CN209133313U - A kind of close-coupled low-voltage current mutual inductor - Google Patents
A kind of close-coupled low-voltage current mutual inductor Download PDFInfo
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- CN209133313U CN209133313U CN201822188600.1U CN201822188600U CN209133313U CN 209133313 U CN209133313 U CN 209133313U CN 201822188600 U CN201822188600 U CN 201822188600U CN 209133313 U CN209133313 U CN 209133313U
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Abstract
The utility model discloses a kind of close-coupled low-voltage current mutual inductors, it is related to current transformer field, including a minor metal row, iron core, secondary winding and shell, secondary winding is wrapped on iron core, the both ends of secondary winding are provided with access head, iron core has centre bore, one minor metal row passes through from centre bore, one minor metal row is made of conductive sheet metal, the two sides of one minor metal row are provided with wiring holes, air gap is provided on conductive sheet metal, iron core is set to interior of shell, and access head is pierced by the shell.Beneficial effect is: by forming minor metal row by the conductive sheet metal of air gap, convenient for increasing minor metal row's surface area so that minor metal isostere product becomes smaller under the premise of same overcurrent, and air gap is conducive to the heat dissipation of minor metal row, secondly, the core center hole is slightly larger than the sectional area of minor metal row, compact-sized, the disadvantage big to volume existing for routine transformer, precision is low is preferably improved and is made up.
Description
Technical field
The utility model relates to current transformer fields, and in particular to a kind of close-coupled low-voltage current mutual inductor.
Background technique
Current transformer is that primary side high current is converted into secondary side low current to carry out electricity according to electromagnetic induction principle
The equipment of gas measurement.The structure of current transformer is relatively simple, by the first winding of mutually insulated, secondary winding, iron core and
The composition such as framework, shell, connecting terminal.Its working principle and transformer are essentially identical, and the number of turns of first winding is less, directly go here and there
It is coupled in power circuit, when one time load current passes through first winding, the alternating flux induction of generation, which generates, to be scaled down
Secondary current；The number of turns of secondary winding is more, connects to be formed with the secondary load of the current coils such as instrument, relay, transmitter
Closed circuit.Electric energy quality monitoring, current measurement, ammeter measuring when being commonly used in day-to-day operation currently on the market etc.
Low-voltage current mutual inductor is generally punching.To adapt to different conductor line footpath or geomery, the generally reserved circular hole in center
Or the form of square hole；It is straight that a kind of leakage circuit breakers use is disclosed in the patent (application) of number of patent application " 201520811062.0 "
Flow-through zero sequence transformer, primary side therein use copper bar, and due to the presence of skin effect, primary side heat dissipation performance is bad, need
The biggish copper bar of volume is used, the increase of mutual inductor volume and cost is bound to cause；Number of patent application
A kind of connecting wire for intermediate frequency power supply current transformer and equipment is described in the patent of " 201110449381.8 ", this is led
Line is connected between the second siding ring of the mutual inductor and the equipment, and the conducting wire includes conductor and covers the shield outside conductor
Set causes volume to increase, needs to increase biggish installation space from attached drawing it can be seen that core interior gap increases, opposite to leak
The quantity of magnetism is big, and magnetic resistance is big, and measurement accuracy is caused to reduce.
Utility model content
The purpose of this utility model is that solve the above-mentioned problems and provides a kind of close-coupled low-voltage current mutual inductor.
The utility model achieves the above object through the following technical schemes:
A kind of close-coupled low-voltage current mutual inductor, including minor metal row, iron core, secondary winding and shell, the iron core
On be wrapped with the secondary winding, the both ends of the secondary winding are provided with access head, and the iron core has a centre bore, described one
Minor metal row passes through from the centre bore, and the minor metal row is made of conductive sheet metal, and the two of the minor metal row
Side is provided with wiring holes, and air gap is provided on the conductive sheet metal, and the iron core is set to the interior of shell, the access
Head is pierced by the shell.
Further, the iron core, minor metal row and the secondary winding are respectively one.
Further, the iron core, minor metal row and the secondary winding are respectively three, and three described primary
Metal arranges the centre bore for being each passed through three iron cores, and three secondary windings are around in respectively on three iron cores.
It further, further include an insulating trip, the minor metal row is two, and the insulating trip is located at the center
In hole and it is located between two minor metal rows, two minor metal rows is separated.
It further, further include two insulating trips, the minor metal row is three, and two insulating trips are located at center
It in hole and is located at three minor metal rows between any two, three minor metal rows is separated two-by-two.
It further, further include three insulating trips, the minor metal row is four, and three insulating trips are located at
Between any two, four minor metal rows are separated two-by-two by four minor metal rows.
Further, the iron core is iron core-closed, and shape is rectangular, round or oval.
Further, the minor metal row is formed by stacking by the conductive sheet metal more than or equal to two, institute
State one kind that conductive sheet metal is sheet copper, thin silver plate and thin golden plate or thin alloy sheets.
Further, the core center hole is slightly larger than the sectional area of minor metal row.
Further, the shape of the air gap on the conductive sheet metal include rectangular, semicircle, half elliptic or
Wavy one or more, the size of the centre bore be 1.05 times of the sectional area arranged across its a minor metal extremely
1.1 again.
Beneficial effect is: the close-coupled low-voltage current mutual inductor of the utility model, by there is the conductive metal of air gap thin
Board group is arranged at a minor metal, convenient for increasing minor metal row's surface area so that a minor metal isostere under the premise of same overcurrent
Product becomes smaller, and air gap is conducive to the heat dissipation of minor metal row, secondly, the core center hole cutting slightly larger than minor metal row
Area, compact-sized, the disadvantage big to volume existing for routine transformer, precision is low is preferably improved and is made up.
Detailed description of the invention
Fig. 1 is a kind of perspective view of close-coupled low-voltage current mutual inductor embodiment 1 described in the utility model；
Fig. 2 is a kind of the transversal of the minor metal row of close-coupled low-voltage current mutual inductor embodiment 1 described in the utility model
Face figure；
Fig. 3 is that an a kind of minor metal of close-coupled low-voltage current mutual inductor embodiment 1 described in the utility model is arranged across iron
The schematic diagram of core；
Fig. 4 is a kind of perspective view of close-coupled low-voltage current mutual inductor embodiment 2 described in the utility model；
Fig. 5 is that an a kind of minor metal of close-coupled low-voltage current mutual inductor embodiment 2 described in the utility model is arranged across iron
The schematic diagram of core；
Fig. 6 is a kind of perspective view of close-coupled low-voltage current mutual inductor embodiment 3 described in the utility model；
Fig. 7 is that an a kind of minor metal of close-coupled low-voltage current mutual inductor embodiment 3 described in the utility model is arranged across iron
The schematic diagram of core；
Fig. 8 is a kind of perspective view of close-coupled low-voltage current mutual inductor embodiment 4 described in the utility model；
Fig. 9 is that an a kind of minor metal of close-coupled low-voltage current mutual inductor embodiment 4 described in the utility model is arranged across iron
The schematic diagram of core；
Figure 10 is a kind of perspective view of close-coupled low-voltage current mutual inductor embodiment 5 described in the utility model；
Figure 11 is that an a kind of minor metal of close-coupled low-voltage current mutual inductor embodiment 5 described in the utility model is arranged across iron
The schematic diagram of core；
The reference numerals are as follows:
1, shell；2, a minor metal is arranged；3, wiring holes；4, conductive sheet metal；5, air gap；6, iron core；7, head is accessed；8,
Secondary winding；9, centre bore；10, insulating trip.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing:
Embodiment 1
As shown in Figure 1-Figure 3, a kind of close-coupled low-voltage current mutual inductor, including a minor metal arrange 2, iron core 6, secondary winding
8 and shell 1, secondary winding 8 is wrapped on iron core 6, and the both ends of secondary winding 8 are provided with access head 7, and iron core 6 has centre bore
9, minor metal row 2 passes through from centre bore 9, and minor metal row 2 is made of conductive sheet metal 4, and the two sides of minor metal row 2 are set
It is equipped with wiring holes 3, iron core 6 is set to inside shell 1, and access head 7 is pierced by 1 (not shown) of shell.
In the present embodiment, iron core 6 is iron core-closed, and shape is rectangular, round or oval one kind, above-mentioned shape
Shape is convenient for the solderless wrapped connection of secondary winding 8.
In the present embodiment, the shape of the air gap 5 on conductive sheet metal 4 is including but not limited to rectangular, semicircle, half ellipse
Round or wavy one kind, multi-disc is superimposed with the conductive sheet metal 4 of air gap 5 constitutes minor metal row 2, air gap
5 presence has the surface area for being conducive to increase conductive sheet metal 4, is to the skin effect that becomes to increase the surface area of minor metal row 2
Answer that (when having alternating current or alternating electromagnetic field in conductor, the current distribution is uneven of conductor is even, and current convergence is in conductor
" skin " part, that is to say, that current convergence is in the thin layer of conductor appearance, and closer to conductive surface, current density is bigger, conducting wire
Internal actually electric current is smaller.As a result increase the resistance of conductor, increase its loss power also, this phenomenon is known as becoming skin
Effect) characteristic utilization, make with a prismatic minor metal arrange 2, current-carrying capacity (holding current-carrying ability) has obtained effectively mentioning
Height, so as to use a minor metal of smaller size smaller to arrange 2.It in addition, minor metal row 2 has electric current to flow through, will generate heat, send out
The formula of heat is Q=I2(Q is heat to RT, and I is by the electric current of minor metal row 2, and R is the resistance value of minor metal row 2, and T is
The duration of 2 electric currents is arranged by a minor metal).It will be apparent that at present superconductor material can't large area use the case where
Under, R value be can not be zero, that is to say, that generate heat be inevitable.The presence of air gap 5 provides cross-ventilated logical
Distributing for 2 heats is arranged convenient for accelerating a minor metal in road, is conducive to radiate.
In the present embodiment, secondary winding 8 is enameled wire, in the solderless wrapped connection in addition to accessing head 7 outside the conducting wire of 6 part of iron core
It is covered with insulating paint, convenient for ensureing that secondary winding 8 in the insulating properties of the part of solderless wrapped connection, avoids having between secondary winding 8 and iron core 6
Direct electric current transmitting.
In the present embodiment, conductive sheet metal 4 including but not limited to sheet copper, thin silver plate, thin golden plate, thin alloy sheets with
And one kind of the preferable thin plate of other electric conductivities, copper is the higher conductor material of cost performance at present, so usually using thin copper
The plate one action electric current whole convenient for 2 carrying of minor metal row.
In the present embodiment, cross section of the size of the centre bore 9 of iron core 6 slightly larger than minor metal row 2, it is preferable that in
The size in heart hole 9 is 1.05 times to 1.1 times of the sectional area of minor metal row 2.
In the present embodiment, it is preformed hole, the quantity in hole and diameter by carrying that a minor metal, which arranges the connecting hole 3 of 2 two sides,
Electric current and the comprehensive decision of connection type.
The close-coupled low-voltage current mutual inductor of the present embodiment is being used for detecting the firewire or neutral line current of single-phase electricity
In, in the firewire or zero curve of 2 access single-phase electricity of minor metal row.
Embodiment 2
As illustrated in figures 4-5, a kind of close-coupled low-voltage current mutual inductor, including a minor metal arrange 2, iron core 6, secondary winding 8
With shell 1, the present embodiment the difference from embodiment 1 is that setting there are three a minor metal arrange 2, three iron core 6, three it is secondary around
Group, three groups of access heads 7, each iron core 6 are respectively arranged with a centre bore 9, and three minor metal rows 2 are respectively from three centers
Hole 9 passes through, three secondary windings are around in respectively on three iron cores 6, and three iron cores 6 are set in shell 1, and three groups of access heads 7 are pierced by
Shell 1 (is not shown) in Fig. 4.The close-coupled low-voltage current mutual inductor of the present embodiment, for detecting the electric current of three-phase electricity.
Embodiment 3
As shown in fig. 6-7, a kind of close-coupled low-voltage current mutual inductor, including a minor metal arrange 2, iron core 6, secondary winding 8
With shell 1, the present embodiment the difference from embodiment 1 is that setting there are two a minor metal row 2, and be equipped with an insulating trip 10,
Two minor metal rows 2 both pass through centre bore 9, and insulating trip 10 is located in centre bore 9 and is located between two minor metal rows 2,
Two minor metal rows 2 are separated, so that mutually insulated between two minor metal rows 2.
In the present embodiment, insulating trip 10 can also be replaced with insulating cement or other substances to insulate.
The close-coupled low-voltage current mutual inductor of the present embodiment, for detecting the electricity of the zero sequence between single-phase electricity zero curve and firewire
Stream, in use, two minor metal rows 2 are respectively connected in the firewire and zero curve of single-phase electricity.
Embodiment 4
As Figure 8-9, a kind of close-coupled low-voltage current mutual inductor, including a minor metal arrange 2, iron core 6, secondary winding 8
With shell 1, the difference of the present embodiment and embodiment 3 is setting, and there are three minor metal rows 2, and set there are two insulating trip 10,
Three minor metal rows 2 both pass through centre bore 9, and two insulating trips 10 are located in centre bore 9 and are located at three minor metals
Between any two, three minor metal rows 2 are separated two-by-two by row 2, so that mutually insulated between three minor metal rows 2.
In the present embodiment, two insulating trips 10 can also be replaced with insulating cement or other substances to insulate.
The close-coupled low-voltage current mutual inductor of the present embodiment makes for detecting the zero-sequence current between phase three-wire three electricity
In, three minor metal rows 2 are respectively connected in each phase of three-phase electricity.
Embodiment 5
As shown in figs. 10-11, a kind of close-coupled low-voltage current mutual inductor, including a minor metal arrange 2, iron core 6, secondary winding
8 and shell 1, the difference of the present embodiment and embodiment 4 is to be arranged that there are four minor metal rows 2, and sets there are three insulating trip 10,
Four minor metal rows 2 both pass through centre bore 9, and three insulating trips 10 are located in centre bore 9 and are located at four minor metals
Between any two, four minor metal rows 2 are separated two-by-two by row 2, so that mutually insulated between four minor metal rows 2.
In the present embodiment, three insulating trips 10 can also be replaced with insulating cement or other substances to insulate.
The close-coupled low-voltage current mutual inductor of the present embodiment makes for detecting the zero-sequence current between three-phase and four-line electricity
In, four minor metal rows 2 are respectively connected in each phase and zero curve of three-phase electricity.
The basic principles and main features and advantage of the utility model have been shown and described above.The technical staff of the industry
It should be appreciated that the present utility model is not limited to the above embodiments, the above embodiments and description only describe this
The principle of utility model, on the premise of not departing from the spirit and scope of the utility model, the utility model also has various change
And improvement, these various changes and improvements fall within the scope of the claimed invention.The utility model requires protection scope
It is defined by appending claims and equivalents.
Claims (10)
1. a kind of close-coupled low-voltage current mutual inductor, including minor metal row, iron core, secondary winding and shell, on the iron core
It is wrapped with the secondary winding, the both ends of the secondary winding are provided with access head, and the iron core has centre bore, described primary
Metal row passes through from the centre bore, which is characterized in that the minor metal row is made of conductive sheet metal, the primary gold
The two sides for belonging to row are provided with wiring holes, and air gap is provided on the conductive sheet metal, and the iron core is set to the interior of shell,
The access head is pierced by the shell.
2. a kind of close-coupled low-voltage current mutual inductor according to claim 1, it is characterised in that: the iron core, described one
Minor metal row and the secondary winding are respectively one.
3. a kind of close-coupled low-voltage current mutual inductor according to claim 1, it is characterised in that: the iron core, described one
Minor metal row and the secondary winding are respectively three, and three minor metal rows are each passed through the center of three iron cores
Hole, three secondary windings are around in respectively on three iron cores.
4. a kind of close-coupled low-voltage current mutual inductor according to claim 1, it is characterised in that: further include an insulation
Piece, the minor metal row is two, and the insulating trip, which is located in the centre bore and is located at two minor metals, arranges it
Between, two minor metal rows are separated.
5. a kind of close-coupled low-voltage current mutual inductor according to claim 1, it is characterised in that: further include two insulation
Piece, the minor metal row is three, and two insulating trips are located in centre bore and are located at three minor metals
Between any two, three minor metal rows are separated two-by-two by row.
6. a kind of close-coupled low-voltage current mutual inductor according to claim 1, it is characterised in that: further include three insulation
Piece, the minor metal row is four, and three insulating trips are located at four minor metal rows between any two, by four
A minor metal row separates two-by-two.
7. a kind of close-coupled low-voltage current mutual inductor according to any one of claims 1 to 6, it is characterised in that: the iron
Core be it is iron core-closed, shape be it is rectangular, round or oval.
8. a kind of close-coupled low-voltage current mutual inductor according to any one of claims 1 to 6, it is characterised in that: described one
Minor metal row by being formed by stacking more than or equal to two conductive sheet metals, the conductive sheet metal be sheet copper,
One kind of thin silver plate and thin golden plate or thin alloy sheets.
9. a kind of close-coupled low-voltage current mutual inductor according to any one of claims 1 to 6, it is characterised in that: the iron
Core centre bore is slightly larger than the sectional area of minor metal row.
10. a kind of close-coupled low-voltage current mutual inductor according to claim 9, it is characterised in that: the conductive metal is thin
The shape of the air gap on plate includes rectangular, semicircle, half elliptic or wavy one or more, the centre bore
Size is 1.05 times to 1.1 times of the sectional area arranged across its a minor metal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822188600.1U CN209133313U (en) | 2018-12-25 | 2018-12-25 | A kind of close-coupled low-voltage current mutual inductor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822188600.1U CN209133313U (en) | 2018-12-25 | 2018-12-25 | A kind of close-coupled low-voltage current mutual inductor |
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| CN209133313U true CN209133313U (en) | 2019-07-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109411202A (en) * | 2018-12-25 | 2019-03-01 | 深圳市厚沃电气科技有限公司 | A kind of close-coupled low-voltage current mutual inductor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109411202A (en) * | 2018-12-25 | 2019-03-01 | 深圳市厚沃电气科技有限公司 | A kind of close-coupled low-voltage current mutual inductor |
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