A wireless transformer winding deformation detection device
The wireless transformer winding deformation detection device, which utilizes wireless communication and a high-impedance design, solves the problems of signal distortion and multiple wiring in traditional detection equipment, achieving efficient and accurate transformer winding condition detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HARBIN WUGE ELECTRONIC TECH CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-05-29
AI Technical Summary
Traditional transformer winding deformation detection equipment relies on long-distance cable connections, which leads to signal distortion and multiple wiring operations, affecting measurement accuracy and efficiency.
A wireless communication module is used to realize data transmission between the excitation and response ends. Combined with high impedance design and filtering circuit, signal stability is ensured. The three-phase winding generates a sine wave signal through the DDS chip and uploads the data synchronously, simplifying the wiring process.
It completely eliminates the influence of cable parameters on measurement results, realizes synchronous acquisition and efficient detection of three-phase data, and improves the portability and battery life of the testing equipment.
Smart Images
Figure CN224303836U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of transformer winding deformation detection, and in particular relates to a wireless transformer winding deformation detection device. Background Technology
[0002] As a core component of the power system, the accurate detection of the mechanical condition of transformer windings is crucial for ensuring power grid security. Traditional winding deformation detection equipment uses a wired connection scheme, with the excitation, input, and response ends connected to the transformer bushing joints via physical cables. Since transformers are typically installed at overhead heights of 4 to 10 meters, the cable length needs to be correspondingly extended. However, the inherent parasitic parameters of long-distance cables, such as inter-line impedance, inductive reactance, and capacitance to ground, are directly connected in series with the tested winding circuit, causing a deviation in the actual electrical parameters applied to the winding. This parameter coupling effect distorts the signal during transmission, severely affecting the accuracy of frequency response analysis results and potentially masking true winding deformation faults or leading to misjudgments.
[0003] Furthermore, existing equipment, due to structural limitations, only supports single-phase sequential measurements. For conventional A / B / C three-phase transformers, operators must repeat the process of connecting cables and changing the test phase three times. This significantly increases the workload on-site (the testing time for a single transformer often exceeds 30 minutes), and multiple wiring operations may introduce differences in contact resistance, making it difficult to guarantee the consistency of three-phase data. More importantly, test cables in complex electromagnetic environments can couple with on-site interference noise, further reducing the measurement signal-to-noise ratio.
[0004] The industry has long faced two major technical contradictions: First, to reduce the impact of cables, their length needs to be shortened, but high-altitude operation of transformers forces cables to be extended; second, efficiency improvement requires simultaneous measurement of multiple phases, but wired connection solutions cannot achieve synchronous data acquisition under physical isolation. Utility Model Content
[0005] In view of this, the present invention aims to propose a wireless transformer winding deformation detection device to solve the problems of cable extension caused by high-altitude transformer operations and the inability of wired connection schemes to achieve synchronous data acquisition under physical isolation.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A wireless transformer winding deformation detection device includes an excitation end and multiple response ends. The excitation end and response ends transmit data via a wireless communication module. The excitation end includes an excitation signal generation circuit, an excitation output end, and an excitation end main control chip. The response end includes a signal acquisition circuit, a response input end, and a response end main control chip. The excitation output end converts a digital signal into an analog signal to excite an external transformer winding via the excitation signal generation circuit. The signal at the excitation end input end is connected to the first end of the external winding to acquire an analog signal. The analog signal is converted into a digital signal by a high-speed 14-bit ADC conversion chip, and the digital signal is transmitted to the excitation end main control chip via a high-speed FSMC bus. The excitation end main control chip transmits the acquired analog signal to the transformer winding via the wireless communication module as the transformer winding input voltage. The response end converts the analog signal into a digital signal based on the impedance of the external winding via the signal acquisition circuit. The response end main control chip uploads the analog signal acquired by the signal acquisition circuit to a host computer via the wireless communication module as the response end voltage.
[0008] Furthermore, a preferred embodiment is proposed, wherein the excitation signal generation circuit includes a DDS chip and a drive amplifier; the DDS chip is connected to an external crystal oscillator, and the DDS chip converts the digital signal output by the excitation terminal main control chip into an analog signal, which is then amplified by the drive amplifier and enters the excitation output terminal.
[0009] Furthermore, a preferred embodiment is proposed in which the excitation output terminal is a BNC connector and configured with a 50Ω output impedance.
[0010] Furthermore, a preferred embodiment is proposed, wherein the signal acquisition circuit includes a programmable amplifier, a filter circuit, and an ADC conversion chip; the input terminal of the programmable amplifier is connected to the excitation output terminal, the excitation output terminal is connected to the ADC conversion chip via the filter circuit, and the ADC conversion chip converts the analog signal into a digital signal and transmits it to the main control chip at the response terminal.
[0011] Furthermore, a preferred embodiment is proposed in which the response input terminal is a BNC connector and configured with a 1MΩ input impedance and a voltage follower circuit.
[0012] Furthermore, a preferred embodiment is proposed, wherein both the excitation end main control chip and the response end main control chip are 32-bit STM32H743 microprocessors, and are connected to the wireless communication module via an SPI bus. The wireless communication module is a 2.4G wireless module, and each module has a unique address code.
[0013] Furthermore, a preferred embodiment is proposed in which the detection device further includes a power management unit, which includes a lithium battery, a switching power supply chip, and a Type-C charging interface; the switching power supply chip converts the 12V power supply of the lithium battery into multiple system voltage sources.
[0014] Furthermore, a preferred embodiment is proposed, wherein the detection device further includes a housing and a front panel, the excitation signal generation circuit, the excitation end main control chip, the signal acquisition circuit, and the response end main control chip are fixed inside the housing, the panel is used to enclose the housing, the excitation output end and the response input end are located outside the panel, the front panel is provided with a display screen, a power switch, a wiring display area and a charging status indicator; the panel is also provided with a grounding terminal.
[0015] Furthermore, a preferred embodiment is proposed in which the display screen is used to display the device address, connection status, and remaining battery power.
[0016] Furthermore, a preferred embodiment is proposed, wherein the number of excitation terminals is one, and the number of response terminals is three, corresponding to the A-phase, B-phase, and C-phase windings of the transformer, respectively, and the programmable amplifier of each response terminal switches the amplification factor according to the winding impedance.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] Traditional testing equipment relies on long-distance cables connecting transformer bushings (typically 4-10 meters high). The inherent distributed capacitance, series inductance, and impedance to ground of these cables are superimposed on the tested winding circuit, causing signal transmission distortion. The wireless transformer winding deformation detection device proposed in this invention adopts a distributed wireless transmission structure. Both the excitation and response ends integrate independent wireless communication modules (2.4GHz band), exchanging data with the main control chip via an SPI bus, completely eliminating physical cables. The response end's input impedance circuit uses a 1MΩ high impedance design, combined with a two-stage filtering circuit to suppress environmental noise. The excitation end's output end is equipped with a 50Ω impedance matching circuit to ensure signal drive stability.
[0019] This design physically prevents the cable parameters from affecting the measurement results.
[0020] Traditional equipment requires three separate wiring operations to measure the three-phase windings, which can easily introduce differences in contact resistance. This invention proposes a wireless transformer winding deformation detection device that achieves a breakthrough through a discrete response-end hardware structure. The A, B, and C phase response ends are independently equipped with programmable amplifier circuits and analog-to-digital converter circuits, which can automatically switch the amplification factor according to the impedance of each phase winding. The excitation end generates a 1k-2MHz sine wave signal through a DDS chip (with an external 25MHz crystal oscillator), which is amplified and simultaneously excites the three-phase windings. The three-phase response data is synchronously uploaded through a wireless module with a unique address code, ensuring strict alignment of data timestamps. A single connection completes the three-phase data acquisition, avoiding contact errors caused by multiple wiring operations, and ensuring that the lateral comparison results accurately reflect the differences in winding condition.
[0021] Addressing the complex environment of transformer field testing, this invention proposes a wireless transformer winding deformation detection device. Through integrated hardware design, it enhances portability and battery life. The battery management unit utilizes a high-efficiency switching power supply chip, supports Type-C fast charging, and can operate continuously for over 8 hours on a 12V lithium battery. The clamp and grounding wire structure are directly grounded to the transformer shell / core clamp via BNC connectors, simplifying the grounding process. The BNC connectors on the excitation and response ends support multiple wiring methods, including YN and Y types. The wireless communication module supports multi-device networking and can be expanded to more phase windings or parallel transformer testing scenarios.
[0022] The wireless transformer winding deformation detection device proposed in this invention is applied to the field of power system testing. Attached Figure Description
[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0024] Figure 1 This is a circuit diagram of a wireless transformer winding deformation detection device according to the present invention.
[0025] Figure 2 This is a schematic diagram of the structure of a wireless transformer winding deformation detection device according to the present invention;
[0026] Figure 3 This is a schematic diagram of the back of a wireless transformer winding deformation detection device according to the present invention;
[0027] Figure 4 This is a schematic diagram of the internal circuit board of a wireless transformer winding deformation detection device according to the present invention.
[0028] Figure 5This is a schematic diagram of the internal structure of a wireless transformer winding deformation detection device according to the present invention.
[0029] In the picture:
[0030] 1-Excitation output terminal, 2-Ground wire, 3-Clamp, 4-Type-C charging interface, 5-Battery compartment, 6-Circuit board, 7-Lithium battery. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.
[0032] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] Implementation Method 1: This implementation method describes a wireless transformer winding deformation detection device. The detection device includes an excitation end and multiple response ends. The excitation end and response ends transmit data via a wireless communication module. The excitation end includes an excitation signal generation circuit, an excitation output end, and an excitation end main control chip. The response end includes a signal acquisition circuit, a response input end, and a response end main control chip. The excitation output end converts a digital signal into an analog signal to excite the external transformer winding through the excitation signal generation circuit. The signal at the excitation end input end is connected to the first end of the external winding to acquire an analog signal. The analog signal is converted into a digital signal by a high-speed 14-bit ADC conversion chip. The digital signal is transmitted to the excitation end main control chip via a high-speed FSMC bus. The excitation end main control chip transmits the acquired analog signal to the transformer winding as the transformer winding input voltage through the wireless communication module. The response end converts the analog signal into a digital signal through the signal acquisition circuit according to the impedance of the external winding. The response end main control chip uploads the analog signal acquired by the signal acquisition circuit to the host computer through the wireless communication module as the response end voltage.
[0035] Traditional testing equipment relies on long-distance cables connecting transformer bushings (typically 4-10 meters high). The inherent distributed capacitance, series inductance, and impedance to ground of these cables are superimposed on the tested winding circuit, causing signal transmission distortion. The wireless transformer winding deformation detection device proposed in this embodiment adopts a distributed wireless transmission structure. Both the excitation and response ends integrate independent wireless communication modules (2.4GHz band), exchanging data with the main control chip via an SPI bus, completely eliminating physical cables. The response end's input impedance circuit uses a 1MΩ high impedance design, combined with a two-stage filtering circuit to suppress environmental noise. The excitation end's output end is equipped with a 50Ω impedance matching circuit to ensure signal drive stability.
[0036] This design physically prevents the cable parameters from affecting the measurement results.
[0037] Traditional equipment requires three separate wiring operations to measure the three-phase windings, which can easily introduce differences in contact resistance. The wireless transformer winding deformation detection device proposed in this embodiment achieves a breakthrough through a discrete response-end hardware structure. The A, B, and C phase response ends are independently configured with programmable amplifier circuits and analog-to-digital converter circuits, which can automatically switch the amplification factor according to the impedance of each phase winding. The excitation end generates a 1k-2MHz sine wave signal through a DDS chip (with an external 25MHz crystal oscillator), which is amplified and simultaneously excites the three-phase windings. The three-phase response data is synchronously uploaded through a wireless module with a unique address code, ensuring strict alignment of data timestamps. A single connection completes the three-phase data acquisition, avoiding contact errors caused by multiple wiring operations, and ensuring that the lateral comparison results accurately reflect the differences in winding condition.
[0038] Addressing the complex environment of transformer field testing, the wireless transformer winding deformation detection device proposed in this embodiment improves portability and battery life through integrated hardware design. The battery management unit uses a high-efficiency switching power supply chip, supports the Type-C fast charging protocol, and can operate continuously for over 8 hours with a 12V lithium battery. The fixture and grounding wire structure are directly grounded to the transformer shell / core clamps via BNC connectors, simplifying the grounding process. The BNC connectors at the excitation and response ends support multiple wiring methods such as YN type and Y type. The wireless communication module supports multi-device networking and can be expanded to more phase winding or parallel transformer testing scenarios.
[0039] Implementation Method 2: This implementation method further defines the wireless transformer winding deformation detection device described in Implementation Method 1. The excitation signal generation circuit includes a DDS chip and a drive amplifier. The DDS chip is connected to an external crystal oscillator. The DDS chip converts the digital signal output by the main control chip at the excitation end into an analog signal. The analog signal is amplified by the drive amplifier and then enters the excitation output terminal.
[0040] Implementation Method 3: This implementation method further defines the wireless transformer winding deformation detection device described in Implementation Method 1. The excitation output terminal is a BNC connector and is configured with a 50Ω output impedance.
[0041] Implementation Method 4: This implementation method further defines the wireless transformer winding deformation detection device described in Implementation Method 1. The signal acquisition circuit includes a programmable amplifier, a filter circuit, and an ADC conversion chip. The input terminal of the programmable amplifier is connected to the excitation output terminal, and the excitation output terminal is connected to the ADC conversion chip via the filter circuit. The ADC conversion chip converts the analog signal into a digital signal and transmits it to the main control chip at the response terminal.
[0042] Implementation Method 5: This implementation method further defines the wireless transformer winding deformation detection device described in Implementation Method 1. The response input terminal is a BNC connector and is configured with a 1MΩ input impedance and a voltage follower circuit.
[0043] Implementation Method Six: This implementation method further defines the wireless transformer winding deformation detection device described in Implementation Method One. The main control chip at the excitation end and the main control chip at the response end are both 32-bit STM32H743 microprocessors, and are connected to the wireless communication module via an SPI bus. The wireless communication module is a 2.4G wireless module, and each module has a unique address code.
[0044] Implementation Method Seven: This implementation method further defines the wireless transformer winding deformation detection device described in Implementation Method One. The detection device further includes a power management unit, which includes a lithium battery, a switching power supply chip, and a Type-C charging interface. The switching power supply chip converts the 12V power supply from the lithium battery into multiple system voltage sources.
[0045] Implementation Method Eight: This implementation method further defines the wireless transformer winding deformation detection device described in Implementation Method One. The detection device also includes a housing and a front panel. The excitation signal generation circuit, the excitation end main control chip, the signal acquisition circuit, and the response end main control chip are fixed inside the housing. The panel is used to enclose the housing. The excitation output end and the response input end are located outside the panel. The front panel is provided with a display screen, a power switch, a wiring display area, and a charging status indicator. A grounding terminal is also provided on the panel.
[0046] Implementation Method Nine: This implementation method further defines the wireless transformer winding deformation detection device described in Implementation Method Eight. The display screen is used to display the device address, connection status, and remaining battery power.
[0047] Implementation Method 10: This implementation method further defines the wireless transformer winding deformation detection device described in Implementation Method 1. The number of excitation terminals is one; the number of response terminals is three, corresponding to the A-phase, B-phase, and C-phase windings of the transformer, respectively, and the programmable amplifier of each response terminal switches the amplification factor according to the winding impedance.
[0048] Implementation Method 11, see below Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This embodiment describes a specific example of a wireless transformer winding deformation detection device as described in Embodiment 1, and also serves to explain Embodiments 2 to 10. Specifically:
[0049] A wireless transformer winding deformation detection device includes an excitation end and multiple response ends;
[0050] The excitation end includes an excitation signal generation circuit, an excitation output end, and an excitation end main control chip. Specifically: the excitation end uses an external 25MHz crystal oscillator DDS dedicated chip as the 14-bit digital signal output from the DDS module. The DAC conversion chip inside the DDS chip performs digital-to-analog conversion to obtain an excitation end sinusoidal analog signal. The sinusoidal analog signal is shaped by a waveform zero-point adjustment circuit, driven by an excitation signal amplifier, and output stably through a 50-ohm output impedance to drive an external transformer winding. The excitation end input signal is connected to the first end of the external winding to collect the analog signal. After passing through a 1MHz input impedance and a voltage follower circuit, it is proportionally attenuated and filtered before being stably input to a high-speed 14-bit ADC conversion chip. The ADC conversion chip converts the analog signal into a digital signal, which is transmitted to the excitation end main control chip via a high-speed FSMC bus. The excitation end main control chip uploads the collected analog signal to a remote host computer via wireless communication as the input voltage of the transformer winding. The excitation output end is connected to the response end through the transformer winding and the 50-ohm input impedance in series. The response terminal includes a signal acquisition circuit, a response input terminal, and a response terminal main control chip. Internally, the response terminal has a multi-stage programmable amplifier circuit that automatically switches the amplification factor based on the external winding impedance. The amplified signal is then filtered through a two-stage filtering circuit and stably input to a high-speed 14-bit ADC converter chip, where it is converted from an analog signal to a digital signal. This digital signal is then transmitted to the response terminal main control chip via a high-speed FSMC bus. The response terminal main control chip then uploads the acquired analog signal to a server via wireless communication, which serves as the response terminal voltage.
[0051] The excitation and response ends each use a 32-bit STM32H743 microprocessor as the main control chip, with a maximum operating frequency of 480MHz. The main control chip connects to a 2.4G wireless module via an SPI bus to achieve uplink and downlink data communication, and each wireless module has a unique address code. Both the excitation output and response input ends use BNC connectors.
[0052] like Figure 2 and Figure 3 As shown, the detection device also includes a housing and a front panel. The circuit board 6 is installed inside the housing and has an excitation signal generation circuit, an excitation end main control chip, a signal acquisition circuit, and a response end main control chip. The front panel is used to enclose the housing, and the excitation output terminal 1 and the response input terminal are located on the outside of the front panel. The front panel has a display screen, a power switch, a wiring display area, and a charging status indicator. The front panel also has a grounding terminal, and the grounding wire 2 is plugged into the grounding terminal. A clamp 3 is provided on the back of the housing for clamping onto the transformer end.
[0053] The detection device also includes a power management unit, which comprises a lithium battery, a switching power supply chip, and a Type-C charging interface 4. The switching power supply chip converts the 12V power supply from the lithium battery 7 into multiple system voltage sources. The lithium battery and the switching power supply chip are housed in the battery compartment 5 inside the casing.
[0054] The specific embodiments of this utility model disclosed above are merely illustrative of the present utility model. These specific embodiments do not exhaustively describe all details, nor do they limit the utility model to only the described embodiments. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.
Claims
1. A wireless transformer winding deformation detection device, characterized in that, The detection device includes an excitation end and multiple response ends; the excitation end and response ends achieve data transmission through a wireless communication module; the excitation end includes an excitation signal generation circuit, an excitation output end, and an excitation end main control chip; the response end includes a signal acquisition circuit, a response input end, and a response end main control chip; the excitation output end converts a digital signal into an analog signal to excite the external transformer winding through the excitation signal generation circuit; the signal at the excitation end input end is connected to the first end of the external winding to acquire an analog signal; the analog signal is converted into a digital signal through a high-speed 14-bit ADC conversion chip; the digital signal is transmitted to the excitation end main control chip via a high-speed FSMC bus; the excitation end main control chip transmits the acquired analog signal to the transformer winding as the transformer winding input voltage through the wireless communication module; the response end converts the analog signal into a digital signal through the signal acquisition circuit according to the impedance of the external winding; the response end main control chip uploads the analog signal acquired by the signal acquisition circuit to the host computer through the wireless communication module as the response end voltage.
2. The wireless transformer winding deformation detection device according to claim 1, characterized in that: The excitation signal generation circuit includes a DDS chip and a driver amplifier. The DDS chip is connected to an external crystal oscillator. The DDS chip converts the digital signal output by the main control chip at the excitation end into an analog signal. The analog signal is amplified by the driver amplifier and then enters the excitation output terminal.
3. The wireless transformer winding deformation detection device according to claim 1, characterized in that: The excitation output terminal is a BNC connector and is configured with a 50Ω output impedance.
4. The wireless transformer winding deformation detection device according to claim 1, characterized in that: The signal acquisition circuit includes a programmable amplifier, a filter circuit, and an ADC conversion chip; the input terminal of the programmable amplifier is connected to the excitation output terminal, the excitation output terminal is connected to the ADC conversion chip via the filter circuit, and the ADC conversion chip converts the analog signal into a digital signal and transmits it to the main control chip at the response terminal.
5. The wireless transformer winding deformation detection device according to claim 1, characterized in that: The response input terminal is a BNC connector and is configured with a 1MΩ input impedance and a voltage follower circuit.
6. The wireless transformer winding deformation detection device according to claim 1, characterized in that: Both the excitation and response master control chips are 32-bit STM32H743 microprocessors, and are connected to the wireless communication module via an SPI bus. The wireless communication module is a 2.4G wireless module, and each module has a unique address code.
7. The wireless transformer winding deformation detection device according to claim 1, characterized in that: The detection device also includes a power management unit, which includes a lithium battery, a switching power supply chip, and a Type-C charging interface; the switching power supply chip converts the 12V power supply of the lithium battery into multiple system voltage sources.
8. The wireless transformer winding deformation detection device according to claim 1, characterized in that: The detection device also includes a housing and a front panel. The excitation signal generation circuit, the excitation end main control chip, the signal acquisition circuit, and the response end main control chip are fixed inside the housing. The panel is used to enclose the housing. The excitation output end and the response input end are located outside the panel. The front panel is provided with a display screen, a power switch, a wiring display area, and a charging status indicator. A grounding terminal is also provided on the panel.
9. The wireless transformer winding deformation detection device according to claim 8, characterized in that: The display screen is used to show the device address, connection status, and remaining battery power.
10. The wireless transformer winding deformation detection device according to claim 1, characterized in that: The number of excitation terminals is one; the number of response terminals is three, corresponding to the A-phase, B-phase, and C-phase windings of the transformer, respectively, and the programmable amplifier of each response terminal switches the amplification factor according to the winding impedance.