CN217689354U - A on-spot check gauge that is used for automatic judgement wiring of mutual-inductor - Google Patents
A on-spot check gauge that is used for automatic judgement wiring of mutual-inductor Download PDFInfo
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- CN217689354U CN217689354U CN202222450002.3U CN202222450002U CN217689354U CN 217689354 U CN217689354 U CN 217689354U CN 202222450002 U CN202222450002 U CN 202222450002U CN 217689354 U CN217689354 U CN 217689354U
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Abstract
The utility model belongs to the technical field of the check gauge, a field check gauge for automatic judgment wiring of mutual-inductor is proposed, which comprises a first circuit, a second circuit and a third circuit which are respectively connected with the input end of an AD conversion unit, and a control processing management unit which is connected with the output end of the AD conversion unit; the utility model can automatically judge whether the wiring is correct or not through the first circuit, the second circuit and the third circuit which are respectively connected with the input end of the AD conversion unit and the control processing management unit which is connected with the output end of the AD conversion unit, and can check the circuit in the process of checking or overhauling test on site to prevent wiring error; meanwhile, the polarity and the transformation ratio of the mutual inductor can be correctly measured, the investment of manpower and material resources is reduced, and the method is safer, simpler and more reliable.
Description
Technical Field
The utility model belongs to the technical field of the check gauge, especially, relate to an on-spot check gauge that is used for automatic judgement wiring of mutual-inductor.
Background
The transformer is one of important devices in a power system, mainly has the function of converting high voltage or large current into low voltage or small current in proportion, and is widely applied to secondary equipment application aspects such as measuring instruments, relay protection, electric energy metering, fault recording and the like. The errors, transformation ratio and polarity of the mutual inductor are several important characteristics of the mutual inductor, and the correctness of the errors, the transformation ratio and the polarity directly influences the metering accuracy of the mutual inductor and the accuracy of other secondary relay protection devices and the like, and influences the safe and reliable operation of an electric power system. Meanwhile, related metering technical laws and regulations and related standards in the power industry all stipulate that the mutual inductor needs to be subjected to first inspection and regular scheduled inspection and maintenance tests on site. Therefore, when the first inspection and the later scheduled inspection and maintenance test of the mutual inductor are carried out, the wiring of the line needs to be ensured to be correct, the transformation ratio and the polarity of a plurality of groups of mutual inductors need to be measured, and long working time is often consumed.
The inventor finds that when the mutual inductor is subjected to field verification or overhaul tests at present, a pointer multimeter is generally adopted to select a proper range and then observe the deflection of the pointer to reflect the correctness of the polarity, the pointer is damaged or the deflection effect is not obvious due to improper range selection, so that the polarity cannot be correctly judged, whether wiring is wrong or not cannot be judged, and the safe operation of a power grid is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned problem, provide an on-spot check gauge of automatic judgement wiring for mutual-inductor, can check up or the circuit of looking into by oneself when the maintenance test at the scene, prevent the wiring mistake.
According to some embodiments, the utility model provides an on-spot check gauge of automatic judgement wiring for mutual-inductor adopts following technical scheme:
a field calibrator for automatic judgment of wiring of a mutual inductor comprises a first circuit, a second circuit, a third circuit and a control processing management unit, wherein the first circuit, the second circuit and the third circuit are respectively connected with the input end of an AD conversion unit, and the control processing management unit is connected with the output end of the AD conversion unit;
the first circuit comprises a voltage dial indicator, a first sampling unit connected with the voltage dial indicator, and a first analog circuit unit connected with the first sampling unit; the first analog circuit unit is connected with the AD conversion unit;
the second circuit comprises a current dial indicator, a second sampling unit connected with the current dial indicator and a second analog circuit unit connected with the second sampling unit; the second analog circuit unit is connected with the AD conversion unit;
the third circuit comprises a first mode switching unit, a third sampling unit connected with the first mode switching unit, a second mode switching unit connected with the third sampling unit, and a third analog circuit unit connected with the second mode switching unit; the third analog circuit unit is connected with the AD conversion unit.
Furthermore, one end of the voltage dial indicator is connected with the voltage transformer unit, and the other end of the voltage dial indicator is connected with the first sampling unit through the input terminal.
Furthermore, one end of the current dial indicator is connected with the current transformer unit, and the other end of the current dial indicator is connected with the second sampling unit through the input terminal.
Further, the first analog circuit unit, the second analog circuit unit, and the third analog circuit unit each include an amplifying circuit and a filter circuit.
Further, the control processing management unit is connected with the amplifying circuit.
Further, the control processing management unit is connected with the first mode switching unit and the second mode switching unit.
Further, the first circuit, the third circuit, the AD conversion unit and the control processing management unit form a voltage transformer error measurement circuit, a voltage transformer polarity measurement circuit and a voltage transformer transformation ratio measurement circuit;
the first circuit, the third circuit, the AD conversion unit, and the control processing management unit constitute an impedance measurement circuit.
Further, the second circuit, the third circuit, the AD conversion unit and the control processing management unit form a current transformer error measurement circuit, a current transformer polarity measurement circuit and a current transformer transformation ratio measurement circuit;
the second circuit, the third circuit, the AD conversion unit, and the control processing management unit constitute an admittance measurement circuit.
Further, the first circuit, the second circuit, the third circuit, the AD conversion unit, and the control processing management unit constitute an error measurement circuit of a three-phase combined transformer, a polarity measurement circuit of a three-phase combined transformer, and a transformation ratio measurement circuit of a three-phase combined transformer.
Furthermore, the control processing management unit is connected with a human-computer interaction unit and a communication unit.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model can automatically judge whether the wiring is correct or not through the first circuit, the second circuit and the third circuit which are respectively connected with the input end of the AD conversion unit and the control processing management unit which is connected with the output end of the AD conversion unit, and can automatically check the circuit when checking or overhauling tests are carried out on site, thereby preventing wiring errors; meanwhile, the polarity and the transformation ratio of the mutual inductor can be correctly measured, the investment of manpower and material resources is reduced, and the method is safer, simpler and more reliable.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;
fig. 2 is a circuit diagram of a first sampling unit according to embodiment 1 of the present invention;
fig. 3 is a circuit diagram of a first amplification unit according to embodiment 1 of the present invention;
fig. 4 is a circuit diagram of a first filtering unit according to embodiment 1 of the present invention;
fig. 5 is a circuit diagram of a second sampling unit according to embodiment 1 of the present invention;
fig. 6 is a circuit diagram of a second amplifying unit according to embodiment 1 of the present invention;
fig. 7 is a circuit diagram of a second filtering unit according to embodiment 1 of the present invention;
fig. 8 is a circuit diagram of a first mode switching unit according to embodiment 1 of the present invention;
fig. 9 is a circuit diagram of a third sampling unit according to embodiment 1 of the present invention;
fig. 10 is a circuit diagram of a second mode switching unit according to embodiment 1 of the present invention;
fig. 11 is a circuit diagram of a third amplifying unit according to embodiment 1 of the present invention;
fig. 12 is a circuit diagram of a third filtering unit according to embodiment 1 of the present invention;
fig. 13 is a circuit diagram of an AD conversion unit according to embodiment 1 of the present invention;
fig. 14 is a circuit diagram of a control processing management unit according to embodiment 1 of the present invention;
fig. 15 is a circuit diagram of a human-computer interaction unit according to embodiment 1 of the present invention;
fig. 16 is a circuit diagram of a communication unit according to embodiment 1 of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1:
as shown in fig. 1, the present embodiment provides a field calibration instrument for automatically judging wiring of a transformer, which includes a first circuit, a second circuit, and a third circuit respectively connected to an input terminal of an AD conversion unit, and a control processing management unit connected to an output terminal of the AD conversion unit; specifically, the AD conversion unit is configured to convert an analog signal into a digital signal; the control processing management unit is used for controlling the conversion of working states among the first circuit, the second circuit and the third circuit;
the first circuit comprises a voltage dial indicator, a first sampling unit connected with the voltage dial indicator, and a first analog circuit unit connected with the first sampling unit; the first analog circuit unit is connected with the AD conversion unit; specifically, the output secondary voltage signal of the standard voltage transformer can be measured by a voltage dial indicator, and it can be understood that, in this embodiment, the standard voltage transformer can also be referred to as a tested voltage transformer, a tested article or a voltage transformer; the first sampling unit can be used for collecting secondary voltage signals of a standard voltage transformer and converting tested high-voltage signals into low-voltage signals which can be measured by the first analog circuit unit; the first amplifying unit may be configured to amplify a voltage signal, and convert an input signal into a voltage signal that meets the accuracy requirement of the AD converting unit;
the second circuit comprises a current dial indicator, a second sampling unit connected with the current dial indicator, and a second analog circuit unit connected with the second sampling unit; the second analog circuit unit is connected with the AD conversion unit; specifically, the secondary current signal output by the standard current transformer is measured by a current dial indicator, and it can be understood that, in this embodiment, the standard current transformer may also be referred to as a current transformer to be tested, a tested article or a current transformer; the second sampling unit is used for collecting a secondary current signal of the standard current transformer and converting a tested large current signal into a current signal which can be measured by the second analog circuit unit; the second analog circuit unit is used for amplifying the current signal and converting the input signal into a voltage signal which meets the precision requirement of the AD conversion unit;
the third circuit comprises a first mode switching unit, a third sampling unit connected with the first mode switching unit, a second mode switching unit connected with the third sampling unit, and a third analog circuit unit connected with the second mode switching unit; the third analog circuit unit is connected with the AD conversion unit; it is understood that the third sampling unit includes a differential pressure sampling circuit and a differential flow sampling circuit; the first mode switching unit and the second mode switching unit may be used to select an input differential pressure signal or a differential flow signal; the third sampling unit can be used for collecting a differential pressure signal or a differential flow signal and converting the tested differential pressure signal or differential flow signal into a voltage signal which can be measured by the third analog circuit unit; the third analog circuit unit may be configured to amplify a differential pressure signal or a differential current signal, and convert an input signal into a voltage signal that the AD conversion unit satisfies a precision requirement.
One end of the voltage dial indicator is connected with the voltage transformer unit, and the other end of the voltage dial indicator is connected with the first sampling unit through the input terminal; it can be understood that the voltage transformer is a voltage transformer under test. One end of the current dial indicator is connected with the current transformer unit, and the other end of the current dial indicator is connected with the second sampling unit through the input terminal; it is understood that the current transformer is a current transformer under test.
The first analog circuit unit, the second analog circuit unit and the third analog circuit unit each include an amplifying circuit and a filter circuit, the amplifying circuit may be a program-controlled amplifying circuit, and the filter circuit may be a low-pass filter circuit, specifically, as shown in fig. 1, the first analog circuit unit includes a first amplifying unit and a first filter unit, the second analog circuit unit includes a second amplifying unit and a second filter unit, and the third analog circuit unit includes a third amplifying unit and a third filter unit; the control processing management unit is connected with the amplifying circuit; the control processing management unit is connected with the first mode switching unit and the second mode switching unit.
The first circuit, the third circuit, the AD conversion unit and the control processing management unit can form a voltage transformer error measurement circuit, a voltage transformer polarity measurement circuit and a voltage transformer transformation ratio measurement circuit; the first circuit, the third circuit, the AD conversion unit, and the control processing management unit may constitute an impedance measurement circuit.
The second circuit, the third circuit, the AD conversion unit and the control processing management unit can form a current transformer error measuring circuit, a current transformer polarity measuring circuit and a current transformer transformation ratio measuring circuit; the second circuit, the third circuit, the AD conversion unit, and the control processing management unit may constitute an admittance measurement circuit.
The first circuit, the second circuit, the third circuit, the AD conversion unit, and the control processing management unit may constitute an error measurement circuit of a three-phase combination transformer, a polarity measurement circuit of a three-phase combination transformer, and a transformation ratio measurement circuit of a three-phase combination transformer.
In other embodiments, the control processing management unit may be configured to calculate a ratio difference of the transformers, and the specific calculation may be implemented by a conventional technique or an existing technique; determining the polarity reduction, the transformer transformation ratio error or the wiring error according to the comparison between the calculated ratio difference and a preset value; the comparison between the ratio difference and the preset value is a conventional technology, for example, the polarity reduction is determined when the ratio difference is smaller than a first threshold, the transformer transformation ratio error is determined when the ratio difference is larger than the first threshold and smaller than a second threshold, the transformer polarity error is determined when the ratio difference is larger than the second threshold and smaller than a third threshold, and the wiring error is determined when the ratio difference is larger than the third threshold. The first threshold may be 20%, the second threshold may be set to 180%, and the third threshold may be set to 300%.
In other embodiments, the control processing management unit may be further connected with a human-computer interaction unit and a communication unit; the human-computer interaction unit can be used for displaying a judgment result and the like.
Specifically, the control processing management unit switches to a differential pressure measurement channel through a control relay, namely switches to differential pressure signal input ends in the first circuit and the third circuit, raises the voltage to within 5%, performs amplification and filtering processing on the voltage signal, obtains sampling data from the AD conversion unit, controls the amplification factor of an amplification circuit in the amplification unit according to the size of the sampling data to obtain more accurate sampling data, calculates parameters such as a ratio difference, and sends the parameters to the human-computer interaction unit for display. The control processing management unit is switched to a differential current measuring channel through a control relay, the differential current signal input ends of the second circuit and the third circuit increase the current to be within 5%, current signals are amplified and filtered, sampling data are obtained from the AD conversion unit, the amplification times of the amplifying circuits in the amplifying units are controlled according to the sampling data, accurate sampling data are obtained, parameters such as a ratio difference are calculated, and the parameters are sent to the human-computer interaction unit to be displayed.
In this embodiment, fig. 2 is a circuit diagram of the first sampling unit, fig. 3 is a circuit diagram of the first amplifying unit, and a _ U of the first sampling unit is connected to R28 of the first amplifying unit; fig. 4 is a circuit diagram of the first filtering unit, wherein R30 of the first filtering unit is connected to U4 pin 6 of the first amplifying unit.
And PT0_ A and PT0_ X of the first sampling unit are connected with a voltage dial indicator socket.
Fig. 5 is a circuit diagram of the second sampling unit, and fig. 6 is a circuit diagram of the second amplifying unit; the K101 pin 4 of the second sampling unit is connected with the R28 of the second amplifying unit; fig. 7 shows a circuit of a second filtering unit, wherein R30 of the second filtering unit is connected to pin 6 of the second amplifying unit U4.
And the CT0_ T0 of the second sampling unit is connected with a current dial indicator socket.
Fig. 8 is a circuit diagram of a first mode switching unit, fig. 9 is a circuit diagram of a third sampling unit, and K _ U, D _ U and K _ I of the first mode switching unit are connected to K _ U, D _ U and K _ I of the third sampling unit; FIG. 10 is a circuit diagram of the second switching element, KU and KI of the second switching element being connected to KU and KI of the third sampling element; fig. 11 is a circuit diagram of a third amplifying unit, K of which is connected to K of the second switching unit; fig. 12 is a circuit diagram of the third filtering unit, wherein R49 of the third filtering unit is connected to pin 6 of U17 of the third amplifying unit.
And the K _ UI and the D _ UI of the first mode switching unit are connected with an external differential pressure and differential flow input signal source.
Fig. 13 is a circuit diagram of the AD conversion unit; and the ADCINA0 of the AD conversion unit is connected with the U7 pin 6 of the first filter unit, the ADCINB0 of the AD conversion unit is connected with the U7 pin 6 of the second filter unit, and the ADCINA1 and the ADCINB1 of the AD conversion unit are connected with the U20 pin 6 of the third filter unit.
Fig. 14 is a circuit diagram of the control processing management unit; GPIO-00 and GPIO-01 of the control processing management unit are connected with AX _ AMP1 and AX _ AMP2 of the first amplification unit, GPIO-02 and GPIO-03 of the control processing management unit are connected with AX _ AMP1 and AX _ AMP2 of the second amplification circuit, GPIO-04, GPIO-05, GPIO-06 and GPIO-07 of the control processing management unit are connected with KD _ AMP1, KD _ AMP2, KD _ AMP3 and KD _ AMP4 of the third amplification circuit; GPIO-24-GPIO-27 of the control processing management unit is connected with an SPI port of the AD conversion unit.
Fig. 15 is a circuit diagram of the human-computer interaction unit, and fig. 16 is a circuit diagram of the communication unit; SCITXDA and SCITXDA of the man-machine interaction unit are connected with GPIO-28 and GPIO-29 of the control processing management unit, and SCITXDB of the communication unit are connected with GPIO-14 and GPIO-15 of the control processing management unit.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A field calibrator for automatic wire connection judgment of a mutual inductor is characterized by comprising a first circuit, a second circuit and a third circuit which are respectively connected with the input end of an AD conversion unit, and a control processing management unit which is connected with the output end of the AD conversion unit;
the first circuit comprises a voltage dial indicator, a first sampling unit connected with the voltage dial indicator, and a first analog circuit unit connected with the first sampling unit; the first analog circuit unit is connected with the AD conversion unit;
the second circuit comprises a current dial indicator, a second sampling unit connected with the current dial indicator, and a second analog circuit unit connected with the second sampling unit; the second analog circuit unit is connected with the AD conversion unit;
the third circuit comprises a first mode switching unit, a third sampling unit connected with the first mode switching unit, a second mode switching unit connected with the third sampling unit, and a third analog circuit unit connected with the second mode switching unit; the third analog circuit unit is connected with the AD conversion unit.
2. The on-site calibrator for automatic wire judgment of transformers according to claim 1, wherein said voltage percentage meter is connected to the voltage transformer unit at one end and to the first sampling unit through the input terminal at the other end.
3. The on-site calibrator for automatic wire connection of transformers according to claim 1, wherein said current percentage meter is connected to a current transformer unit at one end and to a second sampling unit at the other end via an input terminal.
4. The field verifier for automatic diagnostics wiring of transformers according to claim 1, wherein the first analog circuit unit, the second analog circuit unit, and the third analog circuit unit each include an amplifying circuit and a filtering circuit.
5. The field verifier for automatic diagnostics wiring of transformers according to claim 4, wherein said control process management unit is connected to said amplification circuit.
6. The on-site calibration instrument for automatic wire judgment of transformers according to claim 1, characterized in that the control processing management unit is connected with the first mode switching unit and the second mode switching unit.
7. The on-site calibrator for automatic wire connection judgment of transformers according to claim 1, wherein said first circuit, said third circuit, said AD conversion unit and said control processing management unit constitute a voltage transformer error measurement circuit, a voltage transformer polarity measurement circuit and a voltage transformer transformation ratio measurement circuit;
the first circuit, the third circuit, the AD conversion unit, and the control processing management unit constitute an impedance measurement circuit.
8. The on-site calibrator for automatic judgment of wiring of transformers according to claim 1, wherein said second circuit, said third circuit, said AD conversion unit and said control processing management unit constitute a current transformer error measurement circuit, a current transformer polarity measurement circuit and a current transformer transformation ratio measurement circuit;
the second circuit, the third circuit, the AD conversion unit, and the control processing management unit constitute an admittance measurement circuit.
9. The field calibrator for automatic wire connection of transformers according to claim 1, wherein said first circuit, said second circuit, said third circuit, said AD conversion unit, and said control processing management unit constitute an error measurement circuit of a three-phase combined transformer, a polarity measurement circuit of a three-phase combined transformer, and a transformation ratio measurement circuit of a three-phase combined transformer.
10. The on-site calibration instrument for automatic wire judgment of transformers according to claim 1, characterized in that the control processing management unit is connected with a human-computer interaction unit and a communication unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222450002.3U CN217689354U (en) | 2022-09-16 | 2022-09-16 | A on-spot check gauge that is used for automatic judgement wiring of mutual-inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222450002.3U CN217689354U (en) | 2022-09-16 | 2022-09-16 | A on-spot check gauge that is used for automatic judgement wiring of mutual-inductor |
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| Publication Number | Publication Date |
|---|---|
| CN217689354U true CN217689354U (en) | 2022-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222450002.3U Active CN217689354U (en) | 2022-09-16 | 2022-09-16 | A on-spot check gauge that is used for automatic judgement wiring of mutual-inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217689354U (en) |
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- 2022-09-16 CN CN202222450002.3U patent/CN217689354U/en active Active
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