CN206516474U - Current transformer - Google Patents
Current transformer Download PDFInfo
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- CN206516474U CN206516474U CN201720074869.XU CN201720074869U CN206516474U CN 206516474 U CN206516474 U CN 206516474U CN 201720074869 U CN201720074869 U CN 201720074869U CN 206516474 U CN206516474 U CN 206516474U
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Abstract
The utility model provides a kind of current transformer, including primary winding winding (10) and at least one secondary coil winding (20), and primary winding winding (10) passes through secondary coil winding (20)；Each described secondary coil winding (20) includes at least two iron cores, the respectively iron core of secondary coil winding first (21) and the iron core of secondary coil winding second (23)；The iron-core coil of secondary coil winding first (22) is wound with the iron core of secondary coil winding first (21)；The iron-core coil of secondary coil winding second (24) is wound with the iron core of secondary coil winding second (23)；It is connected in parallel between the described iron-core coil of secondary coil winding first (22) and the iron-core coil of secondary coil winding second (24).Coil turn on each iron core of secondary coil winding is identical.
Description
Technical field
The utility model is related to technical field of electricity, and in particular to the secondary coil of current transformer is around grouping error and output
The related technical field of capacity, the secondary coil winding technique of particularly low number of ampere turns current transformer.
Background technology
In power system, current transformer is the equipment for connecting primary system and electrical secondary system, is the meter of power system
Amount and relay protection provide the information of accurate and standard.If the error of current transformer does not reach requirement, it will influence meter
Reliable, the harm safe operation of power system of the accurate and relay protection of amount.
Usual current transformer includes primary winding winding and one or more secondary coil winding.Each secondary line
Enclose winding and coiling is carried out using single iron core, simple marginal data is carried out with existing product below.
Figure 1A -1B are the structural representations of existing current transformer；Wherein, the current transformer shown in Figure 1A includes one
Individual secondary coil winding, primary winding winding 10 is passed through from secondary coil winding 12, and secondary coil winding 12 includes an iron core
121 and surround the secondary coil winding conducting wire 122 on iron core 121.Current transformer shown in Figure 1B includes two secondary lines
Enclose winding, respectively first secondary coil winding 13 and second secondary coil winding 14.Primary winding winding 10 from first
Individual secondary coil winding 13 and second secondary coil winding 14 are passed through；First secondary coil winding 13 includes an iron core
131 and surround the secondary coil winding conducting wire 132 on iron core 131；Second secondary coil winding 14 includes an iron core 141
With the secondary coil winding conducting wire 142 surrounded on iron core 1241.
By taking the current transformer shown in Figure 1A as an example, number of turn N2 and primary winding that secondary coil winding conducting wire 122 is wrapped
Relation formula is met between number of turn N1, rated primary current I1n and rated secondary current I2n that winding 10 is wrapped：I1n*N1=
I2n*N2, its physical unit is：The ampere * numbers of turn, referred to as：Number of ampere turns.
Existing current transformer shown in Figure 1A -1B, no matter including several secondary coil windings, it is per single secondary coil
Winding carries out coiling using single iron core.
For the relatively low current transformer of number of ampere turns, because secondary coil winding number of ampere turns is less, exists and following mainly ask
Topic：
1) error requirements of high-precision class of accuracy can not be met；
2) the output requirement of Large Copacity can not be met, it is impossible to meet the demand of secondary circuit relay protection devices.
In order to meet above-mentioned two requirements as far as possible, it is necessary to increase core section product, so as to add the size of iron core, cause
The appearance and size increase of the even whole current transformer of secondary coil winding, it is impossible to be installed in switch cubicle.
Utility model content
The problem of being primarily present for above-mentioned existing current transformer, the utility model provides a kind of current transformer, its
Including primary winding winding and at least one secondary coil winding, primary winding winding passes through secondary coil winding；It is each secondary
Coil windings include at least two iron cores, the respectively iron core of secondary coil winding first and the iron core of secondary coil winding second；Two
The iron-core coil of secondary coil winding first is wound with the iron core of secondary coil winding first；Two are wound with the iron core of secondary coil winding second
The iron-core coil of secondary coil winding second；The described iron-core coil of secondary coil winding first and the iron core line of secondary coil winding second
It is connected in parallel between circle.
According to a most preferred embodiment of the present utility model, rated current is less than 200 ampere-hours, described primary winding around
Group is single-turn circular coil.
According to a most preferred embodiment of the present utility model, the coil turn on each iron core of described secondary coil winding
Number is identical.
Current transformer structure of the present utility model is compact, and small volume is lightweight, can meet in reduced size switch cubicle
The requirement of middle installation；Dependable performance, cost is low.
Brief description of the drawings
Figure 1A -1B are the structural representations of existing current transformer；Wherein, the current transformer shown in Figure 1A includes one
Individual secondary coil winding, the current transformer shown in Figure 1B includes two secondary coil windings；
Fig. 2 and Fig. 3 are current transformer general structure schematic diagrams of the present utility model；Wherein, the Current Mutual Inductance shown in Fig. 2
Device includes a secondary coil winding；
Current transformer shown in Fig. 3 includes three secondary coil windings.
Embodiment
With reference to each accompanying drawing, the structure and function of the utility model current transformer is described in detail.
The problem of being primarily present for existing current transformer in above-mentioned background technology, the utility model provides a kind of electricity
Current transformer, Fig. 2 and 3 is current transformer general structure schematic diagram of the present utility model；Wherein, the Current Mutual Inductance shown in Fig. 2
Device includes a secondary coil winding, in the current transformer shown in Fig. 3, including three secondary coil windings.Such as Fig. 2 and figure
Shown in 3, current transformer of the present utility model includes primary winding winding 10 and at least one secondary coil winding 20, each
Described secondary coil winding 20 include at least two iron cores, respectively the first iron core of secondary coil winding 21 and secondary coil around
The second iron core 23 of group.Primary winding winding 10 passes through secondary coil winding 20.
In current transformer shown in Fig. 3, illustrate that this practicality is new to further contrast existing explanation current transformer
The feature and advantage of the current transformer of type, are easy to exemplary illustration, in these three secondary coil windings, one of secondary line
Enclosing winding includes an iron core；One of secondary coil winding 20 includes two iron cores；Also one secondary coil winding 30
Including three iron cores.In practical application, secondary coil winding can have 1 or multiple according to the parameter and demand of transformer
Secondary coil winding, and each winding can have at least two iron core, coiling wire on each core, and by these iron
On core after the conductor in parallel of coiling, a secondary coil winding is formed.
As shown in figure 3, include the secondary coil winding 30 of three iron cores, the first iron core of secondary coil winding 31, secondary line
Enclose the second iron core of winding 32 and the iron core 33 of secondary coil winding the 3rd.
As shown in Figures 2 and 3, it is wound with the iron-core coil of secondary coil winding first on the first iron core of secondary coil winding 21
22；The second iron-core coil of secondary coil winding 24 is wound with the second iron core of secondary coil winding 23；Described secondary coil winding
It is connected in parallel between first iron-core coil 22 and the second iron-core coil of secondary coil winding 24 in lead-out terminal side.As shown in figure 3,
Include the secondary coil winding 30 of three iron cores, three coil windings thereon are also to be connected in parallel in lead-out terminal side.
According to a most preferred embodiment of the present utility model, described primary winding winding 10 is single-turn circular coil.Existing
In current transformer, primary winding winding is that single-turn circular coil is only occurred in the current transformer of high current, especially specified electricity
Stream is more than 400 ampere-hours.In the present embodiment, for low current, such as less than 200 amperes of current transformer, primary winding
Winding uses single-turn circular coil.
According to a most preferred embodiment of the present utility model, described the first iron-core coil of secondary coil winding 22 and secondary line
Enclose winding 24 numbers of turn of the second iron-core coil identical.The number of turn is identical, is conducive to the calculating of the number of turn, due to the iron of secondary coil winding first
Core coil 22 and the number of turn of the second iron-core coil of secondary coil winding 24 are in parallel, contrast the secondary coil of existing single iron core around
Under group, equivalent parameters, the first iron-core coil of secondary coil winding 22 and the number of turn of the second iron-core coil of secondary coil winding 24 are
Twice.Equally, in the current transformer shown in Fig. 3, the secondary coil winding 30 of three iron cores is included, for three iron
Core can also coiling wire the number of turn it is identical, the coiling number of turn of each iron core is three times.
According to secondary coil winding quantity in parallel, improve the number of turn of secondary coil winding, thus improve secondary coil around
The number of ampere turns of group, to meet the requirement of error and secondary coil winding output capacity.
Further, due to improving the number of turn of secondary coil winding, each secondary coil can reduce much around packet size, and
After connection, total secondary coil can be smaller than existing current transformer around packet size, has saved dimensional space.
Current transformer of the present utility model, because the size of new departure is smaller, material is using less, so as to also reduce
Material Cost.
Current transformer of the present utility model, is not limited to the current transformer of some model, but goes for institute
Some current transformers.With reference to the advantage of the embodiment comparative illustration current transformer of the present utility model of design parameter.
Such as, current mutual-inductor parameter：Rated current ratio：50/1A, class of accuracy：0.5, rated output：5VA；
Existing current transformer, using a secondary coil winding, the secondary coil winding is single iron core, iron core chi
Very little is the φ 140 × 110 (inner/outer diameter × height, mm) of φ 100/, and umber of turn is 50 circles, and secondary number of ampere turns is 50 ampere-turns；
Using current transformer of the present utility model, using a secondary coil winding, the secondary coil winding uses two
Individual identical iron core winding, each core dimensions is the φ 140 × 30 (inner/outer diameter × height, mm) of φ 100/, and wire is defeated
Go out end in parallel.The coiling number of turn of each iron core is 100 circles, and secondary coil winding number of ampere turns brings up to 100 ampere-turns.
Found out by above-mentioned example contrast, according to current transformer of the present utility model, using identical inside/outside diameter size
In iron core, such as above-mentioned example, original iron core height 110mm, the iron core of current transformer of the present utility model, single is iron core
30mm, the height of two iron cores is 60mm, adds the winding space height about 20mm of two iron cores.Electric current of the present utility model
The iron core height of transformer is reduced to about 80mm by 120mm (additional 10mm winding heights) originally about, is reduced beyond 30%.
According to error measured result, error achievement also has 20% nargin, and the error achievement of existing current transformer already close to
The limit, without nargin.
The relatively existing current transformer of current transformer of the present utility model, with least advantages below：
1) low number of ampere turns current transformer can be made to meet the requirement of high accuracy and Large Copacity output；
2) current transformer structure of the present utility model is compact, and small volume is lightweight, can meet in reduced size switch
The requirement installed in cabinet；
3) dependable performance, cost is low.
In summary, current transformer of the present utility model, can solve the high accuracy of low number of ampere turns current transformer by mistake
The output problem of difference and Large Copacity, it is possible to reduce transformer size, the switch cubicle for making it be applied to small size.
Although disclosing preferred embodiment of the present utility model and accompanying drawing for the purpose of illustration, skilled
Personnel, do not depart from the utility model and appended spirit and scope by the claims in, can make it is various replace, change and moisten
Decorations.Therefore, the utility model should not be limited to preferred embodiment and accompanying drawing disclosure of that, protection domain of the present utility model
It is defined by the scope of which is defined in the appended claims.
Claims (3)
1. a kind of current transformer, including primary winding winding (10) and at least one secondary coil winding (20), primary winding
Winding (10) passes through secondary coil winding (20), it is characterised in that：Each described secondary coil winding (20) includes at least two
Individual iron core, the respectively iron core of secondary coil winding first (21) and the iron core of secondary coil winding second (23)；
The iron-core coil of secondary coil winding first (22) is wound with the iron core of secondary coil winding first (21)；Secondary coil winding
The iron-core coil of secondary coil winding second (24) is wound with two iron cores (23)；
It is in parallel between the described iron-core coil of secondary coil winding first (22) and the iron-core coil of secondary coil winding second (24)
Connection.
2. current transformer according to claim 1, it is characterised in that：Its rated current is less than 200 ampere-hours, described
Primary winding winding (10) is single-turn circular coil.
3. current transformer according to claim 1 or 2, it is characterised in that：It is each on described secondary coil winding
The coil turn of individual iron core is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720074869.XU CN206516474U (en) | 2017-01-19 | 2017-01-19 | Current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720074869.XU CN206516474U (en) | 2017-01-19 | 2017-01-19 | Current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206516474U true CN206516474U (en) | 2017-09-22 |
Family
ID=59866877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720074869.XU Active CN206516474U (en) | 2017-01-19 | 2017-01-19 | Current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206516474U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023028986A1 (en) * | 2021-09-03 | 2023-03-09 | Abb Schweiz Ag | Winding assembly and current transformer |
-
2017
- 2017-01-19 CN CN201720074869.XU patent/CN206516474U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023028986A1 (en) * | 2021-09-03 | 2023-03-09 | Abb Schweiz Ag | Winding assembly and current transformer |
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