CN117452147B - Fault positioning method and positioning system for current collecting line - Google Patents
Fault positioning method and positioning system for current collecting line Download PDFInfo
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- CN117452147B CN117452147B CN202311695692.1A CN202311695692A CN117452147B CN 117452147 B CN117452147 B CN 117452147B CN 202311695692 A CN202311695692 A CN 202311695692A CN 117452147 B CN117452147 B CN 117452147B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Locating Faults (AREA)
Abstract
The invention discloses a fault positioning method and a fault positioning system for a collecting line, wherein the fault positioning method for the collecting line comprises the steps of arranging a plurality of nodes between a box transformer and a booster station of the collecting line, arranging a current detector at each node, detecting high-frequency current pulse amplitude values of all nodes on the collecting line in an initial state through the current detector to serve as initial current values, recording real-time high-frequency current pulse amplitude values of the current detector in a to-be-detected state to serve as measured current values, and positioning fault points of the collecting line according to changes of the measured current values of all the nodes relative to the initial current values. It can be appreciated that the technical scheme of the invention realizes the online fault positioning of the current collecting circuit.
Description
Technical Field
The invention relates to the technical field of line fault detection, in particular to a current collection line fault positioning method and a current collection line fault positioning system.
Background
Most common faults in wind power plants are faults of a collecting circuit, and the circuit of the collecting circuit is easily influenced by factors such as natural environment, operation age and the like to generate faults. Abnormal discharge of the transformer, insulation aging of the cable and insulation damage caused by equipment abnormality can cause line faults of the current collecting line, reduce the reliability of the line, and even cause the breakdown of the whole system when serious. Therefore, the realization of fault detection of the collector line is of great significance. The existing online fault positioning technology of the current collecting line mainly comprises a traveling wave method and an intelligent distance measuring method, wherein the traveling wave head of the traveling wave method is slow in ascending speed, the traveling wave waveform is very complex, the time identification difficulty of the traveling wave head is high, therefore, the precision and reliability of the traveling wave distance measurement are difficult to ensure, and compared with the traveling wave method, the intelligent distance measuring method is high in innovation, but is not mature and perfect in principle and cannot be put into practical application.
Disclosure of Invention
The invention mainly aims to provide a fault positioning method for a collector circuit, which aims to realize on-line fault positioning of the collector circuit.
In order to achieve the above object, the method for positioning the fault of the collecting line provided by the invention comprises the following steps:
a plurality of nodes are arranged between the box transformer of the current collecting line and the booster station;
A current detector is arranged at each node, and the high-frequency current pulse amplitude of each node on the current collecting line in the initial state is detected through the current detector and used as an initial current value;
Recording the real-time high-frequency current pulse amplitude of the current detector in a to-be-detected state as a measured current value;
and positioning a fault point of the collecting line according to the change of the measured current value of each node relative to the initial current value.
Optionally, the step of locating the fault point of the collecting line according to the change of the measured current value of each node relative to the initial current value includes:
according to the current variation between the initial current value and the measured current value of each node, locating the node where the fault is located on the collecting line, and recording the node as a fault node;
And determining the position of the fault point in the fault node range according to the current variation of the nodes before and after the fault node.
Optionally, the step of locating the node where the fault is located on the collecting line according to the current variation between the initial current value and the measured current value of each node includes:
according to the topological structure of the current collecting circuit, establishing the corresponding relation between the position of each node and the current variation quantity of each node;
And determining the position of the node with the largest current variation according to the corresponding relation, namely the node with the fault on the current collecting line.
Optionally, the step of determining the location of the fault point in the fault node range according to the current variation of the nodes before and after the fault node includes:
According to the established corresponding relation, respectively performing linear fitting on nodes between the box transformer and the fault node and nodes between the fault node and the booster station of the collecting line;
And determining an intersection point of the two straight lines of the linear fitting, and positioning the position of the intersection point, namely the fault point of the current collecting line.
Optionally, the step of performing linear fitting on the node between the tank transformer and the fault node of the collecting line and the node between the fault node and the booster station respectively includes:
According to the topological structure of the current collecting circuit, establishing a coordinate system of the distance and the current variation of the box transformer of the current collecting circuit at the position of each node;
corresponding to the positions of the coordinate system where each node is located, linearly fitting the nodes between the box transformer of the collecting line in the coordinate system and the fault node to obtain a first straight line;
And linearly fitting the fault node in the coordinate system with a node between the booster station of the current collecting line to obtain a second straight line.
Optionally, the step of determining an intersection point of the two straight lines of the linear fitting and locating the position of the intersection point includes:
determining an intersection point of the first straight line and the second straight line;
determining the position of the intersection point relative to the previous node of the fault node, namely a first position;
Determining the position of the intersection point relative to the next node of the fault node, namely a second position;
and positioning an intersection point according to the first position and the second position.
Optionally, the step of disposing a plurality of nodes between the tank transformer and the booster station of the collector line includes:
determining the node setting position of the current collecting circuit according to the topological structure and circuit parameters of the current collecting circuit;
and setting nodes between the box transformer of the collecting line and the booster station according to the determined node setting positions.
The invention also provides a fault positioning system of the current collecting line, which comprises:
The current detectors are used for detecting high-frequency current pulse amplitude values in the initial state of each node on the current collecting line as initial current values;
And the terminal is connected with the current detector, records the real-time high-frequency current pulse amplitude of the current detector in a to-be-detected state and is used as a measured current value, and the terminal positions the fault point of the current collecting circuit according to the change of the measured current value of each node relative to the initial current value.
Optionally, the terminal includes a processor and a display, the processor is respectively connected to the current detectors, the processor processes the high-frequency current pulse amplitude detected by the current detectors to obtain a processing result, the display is connected with the processor, and the display displays the processing result of the processor.
Optionally, the terminal further comprises an alarm, wherein the alarm is in communication connection with the processor, and the alarm is used for sending out alarm information according to a processing result of the processor.
When the line of the current collecting line is in fault, the high-frequency current pulse amplitude of the current collecting line can change relative to the initial current value, and the change amplitude of the high-frequency current pulse amplitude can be different along with the distance from the fault point, so that the current detectors are arranged on a plurality of nodes of the current collecting line to detect the change of the current values at different positions, and the fault point on the current collecting line is positioned, namely the technical scheme of the invention realizes the on-line fault positioning of the current collecting line.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph showing initial current value distribution of each node according to an embodiment of the present invention;
FIG. 2 is a graph showing the current variation distribution of each node according to an embodiment of the present invention;
FIG. 3 is a diagram showing the effect of fault point location of a collector line according to an embodiment of the present invention;
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present invention) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
The invention provides a fault positioning method of a collector circuit, which aims to realize online fault positioning of the collector circuit.
In an embodiment of the present invention, a fault locating method for a collecting line includes the steps of:
a plurality of nodes are arranged between the box transformer of the current collecting line and the booster station;
A current detector is arranged at each node, and the high-frequency current pulse amplitude of each node on the current collecting line in the initial state is detected through the current detector and used as an initial current value;
Recording the real-time high-frequency current pulse amplitude of the current detector in a to-be-detected state as a measured current value;
and positioning a fault point of the collecting line according to the change of the measured current value of each node relative to the initial current value.
According to the technical scheme, a plurality of nodes are arranged between a box transformer of a current collecting line and a booster station, a current detector is arranged at each node, a high-frequency current pulse amplitude of each node on the current collecting line in an initial state is detected through the current detector to serve as an initial current value, a real-time high-frequency current pulse amplitude of the current detector in a to-be-detected state is recorded to serve as a measured current value, and fault points of the current collecting line are positioned according to the change of the measured current value of each node relative to the initial current value. When the line of the current collecting line is in fault, the measured current value detected in real time can change relative to the initial current value, and the change amplitude of the high-frequency current pulse amplitude can be different along with the distance from the fault point, so that the current detectors are arranged on a plurality of nodes of the current collecting line to detect the change of the current values at different positions, and the fault point on the current collecting line is positioned, namely, the technical scheme of the invention realizes the online fault positioning of the current collecting line. It can be appreciated that the embodiment of the invention detects high-frequency current pulses through the current detector, and compared with the traveling wave method, the fault location accuracy is higher. In addition, the embodiment of the invention has the advantages of less data to be uploaded, small communication burden, avoiding the pressure of a large amount of wave recording data to the master station and the power consumption of the terminal, and the master station can realize the distance measurement and the positioning of fault points and realize the positioning of faults according to the distribution condition of the multipoint terminals of the collecting lines by combining the topological structure of the collecting lines and the arrangement positions of the nodes on the collecting lines. The method is economical, convenient and simple, does not need to additionally configure a terminal, can directly utilize the existing current collecting line feeder terminal, and has wide application prospect.
In the embodiment of the present invention, as shown in fig. 1, the initial current value may be a high-frequency current pulse detection value of the current detector at the initial time, or may be any other high-frequency current pulse detection value in a normal state to be detected, and any high-frequency current pulse detection value that is not in fault in the line in the normal state to be detected may be used as the initial current value. It is additionally stated that the high frequency current is a current relative to the power frequency 50Hz alternating current, changing the power frequency current to a relatively high frequency current, also known as a high frequency current. In this embodiment, the nodes may be set at equal intervals according to the needs, or may be set according to line parameters, the current detector is used to detect the current of the node, and the current detector may be an ammeter, a current transformer, or a current sensor, which mainly can implement high-frequency current pulse detection of the line node.
In an embodiment of the present invention, the step of locating the fault point of the collecting line according to the change of the measured current value of each node relative to the initial current value includes locating the node where the fault is located on the collecting line according to the current change between the initial current value and the measured current value of each node, and recording the node as the fault node, and determining the location of the fault point within the range of the fault node according to the current change of the nodes before and after the fault node. In the transmission of the high-frequency current from the tank to the booster station, the closer to the fault node, the greater the degree of current decay, that is, the greater the current variation. That is, the current variation amount of the node between the tank of the collector line and the fault node is in an upward trend, and the current variation amount of the node between the fault node and the booster station of the collector line is in a downward trend. Therefore, the current variation of the nodes arranged at different positions is detected, and the position of the node where the fault is located can be obtained according to the magnitude of the current variation, so that the fault node is positioned. As shown in fig. 2, fig. 2 corresponds to three cases of node failure at three positions, namely, a 3# node and a 4# node, so that the failure section is locked by positioning the failure node. Of course, in order to further lock the specific position of the fault point, as shown in fig. 2 (b), the embodiment of the present invention further analyzes the trend of the current variation of the nodes before and after the fault node, and of course, the analysis method may also be mathematical modeling analysis or regression analysis, which is not limited to this, and all the above are within the protection scope of the embodiment of the present invention.
In an embodiment of the present invention, the step of locating the node where the fault is located on the collecting line according to the current variation between the initial current value and the measured current value of each node includes establishing a correspondence between the location of each node and the current variation according to the topology of the collecting line, and determining the location of the node where the current variation is largest as the node where the fault is located on the collecting line according to the correspondence. In the embodiment of the invention, the position of the box transformer of the current collection line is taken as the reference point, and of course, other positions can be taken as the reference point to simplify calculation, so that the position of the node is determined by the distance between the node and the reference point, the corresponding relation between the distance and the current variation as shown in fig. 2 is established, and the position of the node of the current variation is determined according to the corresponding relation, thereby realizing the distance measurement and positioning of the fault node. Of course, the above correspondence relationship may be established in a table, which is not limited to the embodiment of the present invention, and the above is all within the protection scope of the present invention.
In an embodiment of the present invention, the step of determining, according to the current variation of the nodes before and after the fault node, the location of the fault point in the fault node range includes performing linear fitting on the node between the box transformer of the collecting line and the fault node and the node between the fault node and the booster station according to the established correspondence, determining an intersection point of two straight lines of the linear fitting, and locating the location of the intersection point, that is, the fault point of the collecting line. It should be noted that, because the line parameters of the collecting lines are basically consistent, attenuation amplitude is basically consistent, as shown in fig. 2, the fault node in fig. 2 (a) is a 3# node, the fault node in fig. 2 (c) is a 4# node, and the fault node in fig. 2 (b) is not a 3# node, but the 3# node is not a fault point, but among the set nodes, the 3# node is closest to the fault point, which results in the greatest current attenuation and the greatest current variation, so that, in order to further locate the position of the fault point in the fault node range, the embodiment of the invention obtains the position of the fault point by linear fitting to the node between the box transformer of the collecting line and the fault node and the node between the fault node and the booster station in a linear fitting mode, thereby realizing the accurate location of the fault point.
In an embodiment of the invention, the step of performing linear fitting on the nodes between the box transformer and the fault node of the collecting line and the nodes between the fault node and the booster station respectively comprises the steps of establishing a coordinate system of the distance and the current variation of the box transformer of the collecting line relative to the positions of all the nodes according to the topological structure of the collecting line, performing linear fitting on the nodes between the box transformer of the collecting line and the fault node in the coordinate system corresponding to the positions of all the nodes to obtain a first straight line, and performing linear fitting on the nodes between the fault node and the booster station of the collecting line in the coordinate system to obtain a second straight line. It should be noted that, according to the invention, through the topological structure of the collecting circuit, a coordinate system of the position of each node and the corresponding current variation is established, so that the nodes in the coordinate system are linearly fitted, and the corresponding first straight line and the second straight line can be obtained, namely the intersection point of the first straight line and the second straight line is the fault point of the collecting circuit, and then the fault point is measured according to the coordinate system, thereby realizing the accurate positioning of the fault point of the collecting circuit.
In an embodiment of the present invention, the step of determining an intersection point of two straight lines of the linear fitting and locating the position of the intersection point includes determining an intersection point of the first straight line and the second straight line, determining a position of the intersection point relative to a previous node of the fault node, that is, a first position, determining a position of the intersection point relative to a next node of the fault node, that is, a second position, and locating the intersection point according to the first position and the second position. In the embodiment of the invention, as shown in fig. 3, the intersection point of the first straight line and the second straight line is an O point, the O point is a fault point, the distance between the O point and the previous node is L1, and the distance between the O point and the next node is L2, so that the distance measurement of the fault point is realized according to the distance between the O point and the previous node and the first position of L1 and the distance between the O point and the next node is the second position of L2, and the accurate positioning of the fault is realized through the distance measurement of the fault point. It can be understood that the embodiment of the invention realizes the fault distance measurement function of the current collecting circuit, and compared with a traveling wave method, the embodiment of the invention has higher accuracy of acquiring the high-frequency current pulse, higher accuracy of positioning and wider application prospect.
In one embodiment of the invention, the step of setting a plurality of nodes between the box transformer of the collecting circuit and the booster station comprises the steps of determining the node setting position of the collecting circuit according to the topological structure of the collecting circuit and circuit parameters, and setting the nodes between the box transformer of the collecting circuit and the booster station according to the determined node setting position. It should be noted that, in the embodiment of the invention, the node setting position of the collecting circuit is determined according to the topology structure and the circuit parameters of the collecting circuit, and the possible fault area of the circuit is covered by the node setting position, so that the accurate positioning of the faults of the collecting circuit is ensured. Of course, for the area with complicated circuit and easy failure, a proper amount of nodes can be added, and the embodiment of the invention is not limited thereto, and the above is all within the protection scope of the embodiment of the invention.
In one embodiment of the invention, the fault positioning system of the collecting line comprises a plurality of current detectors, a terminal and a measuring terminal, wherein a plurality of nodes are arranged between a box transformer and a booster station of the collecting line, each node is provided with the current detector, the high-frequency current pulse amplitude of each node on the collecting line in an initial state is detected by the current detector to serve as an initial current value, the terminal is connected with the current detector, the real-time high-frequency current pulse amplitude of the current detector in a to-be-detected state is recorded to serve as a measuring current value, and the terminal positions a fault point of the collecting line according to the change of the measuring current value of each node relative to the initial current value. When the line of the collecting line is in fault, the high-frequency current pulse amplitude of the collecting line can change relative to the initial current value, and the change amplitude of the high-frequency current pulse amplitude can be different along with the distance from the fault point, so that the current detectors are arranged on a plurality of nodes of the collecting line to detect the change of the current values at different positions, and the fault point on the collecting line is positioned, namely, the technical scheme of the invention realizes the on-line fault positioning of the collecting line.
In an embodiment of the present invention, the terminal includes a processor and a display, where the processor is connected to the current detector, the processor processes the high-frequency current pulse amplitude detected by the current detector to obtain a processing result, and the display is connected to the processor, and the display displays the processing result of the processor, where the processing result includes high-frequency current pulse amplitude distribution of nodes at different positions on the collector line, and when the processing result is obtained, the display displays the fault point position of the collector line. And the processor is also used for being in communication connection with the alarm so as to send out alarm information through the alarm. The processor is used for establishing a corresponding relation between the position of each node and the current variation according to the topological structure of the collecting line, determining the position of the node with the largest current variation, namely the node with the largest current variation on the collecting line, marking the node as a fault node, establishing a coordinate system of the distance between the position of each node and the box transformer of the collecting line and the current variation according to the established corresponding relation, corresponding to the position of each node, linearly fitting the node between the box transformer of the collecting line and the fault node in the coordinate system to obtain a first straight line, linearly fitting the node between the fault node and the booster station of the collecting line in the coordinate system to obtain a second straight line, determining the intersection point of the first straight line and the second straight line, determining the position of the intersection point relative to the former node of the fault node, namely the first position, determining the position of the latter node of the intersection point relative to the fault node, namely the second position, and positioning the intersection point of the collecting line according to the first position and the second position. It can be understood that the fault point is measured by the coordinate system, so that the accurate positioning of the fault point of the current collecting circuit is realized.
The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).
Claims (8)
1. The fault positioning method for the current collecting line is characterized by comprising the following steps:
a plurality of nodes are arranged between the box transformer of the current collecting line and the booster station;
A current detector is arranged at each node, and the high-frequency current pulse amplitude of each node on the current collecting line in the initial state is detected through the current detector and used as an initial current value;
Recording the real-time high-frequency current pulse amplitude of the current detector in a to-be-detected state as a measured current value;
Positioning a fault point of the collecting line according to the change of the measured current value of each node relative to the initial current value;
The step of locating the fault point of the collecting line according to the change of the measured current value of each node relative to the initial current value includes:
according to the current variation between the initial current value and the measured current value of each node, locating the node where the fault is located on the collecting line, and recording the node as a fault node;
determining the position of a fault point in the fault node range according to the current variation of the front node and the rear node of the fault node;
The step of locating the node where the fault is located on the collecting line according to the current variation between the initial current value and the measured current value of each node includes:
according to the topological structure of the current collecting circuit, establishing the corresponding relation between the position of each node and the current variation quantity of each node;
And determining the position of the node with the largest current variation according to the corresponding relation, namely the node with the fault on the current collecting line.
2. The collecting line fault locating method according to claim 1, wherein the step of determining the position of the fault point in the fault node range according to the current variation amounts of the nodes before and after the fault node includes:
According to the established corresponding relation, respectively performing linear fitting on nodes between the box transformer and the fault node and nodes between the fault node and the booster station of the collecting line;
And determining an intersection point of the two straight lines of the linear fitting, and positioning the position of the intersection point, namely the fault point of the current collecting line.
3. The method for locating a fault in a collector line according to claim 2, wherein the step of performing linear fitting on the nodes between the box transformer and the fault node and the node between the fault node and the booster station of the collector line, respectively, includes:
According to the topological structure of the current collecting circuit, establishing a coordinate system of the distance and the current variation of the box transformer of the current collecting circuit at the position of each node;
corresponding to the positions of the coordinate system where each node is located, linearly fitting the nodes between the box transformer of the collecting line in the coordinate system and the fault node to obtain a first straight line;
And linearly fitting the fault node in the coordinate system with a node between the booster station of the current collecting line to obtain a second straight line.
4. The method for positioning a fault in a collector line according to claim 3, wherein the step of determining an intersection of two straight lines of the linear fit and positioning a position where the intersection is located includes:
determining an intersection point of the first straight line and the second straight line;
determining the position of the intersection point relative to the previous node of the fault node, namely a first position;
Determining the position of the intersection point relative to the next node of the fault node, namely a second position;
and positioning an intersection point according to the first position and the second position.
5. The method for locating a fault in a collector line according to claim 1, wherein the step of disposing a plurality of nodes between a tank transformer and a booster station of the collector line includes:
determining the node setting position of the current collecting circuit according to the topological structure and circuit parameters of the current collecting circuit;
and setting nodes between the box transformer of the collecting line and the booster station according to the determined node setting positions.
6. A collector line fault locating system for implementing the collector line fault locating method of any one of claims 1 to 5, comprising:
the current detectors are arranged between the box transformer of the collecting line and the booster station, each node is provided with the current detector, and the high-frequency current pulse amplitude of each node on the collecting line in the initial state is detected as an initial current value through the current detector;
And the terminal is connected with the current detector, records the real-time high-frequency current pulse amplitude of the current detector in a to-be-detected state and is used as a measured current value, and the terminal positions the fault point of the current collecting circuit according to the change of the measured current value of each node relative to the initial current value.
7. The collector line fault locating system of claim 6, wherein the terminal comprises a processor and a display, the processor is respectively connected to a plurality of the current detectors, the processor processes the high-frequency current pulse amplitude detected by the current detectors to obtain a processing result, the display is connected with the processor, and the display displays the processing result of the processor.
8. The collector line fault location system of claim 7, wherein the terminal further comprises an alarm communicatively coupled to the processor, the alarm configured to issue an alarm message based on a result of processing by the processor.
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