Vibration test system and method for GIS disconnecting switch

Abstract

The invention relates to a vibration test system and method for a GIS isolation switch. The system comprises a current booster, a GIS equipment loop and a plurality of vibration sensors. The current booster is sleeved on a shell of the GIS equipment loop and provides working currents with different magnitudes for the GIS equipment loop; the GIS equipment loop comprises complete GIS equipment, and specifically comprises an insulator and a GIS isolating switch; and the plurality of vibration sensors are arranged at insulators, connected with other cavities, of the cavity where the GIS isolation switch is located, and are used for capturing and measuring vibration signals around the GIS isolation switch. Compared with the prior art, the method has the advantages that the obtained test data is more accurate and more comprehensive, and synchronous measurement of vibration signals of the GIS isolation switch at multiple positions is realized.

Description

Technical Field

[0001] The invention relates to the technical field of GIS isolating switches, and in particular to a vibration test system and method for a GIS isolating switch. Background Art

[0002] Gas Insulated Switchgear (GIS) is a high-voltage electrical device that uses sulfur hexafluoride (SF6) gas as an insulating medium to encapsulate various electrical equipment in a metal sealed container. Compared with traditional air-insulated switchgear, GIS has significant advantages, including small size, small footprint, high operating reliability, and long maintenance cycle. These advantages make GIS widely used in power systems, especially in environments with limited space and places requiring high reliability.

[0003] As the GIS operation time increases, equipment aging and human operation factors may cause abnormal problems in the mechanical structure. As one of the core components of GIS, the frequent operation of the isolating switch causes its contacts to gradually wear out under the impact of the mechanical closing force and the stress between the contacts, which in turn leads to poor contact between the contacts. This poor contact will cause the internal temperature of the GIS to increase and generate abnormal vibration signals. Long-term accumulation may lead to equipment failure or even accidents. Therefore, the implementation of online monitoring of the operating status of the GIS isolating switch is of great significance for preventing and reducing equipment failures.

[0004] Research shows that vibration signals can effectively reflect the operating status of GIS disconnectors. Since vibration signal acquisition only requires the installation of sensors on the surface of the equipment without the need for electrical connections, online monitoring of the status of GIS disconnectors is highly feasible. Experiments have found that when there are mechanical defects in GIS equipment, under the action of the alternating electromotive force of the load current, periodic abnormal vibrations different from the simple harmonic vibrations of twice the fundamental frequency on the surface of the shell will be generated. Therefore, by monitoring these abnormal vibration signals, the mechanical status of the GIS equipment can be effectively judged. The frequency of vibration signals is usually concentrated below 3kHz, which makes it a feasible method to detect abnormal contact conditions by measuring vibrations on metal enclosed shells.

[0005] After searching, Chinese invention patent publication number CN105116320B discloses a gas-insulated combination electrical appliance disconnector contact state test and testing system, including a gas-insulated combination electrical appliance housing, a vibration acceleration sensor, an oscilloscope, and a current booster; the vibration acceleration sensor is arranged on the top of the gas-insulated combination electrical appliance housing, and the oscilloscope is arranged on the upper part of the vibration acceleration sensor; the current booster is sleeved on the bottom of the gas-insulated combination electrical appliance housing, and a current booster operating table is also arranged at the lower part of the current booster; a test cavity is arranged inside the gas-insulated combination electrical appliance housing, a guide rod is arranged between the gas-insulated combination electrical appliance housing and the test cavity, a disconnector is arranged on the guide rod, and the bottom of the gas-insulated combination electrical appliance housing is connected to the bottom of the test cavity through a pot-type insulator, so as to realize the analysis of the vibration signal characteristics of the disconnector in the gas-insulated combination electrical appliance in different contact states. The existing patent has the problem that the vibration sensor deployment is not reasonably set, so the accuracy and comprehensiveness of the measurement signal are not enough.

[0006] How to achieve accurate and comprehensive measurement test of GIS disconnector vibration signals has become a technical problem that needs to be solved. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a GIS disconnector vibration signal propagation and distribution characteristics test system and method.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] According to one aspect of the present invention, a vibration test system for a GIS disconnector is provided, the system comprising a current riser, a GIS equipment loop and a plurality of groups of vibration sensors;

[0010] The current booster is sleeved on the GIS equipment circuit housing to provide working currents of different sizes for the GIS equipment circuit;

[0011] The GIS equipment circuit includes a complete GIS equipment, including insulators and GIS disconnectors;

[0012] Each group of vibration sensors is deployed at the insulator connecting the cavity where the GIS disconnector is located with other cavities, and is responsible for capturing and measuring vibration signals around the GIS disconnector.

[0013] Preferably, the GIS equipment circuit further comprises a moving contact operation box connected to the GIS isolating switch;

[0014] The moving contact operation box is used to adjust the moving contact closing distance and the degree of wear of the moving contact, and to simulate different closing states of the GIS disconnector.

[0015] More preferably, the GIS disconnector includes states of fully closed, incompletely closed and increased contact gap.

[0016] Preferably, the GIS disconnector is deployed at each busbar connection, at the connection between the busbar and each component, or at the connection between each component, wherein each busbar includes an X-axis horizontal busbar, a Y-axis horizontal busbar and a Z-axis vertical busbar, and wherein each component includes an insulator, a voltage transformer, a CT current transformer, a lightning arrester and a circuit breaker.

[0017] Preferably, each group of vibration sensors is installed in a circular distributed manner at four locations of up, down, left, and right of a certain cross section of the loop housing of the GIS equipment.

[0018] More preferably, the number of the vibration sensors in each group is four.

[0019] Preferably, the current booster adopts a through-hole design and applies working currents of different magnitudes to the GIS equipment loop based on the principle of electromagnetic induction.

[0020] Preferably, the system further comprises a signal acquisition device connected to the vibration sensor, which is used for collecting, processing and recording vibration signals of all vibration sensors.

[0021] According to another aspect of the present invention, a vibration test method for a GIS disconnector is provided, the method comprising:

[0022] Step S1, adjusting the current of the current booster;

[0023] Step S2, adjusting the moving contact operation box, setting different states of the GIS isolating switch, and synchronously recording the vibration signals measured by all vibration sensors in different GIS isolating switch states when the current current is applied to the GIS equipment circuit;

[0024] Step S3, repeating steps S1 to S2, adjusting the current of the current booster, and testing the corresponding vibration signals under different working conditions until the test is completed and exited.

[0025] Preferably, the method also includes ensuring that all devices and components on the GIS equipment loop are properly connected, the vibration sensor is firmly installed, and the signal acquisition device is calibrated before the test.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1) The present invention deploys multiple vibration sensors at the insulators connecting the cavity where the GIS disconnector is located and other cavities. Vibration signals around the GIS disconnector are obtained through synchronous measurement of multiple vibration sensors. The distributed measurement of multiple sensors can not only improve the spatial resolution of signal acquisition, but also more comprehensively capture the vibration information of various areas on the surface of the equipment, thereby ensuring the accuracy and comprehensiveness of the test data.

[0028] 2) The present invention installs vibration sensors at different positions in the GIS loop. Each group of vibration sensors is deployed in a ring-shaped distributed manner, thereby realizing comprehensive and synchronous measurement of vibration signals of multiple GIS isolation switches, which is helpful for subsequent data analysis and fault diagnosis.

[0029] 3) The test system of the present invention allows flexible simulation of the vibration conditions of the GIS disconnector in different states by adjusting the closing distance of the moving contact, setting different contact wear degrees, and adjusting different test currents. This state adjustable function enables the test system to simulate and study various possible fault conditions, ensuring the comprehensiveness of the test data and subsequent analysis, thereby contributing to the development of more complete fault diagnosis algorithms and strategies. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the GIS equipment circuit in the present invention;

[0031] Figure 2 This is a schematic diagram of the state of the simulated isolating switch in the test section of the present invention;

[0032] Figure 3 It is a schematic diagram of the sensor installation position of the test section in the present invention;

[0033] Figure 4 It is a schematic cross-sectional view of the installation of the vibration sensor in the GIS equipment loop in the present invention;

[0034] In the attached drawings, 1: current booster, 21: insulator, 22: moving contact operation box, 23: disconnector, 24: X-axis horizontal bus, 25: Y-axis horizontal bus, 26: Z-axis vertical bus, 3: vibration sensor, A: first collection surface, B: second collection surface, C: third collection surface. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] Example 1

[0037] This embodiment relates to a vibration test system for a GIS isolating switch, which is attached to and installed on the periphery of a GIS device. Figure 1 The system includes a flow riser 1, a GIS equipment loop, a vibration sensor 3 and a signal acquisition device.

[0038] The current booster 1 adopts a through-hole design and provides different operating currents for the GIS equipment loop based on the principle of electromagnetic induction. The current booster 1 is connected to the GIS equipment loop and can operate stably under a variety of current conditions. The current can be adjusted and controlled to simulate various operating conditions of the GIS equipment under actual working conditions. The adjustment range of the current booster 1 covers the operating current of the GIS equipment under different load conditions, ensuring the diversity and applicability of the test.

[0039] like Figure 1 GIS equipment circuit is the core component of the test system, including a complete GIS equipment. Specifically, the GIS equipment circuit includes insulator 21, GIS disconnector 23, moving contact operation box 22 connected to disconnector 23, X-axis horizontal bus 24, Y-axis horizontal bus 25, Z-axis vertical bus 26, and forms a circuit. Optionally, the GIS equipment circuit also includes PT voltage transformer, CT current transformer, lightning arrester, circuit breaker and other components.

[0040] The GIS disconnector 23 is deployed at the connection points of each busbar, the connection points between the busbar and each component, or the connection points of each component.

[0041] like Figure 2 By controlling the movement of the moving contact operating box 22, the closing distance of the moving contact and the degree of wear of the moving contact are adjusted, thereby realizing the state adjustment function of the GIS disconnector 23 connected to the moving contact operating box 22. By changing the closing distance of the moving contact, different closing states of the GIS disconnector 23 can be simulated, such as full closure, incomplete closure, or increased contact gap. The degree of wear of the moving contact can also be controlled in the test to study its influence on the propagation and distribution of the vibration signal. This flexible state adjustment function enables the system to simulate and analyze the vibration signal characteristics of the GIS disconnector under various working conditions.

[0042] The vibration sensor 3 is another important component of the system, which is responsible for capturing and measuring the vibration signal around the disconnector 23. The number of vibration sensors 3 should be multiple, usually configured as 12, distributed in different positions of the GIS equipment housing. Figure 4Each group of four vibration sensors 3 is installed in the four directions of the top, bottom, left, and right of a certain cross section of the GIS equipment housing to ensure that the spatial coverage of signal acquisition is comprehensive. The precise installation and reliable adhesion of the vibration sensor 3 are the key to ensuring the accuracy of the measurement data. The vibration sensor 3 is deployed at the insulator 21 connecting the cavity where the disconnector 23 is located and other cavities. The vibration sensor 3 is deployed in Figure 3 At the three collection surfaces A, B, and C, the first collection surface A is close to the X-axis horizontal busbar 24, the second collection surface B is close to the moving contact side of the moving contact operating box 22, and the third collection surface C is close to the Z-axis vertical busbar 26. For example, in the horizontal busbar, vertical busbar, and cavity direction of the moving contact operating box, four vibration sensors 3 are installed in a circular distribution in each direction. The vibration sensor 3 can detect and record vibration signals within a frequency range of 4 kHz. This frequency range covers the main vibration characteristic signals that may be generated by the GIS disconnector. The circular distributed installation of multiple vibration sensors 3 realizes the synchronous measurement of the vibration signal of the GIS disconnector 23. The distributed measurement of multiple sensors can not only improve the spatial resolution of signal acquisition, but also more comprehensively capture the vibration information of various areas on the surface of the equipment to ensure the accuracy and comprehensiveness of the data.

[0043] The signal acquisition device is connected to the vibration sensor 3 and is responsible for the acquisition, processing and recording of all vibration signals. The signal acquisition device has high-precision data acquisition capabilities, can accurately sample multi-band signals, and synchronously control all vibration sensors to ensure that all sensors collect data at the same time. This synchronous acquisition function is crucial for subsequent signal analysis, ensuring that data from different sensors can be compared and analyzed under the same time reference.

[0044] The test system of the present invention allows for flexible simulation of vibration conditions of GIS disconnectors in different states by adjusting the closing distance of the moving contact, setting different contact wear levels, and adjusting different test currents. This state adjustable function enables the test system to simulate and study various possible fault states, which helps develop more complete fault diagnosis algorithms and strategies.

[0045] The test system of the present invention integrates the functions of vibration sensing, data collection and analysis and processing, is easy to operate, and has a high degree of system integration. Compared with the existing technology that requires the cooperation of multiple independent devices, the present invention improves the convenience of operation while also reducing the deployment cost and maintenance difficulty of the system.

[0046] Example 2

[0047] This embodiment also relates to a vibration test method for a GIS disconnector, comprising:

[0048] Before the test, it is necessary to ensure that all equipment and components are connected properly, the vibration sensor 3 is firmly installed, and the signal acquisition device is calibrated. Then, by adjusting the current setting of the current booster 1, the vibration test of the GIS disconnector 23 is prepared under different current conditions.

[0049] During the test, the state of the GIS disconnector 23 is first set, including different closing distances and wear degrees of the moving contact. Then, in each state, different working currents are applied to the GIS equipment circuit through the current booster 1, and the vibration signals measured by all vibration sensors 3 are recorded synchronously. These signal data will serve as the basis for subsequent analysis.

[0050] The test data analysis adopts a multi-dimensional signal analysis method, including time domain analysis, frequency domain analysis, time-frequency domain analysis and spatial distribution analysis:

[0051] Time domain analysis mainly focuses on the time series characteristics of vibration signals, such as vibration amplitude, waveform changes, etc., to help identify the time characteristics of abnormal vibrations.

[0052] Frequency domain analysis uses Fourier transform and other technical means to analyze the spectrum characteristics of the vibration signal and identify the main frequency components and their harmonics in the signal in order to determine the mechanical state of the disconnector.

[0053] Time-frequency domain analysis uses techniques such as short-time Fourier transform (STFT) or wavelet transform to observe the changes in vibration signals in time and frequency, especially the dynamic changes in signal characteristics over time, to help locate possible fault points.

[0054] Spatial distribution analysis studies the propagation and distribution of vibration signals at different locations of the GIS shell by integrating the measurement data of different vibration sensors 3, so as to more accurately identify the location of the vibration source and abnormal patterns.

[0055] The present invention conducts in-depth analysis of the collected vibration signals through multi-dimensional analysis methods such as time domain, frequency domain, time-frequency domain and spatial distribution. Compared with the single-dimensional analysis method in the prior art, the present invention can more comprehensively reflect the operating status of the GIS disconnector, especially with higher accuracy for the identification of complex mechanical faults.

[0056] Through the system and method of the present invention, the propagation characteristics of the vibration signal of the GIS disconnector can be fully obtained, and how the signal propagates on the GIS equipment housing can be understood, including phenomena such as signal attenuation, reflection and pattern recognition. In addition, the system can also analyze the distribution characteristics of the vibration signal, identify the source and pattern of abnormal vibration on the surface of the equipment, and ultimately provide important data support for the status monitoring and fault diagnosis of the GIS disconnector.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A vibration test system for a GIS disconnector, characterized in that: The system comprises a flow riser (1), a GIS equipment loop and a plurality of vibration sensors (3); The current booster (1) is sleeved on the housing of the GIS equipment circuit to provide working currents of different magnitudes for the GIS equipment circuit; The GIS equipment loop includes a complete GIS equipment, including an insulator (21) and a GIS disconnector (23); Each group of vibration sensors (3) is deployed at an insulator (21) connecting the cavity where the GIS disconnector (23) is located with other cavities, and is responsible for capturing and measuring vibration signals around the GIS disconnector (23).

2. A vibration test system for a GIS disconnector according to claim 1, characterized in that: The GIS equipment circuit also includes a moving contact operation box (22) connected to the GIS isolating switch (23); The moving contact operation box (22) is used to adjust the moving contact closing distance and the degree of wear of the moving contact, and to simulate different closing states of the GIS disconnector (23).

3. A vibration test system for GIS disconnector according to claim 2, characterized in that: The GIS disconnector (23) includes states of complete closure, incomplete closure and increased contact gap.

4. A vibration test system for GIS disconnector according to claim 1, characterized in that: The GIS disconnector (23) is deployed at each busbar connection, at the connection between the busbar and each component, or at the connection between each component, wherein each busbar includes an X-axis horizontal busbar (24), a Y-axis horizontal busbar (25) and a Z-axis vertical busbar (26), and wherein each component includes an insulator (21), a voltage transformer, a CT current transformer, a lightning arrester and a circuit breaker.

5. A vibration test system for GIS disconnector according to claim 1, characterized in that: Each group of vibration sensors (3) is installed in a circular distributed manner at four locations of the top, bottom, left, and right of a certain cross section of the loop housing of the GIS equipment.

6. A vibration test system for GIS disconnector according to claim 5, characterized in that: The number of the vibration sensors (3) in each group is four.

7. A vibration test system for GIS disconnector according to claim 1, characterized in that: The current booster (1) adopts a through-hole design and applies working currents of different magnitudes to the GIS equipment loop based on the principle of electromagnetic induction.

8. A vibration test system for GIS disconnector according to claim 1, characterized in that: The system also comprises a signal acquisition device connected to the vibration sensor (3) and used for acquiring, processing and recording vibration signals of all vibration sensors (3).

9. A method for using the vibration test system of the GIS disconnector according to any one of claims 1 to 8, characterized in that: The method includes: Step S1, adjusting the current of the current booster (1); Step S2, adjusting the moving contact operation box (22), setting different states of the GIS isolating switch (23), and synchronously recording the vibration signals measured by all vibration sensors (3) in different states of the GIS isolating switch (23) when the current current is applied to the GIS equipment circuit; Step S3, repeating steps S1 to S2, adjusting the current of the current booster (1), and testing the corresponding vibration signals under different working conditions until the test is completed and then exiting.

10. The method according to claim 9, characterized in that The method also includes ensuring, before the test, that all devices and components on the GIS equipment loop are properly connected, that the vibration sensor (3) is securely installed, and that the signal acquisition device is calibrated.

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