Transformer parameter comprehensive tester

Abstract

The invention relates to the technical field of transformer testing, and discloses a transformer parameter comprehensive tester which comprises an anti-interference shell, a power socket, a grounding pole, a USB interface, an RS232 communication interface, a power switch, an internal and external power supply change-over switch, a display touch screen, a micro printer, a wiring terminal panel, a Bluetooth communication module, a communication bus and an internal power supply. By integrating the anti-interference shell, the power socket, the grounding pole, the USB interface, the RS232 communication interface, the power switch, the internal and external power supply change-over switch, the display touch screen, the miniprinter, the wiring terminal panel, the Bluetooth communication module, the communication bus and the internal power supply, all test items can be completed through one-time wiring, and the workload of field test personnel is reduced; the testing accuracy and reliability are improved, the influence of external electromagnetic interference on the testing result is effectively reduced through the anti-interference shell and the shielding measure, the requirements of different occasions and different transformer parameter testing can be met, and the testing device has wide application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of transformer testing, and in particular to a transformer parameter comprehensive tester. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. Transformers can be divided into power transformers and special transformers according to their uses. Power transformers are mainly used in power transmission and distribution lines to change the AC voltage to meet the needs of different users. Special transformers are used in special fields such as smelting, electrical processing, electric traction, communications, and automatic control. Its main components are primary coils, secondary coils, and iron cores (magnetic cores). The main functions of transformers are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. Transformers are basic equipment for power transmission and distribution, and are widely used in industry, agriculture, transportation, urban communities, and other fields. In the production, installation, and maintenance of transformers, it is crucial to accurately measure their parameters.

[0003] Traditional transformer parameter testing methods usually require a variety of different equipment, which is complicated to operate and inefficient. In addition, due to electromagnetic interference in the test environment, the accuracy of the test results is often affected and cannot meet the needs of comprehensive transformer parameter testing.

[0004] Therefore, we propose a comprehensive transformer parameter tester. Summary of the invention

[0005] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a transformer parameter comprehensive tester.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a transformer parameter comprehensive tester, comprising an anti-interference shell, a power socket, a grounding column, a USB interface, an RS232 communication interface, a power switch, an internal and external power conversion switch, a display touch screen, a micro printer, a terminal panel, a Bluetooth communication module, a communication bus and an internal power supply. The anti-interference shell is designed with shielding measures to improve the anti-interference ability of the whole machine. The power socket has a switch and a safety compartment. The grounding column is used to connect to the earth when the tester is in use. The USB interface is used for an external mouse, a U disk or other USB devices. The RS232 communication interface is used to connect an external printer. The internal and external power conversion switch is used to switch the external power output to the internal power output when using low-voltage short-circuit impedance.

[0007] Preferably, the display touch screen is used to control the instrument status and display various parameters.

[0008] Preferably, the micro printer is used to print various test parameters.

[0009] Preferably, the terminal panel is used to connect test wires with different functions.

[0010] Preferably, the terminal panel includes high-voltage side terminals, low-voltage side terminals and a measurement circuit.

[0011] Preferably, the measuring circuit is designed using isolation technology to eliminate interference between various test functions, and the measuring circuit simultaneously uses hardware and software filtering technology to improve the anti-interference ability of the measuring function.

[0012] Preferably, the Bluetooth communication module has a wireless communication function that complies with a standard protocol.

[0013] Preferably, the communication bus uses a highly reliable RS485 bus for data communication.

[0014] Preferably, the internal power supply is used as a power supply when using a low voltage short-circuit impedance.

[0015] The present invention provides a transformer parameter comprehensive tester, which has the following beneficial effects:

[0016] 1. The transformer parameter comprehensive tester integrates an anti-interference shell, a power socket, a grounding column, a USB interface, an RS232 communication interface, a power switch, an internal and external power conversion switch, a display touch screen, a micro printer, a terminal panel, a Bluetooth communication module, a communication bus and an internal power supply, and integrates a DC resistance tester, a low-voltage short-circuit impedance tester, a load switch tester, a demagnetization and verification demagnetization, and a ratio test in one, so that all test items can be completed by wiring once, the workload of on-site testers is reduced, and the accuracy and reliability of the test are improved. The anti-interference shell and shielding measures effectively reduce the influence of external electromagnetic interference on the test results, and can meet the needs of different occasions and different transformer parameter tests, and have broad application prospects.

[0017] 2. This transformer parameter comprehensive tester facilitates users to connect various external devices and perform wireless data transmission through USB interface, RS232 communication interface and Bluetooth communication module, which improves the flexibility and convenience of the tester.

[0018] 3. This transformer parameter comprehensive tester is provided with a terminal panel, high-voltage side terminals, low-voltage side terminals and a measuring circuit, so that users can conveniently perform wiring operations according to different testing requirements.

[0019] 4. This transformer parameter comprehensive tester effectively eliminates interference between test functions and improves measurement accuracy and stability by adopting the measurement circuit of isolation technology and filtering technology. The communication bus adopts RS485 bus to ensure high reliability of data transmission and accurate transmission of test data.

[0020] 5. This transformer parameter comprehensive tester is provided with an internal power supply, so that when performing low voltage short circuit impedance testing, there is no need to rely on an external power supply, thereby improving the independence and application scope of the tester. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a device module diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the terminal panel of the present invention;

[0023] Figure 3 This is a wiring diagram of a DC resistance test of the present invention;

[0024] Figure 4 This is a schematic diagram of using an internal power supply to test short-circuit impedance of the present invention;

[0025] Figure 5 A schematic diagram of using an external voltage regulator to test short-circuit impedance according to the present invention;

[0026] Figure 6 This is a wiring diagram of a testing single-phase transformer of the present invention;

[0027] Figure 7 This is a wiring diagram of an on-load switch test of the present invention;

[0028] Figure 8 This is a schematic diagram of the degaussing and verification degaussing wiring of the present invention;

[0029] Fig. 9 It is a schematic diagram of the wiring mode of the three-phase transformer with a transformation ratio function of the present invention;

[0030] Fig.10 It is a schematic diagram of the wiring method of a single-phase transformer of the present invention;

[0031] Fig.11 It is a menu interface schematic diagram of the present invention;

[0032] Fig.12 A schematic diagram of the system setting interface of the present invention;

[0033] Fig.13 A schematic diagram of a numeric keyboard of the present invention;

[0034] Fig.14 It is a schematic diagram of the DC resistance test interface of the present invention;

[0035] Fig.15 It is a schematic diagram of the high (medium and low) voltage test interface of the present invention;

[0036] Fig.16 It is a schematic diagram of the high (medium and low) voltage test status bar of the present invention;

[0037] Fig.17 It is a test state schematic diagram of the present invention;

[0038] Fig.18 This is a schematic diagram of the view data button interface of the present invention;

[0039] Fig.19 A schematic diagram of the short-circuit impedance setting interface of the present invention;

[0040] Fig. 20 It is a schematic diagram of the three-phase test interface of the present invention;

[0041] Fig.21 It is a schematic diagram of the printing interface of the present invention;

[0042] Fig. 22 This is a schematic diagram of the data viewing interface of the present invention;

[0043] Fig.23 This is a schematic diagram of the test number interface of the present invention;

[0044] Fig.24 It is a schematic diagram of the interface of the on-load tap changer of the present invention;

[0045] Fig.25 This is a schematic diagram of the startup trigger interface of the present invention;

[0046] Fig.26 It is a schematic diagram of the demagnetization verification interface of the present invention;

[0047] Fig. 27 It is a schematic diagram of the data management interface of the present invention;

[0048] Fig.28 It is a schematic diagram of the ratio test interface of the present invention;

[0049] Fig.29 This is a schematic diagram of the test completion interface of the present invention;

[0050] Fig.30 This is a schematic diagram of the data management test item interface of the present invention;

[0051] Fig.31 This is a schematic diagram of the DC resistance data management interface of the present invention;

[0052] Fig.32 It is a schematic diagram of the short-circuit impedance data management interface of the present invention;

[0053] Fig.33 This is a schematic diagram of the on-load switch data management interface of the present invention;

[0054] Fig.34 It is a schematic diagram of the degaussing data directory interface of the present invention;

[0055] Fig.35 It is a schematic diagram of the data directory of the ratio data demagnetization of the present invention;

[0056] Fig.36 This is a schematic diagram of the test data storage interface of the present invention. DETAILED DESCRIPTION

[0057] Embodiment 1: A transformer parameter comprehensive tester, such as Figure 1-Figure 2 As shown, it includes an anti-interference shell, a power socket, a grounding column, a USB interface, an RS232 communication interface, a power switch, an internal and external power conversion switch, a display touch screen, a micro printer, a terminal panel, a Bluetooth communication module, a communication bus and an internal power supply. The anti-interference shell is designed with shielding measures to improve the anti-interference ability of the whole machine. The power socket has a switch and a safety compartment. The grounding column is used to connect to the ground when the tester is in use. The USB interface is used for an external mouse, a U disk or other USB devices. The RS232 communication interface is used to connect an external printer. The internal and external power conversion switch is used to switch the external power output to the internal power output when using low voltage short-circuit impedance. The power supply is output from the internal power supply, the display touch screen is used to control the instrument status and display various parameters, the micro printer is used to print various test parameters, the terminal panel is used to connect the test lines with different functions, the terminal panel includes high-voltage side terminals, low-voltage side terminals and measurement circuits, the measurement circuit is designed with isolation technology to eliminate the interference between the test functions, the measurement circuit uses both hardware and software filtering technology to improve the anti-interference ability of the measurement function, the Bluetooth communication module has wireless communication function that complies with the standard protocol, the communication bus uses the high-reliability RS485 bus for data communication, and the internal power supply is used for power supply when using low-voltage short-circuit impedance. By integrating the anti-interference shell, power socket, grounding column, USB interface, RS232 communication interface, power switch, internal and external power conversion switch, display touch screen, micro printer, terminal panel, Bluetooth communication module, communication bus and internal power supply, the DC resistance tester, low voltage short circuit impedance tester, load switch tester, demagnetization and verification demagnetization, and ratio test are integrated into one, so that all test items can be completed after one wiring, which reduces the workload of on-site testers and improves the accuracy and reliability of the test. The anti-interference shell and shielding measures can effectively reduce the influence of external electromagnetic interference on the test results. It can meet the needs of different occasions and different transformer parameter tests and has broad application prospects.

[0058] Embodiment 2: Based on Embodiment 1, Figure 3-Figure 10 As shown in the figure, the specific operation process of a transformer parameter comprehensive tester is as follows: the current working environment should be checked before use. After it is proven to be safe, the wiring operation can be carried out. The instrument is connected to the external AC 220V power supply with the power cord, and the grounding terminal is connected to the earth with the grounding wire. When testing a two-winding transformer, the four test clamps connected to the high-voltage terminal are connected to the A, B, C, and O bushings on the high-voltage side at a time. If there are only A, B, and C bushings, the black test clamp is suspended in the air. Connect the four yellow, green, red and black test clamps connected to the low-voltage terminal to the a, b, c and o bushings on the low-voltage side respectively. If there are only three bushings a, b and c, leave the black test clamp suspended. For three-winding transformers, after the high and low voltage winding tests are completed, connect the four high-voltage test clamps to the medium voltage side for testing. For single-phase transformers, connect the yellow and black test clamps of the high-voltage terminal to the high-voltage side of the single-phase transformer, and the yellow and black test clamps of the low-voltage terminal to the low-voltage side of the single-phase transformer. The special test line of the instrument has designed the current and potential lines to the jaws of the same test clamp, and it can be connected. Single-phase transformer: Connect the high-voltage side test line to the transformer bushing and the instrument. Three-phase transformer: If the transformer is demagnetized after the DC resistance experiment, the high-voltage side ab, bc and ca need to be demagnetized respectively. The demagnetization output is not positive or negative. Through the USB interface, RS232 communication interface and Bluetooth communication module, it is convenient for users to connect various external devices and perform wireless data transmission, which improves the flexibility and convenience of the tester. By setting up the terminal panel, high-voltage side terminals, low-voltage side terminals and measurement circuits, users can easily perform wiring operations according to different test requirements. The measurement circuit using isolation technology and filtering technology effectively eliminates interference between test functions and improves measurement accuracy and stability. The communication bus uses RS485 bus to ensure high reliability of data transmission and accurate transmission of test data. By setting up an internal power supply, there is no need to rely on an external power supply when performing low-voltage short-circuit impedance testing, which improves the independence and scope of application of the tester.

[0059] Embodiment 3: Based on Embodiment 1 and Embodiment 2, Figure 11-Figure 36As shown in the figure, the instructions for use of a transformer parameter comprehensive tester are as follows: Turn on the machine: Connect the AC220V power supply to the instrument, connect the transformer bushing and the instrument with the test line, connect the grounding terminal of the instrument to the earth with the grounding wire, connect the power line, turn on the switch, and enter the menu interface. System settings: Touch "System settings" in the instrument test interface to enter the system settings interface, enter the relevant parameters according to the prompts, and touch "Confirm" after the input is completed to return to the instrument option interface. Set the test number: Touch the white rectangular area after the test number, and a numeric keyboard will pop up to set the name of the data storage. Touch the [0~9], [-], [] buttons to freely set the test name. If you want to modify the name, touch [del], the current number will be rolled back, and touch other areas except the numeric keyboard to exit the setting. Set the winding material: Touch the white rectangular area after the winding material to switch the winding material between copper / aluminum. Touch other areas to exit the current setting. Set the test temperature: Touch the white rectangular area after the test temperature, and a numeric keyboard will pop up to enter the temperature value of the tested product; touch the [0~9], [-], [] buttons to freely set the number size. If you want to modify the number, touch [Del], the current number will be rolled back, and touch other areas except the numeric keyboard to exit the current setting. Set the time: Touch the white rectangular area after the test temperature, and a numeric keyboard will pop up to set the instrument clock; touch the [0~9] button to freely set the time. If you want to modify the number, touch [Del], the current number will be rolled back, and touch other areas except the numeric keyboard to exit the current setting. Set the acquisition time: Touch the white rectangular area after the recording time, select the required test time, and touch the option to set to set it. Touch other areas except the numeric keyboard to exit the current setting. DC resistance test: In the instrument test interface, touch "DC resistance" to enter the DC resistance interface. Touch "DC resistance" to enter the DC resistance test interface, and touch "Winding temperature", "Converted temperature" and "Winding material" to set the correct parameters. After that, you can select "High voltage test", "Medium voltage test" and "Low voltage test" in this interface as needed (Note: When performing medium voltage test, please connect the medium voltage test line to the high voltage terminal). After pressing the high (medium and low) voltage test button, the instrument enters the following test interface. In this interface, the status bar will display the current test process in real time. When entering the test interface and the test has not started, the title bar will display the standby state. After starting the test, the status bar will display the charging state during the test current stabilization process. After the current stabilizes, the current current and test resistance value will be displayed in real time, and the status bar will display the testing state. When the stop button is clicked, the status bar will display the discharging state. After the discharge is completed, the status bar will display the discharge completion, and then enter the standby state. In the test interface, you need to select the tap position, test phase, and test current.For the test phase, the options available are A0, B0, C0, AB, BC, CA, ABC. For the split-phase test, the phases available are A0, B0, C0, AB, BC, CA. For the three-phase test, select the ABC phases. At this time, the maximum test current is 10A. For the magnetic assist test, select the AB, BC, CA phases. In the low-voltage test, the magnetic assist button will be automatically displayed. Click the box behind the magnetic assist button. If a check mark appears, it means that the magnetic assist function is successfully selected. For the test current, the options available are 1A, 5A, 10A, and 20A. After selecting the phase and current to be tested, tap "Start" to enter the test state. After the data is stable, you can perform the following operations. Local storage: Click the local storage button to save the current test value. The status bar shows that the storage is successful. When you need to test the DC resistance of other taps, there is no need to stop the discharge. Just adjust the transformer tap position directly. The instrument will automatically measure the resistance value of the current tap. After the data is stable, tap local storage to save the data of the current tap position. U disk storage: Click the U disk storage button to save the current test value to the U disk. Lock: Click the lock button to fix the display of the current test data. Print: Click the print button to print the current tap test data. After the test is completed, click the stop button to stop the test. After the discharge is completed, click the return button to return. View data: Click the view data button to view the test data of all taps. Printing and U disk storage can be performed in this interface. Click the return button to return to the test interface. Short-circuit impedance test: In the instrument test interface, touch "Short-circuit impedance" to enter the short-circuit impedance setting interface. Fill in the relevant parameters according to the prompts. After completion, click single-phase test or three-phase test according to the test item. The single-phase test runs automatically. The three-phase test can select three-phase automatic / three-phase manual. In automatic mode, the short-circuit impedance of AB, BC, and CA phases is measured in turn. In manual mode, the measurement phase needs to be manually selected. After the test is completed, the impedance value and impedance error are automatically calculated. You can connect a printer, touch "Print" to print the current test data, touch "Save" to save the data to the instrument, and touch "Exit" to return to the setting interface. View data: Click the View data button to view the test data of all taps. In this interface, you can select the required test number, and click the return button to return to the test interface. On-load switch test: In the instrument test interface, touch "On-load switch" to enter the on-load switch to be tested interface. Touch "+" or "-" to select the switch tap position, and touch "+" or "-" to adjust the size of the start setting.Tap "Start Test" and you will be prompted to "Confirm" or "Cancel". After confirmation, the instrument starts testing. After the data stabilizes, tap "Start Trigger" to change the position of the transformer on-load tapchanger to measure the switch-related parameters of the on-load tapchanger and analyze the waveform. Tap once at the waveform position to pop up the left cursor, tap "Cursor Switch" to pop up the right cursor, and the cursor can be moved arbitrarily in the waveform. Tap "Left Shift" or "Right Shift" to fine-tune the cursor position. Tap "Average Resistance" to display the average resistance value of the current cursor. Tap "Transition Time" to display the transition time of the left and right cursor segments. Tap "Synchronize" to display the synchronization time between waveforms. Tap "Print" to print the current tested waveform, transition time, transition resistance, and synchronization time. The instrument automatically stores the tested waveform in the instrument. Tap "Exit" to return to the on-load tapchanger test interface. Tap "Start Trigger" to continuously perform on-load tapchangers of other gears. Tap "Stop Test" to stop output and discharge the instrument. Demagnetization and verification Demagnetization: In the instrument test interface, tap "Degauss Verification", click to start the test, and the equipment will demagnetize the test product. The demagnetization time is recorded, and the residual magnetism before and after demagnetization respectively display the residual magnetism percentage of the test product. When the residual magnetism after demagnetization appears, it means that the demagnetization is completed. The data can be saved and printed. The data management interface can view and print the saved historical demagnetization data. Transformation ratio test: In the instrument test interface, tap "Transformation ratio test", single-phase test: After connecting the test line, select single-phase from the three wiring methods below the wiring, enter the rated transformation ratio, if the input is wrong, the transformation ratio error and the current tap position will not be displayed correctly, click the start button, wait for the test results to come out, if you need to pause during the test, please click the stop button, click Exit, and exit the transformation ratio test interface. Three-phase test: After connecting the test line, according to the connection method of the high-voltage side of the three-phase transformer, select three-phase Y or three-phase D from the three wiring methods below the wiring. Enter the rated ratio on the nameplate. If the input is wrong, the ratio error and the current tap position will not be displayed correctly. Click the start button to display the current connection group first, and then the current three-phase ratio value. Wait for the test results to come out. If you need to pause during the test, please click the stop button. Click Exit to exit the ratio test interface. Note: When a wiring error occurs, such as reverse connection of high and low voltage, or short circuit of the primary and secondary sides, the instrument will pop up a warning box. At this time, please check the wiring and perform the above operations after the wiring is correct. Data management and storage: The instrument records test data in the format of time-transformer number. All test data made on the day are stored in files with time as the directory for easy search. Tap "Data Management" to enter the test project interface and select the test project you want to view. Tap the corresponding project to enter the storage directory and select the file you want to view or delete to operate. Tap "DC Resistance" to enter the DC resistance data management, where you can view all saved data or print all saved data at once.Tap "Short-circuit impedance" to enter the short-circuit impedance data management, where you can view all saved data or select the gear to be printed and print the data. Tap "On-load switch" to enter the on-load switch data management, select the waveform you want to view, and tap "Waveform analysis" to open the waveform analysis interface to analyze or print the waveform. In the waveform analysis interface, the zoom in / out button can adjust the waveform horizontally. In manual mode, you can select the corresponding cursor to calculate a certain point. Tap "Degaussing data" to enter the degaussing data directory, select the data you want to view, and view the corresponding experimental results. Tap "Ratio data" to enter the degaussing data directory, select the data you want to view, and view the corresponding experimental results. Insert a USB flash drive, tap "Saved test data", and after it turns into a blue bottom frame, tap "Save to USB flash drive" to prompt that the storage is successful, and the selected data is successfully saved to the USB flash drive. The calculation formula of short-circuit impedance.

[0060] Single-phase transformer: calculated based on the rated capacity of the measuring gear

[0061] Y / △ connection:

[0062] Impedance error: △ZK%=(ZK′%-ZK%)÷ZK′%

[0063] Where:

[0064] I K Is the short-circuit current during the test (A)

[0065] U K is the short-circuit voltage during the test (V)

[0066] U N is the rated voltage (rated line voltage of the gear during the test) (KV)

[0067] Z K % is the percentage of low voltage short circuit impedance

[0068] Z K′ % is the short-circuit impedance percentage on the nameplate or factory report

[0069] Three-phase transformer:

[0070] Y / △, Y / Y connection: calculated based on rated capacity

[0071]

[0072]

[0073]

[0074] Z K % = (Z A %+Z B %+ZC %) / 3

[0075] Impedance error: △ZK%=(ZK′%-ZK%)÷ZK′%

[0076] Where:

[0077] I AB +I BC +I CA Is the short-circuit current during the test (A)

[0078] U AB , U BC , U CA Is the short-circuit voltage during the test (V)

[0079] U N is the rated voltage (gear voltage during the test) (KV)

[0080] S N Rated capacity (KVA)

[0081] Z K % is the percentage of low voltage short circuit impedance

[0082] Z K′ % is the short-circuit impedance percentage on the nameplate or factory report

[0083] △ / Y connection: (short-circuit secondary side a, b, c)

[0084] When AZ-BX-CY is connected: the rated capacity shall prevail.

[0085]

[0086]

[0087]

[0088] When AY-BZ-CX is connected: the rated capacity shall prevail.

[0089]

[0090]

[0091]

[0092] Z K % = (Z A %+Z B %+Z C %) / 3

[0093] Impedance error: △ZK%=(ZK′%-ZK%)÷ZK′%Where:

[0094] I AB +I BC +I CA Is the short-circuit current during the test (A)

[0095] U AB , U BC , U CA is the short-circuit voltage during the test (V)

[0096] U N is the rated voltage (gear voltage during the test) (KV)

[0097] S N Rated capacity (KVA)

[0098] Z K % is the percentage of low voltage short circuit impedance

[0099] Z K′ % is the short-circuit impedance percentage on the nameplate or factory report

[0100] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A transformer parameter comprehensive tester, characterized in that: It includes an anti-interference shell, a power socket, a grounding column, a USB interface, an RS232 communication interface, a power switch, an internal and external power conversion switch, a display touch screen, a micro printer, a terminal panel, a Bluetooth communication module, a communication bus and an internal power supply. The anti-interference shell is designed with shielding measures, and the power socket has its own switch and safety compartment.

2. The transformer parameter comprehensive tester according to claim 1, characterized in that: The terminal panel includes high-voltage side terminals, low-voltage side terminals and a measuring circuit.

3. The transformer parameter comprehensive tester according to claim 1, characterized in that: The Bluetooth communication module has a wireless communication function that complies with the standard protocol.

4. The transformer parameter comprehensive tester according to claim 1, characterized in that: The communication bus adopts the highly reliable RS485 bus for data communication.

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