A power frequency parameter testing system and tester

Abstract

The utility model relates to a kind of power frequency parameter test system and tester, power frequency parameter test system includes central processing unit, signal generating system and current acquisition system;Signal generating system includes sine excitation generation module, first signal amplification module and voltage transformer, the input end of sine excitation generation module is electrically connected with the output end of central processing unit, the input end of first signal amplification module is electrically connected with the output end of sine excitation generation module, the input end of voltage transformer is electrically connected with the first output end of first signal amplification module, the output end of voltage transformer is used to connect pole tower ground wire;Current acquisition system includes current transformer and signal processing circuit.The utility model amplifies excitation signal to a higher, stable voltage and power level by first signal amplification module, ensures that excitation signal can still maintain sufficient amplitude when being transmitted to ground wire, to generate a current signal that can be clearly captured by current transformer.

Description

Technical Field

[0001] This utility model relates to the field of grounding resistance measurement technology, specifically to a power frequency parameter testing system and instrument. Background Technology

[0002] In the operation and maintenance of power systems, accurate measurement of power frequency parameters (such as tower grounding resistance and soil resistivity) is crucial for ensuring power grid safety and preventing equipment damage and electric shock accidents. Traditional testing methods generally employ manual balancing bridge methods or measurement methods based on analog pointer instruments. These methods are not only cumbersome and inefficient, but also heavily reliant on the operator's experience, highly subjective, and produce inconsistent measurement results.

[0003] With the development of electronic technology, some semi-automatic or digital grounding resistance testers have emerged. However, these existing devices still have significant shortcomings in the signal generation and excitation stages. Most existing devices directly use a sinusoidal excitation generation module as the test excitation source (for example, the invention application CN105467220A, entitled "A Portable Grounding Resistance Tester," generates the excitation signal through a signal generation module). Because the excitation signal is extremely prone to attenuation during transmission, especially when measuring long-distance, large-size grounding grids or in environments with high soil resistivity, the signal-to-noise ratio drops sharply, making it difficult to accurately acquire the effective signal. Utility Model Content

[0004] Based on the above description, this utility model provides a power frequency parameter testing system and instrument, which aims to solve the problem that the excitation signal generated by the existing power frequency parameter testing system is easily attenuated during transmission when using a signal generation module as the test excitation source.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: Firstly, a power frequency parameter testing system includes: CPU; The signal generation system includes a sinusoidal excitation generation module, a first signal amplification module, and a voltage transformer. The input terminal of the sinusoidal excitation generation module is electrically connected to the output terminal of the central processing unit. The input terminal of the first signal amplification module is electrically connected to the output terminal of the sinusoidal excitation generation module. The input terminal of the voltage transformer is electrically connected to the first output terminal of the first signal amplification module. The output terminal of the voltage transformer is used to connect to the tower grounding wire. The current acquisition system includes a current transformer and a signal processing circuit. The input terminal of the current transformer is used to connect to the grounding wire of the tower. The input terminal of the signal processing circuit is electrically connected to the output terminal of the current transformer. The output terminal of the signal processing circuit is electrically connected to the first input terminal of the central processing unit.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the signal generation system includes a power amplification module, the input and output terminals of which are electrically connected one-to-one to the first output terminal of the first signal amplification module and the input terminal of the voltage transformer.

[0008] Furthermore, the signal processing circuit includes an AC / DC conversion module and an analog-to-digital conversion module. The input terminal of the AC / DC conversion module is electrically connected to the output terminal of the current transformer, and the input and output terminals of the analog-to-digital conversion module are electrically connected one-to-one to the output terminal of the AC / DC conversion module and the first input terminal of the central processing unit.

[0009] Furthermore, the signal processing circuit includes a bandpass filter module, the input and output terminals of which are electrically connected one-to-one to the output terminal of the current transformer and the input terminal of the AC / DC conversion module.

[0010] Furthermore, the signal processing circuit includes a second signal amplification module, the input and output terminals of which are electrically connected one-to-one to the output terminal of the bandpass filter module and the input terminal of the AC / DC conversion module.

[0011] Furthermore, it includes a phase detection module, wherein the first input terminal and the second input terminal of the phase detection module are electrically connected one-to-one to the second output terminal of the first signal amplification module and the second output terminal of the second signal amplification module, and the output terminal of the phase detection module is electrically connected to the second input terminal of the central processing unit.

[0012] Furthermore, it includes a communication module, which is bidirectionally connected to the central processing unit.

[0013] Furthermore, it includes a control panel, which is bidirectionally connected to the central processing unit.

[0014] Furthermore, the control panel is a configuration panel.

[0015] In a second aspect, a power frequency parameter tester includes a power frequency parameter testing system as described in the first aspect.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: (1) The present invention amplifies the excitation signal to a higher and more stable voltage and power level through the first signal amplification module, ensuring that the excitation signal can still maintain a sufficient amplitude when transmitted to the ground wire, so as to generate a current signal that can be clearly captured by the current transformer.

[0017] (2) This utility model improves the driving capability of the output excitation signal through the power amplification module, ensuring that the signal quality can still be maintained under long distance or high impedance load conditions.

[0018] (3) This utility model realizes real-time detection of phase difference through phase detection module, which provides key data for the calculation of impedance parameters, reduces the computing burden of central processing unit and improves the efficiency of on-site testing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a power frequency parameter testing system provided in an embodiment of this utility model; Figure 2 This is a circuit diagram of the central processing unit in an embodiment of the present invention; Figure 3 This is a circuit diagram of the sinusoidal excitation generation module in an embodiment of the present invention; Figure 4 This is a circuit diagram of the first signal amplification module and the power amplification module in an embodiment of this utility model; Figure 5 This is a circuit diagram of the AC / DC conversion module in an embodiment of this utility model; Figure 6 This is a circuit diagram of the bandpass filter module in an embodiment of this utility model; Figure 7 This is a circuit diagram of the second signal amplification module in an embodiment of this utility model; Figure 8 This is a circuit diagram of the phase detection module in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Central Processing Unit; 2. Signal generation system; 21. Sine wave excitation generation module; 22. First signal amplification module; 23. Voltage transformer; 24. Power amplification module; 3. Current acquisition system; 31. Current transformer; 32. Signal processing circuit; 321. AC / DC conversion module; 322. Analog-to-digital conversion module; 323. Bandpass filter module; 324. Second signal amplification module; 4. Phase detection module; 5. Communication module; 6. Control panel. Detailed Implementation

[0022] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0024] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "under" or "below" of other elements or features will be oriented "over" of other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0025] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0026] Reference Figures 1 to 4As shown, this utility model provides a technical solution: a power frequency parameter testing system, including a central processing unit 1, a signal generation system 2, and a current acquisition system 3; the signal generation system 2 includes a sinusoidal excitation generation module 21, a first signal amplification module 22, and a voltage transformer 23. The input terminal of the sinusoidal excitation generation module 21 is electrically connected to the output terminal of the central processing unit 1, the input terminal of the first signal amplification module 22 is electrically connected to the output terminal of the sinusoidal excitation generation module 21, the input terminal of the voltage transformer 23 is electrically connected to the first output terminal of the first signal amplification module 22, and the output terminal of the voltage transformer 23 is used to connect to the tower grounding wire; the current acquisition system 3 includes a current transformer 31 and a signal processing circuit 32. The input terminal of the current transformer 31 is used to connect to the tower grounding wire, the input terminal of the signal processing circuit 32 is electrically connected to the output terminal of the current transformer 31, and the output terminal of the signal processing circuit 32 is electrically connected to the first input terminal of the central processing unit 1.

[0027] In this embodiment, the central processing unit 1 controls the sinusoidal excitation generation module 21 to generate a power frequency sinusoidal signal. After being amplified by the first signal amplification module 22, the signal is coupled to the tower grounding wire through the voltage transformer 23. The current transformer 31 collects the response current of the tower grounding wire, processes it through the signal processing circuit 32, and transmits it to the central processing unit 1 to calculate the impedance parameters. The first signal amplification module 22 amplifies the excitation signal to a higher and more stable voltage and power level, ensuring that the excitation signal maintains sufficient amplitude when transmitted to the grounding wire to generate a current signal that can be clearly captured by the current transformer 31.

[0028] Reference Figure 1 and Figure 4 As shown, in some embodiments, the signal generation system 2 includes a power amplification module 24, the input and output terminals of which are electrically connected one-to-one to the first output terminal of the first signal amplification module 22 and the input terminal of the voltage transformer 23.

[0029] In this embodiment, the power amplification module 24 is connected between the first signal amplification module 22 and the voltage transformer 23, enabling further power amplification of the excitation signal. This improves the driving capability of the output excitation signal and ensures that signal quality is maintained even under long-distance or high-impedance load conditions.

[0030] Reference Figure 1 and Figure 5 As shown, in some embodiments, the signal processing circuit 32 includes an AC / DC conversion module 321 and an analog-to-digital conversion module 322. The input terminal of the AC / DC conversion module 321 is electrically connected to the output terminal of the current transformer 31, and the input and output terminals of the analog-to-digital conversion module 322 are electrically connected one-to-one to the output terminal of the AC / DC conversion module 321 and the first input terminal of the central processing unit 1.

[0031] In this embodiment, the AC / DC conversion module 321 converts the current signal collected by the current transformer 31 from AC to DC, while the analog-to-digital conversion module 322 converts the converted DC current signal into a digital signal for processing by the central processing unit 1. The analog-to-digital conversion module 322 enables the digital processing of the converted DC current signal, facilitating analysis and storage by the central processing unit 1.

[0032] Reference Figure 1 and Figure 6 As shown, in some embodiments, the signal processing circuit 32 includes a bandpass filter module 323, the input and output terminals of which are electrically connected one-to-one to the output terminal of the current transformer 31 and the input terminal of the AC / DC conversion module 321.

[0033] In this embodiment, a bandpass filter module 323 is disposed between the current transformer 31 and the AC / DC conversion module 321. When the current signal collected by the current transformer 31 is received, it filters out non-power frequency interference signals. The bandpass filter module 323 can improve the anti-interference capability of the signal processing circuit 32, ensure signal purity, and guarantee the accuracy of impedance parameters.

[0034] Reference Figure 1 and Figure 7 As shown, in some embodiments, the signal processing circuit 32 includes a second signal amplification module 324, the input and output terminals of which are electrically connected one-to-one to the output terminal of the bandpass filter module 323 and the input terminal of the AC / DC conversion module 321.

[0035] In this embodiment, when the current signal passes through the second signal amplification module 324, the second signal amplification module 324 amplifies the current signal. This enhances the amplitude of weak signals, avoids attenuation of the current signal during transmission and processing, and further improves the signal-to-noise ratio of the current signal.

[0036] Reference Figure 1 and Figure 8 As shown, in some embodiments, the power frequency parameter testing system includes a phase detection module 4. The first input terminal and the second input terminal of the phase detection module 4 are electrically connected to the second output terminal of the first signal amplification module 22 and the second output terminal of the second signal amplification module 324 in a one-to-one correspondence. The output terminal of the phase detection module 4 is electrically connected to the second input terminal of the central processing unit 1.

[0037] In this embodiment, the first signal amplification and processing module sends an excitation signal to the phase detection module 4, and the second signal amplification and processing module sends a current signal to the phase detection module 4. The phase detection module 4 acquires the phases of the excitation signal and the current signal, calculates the phase difference, and transmits it to the central processing unit 1. Real-time detection of the phase difference is achieved through the phase detection module 4, providing crucial data for impedance parameter calculation, reducing the computational burden on the central processing unit 1, and improving on-site testing efficiency.

[0038] Reference Figure 1 As shown, in some embodiments, the power frequency parameter testing system includes a communication module 5, which is bidirectionally connected to the central processing unit 1.

[0039] In this embodiment, the communication module 5 is used to communicate with the mobile device, enabling the mobile device to communicate with the central processing unit 1 through the communication module 5. The user can operate the mobile device to set parameters (such as the output frequency of the power frequency sine wave signal).

[0040] Reference Figure 1 As shown, in some embodiments, the power frequency parameter testing system includes a control panel 6, which is bidirectionally connected to the central processing unit 1.

[0041] In this embodiment, the control screen 6 communicates with the central processing unit 1, allowing the user to both operate the control screen 6 to set parameters and view results (such as impedance parameters).

[0042] Optionally, control panel 6 is a configuration panel.

[0043] In embodiments of this utility model, the power frequency parameter testing system can be powered by a power supply, which can be a battery or an external power source, etc.

[0044] This utility model provides a technical solution: a power frequency parameter tester, including the above-mentioned power frequency parameter test system.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A power frequency parameter testing system, characterized in that, include: Central processing unit (1); The signal generation system (2) includes a sinusoidal excitation generation module (21), a first signal amplification module (22), and a voltage transformer (23). The input terminal of the sinusoidal excitation generation module (21) is electrically connected to the output terminal of the central processing unit (1). The input terminal of the first signal amplification module (22) is electrically connected to the output terminal of the sinusoidal excitation generation module (21). The input terminal of the voltage transformer (23) is electrically connected to the first output terminal of the first signal amplification module (22). The output terminal of the voltage transformer (23) is used to connect the tower grounding wire. The current acquisition system (3) includes a current transformer (31) and a signal processing circuit (32). The input terminal of the current transformer (31) is used to connect to the grounding wire of the tower. The input terminal of the signal processing circuit (32) is electrically connected to the output terminal of the current transformer (31). The output terminal of the signal processing circuit (32) is electrically connected to the first input terminal of the central processing unit (1).

2. The power frequency parameter testing system according to claim 1, characterized in that, The signal generation system (2) includes a power amplification module (24), the input and output terminals of which are electrically connected one-to-one to the first output terminal of the first signal amplification module (22) and the input terminal of the voltage transformer (23).

3. The power frequency parameter testing system according to claim 1, characterized in that, The signal processing circuit (32) includes an AC / DC conversion module (321) and an analog-to-digital conversion module (322). The input terminal of the AC / DC conversion module (321) is electrically connected to the output terminal of the current transformer (31). The input terminal and the output terminal of the analog-to-digital conversion module (322) are electrically connected one-to-one to the output terminal of the AC / DC conversion module (321) and the first input terminal of the central processing unit (1).

4. The power frequency parameter testing system according to claim 3, characterized in that, The signal processing circuit (32) includes a bandpass filter module (323), the input and output terminals of which are electrically connected one-to-one to the output terminal of the current transformer (31) and the input terminal of the AC / DC conversion module (321).

5. The power frequency parameter testing system according to claim 4, characterized in that, The signal processing circuit (32) includes a second signal amplification module (324), the input and output terminals of which are electrically connected one-to-one to the output terminal of the bandpass filter module (323) and the input terminal of the AC / DC conversion module (321).

6. The power frequency parameter testing system according to claim 5, characterized in that, The system includes a phase detection module (4), whose first and second input terminals are electrically connected one-to-one to the second output terminal of the first signal amplification module (22) and the second output terminal of the second signal amplification module (324), and whose output terminal is electrically connected to the second input terminal of the central processing unit (1).

7. The power frequency parameter testing system according to claim 1, characterized in that, It includes a communication module (5), which is bidirectionally connected to the central processing unit (1).

8. The power frequency parameter testing system according to claim 1, characterized in that, It includes a control screen (6), which is bidirectionally connected to the central processing unit (1).

9. The power frequency parameter testing system according to claim 8, characterized in that, The control panel (6) is a configuration panel.

10. A power frequency parameter tester, characterized in that, Including the power frequency parameter testing system according to any one of claims 1 to 9.

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