CN113743491B - Monitoring method, monitoring device and monitoring system for closing state of grounding disconnecting link - Google Patents
Monitoring method, monitoring device and monitoring system for closing state of grounding disconnecting link Download PDFInfo
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Abstract
The invention discloses a monitoring method, a monitoring device and a monitoring system for a closing state of a grounding disconnecting link, wherein the method comprises the following steps: acquiring a closing in-place state sample set under a closing in-place state of a test grounding disconnecting link; determining a minimum allowable pressure value in a closing in-place state sample set; calculating a clustering center of a closing in-place state sample set based on a fuzzy C-means clustering algorithm; calculating the relative Euler distance between each sample in the in-place closing state sample set and the clustering center, and determining the maximum Euler distance in the in-place closing state sample set; and determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value. The invention utilizes the characteristic of obvious difference of the pressure of the moving contact and the static contact, and carries out comprehensive judgment and monitoring based on the stroke of the connecting rod of the grounding disconnecting link, thereby improving the accuracy of monitoring the closing state and ensuring the safety of operators.
Description
Technical Field
The invention relates to the technical field of grounding disconnecting switches of power transformation systems, in particular to a monitoring method, a monitoring device and a monitoring system for a closing state of a grounding disconnecting switch.
Background
The reliable closing of the grounding disconnecting link is a safety protection measure for ensuring that the transformer substation and line maintainers prevent external electricity and induced electricity from being damaged. Whether the grounding switch is closed in place or not directly influences the implementation quality of the safety measures and even influences the personal safety of operators.
At present, monitoring of the closing state of the grounding switch of the transformer substation mainly depends on experience observation of operators, for example, the operators observe and judge the closing state of the grounding switch mainly through limit screws, opening and closing indication balls and the like. However, the following problems exist in the observation and judgment of the closing state of the grounding switch by a limit screw, a closing/opening indication ball and the like: 1) An operator observes and judges the closing state of the grounding knife switch through limit screws, a closing and opening indication ball and the like, and is easily influenced by factors such as observation angles, site environments and the like; 2) The stroke deviation of the grounding disconnecting link is smaller, so that the deviation caused by a limit screw, an indication ball and the like is smaller, and the operator is difficult to obviously detect; 3) The limit screw and the indicating ball of the earthing knife-switch are easily mechanically loosened due to the influence of the operation life of the equipment, and the problem of inaccurate indication of the earthing knife-switch closing state is easily caused. The accuracy of monitoring the closing state of the grounding disconnecting link is reduced, and the personal safety of operators is influenced.
Disclosure of Invention
The invention provides a monitoring method, a monitoring device and a monitoring system for a closing state of a grounding switch, which are used for improving the accuracy of monitoring the closing state of the grounding switch and ensuring the personal safety of operators.
In a first aspect, the invention provides a method for monitoring a closing state of a grounding disconnecting link, the grounding disconnecting link comprises a fixed contact and a moving contact arranged at one end of a disconnecting link, the moving contact is driven by the disconnecting link to rotate towards the fixed contact to complete closing, the closing state comprises a state of closing in place and a state of closing in place, and the monitoring method comprises the following steps:
acquiring a closing in-place state sample set under a closing in-place state of a test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link;
determining a minimum allowable pressure value in a closing in-place state sample set;
calculating a clustering center of a closing in-place state sample set based on a fuzzy C-means clustering algorithm;
calculating the relative Euler distance between each sample in the in-place closing state sample set and the clustering center, and determining the maximum Euler distance in the in-place closing state sample set;
and determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value.
Optionally, a pressure sensor is arranged at the moving contact, and a travel sensor is arranged on the disconnecting link; the method for acquiring the in-place closing state sample set of the in-place closing state of the test grounding disconnecting link comprises the following steps:
the pressure value between the fixed contact and the movable contact in the in-place closing state of the test grounding disconnecting link is obtained through the pressure sensor;
the travel sensor is used for acquiring the travel distance of a connecting rod of the disconnecting link in a state that the test grounding disconnecting link is switched on in place;
obtaining a plurality of samples consisting of pressure values between the fixed contact and the movable contact and corresponding connecting rod travel distances to form a closing in-place state sample set;
wherein the switch-on in-place state sample set is S= [ (p) 1 ,s 1 ),(p 2 ,s 2 ),...,(p n ,s n )]The method comprises the steps of carrying out a first treatment on the surface of the n is the number of samples, p i For the pressure value s between the fixed contact and the movable contact in the ith sample i Is the link travel distance in the ith sample.
Optionally, the calculating the relative euler distance between each sample in the switch-on in-place state sample set and the clustering center is determined based on the following formula:
wherein, d i For the ith sample distance from the cluster center (p 0 ,s 0 ) Is a relative euler distance of (2); p is p 0 Is the pressure value s between the fixed contact and the movable contact in the clustering center 0 The travel distance of the connecting rod in the clustering center is; p is p i For the pressure value s between the fixed contact and the movable contact in the ith sample i Is the firstLink travel distance in i samples.
Optionally, the determining the closing state of the grounding switch to be monitored according to the maximum euler distance and the minimum allowable pressure value includes:
acquiring a sample to be monitored, which is formed by a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link after the closing action of the grounding disconnecting link to be monitored;
calculating the relative Euler distance between the sample to be monitored and the clustering center;
and determining the closing state of the grounding disconnecting link to be monitored according to the pressure value between the fixed contact and the moving contact of the grounding disconnecting link to be monitored, the minimum allowable pressure value, and the relative Euler distance between the sample to be monitored and the clustering center and the maximum Euler distance.
Optionally, the determining the closing state of the grounding switch to be monitored according to the pressure value between the fixed contact and the moving contact of the grounding switch to be monitored and the minimum allowable pressure value, and the relative euler distance between the sample to be monitored and the clustering center and the maximum euler distance includes:
judging whether the pressure value between the fixed contact and the movable contact of the grounding switch to be monitored is larger than the minimum allowable pressure value;
if the pressure value between the fixed contact and the movable contact of the grounding disconnecting link to be monitored is smaller than the minimum allowable pressure value, determining that the closing state of the grounding disconnecting link is not in place;
if the pressure value between the fixed contact and the movable contact of the grounding disconnecting link to be monitored is larger than or equal to the minimum allowable pressure value, continuously judging whether the relative Euclidean distance between the sample to be monitored and the clustering center is smaller than or equal to the maximum Euclidean distance;
if the relative Euler distance between the sample to be monitored and the clustering center is smaller than or equal to the maximum Euler distance, determining that the closing state of the grounding disconnecting link is in place;
if the relative Euler distance between the sample to be monitored and the clustering center is larger than the maximum Euler distance, determining that the closing stroke of the grounding disconnecting link is unqualified, and further carrying out hand-shake correction through a manual handle.
Optionally, after determining that the closing stroke of the grounding switch is unqualified, the method further includes:
and determining the correction direction of the closing of the grounding disconnecting link according to the travel distance of the connecting rod of the grounding disconnecting link to be monitored and the travel distance of the connecting rod in the center of the cluster.
Optionally, the determining the correction direction of the closing of the grounding switch according to the travel distance of the connecting rod of the grounding switch to be monitored and the travel distance of the connecting rod in the center of the cluster includes:
judging whether the travel distance of the connecting rod of the grounding disconnecting link to be monitored is smaller than the travel distance of the connecting rod in the clustering center;
if the travel distance of the connecting rod of the grounding disconnecting link to be monitored is smaller than the travel distance of the connecting rod in the clustering center, determining the undertravel of the disconnecting link of the grounding disconnecting link to be monitored, and taking the closing direction of the grounding disconnecting link to be monitored as the correction direction;
otherwise, determining the over-stroke of the disconnecting link of the grounding disconnecting link to be monitored, and taking the direction of disconnecting the grounding disconnecting link to be monitored as the correction direction.
In a second aspect, the present invention provides a device for monitoring a closing state of a grounding switch, for executing the method for monitoring a closing state of a grounding switch according to any of the first aspect, where the monitoring device includes:
the acquisition unit is used for acquiring a closing in-place state sample set in a closing in-place state of the test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link;
the minimum allowable pressure value determining unit is used for determining a minimum allowable pressure value in the in-place closing state sample set;
the clustering center calculating unit is used for calculating a clustering center of the in-place closing state sample set based on a fuzzy C-means clustering algorithm;
the Euler distance calculation unit is used for calculating the relative Euler distance between each sample in the in-place closing state sample set and the clustering center, and determining the maximum Euler distance in the in-place closing state sample set;
and the closing state determining unit is used for determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value.
In a third aspect, the invention provides a monitoring system for a closing state of a grounding switch, which comprises a pressure sensor, a travel sensor and a monitoring device for the closing state of the grounding switch in the second aspect; the pressure sensor is arranged at the moving contact of the grounding disconnecting link, and the travel sensor is arranged on the disconnecting link connecting rod.
Optionally, the pressure sensor includes a first communication unit, and the travel sensor includes a second communication unit; the pressure sensor is used for sending a pressure value between a fixed contact and a movable contact of the grounding disconnecting link to a monitoring device of the closing state of the grounding disconnecting link through a first communication unit; the travel sensor is used for sending the travel distance of the connecting rod of the disconnecting link on the grounding disconnecting link to the monitoring device of the closing state of the grounding disconnecting link through the second communication unit.
The invention provides a monitoring method, a monitoring device and a monitoring system for a closing state of a grounding disconnecting link, wherein the grounding disconnecting link comprises a fixed contact and a moving contact arranged at one end of a disconnecting link, and the moving contact is driven by the disconnecting link to rotate towards the fixed contact to finish closing; the method comprises the following steps: acquiring a closing in-place state sample set under a closing in-place state of a test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link; determining a minimum allowable pressure value in a closing in-place state sample set; calculating a clustering center of a closing in-place state sample set based on a fuzzy C-means clustering algorithm; calculating the relative Euler distance between each sample in the in-place closing state sample set and the clustering center, and determining the maximum Euler distance in the in-place closing state sample set; and determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value. The technical scheme provided by the embodiment of the invention utilizes the characteristic that whether the grounding disconnecting link is closed in place directly shows the significant difference of the pressures of the moving contact and the static contact, and carries out comprehensive judgment and monitoring based on the travel of the connecting rod of the grounding disconnecting link, so that the problems that the grounding disconnecting link is not closed in place, the closing travel is unqualified and the like are timely found, the accuracy of monitoring the closing state of the grounding disconnecting link is improved, and the personal safety of operators is ensured.
Drawings
FIG. 1 is a schematic view of a prior art earthing knife-switch;
fig. 2 is a flowchart of a method for monitoring a closing state of a grounding switch according to an embodiment of the present invention;
FIG. 3 is a flowchart of another method for monitoring a closing state of a grounding switch according to an embodiment of the present invention;
fig. 4 is a block diagram of a device for monitoring a closing state of a grounding switch according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
As in the background art, reliable closing of the grounding disconnecting link is a precondition for ensuring that the transformer substation and line maintainers prevent damage from external electricity and induced electricity. Whether the grounding disconnecting link is closed in place directly influences the implementation quality of the safety measures, and even influences the personal safety of operators. Exemplary, fig. 1 is a schematic structural diagram of a grounding switch provided in the prior art, and referring to fig. 1, the grounding switch includes: a base 1, wherein one end of the base 1 is provided with an insulator 2, and the other end of the base 1 is provided with a conductor 3; the insulator 2 is connected with the fixed contact 4, and rotatable be connected with switch connecting rod 6 on the conductor 3, and the one end of switch connecting rod 6 is provided with moving contact 5, and moving contact 5 rotates to the fixed contact 4 direction under the drive of switch connecting rod 6, reaches the closing position in order to accomplish the closing. The fixed contact 4 is connected to the live line through a connecting pressure plate 41, and the movable contact 5 is connected to the grounding device of the metal conductor 3 through a connecting wire 7 (which may be a flexible connection copper wire) (which increases the current carrying capacity of the grounding current). When the line is running live, the operator pulls the knife switch link 6 away through the pull ring 61 and is about 90 degrees perpendicular to the knife switch base. When the line is subjected to power failure maintenance, the movable contact 5 rotates towards the direction of the fixed contact 4 under the drive of the disconnecting link 6 so as to finish closing, the safety of maintenance personnel of the power failure line is ensured, and the above operations are all operated by using a special operating rod with an electricity testing function.
At present, monitoring of the closing state of the grounding switch of the transformer substation mainly depends on experience observation of operators, for example, the operators observe and judge the closing state of the grounding switch mainly through limit screws, opening and closing indication balls and the like. However, the following problems exist in the observation and judgment of the closing state of the grounding switch by a limit screw, a closing/opening indication ball and the like: 1) An operator observes and judges the closing state of the grounding knife switch through limit screws, a closing and opening indication ball and the like, and is easily influenced by factors such as observation angles, site environments and the like; 2) The stroke deviation of the grounding disconnecting link is smaller, so that the deviation caused by a limit screw, an indication ball and the like is smaller, and the operator is difficult to obviously detect; 3) The limit screw and the indicating ball of the earthing knife-switch are easily mechanically loosened due to the influence of the operation life of the equipment, and the problem of inaccurate indication of the earthing knife-switch closing state is easily caused. The accuracy of monitoring the closing state of the grounding disconnecting link is reduced, and the personal safety of operators is influenced.
In view of this, the present invention provides a method for monitoring a closing state of a grounding switch, and fig. 2 is a flowchart of a method for monitoring a closing state of a grounding switch provided in an embodiment of the present invention, and referring to fig. 2, the method includes:
s110, acquiring a closing in-place state sample set under a closing in-place state of a test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link.
Specifically, the closing state comprises a state of closing in place and a state of not closing in place, the test grounding disconnecting link is subjected to closing operation for a plurality of times, each time the closing reaches the state of closing in place, and the state of closing in place can be judged by measuring the grounding resistance of the grounding disconnecting link. And after the test grounding disconnecting link is switched on each time, collecting the pressure value between the fixed contact and the moving contact and the travel distance of the connecting rod corresponding to the disconnecting link connecting rod. The travel distance of the connecting rod corresponding to the disconnecting link can be understood as the length of the moving track of the disconnecting link from the position of the disconnecting link when the test grounding disconnecting link is in the disconnection state to the position of the disconnecting link when the test grounding disconnecting link is in the closing in-place state. The initial point positions of the knife switch connecting rods are the same when the test grounding knife switch is switched on every time. And acquiring pressure values between the fixed contact and the movable contact for a plurality of times and the travel distance of the connecting rod of the corresponding disconnecting link, thereby forming a closing in-place state sample set under the closing in-place state of the test grounding disconnecting link. That is, each sample in the switch-on in-place state sample set includes a pressure value between the fixed contact and the moving contact, and a link travel distance corresponding to the knife switch link.
Wherein, a pressure sensor can be arranged at the moving contact, and a travel sensor is arranged on the disconnecting link; the pressure value between the fixed contact and the movable contact in the in-place closing state of the test grounding disconnecting link is obtained through a pressure sensor; the travel sensor is used for acquiring the travel distance of a connecting rod of the disconnecting link in a state that the test grounding disconnecting link is switched on in place; and acquiring a plurality of samples consisting of pressure values between the fixed contact and the movable contact and corresponding travel distances of the connecting rods, thereby forming a closing in-place state sample set. Wherein the switch-on in-place state sample set is expressed as s= [ (p) 1 ,s 1 ),(p 2 ,s 2 ),...,(p n ,s n )]The method comprises the steps of carrying out a first treatment on the surface of the n is the number of samples, p i For the pressure value s between the fixed contact and the movable contact in the ith sample i Is the link travel distance in the ith sample.
S120, determining a minimum allowable pressure value in the in-place closing state sample set.
Specifically, the minimum allowable pressure value in the in-place closing state sample set may be understood as the minimum pressure value in the acquired in-place closing state sample set, i.e., the minimum allowable pressure value p min ＝(p 1 ，p 2 ，…，p n )。
S130, calculating a clustering center of the in-place closing state sample set based on a fuzzy C-means clustering algorithm.
Specifically, cluster analysis is one of multivariate statistical analysis and is also an important branch of unsupervised pattern recognition. It divides a sample without class labels into subsets according to some criteria, so that similar samples are assigned to one class as much as possible, while dissimilar samples are assigned to different classes. Hard clustering strictly divides each object to be identified into a certain class, and has the property of the object to be identified, while fuzzy clustering establishes uncertain description of the class by a sample, can more objectively reflect the objective world, and becomes the main stream of cluster analysis. The fuzzy C-means clustering algorithm is widely applied to a plurality of fuzzy clustering algorithms, and can well reflect the value of the fuzzy C-means clustering algorithm in the fields of large-scale data analysis, data mining, vector quantization, image segmentation, pattern recognition and the like. The membership of each sample point to all class centers is obtained by optimizing an objective function, so that the class of the sample point is determined, and the aim of automatically classifying sample data is fulfilled. The clustering parameters are set as follows: the cluster samples are S, S= [ (p) 1 ,s 1 ),(p 2 ,s 2 ),...,(p n ,s n )]The number of clusters is 1. The number of the cluster centers in the determined closing in-place state sample set is 1.
And S140, calculating the relative Euler distance of each sample in the in-place closing state sample set from the clustering center, and determining the maximum Euler distance in the in-place closing state sample set.
Specifically, calculating the relative euler distance of each sample in the closed in-place state sample set from the cluster center is determined based on the following formula:
wherein, (p) 0 ,s 0 ) A cluster center calculated for S130; p is p 0 Is the pressure value s between the fixed contact and the movable contact in the clustering center 0 The travel distance of the connecting rod in the clustering center is; d, d i For the ith sample distance from the cluster center (p 0 ,s 0 ) Is a relative euler distance of (2); p is p i For the pressure value s between the fixed contact and the movable contact in the ith sample i Is the link travel distance in the ith sample. After the relative Euler distance between each sample and the clustering center is calculated, the maximum relative Euler distance d is determined max The calculation formula is d max ＝max(d 1 ,d 2 ,...,d n )。
And S150, determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value.
Specifically, after a closing in-place state sample set of the test grounding disconnecting link in-place state is obtained, a minimum allowable pressure value and a maximum Euler distance are determined according to the closing in-place state sample set. And determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value. The characteristics that whether the grounding disconnecting link is in place or not is directly expressed as the significant difference of the pressures of the moving contact and the static contact are utilized, comprehensive judgment and monitoring are carried out based on the strokes of the connecting rods of the grounding disconnecting link, the problems of false closing of the grounding disconnecting link, insufficient closing stroke depth and the like are timely found, the accuracy of monitoring the closing state of the grounding disconnecting link is improved, and the personal safety of operators is ensured. It should be noted that the test grounding switch and the grounding switch to be monitored are the same type grounding switch.
The embodiment of the invention provides a method for monitoring the closing state of a grounding switch, which comprises the following steps: acquiring a closing in-place state sample set under a closing in-place state of a test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link; determining a minimum allowable pressure value in a closing in-place state sample set; calculating a clustering center of a closing in-place state sample set based on a fuzzy C-means clustering algorithm; calculating the relative Euler distance between each sample in the in-place closing state sample set and the clustering center, and determining the maximum Euler distance in the in-place closing state sample set; and determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value. The technical scheme provided by the embodiment of the invention utilizes the characteristic that whether the grounding disconnecting link is closed in place or not is directly expressed as the significant difference of the pressures of the moving contact and the static contact, and comprehensively judges and monitors based on the stroke of the connecting rod of the grounding disconnecting link, so that the problems of false closing of the grounding disconnecting link, insufficient closing stroke depth and the like are timely found, and the operation quality of the grounding disconnecting link is greatly improved. The method can overcome the defect that the traditional method indirectly observes the closing state of the grounding switch by means of the limit screw, the indication ball and the like, and has the advantages of being less influenced by the field environment and the equipment state, being convenient for online real-time monitoring application and the like. The risk of power grid operation, equipment safety and personal casualties caused by the fact that the grounding disconnecting link is not closed in place can be effectively reduced, the implementation quality of grounding safety protection measures of operators is improved, and the personal safety of operators is guaranteed.
FIG. 3 is a flowchart of another method for monitoring a closing state of a grounding switch according to an embodiment of the present invention; referring to fig. 3, the monitoring method includes:
s210, acquiring a closing in-place state sample set under a closing in-place state of a test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link.
S220, determining a minimum allowable pressure value in the in-place closing state sample set.
S230, calculating a clustering center of the in-place closing state sample set based on a fuzzy C-means clustering algorithm.
S240, calculating the relative Euler distance between each sample in the in-place closing state sample set and the clustering center, and determining the maximum Euler distance in the in-place closing state sample set.
S250, acquiring a sample to be monitored, which is formed by a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link after the closing action of the grounding disconnecting link to be monitored.
Specifically, a pressure sensor is arranged at a moving contact of a grounding disconnecting link to be monitored, and a travel sensor is arranged on a disconnecting link connecting rod; the pressure value between the fixed contact and the movable contact in the in-place closing state of the grounding disconnecting link to be monitored is obtained through a pressure sensor; and the travel distance of the connecting rod of the disconnecting link in the state that the grounding disconnecting link to be monitored is switched in place is obtained through the travel sensor. Because the static contact is connected with the live line through the connecting pressing plate, if the pressure sensor is arranged on the static contact, the pressure sensor can bear high current of normal operation, and the pressure sensor is a sensitive device, so that the detected pressure value is inaccurate and the like. The movable contact is connected with the grounding device through a connecting wire, so that the accuracy of the obtained pressure value between the fixed contact and the movable contact can be ensured by arranging the pressure sensor at the movable contact relative to arranging the pressure sensor at the fixed contact.
And S260, calculating the relative Euler distance of the sample to be monitored from the clustering center.
Specifically, the calculation of the relative euler distance of the sample to be monitored from the clustering center is calculated based on the following formula:
wherein d s For the sample to be monitored, from the cluster center (p 0 ,s 0 ) Is a relative euler distance of (2); p is p s For the pressure value s between the fixed contact and the movable contact in the sample to be monitored s The travel distance of the connecting rod in the sample to be monitored is; p is p 0 Is the pressure value s between the fixed contact and the movable contact in the clustering center 0 Is the travel distance of the connecting rod in the clustering center.
And S270, determining the closing state of the grounding disconnecting link to be monitored according to the pressure value and the minimum allowable pressure value between the fixed contact and the movable contact of the grounding disconnecting link to be monitored, and the relative Euclidean distance and the maximum Euclidean distance between the sample to be monitored and the clustering center.
Specifically, determining the closing state of the grounding switch to be monitored according to the pressure value and the minimum allowable pressure value between the fixed contact and the moving contact of the grounding switch to be monitored, and the relative euler distance and the maximum euler distance of the sample to be monitored from the clustering center may include: judging whether the pressure value between the fixed contact and the movable contact of the grounding disconnecting link to be monitored is larger than or equal to the minimum allowable pressure value; if the pressure value between the fixed contact and the movable contact of the grounding disconnecting link to be monitored is smaller than the minimum allowable pressure value, determining that the closing state of the grounding disconnecting link is not in place; if the pressure value between the fixed contact and the movable contact of the grounding disconnecting link to be monitored is larger than or equal to the minimum allowable pressure value, continuously judging whether the relative Euclidean distance between the sample to be monitored and the clustering center is smaller than or equal to the maximum Euclidean distance; if the relative Euler distance between the sample to be monitored and the clustering center is smaller than or equal to the maximum Euler distance, determining that the closing state of the grounding disconnecting link is in place; if the relative Euler distance between the sample to be monitored and the clustering center is larger than the maximum Euler distance, determining that the closing stroke of the grounding disconnecting link is unqualified, and further carrying out hand-operated correction through a manual handle.
In summary, the closing state of the grounding switch is judged according to the closing state criterion of the grounding switch, and the closing state criterion comprises:
(1) If p s <p min Judging that the closing state of the grounding disconnecting link is not in place;
(2) If p s ≥p min And d s ≤d max Judging that the closing state of the grounding disconnecting link is in place;
(3) If p s ≥p min And d s ＞d max And judging that the closing stroke of the grounding disconnecting link is unqualified, and further carrying out hand correction by a manual handle.
Optionally, after determining that the closing stroke of the grounding switch is unqualified, the method further includes:
and determining the correction direction of the closing of the grounding disconnecting link according to the travel distance of the connecting rod of the grounding disconnecting link to be monitored and the travel distance of the connecting rod in the center of the cluster.
Specifically, determining the correction direction of the closing of the grounding switch according to the travel distance of the connecting rod of the grounding switch to be monitored and the travel distance of the connecting rod in the center of the cluster may include: judging whether the travel distance of the connecting rod of the grounding disconnecting link to be monitored is smaller than the travel distance of the connecting rod in the clustering center; if the travel distance of the connecting rod of the grounding disconnecting link to be monitored is smaller than the travel distance of the connecting rod in the center of the cluster, determining the undertravel of the disconnecting link of the grounding disconnecting link to be monitored, and taking the closing direction of the grounding disconnecting link to be monitored as the correction direction; otherwise, determining the over-travel of the disconnecting link of the grounding disconnecting link to be monitored, and taking the direction of disconnecting the grounding disconnecting link to be monitored as the correction direction.
To sum up, when p s ≥p min And d s ＞d max Judging that the closing stroke of the grounding disconnecting link is unqualified, and further carrying out hand-operated correction through a manual closing handle, wherein the correction method comprises the following steps:
(1) If s s <s 0 Correcting the direction of closing the grounding disconnecting link by a manual handle;
(2) If s s ≥s 0 The direction of the ground knife switch is corrected by the manual handle.
According to the method for monitoring the closing state of the grounding disconnecting link, provided by the embodiment of the invention, the characteristics that whether the grounding disconnecting link is closed in place or not is directly expressed as the significant difference of the pressures of the moving contact and the static contact are utilized, comprehensive judgment and monitoring are carried out based on the stroke of the connecting rod of the grounding disconnecting link, the problems of false closing of the grounding disconnecting link, insufficient closing stroke depth and the like are timely found, and the operation quality of the grounding disconnecting link is greatly improved. The method can overcome the defect that the traditional method indirectly observes the closing state of the grounding switch by means of the limit screw, the indication ball and the like, and has the advantages of being less influenced by the field environment and the equipment state, being convenient for online real-time monitoring application and the like. The monitoring method can effectively avoid risks of power grid operation, equipment safety and personal injury and death caused by insufficient closing of the grounding disconnecting link, improve the implementation quality of grounding safety protection measures of operators, and ensure the personal safety of operators. In addition, the correction direction of the closing of the grounding switch is determined according to the travel distance of the connecting rod of the grounding switch to be monitored and the travel distance of the connecting rod in the center of the cluster. The sensor has a communication function, the pressure value of the closing of the grounding disconnecting link is transmitted to the monitoring terminal, and the monitoring terminal analyzes the data and outputs a monitoring result.
The embodiment of the invention also provides a device for monitoring the closing state of the grounding switch, which is used for executing the method for monitoring the closing state of the grounding switch according to any embodiment, and fig. 4 is a block diagram of a device for monitoring the closing state of the grounding switch, provided by the embodiment of the invention, referring to fig. 4, the device comprises:
the acquisition unit is used for acquiring a closing in-place state sample set in a closing in-place state of the test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link;
the minimum allowable pressure value determining unit is used for determining a minimum allowable pressure value in the in-place closing state sample set;
the clustering center calculating unit is used for calculating a clustering center of the in-place closing state sample set based on a fuzzy C-means clustering algorithm;
the Euler distance calculation unit is used for calculating the relative Euler distance of each sample in the in-place closing state sample set from the clustering center and determining the maximum Euler distance in the in-place closing state sample set;
and the closing state determining unit is used for determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value.
Specifically, the monitoring device for the closing state of the grounding disconnecting link comprises an acquisition unit, a minimum allowable pressure value determining unit, a clustering center calculating unit, an Euler distance calculating unit and a closing state determining unit. The acquisition unit is used for acquiring a closing in-place state sample set in a closing in-place state of the test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link. A pressure sensor can be arranged at the moving contact, and a travel sensor is arranged on the disconnecting link; acquiring a pressure value between a fixed contact and a movable contact in a test grounding disconnecting link in-place closing state detected by a pressure sensor; and acquires travel sensingAnd detecting the travel distance of the connecting rod of the disconnecting link in the in-place state of the test grounding disconnecting link. And the samples are composed of pressure values between the fixed contact and the movable contact and corresponding connecting rod travel distances, so that a closing in-place state sample set is formed. Wherein the sample set is s= [ (p) 1 ,s 1 ),(p 2 ,s 2 ),...,(p n ,s n )]The method comprises the steps of carrying out a first treatment on the surface of the n is the number of samples, p i For the pressure value s between the fixed contact and the movable contact in the ith sample i Is the link travel distance in the ith sample.
The minimum allowable pressure value determining unit is used for determining a minimum allowable pressure value in the in-place closing state sample set. The minimum allowable pressure value in the in-place closing state sample set may be understood as the minimum pressure value in the acquired in-place closing state sample set. The clustering center calculating unit is used for calculating the clustering center of the in-place closing state sample set based on the fuzzy C-means clustering algorithm. The Euler distance calculation unit is used for calculating the relative Euler distance between each sample in the in-place closing state sample set and the clustering center, and determining the maximum Euler distance in the in-place closing state sample set. Calculating the relative Euler distance between the sample and the clustering center in the in-place closing state sample set is determined based on the following formula:
wherein d i For the ith sample distance from the cluster center (p 0 ,s 0 ) Is a relative euler distance of (2); p is p i For the pressure value s between the fixed contact and the movable contact in the ith sample i The travel distance of the connecting rod in the ith sample; p is p 0 Is the pressure value s between the fixed contact and the movable contact in the clustering center 0 Is the travel distance of the connecting rod in the clustering center. After the relative Euler distance between each sample and the clustering center is calculated, the maximum relative Euler distance d is determined max The calculation formula is d max ＝max(d 1 ,d 2 ,...,d n )。
And determining a minimum allowable pressure value and a maximum Euler distance according to the in-place closing state sample set. And the closing state determining unit is used for determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value. The characteristics that whether the grounding disconnecting link is in place or not is directly expressed as the significant difference of the pressures of the moving contact and the static contact are utilized, comprehensive judgment and monitoring are carried out based on the strokes of the connecting rods of the grounding disconnecting link, the problems of false closing of the grounding disconnecting link, insufficient closing stroke depth and the like are timely found, the accuracy of monitoring the closing state of the grounding disconnecting link is improved, and the personal safety of operators is ensured.
The embodiment of the invention also provides a monitoring system for the closing state of the grounding switch, which comprises a pressure sensor, a travel sensor and the monitoring device for the closing state of the grounding switch, wherein the monitoring device is used for monitoring the closing state of the grounding switch; the pressure sensor is arranged at the moving contact of the grounding disconnecting link, and the stroke sensor is arranged on the disconnecting link connecting rod.
The pressure sensor comprises a first communication unit, and the travel sensor comprises a second communication unit; the pressure sensor is used for sending a pressure value between a fixed contact and a movable contact of the grounding disconnecting link to a monitoring device in a closing state of the grounding disconnecting link through the first communication unit; the travel sensor is used for sending the link travel distance of the disconnecting link on the grounding disconnecting link to the monitoring device of the closing state of the grounding disconnecting link through the second communication unit. The monitoring device is used for judging whether the grounding disconnecting link to be monitored is closed in place according to the pressure value between the fixed contact and the moving contact and the travel distance of the connecting rod.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. The method for monitoring the closing state of the grounding disconnecting link is characterized in that the grounding disconnecting link comprises a fixed contact and a moving contact arranged at one end of a disconnecting link connecting rod, the moving contact is driven by the disconnecting link connecting rod to rotate towards the direction of the fixed contact so as to complete closing, the closing state comprises a state of closing in place and a state of closing in place, and the monitoring method comprises the following steps:
acquiring a closing in-place state sample set under a closing in-place state of a test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link;
determining a minimum allowable pressure value in a closing in-place state sample set;
calculating a clustering center of a closing in-place state sample set based on a fuzzy C-means clustering algorithm;
calculating the relative Euler distance between each sample in the in-place closing state sample set and the clustering center, and determining the maximum Euler distance in the in-place closing state sample set;
determining a closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value;
the relative Euler distance between each sample in the calculated closing in-place state sample set and the clustering center is determined based on the following formula:
wherein d i For the ith sample distance from the cluster center (p 0 ,s 0 ) Is a relative euler distance of (2); p is p 0 Is the pressure value s between the fixed contact and the movable contact in the clustering center 0 The travel distance of the connecting rod in the clustering center is; p is p i For the pressure value s between the fixed contact and the movable contact in the ith sample i The travel distance of the connecting rod in the ith sample;
the determining the closing state of the grounding disconnecting link to be monitored according to the maximum euler distance and the minimum allowable pressure value comprises the following steps:
acquiring a sample to be monitored, which is formed by a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link after the closing action of the grounding disconnecting link to be monitored;
calculating the relative Euler distance between the sample to be monitored and the clustering center;
and determining the closing state of the grounding disconnecting link to be monitored according to the pressure value between the fixed contact and the moving contact of the grounding disconnecting link to be monitored, the minimum allowable pressure value, and the relative Euler distance between the sample to be monitored and the clustering center and the maximum Euler distance.
2. The method for monitoring the closing state of a grounding switch according to claim 1, wherein a pressure sensor is arranged at the moving contact, and a travel sensor is arranged on the switch connecting rod; the method for acquiring the in-place closing state sample set of the in-place closing state of the test grounding disconnecting link comprises the following steps:
the pressure value between the fixed contact and the movable contact in the in-place closing state of the test grounding disconnecting link is obtained through the pressure sensor;
the travel sensor is used for acquiring the travel distance of a connecting rod of the disconnecting link in a state that the test grounding disconnecting link is switched on in place;
obtaining a plurality of samples consisting of pressure values between the fixed contact and the movable contact and corresponding connecting rod travel distances to form a closing in-place state sample set;
wherein the switch-on in-place state sample set is expressed as s= [ (p) 1 ,s 1 ),(p 2 ,s 2 ),...,(p n ,s n )]The method comprises the steps of carrying out a first treatment on the surface of the n is the number of samples, p i For the pressure value s between the fixed contact and the movable contact in the ith sample i Is the link travel distance in the ith sample.
3. The method for monitoring a closing state of a grounding switch according to claim 1, wherein determining the closing state of the grounding switch to be monitored according to the pressure value between the fixed contact and the movable contact of the grounding switch to be monitored and the minimum allowable pressure value, and the relative euler distance between the sample to be monitored and the cluster center and the maximum euler distance includes:
judging whether the pressure value between the fixed contact and the movable contact of the grounding switch to be monitored is larger than the minimum allowable pressure value;
if the pressure value between the fixed contact and the movable contact of the grounding disconnecting link to be monitored is smaller than the minimum allowable pressure value, determining that the closing state of the grounding disconnecting link is not in place;
if the pressure value between the fixed contact and the movable contact of the grounding disconnecting link to be monitored is larger than or equal to the minimum allowable pressure value, continuously judging whether the relative Euler distance between the sample to be monitored and the clustering center is smaller than or equal to the maximum Euler distance;
if the relative Euler distance between the sample to be monitored and the clustering center is smaller than or equal to the maximum Euler distance, determining that the closing state of the grounding disconnecting link is in place;
if the relative Euler distance between the sample to be monitored and the clustering center is larger than the maximum Euler distance, determining that the closing stroke of the grounding disconnecting link is unqualified, and further carrying out hand-shake correction through a manual handle.
4. The method for monitoring a closing state of a grounding switch according to claim 3, further comprising, after determining that a closing stroke of the grounding switch is not acceptable:
and determining the correction direction of the closing of the grounding disconnecting link according to the travel distance of the connecting rod of the grounding disconnecting link to be monitored and the travel distance of the connecting rod in the center of the cluster.
5. The method for monitoring a closing state of a grounding switch according to claim 4, wherein determining a correction direction of the closing of the grounding switch according to a link travel distance of the grounding switch to be monitored and a link travel distance in a cluster center comprises:
judging whether the travel distance of the connecting rod of the grounding disconnecting link to be monitored is smaller than the travel distance of the connecting rod in the clustering center;
if the travel distance of the connecting rod of the grounding disconnecting link to be monitored is smaller than the travel distance of the connecting rod in the clustering center, determining the undertravel of the disconnecting link of the grounding disconnecting link to be monitored, and taking the closing direction of the grounding disconnecting link to be monitored as the correction direction;
otherwise, determining the over-stroke of the disconnecting link of the grounding disconnecting link to be monitored, and taking the direction of disconnecting the grounding disconnecting link to be monitored as the correction direction.
6. A device for monitoring a closing state of a grounding switch, which is used for executing the method for monitoring a closing state of a grounding switch according to any one of claims 1 to 5, and comprises the following steps:
the acquisition unit is used for acquiring a closing in-place state sample set in a closing in-place state of the test grounding disconnecting link; each sample in the switch-on in-place state sample set comprises a pressure value between a fixed contact and a movable contact and a connecting rod travel distance corresponding to a disconnecting link;
the minimum allowable pressure value determining unit is used for determining a minimum allowable pressure value in the in-place closing state sample set;
the clustering center calculating unit is used for calculating a clustering center of the in-place closing state sample set based on a fuzzy C-means clustering algorithm;
the Euler distance calculation unit is used for calculating the relative Euler distance between each sample in the in-place closing state sample set and the clustering center, and determining the maximum Euler distance in the in-place closing state sample set;
and the closing state determining unit is used for determining the closing state of the grounding disconnecting link to be monitored according to the maximum Euler distance and the minimum allowable pressure value.
7. A monitoring system for the closing state of a grounding switch, which is characterized by comprising a pressure sensor, a travel sensor and the monitoring device for the closing state of the grounding switch according to claim 6; the pressure sensor is arranged at the moving contact of the grounding disconnecting link, and the travel sensor is arranged on the disconnecting link connecting rod.
8. The system for monitoring the closing state of a grounding switch according to claim 7, wherein the pressure sensor comprises a first communication unit and the travel sensor comprises a second communication unit; the pressure sensor is used for sending a pressure value between a fixed contact and a movable contact of the grounding disconnecting link to a monitoring device of the closing state of the grounding disconnecting link through a first communication unit; the travel sensor is used for sending the travel distance of the connecting rod of the disconnecting link on the grounding disconnecting link to the monitoring device of the closing state of the grounding disconnecting link through the second communication unit.
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| CN106339722A (en) * | 2016-08-25 | 2017-01-18 | 国网浙江省电力公司杭州供电公司 | Line knife switch state monitoring method and device |
| CN112072695A (en) * | 2020-08-13 | 2020-12-11 | 明阳智慧能源集团股份公司 | Wind power base collecting circuit control method, system, storage medium and computing equipment |
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