Cable gis terminal vibration signal acquisition device against induction impact and working method

Abstract

The embodiment of the application discloses a cable GIS terminal vibration signal acquisition device capable of preventing induction impact 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 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 through the measurement module, the processed signal is sent to the signal acquisition module storage and the modal analysis module analysis after amplification and filtering processing through the signal acquisition module; the modal analysis module models the cable GIS terminal based on the vibration signal and analyzes the vibration modal change, so as to judge whether there is a mechanical defect inside. Through the device of the embodiment of the application, not only the sensing ability of the cable GIS terminal fault can be effectively improved, but also the operation and maintenance efficiency and safety of the power system can be significantly improved.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a vibration signal acquisition device and working method for cable GIS terminals that are protected against induced impact. Background Technology

[0002] During operation, electrical equipment vibrates due to the influence of electric field forces and the Ampere force generated by current. These vibrations contain important information about mechanical defects, such as changes in the internal structure of the equipment, making vibration detection an effective method for detecting defects in electrical equipment. In particular, cable GIS (Gas Insulated Switchgear) terminals, as key components connecting GIS equipment and cables, play a crucial role in power transmission systems. However, currently, there are no vibration signal acquisition devices specifically designed for the complex environments in which cable GIS terminals operate. This makes it difficult to detect faults in cable GIS terminals in a timely manner, and maintenance and repair face numerous challenges.

[0003] Cable GIS terminals typically operate in environments such as high-voltage test fields or substations. These locations not only have complex electromagnetic environments but also experience induced high voltages due to voltage fluctuations. When induced high voltages act on signal acquisition devices, they severely impact the accuracy of signal acquisition and may even damage internal components such as power supplies. To overcome these problems, a new type of vibration signal acquisition device capable of resisting the effects of induced impulse voltages is needed. Vibration modes, as parameters reflecting the vibration characteristics of an object, can be analyzed by modeling the cable GIS terminal, marking measurement points, and inputting vibration data from those points. This analysis reveals the vibration modes of the cable GIS terminal and thus reflects its internal mechanical defects. Changes in the internal structure of the cable GIS terminal directly cause changes in vibration modes; monitoring these changes allows for the detection of potential mechanical defects.

[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 impact of induced surge voltage on signal acquisition devices. For example, patent CN119766198A introduces a filter control method and its anti-electromagnetic interference device, but does not mention specific measures to deal with induced surge voltage; patent CN119534969A describes an anti-electromagnetic interference current sensor circuit, but similarly ignores the impact of induced surge high voltage; while patent CN103091609A focuses on online monitoring of partial discharge in GIS, rather than the collection and analysis of vibration signals.

[0005] Therefore, it is necessary to design a new device that can not only effectively improve the detection capability of cable GIS terminal faults, but also significantly improve the operation and maintenance efficiency and safety of the power system. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a vibration signal acquisition device and working method for cable GIS terminals that are resistant to induced impact.

[0007] To solve the above-mentioned technical problems, the objective of this invention is achieved through the following technical solution: A vibration signal acquisition device for cable GIS terminals that is resistant to induced impact is provided, comprising: 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.

[0008] 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.

[0009] The further technical solution is as follows: 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.

[0010] The further technical solution is as follows: 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 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.

[0011] The further technical solution is as follows: the positive and negative terminals of the DC input line are respectively connected to the power input surge protection circuit.

[0012] The further technical solution is as follows: 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.

[0013] The further technical solution is as follows: 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.

[0014] The further technical solution is as follows: the signal processing module includes an operational amplifier, which is connected to the signal interface; the operational amplifier is also connected in parallel with a resistor and a capacitor.

[0015] A further technical solution is as follows: the signal processing module includes a filter, the operational amplifier is connected to the filter, and the filter is connected to the first interface.

[0016] The further technical solution is as follows: 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.

[0017] The present invention also provides a method for operating the above-mentioned anti-induced shock cable GIS terminal vibration signal acquisition device, comprising:

[0018] 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.

[0019] The advantages of this invention compared to existing technologies are as follows: By integrating a measurement module, a signal acquisition module, a signal processing module, a modal analysis module, and a power input module, this invention achieves precise capture, efficient processing, and in-depth analysis of vibration signals from cable GIS terminals. Specifically, the measurement module is responsible for real-time monitoring of the vibration of the cable GIS terminal, while the signal acquisition module amplifies and filters the collected vibration signals to remove noise interference and improve signal quality. Subsequently, the optimized vibration signal is simultaneously transmitted to the signal acquisition module for storage and then sent to the modal analysis module for in-depth analysis. Through detailed evaluation of vibration modal changes, the modal analysis module can accurately identify potential mechanical defects inside the cable GIS terminal. This design not only significantly improves the accuracy and timeliness of fault detection but also provides a scientific basis and technical support for power system operation and maintenance, thereby effectively improving the operating efficiency and safety of the power system. In summary, this device, through comprehensive optimization of the signal processing flow and the introduction of advanced modal analysis technology, achieves precise monitoring and rapid response to the health status of cable GIS terminals, greatly enhancing the reliability and efficiency of power system operation and maintenance.

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic block diagram of a cable GIS terminal vibration signal acquisition device for preventing induced impact, provided in an embodiment of the present invention;

[0023] Figure 2 A circuit diagram of a cable GIS terminal vibration signal acquisition device for preventing induced impact is provided in an embodiment of the present invention;

[0024] Explanation of the markings in the image:

[0025] 1. Measurement module; 2. Signal acquisition module; 3. Signal acquisition module; 4. Modal analysis module; 5. Power input module. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0030] During operation, electrical equipment vibrates due to the Ampere force generated by electric field and current. These vibrations contain important information about changes in the internal structure of the equipment, making vibration detection an effective defect detection method. In particular, cable GIS terminals, as a critical component connecting GIS equipment and cables, operate in complex electromagnetic environments. However, there is currently a lack of specially designed vibration signal acquisition devices to address the threats posed by induced high voltage to signal acquisition accuracy and device safety. Developing a novel acquisition device resistant to induced impulse voltage and utilizing vibration modal analysis can effectively monitor internal mechanical defects in cable GIS terminals. While existing technologies offer some electromagnetic interference protection measures, they do not solve the problem of induced impulse voltage. Currently, there is a lack of circuit design specifically for vibration signal acquisition devices of cable GIS terminals; existing devices do not consider the impact of induced impulse voltage that may occur in the application environment of cable GIS terminals; and existing vibration signal acquisition devices fail to achieve simultaneous data storage and modal analysis.

[0031] Therefore, this invention also provides a cable GIS terminal vibration signal acquisition device that is resistant to induced impact, which can not only effectively improve the fault detection capability of cable GIS terminals, but also significantly improve the operation and maintenance efficiency and safety of power systems.

[0032] This anti-induced impact cable GIS terminal vibration signal acquisition device integrates multiple modules including measurement, signal acquisition, processing, acquisition, and modal analysis. It features specially designed surge protection circuits for both power and signal inputs, effectively mitigating the impact of induced impact voltages on signal acquisition and ensuring data accuracy and equipment safety. It utilizes high-pass and low-pass filters for signal processing and modal analysis to identify changes in internal mechanical defects within the cable GIS terminal, thereby improving fault detection capabilities. Furthermore, the entire signal acquisition module 2 is housed in a shielded protective enclosure, further enhancing anti-interference performance. This allows maintenance personnel to detect potential problems more promptly and accurately, significantly improving the operational efficiency and safety of the power system.

[0033] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0034] Please see Figure 1 A vibration signal acquisition device for cable GIS terminals that is resistant to induced impact includes: 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 to the signal acquisition module 2; the signal acquisition module 2 is connected to the signal acquisition module 3, the modal analysis module 4, and the power input module 5, respectively.

[0035] The vibration signal of the cable GIS terminal is captured by the measurement module 1, and after being amplified and filtered 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. The modal analysis module 4 models the cable GIS terminal based on the vibration signal and analyzes its vibration modal changes to determine whether there are internal mechanical defects.

[0036] Specifically, the measurement module 1 is responsible for capturing the vibration signals generated by the cable GIS terminal and transmitting these signals to the signal acquisition module 2 through the shielded cable.

[0037] The signal acquisition module 2 receives the vibration signal from the measurement module 1. First, it undergoes surge protection via a transient suppression diode, then is amplified by an operational amplifier and processed by high-pass and low-pass filters to ensure signal quality and accuracy. The processed signal is then sent to the signal acquisition module 3 and the modal analysis module 4.

[0038] The signal acquisition module 3 stores the processed vibration signal for easy data analysis and retrieval later.

[0039] After modeling the cable GIS terminal and setting measurement points, the modal analysis module 4 uses the collected vibration signal data to analyze the vibration modes of the cable GIS terminal in order to determine whether there are internal mechanical defects.

[0040] The power input module 5 provides a stable DC power supply for the entire system. At the same time, the power input line is equipped with a dual anti-induced surge circuit, which includes a fuse, a varistor, and a transient suppression diode, to effectively prevent the impact of induced surge voltage caused by changes in ambient high voltage on the system.

[0041] Furthermore, to facilitate monitoring of the varistor's status, an LED branch was added between it and the fuse. When the varistor breaks down, the LED goes out, indicating to the user that the damaged component needs to be replaced. This design not only improves the system's safety and reliability but also simplifies maintenance. Overall, the device effectively acquires, stores, and analyzes vibration signals from cable GIS terminals, helping to promptly detect potential mechanical defects.

[0042] In one embodiment, please refer to Figure 2 The aforementioned signal acquisition module 2 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; and the signal processing module is connected to the second interface.

[0043] The first interface is connected to the signal acquisition module 3; the second interface is connected to the modal analysis module 4; and the power input module 5 is connected to the power input surge protection circuit.

[0044] These components work together to ensure the effective acquisition, processing, and analysis of vibration signals from cable GIS terminals. The specific structure is as follows:

[0045] Power Input Surge Protection Circuit: This circuit is installed in the DC power input line to prevent damage to the system from induced surge voltages caused by changes in ambient high voltage. It consists of a series fuse, a varistor circuit (including an additional fuse to protect the varistor), a transient voltage suppressor diode, and an LED status indicator branch. When excessive current or voltage occurs, the fuse will blow to protect downstream circuitry, while the varistor absorbs large energy surges. The transient voltage suppressor diode responds quickly to transient spikes, preventing damage to other components. The LED indicates the varistor's operating status; if it goes out, it indicates that the varistor may have broken down.

[0046] Signal input surge protection circuit: To reduce interference from components on the strength and accuracy of the received signal, only transient suppression diodes are used as surge protection measures. This design ensures that even under induced surge conditions, the surge is effectively diverted to ground, thereby protecting downstream amplifiers and other sensitive components from damage.

[0047] The signal processing module includes components such as operational amplifiers, differential-to-single-ended converters, high-pass filters, and low-pass filters. It is responsible for receiving the raw vibration signal from measurement module 1 and amplifying and filtering it to improve signal quality and accuracy.

[0048] Power module: After passing through the power input surge protection circuit, it provides stable DC power to the entire system, including the signal processing module and other parts that require power.

[0049] First interface and second interface: The processed signal is transmitted to the signal acquisition module 3 for storage through the first interface; at the same time, the same data is transmitted to the modal analysis module 4 through the second interface, so as to further analyze the vibration mode of the cable GIS terminal and whether there are mechanical defects inside.

[0050] This design not only effectively resists high-pressure shocks in the environment, ensuring the safety and reliability of the equipment, but also enables real-time monitoring and analysis of the vibration of cable GIS terminals, helping to promptly identify and resolve potential problems. Furthermore, the use of LEDs to visually display the status of the varistor simplifies the maintenance process and improves the system's operability and maintenance efficiency.

[0051] In one embodiment, please refer to Figure 2 The aforementioned 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. 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.

[0052] In one embodiment, please refer to Figure 2 The positive and negative terminals of the aforementioned DC input line are respectively connected to power input surge protection circuits.

[0053] This circuit includes a fuse, a varistor, an LED indicator branch, and a transient voltage suppressor diode. Its design aims to effectively withstand induced surge voltages caused by changes in ambient high voltage, while providing simple visual indicators to help users identify the operating status of circuit components.

[0054] The fuse is connected in series in the DC input circuit, before the varistor and transient voltage suppressor diode. Its main function is to melt directly when the current generated by the induced surge is too large, thereby cutting off the subsequent circuit and preventing damage to a wider area.

[0055] One end of the varistor is grounded, and the other end 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 when the voltage rises to share the higher voltage, preventing other circuit components from failing due to high voltage. Under normal operating conditions, the varistor maintains high impedance, but in the event of an overvoltage, it can quickly conduct, directing excess energy to ground.

[0056] The LED indicator branch is connected in parallel with the varistor and includes an LED and a current-limiting resistor. When the varistor is operating normally, the LED lights up; if the varistor breaks down due to excessive voltage, the LED branch is short-circuited, causing the LED to turn off. This provides a clear way for users to understand the varistor's status and replace it promptly.

[0057] One end of the transient voltage suppressor diode is connected between the fuse and the power module, and the other end is grounded. The transient voltage suppressor diode is used to quickly respond to transient peak overvoltages, effectively diverting these peak voltages to ground and protecting downstream electronic components from damage.

[0058] To ensure system stability and reliability, the positive and negative terminals of the DC input lines are equipped with the aforementioned power input surge protection circuits. This configuration not only provides independent protection for each line but also effectively reduces potential risks caused by induced surges.

[0059] Specifically:

[0060] At the positive terminal, the power input surge protection circuit consists of a fuse, a varistor, an LED indicator branch, and a transient suppression diode, which are connected in sequence as described to form effective protection for the positive input.

[0061] At the negative extreme, a similar configuration is used to ensure the safety of the entire system and maintain its stability even under induced shock conditions.

[0062] In this way, the cable GIS terminal vibration signal acquisition device can not only operate stably in complex environments, but also promptly identify and address potential problems through simple visual inspection, improving system reliability and maintenance efficiency. Furthermore, the application of modal analysis module 4 makes it possible to detect internal mechanical defects in the cable GIS terminal, further enhancing the equipment's safety performance.

[0063] In one embodiment, please refer to Figure 2 The aforementioned 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 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.

[0064] Specifically, the LED indicator branch includes a diode, an indicator light, and a current-limiting resistor. It is designed to visually display the status of the varistor.

[0065] One end of the varistor is connected to the DC input line via a fuse: this ensures that the fuse will blow in case of excessive current, protecting the subsequent circuitry from damage.

[0066] Diode and indicator light connected in series: This combination is mainly used to prevent reverse current from damaging the LED and to ensure that the LED lights up normally when the varistor is working properly.

[0067] The indicator light is connected to the current-limiting resistor: The function of the current-limiting resistor is to limit the current flowing through the LED to prevent the LED from burning out due to excessive current.

[0068] The other end of the current-limiting resistor is grounded: this provides a safe current path, making the entire circuit more stable and safer.

[0069] In one embodiment, please refer to Figure 2 The aforementioned 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.

[0070] In one embodiment, please refer to Figure 2 The aforementioned signal processing module includes an operational amplifier, which is connected to a signal interface; the operational amplifier is also connected in parallel with resistors and capacitors.

[0071] Specifically, the signal processing module consists of an operational amplifier (OPA) and related components, responsible for amplifying the weak vibration signal and converting it into a form suitable for further analysis.

[0072] Operational amplifier connected to signal interface: directly receives signals from the signal input surge protection circuit.

[0073] Operational amplifiers also have resistors and capacitors connected in parallel: these components are used to adjust the amplifier's gain and frequency response to optimize signal quality.

[0074] In one embodiment, please refer to Figure 2 The aforementioned signal processing module includes a filter, an operational amplifier connected to the filter, and the filter connected to the first interface.

[0075] In one embodiment, please refer to Figure 2 The aforementioned filters include 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.

[0076] In this embodiment, the filter module includes a high-pass filter (HPF) and a low-pass filter (LPF) to remove unwanted frequency components and retain useful vibration signals.

[0077] Connect the operational amplifier to the high-pass filter: first, remove low-frequency noise from the signal.

[0078] Connect the high-pass filter and the low-pass filter: then remove high-frequency interference and retain only the vibration signal within the target frequency band.

[0079] The low-pass filter is connected to the first interface: the final processed signal is output to the signal acquisition module 3 and the modal analysis module 4 through the first interface.

[0080] This cable GIS terminal vibration signal acquisition device not only effectively protects the power input and signal input sections from induced impact voltage, but also provides intuitive monitoring of the varistor's operating status via LED indicators. Simultaneously, by precisely amplifying and filtering the acquired vibration signals, and combining this with modal analysis technology, it can accurately detect any mechanical defects within the cable GIS terminal. This comprehensive design significantly improves the system's reliability and practicality, providing strong technical support for the safe operation of the cable GIS terminal.

[0081] In one embodiment, please refer to Figure 2 The aforementioned signal acquisition module 2 is housed inside a protective casing, which has a shielding function.

[0082] 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 housed in a protective shell with shielding. This design not only helps 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.).

[0083] 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 can be selected according to specific requirements.

[0084] In addition to electromagnetic shielding, the protective shell should also have certain physical protection capabilities, such as a waterproof and dustproof rating of IP65 or above, to adapt to various complex working environments.

[0085] Considering that the internal electronic components may generate heat during operation, the protective case design needs to take into account good heat dissipation performance. Heat dissipation efficiency can be improved by adding heat sinks, ventilation holes, or using heat-dissipating materials, ensuring long-term stable operation of the equipment.

[0086] While protective cases offer robust protection, their design must also consider ease of maintenance and repair. For example, detachable panels or quick-connectors can be incorporated to allow users to replace components or troubleshoot problems without compromising the overall seal.

[0087] The signal input surge protection circuit includes transient voltage suppressor diodes (TVS) to prevent rapid transient overvoltage spikes from damaging subsequent circuitry. These sensitive components are housed in a shielded enclosure, which more effectively protects them from external electromagnetic interference and ensures their normal operation.

[0088] Operational amplifiers and filter modules are responsible for amplifying weak vibration signals and removing unwanted frequency components. Because these operations require extremely high signal purity, placing them in a shielded environment is crucial to significantly reduce the impact of external interference on signal processing quality.

[0089] The pre-processed vibration signal from the interface of modal analysis module 4 is transmitted to modal analysis module 4 through a shielded cable. This module is also located inside the protective shell to ensure that the data transmission path is as short as possible and is not affected by the outside world, thereby improving the accuracy of the final analysis results.

[0090] In summary, placing the signal acquisition module 2 within a shielded protective housing not only effectively improves the system's anti-interference capability and reliability but also helps extend the equipment's service life and ensures long-term stable operation. This design provides a solid foundation for the overall performance of the cable GIS terminal vibration signal acquisition device.

[0091] The device in this embodiment aims to solve the problem of induced surge voltage caused by changes in environmental high voltage. Simultaneously, it uses LEDs in the surge protection circuit to visually indicate the effectiveness of the varistor, allowing for timely replacement of faulty components. Furthermore, the device synchronously outputs the collected vibration signals to the signal acquisition module 3 and the modal analysis module 4. While storing the data, it performs real-time analysis of the vibration modes of the cable GIS terminal to determine if any internal mechanical defects exist.

[0092] Two surge protection mechanisms are implemented in the DC input circuit of the power module. First, a fuse is connected in series to quickly melt and disconnect 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 suppression diode is connected in parallel to form a fast-response spike suppression path. Only the transient suppression diode is retained in the signal input circuit as a surge protection component to avoid interference from additional components on signal accuracy.

[0093] In a varistor-based circuit designed to prevent induced shocks, an LED indicator branch consisting of a diode, an LED, and a current-limiting resistor is drawn between the fuse and the varistor. When the varistor short-circuits due to overvoltage, the LED branch is bypassed, and the normally lit LED goes out, prompting maintenance personnel to immediately replace the damaged varistor.

[0094] After the vibration signal is collected and processed, it is simultaneously transmitted to the signal acquisition module 3 and the modal analysis module 4: the former is responsible for data storage, and the latter, after presetting the cable GIS model and measurement point information, uses real-time vibration data to perform modal analysis and identify mechanical defects inside the cable GIS terminal through changes in vibration modes.

[0095] The signal acquisition device circuit for induced surge protection includes: a surge protection circuit at the signal input terminal, an operational amplifier, a differential-to-single-ended converter circuit, a high-pass filter, a low-pass filter, a surge protection circuit at the signal output terminal and DC power input terminal, a power module for the acquisition unit, and a shielded grounded enclosure. The specific structure is as follows: Figure 2 As shown.

[0096] Before the power module is connected, the DC power input terminal is equipped with dual protection against induced surges on both DC buses. First, a fuse is connected in series; when the induced surge current is too high, it melts directly, protecting the downstream circuitry. Then, a branch containing a varistor is connected in parallel for induced surge protection. This branch also has another fuse connected in series to prevent the varistor from burning out due to overcurrent. In this branch, an indicator branch consisting of a diode, LED, and current-limiting resistor is led out between the fuse and the varistor to display in real time whether the varistor is in normal working condition. As a high-energy surge absorption element, the varistor's resistance decreases significantly as the voltage increases, thus sharing the overvoltage load and protecting other components. When the varistor is not broken down, the LED branch is not short-circuited, and the LED remains lit; once the varistor breaks down and short-circuits, the LED branch is bypassed, the LED goes out, indicating that the varistor has failed. Transient voltage suppression diodes are also connected in parallel on the DC input line to quickly suppress transient spike overvoltages, further protecting downstream components. The power module, after these protections, provides a stable excitation for the entire data acquisition device.

[0097] The signal input terminal uses only transient suppression diodes to form an anti-induced shock circuit, avoiding the influence of unnecessary components on signal strength and accuracy. When an impact occurs, the transient suppression diodes quickly conduct, diverting the inrush current to ground and preventing damage to subsequent amplifiers and other components. After the signal is amplified and converted into a single-ended signal, it passes through high-pass and low-pass filters in sequence, ultimately outputting a clean vibration signal.

[0098] like Figure 1As shown, after the measurement module 1 acquires the vibration signal from the cable GIS terminal, it is sent to the signal acquisition module 2 via a shielded cable. After amplification and filtering, the signal acquisition module 2 outputs the signal synchronously to the signal acquisition module 3 and the modal analysis module 4 via the shielded cable again. The signal acquisition module 3 stores the vibration signal; the modal analysis module 4 performs vibration modal analysis based on the pre-established cable GIS terminal model and measurement point information, using real-time vibration data to determine whether there are mechanical defects inside the cable GIS terminal by analyzing changes in modal parameters. The entire system is powered by an external DC power supply.

[0099] In summary, differentiated anti-induced surge strategies are adopted at the power input and signal input ends: the power input end is equipped with both a varistor and a transient suppression diode to handle high-energy surges and rapid spikes respectively; the signal input end only retains the transient suppression diode to prevent signal attenuation or accuracy degradation caused by the introduction of components. An LED indicator branch is added to the varistor protection circuit to visually display whether the varistor has broken down, facilitating timely replacement by maintenance personnel. Breaking through the limitations of traditional acquisition devices that only display and store data, real-time vibration signals are simultaneously sent to the modal analysis module 4. Using a pre-established cable GIS terminal model and measurement point information, vibration modes are calculated in real time, and internal mechanical defects are judged based on modal changes, enabling early detection and location of defects.

[0100] The cable GIS terminal is not limited by specific voltage level or equipment model. The varistors and transient suppression diodes used do not have fixed models; they only need to meet performance requirements. Other electronic components also do not have fixed models; they only need to meet functional requirements. The power input voltage and current are determined based on the actual operating power of the device and are not specifically limited.

[0101] The aforementioned vibration signal acquisition device for cable GIS terminals, designed to withstand induced shocks, integrates 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. This integration enables precise capture, efficient processing, and in-depth analysis of vibration signals from the cable GIS terminals. Specifically, the measurement module 1 monitors the vibration of the cable GIS terminals in real time, while the signal acquisition module 2 amplifies and filters the collected vibration signals to remove noise interference and improve signal quality. The optimized vibration signals are then 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, through meticulous evaluation of vibration modal changes, accurately identifies potential mechanical defects within the cable GIS terminals. This design not only significantly improves the accuracy and timeliness of fault detection but also provides a scientific basis and technical support for power system operation and maintenance, thereby effectively improving the operational efficiency and safety of the power system. In summary, this device, by comprehensively optimizing the signal processing flow and introducing advanced modal analysis technology, achieves precise monitoring and rapid response to the health status of cable GIS terminals, greatly enhancing the reliability and efficiency of power system operation and maintenance.

[0102] In one embodiment, a method for operating the above-mentioned anti-induced shock cable GIS terminal vibration signal acquisition device is also provided, comprising:

[0103] The vibration signal of the cable GIS terminal is captured by the measurement module 1, and after being amplified and filtered 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. The modal analysis module 4 models the cable GIS terminal based on the vibration signal and analyzes its vibration modal changes to determine whether there are internal mechanical defects.

[0104] It should be noted that those skilled in the art can clearly understand the specific implementation process of the above-mentioned anti-inductive shock cable GIS terminal vibration signal acquisition device. The specific implementation process can be found in the corresponding description in the aforementioned device embodiments. For the sake of convenience and brevity, it will not be repeated here.

[0105] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the 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. 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. 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 to the DC input line through the fuse; 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.

2. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 1, characterized in that, The positive and negative terminals of the DC input line are respectively connected to the power input surge protection circuit.

3. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 1, characterized in that, The LED indicator branch includes a diode, an indicator light, and a current-limiting resistor; 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.

4. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 1, 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.

5. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 4, 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.

6. The cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 5, 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.

7. A cable GIS terminal vibration signal acquisition device for preventing induced impact according to claim 6, 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.

8. 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 7, 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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