Cable buffer burnout hot spot detection apparatus, method, and electronic device and medium

Abstract

The application discloses a kind of cable buffer layer ablation hot spot detection device and method, including temperature information acquisition module, temperature information extraction module, hot spot analysis module, and the temperature physical quantity information of high-voltage cable is obtained by sensing unit;Based on temperature physical quantity information extraction heating area, heating area length, hot spot temperature and reference temperature, analysis obtains hot spot temperature maximum and reference temperature benchmark value, calculates the actual hot spot temperature rise at the position of high-voltage cable buffer layer hot spot temperature maximum.The temperature signal and its change condition of the present application are perceived by temperature information acquisition module installed on the surface of cable outer sheath and pipe gallery, the hot spot characteristics are calculated and analyzed, alarm is realized before the defect of high-voltage cable buffer layer develops into fault, to avoid high-voltage cable system breakdown or fire failure.

Description

Technical Field

[0001] This invention relates to the field of optical inspection, specifically to a device, method, electronic equipment, and medium for detecting hot spots caused by ablation of cable buffer layers. Background Technology

[0002] High-voltage cable buffer layer erosion defects severely affect the safe and stable operation of cable lines. In recent years, major cities in China, including Beijing, Shanghai, and Guangzhou, have frequently experienced high-voltage cable breakdown accidents caused by buffer layer erosion. The faulty cables involve multiple manufacturers, primarily concentrated in high-voltage cables with corrugated aluminum sheaths. This is a structural defect in the cable, and many latent erosion defects remain undetected, causing significant economic losses, with a trend of increasing year by year. According to incomplete statistics, from 2017 to 2022, more than 30 failures in high-voltage cable buffer layer erosion defects occurred in major Chinese cities, accounting for over 80% of high-voltage cable insulation failures.

[0003] Currently, extensive research has been conducted both domestically and internationally on the mechanism of high-voltage cable buffer layer ablation failure. The detection technologies proposed for high-voltage cable buffer layer ablation defects mainly include cable disassembly, resistivity, leakage current, X-ray imaging, broadband impedance spectroscopy, partial discharge detection, and ablation gas detection. However, their accuracy, operability, safety, and applicability are all insufficient to meet the detection requirements for buffer layer ablation defects in existing high-voltage cables in operation. Breakthroughs in high-voltage cable buffer layer ablation defect detection and diagnosis technology are urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a cable buffer layer ablation hotspot detection device, method, electronic device and medium, which can effectively improve the detection capability of ablation defects in high-voltage cable buffer layers and prevent high-voltage cable breakdown faults or fire faults.

[0005] To achieve this objective, the cable buffer layer ablation hotspot detection device designed in this invention includes a temperature information acquisition module, a temperature information extraction module, and a hotspot analysis module. The temperature information acquisition module is used to acquire several temperature physical quantities of the high-voltage cable through sensors. The temperature information extraction module is used to extract the heating area, heating area length, hotspot temperature, and reference temperature based on the temperature physical quantities acquired by the temperature information acquisition module. The hotspot analysis module is used to analyze and obtain the maximum hotspot temperature and the reference temperature base value based on the temperature physical quantities, the heating area length, the hotspot temperature, and the reference temperature, and calculate the actual hotspot temperature rise at the location of the maximum hotspot temperature in the high-voltage cable buffer layer.

[0006] The temperature information acquisition module includes at least one of a body temperature measurement unit and an infrared thermal imaging unit. When the temperature information acquisition module uses an infrared thermal imaging unit, it should also include a channel ambient temperature unit. The body temperature measurement unit is used to measure the body temperature of the high-voltage cable based on the body temperature measurement unit and provide the location information of the body temperature measurement unit. The infrared thermal imaging unit is used to acquire a thermal image of the high-voltage cable within the monitoring area and provide the location information of the infrared thermal imaging unit. It is also used to measure the body temperature of the high-voltage cable based on the infrared thermal imaging unit and the temperature at the location of the channel ambient temperature unit. The channel ambient temperature unit is used to measure the ambient temperature of the high-voltage cable channel at its installation location.

[0007] The temperature information extraction module extracts the length of the heating region, the hot spot temperature, and the reference temperature based on the temperature physical quantity information obtained by the body temperature measurement unit in the temperature information acquisition module. The specific method is as follows:

[0008] The high-voltage cable body temperature information acquired by the body temperature measurement unit in the temperature information acquisition module includes (L) i ,T i ), i = 0, 1, 2, ..., n, L represents the length of the high-voltage cable, T represents the temperature of the high-voltage cable body, i represents the ordinal number of the body temperature measurement unit, n represents the number of body temperature measurement units, L i T represents the high-voltage cable length information corresponding to the position information of the i-th body temperature measurement unit. i This represents the high-voltage cable body temperature measured by the i-th body temperature measurement unit; the heating area extracted by the body temperature measurement unit in the temperature information acquisition module is the area L where the high-voltage cable body temperature exceeds the set body temperature threshold. x ~L y L x L indicates the starting point where the temperature of the high-voltage cable body exceeds the set threshold temperature. y The endpoint position where the high-voltage cable body temperature exceeds the set threshold is indicated, where x and y belong to the set i; the length ΔL of the heating area based on the body temperature measurement unit is the length of the area where the high-voltage cable body temperature exceeds the set threshold; the reference temperature extracted by the body temperature measurement unit in the temperature information acquisition module is the high-voltage cable body temperature that does not belong to the heating area.

[0009] The hotspot analysis module uses the temperature physical quantity information obtained by the temperature information acquisition module, as well as the length of the heating area, hotspot temperature, and reference temperature extracted by the temperature information extraction module, to analyze and obtain the maximum hotspot temperature and the reference temperature baseline value T. cThe actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is calculated using the following method:

[0010] The maximum hotspot temperature T in the temperature information extraction module is obtained through analysis. r，max and the location L where the maximum hot spot temperature of the high-voltage cable body is located. r，max The temperature rise at the maximum hot spot temperature of the high-voltage cable body, based on the body temperature measurement unit, is calculated using the following formula:

[0011] ΔT=T r，max -T c

[0012] In the formula, ΔT is the temperature rise at the maximum hot spot temperature of the high-voltage cable body based on the body temperature measurement unit, and T r，max T represents the maximum hot spot temperature of the high-voltage cable body. c The reference temperature base value extracted by the body temperature measurement unit;

[0013] The specific method for obtaining the reference temperature benchmark value is as follows: compare the adjacent high-voltage cable body temperatures within the reference temperature range, and select the high-voltage cable body temperature with an adjacent temperature difference of 0 within the range excluding the heating area as the reference temperature benchmark value T. c c is the ordinal number of the reference temperature base value, 0 < c < x or c > y;

[0014] The actual hot spot temperature rise ΔT' at the location of the maximum hot spot temperature in the high-voltage cable buffer layer based on the body temperature measurement unit is calculated using the following formula:

[0015] ΔT′=ΔT+W s R T2 +(W s +W p (R) T3 +R T4 )

[0016] In the formula, ΔT′ is the actual hot spot temperature rise at the location of the maximum hot spot temperature of the high-voltage cable buffer layer based on the body temperature measurement unit, ΔT is the temperature rise at the location of the maximum hot spot temperature of the high-voltage cable body, and W s For the loss of the buffer layer, W p For the first outer sheath loss, R T2 R is the thermal resistance of the buffer layer. T3 For the thermal resistance of the second outer sheath, R T4 The thermal resistance of the outer medium of the second outer sheath.

[0017] The temperature information extraction module extracts the length of the heating area, the hot spot temperature, and the reference temperature based on the infrared thermal imaging unit. Specifically, the temperature information extraction module extracts the length of the heating area, the hot spot temperature, and the reference temperature θ of the non-heating area of ​​the cable body based on the high-voltage cable body temperature obtained by the infrared thermal imaging unit in the temperature information acquisition module. c The reference temperature θ at the comparison point with the ambient temperature unit location in the channel b The implementation method is as follows:

[0018] First, identify the location information of the high-voltage cable body and channel ambient temperature unit in the high-voltage cable thermal image; set the starting point and ending point of the marker line along the high-voltage cable in the high-voltage cable thermal image, and calculate the marker line length 'a'; divide the marker line length 'a' into m equal parts to obtain (a j θ j ), j = 0, 1, 2.....m, a j θ represents the length of the marker line at the j-th division position. j The temperature of the high-voltage cable body based on the infrared thermal imaging unit represents the j-th division position, where j represents the division number and m represents the total number of divisions.

[0019] The length Δa of the heating area based on the infrared thermal imaging unit is the area where the temperature of the high-voltage cable body exceeds a set threshold temperature [a]. p a q The calculation yielded the following:

[0020] Δa=k|a p -a q |

[0021] Where k is the ratio coefficient between the actual cable length and the length of the high-voltage cable body in the high-voltage cable thermal image, and a p a represents the starting point of the heating area in the thermal image of the high-voltage cable. q The endpoint of the heating area in the thermal image of the high-voltage cable is indicated by p, q, which belong to the set j.

[0022] Extracting the heating area from the thermal image of a high-voltage cable [a] p a q The hotspot temperature θ r For a r The corresponding high-voltage cable body temperature based on the infrared thermal imaging unit at the location, a r It is a fever area [a] p a q For any position in the [], p≤r≤q;

[0023] The reference temperature θ extracted by the infrared thermal imaging unit in the temperature information acquisition module. c The temperature of the high-voltage cable body based on the infrared thermal imaging unit is located in the area excluding the heating area, and c is the ordinal number of the reference temperature based on the infrared thermal imaging unit, where 0 < c q.

[0024] The reference temperature θ at the comparison point location of the channel ambient temperature unit. b The temperature at the location of the channel ambient temperature unit, obtained by the infrared thermal imaging unit;

[0025] If a high-voltage cable thermal image contains multiple high-voltage cables, then the length of the heating zone, the hot spot temperature, and the reference temperature θ of the non-heating zone of the cable body should be extracted for each high-voltage cable. c The reference temperature θ at the comparison point with the ambient temperature unit location in the channel b .

[0026] The hotspot analysis module calculates the actual hotspot temperature rise at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the high-voltage cable thermal image obtained by the temperature information acquisition module and the length of the heating area, hotspot temperature, and reference temperature extracted by the temperature information extraction module. The specific method is as follows:

[0027] The hotspot analysis module analyzes and obtains the maximum hotspot temperature θ of the high-voltage cable body from the temperature information extraction module. r，max and the location a of the maximum hot spot temperature of the high-voltage cable body r，max The temperature rise Δθ at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit is calculated using the following formula:

[0028] Δθ=θ r，max -θ c +T s -θ b

[0029] In the formula, Δθ represents the temperature rise at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit, and θ r，max θ represents the maximum temperature of the hot spot in the high-voltage cable thermal image. b T is the reference temperature at the comparison point location of the channel ambient temperature unit. s The ambient temperature of the high-voltage cable channel at its installation location is obtained by the channel ambient temperature unit.

[0030] The actual hotspot temperature rise Δθ' at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the infrared thermal imaging unit is calculated using the following formula:

[0031] Δθ'=Δθ+W s RT2 +(W s +W p (R) T3 +R T4 )

[0032] In the formula, Δθ' is the actual hotspot temperature rise at the location of the maximum hotspot temperature of the high-voltage cable buffer layer based on the infrared thermal imaging unit, and Δθ is the temperature rise at the location of the maximum hotspot temperature of the high-voltage cable body calculated by the temperature information extraction module. s For buffer layer loss, W p For the first outer sheath loss, R T2 For the thermal resistance of the buffer layer, R T3 For the thermal resistance of the second outer sheath, R T4 The thermal resistance of the medium surrounding the high-voltage cable.

[0033] A method for detecting ablation hotspots in a cable buffer layer, comprising the following steps:

[0034] Several temperature-related physical quantities of the high-voltage cable are obtained through sensors;

[0035] Based on the temperature physical quantity information, the heating area, heating area length, hot spot temperature, and reference temperature are extracted;

[0036] Based on the temperature physical quantity information, the length of the heating area, the hot spot temperature, and the reference temperature, the maximum hot spot temperature and the reference temperature benchmark value are analyzed and obtained, and the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is calculated.

[0037] The sensor includes at least one of a body temperature measurement unit and an infrared thermal imaging unit. When an infrared thermal imaging unit is used, it should also include a channel ambient temperature unit.

[0038] The body temperature measurement unit is used to measure the body temperature of the high-voltage cable based on the body temperature measurement unit and to provide the location information of the body temperature measurement unit;

[0039] The infrared thermal imaging unit is used to acquire thermal images of the high-voltage cable within the monitoring area and provide the location information of the infrared thermal imaging unit. It is also used to measure the temperature of the high-voltage cable body and the temperature at the location of the channel ambient temperature unit based on the infrared thermal imaging unit.

[0040] The channel ambient temperature unit is used to measure the ambient temperature of the high-voltage cable channel at its installation location.

[0041] Based on the temperature physical quantity information obtained from the body temperature measurement unit, the length of the heating area, the hot spot temperature, and the reference temperature are extracted. The specific method is as follows:

[0042] The high-voltage cable body temperature information acquired by the body temperature measurement unit includes (L) i T i ), i = 0, 1, 2, ..., n, L represents the length of the high-voltage cable, T represents the temperature of the high-voltage cable body, i represents the ordinal number of the body temperature measurement unit, n represents the number of body temperature measurement units, L i T represents the high-voltage cable length information corresponding to the position information of the i-th body temperature measurement unit. i This represents the high-voltage cable body temperature measured by the i-th body temperature measurement unit;

[0043] The heating area extracted by the body temperature measurement unit is the region L where the body temperature of the high-voltage cable exceeds the set body temperature threshold. x ~L y L x L indicates the starting point where the temperature of the high-voltage cable body exceeds the set threshold temperature. y This indicates the endpoint where the temperature of the high-voltage cable body exceeds the set threshold for the body temperature, where x and y belong to the set i;

[0044] The length ΔL of the heating area based on the body temperature measurement unit is the length of the area where the body temperature of the high-voltage cable exceeds the set threshold temperature of the body.

[0045] ΔL=|L x -L y |

[0046] The hotspot temperature T extracted based on the body temperature measurement unit r L within the heating area r The temperature of the high-voltage cable body at the location, r is the ordinal number of the hot spot temperature, x≤r≤y;

[0047] The reference temperature extracted by the body temperature measurement unit is the body temperature of the high-voltage cable that does not belong to the heating zone.

[0048] The extracted heating region length, hotspot temperature, and reference temperature were analyzed to obtain the maximum hotspot temperature and the reference temperature baseline value T. c The actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is calculated using the following method:

[0049] The maximum temperature T of the hotspot was obtained through analysis. r，max and the location L where the maximum hot spot temperature of the high-voltage cable body is located. r，max The temperature rise at the maximum hot spot temperature of the high-voltage cable body, based on the body temperature measurement unit, is calculated using the following formula:

[0050] ΔT=T r，max -Tc

[0051] In the formula, ΔT is the temperature rise at the maximum hot spot temperature of the high-voltage cable body based on the body temperature measurement unit, and T r，max T represents the maximum hot spot temperature of the high-voltage cable body. c The reference temperature base value extracted by the body temperature measurement unit;

[0052] The specific method for obtaining the reference temperature benchmark value is as follows: compare the adjacent high-voltage cable body temperatures within the reference temperature range, and select the high-voltage cable body temperature with an adjacent temperature difference of 0 within the range excluding the heating area as the reference temperature benchmark value T. c c is the ordinal number of the reference temperature base value, 0 < c < x or c > y;

[0053] The actual hot spot temperature rise ΔT' at the location of the maximum hot spot temperature in the high-voltage cable buffer layer based on the body temperature measurement unit is calculated using the following formula:

[0054] ΔT′=ΔT+W s R T2 +(W s +W p (R) T3 +R T4 )

[0055] In the formula, ΔT′ is the actual hot spot temperature rise at the location of the maximum hot spot temperature of the high-voltage cable buffer layer based on the body temperature measurement unit, ΔT is the temperature rise at the location of the maximum hot spot temperature of the high-voltage cable body, and W s For the loss of the buffer layer, W p For the first outer sheath loss, R T2 R is the thermal resistance of the buffer layer. T3 For the thermal resistance of the second outer sheath, R T4 The thermal resistance of the outer medium of the second outer sheath.

[0056] The method for extracting the length of the heating region, the hot spot temperature, and the reference temperature based on the infrared thermal imaging unit is as follows:

[0057] Based on the high-voltage cable body temperature obtained by the infrared thermal imaging unit, the length of the heating area, the hot spot temperature, and the reference temperature θ of the non-heating area of ​​the cable body are extracted. c The reference temperature θ at the comparison point with the ambient temperature unit location in the channel b The implementation method is as follows:

[0058] First, identify the location information of the high-voltage cable body and channel ambient temperature unit in the high-voltage cable thermal image; set the starting point and ending point of the marker line along the high-voltage cable in the high-voltage cable thermal image, and calculate the marker line length 'a'; divide the marker line length 'a' into m equal parts to obtain (a j θ j ), j = 0, 1, 2.....m, a j θ represents the length of the marker line at the j-th division position. j The temperature of the high-voltage cable body based on the infrared thermal imaging unit represents the j-th division position, where j represents the division number and m represents the total number of divisions.

[0059] The length Δa of the heating area based on the infrared thermal imaging unit is the area where the temperature of the high-voltage cable body exceeds a set threshold temperature [a]. p a q The calculation yielded the following:

[0060] Δa=k|a p -a q |

[0061] Where k is the ratio coefficient between the actual cable length and the length of the high-voltage cable body in the high-voltage cable thermal image, and a p a represents the starting point of the heating area in the thermal image of the high-voltage cable. q The endpoint of the heating area in the thermal image of the high-voltage cable is indicated by p, q, which belong to the set j.

[0062] Extracting the heating area from the thermal image of a high-voltage cable [a] p a q The hotspot temperature θ r For a r The corresponding high-voltage cable body temperature based on the infrared thermal imaging unit at the location, a r It is a fever area [a] p a q For any position in the [], p≤r≤q;

[0063] The reference temperature θ extracted based on the infrared thermal imaging unit. c The temperature of the high-voltage cable body based on the infrared thermal imaging unit is located in the area excluding the heating area, and c is the ordinal number of the reference temperature based on the infrared thermal imaging unit, where 0 < c q.

[0064] The reference temperature θ at the comparison point location of the channel ambient temperature unit. b The temperature at the location of the channel ambient temperature unit, obtained by the infrared thermal imaging unit;

[0065] If a high-voltage cable thermal image contains multiple high-voltage cables, then the length of the heating zone, the hot spot temperature, and the reference temperature θ of the non-heating zone of the cable body should be extracted for each high-voltage cable. c The reference temperature θ at the comparison point with the ambient temperature unit location in the channel b .

[0066] Based on the length of the heating area, the hot spot temperature, and the reference temperature extracted from the thermal image of the high-voltage cable, the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is calculated. The specific method is as follows:

[0067] The maximum hot spot temperature θ of the high-voltage cable body was obtained through analysis. r，max and the location a of the maximum hot spot temperature of the high-voltage cable body r，max The temperature rise Δθ at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit is calculated using the following formula:

[0068] Δθ=θ r，max -θ c +T s -θ b

[0069] In the formula, Δθ represents the temperature rise at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit, and θ r，max θ represents the maximum temperature of the hot spot in the high-voltage cable thermal image. b T is the reference temperature at the comparison point location of the channel ambient temperature unit. s The ambient temperature of the high-voltage cable channel at its installation location is obtained by the channel ambient temperature unit.

[0070] The actual hotspot temperature rise Δθ' at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the infrared thermal imaging unit is calculated using the following formula:

[0071] Δθ'=Δθ+W s R T2 +(W s +W p (R) T3 +R T4 )

[0072] In the formula, Δθ' is the actual hotspot temperature rise at the location of the maximum hotspot temperature of the high-voltage cable buffer layer based on the infrared thermal imaging unit, and Δθ is the temperature rise at the location of the maximum hotspot temperature of the high-voltage cable body calculated by the temperature information extraction module. s For buffer layer loss, W p For the first outer sheath loss, R T2 For the thermal resistance of the buffer layer, R T3 For the thermal resistance of the second outer sheath, R T4The thermal resistance of the medium surrounding the high-voltage cable.

[0073] The beneficial effects of this invention are as follows: This invention senses the temperature signal and its changes by installing a temperature information acquisition module on the surface of the cable outer sheath and the pipe gallery, calculates and analyzes the hot spot characteristics, and realizes the alarm before the high-voltage cable buffer layer develops into a fault, thus avoiding the breakdown or fire fault of the high-voltage cable system. Compared with the existing methods, this invention uses an external temperature sensor for sensing, without damaging the cable structure, realizes the visualization of defect heating, has low cost and does not affect the safety of cable operation or the health of maintenance personnel. Attached Figure Description

[0074] Figure 1 This is a structural diagram of the device of the present invention;

[0075] Figure 2 This is a flowchart of the method of the present invention;

[0076] Figure 3 This is a schematic diagram illustrating an embodiment of the operation of a device under this invention;

[0077] Figure 4 This is a temperature information map detected by the infrared thermal imaging unit under this invention;

[0078] Figure 5 This is a structural diagram of a high-voltage cable;

[0079] Among them, 1-temperature information acquisition module, 2-temperature information extraction module, 3-hot spot analysis module, 4-defect identification module, 5-display alarm module, 11-conductor, 12-conductor shielding layer, 13-insulation layer, 14-insulation shielding layer, 15-buffer layer, 16-first outer sheath and 17-second outer sheath. Detailed Implementation

[0080] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0081] Example 1:

[0082] A cable buffer layer ablation hotspot detection device, such as Figure 1 As shown, it includes a temperature information acquisition module 1, a temperature information extraction module 2, a hotspot analysis module 3, and a defect identification module 4.

[0083] The temperature information acquisition module 1 is used to acquire several temperature physical quantities of the high-voltage cable through sensors;

[0084] The temperature information extraction module 2 is used to extract the heating area, heating area length, hot spot temperature and reference temperature from the temperature physical quantity information obtained by the temperature information acquisition module 1.

[0085] The hot spot analysis module 3 is used to analyze the temperature physical quantity information obtained by the temperature information acquisition module 1 and the heating area length, hot spot temperature and reference temperature extracted by the temperature information extraction module 2 to obtain the maximum hot spot temperature and the reference temperature base value, and to calculate the actual hot spot temperature rise at the location of the maximum hot spot temperature of the high voltage cable buffer layer.

[0086] The defect identification module 4 is used to identify the defect type and severity and output the results.

[0087] In the above technical solution, the temperature information acquisition module 1 includes at least one of a body temperature measurement unit and an infrared thermal imaging unit. When the temperature information acquisition module 1 uses an infrared thermal imaging unit, it should also include a channel ambient temperature unit.

[0088] The body temperature measurement unit can be a fiber optic temperature sensor or a distributed fiber optic temperature sensor.

[0089] The body temperature measurement unit is used to measure the body temperature of the high-voltage cable based on the body temperature measurement unit and provide the location information of the body temperature measurement unit. The body temperature of the high-voltage cable includes the point temperature or the line temperature of the high-voltage cable body. The point temperature of the high-voltage cable body is measured and obtained by a fiber optic grating temperature sensor, and the line temperature of the high-voltage cable body is measured and obtained by a distributed fiber optic temperature sensor.

[0090] The infrared thermal imaging unit is used to acquire thermal images of the high-voltage cable within the monitoring area and provide the location information of the infrared thermal imaging unit. It is also used to measure the temperature of the high-voltage cable body based on the infrared thermal imaging unit and the temperature at the location of the channel ambient temperature unit. The channel ambient temperature unit is used to measure the ambient temperature of the high-voltage cable channel at its installation location and provide the location information of the channel ambient temperature unit.

[0091] The body temperature measurement unit is installed on the surface of the outer sheath of the high-voltage cable. In this embodiment, the body temperature measurement unit includes 10 fiber optic temperature sensors. The fiber optic temperature sensors are installed at equal intervals in the circumferential direction of the cable. Each fiber optic temperature sensor is designed with 1,000 temperature sensing gratings, and the measurement starts from the middle joint as the starting position.

[0092] The infrared thermal imaging unit is installed on the top track of the channel; the channel ambient temperature unit is installed on the channel wall or on the cable bracket inside the channel and does not directly contact the cable body. Typical channel ambient temperature units use industrial mercury thermometers, temperature elements, surface acoustic wave temperature elements, etc.

[0093] The high-voltage cable includes a conductor 11, a conductor shielding layer 12, an insulation layer 13, an insulation shielding layer 14, a buffer layer 15, a first outer sheath 16, and a second outer sheath 17, as follows: Figure 5 As shown; the first outer sheath 16 is preferably a corrugated aluminum sheath;

[0094] In the above technical solution, the specific implementation method of the temperature information extraction module 2 extracting the length of the heating area, the hot spot temperature, and the reference temperature based on the body temperature measurement unit is as follows:

[0095] The high-voltage cable body temperature information acquired by the body temperature measurement unit in the temperature information acquisition module 1 includes (L) i ,T i ), i = 0, 1, 2, ..., n, L represents the length of the high-voltage cable, T represents the temperature of the high-voltage cable body, i represents the ordinal number of the body temperature measurement unit, n represents the number of body temperature measurement units, L i T represents the high-voltage cable length information corresponding to the position information of the i-th body temperature measurement unit. i This represents the high-voltage cable body temperature measured by the i-th body temperature measurement unit;

[0096] The heating area extracted by the body temperature measurement unit in the temperature information acquisition module 1 is the area where the body temperature of the high-voltage cable exceeds the set threshold temperature [L]. x L y ], L x L indicates the starting point where the temperature of the high-voltage cable body exceeds the set threshold temperature. y This indicates the endpoint where the temperature of the high-voltage cable body exceeds the set threshold for the body temperature, where x and y belong to the set i;

[0097] The length ΔL of the heating area based on the body temperature measurement unit is the length of the area where the body temperature of the high-voltage cable exceeds the set threshold temperature of the body.

[0098] ΔL=|L x -L y |

[0099] In the formula, L x L indicates the starting point where the temperature of the high-voltage cable body exceeds the set threshold temperature. y This indicates the endpoint where the temperature of the high-voltage cable body exceeds the set threshold for the body temperature.

[0100] The hotspot temperature T is extracted by the body temperature measurement unit in the temperature information acquisition module 1. r L within the heating area rThe temperature of the high-voltage cable body at the location, r is the ordinal number of the hot spot temperature, x≤r≤y;

[0101] The reference temperature extracted by the body temperature measurement unit in the temperature information acquisition module 1 is the body temperature of the high-voltage cable that does not belong to the heating area.

[0102] In contrast to this invention, commonly used methods in the field include X-ray detection, partial discharge detection, and gas monitoring. Partial discharge detection involves installing sensors on the cable grounding wire, but this is only done at both ends of a cable section and cannot pinpoint the location of ablation defects. X-ray detection is limited by the cable's laying distance, and the radiation poses a health hazard. Gas monitoring requires drilling holes in the cable's metal sheath, and to locate defects without knowing their presence, numerous holes are needed, damaging the cable's structure. This invention overcomes the shortcomings of these detection methods, offering low cost, effective location capabilities, and high safety and reliability. The extraction process in this step reduces the amount of data to be analyzed, shortens defect identification time, and enables rapid defect analysis.

[0103] In the above technical solution, the hotspot analysis module 3 analyzes the temperature physical quantity information obtained by the temperature information acquisition module 1 and the heating area length, hotspot temperature, and reference temperature extracted by the temperature information extraction module 2 to obtain the maximum hotspot temperature and the reference temperature base value T. c The actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is calculated using the following method:

[0104] The analysis yields the high-voltage cable body hot spot temperature T from the temperature information extraction module 2. r Maximum value T r，max and the location L where the maximum hot spot temperature of the high-voltage cable body is located. r，max The temperature rise at the maximum hot spot temperature of the high-voltage cable body based on the body temperature measurement unit is calculated using the following formula:

[0105] ΔT=T r，max -T c

[0106] In the formula, ΔT is the temperature rise at the maximum hot spot temperature of the high-voltage cable body based on the body temperature measurement unit, and T r，max T represents the maximum hot spot temperature of the high-voltage cable body. c The reference temperature base value extracted by the body temperature measurement unit;

[0107] The specific method for obtaining the reference temperature benchmark value is as follows: compare the adjacent high-voltage cable body temperatures within the reference temperature range. Since the high-voltage cable body temperature in the heating area is constantly increasing or decreasing, within the range excluding the heating area, select the high-voltage cable body temperature with an adjacent temperature difference of 0 as the reference temperature benchmark value T. c c is the ordinal number of the reference temperature base value, where 0 < c < x or c > y.

[0108] The actual hot spot temperature rise ΔT' at the location of the maximum hot spot temperature in the high-voltage cable buffer layer based on the body temperature measurement unit is calculated using the following formula:

[0109] ΔT′=ΔT+W s R T2 +(W s +W p (R) T3 +R T4 )

[0110] In the formula, ΔT′ is the actual hot spot temperature rise at the location of the maximum hot spot temperature of the high-voltage cable buffer layer based on the body temperature measurement unit, ΔT is the temperature rise at the location of the maximum hot spot temperature of the high-voltage cable body, and W s The loss of the buffer layer 15 is expressed in W / m, R. T2 The thermal resistance of the buffer layer 15 is expressed in K·m / W. p Loss of the first outer sheath 16, in W / m, R T3 The thermal resistance of the second outer sheath 17 is expressed in K·m / W. T4 The thermal resistance of the outer medium of the second outer sheath 17 is expressed in K·m / W.

[0111] This step calculates the internal buffer ablation temperature of the first outer sheath by measuring the external temperature of the second outer sheath, thus improving the accuracy of the basic data for defect identification.

[0112] In the above technical solution, the specific implementation method of the temperature information extraction module 2 extracting the length of the heating area, the hot spot temperature, and the reference temperature based on the infrared thermal imaging unit is as follows:

[0113] Based on the high-voltage cable body temperature acquired by the infrared thermal imaging unit in the temperature information acquisition module 1, the temperature information extraction module 2 extracts the length of the heating area, the hot spot temperature, the reference temperature of the non-heating area of ​​the cable body, and the reference temperature θ at the comparison point location of the channel ambient temperature unit. b The implementation method is as follows:

[0114] First, identify the location information of the high-voltage cable body and channel ambient temperature unit in the high-voltage cable thermal image; set the starting point and ending point of the marker line along the high-voltage cable in the high-voltage cable thermal image, and calculate the marker line length 'a'; divide the marker line length 'a' into m equal parts to obtain (a j θ j ), j = 0, 1, 2.....m, a j θ represents the length of the marker line at the j-th division position. j The temperature of the high-voltage cable body based on the infrared thermal imaging unit represents the j-th division position, where j represents the division number and m represents the total number of divisions.

[0115] The length Δa of the heating area based on the infrared thermal imaging unit is the area where the temperature of the high-voltage cable body based on the infrared thermal imaging unit exceeds a set threshold for the body temperature. p a q Length of ]

[0116] Δa=k|a p -a q |

[0117] Where k is the ratio coefficient between the actual cable length and the length of the high-voltage cable body in the high-voltage cable thermal image, and a p a represents the starting point of the heating area in the thermal image of the high-voltage cable. q The endpoint of the heating area in the thermal image of the high-voltage cable is indicated by p, q, which belong to the set j.

[0118] Extracting the heating area from the thermal image of a high-voltage cable [a] p a q The hotspot temperature θ r For a r The high-voltage cable body temperature at the location based on the infrared thermal imaging unit, a r It is a fever area [a] p a q For any position in the [], p≤r≤q;

[0119] The reference temperature θ extracted by the infrared thermal imaging unit in the temperature information acquisition module 1 is based on the infrared thermal imaging unit. c The temperature of the high-voltage cable body based on the infrared thermal imaging unit is located in the area excluding the heating zone, where c is the ordinal number of the reference temperature based on the infrared thermal imaging unit, 0 < c q, as shown below. Figure 4 As shown.

[0120] The reference temperature θ at the comparison point location of the channel ambient temperature unit. b The temperature at the location of the channel ambient temperature unit, obtained by the infrared thermal imaging unit;

[0121] Furthermore, if the high-voltage cable thermal image contains multiple high-voltage cables, then the length of the heating area, the hot spot temperature, the reference temperature of the non-heating area of ​​the cable body, and the reference temperature θ of the comparison point at the location of the channel ambient temperature unit are extracted for each of the multiple high-voltage cables. b ;

[0122] In the above technical solution, the hotspot analysis module 3 calculates the actual hotspot temperature rise at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the high-voltage cable thermal image obtained by the temperature information acquisition module 1 and the length of the heating area, hotspot temperature, and reference temperature extracted by the temperature information extraction module 2. The specific implementation method is as follows:

[0123] The maximum value θ of the hot spot temperature of the high-voltage cable body is obtained from the temperature information extraction module 2. r，max and the location a of the maximum hot spot temperature of the high-voltage cable body r，max The temperature rise Δθ at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit is calculated using the following formula:

[0124] Δθ=θ r，max -θ c +T s -θ b

[0125] In the formula, Δθ represents the temperature rise at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit, and θ r，max θ represents the maximum hot spot temperature of the high-voltage cable body. b T is the reference temperature at the comparison point location of the channel ambient temperature unit. s The ambient temperature of the high-voltage cable channel at its installation location, θ, is obtained by the channel ambient temperature unit. c This is the reference temperature for the non-heat-generating area of ​​the cable body.

[0126] The actual hotspot temperature rise Δθ' at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the infrared thermal imaging unit is calculated using the following formula:

[0127] Δθ'=Δθ+W s R T2 +(W s +W p (R) T3 +R T4 )

[0128] In the formula, Δθ' is the actual hot spot temperature rise at the location of the maximum hot spot temperature of the high-voltage cable buffer layer based on the infrared thermal imaging unit, Δθ is the temperature rise at the location of the maximum hot spot temperature of the high-voltage cable body, and W s The loss of the buffer layer 15 is expressed in W / m.p Loss of the first outer sheath 16, in W / m, R T2 The thermal resistance of the buffer layer 15 is expressed in K-bit units, R. T3 The thermal resistance of the second outer sheath 17 is given in K-position, R. T4 The outer thermal resistance of the second outer sheath 17 is expressed in KJ / W.

[0129] In the above technical solution, the defect identification module 4 performs defect identification and defect type identification, specifically as follows:

[0130] The defect identification module 4 identifies ablation defects in the high-voltage cable buffer layer. Specifically, when the length of the heating area obtained by the temperature information extraction module 2 is less than the length of the cable segment being tested and is not in the intermediate joint or cable terminal area, it is determined that there is a defect in the high-voltage cable buffer layer. According to engineering experience, typically, the length of the continuous heating area caused by the buffer layer defect is less than 10m.

[0131] The defect identification module 4 performs defect severity analysis. Specifically, it identifies the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer according to the severity identification rules.

[0132] In the above technical solution, the severity identification rule is: when the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is greater than or equal to ΔT. w1 Less than or equal to △T w2 At that time, the severity of the ablation defect is considered moderate. When the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer exceeds ΔT... w2 Less than or equal to △T w3 At that time, the severity of the ablation defect is noted as follows: when the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is greater than ΔT... w3 At that time, the severity of the ablation defect was severe, ΔT w1 <△T w2 <△T w3 .

[0133] Based on experimental research results and engineering experience, △T w1 The preferred temperature is 0.2℃, ΔT w2 The preferred temperature is 0.5℃, ΔT w3 The preferred temperature is 2℃.

[0134] This invention uses a temperature rise threshold to identify defect types. The method is simple and effective, avoiding the introduction of complex algorithms that would increase computational difficulty.

[0135] The cable buffer layer ablation hotspot detection device also includes a display and alarm module 5:

[0136] The display alarm module 5 is used to display the diagnostic results obtained by the defect identification module 4, and to issue alarms regarding whether there are defects in the high-voltage cable buffer layer, the location of the defects, and the degree of defects.

[0137] Example 2:

[0138] A method for detecting ablation hotspots in a cable buffer layer based on a body temperature measurement unit, comprising the following steps:

[0139] Step 1: Obtain several temperature physical quantities of the high-voltage cable through sensors;

[0140] Step 2: Extract the heating area, heating area length, hot spot temperature, and reference temperature based on the temperature physical quantity information;

[0141] The temperature information acquired by the body temperature measurement unit includes the high-voltage cable body temperature (L). i ,T i ), i = 1, 2, ..., n, L represents the length of the high-voltage cable, T represents the temperature of the high-voltage cable body, i represents the ordinal number of the body temperature measurement unit, n represents the number of body temperature measurement units, L i T represents the high-voltage cable length information corresponding to the position information of the i-th body temperature measurement unit. i This represents the high-voltage cable body temperature measured by the i-th body temperature measurement unit;

[0142] The heating area extracted by the body temperature measurement unit in the temperature information acquisition module 1 is the area where the high-voltage cable body temperature exceeds the set body temperature threshold. x ~L y L x L indicates the starting point where the temperature of the high-voltage cable body exceeds the set threshold temperature. y This indicates the endpoint where the temperature of the high-voltage cable body exceeds the set threshold for the body temperature, where x and y belong to the set i;

[0143] The hotspot temperature T is extracted by the body temperature measurement unit in the temperature information acquisition module 1. r L within the heating area r The temperature of the high-voltage cable body at the location, r is the ordinal number of the hot spot temperature, x≤r≤y;

[0144] The reference temperature extracted by the body temperature measurement unit in the temperature information acquisition module 1 is the body temperature of the high-voltage cable that does not belong to the heating area.

[0145] In this embodiment, the total length L of the high-voltage cable monitored by the body temperature measurement unit is 100m, the spacing between two adjacent temperature sensing gratings on the same fiber Bragg grating temperature sensor is 0.1m, and the number of body temperature measurement units in this embodiment is n = 100 / 0.1 = 1000.

[0146] The heating area is defined as the region where the temperature of the high-voltage cable body exceeds a set threshold of 30.8°C. x ~L y The length is 10.5m to 11.8m, and the temperature of the high-voltage cable body (L) r T r The temperatures are (10.5m, 31.4℃), (10.6m, 31.4℃), (10.7m, 31.5℃), (10.8m, 31.5℃), (10.9m, 31.6℃), (11.0m, 31.7℃), (11.1m, 31.8℃), (11.2m, 31.7℃), (11.3m, 31.6℃), (11.4m, 31.6℃), (11.5m, 31.5℃), (11.6m, 31.5℃), (11.7m, 31.4℃), and (11.8m, 31.3℃).

[0147] The length ΔL of the heating area based on the body temperature measurement unit is the length of the area where the body temperature of the high-voltage cable exceeds the set threshold temperature of the body.

[0148] ΔL=|L x -L y |

[0149] In this embodiment, ΔL = |10.5-11.8| = 1.3m.

[0150] The hotspot temperature T is extracted by the body temperature measurement unit in the temperature information acquisition module 1. r The high-voltage cable body temperature (L) when i is 105~118. i ,T i Specifically, the following locations are: (10.5m, 31.4℃), (10.6m, 31.4℃), (10.7m, 31.5℃), (10.8m, 31.5℃), (10.9m, 31.6℃), (11.0m, 31.7℃), (11.1m, 31.8℃), (11.2m, 31.7℃), (11.3m, 31.6℃), (11.4m, 31.6℃), (11.5m, 31.5℃), (11.6m, 31.5℃), (11.7m, 31.4℃), and (11.8m, 31.3℃).

[0151] The reference temperature extracted by the body temperature measurement unit in the temperature information acquisition module 1 is the high-voltage cable body temperature (L) when i is 1~104 and 119~1000. i ,T i In this embodiment, T i The temperature was 30.8℃.

[0152] Step 3: Based on the temperature physical quantity information, the heating area, the length of the heating area, the hot spot temperature, and the reference temperature, analyze and obtain the maximum hot spot temperature and the reference temperature baseline value T. c Calculate the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer;

[0153] Based on the temperature physical quantity information obtained by the hotspot analysis module 3 through the temperature information acquisition module 1, and the heating area length, hotspot temperature, and reference temperature extracted by the temperature information extraction module 2, the maximum hotspot temperature and the reference temperature baseline value T are analyzed and obtained. c The actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer, based on the body temperature measurement unit, is calculated using the following method:

[0154] The hotspot temperature T in the temperature information extraction module 2 is obtained through analysis. r Maximum value T r,max and the location L where the maximum hot spot temperature of the high-voltage cable body is located. r,max In this embodiment, T r,max The temperature was 31.8℃, L r,max It is 11.1m;

[0155] The specific method for obtaining the reference temperature benchmark value is as follows: compare the adjacent high-voltage cable body temperatures within the reference temperature range. Since the high-voltage cable body temperature in the heating area is constantly increasing or decreasing, within the range excluding the heating area, select the high-voltage cable body temperature with an adjacent temperature difference of 0 as the reference temperature benchmark value T. c c is the ordinal number of the reference temperature base value, 0 < c < x or c > y. In this embodiment, the reference temperature base value is T. c The temperature was 30.8℃.

[0156] The temperature rise at the maximum hot spot temperature of the high-voltage cable body, based on the body temperature measurement unit, is calculated using the following formula:

[0157] ΔT=T r，max -T c =31.8℃ - 30.8℃ = 1℃

[0158] In the formula, ΔT is the temperature rise at the maximum hot spot temperature of the high-voltage cable body based on the body temperature measurement unit, and T r，max T represents the maximum hot spot temperature of the high-voltage cable body. c The reference temperature base value extracted by the body temperature measurement unit;

[0159] The actual hot spot temperature rise ΔT' at the location of the maximum hot spot temperature in the high-voltage cable buffer layer based on the body temperature measurement unit is calculated using the following formula:

[0160] ΔT′=ΔT+W s R T2 +(W s +W p (R) T3 +R T4 )

[0161] In this embodiment, ΔT′=1+0.065×0.0722+(0.065+0.425)×(1.942+0.731)=1+0.004693+1.30977=2.314463.

[0162] Step 4: Identify the defect type and severity and output the results.

[0163] The length of the heating area is 1.3m, which is less than the length of the cable segment being tested (100m), and it is not located in the intermediate joint or cable terminal area.

[0164] The actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is 2.314463℃, which is greater than ΔT. w3 According to the severity identification rules, its status is classified as severe.

[0165] The alarm module 5 shows that there is a serious ablation defect in the cable buffer layer at 10.5m-11.8m, with the hottest spot located at 11.1m. The defect caused the temperature of the hot spot in the buffer layer to rise by 2.314463℃.

[0166] Example 3:

[0167] A method for detecting ablation hotspots in cable buffer layers based on infrared thermal imaging units, such as Figure 3 and Figure 4 As shown, it includes the following steps:

[0168] Step 1: Obtain several temperature physical quantities of the high-voltage cable through sensors;

[0169] Step 2: Extract the heating area, heating area length, hot spot temperature, and reference temperature based on the temperature physical quantity information;

[0170] In the above technical solution, the specific implementation method of the temperature information extraction module 2 extracting the length of the heating area, the hot spot temperature, and the reference temperature based on the infrared thermal imaging unit is as follows:

[0171] Based on the high-voltage cable body temperature acquired by the infrared thermal imaging unit in the temperature information acquisition module 1, the temperature information extraction module 2 extracts the length of the heating area, the hot spot temperature, the reference temperature of the non-heating area of ​​the cable body, and the reference temperature θ at the comparison point location of the channel ambient temperature unit. b The implementation method is as follows:

[0172] First, identify the location information of the high-voltage cable body and channel ambient temperature unit in the high-voltage cable thermal image; then, set the starting point and ending point of the marker line along the high-voltage cable in the high-voltage cable thermal image, and calculate the marker line length 'a'; finally, divide the marker line length 'a' into n equal parts to obtain (a j θ j ), j = 0, 1, 2.....m, a j θ represents the length of the marker line at the j-th division position. j The temperature of the high-voltage cable body based on the infrared thermal imaging unit represents the j-th division position, where j represents the division number and m represents the total number of divisions.

[0173] The length Δa of the heating area based on the infrared thermal imaging unit is the area where the temperature of the high-voltage cable body based on the infrared thermal imaging unit exceeds a set threshold for the body temperature. p a q Length of ]

[0174] Δa=k|a p -a q |

[0175] Where k is the ratio coefficient between the actual cable length and the length of the high-voltage cable body in the high-voltage cable thermal image, and a p a represents the starting point of the heating area in the thermal image of the high-voltage cable. q This indicates the endpoint of the heating area in the thermal image of the high-voltage cable, where p and q belong to the set j. In this embodiment, k is 200, and Δa = 200|1.2-1.6| = 80cm = 0.8m;

[0176] Extracting the heating area from the thermal image of a high-voltage cable [a] p a q The hotspot temperature θ r For a r The high-voltage cable body temperature at the location based on the infrared thermal imaging unit, a r It is a fever area [a] p a q For any position in the [], p≤r≤q;

[0177] The reference temperature θ extracted by the infrared thermal imaging unit in the temperature information acquisition module 1 is based on the infrared thermal imaging unit. c The temperature of the high-voltage cable body based on the infrared thermal imaging unit is located in the area excluding the heating zone, where c is the ordinal number of the reference temperature based on the infrared thermal imaging unit, 0 < c q, as shown below. Figure 4 As shown.

[0178] The reference temperature θ at the comparison point location of the channel ambient temperature unit. b The temperature at the location of the channel ambient temperature unit, obtained by the infrared thermal imaging unit;

[0179] Furthermore, if the high-voltage cable thermal image contains multiple high-voltage cables, then the length of the heating area, the hot spot temperature, the reference temperature of the non-heating area of ​​the cable body, and the reference temperature θ of the comparison point at the location of the channel ambient temperature unit are extracted for each of the multiple high-voltage cables. b ;

[0180] In this embodiment, 'a' is 10cm. The length of the marking line is divided into 100 equal parts to obtain (a) i θ i When i = 100, and i is 1~11 and 16~100, θ i Both are 8.1℃, and when i is 12–15, (a i θ i The values ​​are (1.2, 8.2), (1.3, 8.4), (1.4, 8.6), (1.5, 8.4), and (1.6, 8.2), respectively; the reference temperature θ at the comparison point of the channel ambient temperature unit location. b It was 7.9℃;

[0181] In this embodiment, the reference temperature θ is extracted based on the infrared thermal imaging unit in the temperature information acquisition module 1. c The extracted heating area is the region where the temperature of the high-voltage cable body exceeds the set threshold of 8.1℃. p ~a q The value is 1.2cm to 1.6cm, (a i θ i The values ​​are (1.2cm, 8.2℃), (1.3cm, 8.4℃), (1.4cm, 8.6℃), (1.5cm, 8.4℃), and (1.6cm, 8.2℃), respectively.

[0182] Step 3: Based on the temperature physical quantity information, the heating area, the hot spot temperature, and the reference temperature, analyze and obtain the maximum hot spot temperature and the reference temperature baseline value T. cCalculate the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer;

[0183] In the above technical solution, the hotspot analysis module 3 calculates the actual hotspot temperature rise at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the high-voltage cable thermal image obtained by the temperature information acquisition module 1 and the length of the heating area, hotspot temperature, and reference temperature extracted by the temperature information extraction module 2. The specific implementation method is as follows:

[0184] The maximum value θ of the hot spot temperature of the high-voltage cable body is obtained from the temperature information extraction module 2. r，max and the location a of the maximum hot spot temperature of the high-voltage cable body r，max The temperature rise Δθ at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit is calculated using the following formula:

[0185] Δθ=θ r，max -θ c +T s -θ b

[0186] In the formula, Δθ represents the temperature rise at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit, and θ r，max θ represents the maximum temperature of the hot spot in the high-voltage cable thermal image. b T is the reference temperature at the comparison point location of the channel ambient temperature unit. s The ambient temperature of the high-voltage cable channel at its installation location, θ, is obtained by the channel ambient temperature unit. c This is the reference temperature for the non-heat-generating area of ​​the cable body.

[0187] The ambient temperature T of the high-voltage cable channel at its installation location is obtained by the channel ambient temperature unit described in this embodiment. s If the temperature is 7.93℃, then Δθ = 8.6 - 8.1 + 7.93 - 7.9 = 0.53℃;

[0188] The actual hotspot temperature rise Δθ' at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the infrared thermal imaging unit is calculated using the following formula:

[0189] Δθ'=Δθ+W s R T2 +(W s +W p (R) T3 +R T4 )

[0190] In this embodiment, Δθ' = 0.53 + 0.065 × 0.0722 + (0.065 + 0.425) × (1.942 + 0.731) = 0.53 + 0.004693 + 1.30977 = 0.53 + 1.314463 = 1.844463℃;

[0191] Step 4: Identify the defect type and severity and output the results.

[0192] The length of the heating area is 0.8m, which is less than the length of the cable segment being tested (100m), and it is not located in the intermediate joint or cable terminal area.

[0193] The actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is 1.844463℃, which is greater than ΔT. w2 And less than ΔT w3 According to the severity identification rules, its status is classified as severe.

[0194] The alarm module 5 shows that there is a serious ablation defect in the cable buffer layer at a distance of 2.4m-3.2m, with the hottest spot located at 2.8m. The temperature rise of the hot spot in the buffer layer caused by the defect is 1.844463℃.

[0195] Example 4:

[0196] An electronic device is characterized in that it comprises: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the above-described detection method for the cable buffer layer ablation hotspot device.

[0197] Example 5:

[0198] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the detection method for the cable buffer layer ablation hotspot device described above.

[0199] The contents not described in detail in this specification are prior art known to those skilled in the art. Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0200] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0201] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0202] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0203] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A device for detecting hot spots of cable buffer layer erosion, characterized in that: It includes a temperature information acquisition module (1), a temperature information extraction module (2), and a hotspot analysis module (3): The temperature information acquisition module (1) is used to acquire several temperature physical quantities of the high-voltage cable through a sensor. The temperature physical quantities are the temperature of the high-voltage cable body and the position information of the temperature information acquisition module (1). The temperature information extraction module (2) is used to extract the temperature physical quantity information obtained by the temperature information acquisition module (1), and extract the heating area, heating area length, hot spot temperature and reference temperature. The heating area is the area where the temperature of the high voltage cable body exceeds the set threshold of the body temperature. The hot spot analysis module (3) is used to calculate the actual hot spot temperature rise at the location of the maximum hot spot temperature of the high voltage cable buffer layer by using the temperature physical quantity information obtained by the temperature information acquisition module (1) and the length of the heating area, hot spot temperature and reference temperature extracted by the temperature information extraction module (2). The temperature information acquisition module (1) includes a body temperature measurement unit or an infrared thermal imaging unit; The actual hot spot temperature rise ΔT' at the location of the maximum hot spot temperature in the high-voltage cable buffer layer based on the body temperature measurement unit is calculated using the following formula: + In the formula, This refers to the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer, based on the body temperature measurement unit. This refers to the temperature rise at the maximum hot spot temperature of the high-voltage cable body. For the loss of the buffer layer (15), For the loss of the first outer sheath (16), For the thermal resistance of the buffer layer (15), For the thermal resistance of the second outer sheath (17), The outer medium thermal resistance of the second outer sheath (17); The actual hotspot temperature rise Δ at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the infrared thermal imaging unit is calculated using the following formula. ': △ ’= + In the formula, △ 'This refers to the actual hotspot temperature rise at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the infrared thermal imaging unit.' The temperature rise is the maximum temperature rise at the hot spot of the high-voltage cable body calculated in the temperature information extraction module (2).

2. The cable buffer layer ablation hotspot detection device according to claim 1, characterized in that: When the temperature information acquisition module (1) uses an infrared thermal imaging unit, it should also include a channel ambient temperature unit; The body temperature measurement unit is used to measure the body temperature of the high-voltage cable based on the body temperature measurement unit and to provide the location information of the body temperature measurement unit; The infrared thermal imaging unit is used to acquire thermal images of the high-voltage cable within the monitoring area and provide the location information of the infrared thermal imaging unit. It is also used to measure the temperature of the high-voltage cable body and the temperature at the location of the channel ambient temperature unit based on the infrared thermal imaging unit. The channel ambient temperature unit is used to measure the ambient temperature of the high-voltage cable channel at its installation location.

3. The cable buffer layer ablation hotspot detection device according to claim 2, characterized in that: The temperature information extraction module (2) extracts the length of the heating area, the hot spot temperature, and the reference temperature based on the temperature physical quantity information obtained by the body temperature measurement unit in the temperature information acquisition module (1). The specific method is as follows: The high-voltage cable body temperature information acquired by the body temperature measurement unit in the temperature information acquisition module (1) includes (L i ,T i (i = 0, 1, 2, ..., n), where L represents the length of the high-voltage cable, T represents the temperature of the high-voltage cable body, i represents the ordinal number of the body temperature measurement unit, and n represents the number of body temperature measurement units. i T represents the high-voltage cable length information corresponding to the position information of the i-th body temperature measurement unit. i This represents the high-voltage cable body temperature measured by the i-th body temperature measurement unit; The heating area extracted by the body temperature measurement unit in the temperature information acquisition module (1) is the area L where the body temperature of the high-voltage cable exceeds the set threshold of the body temperature. x ~L y L x L indicates the starting point where the temperature of the high-voltage cable body exceeds the set threshold temperature. y This indicates the endpoint where the temperature of the high-voltage cable body exceeds the set threshold for the body temperature, where x and y belong to the set i. Length of the heating area based on the body temperature measurement unit The length of the region where the temperature of the high-voltage cable body exceeds a set threshold: The hot spot temperature T is extracted by the body temperature measurement unit in the temperature information acquisition module (1). r L within the heating area r The temperature of the high-voltage cable body at the location, r is the ordinal number of the hot spot temperature, x≤r≤y; The reference temperature extracted by the body temperature measurement unit in the temperature information acquisition module (1) is the body temperature of the high-voltage cable that does not belong to the heating area.

4. The cable buffer layer ablation hotspot detection device according to claim 3, characterized in that: The hotspot analysis module (3) calculates the actual hotspot temperature rise at the location of the maximum hotspot temperature in the high-voltage cable buffer layer by using the temperature physical quantity information obtained by the temperature information acquisition module (1) and the length of the heating area, hotspot temperature, and reference temperature extracted by the temperature information extraction module (2). The specific method is as follows: The maximum value T of the hotspot temperature in the temperature information extraction module (2) is obtained through analysis. r,max and the location L where the maximum hot spot temperature of the high-voltage cable body is located. r,max The temperature rise at the maximum hot spot temperature of the high-voltage cable body, based on the body temperature measurement unit, is calculated using the following formula: △T=T r,max -T c In the formula, △T is the temperature rise at the maximum value of the hot spot temperature of the high-voltage cable body based on the body temperature measurement unit, and T r,max T represents the maximum hot spot temperature of the high-voltage cable body. c The reference temperature base value extracted by the body temperature measurement unit; The specific method for obtaining the reference temperature benchmark value is as follows: compare the adjacent high-voltage cable body temperatures within the reference temperature range, and select the high-voltage cable body temperature with an adjacent temperature difference of 0 within the range excluding the heating area as the reference temperature benchmark value T. c c is the ordinal number of the reference temperature base value, where 0 < c < x or c > y.

5. The cable buffer layer ablation hotspot detection device according to claim 2, characterized in that: The temperature information extraction module (2) extracts the length of the heating area, the hot spot temperature, and the reference temperature based on the infrared thermal imaging unit. The specific method is as follows: The temperature information extraction module (2) extracts the length of the heating area, the hot spot temperature, and the reference temperature θ of the non-heating area of ​​the cable body based on the high-voltage cable body temperature obtained by the infrared thermal imaging unit in the temperature information acquisition module (1). c The reference temperature θ at the comparison point with the ambient temperature unit location in the channel b The implementation method is as follows: First, identify the location information of the high-voltage cable body and channel ambient temperature unit in the high-voltage cable thermal image; set the starting point and ending point of the marker line along the high-voltage cable in the high-voltage cable thermal image, and calculate the marker line length a; divide the marker line length a into m equal parts to obtain (a j, θ j ), j=0,1,2.....m, a j θ represents the length of the marker line at the j-th division position. j The temperature of the high-voltage cable body based on the infrared thermal imaging unit represents the j-th division position, where j represents the division number and m represents the total number of divisions. Heating area length based on infrared thermal imaging unit The area where the temperature of the high-voltage cable body, based on the infrared thermal imaging unit, exceeds a set threshold temperature [a] p ,a q The calculation yielded the following: Where k is the ratio coefficient between the actual cable length and the length of the high-voltage cable body in the high-voltage cable thermal image. a represents the starting point of the heating area in the thermal image of the high-voltage cable. q The endpoint of the heating area in the thermal image of the high-voltage cable is indicated by p, q, which belong to the set j. Extracting the heating area from the thermal image of a high-voltage cable [a] p ,a q The hotspot temperature θ r for The temperature of the high-voltage cable body at the location corresponding to the infrared thermal imaging unit. It is a fever area [a] p ,a q For any position in the [], p≤r≤q; The reference temperature θ extracted by the infrared thermal imaging unit in the temperature information acquisition module (1) is based on the infrared thermal imaging unit. c The temperature of the high-voltage cable body based on the infrared thermal imaging unit is located in the area excluding the heating area, and c is the ordinal number of the reference temperature based on the infrared thermal imaging unit, where 0 < c q. The reference temperature θ at the comparison point location of the channel ambient temperature unit. b The temperature at the location of the channel ambient temperature unit, obtained by the infrared thermal imaging unit; If a high-voltage cable thermal image contains multiple high-voltage cables, then the length of the heating zone, the hot spot temperature, and the reference temperature θ of the non-heating zone of the cable body should be extracted for each high-voltage cable. c The reference temperature θ at the comparison point with the ambient temperature unit location in the channel b .

6. The cable buffer layer ablation hotspot detection device according to claim 5, characterized in that: The hotspot analysis module (3) calculates the actual hotspot temperature rise at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the high-voltage cable thermal image obtained by the temperature information acquisition module (1) and the length of the heating area, hotspot temperature, and reference temperature extracted by the temperature information extraction module (2). The specific method is as follows: The hotspot analysis module (3) analyzes and obtains the maximum hotspot temperature θ of the high-voltage cable body from the temperature information extraction module (2). r,max and the location a of the maximum hot spot temperature of the high-voltage cable body r,max The temperature rise Δθ at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit is calculated using the following formula: △θ=θ r,max -θ c + In the formula, This refers to the temperature rise at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit. This represents the maximum temperature of the hot spot in the high-voltage cable thermal image. This is the reference temperature at the comparison point location of the channel ambient temperature unit. θ is the ambient temperature of the high-voltage cable channel at its installation location, obtained by the channel ambient temperature unit. c This is the reference temperature for the non-heat-generating area of ​​the cable body.

7. The cable buffer layer ablation hotspot detection device according to claim 1, characterized in that: It also includes a defect identification module (4); The defect identification module (4) is used to identify the defect type and severity and output the results based on the length of the heating area, the hot spot temperature and the reference temperature extracted by the temperature information extraction module (2) and the actual hot spot temperature rise at the location of the maximum hot spot temperature of the high voltage cable buffer layer calculated by the hot spot analysis module (3).

8. The cable buffer layer ablation hotspot detection device according to claim 7, characterized in that: The defect identification module (4) performs defect identification and defect type identification, specifically as follows: The defect identification module (4) identifies the ablation defect of the high-voltage cable buffer layer. The specific method is as follows: when the length of the heating area obtained by the temperature information extraction module (2) is less than the length of the cable segment being tested, and is not in the intermediate joint or cable terminal area, it is determined that there is a defect in the high-voltage cable buffer layer. The defect identification module (4) performs defect severity analysis. The specific method is to identify the actual hot spot temperature rise at the location of the maximum hot spot temperature of the high voltage cable buffer layer according to the severity identification rules.

9. The cable buffer layer ablation hotspot detection device according to claim 8, characterized in that: The severity identification rule is as follows: when the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is greater than or equal to T... w1 Less than or equal to T w2 At that time, the severity of the ablation defect is moderate, and the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is greater than T. w2 Less than or equal to T w3 At that time, the severity of the ablation defect is noted as follows: when the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is greater than T... w3 At that time, the severity of the ablation defect was severe, T w1 <T w2 <T w3 .

10. The cable buffer layer ablation hotspot detection device according to claim 7, characterized in that: It also includes an alarm display module (5): The display alarm module (5) is used to display the diagnostic results obtained by the defect identification module (4) and to issue alarms on whether there are defects in the high-voltage cable buffer layer, the location of the defects, and the degree of defects.

11. A method for detecting hot spots caused by ablation of the high-voltage cable buffer layer as described in claim 1, characterized in that: It includes the following steps: Several temperature-related physical quantities of the high-voltage cable are obtained through sensors; Based on the temperature physical quantity information, the heating area, heating area length, hot spot temperature, and reference temperature are extracted; Based on the temperature physical quantity information, the length of the heating area, the hot spot temperature, and the reference temperature, the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is calculated.

12. The detection method according to claim 11, characterized in that: The sensor includes a body temperature measurement unit or an infrared thermal imaging unit. When an infrared thermal imaging unit is used, it should also include a channel ambient temperature unit. The body temperature measurement unit is used to measure the body temperature of the high-voltage cable based on the body temperature measurement unit and to provide the location information of the body temperature measurement unit; The infrared thermal imaging unit is used to acquire thermal images of the high-voltage cable within the monitoring area and provide the location information of the infrared thermal imaging unit. It is also used to measure the temperature of the high-voltage cable body and the temperature at the location of the channel ambient temperature unit based on the infrared thermal imaging unit. The channel ambient temperature unit is used to measure the ambient temperature of the high-voltage cable channel at its installation location.

13. The detection method according to claim 12, characterized in that: Based on the temperature physical quantity information obtained from the body temperature measurement unit, the length of the heating area, the hot spot temperature, and the reference temperature are extracted. The specific method is as follows: The high-voltage cable body temperature information acquired by the body temperature measurement unit includes (L) i ,T i (i = 0, 1, 2, ..., n), where L represents the length of the high-voltage cable, T represents the temperature of the high-voltage cable body, i represents the ordinal number of the body temperature measurement unit, and n represents the number of body temperature measurement units. i T represents the high-voltage cable length information corresponding to the position information of the i-th body temperature measurement unit. i This represents the high-voltage cable body temperature measured by the i-th body temperature measurement unit; The heating area extracted by the body temperature measurement unit is the region L where the body temperature of the high-voltage cable exceeds the set body temperature threshold. x ~L y L x L indicates the starting point where the temperature of the high-voltage cable body exceeds the set threshold temperature. y This indicates the endpoint where the temperature of the high-voltage cable body exceeds the set threshold for the body temperature, where x and y belong to the set i. Length of the heating area based on the body temperature measurement unit The length of the region where the temperature of the high-voltage cable body exceeds a set threshold: The hotspot temperature T extracted based on the body temperature measurement unit r L within the heating area r The temperature of the high-voltage cable body at the location, r is the ordinal number of the hot spot temperature, x≤r≤y; The reference temperature extracted by the body temperature measurement unit is the body temperature of the high-voltage cable that does not belong to the heating zone.

14. The detection method according to claim 13, characterized in that: The extracted length of the heating area, hotspot temperature, and reference temperature are used to calculate the actual hotspot temperature rise at the location of the maximum hotspot temperature in the high-voltage cable buffer layer. The specific method is as follows: The maximum temperature T of the hotspot was obtained through analysis. r,max and the location L where the maximum hot spot temperature of the high-voltage cable body is located. r,max The temperature rise at the maximum hot spot temperature of the high-voltage cable body, based on the body temperature measurement unit, is calculated using the following formula: △T=T r,max -T c In the formula, △T is the temperature rise at the maximum value of the hot spot temperature of the high-voltage cable body based on the body temperature measurement unit, and T r,max T represents the maximum hot spot temperature of the high-voltage cable body. c The reference temperature base value extracted by the body temperature measurement unit; The specific method for obtaining the reference temperature benchmark value is as follows: compare the adjacent high-voltage cable body temperatures within the reference temperature range, and select the high-voltage cable body temperature with an adjacent temperature difference of 0 within the range excluding the heating area as the reference temperature benchmark value T. c c is the ordinal number of the reference temperature base value, 0 < c < x or c > y; The actual hot spot temperature rise ΔT' at the location of the maximum hot spot temperature in the high-voltage cable buffer layer based on the body temperature measurement unit is calculated using the following formula: + In the formula, This refers to the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer, based on the body temperature measurement unit. This refers to the temperature rise at the maximum hot spot temperature of the high-voltage cable body. For the loss of the buffer layer (15), For the loss of the first outer sheath (16), For the thermal resistance of the buffer layer (15), For the thermal resistance of the second outer sheath (17), The outer medium thermal resistance of the second outer sheath (17) is the outermost medium.

15. The detection method according to claim 12, characterized in that: The method for extracting the length of the heating region, the hot spot temperature, and the reference temperature based on the infrared thermal imaging unit is as follows: Based on the high-voltage cable body temperature obtained by the infrared thermal imaging unit, the length of the heating area, the hot spot temperature, and the reference temperature θ of the non-heating area of ​​the cable body are extracted. c The reference temperature θ at the comparison point with the ambient temperature unit location in the channel b The implementation method is as follows: First, identify the location information of the high-voltage cable body and channel ambient temperature unit in the high-voltage cable thermal image; set the starting point and ending point of the marker line along the high-voltage cable in the high-voltage cable thermal image, and calculate the marker line length a; divide the marker line length a into m equal parts to obtain (a j, θ j ), j=0,1,2.....m, a j θ represents the length of the marker line at the j-th division position. j The temperature of the high-voltage cable body based on the infrared thermal imaging unit represents the j-th division position, where j represents the division number and m represents the total number of divisions. Heating area length based on infrared thermal imaging unit The area where the temperature of the high-voltage cable body, based on the infrared thermal imaging unit, exceeds a set threshold temperature [a] p ,a q The calculation yielded the following: Where k is the ratio coefficient between the actual cable length and the length of the high-voltage cable body in the high-voltage cable thermal image. a represents the starting point of the heating area in the thermal image of the high-voltage cable. q The endpoint of the heating area in the thermal image of the high-voltage cable is indicated by p, q, which belong to the set j. Extracting the heating area from the thermal image of a high-voltage cable [a] p ,a q The hotspot temperature θ r for The temperature of the high-voltage cable body at the location corresponding to the infrared thermal imaging unit. It is a fever area [a] p ,a q For any position in the [], p≤r≤q; The reference temperature θ extracted based on the infrared thermal imaging unit. c The temperature of the high-voltage cable body based on the infrared thermal imaging unit is located in the area excluding the heating area, and c is the ordinal number of the reference temperature based on the infrared thermal imaging unit, where 0 < c q. The reference temperature θ at the comparison point location of the channel ambient temperature unit. b The temperature at the location of the channel ambient temperature unit, obtained by the infrared thermal imaging unit; If a high-voltage cable thermal image contains multiple high-voltage cables, then the length of the heating zone, the hot spot temperature, and the reference temperature θ of the non-heating zone of the cable body should be extracted for each high-voltage cable. c The reference temperature θ at the comparison point with the ambient temperature unit location in the channel b .

16. The detection method according to claim 15, characterized in that: Based on the length of the heating area, the hot spot temperature, and the reference temperature extracted from the thermal image of the high-voltage cable, the actual hot spot temperature rise at the location of the maximum hot spot temperature in the high-voltage cable buffer layer is calculated. The specific method is as follows: The maximum hot spot temperature θ of the high-voltage cable body was obtained through analysis. r,max and the location a of the maximum hot spot temperature of the high-voltage cable body r,max The temperature rise Δθ at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit is calculated using the following formula. △θ=θ r,max -θ c + In the formula, This refers to the temperature rise at the maximum hotspot temperature of the high-voltage cable body based on the infrared thermal imaging unit. This represents the maximum temperature of the hot spot in the high-voltage cable thermal image. This is the reference temperature at the comparison point location of the channel ambient temperature unit. θ is the ambient temperature of the high-voltage cable channel at its installation location, obtained by the channel ambient temperature unit. c This is the reference temperature for the non-heat-generating area of ​​the cable body. The actual hotspot temperature rise Δ at the location of the maximum hotspot temperature in the high-voltage cable buffer layer based on the infrared thermal imaging unit is calculated using the following formula. ' △ ’= + In the formula, △ ' The actual hotspot temperature rise at the location of the maximum hotspot temperature in the high-voltage cable buffer layer of the infrared thermal imaging unit. The temperature rise at the maximum value of the hot spot temperature of the high-voltage cable body calculated by the temperature information extraction module (2) For the loss of the buffer layer (15), For the loss of the first outer sheath (16), For the thermal resistance of the buffer layer (15), For the thermal resistance of the second outer sheath (17), The thermal resistance of the medium surrounding the high-voltage cable.

17. An electronic device, characterized in that, include: The device includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the detection method of the cable buffer layer ablation hotspot device as described in any one of claims 11-16.

18. A computer-readable medium storing a computer program that, when executed, performs a detection method for a cable buffer layer ablation hotspot device as described in any one of claims 11-16.

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