Anti-inductive impact cable GIS terminal vibration signal acquisition device and working method

Abstract

The embodiment of the invention discloses an anti-inductive impact cable GIS terminal vibration signal acquisition device and a working method, the device comprises a measurement module, a signal acquisition module, a signal acquisition module, a modal analysis module and a power supply input module, and the measurement module is connected with the signal acquisition module; the signal acquisition module is respectively connected with the signal acquisition module, the modal analysis module and the power supply input module; a vibration signal of a cable GIS terminal is captured through a measurement module, and after the vibration signal is amplified and filtered through a signal acquisition module, the processed signal is sent to a signal acquisition module for storage and a modal analysis module for analysis; and the modal analysis module performs modeling on the cable GIS terminal based on the vibration signal and analyzes the vibration modal change of the cable GIS terminal so as to judge whether a mechanical defect exists in the cable GIS terminal. By implementing the device provided by the embodiment of the invention, not only can the fault sensing capability of the cable GIS terminal be effectively improved, but also the operation and maintenance efficiency and safety of a power system can be remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, and particularly relates to a cable GIS terminal vibration signal acquisition device capable of preventing induction impact and a working method. BACKGROUND

[0002] During the operation of power equipment, the power equipment will generate vibration due to the influence of electric field force and ampere force generated by current. The vibration contains important information about mechanical defects such as changes in the internal structure of the equipment, so that vibration detection becomes an effective method for detecting defects of power equipment. In particular, the cable GIS (r gas insulated switchgear, Gas Insulated Switchgea) terminal, as a key component connecting the GIS device and the cable, plays a crucial role in the power transmission system. However, there is currently no vibration signal acquisition device designed specifically for the complex environment in which the cable GIS terminal is located on the market, which makes it difficult to detect faults in the cable GIS terminal in a timely manner, and maintenance and repair also face many difficulties.

[0003] The cable GIS terminal usually works in environments such as high-voltage test fields or substations, where not only the electromagnetic environment is complex, but also the voltage changes will produce induced high voltage. When the induced high voltage acts on the signal acquisition device, it will seriously affect the accuracy of signal acquisition, and may even damage internal components such as power supply. In order to overcome these problems, a new type of vibration signal acquisition device capable of resisting the influence of induced impact voltage is needed. As a parameter reflecting the vibration characteristics of an object itself, by establishing a model of the cable GIS terminal and marking the measurement points, the vibration data of the input points can be analyzed to obtain the vibration mode of the cable GIS terminal, and then reflect its internal mechanical defects. Changes in the internal structure of the cable GIS terminal will directly cause changes in the vibration mode, and by monitoring these changes, potential mechanical defects can be found.

[0004] Although existing technologies such as patents CN119766198A, CN119534969A and CN103091609A provide some electromagnetic interference protection measures, they do not solve the problem of the influence of induced impact voltage on the signal acquisition device. For example, patent CN119766198A introduces a filter control method and an anti-electromagnetic interference device, but does not mention specific measures to deal with induced impact voltage; patent CN119534969A describes an anti-electromagnetic interference current sensor circuit, but also ignores the influence of induced impact high voltage; and patent CN103091609A focuses on GIS partial discharge online monitoring, rather than vibration signal collection and analysis.

[0005] Therefore, it is necessary to design a new device to not only effectively improve the sensing ability of cable GIS terminal fault, but also significantly improve the operation efficiency and safety of the power system. SUMMARY

[0006] The present application aims to overcome the defects of the prior art and provide a cable GIS terminal vibration signal acquisition device and working method capable of preventing induction shock.

[0007] To solve the above technical problems, the present application aims to achieve the following technical solutions: a cable GIS terminal vibration signal acquisition device capable of preventing induction shock is provided, which comprises a measurement module, a signal acquisition module, a signal acquisition module, a modal analysis module and a power input module, the measurement module is connected with the signal acquisition module; the signal acquisition module is connected with the signal acquisition module, the modal analysis module and the power input module respectively; The vibration signal of the cable GIS terminal is captured by the measurement module, and after amplification and filtering processing by the signal acquisition module, the processed signal is simultaneously sent to the signal acquisition module for storage and the modal analysis module for analysis; the modal analysis module models the cable GIS terminal based on the vibration signal and analyzes the vibration modal change thereof, so as to determine whether there is a mechanical defect inside.

[0008] Further technical solutions are as follows: the signal acquisition module comprises a power input surge protection circuit, a signal input surge protection circuit, a signal processing module, a power module, a first interface and a second interface; the power input surge protection circuit is connected with the power module; the signal input surge protection circuit is connected with the signal processing module; the signal processing module is connected with the first interface; the signal processing module is connected with the second interface; the first interface is connected with the signal acquisition module; the second interface is connected with the modal analysis module; the power input module is connected with the power input surge protection circuit.

[0009] Further technical solutions are as follows: the power input surge protection circuit comprises a fuse, a voltage-dependent resistor, an LED indication branch and a transient suppression diode; the fuse is connected in series in the DC input circuit, the fuse is connected with the power module; one end of the voltage-dependent resistor is grounded, the other end of the voltage-dependent resistor is connected between the fuse and the power module; the LED indication branch is connected in parallel with the voltage-dependent resistor; one end of the transient suppression diode is connected between the fuse and the power module; the other end of the transient suppression diode is grounded.

[0010] Further technical solutions are as follows: the positive and negative poles of the DC input circuit are respectively connected with the power input surge protection circuit.

[0011] Further technical solutions are: the LED indication branch includes a diode, an indicator lamp and a current-limiting resistor; one end of the voltage-dependent resistor is connected with the direct current input circuit through a safety tube; the diode is connected in series with the indicator lamp; the indicator lamp is connected with one end of the current-limiting resistor; the other end of the current-limiting resistor is grounded.

[0012] Further technical solutions are: the signal input anti-surge protection circuit includes a transient suppression diode; one end of the transient suppression diode is grounded, and the other end of the transient suppression diode is connected with a signal interface; the signal interface is connected with the measurement module.

[0013] Further technical solutions are: the signal processing module includes an operational amplifier, and the operational amplifier is connected with the signal interface; the operational amplifier is also connected in parallel with a resistor and a capacitor.

[0014] Further technical solutions are: the signal processing module includes a filter, and the operational amplifier is connected with the filter; the filter is connected with the first interface.

[0015] Further technical solutions are: the filter includes a high-pass filter and a low-pass filter; the operational amplifier is connected with the high-pass filter; the high-pass filter is connected with the low-pass filter; and the low-pass filter is connected with the first interface.

[0016] The application further provides a working method of the cable GIS terminal vibration signal acquisition device against induction impact. The vibration signal of the cable GIS terminal is captured by the measurement module, and after being amplified and filtered by the signal acquisition module, the processed signal is simultaneously sent to the signal acquisition module for storage and the modal analysis module for analysis; the modal analysis module models the cable GIS terminal based on the vibration signal and analyzes the vibration modal change of the cable GIS terminal, so as to determine whether there is a mechanical defect inside.

[0017] Compared with the prior art, the present application has the beneficial effects that: the present application integrates the measurement module, the signal acquisition module, the signal acquisition module, the modal analysis module and the power input module, realizes the accurate capture, efficient processing and in-depth analysis of the cable GIS terminal vibration signal. Specifically, the measurement module is responsible for real-time monitoring of the vibration of the cable GIS terminal, and the signal acquisition module amplifies and filters the collected vibration signal, removes noise interference and improves signal quality. Then, the optimized vibration signal is transmitted to the signal acquisition module for storage and sent to the modal analysis module for in-depth analysis. The modal analysis module can accurately identify the potential mechanical defects inside the cable GIS terminal through detailed evaluation of the vibration modal change. This design not only significantly improves the accuracy and timeliness of fault detection, but also provides scientific basis and technical support for the operation and maintenance of the power system, thereby effectively improving the operation efficiency and safety of the power system. In summary, the device optimizes the signal processing process and introduces advanced modal analysis technology, realizes accurate monitoring and rapid response of the health status of the cable GIS terminal, and greatly enhances the reliability and efficiency of power system operation and maintenance.

[0018] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 A schematic block diagram of a cable GIS terminal vibration signal acquisition device for preventing induction impact is provided for the embodiments of the present application. Figure 2 A circuit principle diagram of a cable GIS terminal vibration signal acquisition device for preventing induction impact is provided for the embodiments of the present application. Explanation of symbols in the figure: 1, measurement module; 2, signal acquisition module; 3, signal acquisition module; 4, modal analysis module; 5, power input module. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] It should be understood that the terms "comprises" and "comprising," when used in this specification and accompanying claims, indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0023] It should also be understood that the terms used in the specification of the application herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0024] It should further be understood that the term "and / or" as used in the specification of the application and the appended claims is to be construed to mean either one or more of the associated listed items as well as all possible combinations of the items.

[0025] Power equipment vibrates due to electric field force and current-induced Ampere force during operation, and these vibrations contain important information about changes in the internal structure of the equipment, making vibration detection an effective method for defect detection. In particular, cable GIS terminals, as a key part connecting GIS equipment and cables, work in a complex electromagnetic environment, but there is currently a lack of specially designed vibration signal acquisition devices to deal with the threat of induced high-voltage to signal acquisition accuracy and device safety. By developing a new type of acquisition device that can resist the influence of induced impulse voltage, and using vibration modal analysis, internal mechanical defects of cable GIS terminals can be effectively monitored, although existing technologies provide certain electromagnetic interference protection measures, but do not solve the problem of induced impulse voltage; there is currently a lack of specialized circuit design for vibration signal acquisition devices for cable GIS terminals; existing devices do not consider the influence of induced impulse voltage that may occur in the application environment of cable GIS terminals; existing vibration signal acquisition devices cannot achieve synchronous data storage and modal analysis.

[0026] To this end, the embodiments of the present application also provide a cable GIS terminal vibration signal acquisition device that can effectively improve the perception of cable GIS terminal faults, and significantly improve the operation and maintenance efficiency and safety of the power system.

[0027] The anti-inductive shock cable GIS terminal vibration signal acquisition device integrates multiple modules such as measurement, signal acquisition, processing, acquisition and modal analysis, and specially designs a power input and signal input surge protection circuit to effectively resist the influence of inductive shock voltage on signal acquisition, ensuring data accuracy and equipment safety. It uses high-pass and low-pass filters for signal processing, and identifies changes in internal mechanical defects of the cable GIS terminal through modal analysis, thereby improving fault perception capability. In addition, the entire signal acquisition module is placed in a protective shell with shielding function, further enhancing the anti-interference performance, so that the operation and maintenance personnel can detect potential problems more timely and accurately, significantly improving the operation efficiency and operation safety of the power system.

[0028] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings in the specification and specific embodiments.

[0029] Please refer to Figure 1 An anti-inductive shock cable GIS terminal vibration signal acquisition device, comprising: a measurement module 1, a signal acquisition module 2, a signal acquisition module 3, a modal analysis module 4 and a power input module 5, the measurement module 1 is connected with the signal acquisition module 2; the signal acquisition module 2 is connected with the signal acquisition module 3, the modal analysis module 4 and the power input module 5 respectively; The vibration signal of the cable GIS terminal is captured by the measurement module 1, and after amplification and filtering processing by the signal acquisition module 2, the processed signal is sent to the signal acquisition module 3 for storage and the modal analysis module 4 for analysis at the same time; the modal analysis module 4 models the cable GIS terminal based on the vibration signal and analyzes the vibration modal change, so as to judge whether there is mechanical defect inside.

[0030] Specifically, the measurement module 1 is responsible for capturing the vibration signal generated by the cable GIS terminal, and transmits these signals to the signal acquisition module 2 through the shielded wire.

[0031] The signal acquisition module 2 receives the vibration signal from the measurement module 1, first passes through the transient suppression diode for surge protection, then is amplified by the operational amplifier, and is processed by the high-pass and low-pass filters to ensure the quality and accuracy of the signal. The processed signal is sent to the signal acquisition module 3 and the modal analysis module 4.

[0032] The signal acquisition module 3 stores the processed vibration signal for subsequent data analysis and reference.

[0033] The modal analysis module 4 analyzes the vibration modal of the cable GIS terminal using the collected vibration signal data after modeling the cable GIS terminal and setting the measurement point, so as to judge whether there is mechanical defect inside.

[0034] The power input module 5 provides stable DC power for the entire system, and a double protection circuit against induced impulse is set in the power input line, which includes a fuse tube, a voltage-dependent resistor and a transient suppression diode, effectively preventing the influence of induced impulse voltage caused by environmental high voltage changes on the system.

[0035] In addition, in order to facilitate the monitoring of the state of the voltage-dependent resistor, an LED branch is added between it and the fuse tube. When the voltage-dependent resistor is broken down, the LED goes out, prompting the user to replace the damaged component. This design not only improves the safety and reliability of the system, but also simplifies maintenance work. Overall, the device realizes effective collection, storage and analysis of the vibration signals of the cable GIS terminal, which helps to discover potential mechanical defects in a timely manner.

[0036] In an embodiment, referring to Figure 2 The signal collection module 2 described above includes a power input surge protection circuit, a signal input surge protection circuit, a signal processing module, a power module, a first interface and a second interface; the power input surge protection circuit is connected with the power module; the signal input surge protection circuit is connected with the signal processing module; the signal processing module is connected with the first interface; and the signal processing module is connected with the second interface.

[0037] The first interface is connected with the signal acquisition module 3; the second interface is connected with the modal analysis module 4; and the power input module 5 is connected with the power input surge protection circuit.

[0038] These components work together to ensure effective collection, processing and analysis of the vibration signals of the cable GIS terminal. The specific structure is as follows: Power input surge protection circuit: This circuit is set in the DC power input line, aiming to prevent induced impulse voltage caused by environmental high voltage changes from damaging the system. It is composed of a series of fuse tubes, a voltage-dependent resistor circuit (including an additional fuse tube to protect the voltage-dependent resistor), a transient suppression diode and an LED status indication branch. When excessive current or voltage occurs, the fuse tube will melt to protect the subsequent circuit, while the voltage-dependent resistor will absorb large energy surges, and the transient suppression diode will quickly respond to transient spikes to avoid damage to other components. The LED is used to display the working state of the voltage-dependent resistor, and once it goes out, it indicates that the voltage-dependent resistor may have been broken down.

[0039] Signal input surge protection circuit: In order to reduce the interference of components on the received signal strength and accuracy, only a transient suppression diode is used as a surge protection measure. This design ensures that even in the case of induced impulse, the impulse can be effectively introduced to the ground, thereby protecting the subsequent amplifiers and other sensitive components from damage.

[0040] Signal processing module: including operational amplifier, differential signal to single-ended signal conversion, high-pass filter and low-pass filter components. It is responsible for receiving the original vibration signal from the measurement module 1, and amplifying, filtering and other processing to improve the quality and accuracy of the signal.

[0041] Power module: stable DC power supply after the power input surge protection circuit to supply the entire system operation, including signal processing module and other parts that need power supply.

[0042] First interface and second interface: the processed signal is transmitted to the signal acquisition module 3 through the first interface for storage; at the same time, the same data is transmitted to the modal analysis module 4 through the second interface to further analyze the vibration modal of the cable GIS terminal and whether there is a mechanical defect inside.

[0043] Through this design, not only can effectively resist the high pressure impact in the environment, protect the safety and reliability of the equipment, but also can realize the real-time monitoring and analysis of the vibration of the cable GIS terminal, which helps to find and solve potential problems in time. In addition, the LED is used to intuitively display the state of the voltage-dependent resistor, which simplifies the maintenance process and improves the operability and maintenance efficiency of the system.

[0044] In an embodiment, referring to Figure 2 The power input surge protection circuit includes a fuse, a voltage-dependent resistor, an LED indication branch, and a transient suppression diode. The fuse is connected in series in the DC input circuit, and the fuse is connected to the power module. One end of the voltage-dependent resistor is grounded, and the other end of the voltage-dependent resistor is connected between the fuse and the power module. The LED indication branch is connected in parallel with the voltage-dependent resistor. One end of the transient suppression diode is connected between the fuse and the power module. The other end of the transient suppression diode is grounded.

[0045] In an embodiment, referring to Figure 2 The positive and negative poles of the DC input circuit are respectively connected with the power input surge protection circuit.

[0046] The circuit includes a fuse, a voltage-dependent resistor, an LED indication branch, and a transient suppression diode. Its design aims to effectively resist the induced impulse voltage caused by environmental high voltage changes, while providing simple visual indication to help users identify the working state of the circuit components.

[0047] The fuse is connected in series in the DC input circuit, located before the voltage-dependent resistor and the transient suppression diode. Its main role is to directly fuse when the current generated by the induced impulse is too large, thereby cutting off the subsequent circuit and preventing damage in a larger range.

[0048] The varistor is connected between the fuse and the power module. The varistor is a key component for absorbing large energy surges. It can significantly increase its resistance value when the voltage rises to share higher voltage, avoiding the failure of other circuit components due to high voltage. In normal working conditions, the varistor maintains high impedance, but when it encounters an overvoltage situation, it can quickly conduct and direct excess energy to ground.

[0049] The LED indication branch is connected in parallel with the varistor and contains an LED and a current-limiting resistor. When the varistor is in normal working condition, the LED will light up; once the varistor is broken down due to excessive voltage, the LED branch will be short-circuited, causing the LED to go out. This provides an intuitive way for users to understand the status of the varistor, so that it can be replaced in time.

[0050] The transient suppression diode is connected between the fuse and the power module, and the other end is grounded. The transient suppression diode is used to quickly respond to transient peak overvoltage and can effectively lead these peak voltages to ground, protecting subsequent electronic components from damage.

[0051] To ensure the stability and reliability of the system, the positive and negative poles of the DC input line are respectively equipped with the above-mentioned power input surge protection circuit. This configuration not only provides independent protection for each line, but also effectively reduces the potential risks caused by induced shocks.

[0052] Specifically: At the positive end, the power input surge protection circuit is composed of a fuse, a varistor, an LED indication branch, and a transient suppression diode, which are connected in sequence to form effective protection for the positive input.

[0053] At the negative end, a similar configuration is used to ensure the safety of the entire system, maintaining system stability even in the case of induced shocks.

[0054] In this way, the cable GIS terminal vibration signal acquisition device not only can operate stably in complex environments, but also can discover and handle potential problems in time through simple visual inspection, improving the reliability and maintenance efficiency of the system. In addition, combined with the application of the modal analysis module 4, it is possible to detect mechanical defects inside the cable GIS terminal, further improving the safety performance of the equipment.

[0055] In an embodiment, referring to Figure 2 The above-mentioned LED indication branch includes a diode, an indicator light, and a current-limiting resistor; one end of the varistor is connected to the DC input line through the fuse; the diode and the indicator light are connected in series; the indicator light is connected to one end of the current-limiting resistor; and the other end of the current-limiting resistor is grounded.

[0056] Specifically, the LED indication branch includes a diode, an indicator light, and a current-limiting resistor. It is designed to visually display the status of the pressure-sensitive resistor: One end of the pressure-sensitive resistor is connected to the DC input circuit through a fuse: This ensures that the fuse can be blown when the current is too large, protecting the subsequent circuit from damage.

[0057] The diode is connected in series with the indicator light: This combination is mainly used to prevent reverse current from damaging the LED and to ensure that the LED can be normally lit when the pressure-sensitive resistor is working properly.

[0058] The indicator light is connected to the current-limiting resistor: The role of the current-limiting resistor is to limit the current flowing through the LED, preventing the LED from being burned out due to excessive current.

[0059] The other end of the current-limiting resistor is grounded: It provides a safe current path, making the entire circuit more stable and safe.

[0060] In an embodiment, please refer to Figure 2 The above-mentioned signal input surge protection circuit includes a transient suppression diode; one end of the transient suppression diode is grounded, and the other end of the transient suppression diode is connected to the signal interface; the signal interface is connected to the measurement module 1.

[0061] In an embodiment, please refer to Figure 2 The above-mentioned signal processing module includes an operational amplifier, and the operational amplifier is connected to the signal interface; the operational amplifier is also connected in parallel with a resistor and a capacitor.

[0062] Specifically, the signal processing module is composed of an operational amplifier (OPA) and related elements, which is responsible for amplifying weak vibration signals and converting them into a form suitable for further analysis: The operational amplifier is connected to the signal interface: It directly receives signals from the signal input surge protection circuit.

[0063] The operational amplifier is also connected in parallel with a resistor and a capacitor: These elements are used to adjust the gain and frequency response of the amplifier to optimize signal quality.

[0064] In an embodiment, please refer to Figure 2 The above-mentioned signal processing module includes a filter, and the operational amplifier is connected to the filter; the filter is connected to the first interface.

[0065] In an embodiment, please refer to Figure 2 The above-mentioned filter includes a high-pass filter and a low-pass filter; the operational amplifier is connected to the high-pass filter; the high-pass filter is connected to the low-pass filter; and the low-pass filter is connected to the first interface.

[0066] In this embodiment, the filter module contains a high-pass filter (HPF) and a low-pass filter (LPF) to remove unwanted frequency components and retain useful vibration signals: The operational amplifier is connected to the high-pass filter: first remove the low-frequency noise in the signal.

[0067] The high-pass filter is connected to the low-pass filter: then remove the high-frequency interference, only retain the vibration signal within the target frequency band.

[0068] The low-pass filter is connected to the first interface: the finally processed signal is output to the signal acquisition module 3 and the modal analysis module 4 through the first interface.

[0069] This cable GIS terminal vibration signal acquisition device not only effectively protects the power input and signal input part from induced impulse voltage, but also can intuitively monitor the working state of the pressure-sensitive resistor through the LED indicating branch. At the same time, through accurate amplification and filtering processing of the collected vibration signal, combined with modal analysis technology, it can accurately detect whether there is mechanical defect inside the cable GIS terminal. This comprehensive design scheme greatly improves the reliability and practicality of the system, and provides strong technical support for the safe operation of the cable GIS terminal.

[0070] In an embodiment, please refer to Figure 2 The signal acquisition module 2 described above is located in a protective shell with shielding function.

[0071] In order to further improve the reliability and stability of the cable GIS terminal vibration signal acquisition device, the signal acquisition module 2 is designed to be located in a protective shell with shielding function. This design not only helps to prevent external electromagnetic interference from affecting signal acquisition, but also protects internal electronic components from physical damage and environmental factors (such as humidity, dust, etc.).

[0072] The protective shell is made of conductive material, which can effectively block external electromagnetic interference (EMI) and ensure high accuracy and stability during signal acquisition. The shielding layer can be a metal mesh or a conductive coating, and the appropriate material and structure are selected according to specific needs.

[0073] In addition to electromagnetic shielding, the protective shell should also have certain physical protection capabilities, such as waterproof and dustproof level reaching IP65 or above, to adapt to various complex working environments.

[0074] Considering that internal electronic components may generate heat during operation, the protective shell design needs to consider good heat dissipation performance. Heat dissipation fins, ventilation holes or the use of heat dissipation materials can be used to improve heat dissipation efficiency and ensure long-term stable operation of the equipment.

[0075] Although the protective shell provides strong protection, it also needs to be designed to facilitate maintenance and repair. For example, by setting detachable panels or quick connectors, users can replace components or troubleshoot without breaking the overall seal.

[0076] The signal input anti-surge protection circuit includes a transient voltage suppression diode (TVS) to prevent fast transient peak overvoltage from damaging subsequent circuits. These sensitive components are placed in a shielded housing, which can more effectively resist external electromagnetic interference and ensure normal operation.

[0077] The operational amplifier and filter module is responsible for amplifying weak vibration signals and removing unwanted frequency components. Since these operations require high signal purity, it is particularly important to place them in a shielded environment to significantly reduce the impact of external interference on signal processing quality.

[0078] The modal analysis module 4 interfaces with the pre-processed vibration signals transmitted through shielded wires to the modal analysis module 4, which is also located inside the protective shell to ensure that the data transmission path is as short as possible and is not affected by external factors, thereby improving the accuracy of the final analysis results.

[0079] In summary, placing the signal acquisition module 2 in a protective shell with shielding capabilities not only effectively improves the system's anti-interference ability and reliability, but also helps to extend the service life of the device and ensure stable operation for a long time. This design provides a solid foundation for the overall performance of the cable GIS terminal vibration signal acquisition device.

[0080] The device of the present embodiment aims to solve the problem of induced surge voltage caused by environmental high voltage changes, while also visually indicating the effectiveness of the surge protection circuit's LED to replace failed components in a timely manner. In addition, the device synchronously outputs the collected vibration signals to the signal acquisition module 3 and the modal analysis module 4, achieving data storage while performing real-time analysis of the vibration modal of the cable GIS terminal to determine whether there are mechanical defects inside.

[0081] Two anti-induction surge protection circuits are set up in the DC input line of the power supply module. First, a safety tube is connected in series, which quickly melts and cuts off the subsequent circuit when the induced surge current is too large. Then, an energy absorption circuit composed of a varistor is connected in parallel to withstand high-energy surges. Finally, a transient voltage suppression diode is connected in parallel to form a fast-response peak suppression path. The signal input circuit only retains a transient voltage suppression diode as an anti-surge element to avoid interference with signal accuracy caused by additional components.

[0082] In the anti-inductive shock circuit using the pressure sensitive resistor, a LED indicating branch circuit is introduced between the fuse tube and the pressure sensitive resistor, which is composed of a diode, a LED and a current limiting resistor. When the pressure sensitive resistor is broken down due to overvoltage, the LED branch circuit is bypassed, the originally always-on LED is extinguished, prompting the maintenance personnel to replace the damaged pressure sensitive resistor immediately.

[0083] The vibration signal is transmitted to the signal acquisition module 3 and the modal analysis module 4 after being collected and processed: the former is responsible for data storage, and the latter performs modal analysis using real-time vibration data after presetting the cable GIS model and the measuring point information, and identifies the mechanical defects inside the cable GIS terminal through the change of the vibration mode.

[0084] The signal acquisition device circuit of the anti-inductive shock includes: an anti-surge circuit of the signal input end, an operational amplifier, a differential-to-single-ended conversion circuit, a high-pass filter, a low-pass filter, a signal output end, an anti-surge circuit of the DC power input end, a collector power module and a shell shielding ground. The specific structure is shown in Figure 2 .

[0085] The DC power input end is arranged with double anti-inductive shock protection on the two DC bus lines before being connected to the power module. First, a fuse tube is connected in series, which is directly fused when the inductive shock current is too high, protecting the subsequent circuit; then, an anti-inductive shock branch circuit containing a pressure sensitive resistor is connected in parallel, and a fuse tube is connected in series in the branch circuit to prevent the pressure sensitive resistor from being burned out due to overcurrent; in this branch circuit, an indicating branch circuit composed of a diode, a LED and a current limiting resistor is introduced between the fuse tube and the pressure sensitive resistor, which is used to display whether the pressure sensitive resistor is in normal working state. The pressure sensitive resistor is a high-energy surge absorbing element, and its resistance decreases significantly with the increase of voltage, thereby sharing the overvoltage and protecting other elements. When the pressure sensitive resistor is not broken down, the LED branch circuit is not short-circuited, and the LED remains on; once the pressure sensitive resistor is broken down, the LED branch circuit is bypassed, the LED is extinguished, and it is prompted that the pressure sensitive resistor has failed. A transient suppression diode is also connected in parallel to the DC input line, which is used to quickly suppress transient peak overvoltage and further protect the subsequent elements. The power module protected by the above protection provides stable excitation for the entire acquisition device.

[0086] The signal input end only uses a transient suppression diode to form an anti-inductive shock circuit to avoid the influence of redundant elements on the signal strength and accuracy. When the shock comes, the transient suppression diode quickly conducts, leading the shock current to the ground wire to prevent the subsequent amplifier and other elements from being damaged. After the signal is amplified by the amplifier and converted into a single-ended signal, it is sequentially passed through a high-pass filter and a low-pass filter, and finally a pure vibration signal is output.

[0087] As Figure 1As shown, the measurement module 1 obtains the vibration signal of the cable GIS terminal, and sends it to the signal acquisition module 2 through the shielded wire. After the signal acquisition module 2 completes amplification, filtering and other processes, it is output to the signal acquisition module 3 and the modal analysis module 4 through the shielded wire again. The signal acquisition module 3 stores the vibration signal; the modal analysis module 4 performs vibration modal analysis on the real-time vibration data according to the pre-established cable GIS terminal model and measurement point information, and judges whether there is a mechanical defect inside the cable GIS terminal through the change of modal parameters. The entire system is powered by an external DC power supply.

[0088] In summary, different anti-inductive shock strategies are adopted at the power input and signal input ends: a voltage-dependent resistor and a transient suppression diode are configured at the power end to cope with high-energy surges and fast spikes, respectively; only the transient suppression diode is retained at the signal end to prevent signal attenuation or accuracy reduction caused by the introduction of components. An LED indicating branch is added to the voltage-dependent resistor protection circuit to intuitively display whether the voltage-dependent resistor is broken, facilitating timely replacement by maintenance personnel. The traditional acquisition device is limited to data display and storage, and the real-time vibration signal is sent to the modal analysis module 4 at the same time. Through the pre-established cable GIS terminal model and measurement point information, the vibration modal is calculated in real time, and the internal mechanical defect is judged according to the modal change to realize early detection and positioning of the defect.

[0089] The cable GIS terminal is not limited by specific voltage levels and equipment models. The voltage-dependent resistor and transient suppression diode used have no fixed model, as long as they meet the performance requirements. The remaining electronic components also have no fixed model, as long as they meet the functional requirements. The power input voltage and current are determined according to the actual operating power of the device, without special limitations.

[0090] The anti-induction impact cable GIS terminal vibration signal acquisition device described above realizes accurate capture, efficient processing and in-depth analysis of the vibration signal of the cable GIS terminal through the integration of the measurement module 1, the signal acquisition module 2, the signal acquisition module 3, the modal analysis module 4 and the power input module 5. Specifically, the measurement module 1 is responsible for real-time monitoring of the vibration of the cable GIS terminal, and the signal acquisition module 2 amplifies and filters the collected vibration signal, removes noise interference and improves signal quality. Subsequently, the optimized vibration signal is simultaneously transmitted to the signal acquisition module 3 for storage and sent to the modal analysis module 4 for in-depth analysis. The modal analysis module 4 can accurately identify potential mechanical defects inside the cable GIS terminal through detailed evaluation of the vibration modal changes. This design not only significantly improves the accuracy and timeliness of fault detection, but also provides scientific basis and technical support for the operation and maintenance of the power system, thereby effectively improving the operation efficiency and safety of the power system. In summary, the device optimizes the signal processing process and introduces advanced modal analysis technology to realize accurate monitoring and rapid response of the health status of the cable GIS terminal, greatly enhancing the reliability and efficiency of power system operation and maintenance.

[0091] In an embodiment, a working method of the anti-induction impact cable GIS terminal vibration signal acquisition device described above is also provided, comprising: The vibration signal of the cable GIS terminal is captured by the measurement module 1, and after amplification and filtering by the signal acquisition module 2, the processed signal is simultaneously sent to the signal acquisition module 3 for storage and the modal analysis module 4 for analysis; the modal analysis module 4 models the cable GIS terminal based on the vibration signal and analyzes the vibration modal changes to determine whether there is a mechanical defect inside.

[0092] It should be noted that those skilled in the art can clearly understand the specific implementation process of the working method of the anti-induction impact cable GIS terminal vibration signal acquisition device described above, which can refer to the corresponding description in the foregoing device embodiments. For the convenience and brevity of description, it will not be repeated here.

[0093] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A vibration signal acquisition device for cable GIS terminals that is resistant to induced impact, characterized in that, include: The system includes a measurement module, a signal acquisition module, a signal acquisition module, a modal analysis module, and a power input module. The measurement module is connected to the signal acquisition module. The signal acquisition module is connected to the signal acquisition module, the modal analysis module, and the power input module, respectively. The vibration signal of the cable GIS terminal is captured by the measurement module, and after being amplified and filtered by the signal acquisition module, the processed signal is simultaneously sent to the signal acquisition module for storage and the modal analysis module for analysis. The modal analysis module models the cable GIS terminal based on the vibration signal and analyzes its vibration modal changes to determine whether there are internal mechanical defects.

2. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 1, characterized in that, The signal acquisition module includes a power input surge protection circuit, a signal input surge protection circuit, a signal processing module, a power module, a first interface, and a second interface; the power input surge protection circuit is connected to the power module; the signal input surge protection circuit is connected to the signal processing module; the signal processing module is connected to the first interface; the signal processing module is connected to the second interface; the first interface is connected to the signal acquisition module; the second interface is connected to the modal analysis module; and the power input module is connected to the power input surge protection circuit.

3. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 2, characterized in that, The power input surge protection circuit includes a fuse, a varistor, an LED indicator branch, and a transient suppression diode; the fuse is connected in series in the DC input line and is connected to the power module; one end of the varistor is grounded, and the other end of the varistor is connected between the fuse and the power module; the LED indicator branch is connected in parallel with the varistor. One end of the transient suppression diode is connected between the fuse and the power module; the other end of the transient suppression diode is grounded.

4. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 3, characterized in that, The positive and negative terminals of the DC input line are respectively connected to the power input surge protection circuit.

5. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 3, characterized in that, The LED indicator branch includes a diode, an indicator light, and a current-limiting resistor; one end of the varistor is connected to the DC input line through a fuse; the diode is connected in series with the indicator light; the indicator light is connected to one end of the current-limiting resistor; and the other end of the current-limiting resistor is grounded.

6. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 2, characterized in that, The signal input surge protection circuit includes a transient suppression diode; one end of the transient suppression diode is grounded, and the other end of the transient suppression diode is connected to the signal interface; the signal interface is connected to the measurement module.

7. A cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 6, characterized in that, The signal processing module includes an operational amplifier connected to the signal interface; the operational amplifier is also connected in parallel with a resistor and a capacitor.

8. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 7, characterized in that, The signal processing module includes a filter, and the operational amplifier is connected to the filter; the filter is connected to the first interface.

9. A vibration signal acquisition device for cable GIS terminals to prevent induced impact as described in claim 8, characterized in that, The filter includes a high-pass filter and a low-pass filter; the operational amplifier is connected to the high-pass filter; the high-pass filter is connected to the low-pass filter; and the low-pass filter is connected to the first interface.

10. A method for operating a cable GIS terminal vibration signal acquisition device for preventing induced impact as described in any one of claims 1 to 9, characterized in that, include: The vibration signal of the cable GIS terminal is captured by the measurement module, and after being amplified and filtered by the signal acquisition module, the processed signal is simultaneously sent to the signal acquisition module for storage and the modal analysis module for analysis. The modal analysis module models the cable GIS terminal based on the vibration signal and analyzes its vibration modal changes to determine whether there are internal mechanical defects.

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