Porcelain post insulator intelligent live detection system and method based on vibration principle

Abstract

The invention relates to the technical field of electric power, in particular to a porcelain post insulator intelligent live detection system and method based on a vibration principle. The DSP microprocessor is connected with the signal excitation source module, the synchronous trigger module, the data acquisition module and the finite element module, the synchronous trigger module is connected with the signal excitation source module and the data acquisition module, the signal excitation source module is connected with the power amplification module, the power amplification module is connected with the transmitting probe, and the data acquisition module is connected with the receiving probe. A transmitting probe and a receiving probe abut against a porcelain post insulator, the transmitting probe is used for transmitting a vibration load to the porcelain post insulator, the receiving probe is used for receiving the vibration acceleration of the porcelain post insulator and sending the vibration acceleration to a DSP microprocessor, and the DSP microprocessor processes received data and sends the data to a finite element module to obtain a detection result. Through a vibration acoustic detection mode, the test speed is high, the detection rate is high, and live detection can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power. Background Art

[0002] Pillar porcelain insulators are important components of power plants and substations. They are widely used in power systems to support conductors, circuit breakers and high-voltage switches. Once a pillar insulator ages, fails or breaks, it often causes damage to circuit breakers and high-voltage switches, leading to large-scale short circuits, grounding, and even casualties of nearby workers. It is often necessary to inspect the condition of the pillar insulators. However, currently, manual inspection is required when the pillar insulators are powered off, which has low inspection efficiency and low detection rate. Summary of the invention

[0003] In order to solve the technical feature that the specific defect position of the insulator cannot be determined in the prior art, the present invention provides an intelligent live detection system and method for porcelain post insulators based on the vibration principle.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0005] The invention relates to an intelligent live detection system for porcelain post insulators based on the vibration principle. The DSP microprocessor is connected to a signal excitation source module, a synchronous trigger module, a data acquisition module and a finite element module. The synchronous trigger module is connected to the signal excitation source module and the data acquisition module. The signal excitation source module is connected to a power amplifier module. The power amplifier module is connected to a transmitting probe. The data acquisition module is connected to a receiving probe. The DSP microprocessor is used for processing the received vibration acceleration data and sending it to the finite element module. The finite element module is used for obtaining the detection result according to the received data. The signal excitation source module is used for sending an excitation signal to the porcelain post insulator. The data acquisition module is used for receiving the vibration acceleration data of the porcelain post insulator and transmitting it to the DSP microprocessor. The synchronous trigger module is used for triggering the data acquisition module and the signal excitation source module to run synchronously.

[0006] The data acquisition module is connected to the signal conditioning module, and the signal conditioning module is connected to the receiving probe; the signal conditioning module is used to filter the noise of the collected data.

[0007] The DSP microprocessor is connected to the storage module, the liquid crystal screen, the speaker and the indicator light.

[0008] The method implemented by the intelligent live detection system for porcelain post insulators based on the vibration principle comprises the following steps:

[0009] S1. Establish a structural model of a porcelain post insulator and import the structural model into a finite element module;

[0010] S2. Select material parameters and vibration input of the structural model through the finite source module to establish a defect spectrum database of porcelain post insulators;

[0011] S3. Formulate defect determination principles based on the porcelain post insulator defect spectrum database;

[0012] S4. The transmitting probe and the receiving probe are placed against the porcelain post insulator, the transmitting probe is used to transmit the vibration load to the porcelain post insulator, and the receiving probe is used to receive the vibration acceleration of the porcelain post insulator and send it to the DSP microprocessor;

[0013] S5. The DSP microprocessor digitizes the received vibration acceleration to generate a digital audio signal, and sends the digital audio signal to the finite element module;

[0014] S6. The finite element module performs Fourier transform on the digital audio signal to generate a frequency domain characteristic diagram, and obtains the judgment and detection results of the porcelain post insulator according to the defect judgment principle.

[0015] The calculation formula for establishing the porcelain post insulator defect spectrum database in step S2 is as follows:

[0016]

[0017] Where: E is the elastic modulus, F is the cross-sectional area, q is the applied load, u is the displacement, u is a function of position x and time t, and ρ is the density of the elastic body.

[0018] The step S3 formulates the defect determination principle according to the porcelain post insulator defect spectrum database as follows:

[0019] When the frequency domain of the obtained porcelain post insulator frequency domain characteristic diagram has a highest value only in the 3500-5500HZ frequency band, the porcelain post insulator is judged to be qualified;

[0020] When the frequency domain of the obtained porcelain post insulator frequency domain characteristic diagram has the highest value in the 1000-3500HZ frequency band, it is judged that there is a defect in the lower part of the porcelain post insulator;

[0021] When the frequency domain of the obtained frequency domain characteristic diagram of the porcelain post insulator has the highest value in the frequency band of 5500-10000HZ, it is judged that there is a defect in the upper part of the porcelain post insulator.

[0022] The advantages of the present invention compared with the prior art are:

[0023] Place the transmitting probe and the receiving probe against the porcelain post insulator, use the transmitting probe to transmit the vibration load to the porcelain post insulator, use the receiving probe to receive the vibration acceleration of the porcelain post insulator and send it to the DSP microprocessor, the DSP microprocessor processes the received data and sends it to the finite element module to obtain the test results. Through the vibration acoustic detection method, the test speed is fast, the detection rate is high, and live detection is possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the system of the present invention;

[0025] Figure 2 is a flow chart of the method of the present invention;

[0026] Figure 3 It is a frequency domain diagram of the test result of the present invention to judge the insulator under normal conditions;

[0027] Figure 4 It is a frequency domain diagram of the detection result of the present invention when judging the defect of the lower part of the insulator.

[0028] Figure 5 It is a frequency domain diagram of the detection result of the present invention when judging the defects on the upper part of the insulator. DETAILED DESCRIPTION

[0029] The invention provides a porcelain post insulator intelligent live detection system based on the vibration principle, such as Figure 1 As shown, the DSP microprocessor is connected to the signal excitation source module, the synchronous trigger module, the data acquisition module and the finite element module, the synchronous trigger module is connected to the signal excitation source module and the data acquisition module, the signal excitation source module is connected to the power amplifier module, the power amplifier module is connected to the transmitting probe, the DSP microprocessor is used to process the received vibration acceleration data and send it to the finite element module, the finite element module is used to obtain the detection result according to the received data, the signal excitation source module is used to send an excitation signal to the porcelain support insulator, the data acquisition module is used to receive the vibration acceleration data of the porcelain support insulator and transmit it to the DSP microprocessor, the synchronous trigger module is used to trigger the data acquisition module and the signal excitation source module to run synchronously; the data acquisition module is connected to the signal conditioning module, the signal conditioning module is connected to the receiving probe, and the noise of the signal received by the receiving probe is filtered through the signal conditioning module. The finite element module includes a laptop and a USB interface circuit, the laptop is connected to the USB interface circuit, the USB interface circuit is connected to the DSP circuit, and the laptop is equipped with ABAQUS engineering simulation finite element software. The DSP microprocessor is connected to the storage module, the LCD screen, the speaker and the indicator light, which are used to store data and indicate the detection results.

[0030] The method is performed by using an intelligent live detection system for porcelain post insulators based on the vibration principle, such as Figure 2 As shown, the following steps are included:

[0031] S1. Establish a CAD structural model of the porcelain post insulator by surveying and mapping, and import the CAD structural model into the finite element software ABAQUS engineering simulation in the finite element module in the form of a data file;

[0032] S2. Select the material parameters of the porcelain body, adhesive, and cast iron of the structural model through the finite element software of ABAQUS engineering simulation in the finite source module, simulate the characteristics of the received signals of defects of different types and positions under different vibration inputs, and establish a defect spectrum database of porcelain post insulators accordingly;

[0033] The calculation formula for establishing the defect spectrum database of porcelain post insulators is as follows:

[0034]

[0035] Where: E is the elastic modulus, F is the cross-sectional area, q is the applied load, u is the displacement, u is a function of position x and time t, and ρ is the density of the elastic body of the insulator.

[0036] Each order of vibration frequency is the eigenvalue of the vibration differential equation, and the vibration mode is the eigenvector corresponding to the eigenvalue. By applying a variety of excitation signals, the vibration mode of the pillar porcelain insulator medium is controlled, and the propagation and modulation law of the spectrum of the applied signal in the insulator are studied from the perspective of elastic dynamics.

[0037] S3. Develop defect determination principles based on the porcelain post insulator defect spectrum database, such as Figure 3-5 As shown:

[0038] When the frequency domain of the obtained porcelain post insulator frequency domain characteristic diagram has a highest value only in the 3500-5500HZ frequency band, the porcelain post insulator is judged to be qualified;

[0039] When the frequency domain of the obtained porcelain post insulator frequency domain characteristic diagram has the highest value in the 1000-3500HZ frequency band, and the waveforms in other frequency bands are smooth, it is judged that there is a defect in the lower part of the porcelain post insulator;

[0040] When the frequency domain characteristic diagram of the obtained porcelain post insulator has the highest value in the 5500-10000HZ frequency band, and the waveforms in other frequency bands are smooth, it is judged that there is a defect in the upper part of the porcelain post insulator;

[0041] When the highest frequency value of the frequency domain characteristic graph is between 3500 and 5500 Hz and there is a second highest value on the graph and this value is close to the highest value, the "logarithm" function can be used to make further refined judgments.

[0042] S4. Place the transmitting probe and the receiving probe against the appropriate position of the porcelain post insulator, use the transmitting probe to transmit the vibration load to the porcelain post insulator, use the receiving probe to receive the vibration acceleration of the porcelain post insulator and send it to the DSP microprocessor, and there will be sound and light prompts when the DSP microprocessor starts to collect data and when the collection ends;

[0043] S5. The DSP microprocessor digitizes the received vibration acceleration to generate a digital audio signal and stores it in the storage module, and sends the digital audio signal to the finite element module;

[0044] S6. The finite element software of ABAQUS engineering simulation in the finite element module performs Fourier transform on the digital audio signal to generate a frequency domain characteristic diagram which is displayed on the LCD screen, and obtains the judgment and detection results of the porcelain post insulator according to the defect judgment principle. Through the vibration acoustic detection method, not only the detection efficiency and accuracy are high, but also the specific location of the defect of the insulator can be obtained.

[0045] The present invention is described by way of embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present invention.

Claims

1. The intelligent live detection system for porcelain post insulators based on the vibration principle is characterized by: The DSP microprocessor is connected to the signal excitation source module, the synchronous trigger module, the data acquisition module and the finite element module. The synchronous trigger module is connected to the signal excitation source module and the data acquisition module. The signal excitation source module is connected to the power amplifier module. The power amplifier module is connected to the transmitting probe, and the data acquisition module is connected to the receiving probe. The DSP microprocessor is used to process the received vibration acceleration data and send it to the finite element module. The finite element module is used to obtain the detection result according to the received data. The signal excitation source module is used to send an excitation signal to the porcelain post insulator. The data acquisition module is used to receive the vibration acceleration data of the porcelain post insulator and transmit it to the DSP microprocessor. The synchronous trigger module is used to trigger the data acquisition module and the signal excitation source module to run synchronously.

2. The intelligent live detection system for porcelain post insulators based on the vibration principle according to claim 1 is characterized in that: The data acquisition module is connected to the signal conditioning module, and the signal conditioning module is connected to the receiving probe; the signal conditioning module is used to filter the noise of the collected data.

3. The intelligent live detection system for porcelain post insulators based on vibration principle according to claim 1 is characterized in that: The DSP microprocessor is connected to the storage module, the liquid crystal screen, the speaker and the indicator light.

4. The method implemented by the intelligent live detection system for porcelain post insulators based on the vibration principle is characterized in that: The following steps are involved: Establish the structural model of porcelain post insulator; Select the material parameters and vibration input of the structural model and establish the defect spectrum database of porcelain post insulators; Formulate defect determination principles based on the porcelain post insulator defect spectrum database; The transmitting probe is used to transmit the vibration load to the porcelain post insulator, and the receiving probe is used to receive the vibration acceleration of the porcelain post insulator; The received vibration acceleration is digitized to generate a digital audio signal, and the digital audio signal is sent to the finite element module; The digital audio signal is transformed into a frequency domain feature map by Fourier transform, and the judgment and detection results of the porcelain post insulator are obtained according to the defect judgment principle.

5. The intelligent live detection method for porcelain post insulators based on vibration principle according to claim 4 is characterized in that: The calculation formula for establishing the defect spectrum database of porcelain post insulators is as follows: Where: E is the elastic modulus, F is the cross-sectional area, q is the applied load, u is the displacement, u is a function of position x and time t, and ρ is the density of the elastic body.

6. The intelligent live detection method for porcelain post insulators based on vibration principle according to claim 4 is characterized in that: The steps are as follows: When the frequency domain of the obtained porcelain post insulator frequency domain characteristic diagram has a highest value only in the 3500-5500HZ frequency band, the porcelain post insulator is judged to be qualified; When the frequency domain of the obtained porcelain post insulator frequency domain characteristic diagram has the highest value in the 1000-3500HZ frequency band, it is judged that there is a defect in the lower part of the porcelain post insulator; When the frequency domain of the obtained frequency domain characteristic diagram of the porcelain post insulator has the highest value in the frequency band of 5500-10000HZ, it is judged that there is a defect in the upper part of the porcelain post insulator.

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