CN209656769U - A kind of current transformer - Google Patents
A kind of current transformer Download PDFInfo
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- CN209656769U CN209656769U CN201920013156.1U CN201920013156U CN209656769U CN 209656769 U CN209656769 U CN 209656769U CN 201920013156 U CN201920013156 U CN 201920013156U CN 209656769 U CN209656769 U CN 209656769U
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- coil windings
- current transformer
- secondary detection
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Abstract
The utility model provides a kind of current transformer, current transformer between the secondary detection coil windings and second compensation coil windings and amplifier and load resistance of detection for only needing 3 connecting lines to be attached, compared to 4 line connections of tradition, the cost for reducing current transformer is achieved the purpose that.
Description
Technical field
The utility model belongs to current measurement techniques field, and in particular to a kind of current transformer.
Background technique
Current transformer be widely used in industrial field device and electric system once protect and control loop in, for surveying
Measure route in electric current, the basic performance requirement of current transformer first is that have low measurement error, but carry out electric energy
Current transformer is required to have alap measurement error when meter amount.
Referring to Fig. 1, conventional current transformer is made of magnetic core 1, primary coil 2 and secondary coil 4, indicates the line of " * "
Enclose the Same Name of Ends that terminal is primary coil 2 or secondary coil 4.When flowing through electric current in primary coil 2, due to electromagnetic induction, In
Potential will be induced in secondary coil 4, load resistance 6 is connected on secondary coil 4, then generates two in secondary coil 4
Primary current, secondary current are proportional to the electric current flowed through in primary coil 2.Due to the presence of core reluctance, current transformer is turning
During time-dependent current, it is necessary to consume sub-fraction electric current for excitation, magnetize magnetic core, to generate induction in secondary coil
Potential and secondary current, for the measurement error of current transformer precisely due to caused by exciting current consumed by magnetic core, electric current is mutual
The measurement error of sensor are as follows:
E1=[(R0+RL)/Zm]/[1+ (R0+RL)/Zm]
Wherein:
Zm: the excitation impedance of magnetic core 1；
R0: the impedance value of secondary coil 4；
RL: 6 Zu Pit value of load resistance；
For the measurement error for reducing current transformer, electric current can be effectively reduced using active compensation formula current transformer
The measurement error of mutual inductor, compensation circuit form have single iron core type and double-iron core formula.Application No. is 201110334904.4
Chinese patent: " current sensor for automobile based on Zero flux compensation " discloses a kind of technical solution, such as Fig. 2 institute
Show, includes magnetic core T, secondary winding N2, detection winding ND, magnetic flux compensation device 210, measuring unit 220, magnetic flux compensation dress
It sets 210 and provides compensation electric current to secondary winding N2 according to the potential difference at the both ends detection winding ND, so that the both ends detection winding ND
Potential difference go to zero, to achieve the effect that Zero flux, reduce the measurement error of current transformer.But need by it is secondary around
Two output lines of group N2 and two output lines of detection winding ND are connected to magnetic flux compensation device 210 and measuring unit 220,
Under the conditions of some application environments, by magnetic core T, secondary winding N2, detection winding ND manufacture at a detection components, and by magnetic flux
Compensation device 210 and measuring unit 220 are combined into a processing component, but the current sensor of the program is in detection components and place
4 connecting lines: two output lines of secondary winding N2 and two output lines of detection winding ND are needed between reason component, are exported
Line is more to result in current transformer higher cost.
Summary of the invention
The utility model has provided a kind of current transformer, using secondary detection coil windings and second compensation coil around
Between group and amplifier and load resistance only need 3 connecting lines be attached, thus reached reduce current transformer at
This purpose.
The utility model uses the following two kinds technical solution:
Technical solution one
A kind of current transformer, comprising: magnetic core, primary coil winding, secondary detection coil windings, second compensation coil around
Group, amplifier；
The primary coil winding, the secondary detection coil windings, the second compensation coil windings are wound on described
On magnetic core；
The anode of the input terminal of the amplifier is connected with the Same Name of Ends of the secondary detection coil windings, the amplification
The negative terminal of the input terminal of device is connected with the non-same polarity of the secondary detection coil windings, the output end of the amplifier and institute
The non-same polarity for stating second compensation coil windings is connected；
The Same Name of Ends of the secondary detection coil windings is connected with the Same Name of Ends of the second compensation coil windings, or
Person, the non-same polarity of the secondary detection coil windings are connected with the non-same polarity of the second compensation coil windings；
The both ends of the primary coil winding are the input terminal of zero-flux current transformer；
The Same Name of Ends of the second compensation coil windings and the power ground of the amplifier are zero-flux current transformer
Output end.
Further, the Same Name of Ends in second compensation coil windings connects load resistance with the power ground of amplifier.
Further, the secondary detection coil windings and second compensation coil windings using Double-wire parallel wound or separate winding
Mode is wound on the magnetic core.
Using the current transformer of this programme, generated magnetizing flux is two when electric current to be measured is by primary coil winding
Secondary detection coil winding both ends generate induced potential and are input to amplifier, and the output electric current of amplifier is supplied to second compensation line
Winding is enclosed to iron core degaussing, making the magnetic core of current transformer is approximately " Zero flux " state, to reduce current transformer
Measurement error.
Technical solution two
A kind of current transformer, comprising: magnetic core, primary coil winding, secondary detection coil windings, second compensation coil around
Group；
The primary coil winding, the secondary detection coil windings, the second compensation coil windings are wound on described
On magnetic core；
The Same Name of Ends of the secondary detection coil windings is connected with the Same Name of Ends of the second compensation coil windings, described
The non-same polarity of the both ends of second compensation coil windings and the secondary detection coil windings is the defeated of zero-flux current transformer
Outlet；Alternatively, the non-same polarity of the secondary detection coil windings is connected with the non-same polarity of the second compensation coil windings
It connects, the Same Name of Ends of the both ends of the second compensation coil windings and the secondary detection coil windings is zero-flux current transformer
Output end；
The both ends of the primary coil winding are the input terminal of zero-flux current transformer.
Further, the secondary detection coil windings and second compensation coil windings are wound on magnetic by the way of Double-wire parallel wound
On core.
The current transformer of the utility model with application No. is 201110334904.4 patent: " for automobile based on
The technical solution of the current sensor of Zero flux compensation " compares, secondary detection coil windings and second compensation coil windings with
Amplifier and load resistance only need 3 connecting lines, have used 1 connecting line less, have reduced the purpose of the cost of current transformer,
Cost is lower.
Detailed description of the invention
Fig. 1 is the functional block diagram of conventional current mutual inductor.
Fig. 2 is the functional block diagram of the Chinese patent application No. is 201110334904.4.
Fig. 3 to Fig. 6 is the schematic diagram of the utility model embodiment 1.
Fig. 7 is the schematic diagram of the utility model embodiment 2.Fig. 8 is the schematic diagram of the utility model embodiment 3.
Specific embodiment
The utility model is further described below with reference to embodiment, so that the utility model is clearer and more clear.
In each figure, the end that coil indicates " * " is Same Name of Ends, and the other end is non-same polarity.
Embodiment 1:
As shown in figure 3, a kind of zero-flux current transformer, comprising: magnetic core 1, primary coil winding 2, secondary detection coil
Winding 3, second compensation coil windings 4, amplifier 5；
Primary coil winding 2, secondary detection coil windings 3, second compensation coil windings 4 are wound on magnetic core 1；
The non-same polarity of secondary detection coil windings 3 is connected with the non-same polarity of second compensation coil windings 4；
The anode of the input terminal of amplifier 5 is connected with the Same Name of Ends of secondary detection coil windings 3, the input of amplifier 5
The negative terminal at end is connected with the non-same polarity of secondary detection coil windings 3 and the output end of amplifier 5 is connected；
The both ends of primary coil winding 2 are the input terminal of zero-flux current transformer；
The Same Name of Ends of second compensation coil windings 4 and the power ground of amplifier 5 are the output end of zero-flux current transformer.
In use, the Same Name of Ends in second compensation coil windings 4 connects load resistance 6 with the power ground of amplifier 5, then
There is following equation:
Np*Ip-Ns*Is-Ns*Im=0
Im=E/Zm
K* (Nf/Ns) * E+E=Is*R0+Is*RL
Wherein:
Np: the number of turns of primary coil winding 2
Ns: the number of turns of second compensation coil windings 4
Nf: the number of turns of secondary detection coil windings 3
Is: the electric current in second compensation coil windings 4
Im: the exciting current of magnetic core 1
E: the induced potential in second compensation coil windings 4
Zm: the excitation impedance of magnetic core 1
R0: the impedance value of second compensation coil windings 4
RL: the impedance value of load resistance 6
K: the amplification factor of amplifier 5
Solve above equation, can approximation obtain:
e≈e1/[1+K*(Nf/Ns)]
Wherein:
E1=[(R0+RL)/Zm]/[1+ (R0+RL)/Zm]
The measurement error of the zero-flux current transformer of the utility model than conventional current mutual inductor measurement error e1 also
Low [1+K* (Nf/Ns)] times, reduces the measurement error of current transformer, secondary detection coil windings 3 and second compensation line
Only 3 connecting lines is needed to be attached between circle winding 4 and amplifier 5 and load resistance 6, to reduce electric current mutual to reach
The purpose of the cost of sensor.
Specific experiment data-selected scheme is as follows:
1, using the technical solution of conventional current mutual inductor, as shown in Figure 1:
The maximum current of current transformer is 10A, rated current 1A；
Magnetic core 1 uses microcrystalline iron core, specification are as follows: Φ 14X Φ 19X6.5；
The number of turns of primary coil winding 2 is 1 circle, line footpath: 2mm；
The number of turns of secondary coil winding 4 is 500 circles, line footpath: 0.12mm；
Current transformer error test data when the impedance value of load resistance 6 is 5 Europe is as follows:
| Electric current (A) | Than poor (%) | Angular difference (divides) |
| 10 | -0.1434 | 5.0699 |
| 8 | -0.1529 | 5.7693 |
| 5 | -0.1582 | 7.2343 |
| 2 | -0.1580 | 7.7139 |
| 1 | -0.1601 | 9.6365 |
| 0.5 | -0.1558 | 11.348 |
| 0.2 | -0.1405 | 13.557 |
| 0.1 | -0.0942 | 13.151 |
| 0.05 | -0.0534 | 19.118 |
2, using the technical solution of the present embodiment:
The maximum current of current transformer is 10A, rated current 1A；
Magnetic core 1 uses microcrystalline iron core, specification are as follows: Φ 14X Φ 19X6.5；
The number of turns of primary coil winding 2 is 1 circle, line footpath: 2mm；
The number of turns of secondary detection coil windings 3 is 500 circles, line footpath: 0.12mm；
The number of turns of second compensation coil windings 4 is 500 circles, line footpath: 0.12mm；
Primary coil winding 2, secondary detection coil windings 3, second compensation coil windings 4 are wound on magnetic core 1；Amplification
The anode of the input terminal of device 5 is connected with the Same Name of Ends of secondary detection coil windings 3, the negative terminal of the input terminal of amplifier 5 and two
The non-same polarity of secondary detection coil winding 3 is connected, the output end of amplifier 5 and the non-same polarity of second compensation coil windings 4
It is connected；The non-same polarity of secondary detection coil windings 3 is connected with the non-same polarity of second compensation coil windings 4；Load electricity
Resistance 6 is connected on the Same Name of Ends of second compensation coil windings 4 and the power ground of amplifier 5, and the impedance value of load resistance 6 is 5 Europe.
Current transformer error test data is as follows:
| Electric current (A) | Than poor (%) | Angular difference (divides) |
| 10 | 0.0013 | -0.0702 |
| 8 | 0.0007 | 0.0652 |
| 5 | -0.0003 | -0.1515 |
| 2 | 0.0011 | -0.0006 |
| 1 | 0.0003 | -0.0006 |
| 0.5 | 0.0022 | 0.3036 |
| 0.2 | 0.0041 | 1.0940 |
| 0.1 | 0.0125 | 2.0940 |
| 0.05 | 0.0221 | 1.2840 |
The measurement error of the zero-flux current transformer of the present embodiment is smaller than the measurement error of conventional current mutual inductor to be obtained
It is more.
In addition, each coil windings can also differently carry out coiling:
A kind of zero-flux current transformer, comprising: magnetic core 1, primary coil winding 2, secondary detection coil windings 3, secondary
Bucking coil winding 4, amplifier 5；
Primary coil winding 2, secondary detection coil windings 3, second compensation coil windings 4 are wound on magnetic core 1；
The anode of the input terminal of amplifier 5 is connected with the Same Name of Ends of secondary detection coil windings 3, the input of amplifier 5
The negative terminal at end is connected with the non-same polarity of secondary detection coil windings 3, the output end and second compensation coil windings of amplifier 5
4 non-same polarity is connected；
The Same Name of Ends of secondary detection coil windings 3 is connected with the Same Name of Ends of second compensation coil windings 4, such as Fig. 4 institute
Show；Alternatively, the Same Name of Ends of secondary detection coil windings 3 is connect with the non-same polarity of second compensation coil windings 4, alternatively, secondary
The non-same polarity of detection coil winding 3 is connected with the Same Name of Ends of second compensation coil windings 4, as shown in Figure 5 and Figure 6；
The both ends of primary coil winding 2 are the input terminal of zero-flux current transformer；
The Same Name of Ends of second compensation coil windings 4 and the power ground of amplifier 5 are the output end of zero-flux current transformer.
Above scheme all reduces the measurement error of current transformer, secondary detection coil windings 3 and second compensation coil
Only 3 connecting lines is needed to be attached between winding 4 and amplifier 5 and load resistance 6, so that having reached reduces Current Mutual Inductance
The purpose of the cost of device.
Embodiment 2:
As shown in fig. 7, a kind of current transformer, comprising: magnetic core 1, primary coil winding 2, secondary detection coil windings 3,
Second compensation coil windings 4；
Primary coil winding 2, secondary detection coil windings 3, second compensation coil windings 4 are wound on magnetic core 1；
The both ends of primary coil winding 2 are the input terminal of zero-flux current transformer；
The non-same polarity of secondary detection coil windings 3 is connected with the non-same polarity of second compensation coil windings 4, secondary benefit
The non-same polarity at the both ends and secondary detection coil windings 3 of repaying coil windings 4 is the output end of zero-flux current transformer, is such as schemed
Shown in 7.
In use, the mode of connection shown in Fig. 3 of reference implementation example 1 is attached, embodiment 2 can achieve and embodiment
The purpose of reduction current transformer measurement error as 1, is realized " Zero flux ".
Embodiment 3:
As shown in figure 8, a kind of current transformer, comprising: magnetic core 1, primary coil winding 2, secondary detection coil windings 3,
Second compensation coil windings 4；
Primary coil winding 2, secondary detection coil windings 3, second compensation coil windings 4 are wound on magnetic core 1；
The both ends of primary coil winding 2 are the input terminal of zero-flux current transformer；
The Same Name of Ends of secondary detection coil windings 3 is connected with the Same Name of Ends of second compensation coil windings 4, second compensation line
The non-same polarity at the both ends and secondary detection coil windings 3 of enclosing winding 4 is the output end of zero-flux current transformer.
In use, the mode of connection shown in Fig. 4 of reference implementation example 1 is attached, embodiment 3 can achieve and embodiment
The purpose of reduction current transformer measurement error as 1, is realized " Zero flux ".
Embodiment 2 and embodiment 3, can be with when coiling secondary detection coil windings 3 and second compensation coil windings 4
By the way of Double-wire parallel wound, after coiling, by the starting point of secondary detection coil windings 3 and second compensation coil windings 4
It is attached or is attached the end of secondary detection coil windings 3 and second compensation coil windings 4, when use presses
Fig. 3 or the mode of connection shown in Fig. 4 according to embodiment 1 are attached, and current transformer only needs 3 output lines, from
And the cost for reducing current transformer is achieved the purpose that.
The preferred embodiment of the utility model is explained in detail above, for those of ordinary skill in the art,
It will change in above-mentioned specific embodiment, and these changes also should be regarded as the protection scope of the utility model.
Claims (5)
1. a kind of current transformer characterized by comprising magnetic core, primary coil winding, secondary detection coil windings, secondary
Bucking coil winding, amplifier；
The primary coil winding, the secondary detection coil windings, the second compensation coil windings are wound on the magnetic core
On；
The anode of the input terminal of the amplifier is connected with the Same Name of Ends of the secondary detection coil windings, the amplifier
The negative terminal of input terminal is connected with the non-same polarity of the secondary detection coil windings, the output end of the amplifier and described two
The non-same polarity of secondary bucking coil winding is connected；
The Same Name of Ends of the secondary detection coil windings is connected with the Same Name of Ends of the second compensation coil windings, alternatively, institute
The non-same polarity for stating secondary detection coil windings is connected with the non-same polarity of the second compensation coil windings；
The both ends of the primary coil winding are the input terminal of zero-flux current transformer；
The Same Name of Ends of the second compensation coil windings and the power ground of the amplifier are the output of zero-flux current transformer
End.
2. a kind of current transformer according to claim 1, which is characterized in that described in the same of second compensation coil windings
Name end connects load resistance with the power ground of amplifier.
3. a kind of current transformer according to claim 1 or 2, which is characterized in that the secondary detection coil windings and
Second compensation coil windings are wound on the magnetic core by the way of Double-wire parallel wound or separately winding.
4. a kind of current transformer characterized by comprising magnetic core, primary coil winding, secondary detection coil windings, secondary
Bucking coil winding；
The primary coil winding, the secondary detection coil windings, the second compensation coil windings are wound on the magnetic core
On；
The Same Name of Ends of the secondary detection coil windings is connected with the Same Name of Ends of the second compensation coil windings, described secondary
The non-same polarity of the both ends of bucking coil winding and the secondary detection coil windings is the output end of current transformer；Alternatively,
The non-same polarity of the secondary detection coil windings is connected with the non-same polarity of the second compensation coil windings, described secondary
The Same Name of Ends of the both ends of bucking coil winding and the secondary detection coil windings is the output end of current transformer；
The both ends of the primary coil winding are the input terminal of current transformer.
5. a kind of current transformer according to claim 4, which is characterized in that secondary detection coil windings and secondary
Bucking coil winding is wound on magnetic core by the way of Double-wire parallel wound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920013156.1U CN209656769U (en) | 2019-01-04 | 2019-01-04 | A kind of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920013156.1U CN209656769U (en) | 2019-01-04 | 2019-01-04 | A kind of current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN209656769U true CN209656769U (en) | 2019-11-19 |
Family
ID=68520325
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920013156.1U Expired - Fee Related CN209656769U (en) | 2019-01-04 | 2019-01-04 | A kind of current transformer |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415249A (en) * | 2020-11-09 | 2021-02-26 | 武汉大学 | Zero-flux current transformer and error modulation method |
| US11538628B2 (en) | 2019-12-02 | 2022-12-27 | Panoramic Power Ltd. | Self calibration by signal injection |
-
2019
- 2019-01-04 CN CN201920013156.1U patent/CN209656769U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11538628B2 (en) | 2019-12-02 | 2022-12-27 | Panoramic Power Ltd. | Self calibration by signal injection |
| US11705275B2 (en) * | 2019-12-02 | 2023-07-18 | Panoramic Power Ltd. | Self calibration by double signal sampling |
| CN112415249A (en) * | 2020-11-09 | 2021-02-26 | 武汉大学 | Zero-flux current transformer and error modulation method |
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Granted publication date: 20191119 |