CN207009278U - current collecting device - Google Patents
current collecting device Download PDFInfo
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- CN207009278U CN207009278U CN201720675674.0U CN201720675674U CN207009278U CN 207009278 U CN207009278 U CN 207009278U CN 201720675674 U CN201720675674 U CN 201720675674U CN 207009278 U CN207009278 U CN 207009278U
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- collecting device
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Abstract
Embodiment of the present utility model provides a kind of current collecting device.The current collecting device includes current transformer and current collection circuit, and current transformer includes iron core, secondary winding is wound with iron core；The output end of secondary winding is connected with current collection circuit, and the nominal load of secondary winding is 1 to 2 times of total sampler body load of current collection circuit；Wherein, total sampler body load of current collection circuit includes the sampling load of current collection circuit, and the connection impedance between the output end of secondary winding and current collection circuit.Using the technical solution of the utility model, the degree of accuracy of current transformer measurement electric current can be improved, and improves the ratio between saturation current and rated current of current transformer, so that current transformer realizes measurement and defencive function simultaneously.
Description
Technical field
Electric and electronic technical field is the utility model is related to, more particularly to a kind of current collecting device.
Background technology
At present, the current transformer commonly used in a power distribution system is divided into Verification of Measuring Current Transformer and protection Current Mutual Inductance
Device.Wherein, Verification of Measuring Current Transformer can ensure there is the higher degree of accuracy at 1.2 times of rated current and when following, but
Have larger current by when, the iron core of Verification of Measuring Current Transformer can quickly reach magnetic saturation, it is impossible to ensure the standard of current measurement
Exactness, it is impossible to meet requirement of the protective relaying device to the electric current degree of accuracy.Protective current transformer, can for larger current
Ensure the degree of accuracy of current measurement, meet the requirement of protective relaying device, but when electric current is less than 1.2 times of rated current, just
It cannot be guaranteed that the degree of accuracy of current measurement.
Therefore, there is measurement and defencive function during existing current transformer difference.In order to meet the needs of distribution system,
Need that Verification of Measuring Current Transformer and protective current transformer, are installed simultaneously, cost is higher and cannot be guaranteed the standard of current measurement
Exactness.
Utility model content
Embodiment of the present utility model provides a kind of current collecting device, so that current transformer is realized measurement and protected simultaneously
Protective function.
To reach above-mentioned purpose, embodiment of the present utility model provides a kind of current transformer, including：Current transformer
And current collection circuit, the current transformer include iron core, secondary winding are wound with the iron core；The secondary winding
Output end is connected with the current collection circuit, and the nominal load of the secondary winding is adopted for the totality of the current collection circuit
1 to 2 times of sample load；Wherein, total sampler body load of the current collection circuit includes the sampling of the current collection circuit
Load, and the connection impedance between the output end of the secondary winding and the current collection circuit.
Alternatively, the scope of the few ratio of the specified number of turn of the turn ratio of the secondary winding is 0%-5%；It is and/or described
Short-circuit circle is wound with iron core.
Alternatively, the iron core includes high magnetic conducting band shape silicon steel sheet.
Alternatively, the scope of the thickness of the high magnetic conducting band shape silicon steel sheet is 0.01mm-10mm.
Alternatively, the output capacity of the secondary winding is preset value.
Alternatively, the rated value of the output current of the secondary winding is 0.1A or 1A.
Alternatively, the connection impedance includes connecting between the output end of the secondary winding and the current collection circuit
Between the line impedance of circuit, and the output end and the current collection circuit of the connection line and the secondary winding
Connect impedance.
Alternatively, the current collecting device also includes the amplifying circuit being connected with the current collection circuit.
Alternatively, the current collecting device also includes port protection module and/or the AD being connected with the amplifying circuit
Sampling module.
The current collecting device of the utility model embodiment, pass through the nominal load of the secondary winding of control electric current transformer
For 1 to 2 times of total sampler body load of current acquisition electric current, it is more than current acquisition electricity in the nominal load for meeting current transformer
In the case of the middle sampler body load on road, the nominal load of current transformer is effectively reduced, and causes the volume of current transformer
Fixed load matches with current collection circuit, improves the degree of accuracy of current transformer measurement electric current, and to improve electric current mutual
The ratio between the saturation current of sensor and rated current, so that current transformer realizes measurement and defencive function simultaneously.
Brief description of the drawings
Fig. 1 is the structural representation of the current collecting device of embodiment of the present utility model；
Fig. 2 is the structural representation of the current transformer of the current collecting device of the utility model embodiment.
Description of reference numerals：
10th, iron core；11st, secondary winding；12nd, the output end of secondary winding；13rd, shell；14th, fixed mechanism；20th, electric current is adopted
Collector；21st, amplifying circuit；22nd, port protection module；23rd, AD sampling modules；30、MCU.
Embodiment
(identical label represents identical element in some accompanying drawings) is to the utility model embodiment below in conjunction with the accompanying drawings
Current collecting device is described in detail.
Fig. 1 is the structural representation of the current collecting device of embodiment of the present utility model.
As shown in figure 1, the current collecting device of the present embodiment includes current transformer and current collection circuit, Current Mutual Inductance
Device includes iron core 10, and secondary winding 11 is wound with iron core 10；The output end 12 of secondary winding is connected with current collection circuit 20,
The nominal load of secondary winding 11 is 1 to 2 times that total sampler body of current collection circuit 20 loads.Wherein, current collection circuit
20 total sampler body load includes the sampling load of current collection circuit 20, and the output end 12 and current acquisition of secondary winding
Connection impedance between circuit 20, that is, sampling of the total sampler body load of current collection circuit 20 for current collection circuit 20
Load, the connection impedance sum between the output end 12 of secondary winding and current collection circuit 20.
In the utility model embodiment, the nominal load of secondary winding 11 loads for total sampler body of current collection circuit 20
1~2 times, relative to secondary winding 11 in the prior art nominal load be total sampler body load 3~10 times, equivalent to
In the case of meeting that nominal load is more than the load of total sampler body, the nominal load of secondary winding 11 is significantly reduced.
In the current collecting device, current collection circuit 20 is connected with secondary winding 11, for gathering current signal.It is logical
Crossing reduces the nominal load of secondary winding 11, is used for the part for providing exciting current in primary side current to reduce, so as to increase
Add the stability for the current signal that current collection circuit 20 gathered, and then improve the accurate of current transformer measurement electric current
Degree.And so that the nominal load of secondary winding 11 matches with current collection circuit 20, in current transformer because volume is limited
And when limiting output capacity, higher saturation multiple can also be obtained.For example, when once by 15 times of rated current, output
Just it can reach saturation.That is, the present embodiment is by reducing the nominal load of current transformer, and by by nominal load with
Current collection circuit 20 matches, and the ratio between saturation current and rated current of current transformer can be improved, in measurement electric current
The defencive function of current transformer is realized on the basis of transformer, it is achieved thereby that measurement and the defencive function of current transformer
Unification.
As shown in Fig. 2 in the current transformer of the present embodiment, first winding is not wound on iron core 10 directly, and pass through
By circuit-under-test directly through iron core 10, first winding is replaced using the electric current of circuit-under-test magnetic induction formation.Certainly, at it
In his embodiment, first winding can also be directly wound on iron core 10.
Alternatively, the connection impedance between the output end 12 of secondary winding and current collection circuit 20, including secondary winding
Output end 12 and current collection circuit 20 between connection line line impedance, and connection line and secondary winding is defeated
The connection impedance gone out between end 12 and current collection circuit 20.For example, the output end 12 of secondary winding is adopted by wire and electric current
Collector 20 connects, then the connection impedance between the output end 12 of secondary winding and current collection circuit 20 includes wire internal resistance
Anti-, the existing connection impedance in output end junction of wire and secondary winding, and wire are deposited with current collection circuit junction
Connection impedance.
Alternatively, the output capacity of current transformer is preset value.For example, the volume of control electric current transformer is setting
Value, the output capacity for carrying out control electric current transformer is preset value.Illustrate herein, in other embodiments, can also be by electric current
The volume increase of transformer so that the output capacity of current transformer is higher, is electric current controlling the nominal load of secondary winding
In the case of more than 2 times of total sampler body load of Acquisition Circuit, to realize measurement and the defencive function of current transformer simultaneously.
In the present embodiment, current transformer improves measurement accuracy by carrying out accuracy compensation, further to improve electric current
The degree of accuracy of transformer measurement electric current.The current transformer of the present embodiment is not construed as limiting to the accuracy compensation mode of use.Specifically
Ground, secondary turn compensation mode and/or short circuited turn compensation mode can be used.
For example, when using secondary turn compensation mode, can be by controlling the specified number of turn of turn ratio of secondary winding 11
It is few, and the scope of the few ratio of the specified number of turn of turn ratio of secondary winding 11 is 0%-5%.That is, secondary winding 11 is than specified
The number of turn is few around several circles, for being compensated to the ratio difference of current transformer.For example, if secondary winding 11 is fewer than the specified number of turn around Nx
Circle, its compensation rate Δ f can pass through formula：Δ f=Nx/ (N2-Nx) × 100% is calculated.Wherein, N2 is secondary winding 11
The specified number of turn.
For another example when using short circuited turn compensation mode, short circuit can be wound between first winding and secondary winding 11
Circle.Using short circuited turn compensation mode, can make in once ampere-turn in addition to the field ampere-turns of iron core 10 consumed originally, to be also consumed by short circuit
Circle short circuit currents ampere-turn, that is, the error of current transformer is field ampere-turns and short circuit current ampere-turn sum, pass through short-circuit circle
It can be compensated with the error of current transformer.Wherein, short-circuit circle to the compensation numerical value of error for negative short circuit current ampere-turn with
The ratio of primary current ampere-turn.As shown in Fig. 2 in actual applications, if do not wound directly on the iron core 10 of current transformer
First winding, then second short circuit circle can be wound on iron core 10.
In a kind of optional embodiment, iron core 10 includes high magnetic conducting band shape silicon steel sheet.For example, use thickness range for
0.01mm-10mm high magnetic conducting band shape high-quality silicon steel sheet.Using high magnetic conducting band shape high-quality silicon steel sheet, iron core 10 can be enabled
Higher magnetic flux is obtained, and then improves the magnetic saturation of iron core 10.That is, the magnetic saturation by improving iron core 10, to carry
High first winding allows the maximum by electric current, so as in the case where first winding is by larger current, cause
Iron core 10 reaches magnetic saturation.
In addition, the current transformer of the present embodiment includes shell, in the given volume of current transformer, namely shell size
, can be by rationally controlling the area in the section of iron core 10 and the window of iron core 10 in the case of fixation.For example, space inside the housing
In the case of allowing, the area in increase iron core 10 section is adapted to.
In the present embodiment, the rated value of the output current of secondary winding 11 is 0.1A or 1A.
As shown in Fig. 2 amplifying circuit 21, amplifying circuit 21 and current acquisition can also be included in the current sensing means
Circuit 20 is connected, and the current signal that the secondary winding 11 for current collection circuit 20 to be gathered gathers output is amplified, from
And conveniently the current signal after amplification is handled.
In addition, current sensing means can also include port protection module 22 and/or AD sampling modules 23.
For example, it is connected to amplifying circuit 21, port protection module 22 and AD sampling modules 23 in turn current collection circuit
Between MCU 30.The current signal that current collection circuit gathers from secondary winding, successively by amplifying circuit 21, port protection
Module 22 and AD sampling modules 23, are transferred to and MCU, and current signal is analyzed and processed by MCU 30.Wherein, MCU 30 can
To set in digital distribution terminal in a power distribution system, for gathering the electric current in distribution line by current collecting device
Signal, realize the measurement to electric current in distribution line, and the further protection of realization to distribution line etc..
The above-mentioned current collecting device for the utility model embodiment, the current collecting device are suitably mounted to power distribution system
In system.The current collecting device has the following technical effect that：
The current collecting device of the utility model embodiment, pass through the nominal load of the secondary winding of control electric current transformer
For 1 to 2 times of total sampler body load of current acquisition electric current, it is more than current acquisition electricity in the nominal load for meeting current transformer
In the case of the middle sampler body load on road, the nominal load of current transformer is effectively reduced, and causes the volume of current transformer
Fixed load matches with current collection circuit, improves the degree of accuracy of current transformer measurement electric current, and to improve electric current mutual
The ratio between the saturation current of sensor and rated current, so that current transformer realizes measurement and defencive function simultaneously.
Further, precision is carried out to current transformer by secondary turn compensation mode and/or short circuited turn compensation mode
Compensation, the measurement accuracy and the linearity that can make current transformer reach 5/1000ths, further increase current transformer survey
The degree of accuracy of electric current is measured, Verification of Measuring Current Transformer and the accuracy requirement of protective current transformer, can be met simultaneously.
Further, iron core, and rationally control core section and iron are formed by using high magnetic conducting band shape silicon steel sheet
Core window area, the saturation degree of iron core is improved in material and structure, further increase current transformer measurement electric current
The degree of accuracy.
It may be noted that according to the needs of implementation, all parts described in this application can be split as more multi-part, also may be used
The part operation of two or more parts or part is combined into new part, to realize the purpose of this utility model.
It is described above, only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model discloses
Or replace, it should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should be with the power
The protection domain that profit requires is defined.
Claims (9)
- A kind of 1. current collecting device, it is characterised in that including current transformer and current collection circuit, the current transformer Including iron core (10), secondary winding (11) is wound with the iron core (10)；The output end (12) of the secondary winding is connected with the current collection circuit (20), the secondary winding (11) it is specified Load 1 to 2 times of total sampler body load for the current collection circuit (20)；Wherein, the current collection circuit (20) Total sampler body load includes the sampling load of the current collection circuit (20), and the output end (12) of the secondary winding and Connection impedance between the current collection circuit (20).
- 2. current collecting device according to claim 1, it is characterised in that the turn ratio of the secondary winding (11) is specified The scope of the few ratio of the number of turn is 0%-5%；And/or it is wound with short-circuit circle on the iron core (10).
- 3. current collecting device according to claim 1, it is characterised in that the iron core (10) includes high magnetic conducting band shape silicon Steel disc.
- 4. current collecting device according to claim 3, it is characterised in that the thickness of the high magnetic conducting band shape silicon steel sheet Scope is 0.01mm-10mm.
- 5. current collecting device according to claim 1, it is characterised in that the output capacity of the secondary winding (11) is Preset value.
- 6. current collecting device according to claim 1, it is characterised in that the output current of the secondary winding (11) Rated value is 0.1A or 1A.
- 7. current collecting device according to claim 1, it is characterised in that the connection impedance includes the secondary winding Output end (12) and the current collection circuit (20) between connection line line impedance, and the connection line and institute State the connection impedance between the output end (12) of secondary winding and the current collection circuit (20).
- 8. current collecting device according to any one of claim 1 to 7, it is characterised in that the current collecting device Also include the amplifying circuit (21) being connected with the current collection circuit.
- 9. current collecting device according to claim 8, it is characterised in that the current collecting device also include with it is described The port protection module (22) and/or AD sampling modules (23) of amplifying circuit (21) connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720675674.0U CN207009278U (en) | 2017-06-12 | 2017-06-12 | current collecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720675674.0U CN207009278U (en) | 2017-06-12 | 2017-06-12 | current collecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207009278U true CN207009278U (en) | 2018-02-13 |
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ID=61446564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720675674.0U Active CN207009278U (en) | 2017-06-12 | 2017-06-12 | current collecting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN207009278U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109036812A (en) * | 2017-06-12 | 2018-12-18 | 天津市中力神盾电子科技有限公司 | current collecting device |
-
2017
- 2017-06-12 CN CN201720675674.0U patent/CN207009278U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109036812A (en) * | 2017-06-12 | 2018-12-18 | 天津市中力神盾电子科技有限公司 | current collecting device |
| CN109036812B (en) * | 2017-06-12 | 2024-04-12 | 天津市中力神盾电子科技有限公司 | Current acquisition device |
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