Aerial cable fault detection system based on wireless sensor

Abstract

The invention relates to the technical field of overhead cable fault detection, and particularly discloses an overhead cable fault detection system based on a wireless sensor, which comprises an insulation detection module, a load detection module, an electrical detection module, a fault analysis module, a fault processing terminal and a system storage library. By detecting and analyzing the current and the voltage of each detection point of each aerial cable in the target area corresponding to each detection time point in the current detection period, more accurate and stable electrical parameters can be obtained, errors caused by instantaneous fluctuation are reduced, the electrical state of the cable is judged more accurately, and the detection accuracy of the cable is improved. And the electrical evaluation index of each aerial cable in the target area corresponding to the current detection time period is analyzed, so that the potential electrical instability problem can be found, short-circuit faults can be found and processed in time, the timeliness of fault detection response and the reliability of power supply can be improved, and the continuous demand of users on power can be met.

Description

Technical Field

[0001] The invention relates to the technical field of overhead cable fault detection, in particular to an overhead cable fault detection system based on wireless sensors. Background Art

[0002] In the power system, overhead cables are important channels for power transmission, and their safety and reliability are directly related to the stable operation of the power grid and the quality of power supply. However, due to environmental factors (such as weather changes, external force damage, etc.) and the aging of overhead cables themselves, overhead cables often have various faults, which not only cause power outages, but may also cause serious consequences such as fires. Therefore, real-time monitoring and fault detection of overhead cables are of great significance.

[0003] Traditional overhead cable fault detection and analysis is usually carried out through manual inspections and regular testing, which requires a lot of manpower, material resources and time, and it is difficult to achieve real-time monitoring. In addition, the results of manual inspections are often affected by the experience and subjective judgment of the inspectors, and there are errors and omissions. They can often only find that the cable has a fault, but it is difficult to accurately locate the fault type and fault point. This not only brings difficulties to the maintenance of overhead cable faults, but also prolongs the maintenance time, and even seriously affects the power supply stability of users. Summary of the invention

[0004] The object of the present invention is to provide an overhead cable fault detection system based on wireless sensors to solve the above-mentioned background problems.

[0005] The purpose of the present invention can be achieved by the following technical solution: an overhead cable fault detection system based on a wireless sensor, comprising:

[0006] The insulation detection module is used to detect the insulation parameters of each overhead cable in the target area corresponding to the current detection period, obtain the insulation parameters of each overhead cable in the target area corresponding to the current detection period, and analyze the insulation evaluation index of each overhead cable in the target area corresponding to the current detection period to obtain the insulation evaluation index of each overhead cable in the target area corresponding to the current detection period;

[0007] A load detection module is used to detect the load parameters of each overhead cable in the target area corresponding to the current detection period, obtain the load parameters of each overhead cable in the target area corresponding to the current detection period, and thereby analyze the load evaluation index of each overhead cable in the target area corresponding to the current detection period, and obtain the load evaluation index of each overhead cable in the target area corresponding to the current detection period;

[0008] An electrical detection module is used to detect the electrical parameters of each overhead cable in the target area corresponding to the current detection period, obtain the electrical parameters of each overhead cable in the target area corresponding to the current detection period, and thereby analyze the electrical evaluation index of each overhead cable in the target area corresponding to the current detection period, and obtain the electrical evaluation index of each overhead cable in the target area corresponding to the current detection period;

[0009] A fault analysis module is used to analyze the fault type of each overhead cable corresponding to the target area based on the insulation evaluation index, load evaluation index, and electrical evaluation index of each overhead cable corresponding to the target area, obtain the fault type of each overhead cable corresponding to the target area, and send it to the fault processing terminal;

[0010] The fault processing terminal is used to receive the fault type of each overhead cable in the target area, and perform corresponding processing based on the fault type of each overhead cable in the target area.

[0011] Preferably, the insulation parameters of each overhead cable in the target area corresponding to the current detection period are detected, and the specific detection method is:

[0012] The insulation layer images of each overhead cable in the target area corresponding to the current detection period are collected by the intelligent camera to obtain the insulation layer images of each overhead cable in the target area corresponding to the current detection period;

[0013] Identify each abnormal area from the insulation layer image of each overhead cable in the target area corresponding to the current detection period, and extract the insulation layer image of each abnormal area in the current detection period of each overhead cable in the target area from the insulation layer image of each overhead cable in the target area corresponding to the current detection period;

[0014] Match the insulation layer images of each abnormal area in the current detection period corresponding to each overhead cable in the target area with the insulation layer images of the area corresponding to each abnormal type, and obtain the abnormal type of each abnormal area in the current detection period corresponding to each overhead cable in the target area, wherein the abnormal type is specifically a detachment type, a fracture type, and a damage type, and classify each abnormal area in the current detection period corresponding to each overhead cable in the target area based on the abnormal type of each abnormal area in the current detection period corresponding to each overhead cable in the target area, and obtain each detachment area, each fracture area, and each damage area in the current detection period corresponding to each overhead cable in the target area;

[0015] Extract the detached area of ​​each detached area, the fractured area of ​​each fractured area, and the damaged area of ​​each damaged area of ​​each overhead cable in the target area corresponding to the current detection period from the insulation layer images of each abnormal area in the current detection period corresponding to each overhead cable in the target area;

[0016] The dropped areas of each overhead cable in the target area corresponding to the current detection period are accumulated to obtain the total dropped area of ​​each overhead cable in the target area corresponding to the current detection period, and the number of dropped areas of each overhead cable in the target area corresponding to the current detection period is counted;

[0017] The falling areas of each fractured area of ​​each overhead cable in the target area corresponding to the current detection period are accumulated to obtain the total area of ​​the fractured area of ​​each overhead cable in the target area corresponding to the current detection period, and the number of fractured areas of each overhead cable in the target area corresponding to the current detection period is counted;

[0018] Accumulate the damaged areas of each detached area of ​​each overhead cable in the target area corresponding to the current detection period to obtain the total area of ​​the damaged area of ​​each overhead cable in the target area corresponding to the current detection period, and count the number of damaged areas of each overhead cable in the target area corresponding to the current detection period;

[0019] The insulation parameters of each overhead cable in the target area corresponding to the current detection period are composed of the total area of ​​the detached areas, the total area of ​​the broken areas, the total area of ​​the damaged areas, the number of detached areas, the number of broken areas and the number of damaged areas of each overhead cable in the target area corresponding to the current detection period.

[0020] Preferably, the insulation evaluation index of each overhead cable in the target area corresponding to the current detection period is analyzed, and the specific analysis method is:

[0021] The total area of ​​the falling area, the total area of ​​the broken area, and the total area of ​​the damaged area of ​​each overhead cable in the target area corresponding to the current detection period are extracted from the insulation parameters of each overhead cable in the target area corresponding to the current detection period, and they are normalized and their values ​​are taken, which are recorded as TS i DS i ,PS i , extract the number of falling areas, broken areas, and damaged areas of each overhead cable in the target area corresponding to the current detection period, normalize them and take their values, which are recorded as TN i DN i PN i , i represents the number of each overhead cable, i=1,2,....,m, m represents the total number of overhead cable numbers;

[0022] According to the formula Calculate the insulation evaluation index JY of each overhead cable in the target area corresponding to the current detection period i , a1, a2, a3, a4, a5, and a6 represent the set weight factors respectively.

[0023] Preferably, the load parameters of each overhead cable in the target area corresponding to the current detection period are detected, and the specific detection method is:

[0024] Arrange detection points of each overhead cable in the target area in a uniformly set manner to obtain detection points of each overhead cable in the target area, detect the temperature of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period by a temperature sensor, obtain the temperature of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period, and form a temperature data set of each overhead cable in the target area corresponding to the current detection period;

[0025] The voltage at both ends of each overhead cable in the target area corresponding to each detection time point in the current detection period is collected by a voltage sensor to obtain the voltage at both ends of each overhead cable in the target area corresponding to each detection time point in the current detection period, and a difference calculation is performed to obtain the voltage drop of each overhead cable in the target area corresponding to each detection time point in the current detection period, thereby forming a voltage drop data set of each overhead cable in the target area corresponding to the current detection period;

[0026] The atmospheric temperature of each overhead cable in the target area at each detection time point in the current detection period is collected by a temperature sensor to obtain the atmospheric temperature of each overhead cable in the target area at each detection time point in the current detection period, and the average value is calculated to obtain the atmospheric temperature of each overhead cable in the target area at the current detection period;

[0027] The atmospheric humidity of each overhead cable in the target area at each detection time point in the current detection period is collected by a humidity sensor to obtain the atmospheric humidity of each overhead cable in the target area at each detection time point in the current detection period, and the average value is calculated to obtain the atmospheric humidity of each overhead cable in the target area at the current detection period;

[0028] The wind speed of each overhead cable in the target area at each detection time point in the current detection period is collected by a wind speed sensor to obtain the wind speed of each overhead cable in the target area at each detection time point in the current detection period, and the average is calculated to obtain the wind speed of each overhead cable in the target area at the current detection period;

[0029] This constitutes a set of environmental data corresponding to the current detection period for each overhead cable in the target area;

[0030] The load parameters of each overhead cable in the target area are constituted by the temperature data set, voltage drop data set and environmental data set of each overhead cable in the target area corresponding to the current detection period.

[0031] Preferably, the load evaluation index of each overhead cable in the target area corresponding to the current detection period is analyzed, and the specific analysis method is:

[0032] A temperature data set corresponding to the current detection period of each overhead cable in the target area is obtained from the load parameters of each overhead cable in the target area, and the temperature of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period is extracted from the temperature data set corresponding to the current detection period of each overhead cable in the target area, and the temperatures of each detection time point in the temperatures of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period are arranged in order from large to small to obtain a temperature sequence of each detection point of each overhead cable in the target area corresponding to the current detection period, and the values ​​of the maximum temperature, the minimum temperature, the median temperature, and the mode temperature are extracted therefrom;

[0033] Obtain the environmental data set of each overhead cable in the target area corresponding to the current detection period from the load parameters of each overhead cable in the target area, and extract the atmospheric temperature, atmospheric humidity, and wind speed of each overhead cable in the target area corresponding to the current detection period, and obtain the environmental impact coefficient of each overhead cable in the target area corresponding to the current detection period through analysis;

[0034] Matching the environmental impact coefficient of each overhead cable in the target area corresponding to the current detection period with the reference overhead cable temperature corresponding to each set environmental impact coefficient to obtain the reference overhead cable temperature of each overhead cable in the target area corresponding to the current detection period;

[0035] The temperature uniformity index of each detection point of each overhead cable in the target area corresponding to the current detection period is calculated by the formula j represents the number of each detection point, j = 1, 2, ...., n, n represents the total number of detection point numbers;

[0036] Arrange the temperatures of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period in order from large to small, and obtain the temperature sequence of each overhead cable in the target area corresponding to each detection time point in the current detection period, and extract the values ​​of the maximum temperature, minimum temperature, median temperature, and mode temperature from them, and calculate the temperature uniformity index of each overhead cable in the target area corresponding to each detection time point in the current detection period by the formula f represents the number of each detection time point, f = 1, 2, ...., g, g represents the total number of detection time point numbers;

[0037] According to the formula Calculate the temperature stability evaluation index WW of each overhead cable in the target area corresponding to the current detection period i , b9 and b10 represent the set proportional factors respectively;

[0038] The voltage drop data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the voltage drop of each overhead cable in the target area corresponding to each detection time point in the current detection period is extracted from the voltage drop data set of each overhead cable in the target area corresponding to the current detection period, which is recorded as

[0039] The specification information of each overhead cable in the target area is extracted from the specification information of each overhead cable in the target area stored in the system repository, and matched with the rated voltage corresponding to each set specification information to obtain the rated voltage of each overhead cable in the target area, which is recorded as

[0040] According to the formula Calculate the voltage drop load factor YX of each overhead cable in the target area corresponding to the current detection period i , L i It is expressed as the length of each overhead cable in the target area;

[0041] According to the formula Calculate the load evaluation index FZ of each overhead cable in the target area corresponding to the current detection period i , w1 and w2 represent the set influence factors respectively.

[0042] Preferably, the electrical parameters of each overhead cable in the target area corresponding to the current detection period are detected, and the specific analysis method is as follows:

[0043] The current at each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period is detected by a wireless current sensor to obtain the current at each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period, and the average current is calculated to obtain the average current of each overhead cable in the target area corresponding to each detection time point in the current detection period as the current of each overhead cable in the target area corresponding to each detection time point in the current detection period, thereby forming a current data set of each overhead cable in the target area corresponding to the current detection period;

[0044] The voltage of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period is detected by a voltage sensor to obtain the voltage of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period, and the average value is calculated to obtain the average voltage of each overhead cable in the target area corresponding to each detection time point in the current detection period as the voltage of each overhead cable in the target area corresponding to each detection time point in the current detection period, thereby forming a voltage data set of each overhead cable in the target area corresponding to the current detection period;

[0045] The electrical parameters of each overhead cable in the target area corresponding to the current detection period are constituted by the current data set and the voltage data set of each overhead cable in the target area.

[0046] Preferably, the electrical evaluation index of each overhead cable in the target area corresponding to the current detection period is analyzed, and the specific analysis method is:

[0047] The current data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the maximum current and minimum current are extracted from them, which are recorded as

[0048] According to the formula Calculate the current stability evaluation index LW of each overhead cable in the target area corresponding to the current detection period i , It is represented as the current of the ith overhead cable corresponding to the fth detection time point in the current detection period, ΔI is represented as the set allowable current difference, and d1, d2, and d3 are represented as the set weight factors respectively;

[0049] The voltage data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the maximum voltage and minimum voltage are extracted from them, which are recorded as

[0050] According to the formula Calculate the voltage stability assessment index YW of each overhead cable in the target area corresponding to the current detection period i , It is represented as the voltage of the i-th overhead cable corresponding to the f-th detection time point in the current detection period, ΔU is represented as the set allowable voltage difference, and d4, d5, and d6 are represented as the set weight factors respectively;

[0051] According to the formula DP i =LW i ×d7+YW i ×d8 Calculate the electrical evaluation index DP of each overhead cable in the target area corresponding to the current detection period i , d7 and d8 represent the set influence factors respectively.

[0052] Preferably, the fault type of each overhead cable corresponding to the target area is analyzed based on the insulation evaluation index, load evaluation index, and electrical evaluation index of each overhead cable corresponding to the target area. The specific analysis method is as follows:

[0053] The insulation evaluation index of each overhead cable in the target area corresponding to the current detection period is compared with the set insulation evaluation index threshold. If the insulation evaluation index of an overhead cable in the target area corresponding to the current detection period is less than the set insulation evaluation index threshold, it is determined that the fault type of the overhead cable in the target area corresponding to the current detection period is the insulation damage type;

[0054] Compare the load assessment index of each overhead cable in the target area corresponding to the current detection period with the set load assessment index threshold. If the load assessment index of a certain overhead cable in the target area corresponding to the current detection period is greater than the set load assessment index threshold, then determine that the fault type of the overhead cable in the target area corresponding to the current detection period is an overload type;

[0055] The electrical evaluation index of each overhead cable corresponding to the target area is compared with the set electrical evaluation index threshold. If the electrical evaluation index of an overhead cable corresponding to the target area is less than the set electrical evaluation index threshold, the fault type of the overhead cable corresponding to the target area is determined to be a short circuit type.

[0056] Beneficial effects of the present invention:

[0057] 1. By testing the insulation parameters of each overhead cable in the target area corresponding to the current detection period, and analyzing the insulation evaluation index of each overhead cable in the target area corresponding to the current detection period, it provides strong data support for the subsequent fault type evaluation of each overhead cable in the target area to a certain extent, while reducing the errors caused by manual intervention and subjective judgment, and effectively improving the detection efficiency and accuracy.

[0058] 2. Through in-depth analysis of the temperature data and voltage drop data of each overhead cable in the target area corresponding to the current detection period, the load balance and stability of the overhead cables can be accurately evaluated, which helps to discover potential overload problems in advance. The load assessment index is further analyzed through environmental factors and overhead cable specification factors, making the load assessment more in line with the actual operating conditions, avoiding misjudgment based solely on cable temperature, and effectively improving the reliability and authenticity of the test results.

[0059] 3. By detecting and analyzing the current and voltage at each detection point in the current detection period of each overhead cable in the target area, more accurate and stable electrical parameters can be obtained, reducing errors caused by instantaneous fluctuations, so as to more accurately judge the electrical state of the cable. The electrical evaluation index of each overhead cable in the target area corresponding to the current detection period is analyzed, which helps to discover potential electrical instability problems, promptly discover and handle short-circuit faults, improve the timeliness of fault detection response and the reliability of power supply, and meet users' continuous demand for electricity.

[0060] 4. Display corresponding prompt information according to the fault type of each overhead cable in the target area, which can accurately determine the fault type of the overhead cables in the target area, help technicians quickly locate the problem and take corresponding measures, thereby effectively improving the efficiency of fault handling. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The present invention will be further described below in conjunction with the accompanying drawings.

[0062] Figure 1 It is a system block diagram of the present invention. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] See also Figure 1 As shown, the present invention is an overhead cable fault detection system based on wireless sensors, comprising: an insulation detection module, a load detection module, an electrical detection module, a fault analysis module, a fault processing terminal and a system storage library.

[0065] Among them, the insulation detection module is connected to the fault analysis module, the load detection module is connected to the fault analysis module and the system storage library respectively, the electrical detection module is connected to the fault analysis module, and the fault analysis module is connected to the fault processing terminal.

[0066] The insulation detection module is used to detect the insulation parameters of each overhead cable in the target area corresponding to the current detection period, and obtain the insulation parameters of each overhead cable in the target area corresponding to the current detection period. The specific detection method is:

[0067] The insulation layer images of each overhead cable in the target area corresponding to the current detection period are collected by the intelligent camera to obtain the insulation layer images of each overhead cable in the target area corresponding to the current detection period;

[0068] Identify each abnormal area from the insulation layer image of each overhead cable in the target area corresponding to the current detection period, and extract the insulation layer image of each abnormal area in the current detection period of each overhead cable in the target area from the insulation layer image of each overhead cable in the target area corresponding to the current detection period;

[0069] Match the insulation layer images of each abnormal area in the current detection period corresponding to each overhead cable in the target area with the insulation layer images of the area corresponding to each abnormal type, and obtain the abnormal type of each abnormal area in the current detection period corresponding to each overhead cable in the target area, wherein the abnormal type is specifically a detachment type, a fracture type, and a damage type, and classify each abnormal area in the current detection period corresponding to each overhead cable in the target area based on the abnormal type of each abnormal area in the current detection period corresponding to each overhead cable in the target area, and obtain each detachment area, each fracture area, and each damage area in the current detection period corresponding to each overhead cable in the target area;

[0070] Extract the detached area of ​​each detached area, the fractured area of ​​each fractured area, and the damaged area of ​​each damaged area of ​​each overhead cable in the target area corresponding to the current detection period from the insulation layer images of each abnormal area in the current detection period corresponding to each overhead cable in the target area;

[0071] The dropped areas of each overhead cable in the target area corresponding to the current detection period are accumulated to obtain the total dropped area of ​​each overhead cable in the target area corresponding to the current detection period, and the number of dropped areas of each overhead cable in the target area corresponding to the current detection period is counted;

[0072] The falling areas of each fractured area of ​​each overhead cable in the target area corresponding to the current detection period are accumulated to obtain the total area of ​​the fractured area of ​​each overhead cable in the target area corresponding to the current detection period, and the number of fractured areas of each overhead cable in the target area corresponding to the current detection period is counted;

[0073] Accumulate the damaged areas of each detached area of ​​each overhead cable in the target area corresponding to the current detection period to obtain the total area of ​​the damaged area of ​​each overhead cable in the target area corresponding to the current detection period, and count the number of damaged areas of each overhead cable in the target area corresponding to the current detection period;

[0074] The insulation parameters of each overhead cable in the target area corresponding to the current detection period are composed of the total area of ​​the detached areas, the total area of ​​the broken areas, the total area of ​​the damaged areas, the number of detached areas, the number of broken areas and the number of damaged areas of each overhead cable in the target area corresponding to the current detection period.

[0075] The insulation evaluation index of each overhead cable in the target area corresponding to the current detection period is analyzed to obtain the insulation evaluation index of each overhead cable in the target area corresponding to the current detection period. The specific analysis method is as follows:

[0076] The total area of ​​the falling area, the total area of ​​the broken area, and the total area of ​​the damaged area of ​​each overhead cable in the target area corresponding to the current detection period are extracted from the insulation parameters of each overhead cable in the target area corresponding to the current detection period, and they are normalized and their values ​​are taken, which are recorded as TS i DSi ,PS i , extract the number of falling areas, broken areas, and damaged areas of each overhead cable in the target area corresponding to the current detection period, normalize them and take their values, which are recorded as TN i DN i PN i , i represents the number of each overhead cable, i=1,2,....,m, m represents the total number of overhead cable numbers;

[0077] According to the formula Calculate the insulation evaluation index JY of each overhead cable in the target area corresponding to the current detection period i , a1, a2, a3, a4, a5, and a6 represent the set weight factors respectively.

[0078] In a specific embodiment, the present invention detects the insulation parameters of each overhead cable in the target area corresponding to the current detection period, and thereby analyzes the insulation evaluation index of each overhead cable in the target area corresponding to the current detection period, which to a certain extent provides strong data support for the subsequent fault type evaluation of each overhead cable in the target area, while reducing the errors caused by human intervention and subjective judgment, and effectively improving the detection efficiency and accuracy.

[0079] The load detection module is used to detect the load parameters of each overhead cable in the target area corresponding to the current detection period, and obtain the load parameters of each overhead cable in the target area corresponding to the current detection period. The specific detection method is:

[0080] Arrange detection points of each overhead cable in the target area in a uniformly set manner to obtain detection points of each overhead cable in the target area, detect the temperature of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period by a temperature sensor, obtain the temperature of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period, and form a temperature data set of each overhead cable in the target area corresponding to the current detection period;

[0081] The voltage at both ends of each overhead cable in the target area corresponding to each detection time point in the current detection period is collected by a voltage sensor to obtain the voltage at both ends of each overhead cable in the target area corresponding to each detection time point in the current detection period, and a difference calculation is performed to obtain the voltage drop of each overhead cable in the target area corresponding to each detection time point in the current detection period, thereby forming a voltage drop data set of each overhead cable in the target area corresponding to the current detection period;

[0082] The atmospheric temperature of each overhead cable in the target area at each detection time point in the current detection period is collected by a temperature sensor to obtain the atmospheric temperature of each overhead cable in the target area at each detection time point in the current detection period, and the average value is calculated to obtain the atmospheric temperature of each overhead cable in the target area at the current detection period;

[0083] The atmospheric humidity of each overhead cable in the target area at each detection time point in the current detection period is collected by a humidity sensor to obtain the atmospheric humidity of each overhead cable in the target area at each detection time point in the current detection period, and the average value is calculated to obtain the atmospheric humidity of each overhead cable in the target area at the current detection period;

[0084] The wind speed of each overhead cable in the target area at each detection time point in the current detection period is collected by a wind speed sensor to obtain the wind speed of each overhead cable in the target area at each detection time point in the current detection period, and the average is calculated to obtain the wind speed of each overhead cable in the target area at the current detection period;

[0085] This constitutes a set of environmental data corresponding to the current detection period for each overhead cable in the target area;

[0086] The load parameters of each overhead cable in the target area are constituted by the temperature data set, voltage drop data set and environmental data set of each overhead cable in the target area corresponding to the current detection period.

[0087] The load assessment index of each overhead cable in the target area corresponding to the current detection period is analyzed to obtain the load assessment index of each overhead cable in the target area corresponding to the current detection period. The specific analysis method is as follows:

[0088] The temperature data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the temperature of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period is extracted from the temperature data set of each overhead cable in the target area corresponding to the current detection period. The temperatures of each detection time point in the temperatures of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period are arranged in order from large to small to obtain the temperature sequence of each detection point of each overhead cable in the target area corresponding to the current detection period, and the maximum temperature, minimum temperature, median temperature, and mode temperature are extracted from them, which are recorded as j represents the number of each detection point, j = 1, 2, ...., n, n represents the total number of detection point numbers;

[0089] The environmental data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the atmospheric temperature, atmospheric humidity, and wind speed of each overhead cable in the target area corresponding to the current detection period are extracted from it, which are recorded as wd i 、sd i 、fv i , according to the formula HY i =wd i *c1+sd i *c2+fv i *c3 Calculate the environmental impact coefficient HY of each overhead cable in the target area corresponding to the current detection period i , c1, c2, c3 represent the set weight factors respectively;

[0090] The environmental impact coefficient of each overhead cable in the target area corresponding to the current detection period is matched with the reference overhead cable temperature corresponding to each set environmental impact coefficient, and the reference overhead cable temperature of each overhead cable in the target area corresponding to the current detection period is obtained, which is recorded as WD i ';

[0091] The temperature uniformity index of each detection point of each overhead cable in the target area corresponding to the current detection period is calculated by the formula

[0092]

[0093] represents the set reference temperature, b1, b2, b3, and b4 represent the set influence factors respectively;

[0094] Arrange the temperatures of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period in order from large to small, and obtain the temperature sequence of each detection time point of each overhead cable in the target area corresponding to the current detection period, and extract the values ​​of the maximum temperature, minimum temperature, median temperature, and mode temperature from them, which are recorded as f represents the number of each detection time point, f = 1, 2, ...., g, g represents the total number of detection time point numbers;

[0095] The temperature uniformity index of each overhead cable in the target area corresponding to each detection time point in the current detection period is calculated by the formula

[0096]

[0097] b5, b6, b7, and b8 represent the set impact factors respectively;

[0098] According to the formula Calculate the temperature stability evaluation index WW of each overhead cable in the target area corresponding to the current detection period i , b9 and b10 represent the set proportional factors respectively;

[0099] The voltage drop data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the voltage drop of each overhead cable in the target area corresponding to each detection time point in the current detection period is extracted from the voltage drop data set of each overhead cable in the target area corresponding to the current detection period, which is recorded as

[0100] The specification information of each overhead cable in the target area is extracted from the specification information of each overhead cable in the target area stored in the system repository, and matched with the rated voltage corresponding to each set specification information to obtain the rated voltage of each overhead cable in the target area, which is recorded as

[0101] It should be noted that the specification information specifically includes model, cross-sectional area, material and length;

[0102] According to the formula Calculate the voltage drop load factor YX of each overhead cable in the target area corresponding to the current detection period i , L i It is expressed as the length of each overhead cable in the target area;

[0103] According to the formula Calculate the load evaluation index FZ of each overhead cable in the target area corresponding to the current detection period i , w1 and w2 represent the set influence factors respectively.

[0104] In a specific embodiment, the present invention can accurately evaluate the load balance and stability of the overhead cables by conducting in-depth analysis of the temperature data and voltage drop data of each overhead cable in the target area corresponding to the current detection period, which helps to discover potential overload problems in advance, and further analyze the load assessment index through environmental influencing factors and overhead cable specification influencing factors, so that the load assessment is more in line with the actual operating conditions, avoiding misjudgment based solely on cable temperature, and effectively improving the reliability and authenticity of the detection results.

[0105] The electrical detection module is used to detect the electrical parameters of each overhead cable in the target area corresponding to the current detection period, obtain the electrical parameters of each overhead cable in the target area corresponding to the current detection period, and analyze the electrical evaluation index of each overhead cable in the area corresponding to the current detection period to obtain the electrical evaluation index of each overhead cable in the target area corresponding to the current detection period;

[0106] Preferably, the electrical parameters of each overhead cable in the target area corresponding to the current detection period are detected to obtain the electrical parameters of each overhead cable in the target area corresponding to the current detection period. The specific analysis method is:

[0107] The current at each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period is detected by a wireless current sensor to obtain the current at each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period, and the average current is calculated to obtain the average current of each overhead cable in the target area corresponding to each detection time point in the current detection period as the current of each overhead cable in the target area corresponding to each detection time point in the current detection period, thereby forming a current data set of each overhead cable in the target area corresponding to the current detection period;

[0108] The voltage of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period is detected by a voltage sensor to obtain the voltage of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period, and the average value is calculated to obtain the average voltage of each overhead cable in the target area corresponding to each detection time point in the current detection period as the voltage of each overhead cable in the target area corresponding to each detection time point in the current detection period, thereby forming a voltage data set of each overhead cable in the target area corresponding to the current detection period;

[0109] The electrical parameters of each overhead cable in the target area corresponding to the current detection period are constituted by the current data set and the voltage data set of each overhead cable in the target area.

[0110] Preferably, the electrical evaluation index of each overhead cable in the region corresponding to the current detection period is analyzed to obtain the electrical evaluation index of each overhead cable in the target region corresponding to the current detection period. The specific analysis method is:

[0111] The current data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the maximum current and minimum current are extracted from them, which are recorded as

[0112] According to the formula Calculate the current stability evaluation index LW of each overhead cable in the target area corresponding to the current detection period i , It is represented as the current of the ith overhead cable corresponding to the fth detection time point in the current detection period, ΔI is represented as the set allowable current difference, and d1, d2, and d3 are represented as the set weight factors respectively;

[0113] The voltage data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the maximum voltage and minimum voltage are extracted from them, which are recorded as

[0114] According to the formula Calculate the voltage stability assessment index YW of each overhead cable in the target area corresponding to the current detection period i , It is represented as the voltage of the i-th overhead cable corresponding to the f-th detection time point in the current detection period, ΔU is represented as the set allowable voltage difference, and d4, d5, and d6 are represented as the set weight factors respectively;

[0115] According to the formula DP i =LW i ×d7+YW i ×d8 Calculate the electrical evaluation index DP of each overhead cable in the target area corresponding to the current detection period i , d7 and d8 represent the set influence factors respectively.

[0116] In a specific embodiment, the present invention detects and analyzes the current and voltage at each detection time point in the current detection period corresponding to each detection point of each overhead cable in the target area, so as to obtain more accurate and stable electrical parameters, reduce errors caused by instantaneous fluctuations, and thus more accurately judge the electrical state of the cable. The electrical evaluation index of each overhead cable in the target area corresponding to the current detection period is analyzed, which helps to discover potential electrical instability problems, promptly discover and handle short-circuit faults, improve the timeliness of fault detection response and the reliability of power supply, and meet users' continuous demand for electricity.

[0117] The fault analysis module is used to analyze the fault type of each overhead cable corresponding to the target area based on the insulation evaluation index, load evaluation index, and electrical evaluation index of each overhead cable corresponding to the target area, obtain the fault type of each overhead cable corresponding to the target area, and send it to the fault processing terminal. The specific analysis method is as follows:

[0118] The insulation evaluation index of each overhead cable in the target area corresponding to the current detection period is compared with the set insulation evaluation index threshold. If the insulation evaluation index of an overhead cable in the target area corresponding to the current detection period is less than the set insulation evaluation index threshold, it is determined that the fault type of the overhead cable in the target area corresponding to the current detection period is the insulation damage type;

[0119] Compare the load assessment index of each overhead cable in the target area corresponding to the current detection period with the set load assessment index threshold. If the load assessment index of a certain overhead cable in the target area corresponding to the current detection period is greater than the set load assessment index threshold, then determine that the fault type of the overhead cable in the target area corresponding to the current detection period is an overload type;

[0120] The electrical evaluation index of each overhead cable corresponding to the target area is compared with the set electrical evaluation index threshold. If the electrical evaluation index of an overhead cable corresponding to the target area is less than the set electrical evaluation index threshold, the fault type of the overhead cable corresponding to the target area is determined to be a short circuit type.

[0121] The fault processing terminal is used to receive the fault type of each overhead cable in the target area, and perform corresponding processing based on the fault type of each overhead cable in the target area.

[0122] In a specific embodiment, if the fault type of an overhead cable is an insulation damage fault type, the insulation abnormality of the overhead cable will be displayed through the display in the fault handling terminal, specifically displayed as "There is insulation damage in a certain overhead cable, please repair it as soon as possible", and at the same time, the location information corresponding to the overhead cable is extracted from the system repository, and the location information corresponding to the overhead cable is warned through the alarm device in the fault handling terminal.

[0123] If the fault type of an overhead cable is an overload fault type, the load of the overhead cable will be abnormally displayed through the display in the fault handling terminal, specifically displaying "There is an overload fault in a certain overhead cable, please repair it as soon as possible", and at the same time, the location information corresponding to the overhead cable is extracted from the system repository, and the location information corresponding to the overhead cable is warned through the alarm device in the fault handling terminal.

[0124] If the fault type of an overhead cable is a short circuit fault type, the electrical abnormality of the overhead cable will be displayed through the display in the fault handling terminal, specifically displaying "A certain overhead cable has a short circuit fault, please repair it as soon as possible". At the same time, the location information corresponding to the overhead cable is extracted from the system repository, and the corresponding location information of the overhead cable is warned through the alarm device in the fault handling terminal.

[0125] In a specific embodiment, corresponding prompt information is displayed according to the fault type of each overhead cable in the target area, which can accurately determine the fault type of the overhead cables in the target area, help technicians quickly locate the problem and take corresponding measures, thereby effectively improving the fault handling efficiency.

[0126] The system repository is used to store the specification information of each overhead cable in the target area and the corresponding position information of each overhead cable in the target area.

[0127] The specific sizes of the weight factors, weight factors, influence factors, and proportional factors involved in the present invention are not given. Their sizes are customized by technicians in this field according to actual use and stored in the system repository. The formulas involved are all customized empirical formulas, which are pre-stored in the system repository.

[0128] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. Overhead cable fault detection system based on wireless sensors, characterized in that: include: The insulation detection module is used to detect the insulation parameters of each overhead cable in the target area corresponding to the current detection period, obtain the insulation parameters of each overhead cable in the target area corresponding to the current detection period, and analyze the insulation evaluation index of each overhead cable in the target area corresponding to the current detection period to obtain the insulation evaluation index of each overhead cable in the target area corresponding to the current detection period; A load detection module is used to detect the load parameters of each overhead cable in the target area corresponding to the current detection period, obtain the load parameters of each overhead cable in the target area corresponding to the current detection period, and thereby analyze the load evaluation index of each overhead cable in the target area corresponding to the current detection period, and obtain the load evaluation index of each overhead cable in the target area corresponding to the current detection period; An electrical detection module is used to detect the electrical parameters of each overhead cable in the target area corresponding to the current detection period, obtain the electrical parameters of each overhead cable in the target area corresponding to the current detection period, and thereby analyze the electrical evaluation index of each overhead cable in the target area corresponding to the current detection period, and obtain the electrical evaluation index of each overhead cable in the target area corresponding to the current detection period; A fault analysis module is used to analyze the fault type of each overhead cable corresponding to the target area based on the insulation evaluation index, load evaluation index, and electrical evaluation index of each overhead cable corresponding to the target area, obtain the fault type of each overhead cable corresponding to the target area, and send it to the fault processing terminal; The fault processing terminal is used to receive the fault type of each overhead cable in the target area, and perform corresponding processing based on the fault type of each overhead cable in the target area.

2. The overhead cable fault detection system based on wireless sensors according to claim 1 is characterized in that: The insulation parameters of each overhead cable in the target area corresponding to the current detection period are detected in the following specific detection method: The insulation layer images of each overhead cable in the target area corresponding to the current detection period are collected by the intelligent camera to obtain the insulation layer images of each overhead cable in the target area corresponding to the current detection period; Identify each abnormal area from the insulation layer image of each overhead cable in the target area corresponding to the current detection period, and extract the insulation layer image of each abnormal area in the current detection period of each overhead cable in the target area from the insulation layer image of each overhead cable in the target area corresponding to the current detection period; Match the insulation layer images of each abnormal area in the current detection period corresponding to each overhead cable in the target area with the insulation layer images of the area corresponding to each abnormal type, and obtain the abnormal type of each abnormal area in the current detection period corresponding to each overhead cable in the target area, wherein the abnormal type is specifically a detachment type, a fracture type, and a damage type, and classify each abnormal area in the current detection period corresponding to each overhead cable in the target area based on the abnormal type of each abnormal area in the current detection period corresponding to each overhead cable in the target area, and obtain each detachment area, each fracture area, and each damage area in the current detection period corresponding to each overhead cable in the target area; Extract the detached area of ​​each detached area, the fractured area of ​​each fractured area, and the damaged area of ​​each damaged area of ​​each overhead cable in the target area corresponding to the current detection period from the insulation layer images of each abnormal area in the current detection period corresponding to each overhead cable in the target area; The dropped areas of each overhead cable in the target area corresponding to the current detection period are accumulated to obtain the total dropped area of ​​each overhead cable in the target area corresponding to the current detection period, and the number of dropped areas of each overhead cable in the target area corresponding to the current detection period is counted; The falling areas of each fractured area of ​​each overhead cable in the target area corresponding to the current detection period are accumulated to obtain the total area of ​​the fractured area of ​​each overhead cable in the target area corresponding to the current detection period, and the number of fractured areas of each overhead cable in the target area corresponding to the current detection period is counted; Accumulate the damaged areas of each detached area of ​​each overhead cable in the target area corresponding to the current detection period to obtain the total area of ​​the damaged area of ​​each overhead cable in the target area corresponding to the current detection period, and count the number of damaged areas of each overhead cable in the target area corresponding to the current detection period; The insulation parameters of each overhead cable in the target area corresponding to the current detection period are composed of the total area of ​​the detached areas, the total area of ​​the broken areas, the total area of ​​the damaged areas, the number of detached areas, the number of broken areas and the number of damaged areas of each overhead cable in the target area corresponding to the current detection period.

3. The overhead cable fault detection system based on wireless sensors according to claim 1 is characterized in that: The insulation evaluation index of each overhead cable in the target area corresponding to the current detection period is analyzed in the following specific analysis method: The total area of ​​the falling area, the total area of ​​the broken area, and the total area of ​​the damaged area of ​​each overhead cable in the target area corresponding to the current detection period are extracted from the insulation parameters of each overhead cable in the target area corresponding to the current detection period, and are recorded as TS i DS i ,PS i , extract the number of falling areas, broken areas, and damaged areas of each overhead cable in the target area corresponding to the current detection period, and record them as TN i DN i PN i , i represents the number of each overhead cable, i=1,2,....,m, m represents the total number of overhead cable numbers; According to the formula Calculate the insulation evaluation index JY of each overhead cable in the target area corresponding to the current detection period i , a1, a2, a3, a4, a5, and a6 represent the set weight factors respectively.

4. The overhead cable fault detection system based on wireless sensors according to claim 1, characterized in that: The load parameters of each overhead cable in the target area corresponding to the current detection period are detected in the following specific detection method: Arrange detection points of each overhead cable in the target area in a uniformly set manner to obtain detection points of each overhead cable in the target area, detect the temperature of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period by a temperature sensor, obtain the temperature of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period, and form a temperature data set of each overhead cable in the target area corresponding to the current detection period; The voltage at both ends of each overhead cable in the target area corresponding to each detection time point in the current detection period is collected by a voltage sensor to obtain the voltage at both ends of each overhead cable in the target area corresponding to each detection time point in the current detection period, and a difference calculation is performed to obtain the voltage drop of each overhead cable in the target area corresponding to each detection time point in the current detection period, thereby forming a voltage drop data set of each overhead cable in the target area corresponding to the current detection period; The atmospheric temperature of each overhead cable in the target area at each detection time point in the current detection period is collected by a temperature sensor to obtain the atmospheric temperature of each overhead cable in the target area at each detection time point in the current detection period, and the average value is calculated to obtain the atmospheric temperature of each overhead cable in the target area at the current detection period; The atmospheric humidity of each overhead cable in the target area at each detection time point in the current detection period is collected by a humidity sensor to obtain the atmospheric humidity of each overhead cable in the target area at each detection time point in the current detection period, and the average value is calculated to obtain the atmospheric humidity of each overhead cable in the target area at the current detection period; The wind speed of each overhead cable in the target area at each detection time point in the current detection period is collected by a wind speed sensor to obtain the wind speed of each overhead cable in the target area at each detection time point in the current detection period, and the average is calculated to obtain the wind speed of each overhead cable in the target area at the current detection period; This constitutes a set of environmental data corresponding to the current detection period for each overhead cable in the target area; The load parameters of each overhead cable in the target area are constituted by the temperature data set, voltage drop data set and environmental data set of each overhead cable in the target area corresponding to the current detection period.

5. The overhead cable fault detection system based on wireless sensors according to claim 1, characterized in that: The load evaluation index of each overhead cable in the target area corresponding to the current detection period is analyzed in the following specific analysis method: Extract the temperature of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period from the load parameters of each overhead cable in the target area, arrange the temperatures of each detection point in the target area corresponding to each detection time point in the current detection period in order from large to small, and obtain the temperature sequence of each detection point of each overhead cable in the target area corresponding to the current detection period, and extract the maximum temperature, minimum temperature, median temperature, and mode temperature values ​​therefrom; The atmospheric temperature, atmospheric humidity and wind speed of each overhead cable in the target area corresponding to the current detection period are extracted from the load parameters of each overhead cable in the target area, and the environmental impact coefficient of each overhead cable in the target area corresponding to the current detection period is obtained through analysis; Matching the environmental impact coefficient of each overhead cable in the target area corresponding to the current detection period with the reference overhead cable temperature corresponding to each set environmental impact coefficient to obtain the reference overhead cable temperature of each overhead cable in the target area corresponding to the current detection period; The temperature uniformity index of each detection point of each overhead cable in the target area corresponding to the current detection period is calculated by the formula j represents the number of each detection point, j = 1, 2, ...., n, n represents the total number of detection point numbers; Arrange the temperatures of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period in order from large to small, and obtain the temperature sequence of each overhead cable in the target area corresponding to each detection time point in the current detection period, and extract the values ​​of the maximum temperature, minimum temperature, median temperature, and mode temperature from them, and calculate the temperature uniformity index of each overhead cable in the target area corresponding to each detection time point in the current detection period by the formula f represents the number of each detection time point, f = 1, 2, ...., g, g represents the total number of detection time point numbers; According to the formula Calculate the temperature stability evaluation index WW of each overhead cable in the target area corresponding to the current detection period i , b9 and b10 represent the set proportional factors respectively; The voltage drop of each overhead cable in the target area at each detection time point in the current detection period is extracted from the load parameters of each overhead cable in the target area, and recorded as The specification information of each overhead cable in the target area is extracted from the specification information of each overhead cable in the target area stored in the system repository, and matched with the rated voltage corresponding to each set specification information to obtain the rated voltage of each overhead cable in the target area, which is recorded as According to the formula Calculate the voltage drop load factor YX of each overhead cable in the target area corresponding to the current detection period i , L i It is expressed as the length of each overhead cable in the target area; According to the formula Calculate the load evaluation index FZ of each overhead cable in the target area corresponding to the current detection period i , w1 and w2 represent the set influence factors respectively.

6. The overhead cable fault detection system based on wireless sensors according to claim 1, characterized in that: The electrical parameters of each overhead cable in the target area corresponding to the current detection period are detected, and the specific analysis method is as follows: The current at each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period is detected by a wireless current sensor to obtain the current at each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period, and the average current is calculated to obtain the average current of each overhead cable in the target area corresponding to each detection time point in the current detection period as the current of each overhead cable in the target area corresponding to each detection time point in the current detection period, thereby forming a current data set of each overhead cable in the target area corresponding to the current detection period; The voltage of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period is detected by a voltage sensor to obtain the voltage of each detection point of each overhead cable in the target area corresponding to each detection time point in the current detection period, and the average value is calculated to obtain the average voltage of each overhead cable in the target area corresponding to each detection time point in the current detection period as the voltage of each overhead cable in the target area corresponding to each detection time point in the current detection period, thereby forming a voltage data set of each overhead cable in the target area corresponding to the current detection period; The electrical parameters of each overhead cable in the target area corresponding to the current detection period are constituted by the current data set and the voltage data set of each overhead cable in the target area.

7. The overhead cable fault detection system based on wireless sensors according to claim 1, characterized in that: The electrical evaluation index of each overhead cable in the target area corresponding to the current detection period is analyzed in the following specific analysis method: The current data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the maximum current and minimum current are extracted from them, which are recorded as According to the formula Calculate the current stability evaluation index LW of each overhead cable in the target area corresponding to the current detection period i , It is represented as the current of the ith overhead cable corresponding to the fth detection time point in the current detection period, ΔI is represented as the set allowable current difference, and d1, d2, and d3 are represented as the set weight factors respectively; The voltage data set of each overhead cable in the target area corresponding to the current detection period is obtained from the load parameters of each overhead cable in the target area, and the maximum voltage and minimum voltage are extracted from them, which are recorded as According to the formula Calculate the voltage stability assessment index YW of each overhead cable in the target area corresponding to the current detection period i , It is represented as the voltage of the i-th overhead cable corresponding to the f-th detection time point in the current detection period, ΔU is represented as the set allowable voltage difference, and d4, d5, and d6 are represented as the set weight factors respectively; According to the formula DP i =LW i ×d7+YW i ×d8 Calculate the electrical evaluation index DP of each overhead cable in the target area corresponding to the current detection period i , d7 and d8 represent the set influence factors respectively.

8. The overhead cable fault detection system based on wireless sensors according to claim 1, characterized in that: The fault type of each overhead cable corresponding to the target area is analyzed based on the insulation evaluation index, load evaluation index, and electrical evaluation index of each overhead cable corresponding to the target area. The specific analysis method is as follows: The insulation evaluation index of each overhead cable in the target area corresponding to the current detection period is compared with the set insulation evaluation index threshold. If the insulation evaluation index of an overhead cable in the target area corresponding to the current detection period is less than the set insulation evaluation index threshold, it is determined that the fault type of the overhead cable in the target area corresponding to the current detection period is the insulation damage type; Compare the load assessment index of each overhead cable in the target area corresponding to the current detection period with the set load assessment index threshold. If the load assessment index of a certain overhead cable in the target area corresponding to the current detection period is greater than the set load assessment index threshold, then determine that the fault type of the overhead cable in the target area corresponding to the current detection period is an overload type; The electrical evaluation index of each overhead cable corresponding to the target area is compared with the set electrical evaluation index threshold. If the electrical evaluation index of an overhead cable corresponding to the target area is less than the set electrical evaluation index threshold, the fault type of the overhead cable corresponding to the target area is determined to be a short circuit type.

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