Cable discharge collection method and device, terminal equipment and storage medium

Abstract

The invention discloses a cable discharge acquisition method and device, terminal equipment and a storage medium. The method comprises the following steps: acquiring high-frequency current acquisition data and capacitance acquisition data based on a high-frequency current acquisition channel and a capacitance acquisition channel; based on the preset high-frequency current local oscillation frequency, the high-frequency current local amplitude value and the high-frequency current acquisition data, repeatedly executing the high-frequency current frequency mixing data acquisition step until the high-frequency current local oscillation frequency is equal to the preset high-frequency current local oscillation frequency value to obtain a high-frequency current frequency mixing data set; based on the preset capacitance local oscillation frequency, the capacitance local amplitude value and the capacitance acquisition data, repeatedly executing the capacitance frequency mixing data acquisition step until the capacitance local oscillation frequency is equal to the preset capacitance local oscillation frequency value to obtain a capacitance frequency mixing data set; and selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the data, and performing discharge information acquisition on the to-be-detected cable through the target acquisition channel, thereby improving the detection efficiency in the partial discharge process.

Description

Technical Field

[0001] This invention relates to the field of cable discharge acquisition, and in particular to a cable discharge acquisition method, apparatus, terminal equipment, and storage medium. Background Technology

[0002] With the advent of the era of intelligent and information technology, electricity has become an indispensable energy source in people's daily lives, and the reliability of power supply is crucial to people's daily life and production. In urban power distribution networks, power cables of various voltage levels gradually form a complex distribution network. Power cables are typical capacitive electrical equipment, and local insulation damage will lead to the failure of the entire insulation system. Therefore, realizing condition monitoring of cable insulation is key to the safe and stable operation of urban power systems.

[0003] When partial discharge occurs in a cable, various signals are generated. The resulting pulse current signal is often used as key monitoring information in partial discharge detection technology to determine whether there is partial discharge inside the cable. Currently, the most commonly used sensor for detecting cable pulse current signals is the high-frequency current sensor (HFCT). However, due to the limitations of the material itself, the upper limit of the response frequency of current HFCT sensors is relatively low, generally around 50MHz. Therefore, when the signal frequency generated inside the partial discharge is high, HFCT cannot be used to obtain accurate partial discharge information. Some manufacturers and research institutions use capacitance as the detection of discharge pulse signals, constructing capacitive sensors. They utilize the better response characteristics in the high-frequency band to achieve signal detection in the frequency band of 50MHz and above. Therefore, existing technologies usually use HFCT and capacitive sensors simultaneously. However, this process usually requires two independent high-speed sampling and processing channels. Although this dual-channel parallel acquisition and processing architecture can ensure the detection bandwidth, it inevitably leads to the back-end system needing to simultaneously process two massive high-speed data streams, performing complex signal alignment, fusion, and parallel analysis. This results in a heavy data processing burden, low utilization of computing resources, slow overall system response, and low detection process efficiency. Summary of the Invention

[0004] This invention provides a cable discharge acquisition method, device, terminal equipment, and storage medium, which can solve the above-mentioned problems and improve the detection efficiency during partial discharge.

[0005] This invention provides a cable discharge acquisition method applied to a dual-channel multiplexing acquisition system. The dual-channel multiplexing acquisition system includes a high-frequency current acquisition channel and a capacitance acquisition channel. The high-frequency current acquisition channel is connected to the cable grounding signal of the cable under test, and the capacitance acquisition channel is connected to the cable grounding signal of the cable under test. The method includes: The high-frequency current acquisition data of the cable under test is obtained based on the high-frequency current acquisition channel, and the capacitance acquisition data of the cable under test is obtained based on the capacitance acquisition channel. Based on the preset high-frequency current local oscillator frequency, the pre-acquired high-frequency current local oscillator amplitude value, and the high-frequency current acquisition data, the high-frequency current mixing data acquisition step is repeatedly executed until the high-frequency current local oscillator frequency is equal to the preset high-frequency current local oscillator frequency value, and a high-frequency current mixing data set is obtained. Based on the preset capacitor local oscillator frequency, the pre-acquired capacitor local oscillator amplitude value, and the capacitor acquisition data, the capacitor mixing data acquisition step is repeated until the capacitor local oscillator frequency is equal to the preset capacitor local oscillator frequency value, and a capacitor mixing data set is obtained. Based on the high-frequency current mixing data set, the high-frequency current amplitude value, the capacitor mixing data set, and the capacitor amplitude value, a target acquisition channel is selected from the high-frequency current acquisition channel and the capacitor acquisition channel to acquire discharge information of the cable under test through the target acquisition channel; Specifically: each time a high-frequency current mixing data acquisition step is executed, a first sum of a preset first frequency value and the high-frequency current local oscillator frequency is acquired, and the first sum is used as the new high-frequency current local oscillator frequency; each time a capacitor mixing data acquisition step is executed, a second sum of a preset second frequency value and the capacitor local oscillator frequency is acquired, and the second sum is used as the new capacitor local oscillator frequency.

[0006] In the above scheme, by acquiring high-frequency current acquisition data and capacitance acquisition data separately, and combining the high-frequency current local oscillator frequency updated repeatedly based on a preset first frequency value and the capacitance local oscillator frequency updated repeatedly based on a preset second frequency value, the high-frequency current mixing data set and capacitance mixing data set of the two channels are accurately detected. This enables effective evaluation of the distribution of high-frequency current acquisition data and capacitance acquisition data in their respective effective frequency bands. This allows for accurate determination of whether the discharge information of the cable under test is mainly concentrated in low or high frequencies. Furthermore, the acquisition channel selection is completed through the high-frequency current mixing data set, the high-frequency current local oscillator amplitude value, the capacitance mixing data set, and the capacitance local oscillator amplitude value, effectively selecting a more reliable target acquisition channel. The traditional dual-channel parallel processing architecture is optimized into a single-channel gating acquisition mode. While ensuring wide bandwidth coverage, the amount of data processed in the subsequent processing is significantly reduced, and the data processing efficiency of cable partial discharge detection is significantly improved.

[0007] Further, based on the preset high-frequency current local oscillator frequency, the pre-acquired high-frequency current local oscillator amplitude value, and the high-frequency current acquisition data, the high-frequency current mixing data acquisition step is repeatedly executed until the high-frequency current local oscillator frequency equals the preset high-frequency current local oscillator frequency value, thus obtaining the high-frequency current mixing data set. The high-frequency current mixing data acquisition step includes: The high-frequency current local oscillator signal is obtained based on the high-frequency current local oscillator frequency and the high-frequency current local amplitude value. High-frequency current mixing data is obtained based on the high-frequency current local oscillator signal and the high-frequency current acquisition data.

[0008] In the above scheme, the high-frequency signal is converted into a frequency by mixing the high-frequency current local oscillator signal with the high-frequency current acquisition data. This provides a basis for the subsequent extraction of the amplitude information of the signal in the corresponding frequency band, and thus provides a data basis for the subsequent channel selection decision process.

[0009] Further, obtaining the high-frequency current local oscillator signal based on the high-frequency current local oscillator frequency and the high-frequency current local amplitude includes: The data sensing time for acquiring the high-frequency current acquisition data; The high-frequency current local oscillator frequency and the data sensing time are cosine processed to obtain the high-frequency current local oscillator cosine value. The high-frequency current local oscillator signal is obtained by multiplying the cosine value of the high-frequency current local oscillator and the amplitude value of the high-frequency current local oscillator.

[0010] In the above scheme, a continuous high-frequency current local oscillator signal is generated by cosine processing based on the data sensing time, which ensures the waveform accuracy and timing continuity of the local oscillator signal, and provides the necessary conditions for subsequent stable and reliable mixing operation.

[0011] Further, the step of selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the high-frequency current mixing data set, the high-frequency current amplitude value, the capacitance mixing data set, and the capacitance amplitude value, so as to acquire discharge information of the cable under test through the target acquisition channel, includes: Based on the high-frequency current mixing data set and the high-frequency current amplitude value, a high-frequency current amplitude set is obtained; Select the high-frequency current amplitude with the largest value from the set of high-frequency current amplitudes as the target high-frequency current amplitude; Based on the capacitor mixing data set and the capacitor amplitude value, a capacitor amplitude set is obtained; Select the capacitance value with the largest value from the set of capacitance values ​​as the target capacitance value; Based on the target high-frequency current amplitude and the target capacitance amplitude, a target acquisition channel is selected from the high-frequency current acquisition channel and the capacitance acquisition channel to acquire discharge information of the cable under test through the target acquisition channel.

[0012] In the above scheme, by selecting the largest amplitude value from the high-frequency current amplitude set and the capacitance amplitude set respectively and comparing them, it is possible to accurately determine whether the energy of the partial discharge signal is mainly concentrated in the low-frequency band or the high-frequency band, thereby providing a direct and reliable basis for selecting the most suitable target acquisition channel.

[0013] Further, the step of obtaining a high-frequency current amplitude set based on the high-frequency current mixing data set and the high-frequency current local amplitude value includes: The high-frequency current mixing data set is subjected to low-pass filtering to obtain a high-frequency current filtered mixing data set; Based on the high-frequency current filtering mixing data set, determine the high-frequency current filtering mixing amplitude set; Based on the high-frequency current filtering mixing amplitude set and the high-frequency current local amplitude value, a high-frequency current amplitude set is obtained.

[0014] In the above scheme, by performing low-pass filtering on the high-frequency current mixing data set and determining its amplitude, the low-frequency component characterizing the original signal strength is effectively separated, and the amplitude information is obtained at a lower sampling rate, thus achieving efficient extraction of the high-frequency current amplitude set.

[0015] Further, the step of obtaining the high-frequency current amplitude set based on the high-frequency current filtered mixing amplitude set and the high-frequency current local oscillator amplitude value includes: The high-frequency current product value is obtained by multiplying the amplitude value of the high-frequency current with the preset mixing coefficient. The high-frequency current amplitude set is obtained based on the ratio of the high-frequency current filter mixing amplitude set to the high-frequency current product value.

[0016] In the above scheme, by calculating the ratio of the high-frequency current filtered mixing amplitude set to the high-frequency current local amplitude and the preset mixing coefficient, the original signal strength of the high-frequency current acquisition channel can be reversed to restore it, thereby eliminating the influence of the high-frequency current local amplitude and ensuring the accuracy and fairness of cross-channel amplitude comparison.

[0017] Further, the step of selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the target high-frequency current amplitude and the target capacitance amplitude, so as to acquire discharge information of the cable under test through the target acquisition channel, includes: The target high-frequency current amplitude and the target capacitance amplitude are compared. When the target high-frequency current amplitude is greater than the target capacitance amplitude, the high-frequency current acquisition channel is used as the target acquisition channel. When the amplitude of the target high-frequency current is less than the amplitude of the target capacitance, the capacitance acquisition channel is used as the target acquisition channel.

[0018] In the above scheme, a clear target acquisition channel selection logic is generated by directly comparing the magnitude of the target high-frequency current and the target capacitance.

[0019] Another embodiment of the present invention provides a cable discharge acquisition device applied to a dual-channel multiplexing acquisition system. The dual-channel multiplexing acquisition system includes a high-frequency current acquisition channel and a capacitance acquisition channel, wherein the high-frequency current acquisition channel is connected to the cable grounding signal of the cable under test, and the capacitance acquisition channel is connected to the cable grounding signal of the cable under test. The device includes: The basic data acquisition module is used to acquire high-frequency current acquisition data of the cable under test based on the high-frequency current acquisition channel, and to acquire capacitance acquisition data of the cable under test based on the capacitance acquisition channel. The high-frequency current mixing data set acquisition module is used to repeatedly execute the high-frequency current mixing data acquisition step based on the preset high-frequency current local oscillator frequency, the pre-acquired high-frequency current local oscillator amplitude value and the high-frequency current acquisition data, until the high-frequency current local oscillator frequency is equal to the preset high-frequency current local oscillator frequency value, and obtain the high-frequency current mixing data set. The capacitor mixing data set acquisition module is used to repeatedly execute the capacitor mixing data acquisition steps based on the preset capacitor local oscillator frequency, the pre-acquired capacitor local oscillator amplitude value and the capacitor acquisition data, until the capacitor local oscillator frequency is equal to the preset capacitor local oscillator frequency value, and obtain the capacitor mixing data set. The target acquisition channel selection module is used to select a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the high-frequency current mixing data set, the high-frequency current amplitude value, the capacitance mixing data set, and the capacitance amplitude value, so as to acquire discharge information of the cable under test through the target acquisition channel; Specifically: each time a high-frequency current mixing data acquisition step is executed, a first sum of a preset first frequency value and the high-frequency current local oscillator frequency is acquired, and the first sum is used as the new high-frequency current local oscillator frequency; each time a capacitor mixing data acquisition step is executed, a second sum of a preset second frequency value and the capacitor local oscillator frequency is acquired, and the second sum is used as the new capacitor local oscillator frequency.

[0020] Another embodiment of the present invention provides a terminal device, including: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the steps of the cable discharge acquisition method of the present invention.

[0021] Another embodiment of the present invention also provides a computer-readable storage medium item, including: a stored computer program, which, when the computer program is running, controls the device where the computer-readable storage medium is located to perform the steps of a cable discharge acquisition method of the present invention. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic flowchart of a cable discharge acquisition method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a cable discharge acquisition device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an HFCT and capacitive sensor multiplexing acquisition system provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the gating decision circuit in an HFCT and capacitive sensor multiplexing acquisition system provided in an embodiment of the present invention; Icon labels: 1: High-frequency current acquisition channel; 2: Capacitance acquisition channel; 3: HFCT sensor; 4: Capacitance sensor; 5: Cable grounding wire; 6: Cable connector. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0031] See Figure 1 To address the aforementioned problems in the prior art and improve the detection efficiency during partial discharge, an embodiment of the present invention provides a cable discharge acquisition method applied to a dual-channel multiplexing acquisition system. The dual-channel multiplexing acquisition system includes a high-frequency current acquisition channel and a capacitance acquisition channel. The high-frequency current acquisition channel is connected to the cable grounding signal of the cable under test, and the capacitance acquisition channel is connected to the cable grounding signal of the cable under test. The method includes: Step S1: Acquire high-frequency current acquisition data of the cable under test based on the high-frequency current acquisition channel, and acquire capacitance acquisition data of the cable under test based on the capacitance acquisition channel; Step S2: Based on the preset high-frequency current local oscillator frequency, the pre-acquired high-frequency current local oscillator amplitude value, and the high-frequency current acquisition data, repeat the high-frequency current mixing data acquisition step until the high-frequency current local oscillator frequency is equal to the preset high-frequency current local oscillator frequency value, and obtain the high-frequency current mixing data set. Step S3: Based on the preset capacitor local oscillator frequency, the pre-acquired capacitor local oscillator amplitude value and capacitor acquisition data, repeat the capacitor mixing data acquisition step until the capacitor local oscillator frequency is equal to the preset capacitor local oscillator frequency value, and obtain the capacitor mixing data set. Step S4: Based on the high-frequency current mixing data set, the high-frequency current amplitude value, the capacitor mixing data set, and the capacitor amplitude value, select a target acquisition channel from the high-frequency current acquisition channel and the capacitor acquisition channel to collect discharge information of the cable under test through the target acquisition channel; Specifically: each time a high-frequency current mixing data acquisition step is executed, a first sum of a preset first frequency value and the high-frequency current local oscillator frequency is acquired, and the first sum is used as the new high-frequency current local oscillator frequency; each time a capacitor mixing data acquisition step is executed, a second sum of a preset second frequency value and the capacitor local oscillator frequency is acquired, and the second sum is used as the new capacitor local oscillator frequency.

[0032] In the above scheme, by acquiring high-frequency current acquisition data and capacitance acquisition data separately, and combining the high-frequency current local oscillator frequency updated repeatedly based on a preset first frequency value and the capacitance local oscillator frequency updated repeatedly based on a preset second frequency value, the high-frequency current mixing data set and capacitance mixing data set of the two channels are accurately detected. This enables effective evaluation of the distribution of high-frequency current acquisition data and capacitance acquisition data in their respective effective frequency bands. This allows for accurate determination of whether the discharge information of the cable under test is mainly concentrated in low or high frequencies. Furthermore, the acquisition channel selection is completed through the high-frequency current mixing data set, the high-frequency current local oscillator amplitude value, the capacitance mixing data set, and the capacitance local oscillator amplitude value, effectively selecting a more reliable target acquisition channel. The traditional dual-channel parallel processing architecture is optimized into a single-channel gating acquisition mode. While ensuring wide bandwidth coverage, the amount of data processed in the subsequent processing is significantly reduced, and the data processing efficiency of cable partial discharge detection is significantly improved.

[0033] It should be noted that the preset first frequency value and the preset second frequency value are selected according to specific needs. If the accuracy of target acquisition channel selection is to be improved, the preset first frequency value and the preset second frequency value should be smaller; if the efficiency of target acquisition channel selection is to be improved, the preset first frequency value and the preset second frequency value should be larger. Preferably, the preset first frequency value is 1MHz, and the preset second frequency value is also preferably 1MHz. For example, the high-frequency current local oscillator frequency is initialized to 1MHz, where the preset high-frequency current local oscillator frequency is 50MHz. In the process of obtaining the first sum of the preset first frequency value and the high-frequency current local oscillator frequency, and using this first sum as the new high-frequency current local oscillator frequency, it is preferred to update in steps of 1MHz with a period of 20ms to complete a complete scan from the initialized high-frequency current local oscillator frequency to the preset high-frequency current local oscillator frequency value. The high-frequency current local oscillator frequency scans from 1MHz to 50MHz, with a total scan time of 1 second. Similarly, for example, the capacitor local oscillator frequency is initialized to 51MHz, wherein the preset capacitor local oscillator frequency value is 100MHz. In the process of obtaining the second sum of the preset second frequency value and the capacitor local oscillator frequency, and using the second sum as the new capacitor local oscillator frequency, it is preferable to update the frequency with a gradient of 1MHz and a period of 20ms to complete a full scan from the initialized capacitor local oscillator frequency to the preset capacitor local oscillator frequency value. The capacitor local oscillator frequency is scanned from 50MHz to 100MHz, and the total scan time is 1 second.

[0034] In another embodiment, the high-frequency current mixing data acquisition step is repeatedly executed based on the preset high-frequency current local oscillator frequency, the pre-acquired high-frequency current local oscillator amplitude value, and the high-frequency current acquisition data, until the high-frequency current local oscillator frequency equals the preset high-frequency current local oscillator frequency value, to obtain the high-frequency current mixing data set. The high-frequency current mixing data acquisition step includes: The high-frequency current local oscillator signal is obtained based on the high-frequency current local oscillator frequency and the high-frequency current local amplitude value. High-frequency current mixing data is obtained based on the high-frequency current local oscillator signal and the high-frequency current acquisition data.

[0035] It should be noted that, based on the high-frequency current local oscillator frequency and the high-frequency current local amplitude, a high-frequency current local oscillator signal is obtained. The high-frequency current mixed data is obtained by multiplying the two analog signals, the high-frequency current local oscillator signal and the high-frequency current acquisition data, through a mixer. The mixer performs analog multiplication on the continuously acquired high-frequency current acquisition data (i.e., the HFCT sensor signal) and the high-frequency current local oscillator signal generated by combining the continuously updated high-frequency current local oscillator frequency (1-50MHz) with the high-frequency current local oscillator amplitude value. By updating the high-frequency current local oscillator frequency sequentially with a step size of 1MHz and a period of 20ms, the mixer essentially completes a point-by-point scan of the discrete frequency points of the high-frequency current acquisition data within its respective covered frequency band. Each scan point corresponds to one mixing operation, outputting high-frequency current mixed data containing sum frequency components and difference frequency components, and finally obtaining a high-frequency current mixed data set.

[0036] Understandably, for step S3: based on the preset capacitor local oscillator frequency, the pre-acquired capacitor local oscillator amplitude value, and the capacitor acquisition data, the capacitor mixing data acquisition step is repeatedly executed until the capacitor local oscillator frequency equals the preset capacitor local oscillator frequency value, thus obtaining the capacitor mixing data set. Specifically: A similar process is used, initializing the capacitor local oscillator frequency to 50MHz. Based on this frequency and the pre-acquired amplitude value, the capacitor local oscillator signal is obtained. The capacitor local oscillator signal and the capacitor acquisition data are then multiplied using another mixer to obtain the capacitor mixed data. The preset capacitor local oscillator frequency is 100MHz.

[0037] The capacitor local oscillator frequency is updated based on a preset second frequency value, preferably in steps of 1MHz and 20ms, to complete a full scan from the initial capacitor local oscillator frequency to the preset value. The capacitor local oscillator frequency is scanned from 51MHz to 100MHz, with a total scan time of 1 second. Similarly, the mixer performs analog multiplication on the continuously acquired capacitor acquisition data (i.e., the capacitor sensor signal) and the capacitor local oscillator signal generated by combining the constantly updated capacitor local oscillator frequency (51-100MHz) with the capacitor local oscillator amplitude value. By updating the capacitor local oscillator frequency sequentially in steps of 1MHz and 20ms, the mixer essentially completes a point-by-point scan of discrete frequency points within its respective covered frequency band for the capacitor acquisition data. Each scan point corresponds to one mixing operation, outputting capacitor mixed data containing sum and difference frequency components, ultimately yielding a capacitor mixed data set.

[0038] In another embodiment, obtaining the high-frequency current local oscillator signal based on the high-frequency current local oscillator frequency and the high-frequency current local amplitude includes: The data sensing time for acquiring the high-frequency current acquisition data; The high-frequency current local oscillator frequency and the data sensing time are cosine processed to obtain the high-frequency current local oscillator cosine value. The high-frequency current local oscillator signal is obtained by multiplying the cosine value of the high-frequency current local oscillator and the amplitude value of the high-frequency current local oscillator.

[0039] It should be noted that the data sensing time (t) is a continuous analog time variable used to characterize the time-domain signal, and the high-frequency current local oscillator signal ( The mathematical expression for ) is ,in This refers to the amplitude value of the high-frequency current. The local oscillator frequency of the high-frequency current in the current cycle is given by the cosine value of the local oscillator frequency. Similarly, the capacitor's local oscillator signal ( The expression for ) is By generating continuous high-frequency current local oscillator frequency and capacitor local oscillator frequency, continuous high-frequency current local oscillator signal and capacitor local oscillator signal are obtained, which ensures real-time and accurate analog mixing with high-frequency current acquisition data (i.e., HFCT sensor signal) and capacitor acquisition data (i.e., capacitor sensor signal), respectively.

[0040] In another embodiment, the step of selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the high-frequency current mixing data set, the high-frequency current amplitude value, the capacitance mixing data set, and the capacitance amplitude value, so as to acquire discharge information of the cable under test through the target acquisition channel, includes: Based on the high-frequency current mixing data set and the high-frequency current amplitude value, a high-frequency current amplitude set is obtained; Select the high-frequency current amplitude with the largest value from the set of high-frequency current amplitudes as the target high-frequency current amplitude; Based on the capacitor mixing data set and the capacitor amplitude value, a capacitor amplitude set is obtained; Select the capacitance value with the largest value from the set of capacitance values ​​as the target capacitance value; Based on the target high-frequency current amplitude and the target capacitance amplitude, a target acquisition channel is selected from the high-frequency current acquisition channel and the capacitance acquisition channel to acquire discharge information of the cable under test through the target acquisition channel.

[0041] It should be noted that the high-frequency current amplitude set reflects the energy distribution of the partial discharge signal in the 1-50MHz low-frequency band, and the capacitance amplitude set reflects the energy distribution of the signal in the 51-100MHz high-frequency band. By comparing the maximum amplitudes of the two frequency bands (i.e., the target high-frequency current amplitude and the target capacitance amplitude), the frequency band where the signal energy is mainly concentrated can be determined, thereby selecting the most suitable target acquisition channel for acquiring the current discharge type. The selected target acquisition channel is connected to a subsequent single high-speed sampling module via a single-pole double-throw analog gating switch for in-depth acquisition and analysis of discharge information.

[0042] In another embodiment, obtaining a high-frequency current amplitude set based on the high-frequency current mixing data set and the high-frequency current local amplitude value includes: The high-frequency current mixing data set is subjected to low-pass filtering to obtain a high-frequency current filtered mixing data set; Based on the high-frequency current filtering mixing data set, determine the high-frequency current filtering mixing amplitude set; Based on the high-frequency current filtering mixing amplitude set and the high-frequency current local amplitude value, a high-frequency current amplitude set is obtained.

[0043] It should be noted that the purpose of the low-pass filtering is to filter out the high-frequency components of the sum frequency output of the mixer, retaining the low-frequency components of the difference frequency. The high-frequency current-filtered mixing data set is a continuous analog signal after low-pass filtering. This high-frequency current-filtered mixing data set is then sampled by a low-speed sampling module with a sampling rate of 5 MSa / s. The low-speed sampling module can use an existing AD9280 chip to achieve a sampling rate below 30 MSa / s. The step of performing low-pass filtering on the high-frequency current-filtered mixing data set to obtain the high-frequency current-filtered mixing data set; and determining the high-frequency current-filtered mixing amplitude set based on the high-frequency current-filtered mixing data set, specifically: given the high-frequency current local oscillator signal (… The mathematical expression for ) is ,in, This refers to the amplitude value of the high-frequency current. The high-frequency current acquisition data is... High-frequency current acquisition data and high-frequency current amplitude High-frequency current frequency There is a mathematical expression between the data sensing time t and the time t. However, currently only high-frequency current acquisition data is known, i.e. The value is determined, and the final solution requires obtaining the high-frequency current amplitude. The value of is determined by the analog multiplication operation performed between the high-frequency current acquisition data and the high-frequency current local oscillator signal in the mixer to obtain the high-frequency current mixed data. ,in, The initial preset mixing coefficients are used. Combining the mathematical expressions for the high-frequency current local oscillator signal and the high-frequency current acquisition data, expanding the formula yields: ; Will As ,Will As Combining with existing formulas for product-to-sum conversion of cosine functions: The following formula is obtained: ; in, for , These are the final preset mixing coefficients. Wherein, Using absolute values ​​is to ensure that the frequency is positive and does not affect the final high-frequency current amplitude.

[0044] It is understandable that high-frequency current mixing data includes sum-frequency components and difference-frequency components, where the sum-frequency component is... The frequency is It belongs to the high frequency range. The difference frequency component is... The frequency is It belongs to low frequency.

[0045] The high-frequency current mixing data set is subjected to low-pass filtering to filter out high frequencies and retain low frequencies, resulting in a high-frequency current filtering mixing data set after removing high-frequency sum frequency components. What is understandable is that amplitude refers to the maximum absolute value of alternating current instantaneously within a cycle. Therefore, combining the expression for the high-frequency current filter mixing data set, we can determine the high-frequency current filter mixing amplitude set. The value of is Then, a low-speed sampling module of 5 MSa / s was used to acquire the filtered high-frequency current-filtered mixing data set, and the values ​​of its high-frequency current-filtered mixing amplitude set were detected, thus obtaining... The value of is obtained. The value of is then determined. Subsequently, based on the high-frequency current filter mixing amplitude set and the high-frequency current local amplitude value, the high-frequency current amplitude set is obtained.

[0046] Furthermore, it is understandable that the same steps as described above are used for the data acquisition channel of the capacitance acquisition channel, specifically: The capacitor local oscillator signal is known ( The mathematical expression for ) is ,in, This refers to the amplitude value of the capacitor. The capacitor data acquisition data is... Capacitor acquisition data and high-frequency capacitor amplitude capacitor frequency There is a mathematical expression between the data sensing time t and the time t. However, currently we only know about capacitance data acquisition, i.e. The value is determined, and the final solution requires obtaining the capacitance amplitude. The value of is determined because the capacitor acquisition data and the capacitor local oscillator signal undergo analog multiplication in another mixer to obtain the capacitor mixing data: ,in, For the initial preset mixing coefficients of another mixer, it's understandable that K represents the gain coefficient of the mixer, which varies slightly between different mixers. and The value of is determined based on the actual mixer used. Combining the mathematical expressions for the capacitor's local oscillator signal and the capacitor's acquired data, expanding the formula yields: ; Combining the existing formulas for product-to-sum conversion of cosine functions, we obtain the following formula: ; in, for , This is the final preset mixing coefficient for another mixer.

[0047] Then, low-pass filtering and low-speed sampling are performed using the same process to obtain the set of capacitor-filtered mixing amplitudes. To obtain the value, that is, to get The value of .

[0048] In summary, it can be seen that the signal amplitude of the high-frequency current filtered mixed data set obtained after filtering by two low-pass filters is closely related to the high-frequency current amplitude set of the high-frequency current acquisition data from the HFCT sensor. Similarly, the signal amplitude of the capacitor filtered mixed data set is closely related to the capacitance amplitude set of the capacitance acquisition data from the capacitance sensor, thus preserving the amplitude information in the input signal. The filtered high-frequency current filtered mixed data set and the capacitor filtered mixed data set are then fed into a low-speed sampling module with a sampling rate of 5 MSa / s to detect the maximum amplitude of the signal within the HFCT sensor and the capacitance sensor. The detection time for one set is 50 LO cycles, each cycle being 20 ms, for a total duration of 1 second. That is, this gating decision circuit can complete the amplitude detection of both types of sensors within 1 second and transmit the amplitude to the subsequent logic control unit.

[0049] In another embodiment, obtaining the high-frequency current amplitude set based on the high-frequency current filtered mixing amplitude set and the high-frequency current local oscillator amplitude value includes: The high-frequency current product value is obtained by multiplying the amplitude value of the high-frequency current with the preset mixing coefficient. The high-frequency current amplitude set is obtained based on the ratio of the high-frequency current filter mixing amplitude set to the high-frequency current product value.

[0050] It should be noted that this is based on the amplitude value of the high-frequency current. With preset mixing coefficients The product of these two factors yields the product value of the high-frequency current. Then, based on the ratio of the high-frequency current filter mixing amplitude set to the high-frequency current product value, the high-frequency current amplitude set is obtained. = / ( ),in and All are known fixed values, therefore, through = / ( This yielded a set of high-frequency current amplitudes. Throughout the process, because It is an intermediate signal that is naturally generated during the mixing process. It does not need to be actively calculated. Instead, the amplitude of its difference frequency component is obtained through filtering and sampling, and then the result is calculated in reverse. It is understandable that the same principle applies to obtaining the set of capacitor amplitude values: obtaining the amplitude value of the capacitor itself. With the preset mixing coefficients of another mixer The product of these two values ​​yields the capacitance product value. Then, the ratio of the set of capacitor-filtered mixing amplitudes to the product of the capacitance values ​​is obtained to get the set of capacitor amplitudes. = / ( ),in and All are known fixed values, therefore, through = / ( This yielded the set of capacitance amplitudes. .

[0051] In another embodiment, the step of selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the target high-frequency current amplitude and the target capacitance amplitude, so as to acquire discharge information of the cable under test through the target acquisition channel, includes: The target high-frequency current amplitude and the target capacitance amplitude are compared. When the target high-frequency current amplitude is greater than the target capacitance amplitude, the high-frequency current acquisition channel is used as the target acquisition channel. When the amplitude of the target high-frequency current is less than the amplitude of the target capacitance, the capacitance acquisition channel is used as the target acquisition channel.

[0052] It should be noted that the target high-frequency current amplitude and the target capacitance amplitude are compared to obtain a comparison result. Based on this result, a target acquisition channel is selected. Furthermore, this comparison and selection process can be executed by a logic control unit. The logic control unit receives the target high-frequency current amplitude and the target capacitance amplitude from the low-speed sampling module, compares them, and generates a digital control signal based on the comparison result: when the target high-frequency current amplitude is greater than the target capacitance amplitude, the high-frequency current acquisition channel is selected as the target acquisition channel; when the target high-frequency current amplitude is less than the target capacitance amplitude, the capacitance acquisition channel is selected as the target acquisition channel. This digital control signal drives the single-pole double-throw analog gating switch to physically connect the corresponding high-frequency current acquisition channel or capacitance acquisition channel to the subsequent single high-speed sampling module. This achieves adaptive gating of the sensor, ensuring that high-speed sampling resources are used to acquire the discharge signal with the most concentrated energy and optimal signal-to-noise ratio, thereby improving the detection efficiency during partial discharge.

[0053] Furthermore, in another embodiment, a cable discharge acquisition method is applied to an HFCT and capacitance sensor multiplexing acquisition system, referencing... Figure 3The HFCT and capacitance sensor 4 multiplexing acquisition system includes a first aluminum sheath, a second aluminum sheath, a first cable, a second cable, a cable connector 6, an HFCT sensor 3, a capacitance sensor 4, a cable grounding wire 5, a gating decision cable, a gating switch, a single-channel high-speed acquisition device, and a dual-channel multiplexing acquisition system. The first aluminum sheath serves as the outer sheath of the first cable, protecting it from environmental damage; the second aluminum sheath serves as the outer sheath of the second cable, protecting it from environmental damage. One end of the first cable is connected to one end of the cable connector 6, and the other end of the cable connector 6 is connected to one end of the second cable. The first cable is equipped with a cable grounding wire 5, which is connected to the HFCT sensor 3 and the capacitance sensor 4 respectively. The HFCT sensor 3 is connected to the high-frequency current acquisition channel 1, and the capacitance sensor 4 is connected to the capacitance acquisition channel 2. The first output terminal of the high-frequency current acquisition channel 1 is connected to the first input terminal of the gating decision circuit, and the first output terminal of the capacitance acquisition channel 2 is connected to the second input terminal of the gating decision circuit. The second output terminal of the high-frequency current acquisition channel 1 is connected to the first input terminal of the gating switch, and the second output terminal of the capacitance acquisition channel 2 is connected to the second input terminal of the gating switch. The output terminal of the gating decision circuit is connected to the third input terminal of the gating switch, and the output terminal of the gating switch is connected to the input terminal of a high-speed acquisition device. When partial discharge occurs in the first cable, the generated high-frequency pulse current signal will be transmitted along the first cable. When the signal reaches the cable joint 6, it will be transmitted to the next section of the cable, namely the second cable, via the grounding wire of the first cable. Therefore, the sensors used for partial discharge detection are all installed on the cable grounding wire 5. Figure 3 In this process, a high-frequency current sensor (HFCT) and a capacitance sensor 4 are respectively installed on the cable connection wires of the first cable to collect partial discharge signals within the first cable. Specifically, the cable grounding wires 5 of the first cable are cross-connected at their respective locations. The signals on the grounding network are then transmitted along this cross-connection structure to the grounding layer of the other cable (i.e., the second cable). Specifically, the cross-connection structure refers to the cross-connection of the metal sheath grounding layers of each phase cable; that is, the sheath grounding layer of phase A is connected to the sheath grounding layer of phase B, and the sheath grounding layer of phase B is connected to the sheath grounding layer of phase C. (Reference) Figure 3The high-frequency current acquisition channel 1 is connected to a high-frequency current sensor (HFCT), and the capacitance acquisition channel 2 is connected to a capacitance sensor 4. Both types of sensors are installed on the cable grounding wire 5 to sense the high-frequency pulse current signal generated by partial discharge. These two types of sensors have different frequency response ranges, which are complementary: the upper limit of the response frequency of the high-frequency current sensor (HFCT) is generally around 50MHz, while the capacitance sensor 4 can detect signals in the 50MHz and higher frequency bands. Therefore, complete coverage of signals within 100MHz can be achieved, jointly covering the target frequency band. The efficiency of partial discharge detection is improved by introducing a gating decision circuit and a gating switch within the system. The gating switch is a digitally controlled single-pole double-throw analog switch, which can be connected to the target acquisition channel (i.e., high-frequency current acquisition channel 1 or capacitance acquisition channel 2) through digital signal control. This switch can achieve attenuated transmission of analog signals within the 0-100MHz range, and then connect it to a high-speed acquisition device. The method executed internally by the gating decision circuit is as described in the cable discharge acquisition method of this invention.

[0054] refer to Figure 4 The selection decision circuit specifically includes a first mixer, a second mixer, a first low-pass filter, a second low-pass filter, a two-channel low-speed acquisition device, and a logic control unit, wherein the low-pass filter is preferably a 2MHz low-pass filter. The first output terminal of the high-frequency current acquisition channel 1 is connected to the first mixer, and the other end of the first mixer is connected to the first low-pass filter. The first output terminal of the capacitor acquisition channel 2 is connected to one end of the second mixer, and the other end of the second mixer is connected to the second low-pass filter. The other end of the first low-pass filter is connected to the first input terminal of the two-channel low-speed acquisition device, and the other end of the second low-pass filter is connected to the second input terminal of the two-channel low-speed acquisition device. The output terminal of the two-channel low-speed acquisition device is connected to the logic control unit. Understandably, this design relies on a cable discharge acquisition method executed by the gating decision circuit to improve the detection efficiency during partial discharge. In addition, without a gating switch and gating decision circuit, the signals from two sensors need to be sampled simultaneously, which leads to the need for a more expensive two-channel high-speed acquisition device. Furthermore, the two channels of the two-channel high-speed acquisition device need to operate simultaneously, resulting in higher system power consumption. In contrast, this solution, after selecting the target acquisition channel, only needs to use a lower-cost one-channel high-speed acquisition device. The operation of the one-channel high-speed acquisition device also results in lower system power consumption.

[0055] like Figure 2 As shown, based on the above method embodiments, corresponding apparatus embodiments are provided; An embodiment of the present invention provides a cable discharge acquisition device applied to a dual-channel multiplexing acquisition system. The dual-channel multiplexing acquisition system includes a high-frequency current acquisition channel and a capacitance acquisition channel. The high-frequency current acquisition channel is connected to the cable grounding signal of the cable under test, and the capacitance acquisition channel is connected to the cable grounding signal of the cable under test. The device includes: The basic data acquisition module is used to acquire high-frequency current acquisition data of the cable under test based on the high-frequency current acquisition channel, and to acquire capacitance acquisition data of the cable under test based on the capacitance acquisition channel. The high-frequency current mixing data set acquisition module is used to repeatedly execute the high-frequency current mixing data acquisition step based on the preset high-frequency current local oscillator frequency, the pre-acquired high-frequency current local oscillator amplitude value and the high-frequency current acquisition data, until the high-frequency current local oscillator frequency is equal to the preset high-frequency current local oscillator frequency value, and obtain the high-frequency current mixing data set. The capacitor mixing data set acquisition module is used to repeatedly execute the capacitor mixing data acquisition steps based on the preset capacitor local oscillator frequency, the pre-acquired capacitor local oscillator amplitude value and the capacitor acquisition data, until the capacitor local oscillator frequency is equal to the preset capacitor local oscillator frequency value, and obtain the capacitor mixing data set. The target acquisition channel selection module is used to select a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the high-frequency current mixing data set, the high-frequency current amplitude value, the capacitance mixing data set, and the capacitance amplitude value, so as to acquire discharge information of the cable under test through the target acquisition channel; Specifically: each time a high-frequency current mixing data acquisition step is executed, a first sum of a preset first frequency value and the high-frequency current local oscillator frequency is acquired, and the first sum is used as the new high-frequency current local oscillator frequency; each time a capacitor mixing data acquisition step is executed, a second sum of a preset second frequency value and the capacitor local oscillator frequency is acquired, and the second sum is used as the new capacitor local oscillator frequency.

[0056] It is understood that the above-described device embodiments correspond to the method embodiments of the present invention, and can implement the cable discharge acquisition method provided by any of the above-described method embodiments of the present invention.

[0057] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can specifically be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0058] Based on the above-described embodiment of the cable discharge acquisition method, another embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a cable discharge acquisition method according to any embodiment of the present invention.

[0059] For example, in this embodiment, the computer program can be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the terminal device.

[0060] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0061] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0062] Based on the above-described method embodiments, another embodiment of the present invention provides a computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute a cable discharge acquisition method as described in any of the above-described method embodiments of the present invention.

[0063] The modules / units integrated in the device / terminal equipment, if implemented as software functional units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0064] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for collecting cable discharge, characterized in that, An application is made in a dual-channel multiplexing acquisition system, which includes a high-frequency current acquisition channel and a capacitance acquisition channel. The high-frequency current acquisition channel is connected to the cable grounding signal of the cable under test, and the capacitance acquisition channel is connected to the cable grounding signal of the cable under test. The method includes: The high-frequency current acquisition data of the cable under test is obtained based on the high-frequency current acquisition channel, and the capacitance acquisition data of the cable under test is obtained based on the capacitance acquisition channel. Based on the preset high-frequency current local oscillator frequency, the pre-acquired high-frequency current local oscillator amplitude value, and the high-frequency current acquisition data, the high-frequency current mixing data acquisition step is repeatedly executed until the high-frequency current local oscillator frequency is equal to the preset high-frequency current local oscillator frequency value, and a high-frequency current mixing data set is obtained. Based on the preset capacitor local oscillator frequency, the pre-acquired capacitor local oscillator amplitude value, and the capacitor acquisition data, the capacitor mixing data acquisition step is repeated until the capacitor local oscillator frequency is equal to the preset capacitor local oscillator frequency value, and a capacitor mixing data set is obtained. Based on the high-frequency current mixing data set, the high-frequency current amplitude value, the capacitor mixing data set, and the capacitor amplitude value, a target acquisition channel is selected from the high-frequency current acquisition channel and the capacitor acquisition channel to acquire discharge information of the cable under test through the target acquisition channel; Specifically: each time a high-frequency current mixing data acquisition step is executed, a first sum of a preset first frequency value and the high-frequency current local oscillator frequency is acquired, and the first sum is used as the new high-frequency current local oscillator frequency; each time a capacitor mixing data acquisition step is executed, a second sum of a preset second frequency value and the capacitor local oscillator frequency is acquired, and the second sum is used as the new capacitor local oscillator frequency.

2. The cable discharge acquisition method according to claim 1, characterized in that, The high-frequency current mixing data acquisition step is repeatedly executed based on the preset high-frequency current local oscillator frequency, the pre-acquired high-frequency current local oscillator amplitude value, and the high-frequency current acquisition data, until the high-frequency current local oscillator frequency equals the preset high-frequency current local oscillator frequency value, to obtain the high-frequency current mixing data set. The high-frequency current mixing data acquisition step includes: The high-frequency current local oscillator signal is obtained based on the high-frequency current local oscillator frequency and the high-frequency current local amplitude value. High-frequency current mixing data is obtained based on the high-frequency current local oscillator signal and the high-frequency current acquisition data.

3. The cable discharge acquisition method according to claim 2, characterized in that, The process of obtaining the high-frequency current local oscillator signal based on the high-frequency current local oscillator frequency and the high-frequency current local amplitude includes: The data sensing time for acquiring the high-frequency current acquisition data; The high-frequency current local oscillator frequency and the data sensing time are cosine processed to obtain the high-frequency current local oscillator cosine value. The high-frequency current local oscillator signal is obtained by multiplying the cosine value of the high-frequency current local oscillator and the amplitude value of the high-frequency current local oscillator.

4. The cable discharge acquisition method according to claim 1, characterized in that, The step of selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the high-frequency current mixing data set, the high-frequency current amplitude value, the capacitance mixing data set, and the capacitance amplitude value, to acquire discharge information of the cable under test through the target acquisition channel, includes: Based on the high-frequency current mixing data set and the high-frequency current amplitude value, a high-frequency current amplitude set is obtained; Select the high-frequency current amplitude with the largest value from the set of high-frequency current amplitudes as the target high-frequency current amplitude; Based on the capacitor mixing data set and the capacitor amplitude value, a capacitor amplitude set is obtained; Select the capacitance value with the largest value from the set of capacitance values ​​as the target capacitance value; Based on the target high-frequency current amplitude and the target capacitance amplitude, a target acquisition channel is selected from the high-frequency current acquisition channel and the capacitance acquisition channel to acquire discharge information of the cable under test through the target acquisition channel.

5. The cable discharge acquisition method according to claim 4, characterized in that, The process of obtaining a high-frequency current amplitude set based on the high-frequency current mixing data set and the high-frequency current local amplitude value includes: The high-frequency current mixing data set is subjected to low-pass filtering to obtain a high-frequency current filtered mixing data set; Based on the high-frequency current filtering mixing data set, determine the high-frequency current filtering mixing amplitude set; Based on the high-frequency current filtering mixing amplitude set and the high-frequency current local amplitude value, a high-frequency current amplitude set is obtained.

6. The cable discharge acquisition method according to claim 5, characterized in that, The process of obtaining a high-frequency current amplitude set based on the high-frequency current filtered mixing amplitude set and the high-frequency current local oscillator amplitude value includes: The high-frequency current product value is obtained by multiplying the amplitude value of the high-frequency current with the preset mixing coefficient. The high-frequency current amplitude set is obtained based on the ratio of the high-frequency current filter mixing amplitude set to the high-frequency current product value.

7. The cable discharge acquisition method according to claim 4, characterized in that, The step of selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the target high-frequency current amplitude and the target capacitance amplitude, so as to acquire discharge information of the cable under test through the target acquisition channel, includes: The target high-frequency current amplitude and the target capacitance amplitude are compared. When the target high-frequency current amplitude is greater than the target capacitance amplitude, the high-frequency current acquisition channel is used as the target acquisition channel. When the amplitude of the target high-frequency current is less than the amplitude of the target capacitance, the capacitance acquisition channel is used as the target acquisition channel.

8. A cable discharge acquisition device, characterized in that, An application is made in a dual-channel multiplexing acquisition system, which includes a high-frequency current acquisition channel and a capacitance acquisition channel. The high-frequency current acquisition channel is connected to the cable grounding signal of the cable under test, and the capacitance acquisition channel is connected to the cable grounding signal of the cable under test. The device includes: The basic data acquisition module is used to acquire high-frequency current acquisition data of the cable under test based on the high-frequency current acquisition channel, and to acquire capacitance acquisition data of the cable under test based on the capacitance acquisition channel. The high-frequency current mixing data set acquisition module is used to repeatedly execute the high-frequency current mixing data acquisition step based on the preset high-frequency current local oscillator frequency, the pre-acquired high-frequency current local oscillator amplitude value and the high-frequency current acquisition data, until the high-frequency current local oscillator frequency is equal to the preset high-frequency current local oscillator frequency value, and obtain the high-frequency current mixing data set. The capacitor mixing data set acquisition module is used to repeatedly execute the capacitor mixing data acquisition steps based on the preset capacitor local oscillator frequency, the pre-acquired capacitor local oscillator amplitude value and the capacitor acquisition data, until the capacitor local oscillator frequency is equal to the preset capacitor local oscillator frequency value, and obtain the capacitor mixing data set. The target acquisition channel selection module is used to select a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the high-frequency current mixing data set, the high-frequency current amplitude value, the capacitance mixing data set, and the capacitance amplitude value, so as to acquire discharge information of the cable under test through the target acquisition channel; Specifically: each time a high-frequency current mixing data acquisition step is executed, a first sum of a preset first frequency value and the high-frequency current local oscillator frequency is acquired, and the first sum is used as the new high-frequency current local oscillator frequency; each time a capacitor mixing data acquisition step is executed, a second sum of a preset second frequency value and the capacitor local oscillator frequency is acquired, and the second sum is used as the new capacitor local oscillator frequency.

9. A terminal device, characterized in that, The device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements a cable discharge acquisition method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, include: A stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform a cable discharge acquisition method as described in any one of claims 1-7.

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