CN210954187U - Wireless transformation ratio tester for mutual inductor - Google Patents
Wireless transformation ratio tester for mutual inductor Download PDFInfo
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- CN210954187U CN210954187U CN201921044833.2U CN201921044833U CN210954187U CN 210954187 U CN210954187 U CN 210954187U CN 201921044833 U CN201921044833 U CN 201921044833U CN 210954187 U CN210954187 U CN 210954187U
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Abstract
The utility model discloses a wireless transformation ratio tester of mutual inductor, which comprises a signal source and a testing end, wherein the signal source and the testing end are arranged in a split manner, and the signal source is arranged on the primary side of the mutual inductor and comprises a signal source generating circuit, a signal sampling processing circuit, a central processing unit I and a wireless module I; the testing end is arranged on the secondary side of the mutual inductor and is in wireless communication with the signal source to complete the processes of controlling the output of the signal source and synchronously testing the signal source and the testing end, the testing end comprises a signal processing circuit, a second central processing unit, a voltage and current input port, a touch screen display and a second wireless module, the touch screen display is connected with the second central processing unit, and the touch screen display acquires a triggering testing signal of a user and sends the signal to the second central processing unit. The utility model discloses a signal source and test end components of a whole that can function independently design, the mutual-inductor once can conveniently be arranged in to the signal source, and the mutual-inductor secondary side is arranged in to the test end, accomplishes the process of signal source control output, signal source and test end synchronous test through radio communication.
Description
Technical Field
The utility model relates to an electric power wiring inspection field specifically is a wireless transformation ratio tester of mutual-inductor.
Background
Transformers used in power systems function as high voltage isolation and scale voltage/current conversion. The voltage/current signal with accurate proportion to the primary loop voltage/current is provided for an automatic device for electrical measurement, electric energy metering and protection, and is an important component of the electric energy metering device, and the error test of the change of the voltage/current transformer is finished by a manufacturer during a factory test or is carried out in a test room. The field test of the transformation ratio of the voltage/current transformer belongs to the inspection property, the turn ratio is mainly inspected, the field transformation ratio inspection experiment of the voltage/current transformer during the handover and after the winding replacement is taken as an important test item by the regulation, and the current transformation ratio test mostly adopts a method for simulating the actual operation of the transformer: outputting current at a current transformer by using 1 voltage regulator and 1 current booster, and measuring the magnitude of the current flowing at a time and a second time by using two current meters respectively; or the voltage is output by the booster at the voltage transformer for the first time, and then the voltage is measured by the two voltmeters for the second time. The equipment is complicated to connect, and with the increase of transformation ratio, the field current is required to be increased to hundreds of amperes or the voltage is required to be increased to a very high level, so that a lot of inconvenience exists in the test.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a wireless transformation ratio tester of mutual-inductor to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a wireless transformation ratio tester of a mutual inductor comprises a signal source and a testing end, wherein the signal source and the testing end are arranged in a split mode, the signal source is arranged on the primary side of the mutual inductor and comprises a signal source generating circuit, a voltage and current signal sampling processing circuit, a first central processing unit and a first wireless module; the testing end is arranged on the secondary side of the mutual inductor and is in wireless communication with a signal source to finish signal source output and synchronous testing of the signal source and the testing end, the testing end comprises a signal processing circuit, a second central processing unit, a voltage and current input port, a touch screen display and a second wireless module, the touch screen display is connected with the second central processing unit, acquires a triggering testing signal of a user and sends the signal to the second central processing unit, and the second central processing unit sends a testing instruction to the signal source through the second wireless module; the secondary side of the mutual inductor collects signals through a voltage current input port, the voltage current input port is connected with a signal processing circuit, and the signal processing circuit acquires the signals and carries out filtering, shaping and amplification processing on the signals; the signal processing circuit is connected with the second central processing unit, and the signal processing circuit processes the signal and then sends the signal to the second central processing unit, and the signal is displayed by the second central processing unit through the touch screen display.
Preferably, the signal source is in wireless communication with the test end through the first wireless module, and the central processing unit in the signal source analyzes the instruction transmitted by the first wireless module when receiving the instruction, and opens the signal source generating circuit according to the instruction.
Preferably, the signal source has a set of current transformers, a set of voltage transformers and seven connecting terminals, one end of a signal source generating circuit of the signal source is connected with the connecting terminals, the other end of the signal source generating circuit is connected with the signal sampling processing circuit, one side of the signal source generating circuit outputs signals to the corresponding connecting terminals, the other side of the signal source generating circuit outputs signals to the signal sampling processing circuit, the signal sampling processing circuit processes the signals when receiving the signals, and the signal sampling processing circuit is connected with the first central processing unit and sends the processed signals to the first central processing unit for processing.
Preferably, the three current jacks at the test end are connected in a pincer manner at the secondary current of the transformer, so that the transformation ratio of the three-phase current transformer can be measured by one-time wiring without disconnecting a circuit or externally connecting a power supply.
Preferably, three groups of voltage jacks at the test end are connected with the transformer for the second time, and the transformation ratio of the three-phase voltage transformer can be measured by one-time wiring without an external power supply.
Preferably, an H-bridge SPWM module manufactured according to a DC sinusoidal inversion technique is disposed inside the signal source, and converts the internal DC signal into a sinusoidal signal to be outputted as a voltage source or a current source.
Preferably, the signal source can directly measure the magnitude of the output current/voltage sine wave signal through a current/voltage transformer.
Preferably, the measurement value of the test end at the same time as the signal source is used for calculating the transformation ratio.
Preferably, the test end utilizes a serial wireless communication technology, the test end sends a signal output command to control the signal source to output a signal, and sends a synchronous measurement command after the 2s signal source output is stable, the middle transmission delay is eliminated, and the test section and the signal source start measurement at the same time.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a signal source and test end components of a whole that can function independently design, the signal source can conveniently be arranged in the mutual-inductor and once incline, the test end is arranged in the mutual-inductor secondary side, accomplish the process of signal source output, signal source and test end synchronous test through radio communication, after the complete test of once, can measure the transformation ratio of three-phase current/voltage transformer to can pass through the form visual display with the test result; when the wireless transformation ratio tester of the mutual inductor measures, the test end utilizes the serial wireless communication technology to control the signal source: after the test terminal is started, whether the wireless communication connection with the signal source is normal is checked, after the user clicks the test at the test terminal to start, the test end sends an output command to the signal source, the signal source switches sine wave current/voltage signals to be output to the corresponding wiring terminals on the primary side of the three-phase current/voltage transformer according to the command after receiving the command, and tells the test end that the command has been received, after the 2s signal output is stable, the test end sends a synchronous measurement command, and after the signal source receives the command, removing the intermediate transmission delay, starting measurement at the same time by the test end and the signal source, measuring an internal output signal by the signal source, measuring a secondary side pincerlike input line of the current transformer and a secondary side voltage input line of the voltage transformer by the test end, sending a result to the test end by the signal source after the measurement is finished, storing the results by the test end, and then continuously sending a test command of the next mutual sensor. After the test of all the three-phase voltage current transformers is finished, the test end calculates the test results of all the transformers to obtain a six-phase transformation ratio result.
Drawings
Fig. 1 is a schematic overall structure diagram of a signal source according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an overall structure of a testing terminal according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an internal structure of a signal source according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an internal structure of a testing terminal according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a signal source generating circuit of a signal source according to an embodiment of the present invention;
fig. 6 is a signal sampling processing circuit of a signal source according to an embodiment of the present invention;
in the figure: signal source six groups of 7 terminals: 1. 2 is used for A phase CT output; 3. 4 is used for B-phase CT output; 5. 6 is used for C-phase CT output; 1. 7 is used for outputting the phase A PT; 3. 7 is used for B-phase PT output; 5. 7 is used for outputting the C-phase PT; 8. a first wireless module interface; 9. a signal source; 10. a current input port I; 11. a current input port II; 12. a current input port III; 13. the high end of the voltage input is one; 14. The voltage is input into a second high end; 15. the voltage is input into a high end three; 16. a voltage input low side; 17. a second wireless module interface; 18. a display screen interface; 19. a test end; 20. a first central processing unit; 21. a first wireless module; 22. a built-in battery; 23. a DCDC boost module; 24. an H bridge SPWM module; 25. a signal sampling processing circuit; 26. six-path relay; 27. a wiring terminal; 28. a signal source generating circuit; 29. a second central processing unit; 30. a second wireless module; 31. a signal processing circuit; 32. a voltage current input port; 33. a touch screen display;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Referring to fig. 1, the present invention provides a technical solution: a wireless transformation ratio tester of a mutual inductor comprises a signal source 9 and a test end 19, wherein an external interface of the signal source 9 comprises: the phase A PT outputs a high end 1 and a low end 7; the phase B PT outputs a high end 3 and a low end 7; the C phase PT outputs a high end 5 and a low end 7; the phase A CT outputs a high end 1 and a low end 2; the phase B CT outputs a high end 3 and a low end 4; the C-phase CT outputs a high end 5 and a low end 6, which are used to output signals. And a wireless module interface I8 for communication.
Referring to fig. 2, the external interface of the testing terminal 19 includes: a, B, C three-phase current input port I10, input port II 11 and input port III 12 which are clamped on a current loop of the mutual inductor secondary side electric energy meter, A, B, C three-phase voltage input high-end I13, input high-end II 14, input high-end III 15 and input low-end 16 which are connected with a voltage connection port of the mutual inductor secondary side electric energy meter, a wireless module interface II 17 and a display screen interface 18.
Referring to fig. 3, fig. 3 is an internal structure diagram of a signal source, the signal source includes a first central processing unit 20, a first wireless module 21, a signal source generating circuit 28, a connection terminal 27 and a signal sampling processing circuit 25, the first central processing unit 20 analyzes an instruction transmitted from the first wireless module 21 and then turns on the signal source generating circuit 28 according to the instruction, the signal source generating circuit 28 includes: the built-in battery 22 supplies power to the DCDC boost module 23, and a DC direct-current signal output by the DCDC boost module 23 is connected to the H-bridge SPWM module 24; one side of a voltage/current sine wave signal output by the H-bridge SPWM module 24 is connected to a wiring terminal through a six-path relay 26, the other side of the voltage/current sine wave signal is connected to a signal sampling processing circuit 25, and the processed signal is sent to a central processing unit for calculation; the central processor 20 controls the DCDC boost module 23 to be turned on and which of the six relays 26 is turned on.
Referring to fig. 4, fig. 4 is a diagram of an internal structure of a testing end, the testing end includes a touch screen display 33, a second central processing unit 29, a second wireless module 30, a voltage/current input port 32, and a signal processing line 31, the external part of the testing end triggers a test through the touch screen display 33, the test signal is transmitted to the second central processing unit 29, the second central processing unit 29 sends a test instruction to a signal source through the second wireless module 30, then the signal is acquired by the voltage/current input port 32 on the secondary side of the transformer, and the voltage/current input port 32 is connected to the signal processing line 31 for filtering, shaping, amplifying and other processing; after signal processing, the signal is connected to a second central processing unit 29 for calculation; the second central processing unit 29 is connected to the touch screen display 33 for displaying the measurement information.
Referring to fig. 5, in the signal sampling processing circuit of the signal source shown in fig. 5, the signal source generating circuit 28 outputs a signal, the signal is reduced by the built-in current/voltage transformer, the sampled signal is sampled, the signal is amplified by the operational amplifier circuit after being processed, the amplified signal is subjected to secondary filtering, and finally the filtered signal is sent to the first central processing unit 20 for operation processing.
Referring to fig. 6, fig. 6 shows the signal sampling processing circuit at the testing end, where a signal input from the signal terminal is sampled by the sampling circuit, and then the sampled signal is amplified and filtered, and finally the filtered signal is sent to the first cpu 20 for operation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The wireless transformation ratio tester of the mutual inductor is characterized by comprising a signal source (9) and a test end (19), wherein the signal source (9) and the test end (19) are arranged in a split mode, the signal source (9) is arranged on the primary side of the mutual inductor and comprises a signal source generating circuit (28), a signal sampling processing circuit (25), a first central processing unit (20) and a first wireless module (21); the testing end (19) is arranged on the secondary side of the mutual inductor and is in wireless communication with the signal source (9) to finish the output of the signal source (9), and the signal source (9) and the testing end (19) are synchronously tested, wherein the testing end (19) comprises a signal processing circuit (31), a second central processing unit (29), a voltage and current input port (32), a touch screen display (33) and a second wireless module (30); the touch screen display (33) is connected with the second central processing unit (29), acquires a triggering test signal of a user, sends the signal to the second central processing unit (29), and sends a test instruction to the signal source (9) through the second central processing unit (29) through the second wireless module (30); the secondary side of the transformer is used for collecting signals through a voltage current input port (32), the voltage current input port (32) is connected with a signal processing circuit (31), and the signal processing circuit (31) is used for acquiring the signals and filtering, shaping and amplifying the signals; the signal processing circuit (31) is connected with the second central processing unit (29), the signal processing circuit (31) processes the signal and then sends the signal to the second central processing unit (29), and the signal is displayed by the second central processing unit (29) through the touch screen display (33).
2. The instrument transformer wireless transformation ratio tester of claim 1, wherein: the signal source (9) is in wireless communication with the test end (19) through the first wireless module (21), and a central processing unit in the signal source (9) analyzes the instruction transmitted by the first wireless module (21) when receiving the instruction, and opens the signal source generating circuit (28) according to the instruction.
3. The instrument transformer wireless transformation ratio tester of claim 1, wherein: the signal source (9) is provided with a group of current transformers, a group of voltage transformers and seven wiring terminals (27), one end of a signal source generating circuit (28) of the signal source (9) is connected with the wiring terminals (27), the other end of the signal source generating circuit is connected with the signal sampling processing circuit (25), one side of the signal source generating circuit outputs signals to the corresponding wiring terminals (27), the other side of the signal source generating circuit outputs signals to the signal sampling processing circuit (25), the signal sampling processing circuit (25) processes the signals when receiving the signals, the signal sampling processing circuit (25) is connected with the first central processing unit (20), and the signal sampling processing circuit sends the processed signals to the first central processing unit for processing.
4. The instrument transformer wireless transformation ratio tester of claim 1, wherein: an H-bridge SPWM module (24) manufactured according to a DC sine inversion technology is arranged inside the signal source (9), and an internal DC direct current signal is converted into a sine wave signal to be output as the signal source.
5. The instrument transformer wireless transformation ratio tester of claim 1, wherein: the signal source (9) can directly measure the magnitude of the sine wave signals of the output voltage and the current of the signal source through a voltage and current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921044833.2U CN210954187U (en) | 2019-07-05 | 2019-07-05 | Wireless transformation ratio tester for mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921044833.2U CN210954187U (en) | 2019-07-05 | 2019-07-05 | Wireless transformation ratio tester for mutual inductor |
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| Publication Number | Publication Date |
|---|---|
| CN210954187U true CN210954187U (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921044833.2U Active CN210954187U (en) | 2019-07-05 | 2019-07-05 | Wireless transformation ratio tester for mutual inductor |
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| CN (1) | CN210954187U (en) |
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- 2019-07-05 CN CN201921044833.2U patent/CN210954187U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A wireless transformation ratio tester for transformer Effective date of registration: 20220307 Granted publication date: 20200707 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: XI'AN SHUANGYING TECHNOLOGY CO.,LTD. Registration number: Y2022610000079 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230511 Granted publication date: 20200707 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: XI'AN SHUANGYING TECHNOLOGY CO.,LTD. Registration number: Y2022610000079 |