CN111504627A - A method for detecting defective parts of circuit breakers - Google Patents

Abstract

An embodiment of the present disclosure discloses a method for detecting defective parts of a circuit breaker. The method includes: S1: Connect a mechanical characteristic instrument to the circuit breaker to collect mechanical characteristic instrument data of the circuit breaker, and connect a vibration tester to the circuit breaker to collect the circuit breaker data The vibration tester data; S2: determine whether the circuit breaker operates normally according to the vibration tester data, and when abnormal operation occurs, obtain the to-be-verified cause of the abnormal operation according to the mechanical characteristic instrument data and the abnormal vibration tester data conditions; S3: establish a simulation model of the circuit breaker, set simulation model parameters according to the conditions to be verified, and obtain a simulation result; S4: determine a target abnormal component when the simulation result can simulate a change trend of abnormal operation. The technical solution avoids potential safety hazards in the use of the circuit breaker, ensures the safe use of the circuit breaker, and saves after-sale costs.

Description

A method for detecting defective parts of circuit breakers

technical field

The present disclosure relates to the technical field of data analysis, in particular to a method for detecting defective parts of a circuit breaker.

Background technique

The circuit breaker is a very critical equipment in the transmission and distribution system, and its operation status directly affects the operation stability and power supply reliability of the power system. Mechanical faults are the main faults of high-voltage circuit breakers, so it is particularly important to detect the mechanical characteristics of circuit breakers.

In the prior art, most of the detection methods for mechanical characteristics are mechanical characteristic instruments. Since the characteristic detection results of each circuit breaker cannot be completely unified, the national standard or the standard range of each company has a wide margin. When there are defective parts inside the circuit breaker, since the early stage of the defective parts has little effect on the speed and displacement of the circuit breaker, the mechanical characteristic instrument cannot be used to diagnose at this time, so the conclusion that conforms to the national standard or the standard of each company can be obtained. However, with the accumulation of the circuit breaker operation times, the missing component will have serious deformation, interference and other problems, which will have a greater impact on the speed and displacement of the circuit breaker. At this time, the mechanical characteristic instrument can be used to detect the fault. For example, the national standard requires that the mechanical life of M2-class circuit breakers exceeds 10,000 times, and the number of partial closing times of circuit breakers in the factory generally does not exceed 500 times. If a circuit breaker with defective parts is assembled into a substation, as the circuit breaker operates a certain number of times, it will easily fail and seriously affect safety, which also increases the company's after-sales service costs. Therefore, there is an urgent need for a technical solution for detecting defective parts when the cumulative number of operations of the circuit breaker is small.

SUMMARY OF THE INVENTION

In order to solve the problems in the related art, an embodiment of the present disclosure provides a method for detecting defective parts of a circuit breaker.

An embodiment of the present disclosure provides a method for detecting a defective part of a circuit breaker.

Specifically, the detection method includes the following steps:

S1: Connect the mechanical characteristic instrument to the circuit breaker to collect the mechanical characteristic instrument data of the circuit breaker, and connect the vibration tester to the circuit breaker to collect the vibration test instrument data of the circuit breaker, wherein the mechanical characteristic instrument data and the vibration test instrument data are provided with the same time reference point;

S2: Determine whether the circuit breaker operates normally according to the vibration tester data, and when abnormal operation occurs, obtain the conditions to be verified that cause the abnormal operation according to the mechanical characteristic instrument data and the abnormal vibration tester data;

S3: establish a simulation model of the circuit breaker, set simulation model parameters according to the conditions to be verified, and obtain a simulation result;

S4: when the simulation result can simulate the change trend of abnormal operation, determine the target abnormal component; otherwise, exclude the current condition to be verified, repeat steps S3-S4, and obtain the simulation result of the next condition to be verified, until the target abnormality is determined part.

In the first implementation manner of the present disclosure, in step S1, the time reference point of the mechanical characteristic instrument data and the vibration tester data is set to be the same, and any one of the following methods is adopted:

Simultaneously trigger the mechanical characteristic tester and the vibration tester;

Connect the breaker break wire to the vibration tester.

In the second implementation manner of the present disclosure, when collecting vibration tester data in step S1, the sensor of the vibration tester is arranged on one or both of the following components of the circuit breaker: oil buffer joint or closing latch.

In a third implementation manner of the present disclosure, the vibration tester data at least includes: the time point, peak value and duration of each vibration wave; the mechanical characteristic instrument data at least includes: the position of the circuit breaker corresponding to each vibration wave.

In a fourth implementation manner of the present disclosure, in step S2, it is determined whether the circuit breaker is operating normally according to the vibration tester data, and when abnormal operation occurs, the result is obtained according to the mechanical characteristic instrument data and the abnormal vibration tester data. The condition to be verified for the exception to run is implemented as:

The time point, peak value and duration of each vibration wave are compared with the corresponding preset time point threshold range, preset peak threshold value range and preset duration threshold range, and if all are within the preset threshold range, it is determined that the circuit breaker is operating normally , otherwise it is determined that the circuit breaker operates abnormally;

Determine the components that generate the abnormal vibration wave according to the position of the circuit breaker corresponding to the abnormal vibration wave;

According to the abnormal time point, peak value, duration value and the components that generate the abnormal vibration wave, the conditions to be verified that cause the abnormal operation are obtained.

In a fifth implementation manner of the present disclosure, the preset time point threshold value range, the preset peak value threshold value range, and the preset duration threshold value range are determined in the following manner:

With the goal of meeting the service life of the circuit breaker, the vibration tester data of several circuit breakers that have been tested are selected, and the maximum and minimum values The maximum value and the minimum value respectively determine the preset time point threshold value range, the preset peak value threshold value range and the preset duration threshold value range; wherein, the sensor setting position of the vibration tester when the threshold value range is determined and the vibration when detecting the defective parts of the circuit breaker The tester has the same sensor setup locations.

In a sixth implementation manner of the present disclosure, in step S3, before setting the parameters of the simulation model according to the conditions to be verified, and before obtaining the simulation result, the method further includes:

The parameters of the simulation model are initialized according to the actual working conditions of the circuit breaker, and the parameters of the simulation model are adjusted to meet the requirements of the national standard of the circuit breaker.

In a seventh implementation manner of the present disclosure, the detection method further includes:

S5: Replace the target abnormal component, and repeat steps S1-S5 until no abnormal operation of the circuit breaker occurs.

According to the technical solutions provided by the embodiments of the present disclosure, the defective parts of the circuit breaker are detected by combining the mechanical characteristic instrument and the vibration tester, and the same time reference point is set when analyzing the collected data of the mechanical characteristic instrument and the vibration tester. The mechanical characteristics instrument data and abnormal vibration tester data are used to obtain the conditions to be verified that cause abnormal operation, and then the conditions to be verified are verified one by one through the simulation model. The variation trend of abnormal operation is simulated, and the abnormal component is determined as the target abnormal component. The technical solution analyzes the abnormal vibration wave generated by the movement of the circuit breaker, and then finds the parts that generate the abnormal vibration wave according to the mechanical characteristic instrument data at the same time point, and then preliminarily analyzes the abnormal operation based on the data of the abnormal vibration wave. It is further verified whether the abnormal components initially judged are indeed defective, and finally the target abnormal components are obtained based on the simulation results, so that the defective components can be found and replaced in the early stage of the operation of the circuit breaker, which avoids the potential safety hazards during the use of the circuit breaker, and ensures the safety of the circuit breaker. The circuit breaker is safe to use and saves after-sale costs.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

Other features, objects and advantages of the present disclosure will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the attached image:

FIG. 1 shows a schematic flowchart of a method for detecting defective parts of a circuit breaker according to an embodiment of the present disclosure;

Figure 2a shows a schematic diagram of the collected vibration tester data when the oil buffer joint is closed;

Figure 2b shows a schematic diagram of the collected vibration tester data at the oil buffer joint when the brake is opened;

Fig. 3a shows the data schematic diagram of the vibration tester when the collected closing hold catcher is closed;

Figure 3b shows a schematic diagram of the vibration tester data collected when the closing and holding latch is opened;

Figure 4a shows a schematic diagram of the collected mechanical characteristic instrument data when the circuit breaker is closed;

Figure 4b shows a schematic diagram of the collected mechanical characteristic instrument data when the circuit breaker is opened;

Figure 5 shows the standard vibration data threshold range table of 220KV porcelain column circuit breakers;

FIG. 6 shows a schematic diagram of the comparison of vibration acceleration after modifying oil buffer parameters and within the standard threshold range;

Fig. 7 is a schematic diagram showing the comparison of the vibration acceleration in the range of the standard threshold value after modifying the size of the closing latch.

Detailed ways

Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. Also, for the sake of clarity, parts unrelated to describing the exemplary embodiments are omitted from the drawings.

In the present disclosure, it should be understood that terms such as "comprising" or "having" are intended to indicate the presence of features, numbers, steps, acts, components, parts, or combinations thereof disclosed in this specification, and are not intended to exclude a or multiple other features, numbers, steps, acts, components, parts, or combinations thereof may exist or be added.

In addition, it should be noted that the embodiments of the present disclosure and the features of the embodiments may be combined with each other under the condition of no conflict. The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

In the prior art, most of the detection methods for mechanical characteristics are mechanical characteristic instruments. Since the characteristic detection results of each circuit breaker cannot be completely unified, the national standard or the standard range of each company has a wide margin. When there are defective parts inside the circuit breaker, since the early stage of the defective parts has little effect on the speed and displacement of the circuit breaker, the mechanical characteristic instrument cannot be used to diagnose at this time, so the conclusion that conforms to the national standard or the standard of each company can be obtained. However, with the accumulation of the circuit breaker operation times, the missing component will have serious deformation, interference and other problems, which will have a greater impact on the speed and displacement of the circuit breaker. At this time, the mechanical characteristic instrument can be used to detect the fault. If a circuit breaker with defective parts is assembled into a substation, as the circuit breaker operates a certain number of times, it will easily fail and seriously affect safety, which also increases the company's after-sales service costs.

According to the technical solutions provided by the embodiments of the present disclosure, the abnormal vibration wave generated by the movement of the circuit breaker is analyzed, and then the parts that generate the abnormal vibration wave are found according to the mechanical characteristic instrument data at the same time point, and then the data of the abnormal vibration wave is preliminarily analyzed. The reason for the abnormal operation is further verified by the simulation model to determine whether the abnormal components are indeed defective. Finally, the target abnormal components are obtained based on the simulation results, so that the defective components can be found and replaced in the early stage of the operation of the circuit breaker, avoiding the use of the circuit breaker. The safety hazards that appear, ensure the safe use of the circuit breaker and save after-sales costs.

FIG. 1 shows a schematic flowchart of a method for detecting a defective part of a circuit breaker according to an embodiment of the present disclosure. As shown in FIG. 1 , the method for detecting defective parts of a circuit breaker includes the following steps S1-S4:

In step S1, connect the mechanical characteristic instrument to the circuit breaker to collect the mechanical characteristic instrument data of the circuit breaker, and connect the vibration tester to the circuit breaker to collect the vibration test instrument data of the circuit breaker, wherein the mechanical characteristic instrument data and the vibration tester The data are set with the same time reference point.

In the present disclosure, the time reference point of the mechanical characteristic instrument data and the vibration test instrument data is set to be the same, and any one of the following methods is adopted:

The first way is to trigger the mechanical characteristic tester and the vibration tester at the same time, and use the time point t1 triggered at the same time as the time reference point. For example, connect the opening coil and closing coil of the circuit breaker to the vibration tester respectively. When the opening coil and closing coil of the circuit breaker and the trigger circuit of the vibration tester are energized at the same time, the time point t1 as a time reference point. It should be noted that, the mechanical characteristic instrument may be connected to the circuit breaker in advance at any time before the time point t1, and the data of the mechanical characteristic instrument may be collected, which is not limited in the present disclosure.

The second method is to connect the break line of the circuit breaker to the vibration tester, trigger the vibration tester when the break of the circuit breaker is opened, and use the time point t2 as the time reference point. It should be noted that, at any time before the time point t2, the mechanical characteristic instrument can be connected to the circuit breaker in advance, and the data of the mechanical characteristic instrument can be collected, which is not limited in the present disclosure.

In the disclosed manner, when collecting data of the vibration tester, the sensor of the vibration tester is arranged on one or both of the following components of the circuit breaker: the oil buffer joint or the closing latch. It can be understood that the sensors of the vibration tester can also be arranged on other key transmission parts of the circuit breaker or parts that frequently fail, which is not limited in the present disclosure.

In the disclosed manner, the vibration tester data at least includes: the time point, peak value and duration of each vibration wave; the mechanical characteristic instrument data at least includes: the position of the circuit breaker corresponding to each vibration wave. For example, set the instrument to collect data 1s after t1, collect the first vibration wave and the second vibration wave within 1s, and record the time point, peak value and duration of the first vibration wave, and the time of the second vibration wave accordingly. point, peak value and duration, and then record the position of the circuit breaker corresponding to the time point of the first vibration wave, and record the position of the circuit breaker corresponding to the time point of the second vibration wave.

In the present disclosure, the mechanical characteristic instrument data and vibration tester data collected at the same time reference point can be used to jointly analyze the abnormal vibration wave of the circuit breaker at the stroke position, because the collected data have the same time reference This solves the technical problem that the defective parts cannot be found by the data of the mechanical characteristic instrument when the cumulative number of operations of the circuit breaker is small, and the defective parts can be found by the abnormal vibration waves of the defective parts compared with the normal parts, and the vibration waves occur. The mechanical characteristic instrument data corresponding to the time point is located, and the defective part is located, so as to realize the preliminary judgment of whether the circuit breaker is operating normally.

In step S2, it is determined whether the circuit breaker operates normally according to the vibration tester data, and when abnormal operation occurs, the conditions to be verified that cause the abnormal operation are obtained according to the mechanical characteristic instrument data and the abnormal vibration tester data.

In the present disclosure, to determine whether the circuit breaker is operating normally, it is necessary to compare the time point, peak value and duration of each vibration wave with the corresponding preset time point threshold range, preset peak threshold value range and preset duration threshold range. If both are within the preset threshold range, it is determined that the circuit breaker is operating normally; otherwise, it is determined that the circuit breaker is operating abnormally. For example, the preset time point threshold range of the first vibration wave is t _a -t _b , the preset peak threshold value range g _a -g _b and the preset duration threshold value range λ _a -λ _b , where a and b represent thresholds respectively The end point of the range, when the time point t of the first vibration wave is between t _a -t _b , and the peak value g of the first vibration wave is between g _a -g _b , and the duration λ of the first vibration wave is Between λ _a and λ _b , the circuit breaker displayed by the first vibration wave is considered to be operating normally; similarly, if the detected second vibration wave and the Nth vibration wave (N is an integer greater than 1) both indicate that the circuit breaker is operating If it is normal, then synthesizing the vibration tester data from the first vibration wave to the Nth vibration wave, it can be concluded that the circuit breaker is operating normally.

If one or more abnormal vibration waves appear in each vibration wave, it is considered that the circuit breaker operates abnormally. Wherein, if each vibration wave has one or more data outside the threshold range, the vibration wave is considered to be an abnormal vibration wave. For example, if the time point t of the first vibration wave is not between t _a and t _b , but the peak value g of the first vibration wave is between g _a and g _b , and the duration λ of the first vibration wave is between λ _a -λ _b , the first vibration wave is still considered to be an abnormal vibration wave. It can be understood that when one or more data of the time point, peak value and duration of the first vibration wave are not within the threshold range, the first vibration wave is also considered to be an abnormal vibration wave.

It should be noted that, after the vibration test data is used to determine that the circuit breaker operates normally, it can be further determined whether the circuit breaker operates normally through the data of the mechanical characteristic instrument. Specifically, the position threshold range l _a -l _b of the circuit breaker corresponding to the Nth vibration wave can be set, for example, the position threshold range l _a1 -l _b1 of the circuit breaker corresponding to the first vibration wave, if the circuit breaker corresponding to the first vibration wave If the position l is between l _a1 -l _b1 , the circuit breaker is considered to be operating normally, otherwise it is considered that the circuit breaker is operating abnormally.

In the disclosed manner, after the abnormal vibration wave is determined, the components that generate the abnormal vibration wave can be determined according to the position of the circuit breaker corresponding to the abnormal vibration wave. Then, according to the abnormal time point, peak value, duration value and the component that generates the abnormal vibration wave, the conditions to be verified that cause the abnormal operation are obtained. The abnormal component can be a circuit breaker component where the sensor of the vibration tester is located, such as an oil buffer joint, etc. Therefore, it can be determined based on experience or the workpiece parameters of the currently used oil buffer joint to verify the occurrence of this abnormality. condition, the abnormal component can also be the component corresponding to the operating position of the circuit breaker, that is to say, other components move to the position of the circuit breaker and vibrate with the abnormal component there to generate abnormal vibration waves, so one of the conditions to be verified is Verify the abnormal components at the circuit breaker position corresponding to the abnormal vibration wave.

In the present disclosure, the preset time point threshold range, the preset peak threshold value range, and the preset duration threshold value range are determined in the following manner:

With the goal of meeting the service life of the circuit breaker, the vibration tester data of several circuit breakers that have been tested are selected, and the maximum and minimum values The maximum value and the minimum value respectively determine the preset time point threshold value range, the preset peak value threshold value range and the preset duration threshold value range; wherein, the sensor setting position of the vibration tester when the threshold value range is determined and the vibration when detecting the defective parts of the circuit breaker The tester has the same sensor setup locations.

Taking the M2 class circuit breaker required by the national standard as an example, its mechanical life is more than 10,000 times. When determining the threshold range of the time point, considering that the data collected by the sensors of the vibration tester installed in different positions has a large error, the sensor installation position of the circuit breaker under the test conditions is the same as that of the circuit breaker under the actual working conditions, and the test conditions It can also be carried out with reference to the actual working conditions, thereby reducing the system error, and then using the circuit breaker under the test conditions to obtain the threshold range. Under the working conditions, if the vibration tester data collected at the same installation position of the circuit breaker is within the threshold range, there is a high probability that the circuit breaker will not be abnormal during the operation of the mechanical life of 10,000 times. Specifically, for a circuit breaker that meets the service life of the circuit breaker, several groups of circuit breakers can be selected as needed to count the time range of the occurrence of each vibration wave under the condition that the cumulative number of actions is small (such as 500 or 800 times). The maximum and minimum values of , and then use the statistical minimum and maximum time points as the time point threshold range. It can be understood that when the time point threshold range is determined, the peak threshold value range and the duration threshold value range can be determined, which will not be repeated in this disclosure.

In step S3, a simulation model of the circuit breaker is established, parameters of the simulation model are set according to the conditions to be verified, and a simulation result is obtained.

In step S4, when the simulation result can simulate the change trend of abnormal operation, the target abnormal component is determined; otherwise, the current condition to be verified is excluded, and steps S3-S4 are repeated to obtain the simulation result of the next condition to be verified, until it is determined The target abnormal component is removed.

In the method of the present disclosure, in the simulation model, the position of the circuit breaker corresponding to the abnormal vibration wave is found, the parameters of the relevant components are modified, and the defects are simulated. In the simulation results, when the change trend of the time point, peak value, duration and the position of the circuit breaker when the vibration acceleration occurs is the same as the change trend of the data collected in step S1, it is considered that the components of the changed parameters are likely to cause the circuit breaker The target exception component that is running abnormally.

In the disclosed method, the conditions to be verified obtained in step S2 are verified one by one using the simulation model to simulate the changing trend of abnormal operation of the circuit breaker, which can effectively avoid misjudgment of abnormal components and improve the detection accuracy.

According to an embodiment of the present disclosure, in step S3, before setting the parameters of the simulation model according to the conditions to be verified and obtaining the simulation result, the method further includes:

The parameters of the simulation model are initialized according to the actual working conditions of the circuit breaker, and the parameters of the simulation model are adjusted to meet the requirements of the national standard of the circuit breaker.

In the present disclosure, by adjusting the parameters of the simulation model, the characteristic curve in the simulation model conforms to the national standard or the requirements of each company, and at the same time, the time point at which the vibration acceleration occurs and the position of the circuit breaker in the simulation are adjusted to correspond to the corresponding threshold range.

According to an embodiment of the present disclosure, the detection method further includes:

S5: Replace the target abnormal component, and repeat steps S1-S5 until no abnormal operation of the circuit breaker occurs.

According to the technical solutions provided by the embodiments of the present disclosure, the abnormal vibration wave generated by the movement of the circuit breaker is analyzed, and then the parts that generate the abnormal vibration wave are found according to the mechanical characteristic instrument data at the same time point, and then the data of the abnormal vibration wave is preliminarily analyzed. The reason for the abnormal operation is further verified by the simulation model to determine whether the abnormal components are indeed defective. Finally, the target abnormal components are obtained based on the simulation results, so that the defective components can be found and replaced in the early stage of the operation of the circuit breaker, avoiding the use of the circuit breaker. The safety hazards that appear, ensure the safe use of the circuit breaker and save after-sales costs.

The technical solutions of the present disclosure will be described below through specific examples.

Now take a 220KV porcelain column circuit breaker as an example to illustrate the method for detecting defective parts of a circuit breaker provided by the present disclosure. The fracture line of the porcelain column circuit breaker is connected to the vibration tester, and the vibration tester is triggered at the same time as the fracture is powered and lost, and the instrument is set to collect vibration data with a duration of 1s before and after the trigger.

The vibration acceleration sensor 1 is arranged at the oil buffer joint. Figure 2a shows the schematic diagram of the collected vibration tester data when the oil buffer joint is closed, and Figure 2b shows the collected vibration tester when the oil buffer joint is open. Schematic diagram of the data; the vibration acceleration sensor 2 is arranged at the closing hold latch, Figure 3a shows the collected schematic diagram of the vibration tester data at the closing hold latch when the switch is closed, and Figure 3b shows the collected closing hold The schematic diagram of the vibration tester data when the switch is opened; Fig. 4a shows the data schematic diagram of the mechanical characteristic instrument collected when the circuit breaker is closed, and Fig. 4b shows the data schematic diagram of the mechanical characteristic instrument collected when the circuit breaker is open, Among them, the time point corresponding to the position of the interrupted line in Fig. 4a and Fig. 4b is the time reference point; Fig. 5 shows the standard vibration data threshold range table of 220KV porcelain column circuit breaker.

Oil buffer joint

Comparing the vibration tester data collected in Figure 2a and Figure 2b with the corresponding threshold range in Figure 5, it can be seen that the first vibration wave to the fourth vibration wave occurs when the oil buffer joint collected in Figure 2a is closed. The time point, peak value and duration of , are all within the threshold range corresponding to FIG. 5 , and the corresponding circuit breaker position collected in FIG. 4 a is also within the threshold range corresponding to FIG. 5 . The time point of the third vibration wave when the brake is opened at the oil buffer joint collected in Figure 2b is 1022.2ms, which exceeds the corresponding 1025±2ms in Figure 5, and the peak value of the third vibration wave of 5548g exceeds the corresponding 1500±500g in Figure 5. The vibration tester data during other openings are within the threshold range, so it can be preliminarily judged that the third vibration wave is an abnormal vibration wave. By corresponding to the time point of the circuit breaker position collected in Figure 4b, when the third vibration wave occurs, the circuit breaker The position is 0.8mm, which is in the range of 0-4mm corresponding to Figure 5.

Since the closing data at the oil buffer joint is normal, the time point of the third vibration wave of opening is shortened and the peak value is increased. When the third vibration wave occurs, the position of the circuit breaker is 0.8mm. At the end of the opening, the conditions to be verified may be obtained. It is because the buffer force provided by the oil buffer joint during the opening buffer is too small, which causes the circuit breaker to move quickly and the impact force is large.

In the simulation model, the parameters of the oil buffer joint are modified to reduce the opening buffer force. Figure 6 shows the comparison diagram of the vibration acceleration after the modification of the oil buffer parameters and the standard threshold range. Increase, the duration of the third vibration wave and the corresponding position of the circuit breaker after changing the oil buffer parameters are still within the threshold range, which is consistent with the change trend of the abnormal vibration wave actually collected. Therefore, it can be considered that the oil buffer joint is the target abnormal component , After replacing the normal oil buffer joint on site, the collected data is normal and the defect is eliminated.

close and hold

Comparing the vibration tester data collected in Fig. 3a and Fig. 3b with the corresponding threshold range in Fig. 5, it can be seen that the peak value of the second vibration wave is 3800g when the closing hold latch collected in Fig. 3a is closed. The corresponding 2500±300g in Figure 5, the duration of the second vibration wave is 11ms, which exceeds the corresponding 5±2ms in Figure 5, and the vibration tester data at other closing times are within the threshold range, so the second vibration can be preliminarily judged. The wave is an abnormal vibration wave. Corresponding to the time point of the position of the circuit breaker collected in Figure 4a, the position of the circuit breaker was 198mm when the second vibration wave occurred, which was within the range of 198-202mm corresponding to Figure 5. The time point, peak value and duration of the first vibration wave to the second vibration wave when the closing and holding catcher is opened collected in Fig. 3b are all within the threshold range corresponding to Fig. 5, and the corresponding circuit breaker position collected in Fig. 4b is also within the threshold range corresponding to Figure 5.

Due to the normal opening data of the closing switch, the duration of the second vibration wave during closing increases and the peak value increases. When the second vibration wave occurs, the position of the circuit breaker is 198mm. At the end of the closing period, it is concluded that the condition to be verified may be closing. The speed of the retaining clip and the buckle shaft is fast, the number of collisions is large, and the stability is slow, which leads to an increase in the peak value and duration of the second vibration wave.

In the simulation model, the size of the closing latch is modified to increase the clearance between the closing latch and the buckle shaft. Figure 7 shows a schematic diagram of the comparison of the vibration acceleration between the modified closing latch size and the standard threshold range. From this, it can be seen that the duration of the vibration acceleration increases, the peak value increases, the time point of the vibration wave is lagging behind the standard but still within the threshold range, and the corresponding position of the circuit breaker is still within the threshold range, which is different from the actual collected abnormality. The change trend of the vibration wave remains the same, so it can be considered that the closing and holding catcher is the target abnormal component. After the normal closing and holding catcher is replaced on site, the collected data is normal and the defect is eliminated.

The above description is merely a preferred embodiment of the present disclosure and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, and should also cover the above-mentioned technical features without departing from the inventive concept. Other technical solutions formed by any combination of its equivalent features. For example, a technical solution is formed by replacing the above features with the technical features disclosed in the present disclosure (but not limited to) with similar functions.

Claims (8)

1. A detection method for defective parts of a circuit breaker, comprising the steps of: S1: Connect the mechanical characteristic instrument to the circuit breaker to collect the mechanical characteristic instrument data of the circuit breaker, and connect the vibration tester to the circuit breaker to collect the vibration test instrument data of the circuit breaker, wherein the mechanical characteristic instrument data and the vibration test instrument data are provided with the same time reference point; S2: Determine whether the circuit breaker operates normally according to the vibration tester data, and when abnormal operation occurs, obtain the conditions to be verified that cause the abnormal operation according to the mechanical characteristic instrument data and the abnormal vibration tester data; S3: establish a simulation model of the circuit breaker, set simulation model parameters according to the conditions to be verified, and obtain a simulation result; S4: when the simulation result can simulate the change trend of abnormal operation, determine the target abnormal component; otherwise, exclude the current condition to be verified, repeat steps S3-S4, and obtain the simulation result of the next condition to be verified, until the target abnormality is determined part. 2. method according to claim 1, is characterized in that, in step S1, the time reference point that described mechanical characteristic instrument data and vibration tester data are identical is set, adopts any one of the following ways: Simultaneously trigger the mechanical characteristic meter and the vibration tester; Connect the breaker break wire to the vibration tester. 3. The method according to claim 1 or 2, characterized in that, when collecting vibration tester data in step S1, the sensor of the vibration tester is arranged on one or both of the following components of the circuit breaker: oil buffer joint Or close the brake and keep it. 4. The method according to claim 3, wherein the vibration tester data at least includes: the time point, peak value and duration of each vibration wave; the mechanical characteristic instrument data at least includes: the open circuit corresponding to each vibration wave device location. 5. The method according to claim 4, wherein in step S2, it is determined whether the circuit breaker operates normally according to the data of the vibration tester, and when abnormal operation occurs, according to the data of the mechanical characteristic instrument and the abnormal vibration The tester data gets the conditions to be verified that cause the abnormal operation, implemented as: The time point, peak value and duration of each vibration wave are compared with the corresponding preset time point threshold range, preset peak threshold value range and preset duration threshold range, and if all are within the preset threshold range, it is determined that the circuit breaker is operating normally , otherwise it is determined that the circuit breaker operates abnormally; Determine the components that generate the abnormal vibration wave according to the position of the circuit breaker corresponding to the abnormal vibration wave; According to the abnormal time point, peak value, duration value and the components that generate the abnormal vibration wave, the conditions to be verified that cause the abnormal operation are obtained. 6. The method according to claim 5, wherein the preset time point threshold range, the preset peak threshold value range and the preset duration threshold value range are determined in the following manner: With the goal of meeting the service life of the circuit breaker, the vibration tester data of several circuit breakers that have been tested are selected, and the maximum and minimum values The maximum value and the minimum value respectively determine the preset time point threshold value range, the preset peak value threshold value range and the preset duration threshold value range; wherein, the sensor setting position of the vibration tester when the threshold value range is determined and the vibration when detecting the defective parts of the circuit breaker The tester has the same sensor setup location. 7. The method according to claim 1, characterized in that, in step S3, before setting simulation model parameters according to the conditions to be verified and obtaining the simulation result, further comprising: The parameters of the simulation model are initialized according to the actual working conditions of the circuit breaker, and the parameters of the simulation model are adjusted to meet the requirements of the national standard of the circuit breaker. 8. The method of claim 1, further comprising: S5: Replace the target abnormal component, and repeat steps S1-S5 until no abnormal operation of the circuit breaker occurs.

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