Gravity isolation switch fault diagnosis method, device and system
By collecting current data from multiple monitoring positions of the gravity isolating switch, building a fitting curve and analyzing the arc burn characteristics, the problem of insignificant contact failure caused by arc burn is solved, and the accuracy of fault diagnosis is improved.
Patent Information
- Application Number
- CN202510215175.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2025-05-23
AI Technical Summary
In the prior art, contact failures caused by arc burns are not obvious, and the fault diagnosis effect is poor, making it difficult to accurately identify the contact failure of the arc burn isolating switch.
By obtaining the current data of multiple monitoring positions during gravity isolation closing, a fitted curve is constructed, the arc burn fluctuation and oscillation decay of the curve segments is obtained, the local characteristics of arc burns, the consistency of current path degradation and the difference in current dynamic responses are analyzed, and the degree of arc burns is evaluated and fault diagnosis is performed.
It improves the accuracy of fault diagnosis, can accurately obtain the degree of arc burn at the contact position, and avoids misdiagnosis or misdiagnosis of contact faults caused by arc burns.
Smart Images
Figure CN120028686A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of fault diagnosis, and in particular to a method, device and system for diagnosing faults of a gravity isolating switch. Background Art
[0002] In the process of realizing circuit disconnection and isolation functions, the opening and closing actions of the gravity disconnector will generate arcs, which can easily cause contact burn failures. Therefore, by collecting and analyzing the operation data of the gravity disconnector, fault diagnosis can be achieved, equipment damage and power system failures can be prevented, thereby ensuring the safe and stable operation of the power grid.
[0003] In the prior art, the threshold current method is used to monitor the current data of the contact position, but there are differences in the current fluctuations at different monitoring positions. In the process of diagnosing the heating failure of the disconnector contact through the current data, the increase in overload current will also cause current fluctuations, making the contact failure caused by arc burns not obvious. The real arc burn disconnector contact failure is difficult to accurately identify, and the fault diagnosis effect is poor. Summary of the invention
[0004] In order to solve the technical problem that the contact failure caused by arc burns is not obvious and the fault diagnosis effect is poor, the purpose of the present invention is to provide a gravity disconnector fault diagnosis method, device and system, and the technical solution adopted is as follows:
[0005] The present invention provides a gravity isolating switch fault diagnosis method, the method comprising:
[0006] Acquire current data of multiple monitoring positions at each moment when the gravity disconnector is closed, wherein the multiple monitoring positions include a contact position and multiple positions on both sides of the contact;
[0007] Construct a fitting curve of all current data at each monitoring position to obtain multiple curve segments of the fitting curve; obtain the arc burn fluctuation degree and oscillation attenuation degree of each curve segment according to the distribution of current data on each curve segment;
[0008] According to the oscillation attenuation degree between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact and the arc burn fluctuation degree, the arc burn local characteristics between the corresponding segments are obtained; according to the arc burn local characteristics between each curve segment at the contact position and the corresponding curve segments at different positions on both sides of the contact, the current path degradation consistency of each curve segment at the contact position is obtained; according to the current path degradation consistency, the relative distance between the contact position and the different positions on both sides of the contact and the arc burn local characteristics, the current dynamic response difference of each curve segment at the contact position is obtained;
[0009] According to the difference in the current dynamic response of each curve segment at the contact position and the arc burn fluctuation degree, the arc burn degree of each curve segment is obtained;
[0010] According to the arc burn degree, fault diagnosis is performed on the gravity disconnector.
[0011] Furthermore, the method for obtaining the curve segmentation includes:
[0012] For the contact point position, obtain the maximum and minimum points on the fitting curve; select the range between each maximum point and the adjacent minimum points on both sides to form the corresponding curve segment;
[0013] The fitting curves of the remaining monitoring positions are divided according to the time range of the curve segments corresponding to the contact positions, so as to obtain a plurality of curve segments corresponding to the remaining monitoring positions.
[0014] Furthermore, the method for obtaining the fluctuation degree of arc burns includes:
[0015] The difference mean between different adjacent current data on each curve segment is obtained as the first difference; and the ratio between the first difference and the time length of the corresponding curve segment is obtained as the arc burn fluctuation degree.
[0016] Furthermore, the method for obtaining the oscillation attenuation degree includes:
[0017] The length of the time range between the time corresponding to the maximum current data and the time corresponding to the last current data in each curve segment is obtained as the fluctuation recovery time;
[0018] The ratio of the maximum current data and the fluctuation recovery time of each curve segment is obtained, and the product between the ratio result and the variance of the current data within the fluctuation recovery time range is calculated as the oscillation attenuation degree of each curve segment.
[0019] Furthermore, the method for obtaining the local characteristics of arc burns includes:
[0020] According to the difference in oscillation attenuation between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact, as well as the difference in arc burn fluctuation degree, the local characteristics of arc burns between the corresponding segments are obtained. The difference in oscillation attenuation is positively correlated with the local characteristics of arc burns, and the difference in arc burn fluctuation degree is negatively correlated with the local characteristics of arc burns.
[0021] Furthermore, the method for obtaining the current path degradation consistency includes:
[0022] Obtaining the ratio of the arc burn local characteristics between each curve segment at the contact position and the data segments on the curve segment corresponding to each position on each side of the contact, and the arc burn local characteristics corresponding to the data segment at the latter position, as a first ratio;
[0023] The difference between each curve segment of the contact position and the corresponding first ratio between the two sides of the contact within the same time range is obtained, and negative correlation mapping is performed as the current path degradation consistency of each curve segment of the contact position.
[0024] Furthermore, the method for obtaining the current dynamic response difference includes:
[0025] Obtaining a cumulative sum of the contact position and the relative distances between different positions on both sides of the contact as a first cumulative sum;
[0026] According to the relative distance between the contact position and different positions on both sides of the contact, weighted accumulation is performed on the arc burn local characteristics between each curve segment of the contact position and the corresponding curve segments at different positions on both sides of the contact as a second accumulated sum;
[0027] The ratio of the first accumulated value to the second accumulated value is obtained, and the product of the ratio result and the current path degradation consistency of each curve segment at the contact position is calculated as the current dynamic response difference of each curve segment at the contact position.
[0028] Furthermore, the method for obtaining the arc burn degree includes:
[0029] The product of the current dynamic response difference of each curve segment at the contact position and the arc burn fluctuation degree is obtained as the arc breakdown probability;
[0030] The difference in arc breakdown probability between each curve segment and other curve segments at the contact position is obtained as the arc burn degree of each curve segment.
[0031] The present invention also proposes a gravity disconnector fault diagnosis device, including a data acquisition module, an arc burn fluctuation and attenuation analysis module, a dynamic response difference calculation module, a burn degree assessment module and a fault diagnosis module:
[0032] Data acquisition module: acquires current data of multiple monitoring positions at each moment when the gravity disconnector is closed, wherein the multiple monitoring positions include a contact position and multiple positions on both sides of the contact;
[0033] Arc burn fluctuation and attenuation analysis module: construct a fitting curve of all current data at each monitoring position to obtain multiple curve segments of the fitting curve; obtain the arc burn fluctuation degree and oscillation attenuation of each curve segment according to the distribution of current data on each curve segment;
[0034] Dynamic response difference calculation module: according to the oscillation attenuation degree between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact and the arc burn fluctuation degree, the arc burn local characteristics between the corresponding segments are obtained; according to the arc burn local characteristics between each curve segment at the contact position and the corresponding curve segments at different positions on both sides of the contact, the current path degradation consistency of each curve segment at the contact position is obtained; according to the current path degradation consistency, the relative distance between the contact position and the different positions on both sides of the contact, and the arc burn local characteristics, the current dynamic response difference of each curve segment at the contact position is obtained;
[0035] Burn degree assessment module: obtain the arc burn degree of each curve segment according to the current dynamic response difference of each curve segment at the contact position and the arc burn fluctuation degree;
[0036] Fault diagnosis module: performs fault diagnosis on the gravity disconnector according to the arc burn degree.
[0037] The present invention also proposes a gravity isolating switch fault diagnosis system, wherein the system stores programs or instructions, and when the programs or instructions are executed by a processor, the steps of the gravity isolating switch fault diagnosis method described above are implemented.
[0038] The present invention has the following beneficial effects:
[0039] The present invention constructs a fitting curve of all current data at each monitoring position, obtains multiple curve segments of the fitting curve, and more intuitively understands the changing trend of the current data, which is convenient for observing and comparing the current changes at different positions and different time periods; according to the distribution of current data on each curve segment, the arc burn fluctuation degree and oscillation attenuation degree of each curve segment are obtained; according to the oscillation attenuation degree and arc burn fluctuation degree between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact, the local characteristics of the arc burn between the corresponding segments are obtained, the difference between the contact position and the surrounding positions is found, and the characteristics of the local arc burn are revealed; according to each curve segment at the contact position The local characteristics of arc burns between the curve segments corresponding to different positions on both sides of the contact are used to obtain the fluctuation degradation of the current conduction path of each curve segment at the contact position, reflecting the regular phenomenon that changes with the arc burn degree or time; according to the consistency of current path degradation, the relative distance between the contact position and different positions on both sides of the contact, and the local characteristics of arc burns, the difference in the current dynamic response of each curve segment at the contact position is obtained to reveal the influence of arc burns on the dynamic performance of the contact; according to the difference in the current dynamic response of each curve segment at the contact position and the degree of arc burn fluctuation, the arc burn degree of each curve segment is obtained; and the gravity disconnector is fault diagnosed. The present invention improves the accuracy of fault diagnosis by obtaining the accurate arc burn degree of the contact position. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0041] Figure 1 A flow chart of a gravity isolating switch fault diagnosis method provided by one embodiment of the present invention;
[0042] Figure 2 A flow chart of a method for obtaining a current dynamic response difference provided by an embodiment of the present invention;
[0043] Figure 3 A structural block diagram of a gravity isolating switch fault diagnosis device provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0044] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a gravity disconnector fault diagnosis method, device and system proposed by the present invention, its specific implementation, structure, features and effects in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.
[0045] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
[0046] The specific scheme of a gravity isolating switch fault diagnosis method, device and system provided by the present invention is described in detail below with reference to the accompanying drawings.
[0047] See also Figure 1 , which shows a flow chart of a gravity isolating switch fault diagnosis method provided by an embodiment of the present invention, and the specific method includes:
[0048] Step S1: obtaining current data of multiple monitoring positions at each moment when the gravity disconnector is closed, wherein the multiple monitoring positions include a contact position and multiple positions on both sides of the contact.
[0049] In an embodiment of the present invention, since the contact failure caused by arc burns is not obvious and the safety hazard it brings is relatively serious, it is necessary to compare and analyze the current data of multiple monitoring positions to comprehensively capture the current fluctuations at different positions in the circuit and avoid missed diagnosis or misdiagnosis problems that may be caused by single-point monitoring; first, a Hall effect sensor with suitable acquisition requirements and circuit parameters is selected and arranged at the monitoring position of the gravity isolating switch for non-contact monitoring of the current data of multiple monitoring positions at the same time, and the current data of multiple monitoring positions at each moment when the gravity isolating switch is closed is obtained, and the multiple monitoring positions include the contact position and multiple positions on both sides of the contact.
[0050] It should be noted that, in one embodiment of the present invention, the moving contact and the static contact are closed in the gravity isolating switch to form a loop, and the current data is monitored at multiple monitoring positions; at the contact position, which is the main occurrence point of arc burns, it is helpful to collect local current characteristics; the contact has a moving contact side and a static contact side, and multiple positions on both sides of the contact are analyzed at positions 5 meters away and 10 meters away on one side of the moving and static contacts, respectively, which is helpful to monitor the fluctuation of the overall current; the monitoring position can be set by the implementer according to the specific situation, and is not limited or elaborated here.
[0051] It should be noted that in the embodiments of the present invention, in order to facilitate the subsequent data processing, after the acquired data is cleaned and denoised, the data can also be standardized to eliminate the dimension of the data, so that indicators of different units or orders of magnitude can be comprehensively analyzed and compared to ensure the accuracy of subsequent analysis. Standardization can adopt existing methods such as Z-score standardization and maximum and minimum standardization. The specific means are technical means well known to those skilled in the art and will not be described in detail here.
[0052] Step S2: construct a fitting curve of all current data at each monitoring position to obtain multiple curve segments of the fitting curve; obtain the arc burn fluctuation degree of each curve segment according to the distribution of current data on each curve segment, and obtain the oscillation attenuation degree of each curve segment.
[0053] The fitting curve can more accurately reflect the actual change trend of the current data at each monitoring location. By observing the shape and slope of the fitting curve, the physical law behind the data can be revealed. The fitting curve of all current data at each monitoring location is constructed to obtain multiple curve segments of the fitting curve.
[0054] Preferably, in one embodiment of the present invention, the method for obtaining curve segments includes:
[0055] For the contact point position, obtain the maximum and minimum points on the fitting curve; select the range between each maximum point and the adjacent minimum points on both sides to form the corresponding curve segment;
[0056] The fitting curves of the remaining monitoring positions are divided according to the time range of the curve segments corresponding to the contact positions, so as to obtain a plurality of curve segments corresponding to the remaining monitoring positions.
[0057] It should be noted that, in some embodiments of the present invention, the fitting curve can be fitted by existing fitting methods such as least squares method and polynomial fitting. The specific means are technical means well known to those skilled in the art and are not limited or elaborated here.
[0058] The contact is the core area where the arc occurs. Burns directly affect the current fluctuation characteristics, resulting in high-frequency transient current fluctuations. Analyzing the distribution of current data can help understand the changing trend of current data, so as to more accurately capture the instantaneous changes and fluctuations of the current, and quantify the arc burn fluctuation degree and oscillation attenuation of each curve segment; according to the distribution of current data on each curve segment, the arc burn fluctuation degree and oscillation attenuation of each curve segment are obtained.
[0059] Preferably, in one embodiment of the present invention, the method for obtaining arc burn symptoms includes:
[0060] Obtaining a mean difference between different adjacent current data on each curve segment as a first difference;
[0061] The ratio between the first difference and the time length of the corresponding curve segment is obtained as the arc burn fluctuation degree.
[0062] In one embodiment of the present invention, the formula for the fluctuation degree of arc burns is expressed as:
[0063]
[0064] Among them, F i Indicates the arc burn fluctuation degree of the i-th curve segment; R i Represents the number of current data on the i-th curve segment; I i,r represents the rth current data value on the i-th curve segment; I i,r+1 represents the r+1th current data value on the i-th curve segment; X i Indicates the time length of the i-th curve segment.
[0065] In the formula for the fluctuation degree of arc burns, It represents the mean difference between different adjacent current data on the i-th curve segment, that is, the first difference. The greater the difference between different adjacent current data, the greater the current fluctuation, and the more likely arc burns will occur. The smaller the time length of the i-th curve segment, the shorter the time when the fluctuation occurs, the more instantaneous it is, the more it manifests as arc burns, and the greater the fluctuation degree of arc burns.
[0066] Preferably, in one embodiment of the present invention, the method for obtaining the oscillation attenuation degree includes:
[0067] The length of the time range between the time corresponding to the maximum current data and the time corresponding to the last current data in each curve segment is obtained as the fluctuation recovery time;
[0068] The ratio of the maximum current data and the fluctuation recovery time of each curve segment is obtained, and the product between the ratio result and the variance of the current data within the fluctuation recovery time range is calculated as the oscillation attenuation degree of each curve segment.
[0069] In one embodiment of the present invention, the formula for the oscillation attenuation is expressed as:
[0070]
[0071] Among them, B i represents the oscillation attenuation of the i-th curve segment; H i represents the maximum value of the current data of the i-th curve segment; T i represents the fluctuation recovery time of the i-th curve segment; V iRepresents the variance of the current data within the fluctuation recovery time range.
[0072] In the formula of oscillation attenuation, the larger the maximum value of current data, the shorter the fluctuation recovery time, which means that the time used for curve segment fluctuation recovery is shorter, the attenuation decreases faster, and the oscillation attenuation is greater; the larger the variance of current data within the fluctuation recovery time range, the more uneven the distribution of current data, the more unstable the current recovery, and the greater the oscillation attenuation.
[0073] Step S3: According to the oscillation attenuation degree between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact and the arc burn fluctuation degree, the arc burn local characteristics between the corresponding segments are obtained; according to the arc burn local characteristics between each curve segment at the contact position and the corresponding curve segments at different positions on both sides of the contact, the current path degradation consistency of each curve segment at the contact position is obtained; according to the current path degradation consistency, the relative distance between the contact position and different positions on both sides of the contact and the arc burn local characteristics, the current dynamic response difference of each curve segment at the contact position is obtained.
[0074] During the opening and closing process, a strong arc burn may be caused. If the current load of the current circuit is large, the current fluctuation degree at different monitoring positions may be more severe. By comparing the current recovery conditions at different current monitoring positions, the accuracy of arc burn judgment can be improved with the help of the concentrated effect of local arc burns. If the contact is not burned by the arc, the current fluctuation and overall trend of the recovery process at the contact position and other monitoring points should be similar. If an arc burn occurs, there will be differential current fluctuations between the contact and the remote position. According to the oscillation attenuation between each curve segment at the contact position and the corresponding curve segments at each position on both sides of the contact and the arc burn fluctuation degree, the local characteristics of arc burns between the corresponding segments are obtained.
[0075] Preferably, in one embodiment of the present invention, the method for obtaining the local characteristics of arc burns includes:
[0076] According to the difference in oscillation attenuation between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact, as well as the difference in arc burn fluctuation degree, the local characteristics of arc burns between the corresponding segments are obtained. The difference in oscillation attenuation is positively correlated with the local characteristics of arc burns, and the difference in arc burn fluctuation degree is negatively correlated with the local characteristics of arc burns.
[0077] In one embodiment of the present invention, the formula for the local characteristics of arc burns is expressed as:
[0078]
[0079] Among them, G i,dB represents the local characteristics of arc burns between the i-th curve segment at the contact position and the corresponding curve segments at the d-th position on both sides of the contact; i represents the oscillation attenuation of the i-th curve segment at the contact position; B i,d represents the oscillation attenuation of the curve segment corresponding to the dth position on both sides of the contact at the i-th curve segment of the contact position; F i represents the arc burn characteristics of the i-th curve segment at the contact position; F i,d It represents the arc burn characteristics of the curve segment corresponding to the d-th position on both sides of the contact at the i-th curve segment of the contact position; || represents the absolute value.
[0080] In the formula for the local characteristics of arc burns, |B i ―B i,d | represents the difference in oscillation attenuation between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact, |F i ―F i,d |Indicates the difference in arc burn fluctuation degree between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact. The greater the difference in oscillation attenuation, the smaller the difference in arc burn fluctuation degree. When the arc burn fluctuation degree is closer, the difference in current recovery attenuation is greater, indicating that there is a problem with the current recovery procedure at the contact position, which is more likely to be caused by contact burns and has local characteristics of arc burns.
[0081] Arc burns will lead to increased contact resistance, which in turn affects the conduction path of the current. The difference in the degree of burns at different positions reflects the unevenness of the current distribution, which leads to the degradation of the current path. According to the local characteristics of arc burns between each curve segment at the contact position and the corresponding curve segments at different positions on both sides of the contact, the consistency of the current path degradation of each curve segment at the contact position is obtained.
[0082] Preferably, in one embodiment of the present invention, the method for obtaining the current path degradation consistency includes:
[0083] Obtaining the ratio of the arc burn local characteristics between each curve segment at the contact position and the curve segment corresponding to each position on each side of the contact, and the arc burn local characteristics corresponding to the data segment at the latter position, as a first ratio;
[0084] The difference of the first ratio between each curve segment of the contact position and different sides of the contact is obtained, and negative correlation mapping is performed as the current path degradation consistency of each curve segment of the contact position.
[0085] In one embodiment of the present invention, the formula for the current path degradation consistency is expressed as:
[0086]
[0087] Among them, Z i G represents the degradation consistency of the current path of the i-th curve segment at the contact position; i,c represents the local characteristics of arc burn between the i-th curve segment at the contact position and the corresponding curve segment at the c-th position on one side of the contact; G i,c+1 represents the local characteristics of arc burn between the i-th curve segment at the contact position and the corresponding curve segment at the c+1-th position on one side of the contact; G′ i,c G′ represents the local characteristics of arc burn between the i-th curve segment at the contact position and the corresponding curve segment at the c-th position on the other side of the contact; i,c+1 It represents the local characteristics of arc burn between the i-th curve segment at the contact position and the corresponding curve segment at the c+1-th position on the other side of the contact; exp() represents an exponential function with a natural constant as the base.
[0088] In the equation for current path degradation consistency, The ratio of the arc burn local characteristics between the i-th curve segment at the contact position and the curve segment corresponding to the c-th position on one side of the contact, and the arc burn local characteristics corresponding to the data segment at the c+1-th position is used as the first ratio; The difference between the first ratio between the i-th curve segment representing the contact position and the different sides of the contact is converted to For negative correlation mapping, the greater the difference in the first ratio, the more dissimilar the changes in the local characteristics of the arc burn, and the smaller the impact of the arc burn may be. The closer the difference in the first ratio, the more similar the changes on both sides of the contact, the greater the consistency of the current path degradation, and the more consistent it is with the change of the current fluctuation caused by the arc burn with distance degradation.
[0089] The consistency of current path degradation and the local characteristics of arc burns reflect the performance characteristics of the current response at the contact position and other monitoring positions. The greater the difference in current dynamic response, the more consistent it is with the characteristic performance of arc burns. Considering the propagation characteristics of arc burns in space, the relative distance can more accurately describe the impact range of arc burns. The greater the relative distance, the more credible the local characteristics of arc burns. By combining and analyzing multiple data, the differences in current dynamic response at the contact position are comprehensively evaluated, revealing the impact of arc burns on the dynamic performance of the contact. According to the consistency of current path degradation, the relative distance between the contact position and different positions on both sides of the contact, and the local characteristics of arc burns, the difference in current dynamic response of each curve segment at the contact position is obtained.
[0090] Preferably, in one embodiment of the present invention, the method for obtaining the current dynamic response difference can be found in Figure 2 , which shows a flow chart of a method for obtaining a current dynamic response difference, including:
[0091] Step S201: obtaining a cumulative sum of a contact position and relative distances between different positions on both sides of the contact as a first cumulative sum.
[0092] By analyzing the distances between different positions, the overall distance relationship between the contact position and the surrounding environment is evaluated. The larger the distance, the smaller the degree of mutual influence between different positions.
[0093] It should be noted that, in some embodiments of the present invention, the relative distance can be obtained by existing distance calculation methods such as Euclidean distance and Manhattan distance. The specific means are technical means well known to those skilled in the art and will not be described in detail here.
[0094] Step S202: according to the relative distance between the contact position and different positions on both sides of the contact, weighted accumulation is performed on the arc burn local characteristics between each curve segment of the contact position and the corresponding curve segments at different positions on both sides of the contact as a second accumulated sum.
[0095] The relative distance is used as the weight to perform weighted accumulation of each curve segment of the contact position and the local characteristics of the arc burn at the corresponding position. Taking into account the influence of different positions on the arc burn characteristics of the contact position, the accumulation result is more in line with the actual situation. The larger the relative distance, the more credible the performance of the corresponding local characteristics of the arc burn.
[0096] Step S203: obtaining a ratio of the first accumulated value to the second accumulated value, and calculating the product of the ratio result and the current path degradation consistency of each curve segment at the contact position as the current dynamic response difference of each curve segment at the contact position.
[0097] In one embodiment of the present invention, the formula for the current dynamic response difference is expressed as:
[0098]
[0099] Among them, P i represents the current dynamic response difference of the i-th curve segment at the contact position; Z i represents the degradation consistency of the current path of the i-th curve segment at the contact position; W represents the number of monitoring positions; D d Represents the relative distance between the contact position and the dth monitoring position; G i,d It represents the local characteristics of arc burn between the i-th curve segment at the contact position and the corresponding curve segment at the d-th position on both sides of the contact.
[0100] In the formula for the difference in current dynamic response, It means that the relative distance between the contact position and the dth monitoring position is used as the weight, and the local characteristics of arc burn between the i-th curve segment of the contact position and the corresponding curve segment of the d-th position on both sides of the contact are weightedly accumulated. The larger the accumulation is, the larger the relative distance is, the larger the local characteristics of arc burn are, and the larger the dynamic characteristics are; the greater the consistency of current path degradation is, the more likely there is arc fluctuation, and the greater the difference in current dynamic response is.
[0101] Step S4: Obtain the arc burn degree of each curve segment according to the current dynamic response difference of each curve segment at the contact position and the arc burn fluctuation degree.
[0102] After the arc burn, the current fluctuation at the contact position shows the characteristics of instantaneous mutation and unstable recovery. Since the opening and closing process will definitely lead to the generation of arcs, the current fluctuation phenomenon will occur multiple times. If there is an arc burn at the contact position, the series of current fluctuation processes and linkage reactions caused will be different from the current changes when the contact is not burned. The burn condition is evaluated by the difference in current dynamic response and arc burn characteristics. The arc burn degree of each curve segment is obtained based on the difference in current dynamic response of each curve segment at the contact position and the degree of arc burn fluctuation.
[0103] Preferably, in one embodiment of the present invention, the method for obtaining the arc burn degree includes:
[0104] The product of the current dynamic response difference of each curve segment at the contact position and the arc burn fluctuation degree is obtained as the arc breakdown probability;
[0105] The difference in arc breakdown probability between each curve segment and other curve segments at the contact position is obtained as the arc burn degree of each curve segment.
[0106] In one embodiment of the present invention, the formula for the arc burn degree is expressed as:
[0107]
[0108] H i =P i ×F i ;
[0109] Among them, S i represents the arc burn degree of the i-th curve segment at the contact position; N represents the number of curve segments on the fitting curve at the contact position; H i represents the arc breakdown probability of the i-th curve segment at the contact position; H j represents the arc breakdown probability of the jth curve segment at the contact position; P i represents the difference in the current dynamic response of the i-th curve segment at the contact position; F iIndicates the arc burn fluctuation degree of the i-th curve segment at the contact position;
[0110] In the formula for arc burn degree, P i ×F i It represents the product of the current dynamic response difference and the arc burn fluctuation degree of the i-th curve segment at the contact position as the arc breakdown probability. The greater the arc breakdown probability, the greater the current dynamic response difference and the arc burn fluctuation degree, and the more likely arc burns are to occur. It represents the mean difference in arc breakdown probability between the i-th curve segment and other curve segments at the contact position, that is, the arc burn degree. The greater the difference in arc breakdown probability between curve segments, the more likely arc burns will occur and the greater the arc burn degree.
[0111] Step S5: Perform fault diagnosis on the gravity disconnector according to the arc burn degree.
[0112] The degree of arc burn can reflect the operating status of the gravity isolating switch. The greater the degree of arc burn, the more likely the gravity isolating switch is to have a fault. Analyzing the degree of arc burn can help to promptly deal with problems with the gravity isolating switch.
[0113] It should be noted that in another embodiment of the present invention, after obtaining the arc burn degree of each curve segment of the contact position, the gravity disconnector is diagnosed for faults, including: if the arc burn degree of any curve segment of the contact position is greater than the preset burn threshold, it is judged that the gravity disconnector is faulty, which helps to conduct a comprehensive inspection of the opening and closing mechanism and the gravity auxiliary device in a timely manner, ensuring that the equipment can resume normal operation after maintenance and reduce the risk of subsequent failures. Among them, the size of the preset burn threshold can be set according to the specific situation. In one embodiment of the present invention, the preset burn threshold is 0.7.
[0114] In summary, the present invention obtains multiple curve segments of the fitting curve; obtains the arc burn fluctuation degree and oscillation attenuation degree of each curve segment for the distribution of current data on each curve segment; and then obtains the arc burn local characteristics between each curve segment at the contact position and the corresponding curve segments at each position on both sides of the contact; obtains the current path degradation consistency of each curve segment at the contact position; obtains the current dynamic response difference of each curve segment at the contact position in combination with the relative distance between the contact position and the different positions on both sides of the contact; obtains the arc burn degree of each curve segment according to the current dynamic response difference of each curve segment at the contact position and the arc burn fluctuation degree; and performs fault diagnosis on the gravity disconnector. The present invention improves the accuracy of fault diagnosis by obtaining the accurate arc burn degree of the contact position.
[0115] Based on the same application concept as the gravity isolating switch fault diagnosis method provided in the embodiment of the present application, the present embodiment also proposes a gravity isolating switch fault diagnosis device, such as Figure 3 As shown, the system includes: a data acquisition module 301, an arc burn fluctuation and attenuation analysis module 302, a dynamic response difference calculation module 303, a burn degree assessment module 304 and a fault diagnosis module 305:
[0116] Data acquisition module 301: acquiring current data of multiple monitoring positions at each moment when the gravity disconnector is closed, wherein the multiple monitoring positions include a contact position and multiple positions on both sides of the contact;
[0117] Arc burn fluctuation and attenuation analysis module 302: constructs a fitting curve of all current data at each monitoring position to obtain multiple curve segments of the fitting curve; obtains the arc burn fluctuation degree and oscillation attenuation of each curve segment according to the distribution of current data on each curve segment;
[0118] Dynamic response difference calculation module 303: according to the oscillation attenuation degree between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact and the arc burn fluctuation degree, obtain the arc burn local characteristics between the corresponding segments; according to the arc burn local characteristics between each curve segment at the contact position and the corresponding curve segments at different positions on both sides of the contact, obtain the current path degradation consistency of each curve segment at the contact position; according to the current path degradation consistency, the relative distance between the contact position and the different positions on both sides of the contact and the arc burn local characteristics, obtain the current dynamic response difference of each curve segment at the contact position;
[0119] Burn degree evaluation module 304: obtains the arc burn degree of each curve segment according to the current dynamic response difference of each curve segment at the contact position and the arc burn fluctuation degree;
[0120] Fault diagnosis module 305: performs fault diagnosis on the gravity disconnector according to the degree of arc burn.
[0121] It should be understood that the gravity isolating switch fault diagnosis device provided in this embodiment is used to execute the above-mentioned gravity isolating switch fault diagnosis method, and therefore has the same beneficial effects as the method adopted, run or implemented by the application program stored therein.
[0122] The present invention also provides a storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the gravity isolating switch fault diagnosis method as described above are implemented.
[0123] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
[0124] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.
Claims
1. A method for diagnosing a gravity isolating switch fault, characterized in that: The method comprises: Acquire current data of multiple monitoring positions at each moment when the gravity disconnector is closed, wherein the multiple monitoring positions include a contact position and multiple positions on both sides of the contact; Construct a fitting curve of all current data at each monitoring position to obtain multiple curve segments of the fitting curve; obtain the arc burn fluctuation degree and oscillation attenuation degree of each curve segment according to the distribution of current data on each curve segment; According to the oscillation attenuation degree between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact and the arc burn fluctuation degree, the arc burn local characteristics between the corresponding segments are obtained; according to the arc burn local characteristics between each curve segment at the contact position and the corresponding curve segments at different positions on both sides of the contact, the current path degradation consistency of each curve segment at the contact position is obtained; according to the current path degradation consistency, the relative distance between the contact position and the different positions on both sides of the contact and the arc burn local characteristics, the current dynamic response difference of each curve segment at the contact position is obtained; According to the difference in the current dynamic response of each curve segment at the contact position and the arc burn fluctuation degree, the arc burn degree of each curve segment is obtained; According to the arc burn degree, fault diagnosis is performed on the gravity disconnector.
2. A gravity isolating switch fault diagnosis method according to claim 1, characterized in that: The method for obtaining the curve segmentation includes: For the contact point position, obtain the maximum and minimum points on the fitting curve; select the range between each maximum point and the adjacent minimum points on both sides to form the corresponding curve segment; The fitting curves of the remaining monitoring positions are divided according to the time range of the curve segments corresponding to the contact positions, so as to obtain a plurality of curve segments corresponding to the remaining monitoring positions.
3. A gravity isolating switch fault diagnosis method according to claim 1, characterized in that: The method for obtaining the arc burn fluctuation degree includes: The difference mean between different adjacent current data on each curve segment is obtained as the first difference; and the ratio between the first difference and the time length of the corresponding curve segment is obtained as the arc burn fluctuation degree.
4. A gravity isolating switch fault diagnosis method according to claim 1, characterized in that: The method for obtaining the oscillation attenuation degree includes: The length of the time range between the time corresponding to the maximum current data and the time corresponding to the last current data in each curve segment is obtained as the fluctuation recovery time; The ratio of the maximum current data and the fluctuation recovery time of each curve segment is obtained, and the product between the ratio result and the variance of the current data within the fluctuation recovery time range is calculated as the oscillation attenuation degree of each curve segment.
5. A gravity isolating switch fault diagnosis method according to claim 1, characterized in that: The method for obtaining the local characteristics of arc burns includes: According to the difference in oscillation attenuation between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact, as well as the difference in arc burn fluctuation degree, the local characteristics of arc burns between the corresponding segments are obtained. The difference in oscillation attenuation is positively correlated with the local characteristics of arc burns, and the difference in arc burn fluctuation degree is negatively correlated with the local characteristics of arc burns.
6. A gravity isolating switch fault diagnosis method according to claim 1, characterized in that: The method for obtaining the current path degradation consistency includes: Obtaining the ratio of the arc burn local characteristics between each curve segment at the contact position and the data segments on the curve segment corresponding to each position on each side of the contact, and the arc burn local characteristics corresponding to the data segment at the latter position, as a first ratio; The difference between each curve segment of the contact position and the corresponding first ratio between the two sides of the contact within the same time range is obtained, and negative correlation mapping is performed as the current path degradation consistency of each curve segment of the contact position.
7. A gravity isolating switch fault diagnosis method according to claim 1, characterized in that: The method for obtaining the current dynamic response difference includes: Obtaining a cumulative sum of the contact position and the relative distances between different positions on both sides of the contact as a first cumulative sum; According to the relative distance between the contact position and different positions on both sides of the contact, weighted accumulation is performed on the arc burn local characteristics between each curve segment of the contact position and the corresponding curve segments at different positions on both sides of the contact as a second accumulated sum; The ratio of the first accumulated value to the second accumulated value is obtained, and the product of the ratio result and the current path degradation consistency of each curve segment at the contact position is calculated as the current dynamic response difference of each curve segment at the contact position.
8. A gravity isolating switch fault diagnosis method according to claim 1, characterized in that: The method for obtaining the arc burn degree includes: The product of the current dynamic response difference of each curve segment at the contact position and the arc burn fluctuation degree is obtained as the arc breakdown probability; The difference in arc breakdown probability between each curve segment and other curve segments at the contact position is obtained as the arc burn degree of each curve segment.
9. A gravity isolating switch fault diagnosis device, characterized in that: Including data acquisition module, arc burn fluctuation and attenuation analysis module, dynamic response difference calculation module, burn degree assessment module, fault diagnosis module: Data acquisition module: acquires current data of multiple monitoring positions at each moment when the gravity disconnector is closed, wherein the multiple monitoring positions include a contact position and multiple positions on both sides of the contact; Arc burn fluctuation and attenuation analysis module: construct a fitting curve of all current data at each monitoring position to obtain multiple curve segments of the fitting curve; obtain the arc burn fluctuation degree and oscillation attenuation of each curve segment according to the distribution of current data on each curve segment; Dynamic response difference calculation module: according to the oscillation attenuation degree between each curve segment at the contact position and the corresponding curve segment at each position on both sides of the contact and the arc burn fluctuation degree, the arc burn local characteristics between the corresponding segments are obtained; according to the arc burn local characteristics between each curve segment at the contact position and the corresponding curve segments at different positions on both sides of the contact, the current path degradation consistency of each curve segment at the contact position is obtained; according to the current path degradation consistency, the relative distance between the contact position and the different positions on both sides of the contact, and the arc burn local characteristics, the current dynamic response difference of each curve segment at the contact position is obtained; Burn degree assessment module: obtain the arc burn degree of each curve segment according to the current dynamic response difference of each curve segment at the contact position and the arc burn fluctuation degree; Fault diagnosis module: performs fault diagnosis on the gravity disconnector according to the arc burn degree.
10. A gravity isolating switch fault diagnosis system, characterized in that: The system stores programs or instructions, and when the programs or instructions are executed by the processor, the steps of a gravity isolating switch fault diagnosis method as claimed in any one of claims 1 to 8 are implemented.