Wireless distributed winding deformation testing device
The wireless distributed winding deformation testing device solves the problems of signal transmission deviation and low efficiency in transformer winding deformation testing, realizes simultaneous measurement of three phases, and improves the stability and efficiency of the test.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA SOUTHERN POWER GRID GREEN ENERGY TECH (GUANGDONG) CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-05-19
AI Technical Summary
Existing transformer winding deformation testing instruments suffer from problems such as large deviations during signal transmission, low testing efficiency, and difficulty in simultaneously measuring three-phase windings, which affect the safe operation of the power grid.
A wireless distributed winding deformation testing device is adopted, including an excitation module and a response module. It is connected to a remote processing device through a wireless communication module to collect the excitation signal and response signal of each phase winding of the transformer, avoiding interference from external cables and realizing simultaneous measurement of the three phases.
It improves the stability and repeatability of winding characteristic testing, reduces test result deviation, improves testing efficiency and convenience, and realizes an efficient and fast testing process.
Smart Images
Figure CN224262436U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transformer winding detection technology, and in particular to a wireless distributed winding deformation testing device. Background Technology
[0002] Winding deformation is a major hidden danger to the safe operation of power systems. In recent years, with the increase in power system capacity, short-circuit capacity has also increased, and the number of accidents caused by short circuits at the output circuit leading to winding damage has been on the rise.
[0003] Transformer winding deformation poses two main hazards: First, changes in insulation distance or damage to the insulation paper can lead to inter-turn or inter-winding breakdowns under overvoltage conditions, or the insulation damage can gradually expand under prolonged operating voltage, ultimately causing transformer failure. Second, the mechanical properties of the deformed windings decrease, making them unable to withstand the immense impact of a subsequent short circuit and potentially failing immediately. More often, however, they may continue operating for a period before failing. Transformer winding deformation is a significant cause of transformer damage, but conventional electrical tests such as resistance measurement, turns ratio measurement, and capacitance measurement are insufficient to detect it. This seriously threatens the safe operation of the power grid; therefore, it is essential to conduct winding deformation tests and diagnoses on transformers subjected to mechanical and electrodynamic forces.
[0004] Currently, traditional winding deformation testing instruments mainly use the frequency response analysis (FRA) method to measure transformer winding deformation. This method inputs sinusoidal signals of different frequencies to the beginning of the transformer winding, collects the voltage signal at the beginning (input terminal) and the voltage signal at the end (response terminal), calculates the amplitude-frequency response of the voltage signals at both ends, and directly plots the amplitude or phase signal at different frequencies as a function of frequency (frequency response curve). By comparing the data horizontally and vertically, it is determined whether the winding is deformed.
[0005] Conventional winding deformation testers integrate excitation, input, and response terminals. When the excitation terminal generates an excitation signal, the input terminal acquires the excitation voltage signal at the beginning of the winding, and the response terminal acquires the voltage signal at the end of the winding. Because the transformer bushing joints are relatively high above the ground (typically 5-6 meters), the signal cables connecting to the equipment are long. These long cables contain distributed parameters such as inter-line impedance, inductive reactance, and capacitance to ground. These parameters, connected in series with the winding under test, alter the transformer parameters, causing changes during signal transmission. This results in test results that do not accurately reflect the transformer winding characteristics, leading to deviations. Furthermore, such instruments can only test one phase of the winding at a time, while transformers typically have three-phase windings, requiring three separate measurements. It is also difficult to ensure consistent wiring each time the test leads are connected. All these factors affect the test results, resulting in low work efficiency.
[0006] To address this, a wireless distributed winding deformation testing device is proposed. Utility Model Content
[0007] The purpose of this invention is to provide a wireless distributed winding deformation testing device, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.
[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:
[0009] A wireless distributed winding deformation testing device includes an excitation module, a response module, and a remote processing device. The excitation module is connected to the winding end of the transformer under test. Three response modules are provided, each corresponding to one of the A-phase, B-phase, and C-phase winding ends of the transformer under test. The excitation module injects an excitation signal into the winding of the transformer under test and simultaneously acquires the excitation signal at the winding end. The three response modules acquire the response signals of their respective phase windings. The excitation module is connected to the remote processing device via a first wireless communication module, and the response modules are connected to the remote processing device via a second wireless communication module.
[0010] In the wireless distributed winding deformation testing device according to the present invention, the excitation module includes a first main control chip, a first FPGA chip, an excitation signal generation unit, and a first signal acquisition unit. The first main control chip is electrically connected to the first FPGA chip via an FMSC bus and is electrically connected to the first wireless communication module. The first FPGA chip is electrically connected to both the excitation signal generation unit and the first signal acquisition unit. The excitation signal generation unit is used to generate and output an excitation signal to the transformer winding under test, and the first signal acquisition unit is used to acquire the excitation signal and transmit it to the first FPGA chip.
[0011] In the wireless distributed winding deformation testing device according to this utility model, the excitation signal generating unit includes a DDS module, a first high-speed DAC module, a waveform adjustment unit, a drive amplifier, and a 50Ω output impedance. The DDS module is integrated inside the first FPGA chip. The output terminal of the DDS module is electrically connected to the input terminal of the waveform adjustment unit through the first high-speed DAC module. The output terminal of the waveform adjustment unit is electrically connected to the input terminal of the 50Ω output impedance through the drive amplifier. The output terminal of the 50Ω output impedance outputs an excitation signal and is connected to the end of the winding of the transformer under test.
[0012] In the wireless distributed winding deformation testing device according to the present invention, the first signal acquisition unit includes a voltage divider network, a buffer, a low-pass filter, and a first high-precision ADC module. The input terminal of the voltage divider network is electrically connected to the output terminal with a 50Ω output impedance. The output terminal of the voltage divider network is electrically connected to the input terminal of the first high-precision ADC module after passing through the buffer and the low-pass filter in sequence. The output terminal of the first high-precision ADC module is electrically connected to the first FPGA chip.
[0013] In the wireless distributed winding deformation testing device according to the present invention, each of the response modules includes a second main control chip, a second FPGA chip, and a second signal acquisition unit. The second FPGA chip is electrically connected to the second signal acquisition unit. The first main control chip is electrically connected to the second FPGA chip via an FMSC bus. The second main control chip is electrically connected to the second wireless communication module.
[0014] In the wireless distributed winding deformation testing device according to this utility model, the second signal acquisition unit includes a second high-precision ADC module, a programmable amplifier circuit, a programmable filter circuit, and a 50Ω input impedance. The input terminal of the 50Ω input impedance is connected to the first end of the corresponding phase winding. The 50Ω input impedance is electrically connected to the second high-precision ADC module through the programmable amplifier circuit and the programmable filter circuit. The output terminal of the second high-precision ADC module is electrically connected to the second FPGA chip. The amplifier multiplexer and filter multiplexer in the programmable amplifier circuit and the programmable filter circuit are controlled by the second main control chip.
[0015] In the wireless distributed winding deformation testing device according to the present invention, both the first FPGA chip and the second FPGA chip are externally connected to a 25M crystal oscillator, and both the first main control chip and the second main control chip adopt an STM32F103 microprocessor.
[0016] In the wireless distributed winding deformation testing device according to the present invention, both the first wireless communication module and the second wireless communication module are either 5G communication modules or WiFi communication modules.
[0017] The wireless distributed winding deformation testing device according to this utility model further includes a housing. The excitation module and the response module are respectively installed in the corresponding housings. A wireless communication antenna and a signal acquisition fixture are installed on the housing. The signal acquisition fixture on the housing where the excitation module is installed is electrically connected to the output terminal of a 50Ω output impedance. The signal acquisition fixture on the housing where the response module is installed is electrically connected to the input terminal of a 50Ω input impedance. The wireless communication antenna on the housing where the excitation module is installed is electrically connected to a first wireless communication module. The wireless communication antenna on the housing where the response module is installed is electrically connected to a second wireless communication module.
[0018] In the wireless distributed winding deformation testing device according to the present invention, a grounding coaxial cable for grounding is also installed on the housing, and the excitation module and the response module are grounded through the housing of the transformer under test.
[0019] This utility model has at least the following beneficial effects:
[0020] Wireless data transmission and reception are achieved through the wireless transmission modules of the excitation and response modules, completely avoiding interference introduced by external cables. This ensures that the collected excitation and response signals can truly reflect the characteristics of the transformer windings, improves the stability and repeatability of winding fingerprint spectrum detection, and reduces the deviation of test results.
[0021] This device is equipped with three response modules, corresponding to the starting ends of the A-phase, B-phase, and C-phase windings respectively, and can collect three-phase data simultaneously. Moreover, it only requires one high-altitude installation of the excitation module and response module, without the need for phase switching in the middle, which greatly reduces the testing time, improves the convenience of on-site testing, and realizes an efficient and fast testing process. Attached Figure Description
[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0023] Figure 1 This is a circuit block diagram of the excitation module of this utility model;
[0024] Figure 2 This is a circuit block diagram of the response module of this utility model;
[0025] Figure 3 This is a front view structural diagram of the shell of this utility model;
[0026] Figure 4 This is a side view of the housing structure of this utility model.
[0027] Explanation of icon numbers:
[0028] 1. Excitation module; 101. First main control chip; 102. First FPGA chip; 103. First high-speed DAC module; 104. Waveform adjustment unit; 105. Driver amplifier; 106. 50Ω output impedance; 107. Voltage divider network; 108. Buffer; 109. Low-pass filter; 110. First high-precision ADC module; 111. First wireless communication module;
[0029] 2. Response module; 201. Second main control chip; 202. Second FPGA chip; 203. Second high-precision ADC module; 204. Programmable amplifier circuit and programmable filter circuit; 205. 50Ω input impedance; 206. Second wireless communication module;
[0030] 3. Housing; 301. Grounding coaxial cable; 302. Wireless communication antenna; 303. Signal acquisition clamp. Detailed Implementation
[0031] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.
[0032] Please refer to Figures 1 to 4 As shown, an embodiment of this utility model provides a wireless distributed winding deformation testing device, including an excitation module 1, a response module 2, and a remote processing device. The excitation module 1 is connected to the winding end of the transformer under test. Three response modules 2 are provided, and the three response modules 2 are respectively connected to the starting ends of the A-phase, B-phase, and C-phase windings of the transformer under test. The excitation module 1 is used to inject an excitation signal into the winding of the transformer under test and simultaneously collect the excitation signal at the winding end of the transformer under test. The three response modules 2 are used to collect the response signals of the corresponding phase windings. The excitation module 1 is connected to the remote processing device via a first wireless communication module 111, and the response modules 2 are connected to the remote processing device via a second wireless communication module 206.
[0033] Working principle: Excitation module 1 injects an excitation signal into the end of the winding of the transformer under test and simultaneously collects the excitation signal at that end; three response modules 2 collect the response signals at the beginning of the A-phase, B-phase, and C-phase windings of the transformer under test, respectively; excitation module 1 transmits the collected signals to the remote processing device through the first wireless communication module 111 and response module 2 through the second wireless communication module 206, realizing wireless distributed data acquisition and processing without the need for external cables, thus avoiding interference introduced by cables.
[0034] Specifically, in this embodiment, the excitation module 1 includes a first main control chip 101, a first FPGA chip 102, an excitation signal generation unit, and a first signal acquisition unit. The first main control chip 101 is electrically connected to the first FPGA chip 102 via an FMSC bus. The first main control chip 101 is also electrically connected to the first wireless communication module 111. The first FPGA chip 102 is electrically connected to both the excitation signal generation unit and the first signal acquisition unit. The excitation signal generation unit generates and outputs an excitation signal to the winding of the transformer under test. The first signal acquisition unit acquires the excitation signal and transmits it to the first FPGA chip 102.
[0035] The first main control chip 101 interacts with the first FPGA chip 102 via the FMSC bus. The first FPGA chip 102 controls the excitation signal generation unit to generate an excitation signal and outputs it to the winding of the transformer under test. At the same time, it controls the first signal acquisition unit to acquire the excitation signal. The acquired signal is transmitted to the first FPGA chip 102 for processing and then transmitted by the first main control chip 101 to the remote processing device through the first wireless communication module 111, thereby realizing the generation, acquisition and transmission control of the excitation signal.
[0036] Specifically, in this embodiment, the excitation signal generation unit includes a DDS module, a first high-speed DAC module 103, a waveform adjustment unit 104, a drive amplifier 105, and a 50Ω output impedance 106. The DDS module is integrated inside the first FPGA chip 102. The output terminal of the DDS module is electrically connected to the input terminal of the waveform adjustment unit 104 through the first high-speed DAC module 103. The output terminal of the waveform adjustment unit 104 is electrically connected to the input terminal of the 50Ω output impedance 106 through the drive amplifier 105. The output terminal of the 50Ω output impedance 106 outputs an excitation signal and is connected to the end of the winding of the transformer under test.
[0037] The DDS module integrated in the first FPGA chip 102 generates a digital excitation signal, which is converted from digital to analog signal by the first high-speed DAC module 103. After the analog signal is shaped and optimized by the waveform adjustment unit 104, it is amplified by the drive amplifier 105 and then stably output to the end of the winding of the transformer under test through the 50Ω output impedance 106, ensuring that the excitation signal meets the test requirements.
[0038] Specifically, in this embodiment, the first signal acquisition unit includes a voltage divider network 107, a buffer 108, a low-pass filter 109, and a first high-precision ADC module 110. The input terminal of the voltage divider network 107 is electrically connected to the output terminal of the 50Ω output impedance 106. The output terminal of the voltage divider network 107 is electrically connected to the input terminal of the first high-precision ADC module 110 after passing through the buffer 108 and the low-pass filter 109 in sequence. The output terminal of the first high-precision ADC module 110 is electrically connected to the first FPGA chip 102.
[0039] The excitation signal output by the 50Ω output impedance 106 is divided to a suitable range by the voltage divider network 107, isolated and buffered by the buffer 108, and then filtered out high-frequency noise by the low-pass filter 109. The processed signal is converted from analog to digital by the first high-precision ADC module 110, and the converted digital signal is transmitted to the first FPGA chip 102 to realize the accurate acquisition of the excitation signal.
[0040] Specifically, in this embodiment, each response module 2 includes a second main control chip 201, a second FPGA chip 202, and a second signal acquisition unit. The second FPGA chip 202 is electrically connected to the second signal acquisition unit. The first main control chip 101 is electrically connected to the second FPGA chip 202 via the FMSC bus. The second main control chip 201 is electrically connected to the second wireless communication module 206.
[0041] The second signal acquisition unit acquires the response signal of the corresponding phase winding and transmits it to the second FPGA chip 202; the first main control chip 101 performs synchronous control and data interaction with the second FPGA chip 202 through the FMSC bus; the second main control chip 201 transmits the response signal processed by the second FPGA chip 202 to the remote processing device through the second wireless communication module 206, thereby realizing the acquisition and transmission of the response signal.
[0042] Specifically, in this embodiment, the second signal acquisition unit includes a second high-precision ADC module 203, a programmable amplifier circuit and a programmable filter circuit 204, and a 50Ω input impedance 205. The input terminal of the 50Ω input impedance 205 is connected to the first end of the corresponding phase winding. The 50Ω input impedance 205 is electrically connected to the second high-precision ADC module 203 through the programmable amplifier circuit and the programmable filter circuit 204. The output terminal of the second high-precision ADC module 203 is electrically connected to the second FPGA chip 202. The amplifier multiplexer and filter multiplexer in the programmable amplifier circuit and the programmable filter circuit 204 are controlled by the second main control chip 201.
[0043] The response signal at the beginning of the corresponding phase winding is input through a 50Ω input impedance 205. The second main control chip 201 controls the amplifier multiplexer and filter multiplexer in the programmable amplifier circuit and programmable filter circuit 204 to realize automatic range adjustment and filtering of the signal. The processed signal is converted from analog to digital by the second high-precision ADC module 203. The converted digital signal is transmitted to the second FPGA chip 202 to realize accurate acquisition and processing of the response signal.
[0044] In this embodiment, both the first FPGA chip 102 and the second FPGA chip 202 are connected to an external 25M crystal oscillator, and both the first main control chip 101 and the second main control chip 201 use an STM32F103 microprocessor.
[0045] The 25MHz crystal oscillator provides a stable clock signal for the first FPGA chip 102 and the second FPGA chip 202, ensuring the timing accuracy of digital signal generation and acquisition. The first main control chip 101 and the second main control chip 201 use STM32F103 microprocessors, which are responsible for data processing, module control and wireless communication coordination, ensuring the overall stability and efficiency of the device.
[0046] In this embodiment, both the first wireless communication module 111 and the second wireless communication module 206 adopt 5G communication modules or WiFi communication modules.
[0047] The first wireless communication module 111 and the second wireless communication module 206 adopt 5G or WiFi modules to realize wireless data transmission between the excitation module 1, the response module 2 and the remote processing device, avoiding the interference of distributed parameters such as line impedance, inductive reactance and ground capacitance introduced by traditional cables on the test signal, and improving the stability of data transmission.
[0048] In this embodiment, a housing 3 is also provided. The excitation module 1 and the response module 2 are respectively installed in the corresponding housing 3. A wireless communication antenna 302 and a signal acquisition fixture 303 are installed on the housing 3. The signal acquisition fixture 303 on the housing 3 where the excitation module 1 is installed is electrically connected to the output terminal of the 50Ω output impedance 106. The signal acquisition fixture 303 on the housing 3 where the response module 2 is installed is electrically connected to the input terminal of the 50Ω input impedance 205. The wireless communication antenna 302 on the housing 3 where the excitation module 1 is installed is electrically connected to the first wireless communication module 111. The wireless communication antenna 302 on the housing 3 where the response module 2 is installed is electrically connected to the second wireless communication module 206.
[0049] The housing 3 protects the excitation module 1 and the response module 2. The signal acquisition fixture 303, which is electrically connected to the excitation module 1, connects the excitation signal output from the 50Ω output impedance 106 to the end of the transformer winding under test. The signal acquisition fixture 303, which is electrically connected to the response module 2, connects the response signal from the beginning of the corresponding phase winding to the 50Ω input impedance 205. The wireless communication antenna 302 enhances the wireless signal strength of the first wireless communication module 111 and the second wireless communication module 206 to ensure stable data transmission.
[0050] Furthermore, in this embodiment, a grounding coaxial cable 301 for grounding is also installed on the housing 3, and the excitation module 1 and the response module 2 are grounded through the housing of the transformer under test.
[0051] The grounding coaxial cable 301 grounds the housing 3. The excitation module 1 and the response module 2 share a common ground through the housing of the transformer under test, ensuring that each module has a unified reference ground potential, reducing the impact of grounding interference on signal acquisition and transmission, and improving test accuracy.
[0052] Working principle:
[0053] I. Preparations before the test
[0054] 1. Equipment Inspection
[0055] Check the hardware integrity of excitation module 1 and the three response modules 2: confirm that the wireless communication antenna 302, signal acquisition fixture 303 and grounding coaxial cable 301 on the housing 3 are firmly connected; check whether the first wireless communication module 111 and the second wireless communication module 206 are powered normally.
[0056] II. Module Installation and Connection
[0057] The excitation module 1 is connected to the winding end of the transformer under test via the signal acquisition clamp 303 on its housing 3 to ensure reliable contact;
[0058] The three response modules 2 are respectively connected to the first ends of the A-phase, B-phase, and C-phase windings of the transformer under test through the signal acquisition clamps 303 on their respective housings 3;
[0059] The excitation module 1 and all response modules 2 are grounded via the grounded coaxial cable 301 on the housing 3, and a common ground is achieved through the housing of the transformer under test, ensuring that the reference ground potential of each module is consistent. III. Wireless Connection and Parameter Configuration
[0060] 1. Establishing wireless communication
[0061] The wireless communication functions of the activation module 1 and the response module 2 are activated: the first wireless communication module 111 and the second wireless communication module 206 establish wireless connections with the remote processing device through the wireless communication antenna 302, and the software of the remote processing device displays the connection status of each module (such as "Device 1 / 2 / 3 / 4 are connected").
[0062] 2. Parameter Settings
[0063] Configure the software interface on the remote processing device:
[0064] Communication settings: Select the corresponding serial port and confirm the device connection status;
[0065] Parameter settings: Enter the field wiring method (e.g., "O-end input, A-end measurement"), sweep start frequency (e.g., 1kHz), end frequency (e.g., 2000kHz), average number of times, silence time (e.g., 100ms), and data upload time slice (e.g., 10ms). Click "Download Parameters" to send the configuration to the excitation module and response module.
[0066] IV. Startup Test and Signal Acquisition
[0067] 1. Excitation signal generation and injection
[0068] After the remote processing device issues the "start test" command, excitation module 1 starts working:
[0069] The DDS module inside the first FPGA chip 102 generates a 12-bit digital excitation signal, which is converted from digital to analog by the first high-speed DAC module 103 and outputs a 12MHz sine wave analog signal.
[0070] The analog signal is shaped by the waveform adjustment unit 104 and amplified by the drive amplifier 105, and then stably injected into the end of the winding of the transformer under test through the 50Ω output impedance 106 and the signal acquisition fixture 303.
[0071] 2. Excitation signal acquisition
[0072] The first signal acquisition unit of excitation module 1 synchronously acquires the end excitation signal:
[0073] The signal output by the 50Ω output impedance 106 is divided to a suitable range by the voltage divider network 107, and is isolated by the buffer 108 and filtered out by the low-pass filter 109;
[0074] The processed signal is converted into a 16-bit analog-to-digital converter by the first high-precision ADC module 110, and the converted data is temporarily stored in the FIFO buffer of the first FPGA chip 102.
[0075] 3. Response signal acquisition
[0076] The three response modules 2 synchronously acquire the response signals from the start of the corresponding phase windings:
[0077] After the response signal is input through the 50Ω input impedance 205, the second main control chip 201 controls the amplifier multiplexer and filter multiplexer in the programmable amplifier circuit and programmable filter circuit 204 to realize automatic range adjustment and filtering of the signal.
[0078] The processed signal is converted into a 16-bit analog-to-digital signal by the second high-precision ADC module 203, and the converted data is transmitted to the second FPGA chip 202.
[0079] V. Data Transmission and Analysis
[0080] 1. Wireless data transmission
[0081] In excitation module 1, the first main control chip 101 reads the excitation signal data cached by the first FPGA chip 102 through the FMSC bus and transmits it to the remote processing device through the first wireless communication module 111;
[0082] In response module 2, the second main control chip 201 reads the response signal data of the second FPGA chip 202 and transmits it to the remote processing device via the second wireless communication module 206;
[0083] The first main control chip 101 interacts with the second FPGA chip 202 via the FMSC bus to ensure that the acquisition timing of the excitation signal and the response signal is synchronized.
[0084] 2. Data Processing and Map Generation
[0085] The remote processing equipment software performs amplitude-frequency response calculations on the received excitation and response signals, draws fingerprint maps (frequency response curves) of the A-phase, B-phase, and C-phase windings, and determines whether the windings have deformed through horizontal (three-phase) and vertical (historical data) comparison and analysis.
[0086] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.
Claims
1. A wireless distributed winding deformation testing device, characterized in that, It includes an excitation module (1), a response module (2), and a remote processing device; the excitation module (1) is connected to the winding end of the transformer under test, and three response modules (2) are provided, each of which is connected to the starting end of the A-phase, B-phase, and C-phase windings of the transformer under test respectively; the excitation module (1) is used to inject an excitation signal into the winding of the transformer under test and simultaneously collect the excitation signal at the winding end of the transformer under test, and the three response modules (2) are used to collect the response signal of the corresponding phase winding respectively, the excitation module (1) is connected to the remote processing device through a first wireless communication module (111), and the response module (2) is connected to the remote processing device through a second wireless communication module (206).
2. The wireless distributed winding deformation testing device according to claim 1, characterized in that: The excitation module (1) includes a first main control chip (101), a first FPGA chip (102), an excitation signal generation unit, and a first signal acquisition unit. The first main control chip (101) is electrically connected to the first FPGA chip (102) via an FMSC bus. The first main control chip (101) is electrically connected to the first wireless communication module (111). The first FPGA chip (102) is electrically connected to the excitation signal generation unit and the first signal acquisition unit, respectively. The excitation signal generation unit is used to generate and output an excitation signal to the winding of the transformer under test. The first signal acquisition unit is used to acquire the excitation signal and transmit it to the first FPGA chip (102).
3. The wireless distributed winding deformation testing device according to claim 2, characterized in that: The excitation signal generation unit includes a DDS module, a first high-speed DAC module (103), a waveform adjustment unit (104), a driver amplifier (105), and a 50Ω output impedance (106). The DDS module is integrated inside the first FPGA chip (102). The output terminal of the DDS module is electrically connected to the input terminal of the waveform adjustment unit (104) through the first high-speed DAC module (103). The output terminal of the waveform adjustment unit (104) is electrically connected to the input terminal of the 50Ω output impedance (106) through the driver amplifier (105). The output terminal of the 50Ω output impedance (106) outputs an excitation signal and is connected to the end of the winding of the transformer under test.
4. The wireless distributed winding deformation testing device according to claim 3, characterized in that: The first signal acquisition unit includes a voltage divider network (107), a buffer (108), a low-pass filter (109), and a first high-precision ADC module (110). The input terminal of the voltage divider network (107) is electrically connected to the output terminal of a 50Ω output impedance (106). The output terminal of the voltage divider network (107) is electrically connected to the input terminal of the first high-precision ADC module (110) after passing through the buffer (108) and the low-pass filter (109) in sequence. The output terminal of the first high-precision ADC module (110) is electrically connected to the first FPGA chip (102).
5. The wireless distributed winding deformation testing device according to claim 4, characterized in that: Each of the response modules (2) includes a second main control chip (201), a second FPGA chip (202), and a second signal acquisition unit. The second FPGA chip (202) is electrically connected to the second signal acquisition unit. The first main control chip (101) is electrically connected to the second FPGA chip (202) via an FMSC bus. The second main control chip (201) is electrically connected to the second wireless communication module (206).
6. The wireless distributed winding deformation testing device according to claim 5, characterized in that: The second signal acquisition unit includes a second high-precision ADC module (203), a programmable amplifier circuit and a programmable filter circuit (204), and a 50Ω input impedance (205). The input terminal of the 50Ω input impedance (205) is connected to the first end of the corresponding phase winding. The 50Ω input impedance (205) is electrically connected to the second high-precision ADC module (203) through the programmable amplifier circuit and the programmable filter circuit (204). The output terminal of the second high-precision ADC module (203) is electrically connected to the second FPGA chip (202). The amplifier multiplexer and filter multiplexer in the programmable amplifier circuit and the programmable filter circuit (204) are controlled by the second main control chip (201).
7. The wireless distributed winding deformation testing device according to claim 5, characterized in that: Both the first FPGA chip (102) and the second FPGA chip (202) are connected to an external 25M crystal oscillator, and both the first main control chip (101) and the second main control chip (201) use an STM32F103 microprocessor.
8. The wireless distributed winding deformation testing device according to claim 1, characterized in that: Both the first wireless communication module (111) and the second wireless communication module (206) adopt 5G communication modules or WiFi communication modules.
9. The wireless distributed winding deformation testing device according to claim 6, characterized in that: It also includes a housing (3), in which the excitation module (1) and the response module (2) are respectively installed. A wireless communication antenna (302) and a signal acquisition fixture (303) are installed on the housing (3). The signal acquisition fixture (303) on the housing (3) where the excitation module (1) is installed is electrically connected to the output terminal of a 50Ω output impedance (106). The signal acquisition fixture (303) on the housing (3) where the response module (2) is installed is electrically connected to the input terminal of a 50Ω input impedance (205). The wireless communication antenna (302) on the housing (3) where the excitation module (1) is installed is electrically connected to a first wireless communication module (111). The wireless communication antenna (302) on the housing (3) where the response module (2) is installed is electrically connected to a second wireless communication module (206).
10. The wireless distributed winding deformation testing device according to claim 9, characterized in that: The housing (3) is also equipped with a grounding coaxial cable (301) for grounding, and the excitation module (1) and the response module (2) are grounded through the housing of the transformer under test.