A cable fault locating method and system based on distributed signal detection

Abstract

This invention relates to a cable fault location method and system based on distributed signal detection, belonging to the field of cable detection technology. The method includes: acquiring leakage current data in response to a preset detection signal; determining a detection device number group and a generator number based on the leakage current data; controlling the generator corresponding to the generator number to perform DC power transmission; obtaining current data through the detection device corresponding to the detection device number group; comparing the obtained current data to obtain a current data ratio; and determining and outputting the cable fault location area by combining the current data ratio with a preset cable segment length. This invention improves the accuracy and efficiency of cable fault location prediction.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, and in particular to a cable fault location method and system based on distributed signal detection. Background Technology

[0002] In the field of power system transmission and distribution network operation and maintenance, efficient cable fault location is crucial for ensuring power supply reliability, shortening power outage duration, and reducing operation and maintenance costs. Cable fault location typically involves three core stages: diagnosis, pre-location, and precise location. Pre-location, by narrowing down the fault area to a specific section, is a prerequisite for subsequent accurate fault location.

[0003] Currently, the main technologies for pre-locating cable grounding faults in the industry include the bridge method, voltage drop method, low-voltage pulse method, and traveling wave method. One of these methods uses distributed current detection technology, combined with the interactive capabilities of the Internet of Things and wireless data transmission, to perform segmented real-time synchronous detection of long cables, enabling rapid pre-location of the fault area.

[0004] Regarding the aforementioned technologies, in the actual process of measuring fault points with DC current, the injected DC current will leak at the first fault point encountered, causing the fault points in the subsequent cable to be located only after the previous fault points are repaired. Therefore, there is still significant room for improvement in the efficiency and accuracy of fault point location. Summary of the Invention

[0005] To improve the efficiency and accuracy of fault location, this invention provides a cable fault location method and system based on distributed signal detection.

[0006] In a first aspect, the present invention provides a cable fault location method based on distributed signal detection, employing the following technical solution: A cable fault location method based on distributed signal detection includes: Step 1: In response to a preset detection signal, acquire leakage current data; Step 2: Determine the detection device number group and the generating device number based on the leakage current data; Step 3: Control the generator corresponding to the generator number to perform DC power transmission operation; Step 4: Obtain current data through the detection device corresponding to the detection device number group; Step 5: Compare the obtained current data to obtain the current data ratio; Step 6: Determine the cable fault area by comparing the current data with the preset cable segment length and output the result.

[0007] By adopting the above technical solution, the corresponding detection device number group and generating device number are determined by the leakage current data. Then, DC current is emitted to obtain current data. Based on the current data, it is determined whether there is a fault in the cable. At the same time, the current data ratio is determined to obtain the cable fault point area. In most cases, it can simultaneously locate multiple fault points that exist in segments. Moreover, the cable fault point can be accurately obtained during pre-location, avoiding the problem of DC current being output at one fault point. This improves the efficiency and accuracy of cable fault point pre-location.

[0008] Optionally, methods for determining the detection device number group and the generating device number based on leakage current data include: Step 20: Obtain the detection device number based on the leakage current data; Step 21: Filter the detection device numbers based on preset adjacency rules to obtain adjacent detection device numbers; Step 22: Form adjacent device number groups based on adjacent detection device numbers and define them as detection device number groups; Step 23: Compare the detection device numbers within the detection device number group to obtain the smaller detection device number; Step 24: Find the corresponding small-size generating device number based on the small-size detection device number and define it as the generating device number.

[0009] By adopting the above technical solution, the corresponding detection device number is located through leakage current data, and a pair of detection device number groups are formed according to the adjacent rules. Then, the smaller detection device is determined by comparing the numbers to match the corresponding generating device. This can quickly and accurately locate the detection and transmitting units required for fault detection, and improve the efficiency and accuracy of device matching in the early stage of cable fault location.

[0010] Optionally, the method of finding the corresponding small-size generating device number based on the small-size detection device number and defining it as the generating device number includes: Step 240: Obtain the fault segment number through leakage current data; Step 241: Obtain the adjacent fault segment numbers based on the adjacent rules and fault segment numbers; Step 242: If the adjacent fault segment number does not exist, find the corresponding small generating device number based on the small detection device number and define it as the generating device number; Step 243: If adjacent fault segment numbers exist, count the number of adjacent fault segments; Step 244: Obtain fault detection numbers based on adjacent fault segment numbers and combine them to form continuous device number groups; Step 245: Extract the large-size detection device number and the small-size detection device number from the continuous device number group; Step 246: When the number of adjacent fault segments is equal to 2, define the number of the smaller fault generator as the number of the first fault generator; Step 247: Find the corresponding large-size generating device number through the large-size detection device number and define it as the second generating device number.

[0011] By adopting the above technical solution, the distribution of adjacent fault segments is determined according to the fault segment number. For a single fault segment, the corresponding generating device is directly matched. For multiple consecutive fault segments, the generating devices corresponding to the large and small detection devices are selected as the sequential generating devices. This avoids the situation where blindly transmitting DC power when there are consecutive fault segments, which may cause positioning errors. This improves the flexibility and applicability of the fault location device configuration.

[0012] Optional, also includes: Step 248: When the number of adjacent fault segments is greater than 2, find the corresponding large-scale generating device number and small-scale generating device number by using the large-scale detection device number and small-scale detection device number, and define them as the first device number; Step 249: Determine the initial fault segment number based on the initial device number; Step 250: Filter the adjacent fault segment numbers according to the initial fault segment number to update the adjacent fault segment numbers; Step 251: Repeat steps 248 to 250 based on the updated adjacent fault segment numbers until the number of adjacent fault segments is equal to 2 or the adjacent fault segment numbers do not exist.

[0013] By adopting the above technical solution, when there are too many adjacent fault segments, the generating device corresponding to the large and small detection devices is used as the first device and the fault segments are gradually screened and updated. By cyclically reducing the number of adjacent fault segments to the detectable range, signal interference and positioning confusion caused by simultaneous detection of multiple consecutive fault segments are avoided, thereby improving the stability and accuracy of fault location for long-distance multi-segment cables.

[0014] Optionally, methods for obtaining adjacent fault segment numbers based on adjacent rules and fault segment numbers include: Step 2410: Obtain the device number to be tested based on the fault segment number; Step 2411: Arrange the device numbers to be tested according to the adjacency rule to obtain the order of devices to be tested and count the number of adjacent devices; Step 2412: When the number of adjacent devices is greater than 2, determine the verification device number group based on the order of devices to be detected and the preset one-alternate rule; Step 2413: Determine the receiving device number group based on the verification device number group; Step 2414: Control the generator corresponding to the verification device number group to perform DC power transmission operation; Step 2415: When all the detection devices corresponding to the receiving device number group have received current data, determine the fault segment number based on the detection device sorting. Step 2416: Filter the adjacent fault segment numbers according to the adjacent rules to obtain the adjacent fault segment numbers.

[0015] By adopting the above technical solution, the device number to be tested is obtained by fault segment number and sorted and counted. In the case of too many adjacent devices, the verification and receiving device group is determined by combining the rule of one-every-one. The fault segment is locked by the DC transmission and current reception. Then, the adjacent fault segment numbers are filtered to avoid misjudgment of fault segments caused by too many adjacent devices and improve the accuracy of obtaining adjacent fault segment numbers.

[0016] Optionally, when all detection devices corresponding to the receiving device number group receive current data, the method for determining the fault segment number based on the detection device order includes: Step 24150: Extract the smallest number from the verification device number group; Step 24151: Based on the adjacency rule and the minimum number, find the adjacent minimum device number and define it as the generating device number; Step 24152: Perform steps 3 to 4 to obtain fault leakage current data; Step 24153: Define the minimum number as the generating device number and execute steps 3 to 4 to obtain the verification leakage current data; Step 24154: When the fault leakage current data is consistent with the verification leakage current data, determine the independent fault segment number based on the fault leakage current data and output it. Step 24155: When the fault leakage current data is inconsistent with the verification leakage current data, determine the fault segment number based on the sorting of the detection device.

[0017] By adopting the above technical solution, the minimum verification device number is extracted and DC current is emitted by adjacent minimum devices and the minimum verification device respectively. The two sets of leakage current data are compared to determine whether the fault segment number needs to be determined, so as to accurately identify the real fault segment and improve the reliability of fault segment determination and the accuracy of fault location.

[0018] Optionally, it also includes a method for updating the detection device number group, the method comprising: Step 220: Obtain the damaged device number; Step 221: Obtain the number of the device to be assembled based on the damaged device number and the detection device number group; Step 222: Combine the damaged device number, the device number to be assembled, and the adjacent number rule to find the adjacent damaged device number; Step 223: Replace the damaged device number with the adjacent damaged number and combine it with the device number to be combined to form an updated adjacent number group.

[0019] By adopting the above technical solution, the device number to be combined is screened and matched according to the damaged device number, and the adjacent damaged device number is obtained according to the adjacent rule to replace the damaged device number to update the detection device number group, ensuring the continuous and stable execution of the fault location process and improving the fault tolerance and operational continuity of the distributed detection system.

[0020] Optionally, methods for obtaining the damaged device number include: Step 2200: Locate the unique detection number based on the detection device number; Step 2201: If an independent detection number exists, find the corresponding independent occurrence number based on the independent detection number; Step 2202: Define the independent generation number as the generation device number and execute steps 3 to 4 to obtain DC data; Step 2203: Determine and output the damaged device number based on the DC current data and the independent detection number combined with the adjacent rules.

[0021] By adopting the above technical solution, taking the independent detection number as the starting point, the corresponding independent occurrence number is locked and DC power is emitted to acquire data. Combining the DC power data with adjacent rules, the fault device number is accurately located and output, avoiding fault location deviation caused by abnormal detection device, and improving the continuity and accuracy of the fault location process.

[0022] Optionally, methods for obtaining the detection device number based on leakage current data include: Step 200: Obtain environmental parameters; Step 201: Find the corresponding safety data based on the environmental parameters and compare it with the leakage current data; Step 202: If the safety data is greater than the leakage data, the leakage data is treated as normal data and output. Step 203: If the safety data is less than the leakage data, obtain the detection device number corresponding to the leakage data.

[0023] By adopting the above technical solution, combining environmental parameters with corresponding safety data and comparing them with leakage data, normal leakage and abnormal leakage can be distinguished. Only when the leakage exceeds the safe range is the corresponding current device number extracted as the detection device number, which reduces the impact of environmental interference on the judgment of normal leakage data and improves the accuracy of the detection device number determination.

[0024] Secondly, the present invention provides a cable fault location system based on distributed signal detection, which adopts the following technical solution: A cable fault location system based on distributed signal detection includes: The acquisition module is used to acquire leakage current data and environmental parameters; A memory for storing a program for a cable fault location method based on distributed signal detection as described above; The processor loads and executes programs from memory.

[0025] By adopting the above technical solution, the acquisition module accurately collects leakage current data and environmental parameters, providing basic data support for fault diagnosis. The memory stably stores the complete program of the fault location method, ensuring that the process can be repeatedly called and executed stably. The processor loads and runs the program, linking various modules to complete all-round operations such as data comparison, thereby improving the efficiency and stability of cable fault location.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: The system determines the corresponding detection device number group and generator number by using leakage current data, and then emits DC current to obtain current data. Based on the current data, it determines whether there is a cable fault and simultaneously determines the current data ratio to obtain the cable fault point area. In some cases, the system can identify multiple cable fault points at once, and accurately locate the cable fault point during pre-positioning. This avoids the problem of all DC current being output at one fault point, and improves the efficiency and accuracy of cable fault point pre-positioning. When adjacent fault segments exist, by determining the order of occurrence or locating the initial device, the detection device will not deviate from the pre-location of the fault point due to receiving multiple DC data simultaneously, thus improving the reliability of the pre-location of the fault point. By verifying the current data and analyzing whether there are multiple sets of data, the faulty section of the cable can be accurately identified. This avoids the situation where multiple continuous detection devices receive current data, which could lead to inaccurate identification of the faulty section and improves the reliability of faulty section identification. Attached Figure Description

[0027] Figure 1 This is a flowchart of a cable fault location method based on distributed signal detection according to an embodiment of this application. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0029] This invention discloses a cable fault location method based on distributed signal detection. (Refer to...) Figure 1 A cable fault location method based on distributed signal detection includes: Step 1: In response to the preset detection signal, acquire leakage current data.

[0030] The detection signal refers to the control command signal that triggers the leakage current data acquisition process in the distributed cable fault location detection procedure. The response method for this detection signal is as follows: the system monitors cable leakage current data in real time; when it receives current data exceeding a threshold, the system automatically generates and triggers a detection signal as a response; or, a person skilled in the art can trigger the signal via an electrical signal button on the control terminal or system to achieve the response.

[0031] Leakage current data refers to the electrical signal data generated after the leakage current of a cable due to decreased insulation performance, environmental influences, or faults is collected by a detection device. The leakage current data is acquired by the system using distributed detection devices deployed along sections of the cable to collect the cable-to-ground leakage current in real time and convert it into identifiable electrical signal data.

[0032] Step 2: Determine the detection device number group and the generating device number based on the leakage current data.

[0033] The detection device number group refers to the unique combination of the numbers of two adjacent distributed detection devices arranged along the cable segment. The detection device number group is determined by pairing the corresponding two detection device numbers based on the collected leakage current data. The specific method will be described in the following steps. The generator number refers to the unique number of the generator used to emit DC current into the cable. The generator number is determined by assigning a DC current emitting generator to each detection device. Personnel skilled in the art number the generators next to each detection device and inputs this number into the system. The system matches and searches for the corresponding generator number based on the detection device number group to complete the determination. The specific method will be described in the following steps.

[0034] Step 3: Control the generator corresponding to the generator number to perform DC electric emission operation.

[0035] DC current emission operation refers to the action of injecting a stable DC current into a cable line by a generating device. The execution method of this DC current emission operation is as follows: the system sends a drive command to the corresponding generating device according to the generating device number, controlling the DC drive circuit inside the generating device to conduct and output a constant DC current to the cable conductor. The specific value of this DC current is set by those skilled in the art according to actual testing requirements, for example: 10mA to 100mA.

[0036] Step 4: Obtain the current data through the detection device corresponding to the detection device number group.

[0037] Current data refers to the electrical signal values ​​collected by the detection device. Here, the current data is obtained by having two detection devices in the detection device group (numbered group) collect the DC current signal from the leak at the fault point, convert it into a digital signal, and then upload it to the system.

[0038] Step 5: Compare the obtained current data to obtain the current data ratio.

[0039] The current data ratio refers to the ratio obtained by dividing current data by their numerical values. Here, the current data ratio is obtained by dividing two data points obtained from a fault in a segmented cable by using one current data point as the numerator and the other as the denominator.

[0040] Step 6: Determine the cable fault area by comparing the current data with the preset cable segment length and output the result.

[0041] The cable segment length refers to the length of the cable line between two distributed detection or generation devices. This cable segment length is obtained by inputting the actual settings into the system by those skilled in the art. The cable fault point area refers to the specific range within which the cable insulation is damaged or there is a leakage fault. The cable fault point area is determined by the system using the ratio of current data reflecting the fault location, combined with the cable segment lengths between the devices, for inverse proportional calculation. For example, if the cable segment length is 10 meters and the current data ratio is 4:6 for device 2 to device 3, then according to the inverse proportional calculation, the ratio of the cable fault point area distance from device 2 to device 3 should be 6:4, meaning the cable fault point is 6 meters away from device 2. The cable fault point area is output by the system displaying the calculated fault range distance, corresponding device number, and location information in text, numerical, or graphical form to the control terminal or corresponding interface. By combining the steps described above, the monitoring device corresponding to each group of detection device numbers and the generation device corresponding to each generation device number can simultaneously transmit and detect current data, thereby achieving simultaneous detection of cable fault points across multiple cable segments.

[0042] The methods for determining the detection device number group and the generating device number based on leakage current data include: Step 20: Obtain the detection device number based on the leakage current data.

[0043] The detection device number refers to the unique identifier of the device used to detect cable leakage current. The detection device number is obtained by having professionals in the field assign a unique identifier to each detection device based on actual needs, and then inputting it into the system. When the system receives leakage current data, it automatically retrieves the corresponding detection device number.

[0044] Step 21: Filter the detection device numbers based on preset adjacency rules to obtain adjacent detection device numbers.

[0045] The adjacency rule refers to the criteria for determining whether the physical locations and numbering sequences of the detection devices laid along the cable are adjacent. This adjacency rule is established experimentally by those skilled in the art and then input into the system. Adjacent detection device numbers refer to the unique numbers of detection devices that are physically adjacent and numbered sequentially along the cable laying path. These adjacent detection device numbers are obtained by the system comparing and filtering the detection device numbers according to the adjacency rule, extracting two detection device numbers that meet the adjacency determination criteria. For example, if the detection device numbers are 1, 2, 4, 5, 8, and 9, then the adjacent detection device numbers are 1 and 2, 4 and 5, and 8 and 9.

[0046] Step 22: Form adjacent device number groups based on adjacent detection device numbers and define them as detection device number groups.

[0047] Adjacent device number groups refer to the set of device numbers formed by combining the numbers of adjacent detection devices. The method for forming adjacent device number groups is as follows: the system integrates and groups detection device numbers that conform to the adjacency rules in pairs, and finally combines them into a continuous group of adjacent device numbers, which is then defined as a detection device number group. For example, if the adjacent detection device numbers are 1 and 2, 4 and 5, and 8 and 9, then 1 and 2 form an adjacent device number group, 4 and 5 form an adjacent device number group, and 8 and 9 form an adjacent device number group.

[0048] Step 23: Compare the detection device numbers within the detection device number group to obtain the smaller detection device number.

[0049] The smaller detection device number refers to the unique number of the detection device with the smaller number among two detection device numbers within the same detection device number group. The smaller detection device number is obtained by the system comparing the two detection device numbers within the same group, filtering, and determining the detection device number with the smaller number.

[0050] Step 24: Find the corresponding small-size generating device number based on the small-size detection device number and define it as the generating device number.

[0051] The small-scale generator number refers to a unique number assigned to the generator used to emit DC power, corresponding to the small-scale detection device number. The method for finding the small-scale generator number is as follows: each detection device is equipped with a generator, which is assigned a number by someone skilled in the art and then entered into the system. The system then retrieves the corresponding generator number based on the identified small-scale detection device number.

[0052] The method for finding the corresponding small-size generating device number based on the small-size detection device number and defining it as the generating device number includes: Step 240: Obtain the fault segment number through leakage current data.

[0053] The fault segment number refers to a unique number for a cable segment with insulation faults or leakage abnormalities. The fault segment number is obtained by associating a cable segment between every two adjacent detection or generation devices with the system detection or generation devices at both ends, and then inputting the associated number into the system. When the system receives leakage data, it automatically locates the cable segment to which the fault belongs based on the leakage data uploaded by the detection devices, and then extracts its corresponding number.

[0054] Step 241: Obtain the adjacent fault segment number based on the adjacent rules and the fault segment number.

[0055] The adjacent fault segment number refers to a unique number for cable segments that have insulation faults or leakage abnormalities, are physically adjacent, and have consecutive numbering sequences. The adjacent fault segment number is obtained by the system comparing the fault segment numbers sequentially based on adjacent rules to select the adjacent fault segment numbers.

[0056] Step 242: If the adjacent fault segment number does not exist, find the corresponding small generating device number based on the small detection device number and define it as the generating device number.

[0057] If the adjacent fault segment number does not exist, it means that the fault points are independent and there is no possibility that the detection device will receive two current data at the same time. Therefore, the corresponding small generating device number is found according to the small detection device number and defined as the generating device number.

[0058] Step 243: If adjacent fault segment numbers exist, count the number of adjacent fault segments.

[0059] The number of adjacent fault segments refers to the total number of cable segments that are physically adjacent to the current fault segment and all have insulation faults or leakage abnormalities. This number is calculated by counting the total number of adjacent fault segment numbers after the system has filtered out all adjacent fault segment numbers.

[0060] If adjacent fault segment numbers exist, it means that there is one or more detection devices that need to receive multiple sets of data. In order to avoid data overlap and errors in the subsequent calculation of cable fault point areas, the number of adjacent fault segments is counted.

[0061] Step 244: Obtain the fault detection number based on the adjacent fault segment number and combine them to form a continuous device number group.

[0062] A fault detection number refers to a unique identifier for a distributed detection device located at both ends of an adjacent fault segment, collecting leakage current and current data. This fault detection number is obtained by the system searching for the associated detection device number based on the adjacent fault segment numbers. A continuous device number group refers to a set of detection device numbers composed of multiple fault detection numbers from adjacent fault segments. This continuous device number group is formed by the system arranging and integrating the obtained fault detection numbers according to the physical order of the cable. For example, if the fault segments are numbered 2 and 3, and the corresponding fault detection numbers are 2, 3, and 4, then the continuous device number group is 2, 3, and 4.

[0063] Step 245: Extract the larger detection device number from the continuous device number group.

[0064] The "larger detection device number" refers to the unique number of the detection device with the largest value among all detection device numbers in the continuous device numbering group. The method for extracting the larger detection device number here is that the system compares the numerical values ​​of all detection device numbers within the continuous device numbering group, filters, and extracts the number with the largest value. Essentially, the larger detection device number here is the same as the smaller detection device number described in step 23; here, it is obtained by the system extracting the device number with the largest value from combinations of different detection devices.

[0065] Step 246: When the number of adjacent fault segments is equal to 2, the number of the smaller fault generator is defined as the number of the first fault generator.

[0066] The first generating device number refers to the unique number of the generating device that has priority in emitting DC power.

[0067] When the number of adjacent fault segments is equal to 2, it means that there are 3 detection devices. The middle detection device needs to receive two sets of current data. Therefore, the number of the smaller generating device is defined as the number of the first generating device.

[0068] Step 247: Find the corresponding large-size generating device number through the large-size detection device number and define it as the second generating device number.

[0069] The "large-scale generator number" refers to a unique number assigned to the generator used for transmitting DC power, corresponding to the "large-scale detection device number." The method for finding the large-scale generator number is as follows: each detection device is equipped with a generator, which is assigned a number by someone skilled in the art and entered into the system. The system then retrieves and matches the corresponding generator number based on the identified large-scale detection device number, and defines it as the second generator number. The second generator number is the unique number corresponding to the second generator that performs the DC power transmission operation after the first generator.

[0070] This also includes: Step 248: When the number of adjacent fault segments is greater than 2, find the corresponding large-scale generating device number and small-scale generating device number by using the large-scale detection device number and small-scale detection device number, and define them as the first device number.

[0071] The first device number refers to the unique set of numbers that, together with the large device number and the small device number, are used to initiate the transmission of DC power.

[0072] When the number of adjacent fault segments is greater than 2, it indicates that there are multiple devices that need to receive two sets of current data at once. In order to avoid the positioning deviation caused by the two sets of current data, the corresponding large and small generating device numbers are found by using the large and small detection device numbers and defined as the first device number.

[0073] Step 249: Determine the first fault segment number based on the first device number.

[0074] The initial fault segment number refers to the unique number of the faulty cable segment between the smaller and larger detection devices corresponding to the initial device number. The initial fault segment number is determined by the system based on the location of the detection devices corresponding to the initial device number.

[0075] Step 250: Filter the adjacent fault segment numbers according to the initial fault segment number to update the adjacent fault segment numbers.

[0076] The method for updating the adjacent fault segment numbers here is that the system takes the initial fault segment number as the benchmark, removes the initial fault segment number from the original adjacent fault segment numbers, and uses the remaining fault segment numbers as the updated adjacent fault segment numbers.

[0077] Step 251: Repeat steps 248 to 250 based on the updated adjacent fault segment numbers until the number of adjacent fault segments is equal to 2 or the adjacent fault segment numbers do not exist.

[0078] The system continues to search for new initial device number and initial fault segment number based on the remaining adjacent fault segment numbers, until only two adjacent fault segments or one fault segment remain.

[0079] The methods for obtaining adjacent fault segment numbers based on adjacent rules and fault segment numbers include: Step 2410: Obtain the device number to be tested based on the fault segment number.

[0080] The device number to be tested refers to the unique number of the detection device from which current data will be collected. This device number is obtained by the system retrieving the detection device numbers associated with both ends of the fault segment based on the fault segment number, and then identifying these as the device number for which the current data will be collected.

[0081] Step 2411: Arrange the device numbers to be tested according to the adjacency rule to obtain the order of devices to be tested and count the number of adjacent devices.

[0082] The order of devices to be tested refers to the sequence of device numbers formed by arranging the device numbers in an orderly manner. This order is obtained by the system arranging the device numbers in ascending order of value according to adjacency rules. The number of adjacent devices refers to the total number of consecutive device numbers that satisfy the adjacency rules. This number is calculated by counting the device numbers that meet the adjacency criteria after the order is formed.

[0083] Step 2412: When the number of adjacent devices is greater than 2, determine the verification device number group based on the order of devices to be detected and the preset one-alternate rule.

[0084] The "one-skip rule" refers to a judgment rule in which, starting with the detection device with the smallest number in the sequence of devices to be tested, every other detection device is selected as the verification object. This "one-skip" method is determined by professionals in the field based on numerical values ​​and input into the system. For example, if the minimum value is 3, then according to the "one-skip rule," the first number should be 4. Since there are adjacent numbers, the second number needs to be found; in this case, according to the "one-skip rule," 4 is 4 and the next number is 6. The verification device number group refers to a combination of unique numbers of devices used to verify the existence of multiple consecutive fault segments. The method for determining the verification device number group here is as follows: the system starts with the device with the smallest number in the sequence to be tested, and selects a number for every other device. The selected numbers are combined to form the verification device number group. For example, if devices 1, 2, 3, 4, and 5 all have current data, 1 and 2 correspond to segment 1, 2 and 3 correspond to segment 2, 3 and 4 correspond to segment 3, and 4 and 5 correspond to segment 4. Since devices 1 and 5 have current, segments 1 and 4 must have faults. At this time, the current of devices 2 and 4 may be the leakage current provided by segments 1 and 4. Therefore, only one segment in segments 2 and 3 may have a fault. At this time, according to the rule of skipping one, the next number of the smallest device is obtained, which is the generating device corresponding to device 2. Then, skip one again, which is the next number, to obtain the generating device corresponding to device 4. Combine this with the generating device of device 2 to obtain the verification device number group, and perform a DC power transmission operation to verify whether segments 2 and 3 both have leakage faults.

[0085] When the number of adjacent devices is greater than 2, it indicates that there may be a continuous fault segment, but it is possible that the continuous adjacent devices are caused by a fault segment with one fault. In order to determine whether it is a continuous fault segment or a fault segment with one fault, the verification device number group is determined based on the order of the devices to be detected and the preset rule of one fault.

[0086] Step 2413: Determine the receiving device number group based on the verification device number group.

[0087] The receiving device number group refers to a unique combination of numbers for the detection devices used to receive the DC signals emitted by the verification devices and collect current data. The receiving device number group is determined by the system selecting the corresponding detection device number for each verification device as the receiving object, based on the verification device number group. For example, verification devices 2 and 4 emit DC power. After the DC power is injected into the cable, it will be transmitted bidirectionally along the line until it reaches the fault point. Therefore, detection device 2 corresponding to device 2, as well as detection devices 1 and 3, may receive the DC power. Device 4 corresponds to receiving devices 3, 4, and 5. Therefore, the receiving device number group is detection devices 1, 2, 3, 4, and 5.

[0088] Step 2414: Control the generator corresponding to the verification device number group to perform DC power transmission operation.

[0089] The DC transmission operation here is performed by the system sequentially sending start commands to the generating devices corresponding to the verification device number group, controlling each generating device to inject DC current into the cable. After the DC current is transmitted along the cable to the fault area, the detection device in the receiving device number group collects the corresponding current data.

[0090] Step 2415: When all the detection devices corresponding to the receiving device number group receive current data, determine the fault segment number based on the detection device sorting.

[0091] The fault segment number refers to the unique number corresponding to the cable segment with a leakage fault. The fault segment number is determined by the system based on the current data collected by the receiving device number group, combined with the detection device sequence, to determine whether the cable segment between adjacent detection devices is a fault segment and determine its number.

[0092] When all the detection devices corresponding to the receiving device number group receive current data, it indicates that there is indeed a faulty segment in each adjacent cable segment. Therefore, the faulty segment number is determined based on the sequence of the detection devices.

[0093] Step 2416: Filter the adjacent fault segment numbers according to the adjacent rules to obtain the adjacent fault segment numbers.

[0094] The adjacent fault segment numbers are obtained by the system filtering and aggregating fault segments with consecutive numerical values ​​and adjacent positions from the identified fault segment numbers according to the adjacency rules.

[0095] Among them, when all the detection devices corresponding to the receiving device number group receive current data, the method for determining the fault segment number based on the detection device sorting includes: Step 24150: Extract the smallest number from the verification device number group.

[0096] The minimum ID refers to the device ID with the smallest value among all device IDs included in the verification device ID group. The minimum ID is extracted by the system comparing the values ​​of all IDs within the verification device ID group and selecting the device ID with the smallest value.

[0097] Step 24151: Based on the adjacency rule and the minimum number, find the adjacent minimum device number and define it as the generating device number.

[0098] The smallest adjacent device number refers to the number of the generating device that is numerically consecutive and adjacent to the smallest number in the verification device number group. The method for finding the smallest adjacent device number is as follows: the system uses the smallest number as a reference, searches for the preceding adjacent device number that is smaller in value, and then defines it as the generating device number.

[0099] Step 24152: Perform steps 3 to 4 to obtain fault leakage current data.

[0100] Fault leakage current data refers to the current value information collected by the detection device when current leakage occurs in the fault area. The fault leakage current data is obtained by the system controlling the generator to start according to steps 3 to 4, the detection device collecting and uploading the current signal, and processing it to form the fault leakage current data.

[0101] Step 24153: Define the minimum number as the generating device number and execute steps 3 to 4 to obtain the verification leakage current data.

[0102] The verification leakage current data refers to the leakage current values ​​collected for fault section verification. The verification leakage current data is obtained by setting the smallest number in the verification device number group as the generating device number, performing DC current emission and current acquisition according to steps 3 and 4, and then processing the data to obtain the verification leakage current data.

[0103] Step 24154: When the fault leakage current data is consistent with the verification leakage current data, determine the independent fault segment number based on the fault leakage current data and output it.

[0104] An independent fault segment number refers to a unique number corresponding to a cable segment where no fault exists between two adjacent cable segments. The independent fault segment number is obtained by the system based on the detection device corresponding to the received fault leakage current data and extracting the associated cable segment number. The independent fault segment number is output as a single numerical identifier by the system.

[0105] When the fault leakage current data is consistent with the verification leakage current data, it means that the detection device, which should have received two sets of data, did not receive two sets of data. It only received the current data of the segment corresponding to the normal fault detection. This means that only one of the two cable segments corresponding to the smallest number has a fault. Therefore, the independent fault segment number is determined and output based on the fault leakage current data.

[0106] Step 24155: When the fault leakage current data is inconsistent with the verification leakage current data, determine the fault segment number based on the sorting of the detection device.

[0107] When the fault leakage current data is inconsistent with the verified leakage current data, it indicates that the data from the detection device, which should have received two sets of data, is different from one set. This means that it has received leakage current from two cable segments. Therefore, the fault segment number is determined based on the detection device's sequence.

[0108] This also includes a method for updating the detection device number group, which includes: Step 220: Obtain the damaged device number.

[0109] The damaged device number refers to a unique number corresponding to a detection device that has malfunctioned, is damaged, or is not functioning properly. This damaged device number is obtained by the system filtering out devices that did not collect data correctly or whose signals were abnormal based on the collected leakage current data and signal response status.

[0110] Step 221: Obtain the number of the device to be assembled based on the damaged device number and the detection device number group.

[0111] The device number to be assembled refers to the unique number of the remaining functional testing device in the testing device number group. The device number to be assembled is obtained by removing the numbers of damaged devices from the testing device number group, and using the remaining numbers as the device number to be assembled.

[0112] Step 222: Combine the damaged device number, the device number to be combined, and the adjacent rules to find the adjacent damaged device number.

[0113] The adjacent damaged device number refers to the number of a normal detection device that satisfies the adjacent rule with the damaged device number. The method for finding the adjacent damaged device number here is that the system, based on the damaged device number, excludes the number of the device to be combined, and then finds the adjacent detection device number on the other side.

[0114] Step 223: Replace the damaged device number with the adjacent damaged number and combine it with the device number to be combined to form an updated adjacent number group.

[0115] Updating adjacent number groups refers to the combination of normal detection device numbers that continue to detect cable faults. The method for forming updated adjacent number groups here is to remove the original damaged device number from the system, combine the damaged adjacent number with the device number to be combined, and obtain a group of adjacent detection device numbers that can be used normally.

[0116] The methods for obtaining the damaged device number include: Step 2200: Find the independent detection number based on the detection device number.

[0117] An independent detection number is a unique identifier for a detection device whose adjacent detection devices do not show leakage current data. The method for finding an independent detection number is as follows: the system iterates through the device identifiers, analyzes whether adjacent paired detection devices show leakage current data, and identifies the device whose adjacent detection devices do not show leakage current data as the independent detection number.

[0118] Step 2201: When an independent detection number exists, find the corresponding independent occurrence number based on the independent detection number.

[0119] An independent occurrence number is a unique identifier for a generator that transmits DC current to assist the detection device in performing fault detection, corresponding to the independent detection number. The independent occurrence number is determined by the system matching the generator number associated with the independent detection number.

[0120] When an independent detection number exists, it indicates that the adjacent detection device may be damaged. To further confirm this, the corresponding independent occurrence number is found based on the independent detection number.

[0121] Step 2202: Define the independent generation number as the generation device number and execute steps 3 to 4 to obtain DC data.

[0122] The DC data is obtained by the system setting the independent generation number as the generation device number, controlling the generation device to perform DC transmission operation to the cable, and the corresponding detection device to collect the current signal after the cable transmission, which is then processed to obtain the DC data.

[0123] Step 2203: Determine and output the damaged device number based on the DC current data and the independent detection number combined with the adjacent rules.

[0124] The damaged device number is determined by the system based on the correspondence between DC current data and independent detection numbers, according to the adjacency rule, identifying the adjacent detection devices that failed to acquire current signals normally, and assigning the device number as the damaged device number. The damaged device number is output by the system extracting the determined damaged device number as a separate numerical identifier and outputting it as the fault detection result.

[0125] The methods for obtaining the detection device number based on leakage current data include: Step 200: Obtain environmental parameters.

[0126] Environmental parameters refer to external environmental data such as temperature, humidity, electromagnetic interference, and line load in the cable operating environment that affect fault detection results. These environmental parameters are obtained by the system collecting and summarizing data such as temperature, humidity, electromagnetic interference intensity, and cable load current in the corresponding environment using environmental sensors. For example, a temperature sensor collects ambient temperature data, and a humidity sensor collects ambient humidity data.

[0127] Step 201: Find the corresponding safety data based on the environmental parameters and compare it with the leakage current data.

[0128] Safety data refers to the standard current threshold and reference current data that are allowed when the cable is normal, fault-free, and leak-free under corresponding environmental parameters. The method for finding safety data here is that different environments correspond to different safety data. Personnel in the field obtain the safety data corresponding to most environments through multiple experiments based on the standard safety data under ideal conditions, and then input this data into the system. When the system receives environmental parameters, it automatically retrieves the corresponding safety data. For example, the standard safety data for leakage current under ideal conditions is 0.5mA; when the air humidity increases by 10%, the allowable leakage current increases by 0.5mA.

[0129] Step 202: If the safety data is greater than the leakage data, the leakage data is treated as normal data and output.

[0130] Normal data refers to the actual leakage current data of the cable under the current environmental parameters, indicating a fault-free and normally operating state. The normal data is output as follows: the system marks the leakage current data as normal and outputs it along with the corresponding detection number and environmental parameters as the detection result.

[0131] If the safety data is greater than the leakage data, it means that this is just a small current leaking out during normal current transmission in the cable, which will not affect safety. Therefore, the leakage data is taken as normal data and output.

[0132] Step 203: If the safety data is less than the leakage data, obtain the detection device number corresponding to the leakage data.

[0133] The detection device number is obtained by the system screening current acquisition and detection devices whose leakage current data exceeds the safe data, and extracting their numbers as the detection device number.

[0134] If the safety data is less than the leakage data, it indicates that there is a fault in that section of cable causing leakage. Therefore, the detection device number corresponding to the leakage data is obtained.

[0135] Based on the same inventive concept, embodiments of the present invention provide a cable fault location system based on distributed signal detection.

[0136] One example is a cable fault location system based on distributed signal detection, comprising: The acquisition module is used to acquire leakage current data and environmental parameters; A memory for storing a program for a cable fault location method based on distributed signal detection; The processor loads and executes programs from memory.

[0137] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0138] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A cable fault location method based on distributed signal detection, characterized in that, include: Step 1: In response to a preset detection signal, acquire leakage current data; Step 2: Determine the detection device number group and the generating device number based on the leakage current data; Step 3: Control the generator corresponding to the generator number to perform DC power transmission operation; Step 4: Obtain current data through the detection device corresponding to the detection device number group; Step 5: Compare the obtained current data to obtain the current data ratio; Step 6: Determine the cable fault area by comparing the current data with the preset cable segment length and output the result.

2. The cable fault location method based on distributed signal detection according to claim 1, characterized in that, The methods for determining the detection device number group and the generating device number based on leakage current data include: Step 20: Obtain the detection device number based on the leakage current data; Step 21: Filter the detection device numbers based on preset adjacency rules to obtain adjacent detection device numbers; Step 22: Form adjacent device number groups based on adjacent detection device numbers and define them as detection device number groups; Step 23: Compare the detection device numbers within the detection device number group to obtain the smaller detection device number; Step 24: Find the corresponding small-size generating device number based on the small-size detection device number and define it as the generating device number.

3. The cable fault location method based on distributed signal detection according to claim 2, characterized in that, The methods for finding the corresponding small-sized generating device number based on the small-sized detection device number and defining it as the generating device number include: Step 240: Obtain the fault segment number through leakage current data; Step 241: Obtain the adjacent fault segment numbers based on the adjacent rules and fault segment numbers; Step 242: If the adjacent fault segment number does not exist, find the corresponding small generating device number based on the small detection device number and define it as the generating device number; Step 243: If adjacent fault segment numbers exist, count the number of adjacent fault segments; Step 244: Obtain fault detection numbers based on adjacent fault segment numbers and combine them to form continuous device number groups; Step 245: Extract the large-size detection device number and the small-size detection device number from the continuous device number group; Step 246: When the number of adjacent fault segments is equal to 2, define the number of the smaller fault generator as the number of the first fault generator; Step 247: Find the corresponding large-size generating device number through the large-size detection device number and define it as the second generating device number.

4. The cable fault location method based on distributed signal detection according to claim 3, characterized in that, Also includes: Step 248: When the number of adjacent fault segments is greater than 2, find the corresponding large-scale generating device number and small-scale generating device number by using the large-scale detection device number and small-scale detection device number, and define them as the first device number; Step 249: Determine the initial fault segment number based on the initial device number; Step 250: Filter the adjacent fault segment numbers according to the initial fault segment number to update the adjacent fault segment numbers; Step 251: Repeat steps 248 to 250 based on the updated adjacent fault segment numbers until the number of adjacent fault segments is equal to 2 or the adjacent fault segment numbers do not exist.

5. The cable fault location method based on distributed signal detection according to claim 3, characterized in that, Methods for obtaining adjacent fault segment numbers based on adjacent rules and fault segment numbers include: Step 2410: Obtain the device number to be tested based on the fault segment number; Step 2411: Arrange the device numbers to be tested according to the adjacency rule to obtain the order of devices to be tested and count the number of adjacent devices; Step 2412: When the number of adjacent devices is greater than 2, determine the verification device number group based on the order of devices to be detected and the preset one-alternate rule; Step 2413: Determine the receiving device number group based on the verification device number group; Step 2414: Control the generator corresponding to the verification device number group to perform DC power transmission operation; Step 2415: When all the detection devices corresponding to the receiving device number group have received current data, determine the fault segment number based on the detection device sorting. Step 2416: Filter the adjacent fault segment numbers according to the adjacent rules to obtain the adjacent fault segment numbers.

6. The cable fault location method based on distributed signal detection according to claim 5, characterized in that, When all the detection devices corresponding to the receiving device number group receive current data, the method for determining the fault segment number based on the detection device sequence includes: Step 24150: Extract the smallest number from the verification device number group; Step 24151: Based on the adjacency rule and the minimum number, find the adjacent minimum device number and define it as the generating device number; Step 24152: Perform steps 3 to 4 to obtain fault leakage current data; Step 24153: Define the minimum number as the generating device number and execute steps 3 to 4 to obtain the verification leakage current data; Step 24154: When the fault leakage current data is consistent with the verification leakage current data, determine the independent fault segment number based on the fault leakage current data and output it. Step 24155: When the fault leakage current data is inconsistent with the verification leakage current data, determine the fault segment number based on the sorting of the detection device.

7. The cable fault location method based on distributed signal detection according to claim 2, characterized in that, It also includes a method for updating the detection device number group, the method comprising: Step 220: Obtain the damaged device number; Step 221: Obtain the number of the device to be assembled based on the damaged device number and the detection device number group; Step 222: Combine the damaged device number, the device number to be assembled, and the adjacent number rule to find the adjacent damaged device number; Step 223: Replace the damaged device number with the adjacent damaged number and combine it with the device number to be combined to form an updated adjacent number group.

8. The cable fault location method based on distributed signal detection according to claim 7, characterized in that, Methods for obtaining the damaged device number include: Step 2200: Locate the unique detection number based on the detection device number; Step 2201: If an independent detection number exists, find the corresponding independent occurrence number based on the independent detection number; Step 2202: Define the independent generation number as the generation device number and execute steps 3 to 4 to obtain DC data; Step 2203: Determine and output the damaged device number based on the DC current data and the independent detection number combined with the adjacent rules.

9. A cable fault location method based on distributed signal detection according to claim 2, characterized in that, Methods for obtaining the detection device number based on leakage current data include: Step 200: Obtain environmental parameters; Step 201: Find the corresponding safety data based on the environmental parameters and compare it with the leakage current data; Step 202: If the safety data is greater than the leakage data, the leakage data is treated as normal data and output. Step 203: If the safety data is less than the leakage data, obtain the detection device number corresponding to the leakage data.

10. A cable fault location system based on distributed signal detection, characterized in that, include: The acquisition module is used to acquire leakage current data and environmental parameters; A memory for storing a program of a cable fault location method based on distributed signal detection as described in any one of claims 1 to 9; The processor loads and executes programs from memory.

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