CN214097758U - Active current transformer tester - Google Patents
Active current transformer tester Download PDFInfo
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- CN214097758U CN214097758U CN202023329510.3U CN202023329510U CN214097758U CN 214097758 U CN214097758 U CN 214097758U CN 202023329510 U CN202023329510 U CN 202023329510U CN 214097758 U CN214097758 U CN 214097758U
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Abstract
The utility model provides an active current transformer tester, it is suitable for and detects active current transformer. The active current transformer tester comprises a power supply generator, a square wave generator, a signal amplification and processor, a load, a signal processor and an oscilloscope, wherein the power supply generator can provide a first voltage, a second voltage and a third voltage. The square wave generator is electrically connected with the power supply generator. The signal amplifying and processing device is electrically connected with the square wave generator and is suitable for amplifying and processing the signal output by the square wave generator. The load is electrically connected with the signal amplification and processor and outputs primary side current, the load is electrically connected with the first cable, and the first cable is wound on the primary side of the active current transformer in a plurality of circles. The signal processor is adapted to be electrically connected to the secondary side of the active current transformer. The utility model discloses an active current transformer tester can realize the detection to active current transformer, and simple structure, and convenient to use, it is with low costs.
Description
Technical Field
The utility model relates to a test instrument field, in particular to active current transformer tester.
Background
The frequency converter detects current by using an active current transformer, and the current transformer is an instrument for converting large primary side current into small secondary side current according to the electromagnetic induction principle to measure. The current transformer is composed of a closed iron core and a winding. The current transformer needs to supply power for the difference of an internal operational amplifier when in work, a power supply and a signal interface are both high impedance, and when a system is in power-off maintenance, the current transformer is not supplied with power at the moment, so that the quality of the active current transformer is difficult to judge. Even though the frequency converter can supply power for the active current transformer, the primary side current for testing, which needs to be constructed when testing the active current transformer, is relatively large, and the primary side current for testing is not easy to construct, so that the performance of the active current transformer is difficult to accurately judge.
At present, no instrument for detecting the active current transformer exists in the domestic market. There are instruments developed abroad for detecting active current mutual inductor, but the manufactured measuring instrument has large volume, high price and complex wiring, and an external oscilloscope and corresponding software are also required for matching measurement.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing an active current transformer tester can realize the detection to active current transformer, and simple structure, convenient to use, and is with low costs.
The utility model provides an active current transformer tester, it is suitable for and detects active current transformer, active current transformer has and once inclines and the secondary side. The active current transformer tester comprises a power supply generator, a square wave generator, a signal amplification and processor, a load, a signal processor and an oscilloscope, wherein the power supply generator can provide a first voltage, a second voltage and a third voltage, and the power supply generator provides the first voltage for the secondary side of the active current transformer. The square wave generator is electrically connected with the power supply generator, and the power supply generator provides the second voltage for the square wave generator. The signal amplification and processing device is electrically connected with the square wave generator and is suitable for amplifying and processing the signal output by the square wave generator. The load is electrically connected with the signal amplification and processor, outputs primary side current, is electrically connected with a first cable, and is wound on the primary side of the active current transformer in a plurality of circles. The signal processor is adapted to be electrically connected to the secondary side of the active current transformer. The oscilloscope is electrically connected with the power supply generator, the load and the signal processor, and the power supply generator provides the third voltage for the oscilloscope.
In an exemplary embodiment of the active current transformer tester, the load is electrically connected to the oscilloscope through a second cable, a current in the second cable is a primary side current, the signal processor is electrically connected to the secondary side of the active current transformer through a third cable, and is electrically connected to the oscilloscope through a fourth cable, and a current in the third cable is a secondary side current.
In one exemplary embodiment of the active current transformer tester, the ratio of the primary side current to the secondary side current is 5000:1, 4000:1, or 6000: 1.
In an exemplary embodiment of the active current transformer tester, the signal processor is adapted to process the secondary-side current and output the processed current through the fourth cable such that a value of the current in the fourth cable is equal to a value of the primary-side current.
In an exemplary embodiment of the active current transformer tester, the first cable is wound around the primary side of the active current transformer in 6 turns.
In one illustrative embodiment of the active current transformer tester, the oscilloscope includes a waveform selection knob that is adjustable to a test position, a first position, and a second position, the test position representing testing of the oscilloscope itself, the first position representing displaying a primary side current waveform, and the second position representing displaying a secondary side current waveform.
In one exemplary embodiment of the active current transformer tester, the oscilloscope further comprises a waveform freeze button.
In one exemplary embodiment of the active current transformer tester, the oscilloscope further comprises an oscilloscope trigger indicator light.
In an exemplary embodiment of the active current transformer tester, a test cable interface is further provided on the active current transformer tester.
The utility model discloses an among the active current transformer tester, the active current transformer tester includes power generator, square wave generator, signal amplification and treater, load, signal processor and oscilloscope, through generating square wave signal to input to the load after square wave signal amplifies and handles, thereby the side electric current once of production. The load is electrically connected with the first cable, and the first cable is wound on the primary side of the active current transformer in a plurality of circles. Active current transformer's secondary side electric current can be shown by the oscilloscope after handling, and whether the performance of comparing the waveform of the primary side electric current that oscilloscope shows and secondary side electric current can judge active current transformer is normal to the realization is to active current transformer's detection, the utility model discloses an active current transformer tester's simple structure, convenient to use, it is with low costs.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings, in which:
fig. 1 is a schematic diagram of an architecture of an active current transformer tester according to an embodiment of the present invention.
Fig. 2 is a schematic physical appearance diagram of the active current transformer tester shown in fig. 1.
Fig. 3 is a waveform diagram of a primary side of an active current transformer detected by the active current transformer tester shown in fig. 1.
Fig. 4 is a diagram of a secondary side waveform of an active current transformer detected by the active current transformer tester shown in fig. 1.
In the above figures, the reference numerals used are as follows:
10 active current transformer tester
101 change-over switch
12 power supply generator
121 fuse
13 square wave generator
14 signal amplifying and processing device
15 load
151 first cable
152 second cable
16 signal processor
161 third cable
162 fourth cable
17 oscilloscope
172 waveform selection knob
173 wave form freezes button
174 oscilloscope trigger indicating lamp
18 test cable interface
200 active current transformer
201 primary side
202 secondary side
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail by referring to the following embodiments.
Fig. 1 is a schematic diagram of an architecture of an active current transformer tester according to an embodiment of the present invention, please refer to fig. 1, the active current transformer tester 10 of this embodiment is suitable for detecting an active current transformer 200, and the active current transformer 200 has a primary side 201 and a secondary side 202. The active current transformer tester 10 includes a power supply generator 12, a square wave generator 13, a signal amplification and processor 14, a load 15, a signal processor 16, and an oscilloscope 17. The power generator 12 may provide a first voltage, a second voltage, and a third voltage, wherein the power generator 12 provides the first voltage to the secondary side 202 of the active current transformer 200. The square-wave generator 13 is electrically connected to the power generator 12, and the power generator 12 supplies the square-wave generator 13 with the second voltage. The signal amplification and processing unit 14 is electrically connected to the square wave generator 13 and is adapted to amplify and process the signal output from the square wave generator 13. The load 15 is electrically connected to the signal amplification and processing unit 14, the load 15 outputs a primary side current, the load 15 is electrically connected to the first cable 151, and the first cable 151 is wound around the primary side 201 of the active current transformer 200 in a plurality of turns. The signal processor 16 is adapted to be electrically connected to the secondary side 202 of the active current transformer 200. The oscilloscope 17 is electrically connected to the power generator 12, the load 15, and the signal processor 16, and the power generator 12 supplies the oscilloscope 17 with the third voltage.
More specifically, the power generator 12 is connected to an external alternating current of 180 to 230 volts (V), and a fuse 121 is provided on a cable connected to the power generator 12.
The square wave generator 13 is suitable for generating a square wave signal, and the frequency of the generated square wave signal is 1000 Hertz (HZ) in the embodiment, but the present invention is not limited thereto, and the frequency of the generated square wave signal can be adjusted according to actual requirements.
The signal amplification and processing unit 14 amplifies the weak signal generated by the square-wave generator 13 into an enhanced signal, which generates a current when input to the load 15.
In this embodiment, the first cable 151 is wound around the primary side 201 of the active current transformer 200 for 6 turns, and the effect of winding the first cable 151 for 6 turns is equivalent to the effect that the primary side current is increased by 6 times. The number of turns of the first cable 151 is not limited to this embodiment, and may be other than 6 turns.
The load 15 is electrically connected to the oscilloscope 17 through the second cable 152, the current in the second cable 152 is a primary side current, the signal processor 16 is electrically connected to the secondary side 202 of the active current transformer 200 through the third cable 161, and is electrically connected to the oscilloscope 17 through the fourth cable 162, and the current in the third cable 161 is a secondary side current.
In this embodiment, the ratio of the primary-side current to the secondary-side current is 5000: 1.
It should be noted that, the ratio of the primary-side current to the secondary-side current is not limited to this embodiment, and in other embodiments, the ratio of the primary-side current to the secondary-side current may also be 4000:1 or 6000:1, which may be adjusted according to actual requirements. The switch in fig. 1 is used for switching the applicable ratio of the primary-side current to the secondary-side current.
The signal processor 16 is adapted to process the secondary-side current and output the secondary-side current through the fourth cable 162, so that the value of the current in the fourth cable 162 is equal to the value of the primary-side current, and thus the waveform of the current input to the oscilloscope 17 at the primary side is substantially the same as the waveform of the current input to the oscilloscope 17 at the secondary side.
Fig. 2 is a schematic physical appearance diagram of the active current transformer tester shown in fig. 1, please refer to fig. 2, the oscilloscope 17 includes a waveform selection knob 172, and the waveform selection knob 172 can be adjusted to a test position, a first position and a second position, the test position represents the self waveform of the test oscilloscope 17, the first position represents displaying the primary side current waveform, and the second position represents displaying the secondary side current waveform.
The oscilloscope 17 further comprises a waveform freezing button 173 and an oscilloscope trigger indicator light 174, the output of the oscilloscope 17 is dynamic waveforms, and after the waveform freezing button 173 is pressed, the waveforms displayed by the oscilloscope 17 are frozen and static. When the oscilloscope trigger indicator light 174 is on, it indicates that the oscilloscope 17 is powered on and can work.
The active current transformer tester 10 is further provided with a test cable interface 18, and the test cable interface 18 can be connected with a cable.
In the present embodiment, the first voltage is positive and negative 24 volts (V), the second voltage is positive and negative 5 volts (V), and the third voltage is positive and negative 9 volts (V), but the present invention is not limited thereto.
Fig. 3 is a waveform diagram of a primary side of an active current transformer detected by the active current transformer tester shown in fig. 1, fig. 4 is a waveform diagram of a secondary side of the active current transformer detected by the active current transformer tester shown in fig. 1, please refer to fig. 1, fig. 3 and fig. 4 together, when the active current transformer 200 is detected by the active current transformer tester 10, the power generator 12 supplies power to the square wave generator 13, the oscilloscope 17 and the active current transformer 200, the square wave signal generated by the square wave generator 13 is processed and amplified by the signal amplification and processor 14 and then input to the load 15, the first cable 151 electrically connected to the load 15 is wound on a primary side 201 of the active current transformer 200, and the load 15 outputs a primary side current, wherein a waveform of the primary side current can be displayed by the oscilloscope 17. The secondary side current output by the active current transformer 200 is amplified by the signal processor 16 and then displayed by the oscilloscope 17. Since the signal processor 16 processes the secondary-side current, the value of the current in the fourth cable 162 is equal to the value of the primary-side current, and as can be seen from fig. 3 and 4, the waveform of the current input to the oscilloscope 17 at the primary side is substantially the same as the waveform of the current input to the oscilloscope 17 at the secondary side, which indicates that the performance of the active current transformer 200 is normal, and if the waveform in fig. 3 or 4 is severely distorted, the active current transformer 200 fails.
The utility model discloses an active current transformer tester has following advantage at least:
1. the utility model discloses an among the active current transformer tester, the active current transformer tester includes power generator, square wave generator, signal amplification and treater, load, signal processor and oscilloscope, through generating square wave signal to input to the load after square wave signal amplifies and handles, thereby the side electric current once of production. The load is electrically connected with the first cable, and the first cable is wound on the primary side of the active current transformer in a plurality of circles. Active current transformer's secondary side electric current can be shown by the oscilloscope after handling, and whether the performance of comparing the waveform of the primary side electric current that oscilloscope shows and secondary side electric current can judge active current transformer is normal to the realization is to active current transformer's detection, the utility model discloses an active current transformer tester's simple structure, convenient to use, it is with low costs.
2. In an embodiment of the active current transformer tester of the present invention, a ratio of the primary side current to the secondary side current may be 5000:1, 4000:1, or 6000:1, and may be adjusted according to actual requirements, and is flexible to use.
3. The utility model discloses an in the embodiment of active current transformer tester, still be provided with the wave form on the oscilloscope and freeze the button, conveniently observe the wave form.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An active current transformer tester (10) adapted to test an active current transformer (200), the active current transformer (200) having a primary side (201) and a secondary side (202), the active current transformer tester (10) comprising:
a power generator (12) capable of providing a first voltage, a second voltage and a third voltage, wherein the power generator (12) provides the first voltage to the secondary side (202) of the active current transformer (200);
the square wave generator (13) is electrically connected with the power supply generator (12), and the power supply generator (12) provides the second voltage for the square wave generator (13);
the signal amplifying and processing device (14) is electrically connected with the square wave generator (13) and is suitable for amplifying and processing the signal output by the square wave generator (13);
a load (15) electrically connected to the signal amplification and processing unit (14), wherein the load (15) outputs a primary side current, the load (15) is electrically connected to a first cable (151), and the first cable (151) is wound around the primary side (201) of the active current transformer (200) in a plurality of turns;
a signal processor (16) adapted to be electrically connected with the secondary side (202) of the active current transformer (200); and
and the oscilloscope (17) is electrically connected with the power supply generator (12), the load (15) and the signal processor (16), and the power supply generator (12) provides the oscilloscope (17) with the third voltage.
2. The active current transformer tester (10) of claim 1, wherein the load (15) is electrically connected to the oscilloscope (17) through a second cable (152), the current in the second cable (152) is a primary current, the signal processor (16) is electrically connected to the secondary side (202) of the active current transformer (200) through a third cable (161) and to the oscilloscope (17) through a fourth cable (162), and the current in the third cable (161) is a secondary current.
3. The active current transformer tester (10) of claim 2, wherein a ratio of the primary-side current to the secondary-side current is 5000:1, 4000:1, or 6000: 1.
4. The active current transformer tester (10) of claim 2, wherein the signal processor (16) is adapted to process the secondary-side current and output it via the fourth cable (162) such that the magnitude of the current in the fourth cable (162) is equal to the magnitude of the primary-side current.
5. The active current transformer tester (10) of claim 1, wherein the first cable (151) is disposed in 6 turns around the primary side (201) of the active current transformer (200).
6. The active current transformer tester (10) of claim 1, wherein the oscilloscope (17) comprises a waveform selection knob (172), the waveform selection knob (172) adjustable to a test position, a first position, and a second position, the test position representing testing the oscilloscope (17) for its own waveform, the first position representing displaying a primary side current waveform, and the second position representing displaying a secondary side current waveform.
7. The active current transformer tester (10) of claim 6, wherein the oscilloscope (17) further comprises a waveform freeze button (173).
8. The active current transformer tester (10) of claim 7, wherein the oscilloscope (17) further comprises an oscilloscope trigger indicator light (174).
9. The active current transformer tester (10) of claim 1, wherein the active current transformer tester (10) is further provided with a test cable interface (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023329510.3U CN214097758U (en) | 2020-12-30 | 2020-12-30 | Active current transformer tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023329510.3U CN214097758U (en) | 2020-12-30 | 2020-12-30 | Active current transformer tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214097758U true CN214097758U (en) | 2021-08-31 |
Family
ID=77436677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023329510.3U Active CN214097758U (en) | 2020-12-30 | 2020-12-30 | Active current transformer tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214097758U (en) |
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2020
- 2020-12-30 CN CN202023329510.3U patent/CN214097758U/en active Active
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