Porcelain detection method and device for post insulator

Abstract

The invention belongs to the technical field of porcelain detection, and discloses a porcelain detection method and device for a post insulator, and the method comprises the steps: determining a porcelain detection region of a to-be-detected post insulator, and obtaining a to-be-detected region; selecting a plurality of point positions in the to-be-detected area as ultrasonic signal receiving points; ultrasonic probes are installed at preset positions around the post insulator to be detected; transmitting an ultrasonic signal to the to-be-detected area by using the ultrasonic probe, and collecting the ultrasonic signal of the ultrasonic signal receiving point to obtain a received ultrasonic signal; performing real-time beam analysis on the received ultrasonic signal, and obtaining a porcelain type detection result of the post insulator to be detected according to a real-time beam analysis result; according to the method, the purpose of rapidly and accurately judging the porcelain type of the post insulator in real time is achieved according to the real-time wave beam analysis result by utilizing the difference characteristics of the ultrasonic signals in common porcelain and high-strength porcelain, and electric power accidents or faults caused by porcelain problems are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of porcelain detection, and in particular relates to a porcelain detection method and device for a post insulator. Background Art

[0002] Post insulators are important components of power plants and substations, supporting conductors and providing insulation. Their quality directly affects the safety of power supply to the power grid. With the development of power grid technology, in order to ensure the safety of power supply to the power grid, it is required that all high-strength porcelain post insulators be used to avoid the phenomenon of ordinary porcelain insulators being broken during use due to insufficient strength of the porcelain parts, which is caused by their low strength.

[0003] However, due to the high production cost of high-strength porcelain post insulators, some manufacturers in the market still use ordinary porcelain materials to process and produce insulators. Therefore, the quality of the post insulators needs to be tested before use. At present, the quality inspection of post insulators mainly focuses on the detection of defects such as crack characteristics of insulators. For example, China’s patent application “A method for detecting crack characteristics of porcelain insulators based on edge detection (publication number: CN108257138A)”, but the existing detection methods cannot detect the porcelain type of post insulators. It is very easy to use insulators whose porcelain does not meet the requirements in the power grid, causing great safety hazards to the operation of the power grid. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a porcelain detection method and device for post insulators to solve the technical problem that the existing detection means are unable to detect the porcelain type of post insulators, and insulators whose porcelain does not meet the requirements are easily used in power grids, causing great safety hazards to the operation of the power grid.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a porcelain detection method for a post insulator, comprising: Determine the porcelain detection area of ​​the post insulator to be tested to obtain the area to be tested; select several points in the area to be tested as ultrasonic signal receiving points; Installing ultrasonic probes at preset positions around the post insulator to be tested; Using the ultrasonic probe to transmit an ultrasonic signal to the area to be inspected, and collecting the ultrasonic signal at the ultrasonic signal receiving point to obtain a received ultrasonic signal; The received ultrasonic signal is subjected to real-time beam analysis, and a porcelain type detection result of the post insulator to be tested is obtained according to the real-time beam analysis result.

[0006] Furthermore, the surface of the post insulator to be tested is coated with a coupling agent.

[0007] Furthermore, the ultrasonic probe is used to transmit an ultrasonic signal to the area to be inspected, and the ultrasonic signal at the ultrasonic signal receiving point is collected to obtain the receiving point ultrasonic signal; When a first preset load is applied to the post insulator to be tested, the ultrasonic probe is used to transmit an ultrasonic signal to the area to be tested, and the ultrasonic signal at the ultrasonic signal receiving point is collected to obtain a first received ultrasonic signal; When a second preset load is applied to the post insulator to be tested, the ultrasonic probe is used to transmit an ultrasonic signal to the area to be tested, and the ultrasonic signal at the ultrasonic signal receiving point is collected to obtain a second received ultrasonic signal.

[0008] Furthermore, the process of performing real-time beam analysis on the received ultrasonic signal is specifically as follows: Calculating the echo velocity of the ultrasound on the post insulator to be tested under a first preset load state according to the first received ultrasonic signal to obtain a first echo velocity; Calculating the echo velocity of the ultrasound on the post insulator to be tested under a second preset load state according to the second received ultrasonic signal to obtain a second echo velocity; Calculating the acoustoelastic constant of the post insulator to be tested according to the first echo wave velocity and the second echo wave velocity; The acoustoelastic constant of the post insulator to be tested is compared with an acoustoelastic constant threshold to obtain a real-time beam analysis result.

[0009] Furthermore, according to the real-time beam analysis result, the process of obtaining the porcelain type detection result of the post insulator to be tested is as follows: If the acoustic elastic constant of the post insulator to be tested is greater than the acoustic elastic constant threshold, the porcelain type detection result of the post insulator to be tested is high-strength porcelain; otherwise, the porcelain type detection result of the post insulator to be tested is ordinary porcelain.

[0010] Furthermore, before performing real-time beam analysis on the received ultrasonic signal, a signal preprocessing step is also included; The signal preprocessing step is specifically as follows: The first received ultrasonic signal and the second received ultrasonic signal are subjected to noise reduction and impurity removal processing to obtain a preprocessed first received ultrasonic signal and a preprocessed second received ultrasonic signal; wherein the preprocessed first received ultrasonic signal is used to calculate a first echo wave velocity, and the preprocessed second received ultrasonic signal is used to calculate a second echo wave velocity.

[0011] The present invention also provides a porcelain detection device for a post insulator, comprising an ultrasonic probe, an ultrasonic signal acquisition module and a data analysis module; The ultrasonic probe is installed at preset positions around the post insulator to be tested; wherein the ultrasonic probe is used to transmit ultrasonic signals to the area to be tested of the post insulator to be tested, and ultrasonic signal receiving points are predetermined in the area to be tested of the post insulator to be tested; The ultrasonic signal acquisition module is used to acquire the ultrasonic signal of the ultrasonic signal receiving point to obtain a received ultrasonic signal; The data analysis module is used to perform real-time beam analysis on the received ultrasonic signal, and obtain a porcelain type detection result of the post insulator to be tested according to the real-time beam analysis result.

[0012] Furthermore, the ultrasonic probe includes a straight probe, a transverse probe and an oblique probe; the straight probe is vertically arranged above the upper end surface of the post insulator to be measured, and the ultrasonic signal emitted by the straight probe passes through the center of the upper end surface of the post insulator to be measured; the transverse probe is horizontally arranged on the side of the post insulator to be measured; the oblique probe is obliquely arranged above the upper end surface of the post insulator to be measured, and the axial direction of the oblique probe forms an angle of 45° with the upper end surface of the post insulator to be measured.

[0013] Furthermore, the number of ultrasonic signal receiving points is three; wherein the first ultrasonic signal receiving point is located at the center of the upper end surface of the post insulator to be tested; the second ultrasonic signal receiving point is located at the upper end surface of the post insulator to be tested and is offset from the center of the upper end surface of the post insulator to be tested; and the third ultrasonic signal receiving point is located on the outer wall surface of the post insulator to be tested.

[0014] Furthermore, it also includes a load applying device; wherein the load applying device is used to apply a preset load to the post insulator to be tested.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The invention provides a porcelain detection method and device for post insulators. By emitting ultrasonic signals to the area to be inspected and collecting ultrasonic signals at the receiving point for real-time beam analysis, the differential characteristics of ultrasonic signals in ordinary porcelain and high-strength porcelain are utilized, and then based on the results of real-time beam analysis, the purpose of quickly, accurately and real-timely determining the porcelain type of the post insulator is achieved, thereby ensuring that the porcelain of the post insulator meets the requirements, avoiding power accidents or failures caused by porcelain problems, and ensuring the safe operation of the power grid; secondly, the use of non-destructive ultrasonic testing technology can avoid any physical damage to the post insulator during the testing process or affect its normal use, thereby ensuring the safety and integrity of the insulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A flow chart of a porcelain detection method for a post insulator provided in Example 1; Figure 2 Schematic diagram of the distribution structure of the ultrasonic probe in Examples 1 and 2.

[0018] Among them, 1 is the pillar insulator to be tested, 2 is the straight probe, 3 is the horizontal probe, and 4 is the oblique probe. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects solved by this application clearer, the technical solutions in the embodiments of this application will be described clearly and completely in combination with the drawings in the embodiments of this application; obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] Example 1 As attached Figure 1 As shown, this embodiment 1 provides a porcelain detection method for a post insulator, comprising the following steps: Step 1: determine the porcelain detection area of ​​the post insulator 1 to be tested, and obtain the area to be tested; select several points in the area to be tested as ultrasonic signal receiving points.

[0021] The surface of the post insulator 1 to be tested is coated with a coupling agent, and the number of the ultrasonic signal receiving points is three; specifically, taking a cylindrical post insulator as an example, the three ultrasonic signal receiving points are: the first ultrasonic signal receiving point is located at the center of the upper end face of the post insulator 1 to be tested; the second ultrasonic signal receiving point is located at the upper end face of the post insulator 1 to be tested, and is set away from the center of the upper end face of the post insulator 1 to be tested; the third ultrasonic signal receiving point is located on the outer wall of the post insulator 1 to be tested. It should be noted that the process of determining the area to be tested is specifically determined according to the porcelain detection requirements of the post insulator 1 to be tested.

[0022] Step 2: Install ultrasonic probes at preset positions around the post insulator 1 to be tested.

[0023] As attached Figure 2 As shown, there are three ultrasonic probes, specifically including a straight probe 2, a transverse probe 3 and an oblique probe 4; the straight probe 2 is vertically arranged above the upper end surface of the post insulator 1 to be measured, and the straight probe 2 is used to transmit an ultrasonic signal passing through the center of the upper end surface of the post insulator 1 to be measured; the transverse probe 3 is horizontally arranged on the side of the post insulator 1 to be measured, and is used to transmit an ultrasonic signal perpendicular to the outer wall of the post insulator 1 to be measured; the oblique probe 4 is obliquely arranged above the upper end surface of the post insulator 1 to be measured, and the axial direction of the oblique probe 4 forms an angle of 45° with the upper end surface of the post insulator 1 to be measured; it should also be noted that the ultrasonic frequency emitted by the ultrasonic probe is selected according to different scenarios, and this embodiment 1 does not limit this.

[0024] Step 3: Use the ultrasonic probe to transmit an ultrasonic signal to the area to be inspected, and collect the ultrasonic signal at the ultrasonic signal receiving point to obtain a received ultrasonic signal.

[0025] Specifically, the process of transmitting and receiving ultrasonic signals is as follows: Step 31: When a first preset load is applied to the post insulator 1 to be tested, the ultrasonic probe is used to transmit an ultrasonic signal to the area to be tested, and the ultrasonic signal at the ultrasonic signal receiving point is collected to obtain a first received ultrasonic signal.

[0026] Step 32: When a second preset load is applied to the post insulator 1 to be tested, the ultrasonic probe is used to transmit an ultrasonic signal to the area to be tested, and the ultrasonic signal at the ultrasonic signal receiving point is collected to obtain a second received ultrasonic signal.

[0027] It should be noted that the first preset load state and the second preset load state are achieved by loading step by step according to the load conditions of the tested support insulator 1 under normal use; ultrasonic signal data is collected after each load is stabilized to ensure the accuracy of the data collection results.

[0028] Step 4: Preprocess the received ultrasonic signal to obtain a preprocessed ultrasonic signal. The signal preprocessing process includes noise reduction and impurity removal. The noise reduction and impurity removal processes in this embodiment 1 are both performed using existing ultrasonic signal noise reduction and impurity removal methods, which are not limited here.

[0029] Specifically, the first received ultrasonic signal and the second received ultrasonic signal are subjected to noise reduction and impurity removal processing to obtain a preprocessed first received ultrasonic signal and a preprocessed second received ultrasonic signal; wherein the preprocessed first received ultrasonic signal is used in the process of calculating the first echo wave velocity in step 5, and the preprocessed second received ultrasonic signal is used in the process of calculating the second echo wave velocity in step 5.

[0030] Step 5: Perform real-time beam analysis on the received ultrasonic signal to obtain the beam analysis result. Specifically, the process of real-time beam analysis is as follows: Step 51 : Calculate the echo velocity of the ultrasound on the post insulator 1 to be tested under a first preset load state according to the preprocessed first received ultrasonic signal to obtain a first echo velocity.

[0031] Step 52: Calculate the echo velocity of the ultrasound on the post insulator 1 to be tested under a second preset load state according to the preprocessed second received ultrasonic signal to obtain a second echo velocity.

[0032] Step 53: Calculate the acoustic elastic constant of the post insulator 1 to be measured according to the first echo wave velocity and the second echo wave velocity; wherein the calculation process of the acoustic elastic constant of the post insulator 1 to be measured is as follows:

[0033] in, is the acoustoelastic constant of the post insulator 1 to be tested; is the first echo velocity; is the second echo velocity.

[0034] Step 6: According to the real-time beam analysis result, the porcelain type detection result of the post insulator 1 to be tested is obtained.

[0035] Specifically, the process includes: comparing the acoustic elastic constant of the post insulator 1 to be tested with the acoustic elastic constant threshold to obtain a real-time beam analysis result; wherein, the setting of the acoustic elastic constant threshold is determined according to the type of the post insulator 1 to be tested and the detection requirements; preferably, the acoustic elastic constant threshold is selected according to the industry standard value of the post insulator 1 to be tested.

[0036] If the acoustic elastic constant of the post insulator 1 to be tested is greater than the acoustic elastic constant threshold, the porcelain type detection result of the post insulator 1 to be tested is high-strength porcelain; otherwise, the porcelain type detection result of the post insulator 1 to be tested is ordinary porcelain.

[0037] The porcelain detection method for post insulators described in this embodiment 1 transmits an ultrasonic signal to the area to be inspected, receives the ultrasonic signal from the ultrasonic signal receiving point, and performs real-time wave velocity analysis on the ultrasonic signal received by the ultrasonic signal receiving point, and judges the porcelain type of the post insulator in real time according to the real-time beam analysis result; wherein, by measuring the acoustic elastic constant of the post insulator to be tested and comparing it with the set threshold value, it is judged whether its porcelain type is high-strength porcelain or ordinary porcelain, thereby avoiding the application of ordinary porcelain post insulators in the scenario of high-strength porcelain insulators, ensuring the service life of the insulator, avoiding power accidents or failures caused by porcelain problems, and ensuring the safe operation of the power grid.

[0038] Example 2 This embodiment 2 provides a porcelain detection device for a post insulator, including an ultrasonic probe, an ultrasonic signal acquisition module, a data analysis module and a load application device.

[0039] The ultrasonic probe is installed at preset positions around the post insulator 1 to be tested, and is used to transmit ultrasonic signals to the area to be tested of the post insulator 1 to be tested; wherein, an ultrasonic signal receiving point is predetermined in the area to be tested of the post insulator 1 to be tested; the ultrasonic signal acquisition module is used to collect the ultrasonic signal of the ultrasonic signal receiving point to obtain a received ultrasonic signal; the load application device is used to apply a preset load to the post insulator 1 to be tested; the data analysis module is used to perform real-time beam analysis on the received ultrasonic signal, and obtain a porcelain type detection result of the post insulator 1 to be tested according to the real-time beam analysis result.

[0040] In this embodiment 2, the number of ultrasonic signal receiving points predetermined in the area to be tested is three; the first ultrasonic signal receiving point is located at the center of the upper end surface of the post insulator 1 to be tested; the second ultrasonic signal receiving point is located at the upper end surface of the post insulator 1 to be tested, and is set offset from the center of the upper end surface of the post insulator 1 to be tested; the third ultrasonic signal receiving point is located on the outer wall surface of the post insulator 1 to be tested.

[0041] As attached Figure 2 As shown, the ultrasonic probe includes a straight probe 2, a transverse probe 3 and an oblique probe 4; the straight probe 2 is vertically arranged above the upper end surface of the post insulator 1 to be measured, and the ultrasonic signal emitted by the straight probe 2 passes through the center of the upper end surface of the post insulator 1 to be measured; the transverse probe 3 is horizontally arranged on the side of the post insulator 1 to be measured; the oblique probe 4 is obliquely arranged above the upper end surface of the post insulator 1 to be measured, and the axial direction of the oblique probe 4 forms an angle of 45° with the upper end surface of the post insulator 1 to be measured.

[0042] It should be noted that, by setting the straight probe 2, the transverse probe 3 and the oblique probe 4, the ultrasonic signals emitted by the three probes can be secondary refracted and reflected at multiple angles in the post insulator 1 to be tested, thereby ensuring the accuracy of the data; the reason is that: when the room temperature vulcanized silicone rubber (Room Temperature Silicone Rubber) coating of the post insulator is above 0.3mm, the ultrasonic signal will produce a certain attenuation and refraction and reflection when passing through the RTV coating. Ultrasonic waves are emitted through multiple probes, thereby avoiding the influence of the RTV coating on the surface of the post insulator and causing misjudgment.

[0043] In this embodiment 2, the working process of the ultrasonic signal acquisition module and the load applying device is as follows: The load applying device is used to apply a first preset load to the post insulator 1 to be tested. When the first preset load is applied to the post insulator 1 to be tested, the ultrasonic probe is used to transmit an ultrasonic signal to the area to be tested, and the ultrasonic signal at the ultrasonic signal receiving point is collected to obtain a first received ultrasonic signal.

[0044] The load applying device is used to apply a second preset load to the post insulator 1 to be tested. When the second preset load is applied to the post insulator 1 to be tested, the ultrasonic probe is used to transmit an ultrasonic signal to the area to be tested, and the ultrasonic signal at the ultrasonic signal receiving point is collected to obtain a second received ultrasonic signal.

[0045] In this embodiment 2, the data analysis module includes a signal preprocessing module, a beam calculation module and a comparison output module.

[0046] The signal preprocessing module is used to perform noise reduction and impurity removal processing on the first received ultrasonic signal and the second received ultrasonic signal to obtain a preprocessed first received ultrasonic signal and a preprocessed second received ultrasonic signal.

[0047] The beam calculation module is used to calculate the echo velocity of the ultrasound on the post insulator 1 to be measured under a first preset load state according to the first received ultrasonic signal, and obtain the first echo velocity; calculate the echo velocity of the ultrasound on the post insulator 1 to be measured under a second preset load state according to the second received ultrasonic signal, and obtain the second echo velocity; and calculate the acoustic elastic constant of the post insulator 1 to be measured according to the first echo velocity and the second echo velocity.

[0048] The comparison output module is used to compare the acoustic elastic constant of the post insulator 1 to be tested with the acoustic elastic constant threshold to obtain a real-time beam analysis result; wherein, if the acoustic elastic constant of the post insulator 1 to be tested is greater than the acoustic elastic constant threshold, the porcelain type detection result of the post insulator 1 to be tested is high-strength porcelain; otherwise, the porcelain type detection result of the post insulator 1 to be tested is ordinary porcelain.

[0049] It should be noted that the working process and principle of the porcelain detection device for post insulators described in this embodiment 2 are detailed in the process of the porcelain detection method in the above embodiment 1, and will not be repeated here.

[0050] The porcelain detection method for post insulators described in the present invention selects several points in the area to be inspected as ultrasonic signal receiving points, uses an ultrasonic probe to transmit ultrasonic signals to the area to be inspected, and then receives the ultrasonic signals from the receiving points, performs real-time wave velocity analysis on the ultrasonic signals received by the receiving points, and obtains the porcelain type of the post insulator based on the analysis results, thereby making it possible to judge the porcelain type of the post insulator in real time and ensure that the porcelain of the post insulator meets the requirements.

[0051] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A porcelain detection method for a post insulator, characterized in that: include: Determining a porcelain detection area of ​​a post insulator (1) to be tested to obtain the area to be tested; selecting a number of points in the area to be tested as ultrasonic signal receiving points; Installing ultrasonic probes at preset positions around the post insulator (1) to be tested; Using the ultrasonic probe to transmit an ultrasonic signal to the area to be inspected, and collecting the ultrasonic signal at the ultrasonic signal receiving point to obtain a received ultrasonic signal; The received ultrasonic signal is subjected to real-time beam analysis, and a porcelain type detection result of the post insulator (1) to be tested is obtained according to the real-time beam analysis result.

2. A porcelain detection method for post insulators according to claim 1, characterized in that: The surface of the post insulator (1) to be tested is coated with a coupling agent.

3. A porcelain detection method for post insulators according to claim 1, characterized in that: Using the ultrasonic probe to transmit an ultrasonic signal to the area to be inspected, and collecting the ultrasonic signal at the ultrasonic signal receiving point to obtain the receiving point ultrasonic signal; When a first preset load is applied to the post insulator (1) to be tested, an ultrasonic signal is emitted to the area to be tested using the ultrasonic probe, and the ultrasonic signal at the ultrasonic signal receiving point is collected to obtain a first received ultrasonic signal; When a second preset load is applied to the post insulator (1) to be tested, the ultrasonic probe is used to transmit an ultrasonic signal to the area to be tested, and the ultrasonic signal at the ultrasonic signal receiving point is collected to obtain a second received ultrasonic signal.

4. A porcelain detection method for post insulators according to claim 3, characterized in that: The process of performing real-time beam analysis on the received ultrasonic signal is specifically as follows: According to the first received ultrasonic signal, calculating the echo velocity of the ultrasonic wave on the post insulator (1) to be tested under a first preset load state to obtain a first echo velocity; According to the second received ultrasonic signal, calculating the echo velocity of the ultrasound on the post insulator (1) to be tested under a second preset load state to obtain a second echo velocity; Calculating the acoustic elastic constant of the post insulator (1) to be tested according to the first echo wave velocity and the second echo wave velocity; The acoustic elastic constant of the post insulator (1) to be tested is compared with an acoustic elastic constant threshold to obtain a real-time beam analysis result.

5. A porcelain detection method for post insulators according to claim 4, characterized in that: The process of obtaining the porcelain type detection result of the post insulator (1) to be tested according to the real-time beam analysis result is as follows: If the acoustic elastic constant of the post insulator (1) to be tested is greater than the acoustic elastic constant threshold, the porcelain type detection result of the post insulator (1) to be tested is high-strength porcelain; otherwise, the porcelain type detection result of the post insulator (1) to be tested is ordinary porcelain.

6. A porcelain detection method for post insulators according to claim 4, characterized in that: Before performing real-time beam analysis on the received ultrasonic signal, a signal preprocessing step is also included; The signal preprocessing step is specifically as follows: The first received ultrasonic signal and the second received ultrasonic signal are subjected to noise reduction and impurity removal processing to obtain a preprocessed first received ultrasonic signal and a preprocessed second received ultrasonic signal; wherein the preprocessed first received ultrasonic signal is used to calculate a first echo wave velocity, and the preprocessed second received ultrasonic signal is used to calculate a second echo wave velocity.

7. A porcelain detection device for post insulators, characterized in that: It includes an ultrasonic probe, an ultrasonic signal acquisition module and a data analysis module; The ultrasonic probe is installed at preset positions around the post insulator (1) to be tested; wherein the ultrasonic probe is used to transmit an ultrasonic signal to the area to be tested of the post insulator (1) to be tested, and an ultrasonic signal receiving point is predetermined in the area to be tested of the post insulator (1) to be tested; The ultrasonic signal acquisition module is used to acquire the ultrasonic signal of the ultrasonic signal receiving point to obtain a received ultrasonic signal; The data analysis module is used to perform real-time beam analysis on the received ultrasonic signal, and obtain a porcelain type detection result of the post insulator (1) to be tested based on the real-time beam analysis result.

8. A porcelain detection device for post insulators according to claim 7, characterized in that: The ultrasonic probe comprises a straight probe (2), a transverse probe (3) and an oblique probe (4); the straight probe (2) is vertically arranged above the upper end surface of the post insulator (1) to be measured, and the ultrasonic signal emitted by the straight probe (2) passes through the center of the upper end surface of the post insulator (1) to be measured; the transverse probe (3) is horizontally arranged on the side of the post insulator (1) to be measured; the oblique probe (4) is obliquely arranged above the upper end surface of the post insulator (1) to be measured, and the axial direction of the oblique probe (4) forms an angle of 45° with the upper end surface of the post insulator (1) to be measured.

9. A porcelain detection device for post insulators according to claim 7, characterized in that: The number of ultrasonic signal receiving points is three; wherein the first ultrasonic signal receiving point is located at the center of the upper end surface of the post insulator (1) to be tested; the second ultrasonic signal receiving point is located at the upper end surface of the post insulator (1) to be tested and is arranged offset from the center of the upper end surface of the post insulator (1) to be tested; and the third ultrasonic signal receiving point is located on the outer wall surface of the post insulator (1) to be tested.

10. A porcelain detection device for post insulators according to claim 7, characterized in that: It also comprises a load applying device, wherein the load applying device is used to apply a preset load to the post insulator (1) to be tested.

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