CN209418293U - A kind of high-precision open mutual inductor - Google Patents
A kind of high-precision open mutual inductor Download PDFInfo
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- CN209418293U CN209418293U CN201920504881.9U CN201920504881U CN209418293U CN 209418293 U CN209418293 U CN 209418293U CN 201920504881 U CN201920504881 U CN 201920504881U CN 209418293 U CN209418293 U CN 209418293U
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Abstract
The utility model relates to transformer technical fields, especially a kind of high-precision open mutual inductor, including plastic casing, plastic lid, No.1 magnetic core, No. two magnetic cores, No. three magnetic cores, No. four magnetic cores, secondary coil and primary lead, wherein No.1 magnetic core, No. two magnetic cores, No. three magnetic cores and No. four magnetic cores are semicircle ring structure, No.1 magnetic core and No. two magnetic cores are disposed side by side on inside plastic casing, No. three magnetic cores and No. four magnetic cores are disposed side by side on inside plastic lid, when plastic casing and plastic lid cooperate, No.1 magnetic core and No. three magnetic cores cooperatively form the magnetic core of a cirque structure, No. two magnetic cores and No. four magnetic core cooperations also form the magnetic core of a cirque structure.A kind of obtained high-precision open mutual inductor of the utility model can effectively realize that bimag magnetic shunt path potential compensates, effectively control error, make control errors within 0.5%, phase difference Linear Control is within 2 points.
Description
Technical field
The utility model relates to transformer technical field, especially a kind of high-precision open mutual inductor.
Background technique
In the prior art, when electric current is 2%Ib-Imax, conventional current transformer is non-linear due to magnetic core, small electricity
It flows (2%Ib, 5%Ib) and high current (Imax) error is very big, and error change is also very big, leads to meter measurement error very
Greatly.
Utility model content
A kind of high-precision open mutual inductor is provided purpose of the utility model is to solve the deficiency of above-mentioned technology, energy
Realize the compensation of bimag magnetic shunt path potential to reduce measurement error.
In order to achieve the above object, a kind of high-precision open mutual inductor designed by the utility model, including plastic casing, modeling
Expect lid, No.1 magnetic core, No. two magnetic cores, No. three magnetic cores, No. four magnetic cores, secondary coil and primary lead, wherein No.1 magnetic core, No. two
Magnetic core, No. three magnetic cores and No. four magnetic cores are semicircle ring structure, and No.1 magnetic core and No. two magnetic cores are disposed side by side on inside plastic casing,
No. three magnetic cores and No. four magnetic cores are disposed side by side on inside plastic lid, when plastic casing and plastic lid cooperate, No.1 magnetic core and No. three
Magnetic core cooperatively forms the magnetic core of a cirque structure, and No. two magnetic cores and No. four magnetic core cooperations also form a cirque structure
Magnetic core, the form of the secondary coil are two kinds, wherein the first form are as follows: including being arranged in No.1 magnetic core, No. two magnetic cores, three
Four windings on number magnetic core and No. four magnetic cores, the head of winding and the head of the winding on No. three magnetic cores on No.1 magnetic core connect
A wherein secondary lead is used as after connecing, the tail portion of the winding on No.1 magnetic core is connect with the head of the winding on No. two magnetic cores,
The tail portion of winding on No. three magnetic cores is connect with the head of the winding on No. four magnetic cores, the tail portion and four of the winding on No. two magnetic cores
Another secondary lead is used as after the tail portion connection of winding on number magnetic core；Second of form of secondary coil are as follows: including respectively
No.1 magnetic core, two windings on No. two magnetic cores are set, and two windings on No.1 magnetic core are arranged in parallel, on No. two magnetic cores
Two windings are arranged in parallel, as a wherein secondary lead, No.1 magnetic core after the head connection of two windings on No.1 magnetic core
On head of the tail portions respectively with two on No. two magnetic cores windings of two windings be correspondingly connected with, two on No. two magnetic cores around
Another secondary lead is used as after the tail portion connection of resistance.
In above-mentioned technical proposal, the magnetic core of four semicircle ring structures is set inside plastic casing, plastic lid, and in plastics
The magnetic core of four semicircle ring structures forms the magnetic core of two circular ring shapes after box, plastic lid cooperation, and on magnetic core winding around
Resistance forms secondary coil, and No.1 magnetic core, No. two magnetic cores, No. three magnetic cores, the winding on No. four magnetic cores are designed by reasonable structure,
It can realize the compensation of magnetic shunt path potential, effectively so as to reduce measurement error.(more than conventional rectangular magnetic core magnetic circuit with round magnetic core
Short, performance is more preferable) it is symmetrical cut after, with half magnetic core loaded in plastic casing, around secondary coil (winding mode and principle such as Fig. 1,
Fig. 2 and Fig. 3), then the magnetic core section of incision is fitted closely together, because performance can decline much after magnetic core is cut,
Using bimag magnetic shunt path potential compensation way, make control errors within 0.5%, phase difference Linear Control is within 2 points.
The magnetic core fixed frame and the fixed lid of winding for fixing No.1 magnetic core and No. two magnetic cores, institute are provided in plastic casing
The No.1 magnetic core stated and No. two magnetic core settings are internally provided with bullet in plastic lid between magnetic core fixed frame and the fixed lid of winding
The fixed lid of piece and magnetic core, No. three magnetic cores and No. four magnetic cores settings between elastic slice and the fixed lid of magnetic core, plastic casing with
When plastic lid cooperates, No. three magnetic cores and No. four magnetic cores are pressed to No.1 magnetic core and No. two magnetic cores by elastic slice.Under the action of elastic slice, three
Number magnetic core, the stress of No. four magnetic cores are more stable, so that it is bonded stronger with No.1 magnetic core, No. two magnetic cores, have better
Good fatigue resistance still can restore original-shape after long-term stress deformation, substantially increase service life.
When secondary coil is second of form, winding is wound around No.1 magnetic core, the magnetic core outside No. two magnetic cores respectively
On fixed frame, No.1 magnetic core, No. two magnetic cores are threaded through respectively inside magnetic core fixed frame.Secondary coil is around on magnetic core fixed frame,
Pressure when two halves magnetic core is bonded acts on magnetic core fixed frame (conventional open mutual inductor acts on secondary coil) completely, and secondary
Coil is in vacant state, and does not stress, and this guarantees the stability of transformer error.
Bi-directional voltage stabilizing pipe is provided between two secondary leads, bi-directional voltage stabilizing pipe is located inside plastic casing.Secondary lead
Between bi-directional voltage stabilizing pipe in parallel, not only ensure that safety of the mutual inductor under open-circuit condition, but also do not influence its performance.
One of side wall between plastic lid and plastic casing is connected by pin shaft, is passed through between another opposite side wall
It snaps connection.
A kind of obtained high-precision open mutual inductor of the utility model can effectively realize that bimag magnetic shunt path potential is mended
It repays, effectively control error, makes control errors within 0.5%, phase difference Linear Control is within 2 points.
Detailed description of the invention
Fig. 1 is the first winding schematic diagram of the utility model；
Fig. 2 is the principles of the present invention schematic diagram 1；
Fig. 3 is the principles of the present invention schematic diagram 2；
Fig. 4 is the current direction schematic diagram of the utility model；
Fig. 5 is the opening state main view of the utility model；
Fig. 6 is the opening state side view of the utility model；
Fig. 7 is the closed state schematic diagram of the utility model.
Specific embodiment
Below by embodiment combination attached drawing, the utility model will be further described.
Embodiment 1:
As shown in Fig. 5, Fig. 6, Fig. 7, a kind of high-precision open mutual inductor of the present embodiment description, including plastic casing 1, plastics
Lid 2,5, No. four magnetic cores 6 of the magnetic core of magnetic core 4, three of No.1 magnetic core 3, two, secondary coil 11 and primary lead, wherein No.1 magnetic core
3,4, No. three magnetic cores 5 of No. two magnetic cores and No. four magnetic cores 6 are semicircle ring structure, and No.1 magnetic core 3 and No. two magnetic cores 4 are disposed side by side on
Inside plastic casing 1, No. three magnetic cores 5 and No. four magnetic cores 6 are disposed side by side on inside plastic lid 2, are cooperated in plastic casing 1 and plastic lid 2
When, No.1 magnetic core 3 and No. three magnetic cores 5 cooperatively form the magnetic core of a cirque structure, and No. two magnetic cores 4 and No. four magnetic cores 6 cooperate
Also formed a cirque structure magnetic core, second of form of secondary coil 11 are as follows: including be separately positioned on No.1 magnetic core 3,
Two on No. two magnetic cores 4 wind, and two windings on No.1 magnetic core 3 are arranged in parallel, and two windings on No. two magnetic cores 4 are in parallel
Setting, as a wherein secondary lead 13 after the heads connection of two windings on No.1 magnetic core 3, two on No.1 magnetic core 3
Head of the tail portion of winding respectively with two windings on No. two magnetic cores 4 is correspondingly connected with, the tail of two windings on No. two magnetic cores 4
Another secondary lead 13 is used as after portion's connection.
Magnetic core fixed frame 7 and winding for fixing No.1 magnetic core 3 and No. two magnetic cores 4 is provided in plastic casing 1 to fix
Lid 8, the No.1 magnetic core 3 and No. two settings of magnetic core 4 in magnetic core fixed frame 7 and are wound between fixed lid 8, in plastic lid 2
It is internally provided with elastic slice 10 and the fixed lid 9 of magnetic core, No. three magnetic cores 5 and No. four settings of magnetic core 6 are solid in elastic slice 10 and magnetic core
Determine between lid 9, when plastic casing 1 and plastic lid 2 cooperate, No. three magnetic cores 5 and No. four magnetic cores 6 are pressed to No.1 magnetic core 3 by elastic slice 10
With No. two magnetic cores 4.When secondary coil 11 is second of form, winding is wound around respectively outside 3, No. two magnetic cores 4 of No.1 magnetic core
On the magnetic core fixed frame 7 in portion, 3, No. two magnetic cores 4 of No.1 magnetic core are threaded through respectively inside magnetic core fixed frame 7.
Bi-directional voltage stabilizing pipe 12 is provided between two secondary leads 13, bi-directional voltage stabilizing pipe 12 is located inside plastic casing 1.Modeling
Expect that one of side wall between lid 2 and plastic casing 1 is connected by pin shaft, is connected between another opposite side wall by buckle
It connects.
Compensation principle:
Had as follows by magnetic potential balance equation by such as Fig. 4 current direction:
1# magnetic core: I1N1-I22N2-I21N2=I1N1-I2N2=I01N1 ①
2# magnetic core: I1N1-I22N3-I21N4=I02N1 ②
In formula, I01For the exciting current of 1# magnetic core, I02For the exciting current of 2# magnetic core, equal very little is approximately 0.
1., 2.
I2N2≈I22N3+I21N4 ③
Two, by KVL law, have as follows:
Circuit 1:E2+E3=I22(r2+r3)+I2rb ④
Circuit 2:E2+E4=I21(r2+r4)+I2rb ⑤
In formula, E2、E2' it is the exciting current of 1# magnetic core in N2The induced electromotive force of middle generation,
E3For 2# magnetic core exciting current in N3The induced electromotive force of middle generation,
E4For 2# magnetic core exciting current in N4The induced electromotive force of middle generation.
Work as N2When reaching zero output error (1# magnetic core reaches Zero flux state), have
E2=E2’≈0 ⑥
N on 2# magnetic core3、N4A transformer is constituted, is met
Will 6., 7. bring into 4., 5., obtain
By I22=I2-I21It substitutes into 3., obtains
I2N2≈(I2-I21)N3+I21N4, both ends are divided by I2
By I22=I2-I21It substitutes into 8., both ends are divided by I2, obtain
For the convenient of production and reaching the optimum efficiency of compensation, 1# magnetic core takes Double-wire parallel wound, reaches N2=N2 ',
Also, we set N2=N3, in this way, there is following relationship
Technical requirements:
1, this product meets 0.1 grade of JB/T10665-2016 micro-transformer of current requirement；
2, transformer core selects the 1K107 nanometer crystal alloy after special thermal treatment technique, and magnetic core surface passes through coating
Technique increases by one layer of insulating protective layer；
3, magnetic core is cut using special magnetic core cutting machine；
4, when once inputting 2%Ib~Imax, ratio difference≤± 0.5%, phase difference < ± 4'；
When primary input 2%Ib~Imax, phase difference variable quantity < ± 2'.
Claims (5)
1. a kind of high-precision open mutual inductor, it is characterized in that: including plastic casing, plastic lid, No.1 magnetic core, No. two magnetic cores, No. three
Magnetic core, No. four magnetic cores, secondary coil and primary lead, wherein No.1 magnetic core, No. two magnetic cores, No. three magnetic cores and No. four magnetic cores are
Semicircle ring structure, No.1 magnetic core and No. two magnetic cores are disposed side by side on inside plastic casing, and No. three magnetic cores and No. four magnetic cores are arranged side by side
Inside plastic lid, when plastic casing and plastic lid cooperate, No.1 magnetic core and No. three magnetic cores cooperatively form a cirque structure
Magnetic core, No. two magnetic cores and the cooperation of No. four magnetic cores also form the magnetic core of a cirque structure, and the form of the secondary coil is
Two kinds, wherein the first form are as follows: including four be arranged on No.1 magnetic core, No. two magnetic cores, No. three magnetic cores and No. four magnetic cores
It winds, the head of the winding on No.1 magnetic core is drawn after connecting with the head of the winding on No. three magnetic cores as a wherein secondary
The tail portion of line, the winding on No.1 magnetic core is connect with the head of the winding on No. two magnetic cores, the tail portion of the winding on No. three magnetic cores
It is connect with the head of the winding on No. four magnetic cores, the tail portion of the winding on No. two magnetic cores and the tail portion of the winding on No. four magnetic cores connect
Another secondary lead is used as after connecing；Second of form of secondary coil are as follows: including being separately positioned on No.1 magnetic core, No. two magnetic cores
On two windings, two windings on No.1 magnetic core are arranged in parallel, and two windings on No. two magnetic cores are arranged in parallel, No.1 magnetic
As a wherein secondary lead after the head connection of two windings on core, the tail portions of two windings on No.1 magnetic core respectively with
The head of two windings on No. two magnetic cores is correspondingly connected with, and is used as another after the tail portion connection of two windings on No. two magnetic cores
Secondary lead.
2. a kind of high-precision open mutual inductor according to claim 1, it is characterized in that: being provided in plastic casing for solid
Determine the magnetic core fixed frame and the fixed lid of winding of No.1 magnetic core and No. two magnetic cores, the No.1 magnetic core and No. two magnetic cores are arranged in magnetic
Between core fixed frame and the fixed lid of winding, elastic slice and the fixed lid of magnetic core, No. three magnetic cores are internally provided in plastic lid
And the setting of No. four magnetic cores is between elastic slice and the fixed lid of magnetic core, when plastic casing and plastic lid cooperate, elastic slice by No. three magnetic cores and
No. four magnetic cores press to No.1 magnetic core and No. two magnetic cores.
3. a kind of high-precision open mutual inductor according to claim 2, it is characterized in that: when secondary coil is second of form
When, winding is wound around No.1 magnetic core, on the magnetic core fixed frame outside No. two magnetic cores respectively, No.1 magnetic core, No. two magnetic cores difference
It is threaded through inside magnetic core fixed frame.
4. a kind of high-precision open mutual inductor according to claim 1 or 2, it is characterized in that: between two secondary leads
It is provided with bi-directional voltage stabilizing pipe, bi-directional voltage stabilizing pipe is located inside plastic casing.
5. a kind of high-precision open mutual inductor according to claim 3, it is characterized in that: its between plastic lid and plastic casing
In a side wall connected by pin shaft, be connected by a snap between another opposite side wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920504881.9U CN209418293U (en) | 2019-04-15 | 2019-04-15 | A kind of high-precision open mutual inductor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920504881.9U CN209418293U (en) | 2019-04-15 | 2019-04-15 | A kind of high-precision open mutual inductor |
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| CN209418293U true CN209418293U (en) | 2019-09-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866477A (en) * | 2021-08-30 | 2021-12-31 | 中国人民解放军海军工程大学 | Four-magnetic-core six-coil magnetic modulation high-precision ultra-large aperture current detection method and system |
| CN114284047A (en) * | 2022-03-04 | 2022-04-05 | 山西省机电设计研究院有限公司 | Open-close bus type high-precision zero-flux current transformer and error compensation method |
| CZ309328B6 (en) * | 2021-06-04 | 2022-08-24 | Univerzita Hradec Králové | Current shunt |
-
2019
- 2019-04-15 CN CN201920504881.9U patent/CN209418293U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ309328B6 (en) * | 2021-06-04 | 2022-08-24 | Univerzita Hradec Králové | Current shunt |
| CN113866477A (en) * | 2021-08-30 | 2021-12-31 | 中国人民解放军海军工程大学 | Four-magnetic-core six-coil magnetic modulation high-precision ultra-large aperture current detection method and system |
| CN113866477B (en) * | 2021-08-30 | 2022-07-05 | 中国人民解放军海军工程大学 | Four-magnetic-core six-coil magnetic modulation high-precision ultra-large aperture current detection method and system |
| CN114284047A (en) * | 2022-03-04 | 2022-04-05 | 山西省机电设计研究院有限公司 | Open-close bus type high-precision zero-flux current transformer and error compensation method |
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