 the most outwards become greatly, ultimately result in the first columnar part 1
More fit tightly with the pre-manufactured hole of low-voltage output and power bus-bar, the most also provide radially outer pressure to pre-manufactured hole, i.e.
Pressure ratio connecting column between connecting column and low-voltage output and busbar is bigger when just assembling, and increasing contact pressure can also make
The temperature rise of contact site reduces.
As can be seen here, the coupling of interference fit, the coupling of resistivity and the coefficient of thermal expansion between each feature is to reducing low pressure
Outfan has obvious action with the temperature rise of busbar connection place, and the effect between three is complementary, interference originally
Coordinate and make resistivity and coefficient of thermal expansion have the basis played a role, and the effect that resistivity and coefficient of thermal expansion produce is aggravated
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,
Pre-manufactured hole circumference is R to the distance of bus bar edge, and busbar width is L6.When using existing overlapping splicing processes to couple, connection place
Conductive area be
S1=L6xL5=(R+2R+R) xL5=4RxL5(L5 is the lap of splice, as shown in Figure 8)
And when using connecting column to couple, the conductive area of connection place is
S2=2πRxL5
Therefore,
S2: S1=2πR: 4R=π/2≈1.57
So, use the mode of connecting column overlap joint can obtain more contact area.Obviously, the condition of mechanical strength is being met
Under, 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, in advance
Drilling circumference is R to the distance of bus bar edge, and the beeline between each hole is R, and busbar width is L6.When using existing overlap
When splicing processes couples,
The conductive area of connection place is
S1=L6xL5=(4R+3x2R)xL5=10RxL5
And when using connecting column to couple, the conductive area of connection place is
S2=3x2πRxL5=6πRxL5
Therefore,
S2: S1=6πR: 10R=3π/5≈1.884
So, use the mode of connecting column overlap joint can obtain more contact area.Obviously, the condition of mechanical strength is being met
Under, 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, and two
Being to have increased considerably conductive area, under the common effect of the two active factor, the temperature rise of connection place is greatly lowered, real
Show the purpose of the present invention.
As it is shown in fig. 7, the low-voltage output of oil-immersed power transformer disclosed by the invention, the first columnar part of connecting column
The material of 1 is copper, and the material of the second columnar part 2 is aluminum.Before connecting column is assemblied in low-voltage output, first at low-voltage output
End face 5 processes 3 pre-manufactured holes receiving connecting column along the length direction of outfan, and the diameter of pre-manufactured hole is slightly less than outside connecting column
Footpath, 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, prefabricated
After hole machined is good, the half length of connecting column is inserted in pre-manufactured hole, makes the first through hole in the middle part of connecting column be in end face 5
Place, vertically processes the through hole for assembling pin, makes through hole run through the front 3 of low-voltage output from the front 3 of low-voltage output
With the back side 4, and run through connecting column simultaneously, the axis of through hole and the axes intersect of connecting column, by pin by low-voltage output and
The fastening of both connecting columns couples.
Before power bus-bar is assemblied in low-voltage output, first the end face 5 at power bus-bar processes 3 along busbar length direction
Pre-manufactured hole, 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；Prefabricated
The degree of depth in the hole connecting column length slightly larger than 0.5 times, after pre-manufactured hole processes, is inserted in low pressure by the pre-manufactured hole on power bus-bar defeated
Go out the connecting column revealed on end, fit, from power bus-bar with the end face 5 of low-voltage output until the end face 5 of power bus-bar
Front 3 vertically process for assembling the through hole of pin, make through hole run through front 3 and the back side 4 of power bus-bar, and run through simultaneously
Connecting column, the axis of through hole and the axes intersect of connecting column, coupled the fastening of both power bus-bar and connecting column by pin,
The fastening achieving power bus-bar and low-voltage output eventually couples.
After low-voltage output and power bus-bar docking, make connecting column and pre-manufactured hole matched in clearance in the axial direction, the lowest
Being close to of the end face of the pressure end face of outfan and power bus-bar, the head of pre-manufactured hole is machined with the chamfering of convenient installation.Due to hole
With pin interference fit, after pin assembling puts in place, low-voltage output and mutual the moving axially of power bus-bar can be limited,
Making low-voltage output, connecting column, power bus-bar eventually, pin firmly couples together.
As shown in figure 14, in order to distinguish each face of busbar and low-voltage output, end face 5 be defined as with busbar (or
Low-voltage output) thickness and width composition face, i.e. in Figure 14 identify 5 face.Front and back be defined as with busbar (or
Person's low-voltage output) width and length composition face, i.e. in figure identify 3,4 face, 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, and the first columnar part 6 has hollow
Structure, the second columnar part 2 runs through the first columnar part 1, and the outer cylinder of the first columnar part 1 is radially arranged the first through hole 6, and first passes through
Perforation 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 so that connecting column insert low-voltage output pre-manufactured hole during, pre-manufactured hole
In air can successfully discharge from the second through hole 7, and then connecting column can successfully be assembled put in place, when electric power is female
When row is inserted in already installed connecting column, the air in the pre-manufactured hole of power bus-bar can be smoothly through the second through hole 7
Discharge from the first through hole 6, and then the second busbar can be assembled smoothly put in place.
Embodiment two
The material of the first columnar part 1 in embodiment one is changed to copper alloy, and the material of the second columnar part 2 changes to aluminum and closes
Gold, owing to the hardness of alloy is more relatively high, first can preserve a period of time (5 points under low temperature environment (5 degree) by the second columnar part 2
Clock), 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, can make
The internal diameter of the first columnar part 1 slightly becomes big, and the external diameter of the first columnar part 1 slightly diminishes, and then easily by the second columnar part 2
Being assembled in the first columnar part 1, after the connecting column prepared to be installed recovers room temperature, the first columnar part 1 and the second columnar part 2 can be real
Existing interference fit.The diameter of connecting column disclosed by the invention and length have different size specification, to adapt to different busbar size
Or the needs of low-voltage output size.
Claims (6)
1. an oil-immersed power transformer, it has high pressure winding, low pressure winding, ferromagnetic core and a fuel tank, high pressure winding and low
Pressure winding is coaxially disposed and is passed by ferromagnetic core, and high pressure winding, low pressure winding and ferromagnetic core are positioned at fuel tank, and high pressure winding is arranged
Have high voltage input terminal, low pressure winding to be provided with low-voltage output, high voltage input terminal and low-voltage output to be positioned at outside fuel tank；Its feature
Being, low-voltage output is provided with connecting column, connecting column be partially submerged into low-voltage output and with low-voltage output interference fit, connection
Connecing post and be provided with first columnar part (1) of the conduction with power bus-bar interference fit, the first columnar part (1) is coaxially disposed to have to be led
Electrical the second columnar part (2), the first columnar part (1) and the second columnar part (2) interference fit, the second columnar part (2) is positioned at the
One columnar part (1) is internal, 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).
A kind of oil-immersed power transformer the most according to claim 1, it is characterised in that described the second columnar part (2)
Resistivity more than the resistivity of the first columnar part (1).
A kind of oil-immersed power transformer the most according to claim 2, it is characterised in that described the second columnar part (2)
Material be aluminum or aluminium alloy, the material of the first columnar part (1) is copper or copper alloy.
A kind of oil-immersed power transformer the most according to claim 1, it is characterised in that described the second columnar part (2)
External diameter and the ratio of external diameter of the first columnar part (1) be 0.5-0.8.
A kind of oil-immersed power transformer the most according to claim 4, it is characterised in that the second columnar part (2) has reality
Core structure, the first columnar part (1) has hollow structure, and the second columnar part (2) runs through the first columnar part (1).
A kind of oil-immersed power transformer the most according to claim 4, it is characterised in that be coaxially arranged with inside connecting column
Second through hole (7), the outer cylinder of connecting column is radially arranged the first through hole (6), the first through hole (7) and the second through hole
(6) connection, the first through hole (6) is positioned at the axial middle part of connecting column.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351944.2A CN106057446A (en) | 2016-05-24 | 2016-05-24 | Oil-immersed power transformer |
| GB1703936.3A GB2550647A (en) | 2016-05-24 | 2017-03-13 | Oil-filled transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351944.2A CN106057446A (en) | 2016-05-24 | 2016-05-24 | Oil-immersed power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106057446A true CN106057446A (en) | 2016-10-26 |
Family
ID=57174310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610351944.2A Pending CN106057446A (en) | 2016-05-24 | 2016-05-24 | Oil-immersed power transformer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106057446A (en) |
| GB (1) | GB2550647A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113963900B (en) * | 2021-12-03 | 2022-05-27 | 华夏恒业变压器有限公司 | Oil-immersed transformer |
Citations (7)
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| JPH05234755A (en) * | 1992-02-20 | 1993-09-10 | Murata Mfg Co Ltd | Electronic part |
| 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 |
| CN201478088U (en) * | 2009-08-13 | 2010-05-19 | 上海置信电气股份有限公司 | Amorphous alloy 35kV oil immersed type transformer for solar power generation |
| CN202268489U (en) * | 2011-08-11 | 2012-06-06 | 泰科电子(上海)有限公司 | Electrical connection assembly |
| CN102856677A (en) * | 2011-06-27 | 2013-01-02 | 泰科电子(上海)有限公司 | Electric connecting device |
| CN102930964A (en) * | 2012-10-12 | 2013-02-13 | 沈阳昊诚电气股份有限公司 | Three-phase on-load capacitance-tuning transformer |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201937220U (en) * | 2011-01-21 | 2011-08-17 | 山东电力集团公司淄博供电公司 | High-voltage insulating bus connecting device |
| CN105788988A (en) * | 2016-05-24 | 2016-07-20 | 龚雅丽 | Design method of disconnecting switch fuse achieving side operation |
-
2016
- 2016-05-24 CN CN201610351944.2A patent/CN106057446A/en active Pending
-
2017
- 2017-03-13 GB GB1703936.3A patent/GB2550647A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05234755A (en) * | 1992-02-20 | 1993-09-10 | Murata Mfg Co Ltd | Electronic part |
| 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 |
| CN201478088U (en) * | 2009-08-13 | 2010-05-19 | 上海置信电气股份有限公司 | Amorphous alloy 35kV oil immersed type transformer for solar power generation |
| 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 |
| CN102930964A (en) * | 2012-10-12 | 2013-02-13 | 沈阳昊诚电气股份有限公司 | Three-phase on-load capacitance-tuning transformer |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2550647A (en) | 2017-11-29 |
| GB201703936D0 (en) | 2017-04-26 |
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