Post insulator live detection device based on mechanical pulse excitation
By designing a live detection device for pillar insulators based on mechanical pulse excitation, the problem of difficulty in detecting high-position insulators in the prior art is solved, and convenient and efficient detection is achieved, reducing manpower burden and improving detection accuracy.
Patent Information
- Application Number
- CN202411960661.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-04-08
AI Technical Summary
The prior art is difficult to effectively detect pillar insulators in operation at high positions, especially in the charged state, which is difficult to operate and easily affected by human operation.
A pillar insulator live detection device based on mechanical pulse excitation is designed, including a fixed part, a rotating part and a detection part. The fixing member is fixed to the mounting column on the lower side of the flange under the pillar insulator, and vibration detection is performed using the rotating member and the detection member. The detection member includes a housing, an excitation unit, a vibration pickup unit and a control chip. The detection position can be automatically adjusted and multiple detections can be performed to improve accuracy.
It realizes convenient detection of high-level insulators, reduces manpower burden, improves detection accuracy and efficiency, and can conduct inspections without being affected by human operations.
Smart Images
Figure CN119780240A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of insulator detection, in particular to a post insulator live detection device based on mechanical pulse excitation. Background Art
[0002] As a key insulating component of the power system, porcelain post insulators are prone to defects such as entrapment, pores, and microcracks due to the influence of various factors such as production process, material stress, and operating environment, which can lead to fractures, power outages, and secondary power disasters, causing immeasurable losses. The development of live detection technology for porcelain post insulator defects based on mechanical excitation can timely grasp the operating status and avoid power outages, which is crucial to comprehensively improve the safe operation level of the power grid.
[0003] The vibration acoustic method is a relatively new non-destructive flaw detection method in recent years. Compared with other mechanical flaw detection methods for pillar porcelain insulators, it has the advantages of short detection time, live operation, and no influence from the corona voltage on the top of the insulator. It can accurately detect cracks near the upper and lower flanges. In practical applications, different excitation signals can be used to excite the bottom of the lower flange of the insulator, extract the vibration point signal and perform post-processing, analyze and obtain the power spectrum density diagram of the insulator, and judge the change of the insulator performance by the natural frequency range. At present, a force hammer is usually used to simulate the mechanical pulse signal. Due to the high position of the insulator, the force hammer excitation is difficult to operate in actual live detection and is easily affected by human operation.
[0004] For example, a post insulator vibration flaw detection and live detection device disclosed in the patent document with publication number CN 118671190 A includes a base, a rotating disk is rotatably arranged on the base, the rotating disk is used to place the insulator, and a detection rod is also arranged on the base, the detection rod is used to knock the insulator, and the post insulator vibration flaw detection and live detection device is provided with a fixing mechanism on the rotating disk, the fixing mechanism includes an outer fixing plate slidably arranged on the rotating disk, and there are several outer fixing plates, and inner connecting plates are arranged between the several outer fixing plates, and each outer fixing plate is slidably arranged on the inner connecting plate, and the outer fixing plate is used to fix the bottom of the insulator, so as to adaptively clamp the bottom of the insulator to achieve a more stable and fixed effect, thereby avoiding the displacement of the center position of the insulator during the knocking detection. However, this invention can only be used for insulators that have not been installed, and cannot be used for live detection of post insulators in operation. Summary of the invention
[0005] In view of this, the present invention aims at the deficiencies in the prior art and provides a post insulator live detection device based on mechanical pulse excitation.
[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a post insulator live detection device based on mechanical pulse excitation, comprising a fixed component, a rotating component and a detection component, the rotating component is arranged on the fixed component, and the detection component is arranged on the rotating component; the detection component comprises a shell, an excitation unit, a vibration pickup unit and a control chip, and the excitation unit and the vibration pickup unit are both connected to the control chip signal.
[0007] Furthermore, the fixing component includes a mounting block, an arc-shaped clamping jaw, a screw rod and a motor. A cavity is arranged inside the mounting block. The screw rod is rotatably arranged in the cavity. The screw rod is connected to the motor for transmission. A strip hole is arranged on one side of the cavity. One end of the two arc-shaped clamping jaws enters the cavity from the strip hole and are respectively threadedly connected to both sides of the screw rod. The threads on both sides of the screw rod are opposite.
[0008] Furthermore, the rotating component comprises a semicircular guide rail and a sliding mounting seat, the semicircular guide rail is arranged on the mounting block, the sliding mounting seat is slidably arranged on the semicircular guide rail, and the housing is arranged on the sliding mounting seat.
[0009] Furthermore, the excitation unit includes a pulse exciter, a transmitting probe, a booster, an amplifier and a filter, and the transmitting probe, pulse exciter, booster, amplifier and filter are signal-connected in sequence, and the filter is signal-connected to the control chip; the vibration pickup unit includes a vibration sensor, a receiving probe, a programmable gain amplifier and an analog-to-digital converter, and the receiving probe, vibration sensor, programmable gain amplifier and analog-to-digital converter are signal-connected in sequence, and the analog-to-digital converter is signal-connected to the control chip.
[0010] Furthermore, the transmitting probe and the receiving probe are arranged in parallel on one side of the shell.
[0011] Furthermore, a propulsion component is arranged between the sliding mounting seat and the shell, and the propulsion component includes a linear slide rail, a sliding block and an electric telescopic rod. The linear slide rail is arranged on the sliding mounting seat, the sliding block is slidably arranged on the linear slide rail, the shell is arranged on the sliding block, the electric telescopic rod is fixed at one end of the linear slide rail, and the telescopic end is connected to the sliding block.
[0012] Furthermore, it also includes an insulating rod, the upper end of which is connected to the mounting block.
[0013] Furthermore, a rubber cushion layer is provided on the inner side of the two arc-shaped clamping jaws.
[0014] Furthermore, it also includes a secondary control chip, and the sliding mounting seat, the motor and the electric telescopic rod are all connected to the secondary control chip signal.
[0015] Furthermore, it also includes a wireless communication module, and the control chip and the auxiliary control chip are both connected to the wireless communication module by signal.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] 1. The post insulator live detection device based on mechanical pulse excitation of the present invention uses a fixing component to fix the device on the mounting column on the lower side of the lower flange of the post insulator, and then performs vibration detection. On the one hand, during the detection, no manpower is required to support it through the insulating rod, which reduces manpower. On the other hand, it can ensure the stability of the detection component and improve the detection accuracy. Moreover, after the device is transferred to the post insulator to be tested through the insulating rod or the drone, the motor is started, the screw rod rotates, and the two arc-shaped clamps are brought close to each other for clamping, which is easy to operate.
[0018] 2. The post insulator live detection device based on mechanical pulse excitation of the present invention has a detection component arranged on the fixed component through a rotating component, so that the detection component can rotate with the rotating component, thereby facilitating adjustment of the detection position, and improving the detection accuracy through multiple different position detections. Moreover, the rotating component adopts a semicircular guide rail, and the sliding mounting seat rotates along the semicircular guide rail in a self-driven manner, so that the position of the detection component can be adjusted conveniently and quickly.
[0019] 3. The present invention is a post insulator live detection device based on mechanical pulse excitation. In the detection component, the tips of the transmitting probe and the receiving probe are vertically pressed against the lower flange of the porcelain post insulator to be tested. After a certain period of time, the control chip starts the test: first, the control chip controls the pulse exciter to generate a vibration signal. At the same time, the vibration frequency of the porcelain post insulator is collected by a vibrating string sensor, and the vibration frequency is converted into digital form and stored in a memory. It is then transmitted to a computer terminal for analysis and processing. The signal data is analyzed by a computer to determine whether the post insulator has a crack defect.
[0020] 4. In the post insulator live detection device based on mechanical pulse excitation of the present invention, a propulsion component is arranged between the rotating component and the detection component, which is used to enable the tips of the transmitting probe and the receiving probe of the detection component to contact with the lower flange of the porcelain post insulator to be tested after the fixed component is fixed on the post insulator; moreover, the propulsion component adopts a linear slide rail, a sliding block and an electric telescopic rod, which has fast movement and sensitive control; in addition, the propulsion component, the fixed component and the rotating component are all controlled by the auxiliary control chip, and are interconnected with the ground operation terminal signal through the wireless communication module, so that the detection personnel can conveniently control the fixed component, the rotating component and the propulsion component on the ground, and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1It is a schematic diagram of the use state of the present invention;
[0022] Figure 2 is a front view of an embodiment of the present invention;
[0023] Figure 3 is a top view of an embodiment of the present invention;
[0024] Figure 4 is a cross-sectional view of a fixing component in an embodiment of the present invention;
[0025] Figure 5 is a circuit connection diagram of an embodiment of the present invention;
[0026] In the figure: 1-lower flange of support insulator, 2-mounting column, 3-fixed component, 4-rotating component, 5-detection component, 31-mounting block, 32-arc-shaped clamping claw, 33-screw rod, 34-rubber cushion, 41-semicircular guide rail, 42-sliding mounting seat, 51-housing, 52-transmitting probe, 53-receiving probe, 61-linear slide rail, 62-sliding block, 63-electric telescopic rod. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.
[0028] Example 1: Figures 1 to 4 As shown, an embodiment of the present invention provides a post insulator live detection device based on mechanical pulse excitation, which is used for high-position in-service post insulator detection. The device is installed on the mounting column 2 on the lower side of the lower flange 1 of the post insulator, and detection is achieved by pulse vibrating the lower flange 1 of the post insulator.
[0029] It includes a fixed component 3, a rotating component 4 and a detection component 5. The rotating component 4 is arranged on the fixed component 3, and the detection component 5 is arranged on the rotating component 4; the detection component 5 includes a shell 51, an excitation unit, a vibration pickup unit and a control chip, and the excitation unit and the vibration pickup unit are both connected to the control chip signal.
[0030] Specifically, the fixing component 3 includes a mounting block 31, an arc-shaped clamping jaw 32, a screw rod 33 and a motor. A cavity is arranged inside the mounting block 31, and the screw rod 33 is rotatably arranged in the cavity. The screw rod 33 is connected to the motor for transmission. A strip hole is arranged on one side of the cavity. One end of the two arc-shaped clamping jaws 32 enters the cavity from the strip hole and is respectively threadedly connected to the two sides of the screw rod 33. The threads on both sides of the screw rod 33 are opposite. Rubber pads 34 are arranged on the inner sides of the two arc-shaped clamping jaws 32.
[0031] The rotating component 4 includes a semicircular guide rail 41 and a sliding mounting seat 42 . The semicircular guide rail 41 is arranged on the mounting block 31 . The sliding mounting seat 42 is slidably arranged on the semicircular guide rail 41 . The housing 51 is arranged on the sliding mounting seat 42 .
[0032] The excitation unit includes a pulse exciter, a transmitting probe 52, a booster, an amplifier and a filter, and the transmitting probe, pulse exciter, booster, amplifier and filter are signal-connected in sequence, and the filter is signal-connected to the control chip; the vibration pickup unit includes a vibration sensor, a receiving probe 53, a programmable gain amplifier and an analog-to-digital converter, and the receiving probe, vibration sensor, programmable gain amplifier and analog-to-digital converter are signal-connected in sequence, and the analog-to-digital converter is signal-connected to the control chip.
[0033] The transmitting probe 52 and the receiving probe 53 are arranged in parallel on one side of the housing 51 .
[0034] A propulsion component is arranged between the sliding mounting seat 42 and the shell 51, and the propulsion component includes a linear slide rail 61, a sliding block 62 and an electric telescopic rod 63. The linear slide rail 61 is arranged on the sliding mounting seat 42, the sliding block 62 is slidably arranged on the linear slide rail 61, the shell 51 is arranged on the sliding block 62, and the electric telescopic rod 63 is fixed at one end of the linear slide rail 61, and the telescopic end is connected to the sliding block 62.
[0035] In other embodiments, an insulating rod is further included, and the upper end of the insulating rod is connected to the mounting block 31. The post insulator live detection device based on mechanical pulse excitation can be moved to the vicinity of the post insulator located at a high position through the insulating rod. Of course, the post insulator live detection device based on mechanical pulse excitation of the present invention can also be moved by a drone for use in detecting post insulators at a higher position.
[0036] In other embodiments, a secondary control chip and a wireless communication module are also included, the sliding mounting seat 42, the motor and the electric telescopic rod 63 are all connected to the secondary control chip signal, and the control chip and the secondary control chip are both connected to the wireless communication module signal. The control chip and the secondary control chip are wirelessly connected to the operating terminal of the ground detection personnel through the wireless communication module to receive the vibration data transmitted by the control chip, and control the fixed component, the rotating component, the propulsion component and the detection component.
[0037] The control chip adopts the STM32F4 series microcontroller produced by ST, which is based on the ARM architecture, the Cortex-M4 core, and the main frequency is as high as 180MHZ. It has good performance in both power consumption and performance. In order to meet the characteristics of mobile storage and on-the-go testing and viewing, the circuit part also integrates U disk, SD card storage circuit, and WiFi wireless transmission circuit.
[0038] The computer background software needs to be able to display the waveform of the vibration signal in the time domain and frequency domain, and can perform certain operations such as cleaning, filtering, and normalization on the data. The overall interface is planned to be written in Python language, and the design includes the login interface and the main interface. The login interface should include functions such as file import, database detection, database management, and intelligent judgment. It can process data and output time domain, frequency domain, and filtered frequency domain graphs, and can determine the insulator fault location based on the peak distribution of the filtered frequency graph and output it for display.
[0039] The post insulator live detection device based on mechanical pulse excitation of the present invention is transferred to the lower flange of the post insulator to be tested by an insulating rod or a drone, and the ground personnel send instructions, the auxiliary control chip controls the motor to start, the screw starts to rotate, so that the two arc-shaped clamps are close to each other and clamped on the mounting column on the lower side of the lower flange of the insulator, and then the auxiliary control chip controls the electric telescopic rod to extend, so that the tips of the transmitting probe and the receiving probe of the detection component are vertically attached to the lower flange of the porcelain post insulator to be tested. After a certain period of time, the control chip starts the test work: first, the control chip controls the pulse exciter to generate a vibration signal, and at the same time, the vibration frequency of the porcelain post insulator is collected by a vibrating string sensor, and the vibration frequency is converted into analog and stored in a memory, and then transmitted to a computer terminal for analysis and processing, and the signal data is analyzed by the computer to determine whether the post insulator has a crack defect. When it is detected that the post insulator has a defect, the auxiliary control chip controls the sliding mounting seat to rotate a certain angle along the semicircular guide rail, and the detection component is started again for detection to confirm whether there is a defect, thereby improving the detection accuracy. The present invention solves the problem of detection convenience of high-position in-service pillar insulators, greatly saves the manpower and material resources of detection personnel, improves detection efficiency, and ensures higher detection accuracy, and has good application prospects.
[0040] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art can still modify or make equivalent substitutions to the specific implementations of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention to be approved.
Claims
1. A post insulator live detection device based on mechanical pulse excitation, characterized in that: It includes a fixed component, a rotating component and a detection component, the rotating component is arranged on the fixed component, and the detection component is arranged on the rotating component; the detection component includes a shell, an excitation unit, a vibration pickup unit and a control chip, and the excitation unit and the vibration pickup unit are both connected to the control chip signal.
2. The post insulator live detection device based on mechanical pulse excitation according to claim 1 is characterized in that: The fixing component includes a mounting block, an arc-shaped clamping jaw, a screw rod and a motor. A cavity is arranged inside the mounting block. The screw rod is rotatably arranged in the cavity. The screw rod is connected to the motor for transmission. A strip hole is arranged on one side of the cavity. One end of the two arc-shaped clamping jaws enters the cavity from the strip hole and are respectively threadedly connected to the two sides of the screw rod. The threads on the two sides of the screw rod are opposite.
3. The post insulator live detection device based on mechanical pulse excitation according to claim 2 is characterized in that: The rotating component comprises a semicircular guide rail and a sliding mounting seat. The semicircular guide rail is arranged on the mounting block. The sliding mounting seat is slidably arranged on the semicircular guide rail. The housing is arranged on the sliding mounting seat.
4. The post insulator live detection device based on mechanical pulse excitation according to claim 3 is characterized in that: The excitation unit includes a pulse exciter, a transmitting probe, a booster, an amplifier and a filter. The transmitting probe, pulse exciter, booster, amplifier and filter are connected in sequence, and the filter is connected in sequence with the control chip; the vibration pickup unit includes a vibration sensor, a receiving probe, a programmable gain amplifier and an analog-to-digital converter. The receiving probe, vibration sensor, programmable gain amplifier and analog-to-digital converter are connected in sequence, and the analog-to-digital converter is connected in sequence with the control chip.
5. The post insulator live detection device based on mechanical pulse excitation according to claim 4 is characterized in that: The transmitting probe and the receiving probe are arranged in parallel at one side of the housing.
6. The post insulator live detection device based on mechanical pulse excitation according to claim 3 is characterized in that: A propulsion component is arranged between the sliding mounting seat and the shell, and the propulsion component includes a linear slide rail, a sliding block and an electric telescopic rod. The linear slide rail is arranged on the sliding mounting seat, the sliding block is slidably arranged on the linear slide rail, the shell is arranged on the sliding block, the electric telescopic rod is fixed at one end of the linear slide rail, and the telescopic end is connected to the sliding block.
7. The post insulator live detection device based on mechanical pulse excitation according to claim 2 is characterized in that: It also includes an insulating rod, the upper end of which is connected to the mounting block.
8. The post insulator live detection device based on mechanical pulse excitation according to claim 2 is characterized in that: Rubber cushion layers are arranged on the inner sides of the two arc-shaped clamping jaws.
9. The post insulator live detection device based on mechanical pulse excitation according to claim 6, characterized in that: It also includes a secondary control chip, and the sliding mounting seat, the motor and the electric telescopic rod are all connected to the secondary control chip signal.
10. The post insulator live detection device based on mechanical pulse excitation according to claim 2, characterized in that: It also includes a wireless communication module, and the control chip and the auxiliary control chip are both connected to the wireless communication module by signal.