High-voltage circuit breaker spring state detection method and state evaluation system

Abstract

The invention relates to a high-voltage circuit breaker spring state detection method and a state evaluation system. The method comprises the following steps: testing a subject; obtaining a sound sample of the subject in the test process and analyzing the sound sample, wherein the analysis result comprises normal and abnormal; determining the sound source position of the abnormal sound in the abnormal sound sample; repeating the test process and performing secondary sound collection on the sound source position to obtain a secondary sound sample; comparing the similarity and amplitude difference between the abnormal sound sample and the secondary sound sample; and repeating the test process again according to the amplitude difference value, correcting the position of the sound source, and marking the corrected position of the sound source. According to the high-voltage circuit breaker spring state detection method and the state evaluation system disclosed by the invention, the sound sample is obtained by driving the high-voltage circuit breaker spring to enter the simulated working state, and the sending position of the sound sample is traced by using a multi-position comparison mode, so that the automatic detection of the high-voltage circuit breaker spring is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of defect detection, and in particular to a high-voltage circuit breaker spring state detection method and a state evaluation system. Background Art

[0002] Circuit breakers are widely used in power systems. In the spring operating mechanism of the circuit breaker, the quality of the high-voltage circuit breaker spring is directly related to the normal operation of the spring operating mechanism. Therefore, the high-voltage circuit breaker spring plays a very important role in the operating performance of the entire circuit breaker and even the entire power grid.

[0003] At present, high-voltage circuit breaker springs may be damaged for two reasons. On the one hand, there are dents on the surface of the high-voltage circuit breaker springs when they leave the factory. Accidental damage such as bumps and scratches during transportation and installation have a serious impact on the performance and life of the springs. On the other hand, during long-term operation, high-voltage circuit breaker springs may experience fatigue crack expansion, creep crack expansion, and even spring wire breakage, which may lead to mechanical failure of the circuit breaker's spring operating mechanism during operation, posing a certain potential threat to the safe operation of the power grid.

[0004] There are two ways to optimize the high-voltage circuit breaker spring: performance optimization and detection method optimization. Performance optimization includes material optimization, structure optimization and simulation. Detection method optimization is to detect the relevant parameters of the high-voltage circuit breaker spring with the help of more advanced detection methods.

[0005] With the support of new technologies, the method of detecting high-voltage circuit breaker springs by sound has begun to be used. The advantage of this method is that it can judge whether the high-voltage circuit breaker spring has defects by the sound produced by the high-voltage circuit breaker spring when it is working or simulating work, and the results obtained are more representative. However, how to determine the defect location of the high-voltage circuit breaker spring by sound requires further research. Summary of the invention

[0006] The present invention provides a high-voltage circuit breaker spring state detection method and state evaluation system, which obtains a sound sample by driving the high-voltage circuit breaker spring into a simulated working state, and simultaneously uses a multi-position comparison method to trace the emission position of the sound sample, thereby realizing automatic detection of the high-voltage circuit breaker spring.

[0007] The above object of the present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a method for detecting a spring state of a high-voltage circuit breaker, comprising: The subjects were fixed at both ends and the test included multiple squeezing movements and multiple recovery movements; Acquire the voice samples of the subjects during the test and analyze the voice samples, and the analysis results include normal and abnormal; Determine the sound source position of the abnormal sound in the abnormal sound sample; Repeat the test process and collect the sound at the sound source location a second time to obtain a second sound sample; Compare the similarity and amplitude difference between the abnormal sound sample and the secondary sound sample; Repeat the test process again and correct the sound source position according to the amplitude difference; and Mark at the corrected sound source location; There is at least one restoring action between any two squeezing actions, and there is at least one squeezing action between any two restoring actions.

[0008] In a possible implementation manner of the first aspect, determining a sound source position of an abnormal sound in an abnormal sound sample includes: Analyzing the sound samples with abnormal analysis results to obtain a first abnormal sound sample curve group; Acquiring sound samples at multiple positions of the subject and parsing the acquired sound samples into a second abnormal sound sample curve group; Determine the sound source position of the abnormal sound according to the attenuation direction of the plurality of second abnormal sound sample curve groups; Wherein, in the direction close to the abnormal sound source position, the attenuation direction of the second abnormal sound sample curve group tends to decrease.

[0009] In a possible implementation manner of the first aspect, the test corresponding to obtaining the first abnormal sound sample curve group includes the same squeezing action and the same restoring action.

[0010] In a possible implementation of the first aspect, the sound samples in the test process are obtained by air conduction and by conduction along a subject.

[0011] In a second aspect, the present invention provides a high-voltage circuit breaker spring state assessment system, comprising: Testing room; A piston, slidably connected to the detection chamber; A driver, located outside the detection chamber and connected to the piston; The lifting module is located in the testing room; The annular moving module is arranged on the lifting module, and the moving direction of the annular moving module is parallel to the moving direction of the piston; A test arm is provided on the annular mobile module; A posture holding sensor is provided on the test arm, and the posture holding sensor is configured so that the test arm and the detection position of the posture holding sensor remain relatively still during the test; Two groups of FP sensors are arranged on the test arm. The first group of FP sensors is used to abut against the surface of the test object, and the second group of FP sensors is near the abutting position of the first group of FP sensors and the test object but does not contact the test object.

[0012] In a possible implementation manner of the second aspect, a sound absorbing layer is provided on an inner wall of the detection chamber.

[0013] In a possible implementation manner of the second aspect, the posture holding sensor includes a distance measuring sensor and a pressure sensor.

[0014] In a possible implementation of the second aspect, an elastic base is provided on the test arm, and an open test cavity is provided on the elastic base; The first set of FP sensors is located in the open test chamber.

[0015] In a possible implementation manner of the second aspect, the second group of FP sensors are evenly arranged around the first group of FP sensors.

[0016] In a possible implementation manner of the second aspect, an axis of the second group of FP sensors is not parallel to an axis of the first group of FP sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention provides a schematic block diagram of the steps of a method for detecting a spring state of a high-voltage circuit breaker.

[0018] Figure 2 It is a schematic diagram of a subject provided by the present invention being squeezed.

[0019] Figure 3 It is a schematic diagram of a subject provided by the present invention when being restored.

[0020] Figure 4 It is a schematic diagram of the temporal distribution of a squeezing action and a restoring action provided by the present invention.

[0021] Figure 5 It is a schematic diagram of a process for correcting the sound source position provided by the present invention.

[0022] Figure 6 It is a structural schematic diagram of a high-voltage circuit breaker spring state evaluation system provided by the present invention.

[0023] Figure 7 yes Figure 6 Enlarged schematic diagram of part A.

[0024] Figure 8 It is a schematic diagram of an FP sensor provided by the present invention being located inside an elastic base.

[0025] In the figure, 11, detection chamber, 12, piston, 13, driver, 21, lifting module, 22, annular moving module, 31, test arm, 32, posture holding sensor, 33, FP sensor, 34, elastic base, 35, open test chamber, 111, sound absorbing layer. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0027] The present invention discloses a method for detecting the state of a high voltage circuit breaker spring. Figure 1 In some examples, the high-voltage circuit breaker spring state detection method disclosed in the present invention includes the following steps: S101, testing the subjects whose two ends are fixed, the test includes multiple squeezing actions and multiple recovery actions; S102, obtaining a voice sample of the subject during the test and analyzing the voice sample, wherein the analysis result includes normal and abnormal; S103, determining the sound source position of the abnormal sound in the abnormal sound sample; S104, repeating the test process and collecting the sound from the sound source position for a second time to obtain a second sound sample; S105, comparing the similarity and amplitude difference between the abnormal sound sample and the secondary sound sample; S106, repeating the test process again according to the amplitude difference and correcting the sound source position; and S107, marking at the corrected sound source position; There is at least one restoring action between any two squeezing actions, and there is at least one squeezing action between any two restoring actions.

[0028] The high-voltage circuit breaker spring state detection method disclosed in the present invention is applied to a high-voltage circuit breaker spring state evaluation system, and the evaluation system is introduced in the subsequent content.

[0029] In step S101, the test object (high-voltage circuit breaker spring) with both ends fixed is tested. The test includes multiple squeezing actions and multiple restoring actions. The squeezing action ( Figure 2 shown) and recovery actions ( Figure 2 There are two types of test actions: one is the prescribed test actions, and the other is the actions performed by the subjects in the actual work process.

[0030] For the squeeze action and the recovery action, there are the following requirements: there is at least one recovery action between any two squeeze actions, and there is at least one squeeze action between any two recovery actions, such as Figure 4 shown.

[0031] The requirements enable the subjects to achieve segmented extrusion and segmented recovery. Segmented extrusion means that a complete extrusion process is achieved through multiple extrusion actions, and segmented recovery means that a complete recovery process is achieved through multiple recovery actions.

[0032] In step S102, the sound samples of the subjects during the test are obtained and analyzed. The analysis results include normal and abnormal. The analysis of the sound samples here refers to converting the sound into the frequency domain and then parsing the sound into multiple regular waveforms (sine waves).

[0033] By testing subjects who meet the requirements and establishing a sound sample library, the analysis results can be obtained as normal standard sound samples. At this time, the sound samples generated by the subjects during the test can be compared with the standard sound samples to obtain the analysis results.

[0034] In step S103, the sound source position of the abnormal sound in the abnormal sound sample is determined, and then in step S104, the test process is repeated and a secondary sound collection is performed on the sound source position to obtain a secondary sound sample. The secondary sound sample obtained here is used to correct the sound source position.

[0035] The specific correction process is to first compare the similarity and amplitude difference between the abnormal sound sample and the secondary sound sample in step S105, and then repeat the test process again in step S106 according to the amplitude difference and correct the sound source position, such as Figure 5 As shown, the waveform in the figure represents the amplitude change of the waveform in a secondary sound sample in the direction close to the sound source position, and the amplitude difference gradually decreases in the direction close to the sound source position.

[0036] It should be understood that the sound propagation process will face the problem of energy loss, that is, the intensity of the sound will gradually decrease. Therefore, the amplitude difference can be used to determine whether the sound source position needs to be moved. The process of moving the sound source position at this time is called correcting the sound source position.

[0037] Finally, in S107, the corrected sound source position is marked. There are several marking methods: 1. Use inkjet to mark the corrected sound source position; 2. Give the coordinates of the marked position.

[0038] In some examples, determining the sound source location of the abnormal sound in the abnormal sound sample includes the following steps: S201, analyzing the sound samples with abnormal analysis results to obtain a first abnormal sound sample curve group; S202, collecting sound samples at multiple positions of the subject and parsing the obtained sound samples into a second abnormal sound sample curve group; S203, determining the sound source position of the abnormal sound according to the attenuation direction of the plurality of second abnormal sound sample curve groups; Wherein, in the direction close to the abnormal sound source position, the attenuation direction of the second abnormal sound sample curve group tends to decrease.

[0039] Specifically, in step S201, the sound samples with abnormal analysis results are analyzed to obtain a first abnormal sound sample curve group. Then, step S202 is executed, in which sound samples are collected at multiple positions of the subject and a second abnormal sound sample curve group is analyzed from the obtained sound samples.

[0040] The first abnormal sound sample curve group and the second abnormal sound sample curve group are both generated based on the same defect, that is, the corresponding curves in the first abnormal sound sample curve group and the second abnormal sound sample curve group should have the characteristics of the same frequency but different amplitudes.

[0041] By using a plurality of second abnormal sound sample curve groups, the attenuation direction can be determined. At this time, by adjusting the sound source position according to the attenuation direction, an accurate or relatively accurate sound source position can be obtained.

[0042] In some possible implementations, the test corresponding to the first abnormal sound sample curve group includes the same squeezing action and the same restoring action, so as to ensure that the first abnormal sound sample curve group and the second abnormal sound sample curve group have a high degree of similarity.

[0043] In some possible implementations, the sound samples during the test are obtained by conduction along the air and along the subject, with the aim of improving the accuracy of the detection process.

[0044] It should be understood that the characteristics of the sound propagation process need to be taken into account here. The sound generated by the test subject during the test will propagate both in the air and along the test subject. Therefore, in the present invention, the sound conducted through the air and the sound conducted through the test subject are obtained at the same time, and then compared and verified, and the sound (waveform) obtained only through air conduction or the sound (waveform) conducted only through the test subject is discarded.

[0045] The present invention also discloses a high-voltage circuit breaker spring state evaluation system, including a detection chamber 11, a piston 12, a driver 13, a lifting module 21, a ring-shaped moving module 22, a test arm 31, a posture holding sensor 32 and an FP sensor 33. The detection chamber 11 is used to provide a closed test environment, the piston 12 is slidably connected to the detection chamber 11, and the driver 13 is located outside the detection chamber 11 and connected to the piston 12. Figure 6 shown.

[0046] In some possible implementations, the detection chamber 11 is provided with a placement port and a sealing plate, and after the sealing plate is opened, the subject can be placed in the detection chamber 11 through the placement port. Countersunk holes are provided on the bottom surface of the detection chamber 11 and the piston 12 to fix the two ends of the subject.

[0047] The function of the driver 13 is to drive the piston 12 to perform linear reciprocating motion along the axis direction of the detection chamber 11. In some possible implementations, the driver 13 uses an electric cylinder. At the same time, for the detection chamber 11 and the piston 12, the space size inside the detection chamber 11 is larger than the size of the connection between the detection chamber 11 and the piston 12, and the piston 12 needs to have a sufficient length so that the piston 12 always maintains a sliding connection with the detection chamber 11 when moving.

[0048] This is because a sound absorbing layer 111 needs to be added to the inner wall of the detection chamber 11. The function of the sound absorbing layer 111 is to absorb the sound generated by the test object (spring) during the test to avoid inaccurate results caused by multiple reflections of the sound.

[0049] The lifting module 21, the annular movable module 22, the test arm 31, the posture holding sensor 32 and the FP sensor 33 are all located inside the detection chamber 11. The lifting module 21 is fixedly mounted on the inner wall of the detection chamber 11, and the annular movable module 22 is mounted on the lifting module 21. The moving direction of the lifting module 21 is parallel to the moving direction of the piston 12 or the axial direction of the detection chamber 11.

[0050] The moving direction of the annular moving module 22 is also parallel to the moving direction of the piston 12 or the axial direction of the detection chamber 11 .

[0051] The test arm 31 is installed on the annular movable module 22, and the test arm 31 moves around the axis of the detection chamber 11 driven by the annular movable module 22. It can also be described here that the annular movable module 22 moves in the axial direction of the detection chamber 11 driven by the lifting module 21, and the test arm 31 moves in the circumferential direction of the detection chamber 11 driven by the annular movable module 22.

[0052] The posture holding sensor 32 is installed on the test arm 31, and its function is to keep the test arm 31 and the detection position of the posture holding sensor 32 relatively still during the test, or to describe that the test arm 31 can move along with the movement of the subject.

[0053] The posture holding sensor 32 may use a distance measuring sensor or a pressure sensor, and the distance measuring sensor or the pressure sensor needs to be set at an angle to avoid the value not changing, the value suddenly dropping to zero, and being squeezed and damaged.

[0054] There are two groups of FP sensors 33. The first group of FP sensors 32 is used to abut against the surface of the test subject, and the second group of FP sensors 32 is near the abutment position of the first group of FP sensors 32 and the test subject but does not contact the test subject.

[0055] The first group of FP sensors 32 is used to collect the sound propagating along the subject, and the second group of FP sensors 32 is used to collect the sound propagating in the air around the subject.

[0056] The test arm 31 provides a telescopic function so that the first set of FP sensors 32 can abut against the surface of the test object.

[0057] For some examples, see Figure 7 and Figure 8 , an elastic base 34 is provided on the test arm 31, an open test cavity 35 is provided on the elastic base 34, and the first group of FP sensors 32 is located in the open test cavity 35. The elastic base 34 has two functions. The first function is to protect the first group of FP sensors 32 and prevent the first group of FP sensors 32 from being damaged due to excessive local pressure in the process of moving with the subject; the second function is to provide a relatively closed working environment for the first group of FP sensors 32, because the elastic base 34 can be in continuous contact with the subject through dynamic deformation (local deformation) in the process of moving with the subject.

[0058] In some examples, the second group of FP sensors 32 are evenly arranged around the first group of FP sensors 32, for example, they can be mounted on a conical ring. Because the position of the sound propagating along the air cannot be determined during the sound collection process, the second group of FP sensors 32 are required to work together so that at least one FP sensor 32 in the second group can collect the sound propagating along the air.

[0059] Further, the axes of the second set of FP sensors 32 are not parallel to the axes of the first set of FP sensors 32 .

[0060] It should be understood that the driver 13, lifting module 21, annular movable module 22, test arm 31, posture holding sensor 32 and FP sensor 33 mentioned above all need to be controlled. In the present invention, a master controller is used for control. The master controller includes a controller (such as a PLC) and supporting circuits. The supporting circuits are used to realize power supply, motion control (driver 13, lifting module 21, annular movable module 22, test arm 31) and communication (posture holding sensor 32 and FP sensor 33).

[0061] For initial startup, the position of the test arm 31 is adjusted manually (via a camera in the detection room 11 ) or the position adjustment of the test arm 31 is automated with the help of a neural recognition network.

[0062] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting a high voltage circuit breaker spring state, characterized in that: include: The subjects were fixed at both ends and the test included multiple squeezing movements and multiple recovery movements; Acquire the voice samples of the subjects during the test and analyze the voice samples, and the analysis results include normal and abnormal; Determine the sound source position of the abnormal sound in the abnormal sound sample; Repeat the test process and collect the sound at the sound source location a second time to obtain a second sound sample; Compare the similarity and amplitude difference between the abnormal sound sample and the secondary sound sample; Repeat the test process again and correct the sound source position according to the amplitude difference; as well as Mark at the corrected sound source location; There is at least one restoring action between any two squeezing actions, and there is at least one squeezing action between any two restoring actions.

2. The high-voltage circuit breaker spring state detection method according to claim 1, characterized in that: Determining the sound source position of the abnormal sound in the abnormal sound sample includes: Analyzing the sound samples with abnormal analysis results to obtain a first abnormal sound sample curve group; Acquiring sound samples at multiple positions of the subject and parsing the acquired sound samples into a second abnormal sound sample curve group; Determine the sound source position of the abnormal sound according to the attenuation direction of the plurality of second abnormal sound sample curve groups; Wherein, in the direction close to the abnormal sound source position, the attenuation direction of the second abnormal sound sample curve group tends to decrease.

3. The high-voltage circuit breaker spring state detection method according to claim 2, characterized in that: The test corresponding to the first abnormal sound sample curve group includes the same squeezing action and the same restoring action.

4. The high-voltage circuit breaker spring state detection method according to any one of claims 1 to 3, characterized in that: The sound samples during the test are obtained by conduction along the air and conduction along the subject.

5. A high voltage circuit breaker spring state assessment system, characterized in that: include: Testing room (11); A piston (12) is slidably connected to the detection chamber (11); A driver (13) is located outside the detection chamber (11) and connected to the piston (12); A lifting module (21) is arranged in the detection room (11); An annular movable module (22) is arranged on the lifting module (21), and the moving direction of the annular movable module (22) is parallel to the moving direction of the piston (12); A test arm (31) is arranged on the annular movable module (22); A posture holding sensor (32) is provided on the test arm (31), and the posture holding sensor (32) is configured so that the test arm (31) and a detection position of the posture holding sensor (32) remain relatively still during the test; Two groups of FP sensors (33) are both arranged on the test arm (31), the first group of FP sensors (32) being used to abut against the surface of the subject, and the second group of FP sensors (32) being located near the abutment position of the first group of FP sensors (32) and the subject and not in contact with the subject.

6. The high-voltage circuit breaker spring state evaluation system according to claim 5, characterized in that: A sound absorbing layer (111) is provided on the inner wall of the detection chamber (11).

7. The high-voltage circuit breaker spring state evaluation system according to claim 5, characterized in that: The attitude holding sensor (32) includes a distance measuring sensor and a pressure sensor.

8. The high-voltage circuit breaker spring state evaluation system according to any one of claims 5 to 7, characterized in that: An elastic base (34) is provided on the test arm (31), and an open test cavity (35) is provided on the elastic base (34); A first set of FP sensors (32) is located within an open test cavity (35).

9. The high-voltage circuit breaker spring state evaluation system according to claim 5, characterized in that: The second group of FP sensors (32) are evenly arranged around the first group of FP sensors (32).

10. The high-voltage circuit breaker spring state evaluation system according to claim 9, characterized in that: The axes of the second set of FP sensors (32) are not parallel to the axes of the first set of FP sensors (32).

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