CN111504627A - Method for detecting defective parts of circuit breaker - Google Patents
Method for detecting defective parts of circuit breaker Download PDFInfo
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- CN111504627A CN111504627A CN202010378941.4A CN202010378941A CN111504627A CN 111504627 A CN111504627 A CN 111504627A CN 202010378941 A CN202010378941 A CN 202010378941A CN 111504627 A CN111504627 A CN 111504627A
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Abstract
The embodiment of the disclosure discloses a method for detecting a defective component of a circuit breaker, which comprises the following steps: s1: connecting a mechanical characteristic instrument with a breaker to acquire the mechanical characteristic instrument data of the breaker, and connecting a vibration tester with the breaker to acquire the vibration tester data of the breaker; s2: determining whether the breaker normally operates according to the data of the vibration tester, and obtaining a condition to be verified which causes abnormal operation according to the data of the mechanical characteristic tester and the abnormal data of the vibration tester when the operation is abnormal; s3: establishing a simulation model of the circuit breaker, and setting simulation model parameters according to the to-be-verified condition to obtain a simulation result; s4: and when the simulation result can simulate the variation trend of the operation abnormity, determining a target abnormal component. According to the technical scheme, the potential safety hazard of the circuit breaker in the using process is avoided, the using safety of the circuit breaker is ensured, and the after-sale cost is saved.
Description
Technical Field
The disclosure relates to the technical field of data analysis, in particular to a method for detecting a defective component of a circuit breaker.
Background
The circuit breaker is a very critical device in the power transmission and distribution system, and the operation state of the circuit breaker directly affects the operation stability and the power supply reliability of the power system. Mechanical faults are the main faults of high voltage circuit breakers and it is therefore particularly important to detect the mechanical characteristics of the circuit breakers.
In the prior art, most of detection means for mechanical characteristics are mechanical characteristic instruments, and because the characteristic detection results of all circuit breakers cannot be completely unified, the margin of the standard range of national standards or all companies is very wide. When a defective component exists in the circuit breaker, because the influence of the early stage of the defective component on the speed and the displacement of the circuit breaker is small, the mechanical characteristic instrument cannot be used for diagnosing the defective component, and therefore the conclusion that the defective component meets the national standard or the standard range of each company can be obtained. However, as the number of times of circuit breaker operation is accumulated, the defective parts are severely deformed and interfered, and further, the speed and displacement of the circuit breaker are greatly affected, and at this time, the fault can be detected by the mechanical characteristic instrument. For example, the national standard requires that the mechanical life of an M2-class circuit breaker exceeds 10000 times, the number of partial closing times of a general circuit breaker in a factory does not exceed 500 times, and the defect of the circuit breaker cannot be diagnosed through a mechanical characteristic instrument. If the circuit breaker with the defective parts is assembled to the distribution station, it is easy to malfunction and seriously affect safety as the circuit breaker is operated a certain number of times, which also increases the after-sales service cost of the company. Therefore, a technical scheme for detecting a defective component when the cumulative operation number of the circuit breaker is small is needed.
Disclosure of Invention
In order to solve the problems in the related art, the embodiments of the present disclosure provide a method for detecting a defective component of a circuit breaker.
The embodiment of the disclosure provides a method for detecting a defective component of a circuit breaker.
Specifically, the detection method comprises the following steps:
s1: connecting a mechanical characteristic instrument with a circuit breaker to acquire mechanical characteristic instrument data of the circuit breaker, and connecting a vibration tester with the circuit breaker to acquire vibration tester data of the circuit breaker, wherein the mechanical characteristic instrument data and the vibration tester data are provided with the same time reference point;
s2: determining whether the breaker normally operates according to the data of the vibration tester, and obtaining a condition to be verified which causes abnormal operation according to the data of the mechanical characteristic tester and the abnormal data of the vibration tester when the operation is abnormal;
s3: establishing a simulation model of the circuit breaker, and setting simulation model parameters according to the to-be-verified condition to obtain a simulation result;
s4: when the simulation result can simulate the change trend of the operation abnormity, determining a target abnormal component; otherwise, the current condition to be verified is eliminated, and the steps S3-S4 are repeated to obtain the simulation result of the next condition to be verified until the target abnormal component is determined.
In a first implementation manner, the time reference point of the mechanical characteristic meter data which is the same as the vibration tester data is set in step S1, and any one of the following manners is adopted:
simultaneously triggering a mechanical characteristic instrument and a vibration tester;
and connecting the breaker break line with a vibration tester.
In a second implementation manner, when the vibration tester data is collected in step S1, the sensor of the vibration tester is arranged on one or two of the following components of the circuit breaker: the oil buffer joint or the closing holding pawl.
In a third implementation of the present disclosure, the vibration tester data includes at least: the time point, peak value and duration of each vibration wave; the mechanical profiler data includes at least: the breaker position corresponding to each vibration wave.
In a fourth implementation manner of the present disclosure, in step S2, determining whether the circuit breaker normally operates according to the vibration tester data, and when an abnormal operation occurs, obtaining a condition to be verified that causes the abnormal operation according to the mechanical characteristic meter data and the abnormal vibration tester data, is implemented as:
respectively comparing the time point, the peak value and the duration of each vibration wave with a corresponding preset time point threshold range, a preset peak value threshold range and a preset duration threshold range, if the time point, the peak value and the duration of each vibration wave are all within the preset threshold range, determining that the circuit breaker normally operates, and otherwise, determining that the circuit breaker abnormally operates;
determining parts generating abnormal vibration waves according to the position of the circuit breaker corresponding to the abnormal vibration waves;
and obtaining conditions to be verified which cause abnormal operation according to the abnormal time point, peak value and time length value and the parts which generate the abnormal vibration waves.
In a fifth implementation manner, the preset time point threshold range, the preset peak threshold range, and the preset duration threshold range are determined as follows:
with the service life of the breaker as a target, selecting vibration tester data of a plurality of tested breakers, respectively determining a time point threshold range, a peak value threshold range, a maximum value and a minimum value of a duration threshold range, and respectively determining a preset time point threshold range, a preset peak value threshold range and a preset duration threshold range according to the corresponding maximum value and the corresponding minimum value; and the sensor setting position of the vibration tester when the threshold range is determined is the same as the sensor setting position of the vibration tester when the defect part of the circuit breaker is detected.
In a sixth implementation manner of the present disclosure, before the step S3 sets the simulation model parameters according to the condition to be verified to obtain the simulation result, the method further includes:
initializing simulation model parameters according to the actual using conditions of the circuit breaker, and adjusting the simulation model parameters by taking national standard requirements of the circuit breaker as targets.
In a seventh implementation manner, the detection method further includes:
s5: and replacing the target abnormal component, and repeating the steps S1-S5 until the circuit breaker has no abnormal operation condition.
According to the technical scheme provided by the embodiment of the disclosure, a mechanical characteristic instrument and a vibration tester are combined to detect a defective component of a circuit breaker, the same time reference point is set when the collected mechanical characteristic instrument data and the collected vibration tester data are analyzed, conditions to be verified which cause abnormal operation are obtained according to the mechanical characteristic instrument data and the abnormal vibration tester data, then the conditions to be verified are verified one by one through a simulation model, and in the conditions to be verified, if a simulation result obtained according to a certain condition to be verified can simulate the change trend of the abnormal operation, the abnormal component is determined as a target abnormal component. According to the technical scheme, abnormal vibration waves generated by the movement of the circuit breaker are analyzed, then the parts generating the abnormal vibration waves are found according to the data of the mechanical characteristic instrument at the same time point, the reasons of the abnormal vibration waves are analyzed primarily, whether the abnormal parts which are judged primarily are defective is further verified through a simulation model, and finally the target abnormal parts are obtained by combining the simulation result, so that the defective parts can be found and replaced at the early stage of the operation of the circuit breaker, the potential safety hazard of the circuit breaker in the use process is avoided, the use safety of the circuit breaker is guaranteed, and the after-sale cost is saved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
Other features, objects, and advantages of the present disclosure will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a flow diagram of a method of detecting a defective component of a circuit breaker according to an embodiment of the present disclosure;
FIG. 2a shows a schematic diagram of vibration tester data collected at closing of an oil buffer joint;
FIG. 2b shows a schematic view of vibration tester data collected during opening at an oil buffer joint;
FIG. 3a is a schematic view showing the collected data of the vibration tester at the time of closing of the closing holding pawl;
FIG. 3b is a schematic diagram showing the collected data of the vibration tester when the closing holding pawl is opened;
fig. 4a is a schematic diagram illustrating collected data of a mechanical characteristic instrument when the circuit breaker is switched on;
FIG. 4b is a schematic diagram showing the collected data of the mechanical characteristic instrument when the breaker is opened;
FIG. 5 shows a table of threshold ranges for standard vibration data for a 220KV porcelain knob type circuit breaker;
FIG. 6 is a graphical representation of vibration acceleration versus a standard threshold range after modification of oil buffer parameters;
figure 7 shows a schematic diagram of the vibration acceleration in comparison with a standard threshold range after modification of the dimensions of the closing holding pawl.
Detailed Description
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 not relevant to the description of the exemplary embodiments are omitted in the drawings.
In the present disclosure, it is to be understood that terms such as "including" or "having," etc., are intended to indicate the presence of the disclosed features, numbers, steps, behaviors, components, parts, or combinations thereof, and are not intended to preclude the possibility that one or more other features, numbers, steps, behaviors, components, parts, or combinations thereof may be present or added.
It should be further noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In the prior art, most of detection means for mechanical characteristics are mechanical characteristic instruments, and because the characteristic detection results of all circuit breakers cannot be completely unified, the margin of the standard range of national standards or all companies is very wide. When a defective component exists in the circuit breaker, because the influence of the early stage of the defective component on the speed and the displacement of the circuit breaker is small, the mechanical characteristic instrument cannot be used for diagnosing the defective component, and therefore the conclusion that the defective component meets the national standard or the standard range of each company can be obtained. However, as the number of times of circuit breaker operation is accumulated, the defective parts are severely deformed and interfered, and further, the speed and displacement of the circuit breaker are greatly affected, and at this time, the fault can be detected by the mechanical characteristic instrument. If the circuit breaker with the defective parts is assembled to the distribution station, it is easy to malfunction and seriously affect safety as the circuit breaker is operated a certain number of times, which also increases the after-sales service cost of the company.
According to the technical scheme provided by the embodiment of the disclosure, abnormal vibration waves generated by the movement of the circuit breaker are analyzed, then parts generating the abnormal vibration waves are found out according to the data of the mechanical characteristic instrument at the same time point, the reason of the abnormal vibration waves is preliminarily analyzed, whether the preliminarily judged abnormal parts have defects is further verified through a simulation model, and finally, the target abnormal parts are obtained by combining the simulation result, so that the defective parts can be found and replaced at the early stage of the operation of the circuit breaker, the potential safety hazard of the circuit breaker in the use process is avoided, the use safety of the circuit breaker is ensured, and the after-sale cost is also saved.
Fig. 1 shows a flow diagram of a method of detecting a defective component of a circuit breaker according to an embodiment of the present disclosure. As shown in fig. 1, the method for detecting a defective part of a circuit breaker includes the following steps S1-S4:
in step S1, the mechanical characteristic meter is connected to the circuit breaker to collect mechanical characteristic meter data of the circuit breaker, and the vibration tester is connected to the circuit breaker to collect vibration tester data of the circuit breaker, wherein the mechanical characteristic meter data and the vibration tester data are provided with the same time reference point.
In this disclosure, a time reference point is set, where the mechanical characteristic meter data is the same as the vibration tester data, and any one of the following methods is adopted:
in the first method, the mechanical characteristic meter and the vibration tester are triggered simultaneously, and the time point t1 of the simultaneous triggering is used as a time reference point. For example, the opening coil and the closing coil of the circuit breaker are respectively connected with the vibration tester, and when the opening coil and the closing coil of the circuit breaker are simultaneously electrified with the trigger circuit of the vibration tester, the time point t1 at the moment is taken as a time reference point. It should be noted that, at any time before the time point t1, the mechanical characteristic meter may be connected to the circuit breaker in advance to collect the data of the mechanical characteristic meter, which is not limited by the present disclosure.
In the second method, the breaker breaking line is connected to a vibration tester, the vibration tester is triggered while the breaker breaking line is opened, and the time t2 at that time is used as a time reference point. It should be noted that, at any time before the time point t2, the mechanical characteristic meter may be connected to the circuit breaker in advance to collect the data of the mechanical characteristic meter, which is not limited by the present disclosure.
In this disclosure, when collecting the data of the vibration tester, the sensor of the vibration tester is disposed on one or two of the following components of the circuit breaker: the oil buffer joint or the closing holding pawl. It will be appreciated that the sensors of the vibration tester may also be located on other critical transmission components of the circuit breaker or on components that often fail, as the present disclosure is not limited thereto.
In an aspect of the present disclosure, the vibration tester data includes at least: the time point, peak value and duration of each vibration wave; the mechanical profiler data includes at least: the breaker position corresponding to each vibration wave. For example, the setting instrument acquires data 1s after t1, acquires a first vibration wave and a second vibration wave within 1s, correspondingly records a time point, a peak value and duration of the first vibration wave and a time point, a peak value and duration of the second vibration wave, then records a position of the circuit breaker corresponding to the time point of the first vibration wave, and records a position of the circuit breaker corresponding to the time point of the second vibration wave.
In the method, the mechanical characteristic instrument data and the vibration tester data which are acquired at the same time reference point are utilized, the abnormity of the vibration wave of the breaker at the stroke position can be analyzed in a combined manner, the acquired data have the same time reference point, so that the technical problem that when the accumulated action times of the breaker is small, the defective part cannot be found by the mechanical characteristic instrument data is solved, the defective part can be found by the abnormity of the vibration wave of the defective part compared with the vibration wave of the normal part, and the defective part is positioned by the mechanical characteristic instrument data corresponding to the time point of the vibration wave generation, so that the primary judgment on whether the breaker normally operates is realized.
In step S2, it is determined whether the circuit breaker is operating normally according to the vibration tester data, and when an operation abnormality occurs, a condition to be verified that causes the operation abnormality is obtained according to the mechanical characteristic tester data and the abnormal vibration tester data.
In the method, whether the breaker normally operates needs to be determined by respectively comparing the time point, the peak value and the duration of each vibration wave with the corresponding preset time point threshold range, the preset peak value threshold range and the preset duration threshold range, if all the time point, the peak value and the duration are within the preset threshold range, the breaker normally operates, and otherwise, the breaker abnormally operates. For example, the preset time point threshold range of the first vibration wave is ta-tbA preset peak threshold range ga-gbAnd a preset time length threshold value range lambdaa-λbWherein a and b respectively represent the end points of the threshold range, and the time point t of the first vibration wave is ta-tbWhile satisfying that the peak value g of the first vibration wave is at ga-gbWhile satisfying the condition that the time length lambda of the first vibration wave is at lambdaa-λbIn the meantime, the breaker displayed by the first vibration wave is considered to be normally operated; similarly, if the detected second vibration wave and the detected nth vibration wave (N is an integer greater than 1) both indicate that the circuit breaker is operating normally, the data of the vibration tester from the first vibration wave to the nth vibration wave are integrated, and the conclusion that the circuit breaker is operating normally can be obtained.
And if one or more abnormal vibration waves appear in each vibration wave, the breaker is considered to be abnormal in operation. And if data outside one or more threshold ranges appear in each vibration wave, the vibration wave is considered as an abnormal vibration wave. For example, if the time point t of the first vibration wave is not at ta-tbWhile satisfying that the peak value g of the first vibration wave is at ga-gbWhile satisfying the condition that the time length lambda of the first vibration wave is at lambdaa-λbIn between, the first vibration wave is still considered as an abnormal vibration wave. It is understood that the first vibration wave is also considered as an abnormal vibration wave when one or more of the data of the time point, the peak value and the duration of the first vibration wave is not within the threshold range.
It should be noted that, after the vibration test data is used to determine that the circuit breaker is operating normally, the mechanical characteristic meter data can be further used to determine whether the circuit breaker is operating normally. Specifically, a breaker position threshold range l corresponding to the nth vibration wave may be seta-lbFor example, the first vibration wave corresponds to a breaker position threshold range la1-lb1If the breaker position l corresponding to the first vibration wave is at la1-lb1And otherwise, the circuit breaker is considered to be in normal operation, and the circuit breaker is considered to be in abnormal operation.
In the present disclosure, after the abnormal vibration wave is identified, the component generating the abnormal vibration wave may be identified based on the breaker position corresponding to the abnormal vibration wave. And then obtaining the condition to be verified which causes the abnormal operation according to the abnormal time point, peak value and time length value and the part which generates the abnormal vibration wave. The abnormal component may be a circuit breaker component at a position where a sensor of the vibration tester is located, for example, an oil buffer joint, so that a to-be-verified condition that causes the abnormality may be determined according to experience or a workpiece parameter of the currently used oil buffer joint, the abnormal component may also be a component corresponding to an operating position of the circuit breaker, that is, the abnormal vibration wave is generated when other components move to the position of the circuit breaker and vibrate with the abnormal component at the position, and one of the to-be-verified conditions is the abnormal component at the position of the circuit breaker corresponding to the verification abnormal vibration wave.
In this disclosure, the preset time point threshold range, the preset peak threshold range, and the preset duration threshold range are determined as follows:
with the service life of the breaker as a target, selecting vibration tester data of a plurality of tested breakers, respectively determining a time point threshold range, a peak value threshold range, a maximum value and a minimum value of a duration threshold range, and respectively determining a preset time point threshold range, a preset peak value threshold range and a preset duration threshold range according to the corresponding maximum value and the corresponding minimum value; and the sensor setting position of the vibration tester when the threshold range is determined is the same as the sensor setting position of the vibration tester when the defect part of the circuit breaker is detected.
Taking the M2 grade breaker as an example, the mechanical life of the breaker is more than 10000 times. When the time point threshold value range is determined, the data error collected by the sensor of the vibration tester is large in consideration of different positions, therefore, the installation positions of the circuit breaker under the test condition are the same as the installation positions of the sensor of the circuit breaker under the actual working condition, and the test condition can be carried out according to the actual working condition, so that the system error is reduced, then the threshold value range is obtained by utilizing the circuit breaker under the test condition, because the circuit breakers under the test condition meet the requirement of 10000 times of mechanical life of the circuit breaker, therefore, under the actual working condition, if the vibration tester data collected at the same installation position of the circuit breaker are in the threshold value range, the circuit breaker can not be abnormal in the operation process of 10000 times of mechanical life by the probability. Specifically, for the circuit breaker that meets the service life of the circuit breaker, several groups of circuit breakers may be selected as needed to count the maximum value and the minimum value of the time point range of each vibration wave occurrence under the condition that the cumulative action number is small (for example, 500 times or 800 times), and then the counted time point minimum value and maximum value are used as the time point threshold range. It is understood that the peak threshold range and the duration threshold range may be determined at the same time as the time point threshold range is determined, which is not described in detail in this disclosure.
In step S3, a simulation model of the circuit breaker is established, and parameters of the simulation model are set according to the condition to be verified, so as to obtain a simulation result.
In step S4, when the simulation result can simulate the variation trend of the operation abnormality, determining a target abnormal component; otherwise, the current condition to be verified is eliminated, and the steps S3-S4 are repeated to obtain the simulation result of the next condition to be verified until the target abnormal component is determined.
In the method, the position of the circuit breaker corresponding to the abnormal vibration wave is found in the simulation model, parameters of relevant parts are modified, and defects are simulated. In the simulation result, when the variation trend of the time point, the peak value, the duration and the breaker position of the occurrence of the vibration acceleration is the same as the variation trend of the data collected in step S1, it is considered that the component with the changed parameter is likely to be the target abnormal component causing the abnormal operation of the breaker.
In the present disclosure, the conditions to be verified obtained in step S2 are verified one by using a simulation model to simulate a variation trend of the circuit breaker operation anomaly, which can effectively avoid misjudgment of the abnormal component and improve the detection accuracy.
According to the embodiment of the present disclosure, before the step S3 sets the simulation model parameters according to the condition to be verified to obtain the simulation result, the method further includes:
initializing simulation model parameters according to the actual using conditions of the circuit breaker, and adjusting the simulation model parameters by taking national standard requirements of the circuit breaker as targets.
In the method, the characteristic curve in the simulation model is made to meet the national standard or the requirements of each company by adjusting the parameters of the simulation model, and meanwhile, the time point of the occurrence of the vibration acceleration and the position of the 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: and replacing the target abnormal component, and repeating the steps S1-S5 until the circuit breaker has no abnormal operation condition.
According to the technical scheme provided by the embodiment of the disclosure, abnormal vibration waves generated by the movement of the circuit breaker are analyzed, then parts generating the abnormal vibration waves are found out according to the data of the mechanical characteristic instrument at the same time point, the reason of the abnormal vibration waves is preliminarily analyzed, whether the preliminarily judged abnormal parts have defects is further verified through a simulation model, and finally, the target abnormal parts are obtained by combining the simulation result, so that the defective parts can be found and replaced at the early stage of the operation of the circuit breaker, the potential safety hazard of the circuit breaker in the use process is avoided, the use safety of the circuit breaker is ensured, and the after-sale cost is also saved.
The technical solution of the present disclosure is illustrated below by specific examples.
The method for detecting the defect part of the circuit breaker provided by the disclosure is described by taking a 220KV porcelain column type circuit breaker as an example, the circuit breaker is connected with a mechanical characteristic instrument and a vibration tester, a time reference point is set in a second mode, namely, a fracture line of the 220KV porcelain column type circuit breaker is led out and connected to the vibration tester, the vibration tester is triggered when the fracture is powered off, and the vibration data of the time length before and after triggering is collected by the device.
Arranging a vibration acceleration sensor 1 at an oil buffer joint, wherein a schematic diagram of collected vibration tester data when the oil buffer joint is switched on is shown in fig. 2a, and a schematic diagram of collected vibration tester data when the oil buffer joint is switched off is shown in fig. 2 b; arranging a vibration acceleration sensor 2 at a closing holding engine, wherein fig. 3a shows a collected vibration tester data schematic diagram when the closing holding engine is closed, and fig. 3b shows a collected vibration tester data schematic diagram when the closing holding engine is opened; fig. 4a shows a schematic diagram of collected data of a mechanical characteristic instrument when the circuit breaker is switched on, and fig. 4b shows a schematic diagram of collected data of a mechanical characteristic instrument when the circuit breaker is switched off, wherein time points corresponding to positions of an interrupt wire in fig. 4a and fig. 4b are time reference points; fig. 5 shows a table of standard vibration data threshold ranges for a 220KV porcelain knob type circuit breaker.
Oil buffer joint
Comparing the vibration tester data collected in fig. 2a and 2b with the corresponding threshold ranges in fig. 5, it can be seen that: the time point, the peak value and the duration of the first to fourth vibration waves when the oil buffer joint is closed are all in the threshold range corresponding to fig. 5, and the corresponding breaker position collected in fig. 4a is also in the threshold range corresponding to fig. 5. The time point of occurrence of the third vibration wave when the oil buffer joint is opened, which is collected in fig. 2b, is 1022.2ms which exceeds 1025 +/-2 ms corresponding to fig. 5, the peak value 5548g of the third vibration wave exceeds 1500 +/-500 g corresponding to fig. 5, and the vibration tester data during other opening operations are within the threshold range, so that the third vibration wave can be preliminarily judged to be an abnormal vibration wave, and the time point of occurrence of the third vibration wave corresponds to the time point of the breaker position collected in fig. 4b, the breaker position when the third vibration wave occurs is 0.8mm, and the time point of occurrence of the third vibration wave is within the 0-4mm range corresponding to fig. 5.
Because closing data at the oil buffer joint is normal, the time point of the third vibration wave of the opening is shortened, the peak value is increased, the position of the breaker is 0.8mm when the third vibration wave occurs, and the condition to be verified is obtained at the last stage of the opening, namely that the buffer force provided by the oil buffer joint during the opening buffer is too small, so that the breaker is high in movement speed and large in impact force.
In the simulation model, the parameters of the oil buffer joint are modified to reduce the opening buffer force, fig. 6 shows a schematic diagram of comparison between the modified oil buffer parameters and the vibration acceleration within a standard threshold range, and it can be seen that the time of the vibration acceleration is shortened, the peak value is increased, the duration of the third vibration wave after the oil buffer parameters are changed and the corresponding position of the circuit breaker are still within the threshold range and are consistent with the variation trend of the actually acquired abnormal vibration wave, so that the oil buffer joint can be regarded as a target abnormal component, and after the normal oil buffer joint is replaced on site, the acquired data are normal, and the defects are eliminated.
Closing holding pawl
Comparing the vibration tester data collected in fig. 3a and 3b with the corresponding threshold ranges in fig. 5, it can be seen that: the peak value of the second vibration wave collected in fig. 3a when the closing holding pawl is closed is 3800g exceeding 2500 ± 300g corresponding to fig. 5, the duration of the second vibration wave is 11ms exceeding 5 ± 2ms corresponding to fig. 5, and the vibration tester data during other closing is within the threshold range, so that the second vibration wave can be preliminarily judged to be an abnormal vibration wave, and the circuit breaker position is 198mm when the second vibration wave occurs, and is within the range of 198-plus-202 mm corresponding to fig. 5, corresponding to the time point of the circuit breaker position collected in fig. 4 a. The time point, the peak value and the duration of the first vibration wave to the second vibration wave when the closing holding pawl is opened, which are collected in fig. 3b, are all within the threshold range corresponding to fig. 5, and the corresponding breaker position, which is collected in fig. 4b, is also within the threshold range corresponding to fig. 5.
Because closing keeps sincere son punishment floodgate data normal, and closing second vibration wave length of time increases and the peak value increases, and the circuit breaker position is 198mm when the second vibration wave takes place, and at closing final stage, it is fast to obtain the condition of awaiting verification probably when closing keeps sincere son and fastening shaft lock joint, and the number of times of collision is many, and is stable slow to lead to second vibration wave peak value increase, length of time increase.
In the simulation model, the size of the closing keeping pawl is modified to increase the gap between the closing keeping pawl and the fastening shaft, fig. 7 shows a schematic diagram comparing the modified size of the closing keeping pawl with the vibration acceleration in a standard threshold range, so that the time length of the vibration acceleration is increased, the peak value is increased, the time point of the vibration wave generation is delayed compared with the standard and still in the threshold range, the position of the corresponding breaker is still in the threshold range and keeps consistent with the actually acquired abnormal vibration wave variation trend, therefore, the closing keeping pawl can be regarded as a target abnormal part, and the acquired data is normal and the defects are eliminated after the normal closing keeping pawl is replaced on site.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention in the present disclosure is not limited to the specific combination of the above-mentioned features, but also encompasses other embodiments in which any combination of the above-mentioned features or their equivalents is possible without departing from the inventive concept. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.
Claims (8)
1. A method for detecting a defective component of a circuit breaker, comprising the steps of:
s1: connecting a mechanical characteristic instrument with a circuit breaker to acquire mechanical characteristic instrument data of the circuit breaker, and connecting a vibration tester with the circuit breaker to acquire vibration tester data of the circuit breaker, wherein the mechanical characteristic instrument data and the vibration tester data are provided with the same time reference point;
s2: determining whether the breaker normally operates according to the data of the vibration tester, and obtaining a condition to be verified which causes abnormal operation according to the data of the mechanical characteristic tester and the abnormal data of the vibration tester when the operation is abnormal;
s3: establishing a simulation model of the circuit breaker, and setting simulation model parameters according to the to-be-verified condition to obtain a simulation result;
s4: when the simulation result can simulate the change trend of the operation abnormity, determining a target abnormal component; otherwise, the current condition to be verified is eliminated, and the steps S3-S4 are repeated to obtain the simulation result of the next condition to be verified until the target abnormal component is determined.
2. The method according to claim 1, wherein the step S1 of setting the time reference point of the mechanical property meter data and the vibration tester data is performed by any one of the following methods:
simultaneously triggering a mechanical characteristic instrument and a vibration tester;
and connecting the breaker break line with a vibration tester.
3. The method of claim 1 or 2, wherein the vibration tester data is collected in step S1, and the vibration tester sensors are disposed on one or both of the following components of the circuit breaker: the oil buffer joint or the closing holding pawl.
4. The method of claim 3, wherein the vibration tester data includes at least: the time point, peak value and duration of each vibration wave; the mechanical profiler data includes at least: the breaker position corresponding to each vibration wave.
5. The method according to claim 4, wherein the step S2 of determining whether the breaker is operating normally according to the vibration tester data, and obtaining the condition to be verified causing the abnormal operation according to the mechanical characteristic meter data and the abnormal vibration tester data when the abnormal operation occurs is implemented as follows:
respectively comparing the time point, the peak value and the duration of each vibration wave with a corresponding preset time point threshold range, a preset peak value threshold range and a preset duration threshold range, if the time point, the peak value and the duration of each vibration wave are all within the preset threshold range, determining that the circuit breaker normally operates, and otherwise, determining that the circuit breaker abnormally operates;
determining parts generating abnormal vibration waves according to the position of the circuit breaker corresponding to the abnormal vibration waves;
and obtaining conditions to be verified which cause abnormal operation according to the abnormal time point, peak value and time length value and the parts which generate the abnormal vibration waves.
6. The method according to claim 5, wherein the preset time threshold range, the preset peak threshold range and the preset duration threshold range are determined as follows:
with the service life of the breaker as a target, selecting vibration tester data of a plurality of tested breakers, respectively determining a time point threshold range, a peak value threshold range, a maximum value and a minimum value of a duration threshold range, and respectively determining a preset time point threshold range, a preset peak value threshold range and a preset duration threshold range according to the corresponding maximum value and the corresponding minimum value; and the sensor setting position of the vibration tester when the threshold range is determined is the same as the sensor setting position of the vibration tester when the defect part of the circuit breaker is detected.
7. The method according to claim 1, wherein before the step S3 of setting simulation model parameters according to the condition to be verified to obtain the simulation result, the method further comprises:
initializing simulation model parameters according to the actual using conditions of the circuit breaker, and adjusting the simulation model parameters by taking national standard requirements of the circuit breaker as targets.
8. The method of claim 1, further comprising:
s5: and replacing the target abnormal component, and repeating the steps S1-S5 until the circuit breaker has no abnormal operation condition.
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