Sampling device of single-current harmonic phase method

Abstract

The utility model provides a sampling device for a single-current harmonic phase method, which relates to the field of power electronics and comprises a sampling device body, and a, b and c are arranged on the surface of the sampling device body. The sampling device main body comprises a sampling module, a harmonic extraction module, a phase calculation module, a resistive current calculation module, a data processing and storage module, a communication module and a remote monitoring module; according to the utility model, inversion is carried out through the phase alignment relation of the third harmonic and the fundamental wave, the fundamental wave voltage vector at the end part of the lightning arrester is indirectly obtained, the secondary voltage signal of a voltage transformer does not need to be extracted, the operation is simpler, the safety risk is low, and the detection accuracy is improved by adopting a single-phase current harmonic detection method to carry out current sampling and Fourier decomposition. The problems that the sensitivity of a leakage total current detection method is not enough, and comparison signals need to be collected from a voltage transformer are solved, the monitoring efficiency is improved, the maintenance cost is reduced, and the safety is improved.

Description

Technical Field

[0001] This invention belongs to the field of power electronics, specifically a sampling device based on the single-current harmonic phase method. Background Technology

[0002] A surge arrester is an electrical device used to protect electrical equipment from high transient overvoltages and to limit the duration and amplitude of follow current. It is mainly used to limit overvoltages caused by system operation or lightning strikes, and to protect electrical equipment from damage. Single-phase current harmonic detection of surge arresters is of great significance for timely detection of potential faults in surge arresters and prevention of power system accidents.

[0003] By detecting harmonic currents, the actual operating status of surge arresters in the power grid can be assessed, ensuring that they can effectively absorb overvoltages and protect other electrical equipment. Traditional live-line testing of surge arresters requires extracting the secondary voltage signal of the voltage transformer, which is complex and time-consuming.

[0004] In summary, this invention provides a sampling device based on the single-current harmonic phase method to solve the above-mentioned problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A sampling device for a single-current harmonic phase method includes a sampling device body with a, b, and c on its surface. The sampling device body includes a sampling module, a harmonic extraction module, a phase calculation module, a resistive current calculation module, a data processing and storage module, a communication module, and a remote monitoring module. The output terminal of the sampling module is connected to the input terminal of the harmonic extraction module, the output terminal of the harmonic extraction module is connected to the input terminal of the phase calculation module, the output terminal of the phase calculation module is connected to the input terminal of the resistive current calculation module, the output terminal of the resistive current calculation module is connected to the input terminal of the data processing and storage module, the output terminal of the data processing and storage module is connected to the input terminal of the communication module, and the output terminal of the communication module is connected to the input terminal of the remote monitoring module.

[0007] Furthermore, in this invention, the sampling module uses a high-precision current sensor to collect the single current signal of the surge arrester, and the harmonic extraction module performs Fourier transform on the sampled full current signal to extract each harmonic component.

[0008] Furthermore, in this invention, the phase calculation module calculates the phase difference between each harmonic and the fundamental wave based on the extracted harmonic components, and the resistive current calculation module calculates the resistive current of the surge arrester using the single-current harmonic phase method based on the phase difference and harmonic components.

[0009] Furthermore, in this invention, the data processing and storage module employs a high-performance data processing chip and storage device to process and store the calculated resistive current.

[0010] Furthermore, in this invention, the communication module adopts a standard communication protocol and interface to transmit the calculated resistive current data to the remote monitoring module through the communication interface.

[0011] Furthermore, in this utility model, 'a' is an inlet bolt, 'b' is an antenna, and 'c' is a data power line.

[0012] Beneficial effects: This utility model has the following beneficial effects:

[0013] This invention relates to single-phase current harmonic detection, which calculates the result of Fourier decomposition of the fundamental leakage current. Traditional surge arrester live testing requires extracting the secondary voltage signal from the voltage transformer, a complex and time-consuming operation. However, the module based on single-phase current harmonic detection eliminates this step, requiring only the measurement of the surge arrester's leakage current and extraction of harmonic components. This significantly simplifies the operation and improves monitoring efficiency. By inverting the phase alignment relationship between the third harmonic and the fundamental wave, the fundamental voltage vector at the surge arrester's end is indirectly obtained, eliminating the need to extract the secondary voltage signal from the voltage transformer. This makes the operation simpler and reduces safety risks. The single-phase current harmonic detection method, which performs current sampling and Fourier decomposition, solves the problem of insufficient sensitivity in the full leakage current detection method, which requires the acquisition of comparison signals from the voltage transformer. This improves monitoring efficiency, reduces maintenance costs, and enhances safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the front view of the present invention.

[0015] Figure 2 This is a side view schematic diagram of the structure of this utility model;

[0016] Figure 3 This is a system flowchart of this utility model.

[0017] In the picture:

[0018] 1. Main body of sampling device; 101. Sampling module; 102. Harmonic extraction module; 103. Phase calculation module; 104. Resistive current calculation module; 105. Data processing and storage module; 106. Communication module; 107. Remote monitoring module. Detailed Implementation

[0019] To better understand the technical content of this utility model, specific embodiments are described below in conjunction with the accompanying drawings. Various aspects of this utility model are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments of this disclosure are not necessarily defined to include all aspects of this utility model. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in this utility model are not limited to any particular implementation. Furthermore, some aspects of this utility model can be used alone or in any suitable combination with other aspects disclosed in this utility model.

[0020] Example 1

[0021] like Figure 1-3 As shown, this is the first embodiment of the present invention. This embodiment provides a sampling device for a single-current harmonic phase method, including a sampling device body 1. The surface of the sampling device body 1 is provided with a, b, and c. The sampling device body 1 includes a sampling module 101, a harmonic extraction module 102, a phase calculation module 103, a resistive current calculation module 104, a data processing and storage module 105, a communication module 106, and a remote monitoring module 107. The output terminal of the sampling module 101 is connected to the input terminal of the harmonic extraction module 102. The output terminal of the harmonic extraction module 102 is connected to the input terminal of the phase calculation module 103. The output terminal of the phase calculation module 103 is connected to the input terminal of the resistive current calculation module 104. The output terminal of the resistive current calculation module 104 is connected to the input terminal of the data processing and storage module 105. The output terminal of the data processing and storage module 105 is connected to the input terminal of the communication module 106. The output terminal of the communication module 106 is connected to the input terminal of the remote monitoring module 107.

[0022] like Figure 1-3As shown, sampling module 101 is used to acquire the single current signal of the surge arrester, which contains fundamental and harmonic components. Sampling module 101 uses a high-precision current sensor to ensure accurate signal acquisition. Harmonic extraction module 102 performs Fourier transform on the sampled full current signal to extract each harmonic component, especially the third harmonic component. Harmonic extraction module 102 uses a fast Fourier transform algorithm to improve calculation speed and accuracy. Phase calculation module 103 calculates the phase difference between each harmonic and the fundamental wave based on the extracted harmonic components. Phase calculation module 103 uses a phase measurement algorithm to ensure accurate phase calculation. Resistive current calculation module 104 calculates the phase difference based on the phase difference and harmonic components. The resistive current of the surge arrester is calculated using the single-current harmonic phase method. The resistive current calculation module 104 uses a specific algorithm to convert harmonic components into resistive current, improving calculation accuracy. The data processing and storage module 105 processes and stores the calculated resistive current data for subsequent analysis and processing. The data processing and storage module 105 uses high-performance data processing chips and storage devices to ensure real-time data processing and storage. The communication module 106 transmits the calculated resistive current data to the remote monitoring module 107 through a communication interface to realize remote monitoring and data analysis. The communication module 106 uses standard communication protocols and interfaces to ensure reliable data transmission.

[0023] Example 2

[0024] Reference Figure 1 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0025] In this embodiment, the sampling module 101 uses a high-precision current sensor to collect the single current signal of the surge arrester, and the harmonic extraction module 102 performs Fourier transform on the sampled full current signal to extract each harmonic component.

[0026] The phase calculation module 103 calculates the phase difference between each harmonic and the fundamental wave based on the extracted harmonic components, and the resistive current calculation module 104 calculates the resistive current of the surge arrester based on the phase difference and harmonic components using the single-current harmonic phase method.

[0027] like Figure 1As shown, sampling module 101 is used to acquire the single current signal of the surge arrester, which contains fundamental and harmonic components. Sampling module 101 uses a high-precision current sensor to ensure accurate signal acquisition. Harmonic extraction module 102 performs Fourier transform on the sampled full current signal to extract each harmonic component, especially the third harmonic component. Harmonic extraction module 102 uses a fast Fourier transform algorithm to improve calculation speed and accuracy. Phase calculation module 103 calculates the phase difference between each harmonic and the fundamental wave based on the extracted harmonic components. Phase calculation module 103 uses a phase measurement algorithm to ensure accurate phase calculation. Resistive current calculation module 104 calculates the resistive current of the surge arrester based on the phase difference and harmonic components using the single current harmonic phase method. Resistive current calculation module 104 uses a specific algorithm to convert harmonic components into resistive current, improving calculation accuracy.

[0028] Example 3

[0029] Reference Figure 2 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0030] In this embodiment, the data processing and storage module 105 uses a high-performance data processing chip and storage device to process and store the calculated resistive current.

[0031] The communication module 106 uses standard communication protocols and interfaces to transmit the calculated resistive current data to the remote monitoring module 107 through the communication interface.

[0032] a is the cable inlet bolt, b is the antenna, and c is the data and power cable.

[0033] like Figure 2 As shown, the data processing and storage module 105 processes and stores the calculated resistive current data for subsequent analysis and processing. The data processing and storage module 105 adopts high-performance data processing chips and storage devices to ensure real-time data processing and storage. The communication module 106 transmits the calculated resistive current data to the remote monitoring module 107 through the communication interface to realize remote monitoring and data analysis. The communication module 106 adopts standard communication protocols and interfaces to ensure reliable data transmission.

[0034] In use, a high-precision current sensor is used to collect the leakage current of the surge arrester to ensure the accuracy of the acquisition. An analog signal processing circuit, including an amplifier circuit and a filter circuit, is prepared to preprocess the acquired signal, extract the third harmonic component, process the data, and perform Fourier decomposition on the continuous current based on the phase of the obtained fundamental voltage to obtain the capacitive current vector. Finally, the capacitive current is obtained by subtracting the continuous current from the capacitive current. This sampling and calculation module changes the risks and shortcomings of the current capacitive current compensation method in the acquisition of the fundamental voltage phase. It eliminates the need to extract the secondary voltage signal of the voltage transformer, making the operation simpler, reducing safety risks, improving monitoring efficiency, and reducing operation and maintenance costs.

[0035] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail in this application.

[0036] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A sampling device for single current harmonic phasing method, comprising a sampling device body (1), characterized in that: The surface of the sampling device body (1) is provided with a, b and c. The sampling device body (1) includes a sampling module (101), a harmonic extraction module (102), a phase calculation module (103), a resistive current calculation module (104), a data processing and storage module (105), a communication module (106) and a remote monitoring module (107). The output end of the sampling module (101) is connected to the input end of the harmonic extraction module (102). The output end of the harmonic extraction module (102) is connected to the input end of the phase calculation module (103). The output end of the phase calculation module (103) is connected to the input end of the resistive current calculation module (104). The output end of the resistive current calculation module (104) is connected to the input end of the data processing and storage module (105). The output end of the data processing and storage module (105) is connected to the input end of the communication module (106). The output end of the communication module (106) is connected to the input end of the remote monitoring module (107).

2. The sampling device for single current harmonic phase method as claimed in claim 1, wherein: The sampling module (101) uses a high-precision current sensor to collect the single current signal of the surge arrester. The harmonic extraction module (102) performs Fourier transform on the sampled full current signal to extract each harmonic component.

3. The sampling device for single current harmonic phase method as claimed in claim 1, wherein: The phase calculation module (103) calculates the phase difference between each harmonic and the fundamental wave based on the extracted harmonic components, and the resistive current calculation module (104) calculates the resistive current of the surge arrester using the single-current harmonic phase method based on the phase difference and harmonic components.

4. The sampling device for single current harmonic phase method as claimed in claim 1, wherein: The data processing and storage module (105) uses a high-performance data processing chip and storage device to process and store the calculated resistive current.

5. The sampling device for single current harmonic phase method as claimed in claim 1, wherein: The communication module (106) uses a standard communication protocol and interface to transmit the calculated resistive current data to the remote monitoring module (107) through the communication interface.

6. The sampling device for single current harmonic phase method as claimed in claim 1, wherein: a is the cable inlet bolt, b is the antenna, and c is the data power cable.

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