Cable fault point positioning system and method based on impedance measurement

Abstract

The embodiment of the invention discloses a cable fault point positioning system and method based on impedance measurement, and the method comprises the steps: obtaining the fault state and integrated node data of a current fault line, determining a plurality of node selection ranges based on the fault state and the integrated node data, determining a fault positioning node according to the node selection ranges, and carrying out the positioning of a cable fault point. The fault positioning node is integrated with a current transformer and a voltage transformer, obtains current values and voltage values collected by the current transformer and the voltage transformer, calculates a relative phase difference between the voltage values and the current values, and determines a plurality of to-be-determined fault positions corresponding to the fault positioning node based on the relative phase difference. And determining the position overlapping number of the to-be-determined fault positions, and screening the to-be-determined fault positions according to the position overlapping number to obtain fault point positions. According to the scheme, the fault position is determined by integrating the nodes of the current transformer and the voltage transformer, and the cable fault position can be determined more accurately by arranging a small amount of integrated hardware and reasonably combining an impedance method.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of cable fault location, and in particular to a cable fault point location system and method based on impedance measurement. Background Art

[0002] The demand for electricity in cities is growing, and cables are widely used as a means of connecting circuits and transmission. The application of cables in power systems is increasing year by year and the scope of application is becoming wider and wider. However, cables are not easy to connect and have complex construction processes, which can easily lead to construction quality risks. In addition, most cables are buried underground, and their working environment is relatively harsh, so cable failures occur from time to time. Once a cable fails, it will directly affect the power supply of the power grid and cause serious losses to people's production and life. Therefore, when a cable failure occurs, the fault location of the cable should be accurately located in time and repaired quickly to avoid serious losses caused by cable failures.

[0003] Most of the related cable fault location technologies are to implant monitoring nodes in the cables and determine the fault location of the cables based on the abnormal monitoring values ​​and positioning data of the monitoring nodes. This method requires a lot of hardware and maintenance costs, and the positioning accuracy of the cable fault location is low. Summary of the invention

[0004] The embodiments of the present invention provide a cable fault point location positioning system and method based on impedance measurement, which solves the problems of large hardware and maintenance costs required in existing cable fault location technologies and low cable fault location positioning accuracy. The cable fault location can be determined more accurately by deploying a small amount of integrated hardware and reasonably combining the impedance method.

[0005] In a first aspect, an embodiment of the present invention provides a method for locating a cable fault point based on impedance measurement, comprising:

[0006] Acquire the fault status and integrated node data of the current fault line, determine multiple node selection ranges based on the fault status and the integrated node data, and determine a fault location node according to the node selection ranges, wherein the fault location node integrates a current transformer and a voltage transformer;

[0007] Obtaining the current value and the voltage value collected by the current transformer and the voltage transformer, calculating the relative phase difference between the voltage value and the current value, and determining a plurality of to-be-determined fault positions corresponding to the fault location node based on the relative phase difference;

[0008] The number of position overlaps of each to-be-determined fault position is determined, and the to-be-determined fault position is screened according to the number of position overlaps to obtain the fault point position.

[0009] Optionally, the determining multiple node selection ranges based on the fault state and the integrated node data includes:

[0010] Based on the fault status query cause mapping table, multiple fault causes of the fault line are obtained, and the fault causes are matched with the integrated node data to obtain multiple node selection ranges.

[0011] Optionally, the integrated node data includes node installation ranges of different installation reason types, and the matching process of the fault cause with the integrated node data to obtain multiple node selection ranges includes:

[0012] The fault cause is matched with the installation reason type. When the fault cause is successfully matched with the installation reason type, a node installation range corresponding to the installation reason type is determined as a node selection range.

[0013] Optionally, determining the fault location node according to the node selection range includes:

[0014] The quotient of the range length of the node selection range and the preset length is calculated, the node selection range is equally divided according to the quotient to obtain sub-selection ranges, and an integrated node in the sub-selection range is randomly selected to be determined as the fault location node.

[0015] Optionally, the screening of the to-be-determined fault locations according to the number of position overlaps to obtain the fault point location includes:

[0016] The number of position overlaps is compared with the number of fault location nodes to obtain a first comparison result, and the fault point position is determined according to the first comparison result and the to-be-determined fault position.

[0017] Optionally, determining the fault point location according to the first comparison result and the to-be-determined fault location includes:

[0018] Determine whether there is a number of position overlaps equal to the number of fault location nodes, and if so, determine the to-be-determined fault position corresponding to the number of position overlaps as the fault point position;

[0019] If not present, the number of position overlaps is compared with each other to obtain a second comparison result, and the fault point position is determined based on the second comparison result and the to-be-determined fault position.

[0020] Optionally, determining the fault point location based on the second comparison result and the to-be-determined fault location includes:

[0021] The to-be-determined fault position with the largest number of position overlaps is determined as the first overlap position, and the second overlap position of the fault location node not included in the first overlap position is determined among the remaining to-be-determined fault positions, and the first overlap position and the second overlap position are determined as the fault point positions.

[0022] In a second aspect, an embodiment of the present invention further provides a cable fault point location system based on impedance measurement, comprising:

[0023] The acquisition module is used to obtain the fault status of the current fault line and the integrated node data;

[0024] A range determination module, used for determining multiple node selection ranges based on the fault state and the integrated node data;

[0025] A node determination module, used to determine a fault location node according to the node selection range, wherein the fault location node is integrated with a current transformer and a voltage transformer;

[0026] The acquisition module is further used to acquire the current value and the voltage value collected by the current transformer and the voltage transformer;

[0027] A calculation module, used for calculating the relative phase difference between the voltage value and the current value;

[0028] A position determination module, used to determine a plurality of to-be-determined fault positions corresponding to the fault location node based on the relative phase difference;

[0029] The screening module is used to determine the number of overlaps of the positions of the to-be-determined fault positions, and screen the to-be-determined fault positions according to the number of overlaps to obtain the fault point positions.

[0030] In a third aspect, an embodiment of the present invention further provides a cable fault point location device based on impedance measurement, the device comprising:

[0031] one or more processors;

[0032] a storage device for storing one or more programs,

[0033] When the one or more programs are executed by the one or more processors, the one or more processors implement the cable fault point location method based on impedance measurement described in the embodiment of the present invention.

[0034] In a fourth aspect, an embodiment of the present invention further provides a storage medium storing computer executable instructions, which, when executed by a computer processor, are used to execute the cable fault point location method based on impedance measurement described in an embodiment of the present invention.

[0035] In an embodiment of the present invention, the fault state and integrated node data of the current fault line are obtained, multiple node selection ranges are determined based on the fault state and integrated node data of the current fault line, and the fault location node is determined according to the node selection range. The fault location node integrates a current transformer and a voltage transformer, obtains the current value and voltage value collected by the current transformer and the voltage transformer, calculates the relative phase difference between the voltage value and the current value, determines multiple to-be-determined fault positions corresponding to the fault location node based on the relative phase difference between the voltage value and the current value, determines the number of position overlaps of each to-be-determined fault position, and screens the to-be-determined fault position according to the number of position overlaps to obtain the fault point position. This solution determines the fault position by integrating the nodes of the current and voltage transformers, solves the problem that the existing cable fault location technology requires a lot of hardware and maintenance costs, and the positioning accuracy of the cable fault position is low, and can more accurately determine the cable fault position by deploying a small amount of integrated hardware and reasonably combining the impedance method. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flow chart of a cable fault point location method based on impedance measurement provided by an embodiment of the present invention;

[0037] Figure 2 A flowchart of a method for determining a node selection range based on a fault state and integrated node data provided by an embodiment of the present invention;

[0038] Figure 3 A flowchart of a method for screening fault point locations based on the number of position overlaps and the fault location to be determined provided by an embodiment of the present invention;

[0039] Figure 4 A module structure block diagram of a cable fault point location system based on impedance measurement provided by an embodiment of the present invention;

[0040] Figure 5 A schematic structural diagram of a cable fault point location device based on impedance measurement provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, rather than to limit the embodiments of the present invention. It is also necessary to explain that, for ease of description, only parts related to the embodiments of the present invention are shown in the accompanying drawings, rather than all structures.

[0042] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and or or" in the specification and claims represents at least one of the connected objects, and the character "or" generally indicates that the objects associated before and after are in an "or" relationship.

[0043] The cable fault point location positioning method based on impedance measurement provided in the embodiment of the present application can be applied to the precise positioning scenario of the cable fault position. The cable fault point location positioning method based on impedance measurement provided in the embodiment of the present application, the execution subject of each step can be a computer device, which refers to any electronic device with data calculation, processing and storage capabilities, such as mobile phones, PCs (Personal Computers), tablet computers and other terminal devices, and can also be servers and other devices, which are not limited in the embodiment of the present application.

[0044] Figure 1 A flow chart of a cable fault point location method based on impedance measurement provided by an embodiment of the present invention, such as Figure 1 As shown, specifically including:

[0045] Step S101: Obtain the fault status and integration node data of the current faulty line, and determine multiple node selection ranges based on the fault status and the integration node data.

[0046] Among them, the fault line is used to characterize the cable line where the fault occurs; the fault state is used to characterize the fault phenomenon of the cable line, which can be a power outage state, a leakage state, and other fault states; the integrated node data is the relevant data of the integrated node that has been set for the current fault line; the node selection range is used to characterize the location interval of the fault location node selected on the fault line. The fault state and integrated node data of the current fault line are obtained, and multiple node selection ranges are determined based on the fault state and integrated node data of the current fault line. In one embodiment, the current fault line is obtained as cable line a, the fault state of cable line a is a power outage state, and the integrated node data of cable line a is integrated node data A. Based on the fault state, the cause mapping table is queried to obtain multiple fault causes of the fault line. On cable line a, multiple node selection ranges are determined based on the power outage state and integrated node data A. Determining multiple node selection ranges based on the fault state of the current fault line and the integrated node data can improve the rationality and accuracy of fault location node selection.

[0047] Step S102: determining a fault location node according to the node selection range, wherein the fault location node integrates a current transformer and a voltage transformer.

[0048] Among them, the fault location node is an integrated node for measuring the location of the fault point; the current transformer is a measuring instrument that reduces the large current in the high-voltage power grid to a small current suitable for measurement through a transformation ratio, and the voltage transformer is a measuring instrument that converts the high voltage in the high-voltage power grid into a low voltage suitable for measurement through a transformation ratio. The cost of the integrated transformer is much lower than the cost of the data monitoring device. After determining multiple node selection ranges based on the fault state of the current fault line and the integrated node data, the fault location node is determined according to the determined node selection range, and the fault location node integrates the current transformer and the voltage transformer. Optionally, the quotient of the range length of the node selection range and the preset length is calculated, and the node selection range is divided into sub-selection ranges at equal intervals according to the calculated quotient, and an integrated node in the sub-selection range is randomly selected as the fault location node. In one embodiment, the node selection range is determined to be range 1, range 2 and range 3, the length of range 1 is 60 meters, the length of range 2 is 80 meters, the length of range 3 is 100 meters, and the preset length is 20 meters. The quotient a corresponding to range 1 is calculated to be 3, the quotient b corresponding to range 2 is 4, and the quotient c corresponding to range 3 is 5. Then, range 1, range 2 and range 3 are divided into three equal parts, four equal parts and five equal parts respectively to obtain the corresponding sub-selection ranges, and random selection is performed within each sub-selection range to obtain the fault location nodes within range 1 as integrated node A, integrated node B and integrated node C, the fault location nodes within range 2 as integrated node D, integrated node E, integrated node F and integrated node G, and the fault location nodes within range 3 as integrated node H, integrated node I, integrated node J, integrated node K and integrated node L.

[0049] Step S103, obtaining the current value and the voltage value collected by the current transformer and the voltage transformer, calculating the relative phase difference between the voltage value and the current value, and determining a plurality of to-be-determined fault positions corresponding to the fault location node based on the relative phase difference.

[0050] Among them, the relative phase difference is the phase difference between the current and voltage at the fault location node. The impedance method is a method used for measurement and protection in power systems. It is mainly used to detect fault points. The location of the fault is determined based on the relative phase difference between the current and voltage in the power system. When a fault occurs in the power system, there will be a relative phase difference between the current and voltage. By measuring the phase difference between the current and voltage, the distance between the fault point and the measurement position can be calculated; the undetermined fault position is used to characterize the location point waiting to be determined whether it is the fault point location. The current value and voltage value collected by the current transformer and the voltage transformer of each fault location node are obtained, and the relative phase difference between the collected voltage value and the current value is calculated. Based on the relative phase difference between the voltage value and the current value, multiple undetermined fault positions corresponding to the fault location node are determined. In one embodiment, three fault location nodes are determined, namely, fault location node 1, fault location node 2 and fault location node 3. Taking fault location node 1 as an example, the current value collected by the current transformer 1 of the fault location node 1 is m amperes, and the voltage value collected by the voltage transformer 1 is n volts. The current value m amperes and the voltage value n volts are substituted into a specific mathematical formula to obtain a fault point distance of y meters. The positions on the fault line that are y meters away from the fault location node are positions A and B. Position A and position B are determined as the to-be-determined fault positions corresponding to the fault location node 1. The to-be-determined fault positions corresponding to the fault location node 2 and the fault location node 3 are determined in the same way.

[0051] Step S104: determining the number of overlaps of the positions of the to-be-determined fault locations, and screening the to-be-determined fault locations according to the number of overlaps to obtain the fault point locations.

[0052] Among them, the number of position overlaps is used to characterize the number of fault location nodes corresponding to the to-be-determined fault location; the fault point location is used to characterize the specific fault location on the fault line that is finally determined. After multiple to-be-determined fault locations are determined, the number of position overlaps of each to-be-determined fault location is determined, and the to-be-determined fault locations are screened according to the number of position overlaps of each to-be-determined fault location to obtain the fault point location. In one embodiment, three fault location nodes and four fault locations to be determined are determined. The fault location nodes are fault location node 1, fault location node 2, and fault location node 3, and the fault locations to be determined are fault location a to be determined, fault location b to be determined, fault location c to be determined, and fault location d to be determined. The fault location node corresponding to the fault location a to be determined is fault location node 1, that is, the number of position overlaps is 1. The fault location nodes corresponding to the fault location b to be determined are fault location nodes 1, 2, and 3, that is, the number of position overlaps is 3. The fault location node corresponding to the fault location c to be determined is fault location node 2, that is, the number of position overlaps is 1. The fault location node corresponding to the fault location d to be determined is fault location node 3, that is, the number of position overlaps is 1. According to the number of position overlaps of each fault location to be determined, the fault locations to be determined are screened to obtain the fault point locations.

[0053] As can be seen from the above, the fault status and integrated node data of the current fault line are obtained, and multiple node selection ranges are determined based on the fault status and integrated node data of the current fault line, and the fault location node is determined according to the node selection range. The fault location node integrates a current transformer and a voltage transformer, obtains the current value and voltage value collected by the current transformer and the voltage transformer, calculates the relative phase difference between the voltage value and the current value, and determines the multiple to-be-determined fault positions corresponding to the fault location node based on the relative phase difference between the voltage value and the current value, determines the number of position overlaps of each to-be-determined fault position, and screens the to-be-determined fault position according to the number of position overlaps to obtain the fault point position. This solution determines the fault position by integrating the nodes of current and voltage transformers, which solves the problem that the existing cable fault location technology requires a lot of hardware and maintenance costs, and the positioning accuracy of the cable fault position is low. It can more accurately determine the cable fault position by deploying a small amount of integrated hardware and reasonably combining the impedance method.

[0054] Figure 2 A flowchart of a method for determining a node selection range based on a fault state and integrated node data is provided in an embodiment of the present invention, such as Figure 2 As shown, specifically including:

[0055] Step S201, obtaining the fault status and integrated node data of the current fault line, querying a cause mapping table based on the fault status to obtain multiple fault causes of the fault line, and matching the fault causes with the integrated node data to obtain multiple node selection ranges.

[0056] Among them, the inducement mapping table is used to characterize the correspondence between different types of fault states and different types of fault inducements; the fault inducement is used to characterize the cause that may cause the fault state to occur. After obtaining the fault state of the current fault line and the integrated node data, the inducement mapping table is queried based on the fault state of the current fault line to obtain multiple fault inducements of the fault line, and the fault inducements are matched with the integrated node data of the fault line to obtain multiple node selection ranges. Optionally, the integrated node data includes node installation ranges of different installation reason types, and multiple fault inducements are matched with the installation reason type of the node installation range. When the fault inducement and the installation reason type are successfully matched, the node installation range corresponding to the successfully matched installation reason type is determined as the node selection range, wherein the installation reason type is used to characterize the reason for installing the integrated node in the node installation range. In one embodiment, the fault state of the current fault line is obtained as a power outage state, and the integrated node data includes node installation ranges 1, 2, 3, and 4. The installation reason types corresponding to node installation ranges 1 and 2 are that the insulation layer is easily damaged, the installation reason type of node installation range 3 is susceptible to bad weather, and the installation reason type of node installation range 4 is susceptible to electromagnetic interference. Based on the power outage state, the cause mapping table is queried to obtain that the fault cause a is the insulation layer damage, and the fault cause b is the bad weather. Multiple fault causes are matched with the installation reason types of the node installation ranges. The matching result is that the fault cause a successfully matches the installation reason types of the node installation ranges 1 and 2, and the fault cause b successfully matches the installation type of the node installation range 3, then the node installation ranges 1, 2, and 3 are determined as the node selection range. In another embodiment, multiple fault causes and the installation reason types of the node installation ranges are input into the trained matching model to obtain the node selection range.

[0057] Step S202: determining a fault location node according to the node selection range, wherein the fault location node integrates a current transformer and a voltage transformer.

[0058] Step S203: acquiring the current value and the voltage value collected by the current transformer and the voltage transformer, calculating the relative phase difference between the voltage value and the current value, and determining a plurality of to-be-determined fault locations corresponding to the fault location node based on the relative phase difference.

[0059] Step S204: determining the number of overlaps of the fault locations to be determined, and screening the fault locations to be determined according to the number of overlaps to obtain the fault point locations.

[0060] As can be seen from the above, after obtaining the fault status and integrated node data of the current fault line, the cause mapping table is queried based on the fault status of the current fault line to obtain multiple fault causes of the fault line, and the fault causes are matched with the integrated node data of the fault line to obtain multiple node selection ranges. This solution determines multiple node selection ranges by the fault status and integrated node data of the current fault line, which can improve the rationality and accuracy of fault location node selection.

[0061] Figure 3 A flowchart of a method for screening fault point locations based on the number of position overlaps and the fault location to be determined provided by an embodiment of the present invention, such as Figure 3 As shown, specifically including:

[0062] Step S301: Obtain the fault status and integrated node data of the current faulty line, and determine multiple node selection ranges based on the fault status and the integrated node data.

[0063] Step S302: determining a fault location node according to the node selection range, wherein the fault location node integrates a current transformer and a voltage transformer.

[0064] Step S303: acquiring the current value and the voltage value collected by the current transformer and the voltage transformer, calculating the relative phase difference between the voltage value and the current value, and determining a plurality of to-be-determined fault locations corresponding to the fault location node based on the relative phase difference.

[0065] Step S304: determine the number of overlaps of the fault locations to be determined, compare the number of overlaps with the number of fault location nodes to obtain a first comparison result, and determine the fault point location according to the first comparison result and the fault locations to be determined.

[0066] Among them, after determining the number of position overlaps of each to-be-determined fault position, the number of position overlaps of the to-be-determined fault position is compared with the number of fault location nodes to obtain a first comparison result, and the fault point position is determined according to the first comparison result and the to-be-determined fault position. Optionally, it is determined whether the number of position overlaps of the to-be-determined fault position is equal to the number of fault location nodes. If so, the to-be-determined fault position corresponding to the number of position overlaps is determined as the fault point position. If not, the number of position overlaps of the to-be-determined fault position is compared with each other to obtain a second comparison result, and the fault point position is determined based on the second comparison result and the to-be-determined fault position. Optionally, the to-be-determined fault position with the largest number of position overlaps is determined as the first overlap position, and the second overlap position of the fault location node not included in the first overlap position is determined among the remaining to-be-determined fault positions, and the first overlap position and the second overlap position are determined as the fault point position. In one embodiment, the fault locating nodes are respectively fault locating node 1, fault locating node 2 and fault locating node 3, the number of fault locating nodes is 3, the fault locating node corresponding to the fault position a to be determined is fault locating node 1, and the number of position overlaps is 1; the fault locating nodes corresponding to the fault position b to be determined are fault locating nodes 1, 2, and 3, and the number of position overlaps is 3; the fault locating node corresponding to the fault position c to be determined is fault locating node 2, and the number of position overlaps is 1; the fault locating node corresponding to the fault position d to be determined is fault locating node 3, and the number of position overlaps is 1; the number of position overlaps of the fault position b to be determined is 3, which is equal to the number of fault locating nodes, and the fault position b to be determined is determined as the fault point position. In another embodiment, the fault location nodes are fault location nodes 1, 2, 3, 4, and 5, respectively, and the number of fault location nodes is 5. The fault location node corresponding to the to-be-determined fault position a is fault location node 1, the fault location node corresponding to the to-be-determined fault position b is fault location nodes 1, 2, and 3, the fault location node corresponding to the to-be-determined fault position c is fault location node 2, and the fault location node corresponding to the to-be-determined fault position d is fault location nodes 4 and 5. There is no to-be-determined fault position whose number of overlapping positions is equal to the number of fault location nodes. The to-be-determined fault position with the largest number of overlapping positions is the to-be-determined fault position b, that is, the to-be-determined fault position b is the first overlapping position, the fault location nodes not included in the to-be-determined fault position b are fault location nodes 4 and 5, and the fault location nodes corresponding to the to-be-determined fault position d are fault location nodes 4 and 5, that is, the to-be-determined fault position d is the second overlapping position, and the to-be-determined fault positions b and d are determined as fault point positions.

[0067] As can be seen from the above, after determining the number of overlaps of each to-be-determined fault location, the number of overlaps of the to-be-determined fault location is compared with the number of fault location nodes to obtain a first comparison result, and the fault point location is determined based on the first comparison result and the to-be-determined fault location. This solution screens the to-be-determined fault location based on the number of overlaps to obtain the fault point location, and can more reasonably and accurately determine the specific fault location of the faulty line.

[0068] Figure 4 The module structure block diagram of a cable fault point location positioning system based on impedance measurement provided by an embodiment of the present invention is used to execute the cable fault point location positioning method based on impedance measurement provided by the above embodiment, and has the corresponding functional modules and beneficial effects of the execution method. Figure 4 As shown, the system specifically includes:

[0069] The acquisition module 101 is used to acquire the fault status of the current fault line and the integrated node data;

[0070] A range determination module 102, configured to determine multiple node selection ranges based on the fault state and the integrated node data;

[0071] A node determination module 103, configured to determine a fault location node according to the node selection range, wherein the fault location node is integrated with a current transformer and a voltage transformer;

[0072] The acquisition module 101 is further used to acquire the current value and the voltage value collected by the current transformer and the voltage transformer;

[0073] A calculation module 104, configured to calculate a relative phase difference between the voltage value and the current value;

[0074] A position determination module 105, configured to determine a plurality of to-be-determined fault positions corresponding to the fault location node based on the relative phase difference;

[0075] The screening module 106 is used to determine the number of overlaps of the positions of the to-be-determined fault locations, and screen the to-be-determined fault locations according to the number of overlaps to obtain the fault point locations.

[0076] It can be seen from the above scheme that the fault status and integrated node data of the current fault line are obtained, multiple node selection ranges are determined based on the fault status and integrated node data of the current fault line, and the fault location node is determined according to the node selection range. The fault location node integrates a current transformer and a voltage transformer, obtains the current value and voltage value collected by the current transformer and the voltage transformer, calculates the relative phase difference between the voltage value and the current value, and determines multiple to-be-determined fault positions corresponding to the fault location node based on the relative phase difference between the voltage value and the current value, determines the number of position overlaps of each to-be-determined fault position, and screens the to-be-determined fault position according to the number of position overlaps to obtain the fault point position. This scheme determines the fault position by integrating the nodes of current and voltage transformers, which solves the problem that the existing cable fault location technology requires a lot of hardware and maintenance costs, and the positioning accuracy of the cable fault position is low. It can more accurately determine the cable fault position by deploying a small amount of integrated hardware and reasonably combining the impedance method.

[0077] In a possible embodiment, the range determination module 102 is specifically configured to:

[0078] Based on the fault status query cause mapping table, multiple fault causes of the fault line are obtained, and the fault causes are matched with the integrated node data to obtain multiple node selection ranges.

[0079] In a possible embodiment, the range determination module 102 is further configured to:

[0080] The fault cause is matched with the installation reason type. When the fault cause is successfully matched with the installation reason type, a node installation range corresponding to the installation reason type is determined as a node selection range.

[0081] In a possible embodiment, the node determination module 103 is specifically configured to:

[0082] The quotient of the range length of the node selection range and the preset length is calculated, the node selection range is equally divided according to the quotient to obtain sub-selection ranges, and an integrated node in the sub-selection range is randomly selected to be determined as the fault location node.

[0083] In a possible embodiment, the screening module 106 is specifically used to:

[0084] The number of position overlaps is compared with the number of fault location nodes to obtain a first comparison result, and the fault point position is determined according to the first comparison result and the to-be-determined fault position.

[0085] In a possible embodiment, the screening module 106 is further used to:

[0086] Determine whether there is a number of position overlaps equal to the number of fault location nodes, and if so, determine the to-be-determined fault position corresponding to the number of position overlaps as the fault point position;

[0087] If not present, the number of position overlaps is compared with each other to obtain a second comparison result, and the fault point position is determined based on the second comparison result and the to-be-determined fault position.

[0088] In a possible embodiment, the screening module 106 is further used to:

[0089] The to-be-determined fault position with the largest number of position overlaps is determined as the first overlap position, and the second overlap position of the fault location node not included in the first overlap position is determined among the remaining to-be-determined fault positions, and the first overlap position and the second overlap position are determined as the fault point positions.

[0090] Figure 5 A schematic diagram of a cable fault point location device based on impedance measurement provided by an embodiment of the present invention, such as Figure 5 As shown, the device includes a processor 201, a memory 202, an input device 203 and an output device 204; the number of processors 201 in the device can be one or more. Figure 5 A processor 201 is taken as an example; the processor 201, memory 202, input device 203 and output device 204 in the device can be connected by a bus or other means. Figure 5 In the example, the connection through the bus is taken. The memory 202, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions or modules corresponding to the cable fault point location method based on impedance measurement in the embodiment of the present invention. The processor 201 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 202, that is, realizes the above-mentioned cable fault point location method based on impedance measurement. The input device 203 can be used to receive input digital or character information, and generate key signal input related to user settings and function control of the device. The output device 204 may include a display device such as a display screen.

[0091] The embodiment of the present invention further provides a storage medium containing computer executable instructions, wherein the computer executable instructions are used to execute a method for locating a cable fault point based on impedance measurement when executed by a computer processor, the method comprising:

[0092] Acquire the fault status and integrated node data of the current fault line, determine multiple node selection ranges based on the fault status and the integrated node data, and determine a fault location node according to the node selection ranges, wherein the fault location node integrates a current transformer and a voltage transformer;

[0093] Obtaining the current value and the voltage value collected by the current transformer and the voltage transformer, calculating the relative phase difference between the voltage value and the current value, and determining a plurality of to-be-determined fault positions corresponding to the fault location node based on the relative phase difference;

[0094] The number of position overlaps of each to-be-determined fault position is determined, and the to-be-determined fault position is screened according to the number of position overlaps to obtain the fault point position.

[0095] It is worth noting that in the above-mentioned embodiment of the cable fault point location method system based on impedance measurement, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the embodiments of the present invention.

[0096] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the embodiments of the present invention are not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the embodiments of the present invention. Therefore, although the embodiments of the present invention are described in more detail through the above embodiments, the embodiments of the present invention are not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the embodiments of the present invention, and the scope of the embodiments of the present invention is determined by the scope of the appended claims.

Claims

1. A cable fault point location method based on impedance measurement, characterized in that: include: Acquire the fault status and integrated node data of the current fault line, determine multiple node selection ranges based on the fault status and the integrated node data, and determine a fault location node according to the node selection ranges, wherein the fault location node integrates a current transformer and a voltage transformer; Obtaining the current value and the voltage value collected by the current transformer and the voltage transformer, calculating the relative phase difference between the voltage value and the current value, and determining a plurality of to-be-determined fault positions corresponding to the fault location node based on the relative phase difference; The number of position overlaps of each to-be-determined fault position is determined, and the to-be-determined fault position is screened according to the number of position overlaps to obtain the fault point position.

2. The cable fault point location method based on impedance measurement according to claim 1 is characterized in that: The determining of multiple node selection ranges based on the fault state and the integrated node data includes: Based on the fault status query cause mapping table, multiple fault causes of the fault line are obtained, and the fault causes are matched with the integrated node data to obtain multiple node selection ranges.

3. The cable fault point location method based on impedance measurement according to claim 2 is characterized in that: The integrated node data includes node installation ranges of different installation reason types, and the matching process of the fault cause with the integrated node data to obtain multiple node selection ranges includes: The fault cause is matched with the installation reason type. When the fault cause is successfully matched with the installation reason type, a node installation range corresponding to the installation reason type is determined as a node selection range.

4. The cable fault point location method based on impedance measurement according to any one of claims 1 to 3, characterized in that: The determining of the fault location node according to the node selection range includes: The quotient of the range length of the node selection range and the preset length is calculated, the node selection range is equally divided according to the quotient to obtain sub-selection ranges, and an integrated node in the sub-selection range is randomly selected to be determined as the fault location node.

5. The cable fault point location method based on impedance measurement according to any one of claims 1 to 4, characterized in that: The step of screening the to-be-determined fault positions according to the number of position overlaps to obtain the fault point position includes: The number of position overlaps is compared with the number of fault location nodes to obtain a first comparison result, and the fault point position is determined according to the first comparison result and the to-be-determined fault position.

6. The cable fault point location method based on impedance measurement according to claim 5, characterized in that: The determining the fault point location according to the first comparison result and the to-be-determined fault location includes: Determine whether there is a number of position overlaps equal to the number of fault location nodes, and if so, determine the to-be-determined fault position corresponding to the number of position overlaps as the fault point position; If not present, the number of position overlaps is compared with each other to obtain a second comparison result, and the fault point position is determined based on the second comparison result and the to-be-determined fault position.

7. The cable fault point location method based on impedance measurement according to claim 6, characterized in that: The determining the fault point location based on the second comparison result and the to-be-determined fault location includes: The to-be-determined fault position with the largest number of position overlaps is determined as the first overlap position, and the second overlap position of the fault location node not included in the first overlap position is determined among the remaining to-be-determined fault positions, and the first overlap position and the second overlap position are determined as the fault point positions.

8. A cable fault point location positioning system based on impedance measurement, characterized in that: include: The acquisition module is used to obtain the fault status of the current fault line and the integrated node data; A range determination module, used for determining multiple node selection ranges based on the fault state and the integrated node data; A node determination module, used to determine a fault location node according to the node selection range, wherein the fault location node is integrated with a current transformer and a voltage transformer; The acquisition module is further used to acquire the current value and the voltage value collected by the current transformer and the voltage transformer; A calculation module, used for calculating the relative phase difference between the voltage value and the current value; A position determination module, used to determine a plurality of to-be-determined fault positions corresponding to the fault location node based on the relative phase difference; The screening module is used to determine the number of overlaps of the positions of the to-be-determined fault positions, and screen the to-be-determined fault positions according to the number of overlaps to obtain the fault point positions.

9. A cable fault point location device based on impedance measurement, the device comprising: one or more processors; A storage device for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors implement the cable fault point location method based on impedance measurement as described in any one of claims 1-7.

10. A storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the cable fault point location method based on impedance measurement as described in any one of claims 1 to 7 when executed by a computer processor.

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