CN210982714U - Current transformer polarity remote calibration device - Google Patents
Current transformer polarity remote calibration device Download PDFInfo
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- CN210982714U CN210982714U CN201921555089.2U CN201921555089U CN210982714U CN 210982714 U CN210982714 U CN 210982714U CN 201921555089 U CN201921555089 U CN 201921555089U CN 210982714 U CN210982714 U CN 210982714U
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Abstract
The utility model relates to a current transformer polarity remote calibration device, which comprises a host and a slave; the host is connected with the secondary side of the current transformer to be tested through a test wire, and the slave is connected with the far-end primary side of the current transformer to be tested through a test wire; the master machine sends a measurement command to the slave machine through wireless transmission, the slave machine responds to the wireless measurement request command sent by the master machine in real time, and the electric current rising device is controlled to rise to a preset current value according to the command. The utility model discloses satisfying under the condition of the remote testing degree of accuracy, be applied to the field test. Not only can the tester that significantly reduces improve work efficiency, but also avoided the interference of test wire.
Description
Technical Field
The utility model relates to a current transformer test field, concretely relates to long-range calibration equipment of current transformer polarity.
Background
At present, two conventional detection methods of the polarity of the current transformer are ⑴ direct current method and ⑵ alternating current method.
⑴ direct current method, wherein a mechanical ammeter is connected in series in a CT secondary circuit, one person instantly connects two dry batteries at two ends of a CT body L1 and L2, one person uses a mechanical red meter pen in the secondary circuit to connect with A, B, C of the inflow device, and a black meter pen is connected with the N end of each winding to measure whether the CT secondary circuit current is positive bias.
⑵ communication method:
l2 of a primary coil and a secondary coil of the current transformer and a secondary side K2 are connected by a lead, alternating voltage of 1-5V is conducted on the secondary side, the numerical values of U1 (K1-K2), U2 (L1-L2) and U3 (L1-K1) are measured by an alternating voltage meter below 10V, if U3= U1-U2, the polarity is reduced, and U3= U1+ U2, the numerical value of U2 is very small and U3 is very close to U1 for the current transformer with the transformation ratio value exceeding 10, so that the method is not easy to distinguish during measurement, and the polarity is generally not suitable to be measured by the method.
A direct current method: because the traditional mechanical ammeter has many functions and is not used when the polarity is verified, and the gear is often required to be switched, the slight deflection of the pointer is required to be observed when in measurement, and 3 persons are usually required to finish the work of measuring the polarity of the CT, which brings great difficulty to the polarity verification. The exchange method comprises the following steps: the measurement result is not well distinguished during measurement, and the polarity is generally not suitable to be measured by adopting the method.
Disclosure of Invention
In view of this, the utility model aims at providing a long-range calibration equipment of current transformer polarity can reduce the tester, improves work efficiency, has still avoided the interference of test wire moreover
In order to realize the purpose, the utility model adopts the following technical scheme:
a current transformer polarity remote calibration device comprises a host and a slave; the host is connected with the secondary side of the current transformer to be tested through a test wire, and the slave is connected with the far-end primary side of the current transformer to be tested through a test wire; the master machine sends a measurement command to the slave machine through wireless transmission, the slave machine responds to the wireless measurement request command sent by the master machine in real time, and the electric current rising device is controlled to rise to a preset current value according to the command.
Furthermore, the host comprises a battery power supply module, a first wireless communication module, a first liquid crystal display module, a first signal acquisition and processing module and a host central control module; the host central control module is respectively connected with the battery power supply module, the first wireless communication module, the first liquid crystal display module and the first signal acquisition and processing module; and the host central control module is connected with the secondary side of the current transformer to be tested through the first signal acquisition and processing module.
Furthermore, the slave machine comprises a power supply module, a second wireless communication module, a second liquid crystal display module, a second acquisition processing module, a slave machine central control module and a large current output module; the slave central control module is connected with the power supply module, the second wireless communication module, the second liquid crystal display module, the second acquisition processing module and the large-current output module respectively; and the slave central control module is connected with the primary side of the current transformer to be tested through the second signal acquisition and processing module.
Further, the high-current output module comprises a relay, a voltage regulator, a first current transformer, a current booster and a second current transformer which are connected in sequence; the relay is connected with the power supply module.
Compared with the prior art, the utility model following beneficial effect has:
the utility model discloses satisfying under the condition of the remote testing degree of accuracy, be applied to the field test. Not only can the tester that significantly reduces improve work efficiency, but also avoided the interference of test wire.
Drawings
Fig. 1 is a schematic diagram of the wireless communication field simulation of the host and the slave according to the present invention;
fig. 2 is a schematic block diagram of a circuit host according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a circuit slave according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a slave device according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a host MCU according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a host SCU according to an embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
Referring to fig. 1, the present embodiment provides a current transformer polarity remote calibration apparatus, including a master and a slave; the host is connected with the secondary side of the current transformer to be tested through a test wire, and the slave is connected with the far-end primary side of the current transformer to be tested through a test wire; the master machine sends a measurement command to the slave machine through wireless transmission, the slave machine responds to the wireless measurement request command sent by the master machine in real time, and the electric current rising device is controlled to rise to a preset current value according to the command. The host computer collects secondary side signals of the CT in real time, the slave computer collects primary side signals of the CT and sends the data back to the host computer through wireless communication, and the host computer carries out operation processing according to the received and collected data to calculate parameters such as polarity, variable ratio and the like of the current transformer.
Referring to fig. 2, in this embodiment, the host includes a battery power supply module, a first wireless communication module, a first liquid crystal display module, a first signal acquisition and processing module, and a host central control module; the host central control module is respectively connected with the battery power supply module, the first wireless communication module, the first liquid crystal display module and the first signal acquisition and processing module; and the host central control module is connected with the secondary side of the current transformer to be tested through the first signal acquisition and processing module.
Referring to fig. 3, in the present embodiment, the slave includes a power supply module, a second wireless communication module, a second liquid crystal display module, a second acquisition processing module, a slave central control module, and a high current output module; the slave central control module is connected with the power supply module, the second wireless communication module, the second liquid crystal display module, the second acquisition processing module and the large-current output module respectively; and the slave central control module is connected with the primary side of the current transformer to be tested through the second signal acquisition and processing module.
In this embodiment, the large current output module includes a relay, a voltage regulator, a first current transformer, a current booster and a second current transformer, which are connected in sequence; the relay is connected with the power supply module.
The above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (4)
1. The utility model provides a long-range calibration equipment of current transformer polarity which characterized in that: the system comprises a host and a slave; the host is connected with the secondary side of the current transformer to be tested through a test wire, and the slave is connected with the far-end primary side of the current transformer to be tested through a test wire; the master machine sends a measurement command to the slave machine through wireless transmission, the slave machine responds to the wireless measurement request command sent by the master machine in real time, and the electric current rising device is controlled to rise to a preset current value according to the command.
2. The current transformer polarity remote verification device according to claim 1, wherein: the host comprises a battery power supply module, a first wireless communication module, a first liquid crystal display module, a first signal acquisition processing module and a host central control module; the host central control module is respectively connected with the battery power supply module, the first wireless communication module, the first liquid crystal display module and the first signal acquisition and processing module; and the host central control module is connected with the secondary side of the current transformer to be tested through the first signal acquisition and processing module.
3. The current transformer polarity remote verification device according to claim 1, wherein: the slave machine comprises a power supply module, a second wireless communication module, a second liquid crystal display module, a second acquisition processing module, a slave machine central control module and a large current output module; the slave central control module is connected with the power supply module, the second wireless communication module, the second liquid crystal display module, the second acquisition processing module and the large-current output module respectively; and the slave central control module is connected with the primary side of the current transformer to be tested through the second signal acquisition and processing module.
4. The current transformer polarity remote verification device according to claim 3, wherein: the high-current output module comprises a relay, a voltage regulator, a first current transformer, a current booster and a second current transformer which are connected in sequence; the relay is connected with the power supply module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921555089.2U CN210982714U (en) | 2019-09-19 | 2019-09-19 | Current transformer polarity remote calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921555089.2U CN210982714U (en) | 2019-09-19 | 2019-09-19 | Current transformer polarity remote calibration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210982714U true CN210982714U (en) | 2020-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921555089.2U Active CN210982714U (en) | 2019-09-19 | 2019-09-19 | Current transformer polarity remote calibration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210982714U (en) |
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2019
- 2019-09-19 CN CN201921555089.2U patent/CN210982714U/en active Active
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