Transformer non-contact fire detection system and method

Abstract

The invention discloses a non-contact fire detection system for a transformer. The non-contact fire detection system comprises a plurality of image fire detectors and a linear multi-point fire detector, the image fire detector is used for acquiring image data of the transformer; the linear multi-point fire detector comprises a plurality of acquisition parts, and each acquisition part comprises an infrared temperature sensor array, a microprocessor, a longitudinal and power signal conversion circuit and a longitudinal signal answering circuit which are integrated into a whole. The infrared temperature sensor array is in communication connection with the microprocessor; an address is stored in the microprocessor; the plurality of acquisition parts are arranged on two sides of the transformer to form a detection point array; the detection field angle of each acquisition part corresponds to a specific area of the transformer, and the detection field angles of the plurality of acquisition parts cover the two sides and the top of the transformer. The acquisition part adopts an infrared temperature sensor array, transverse and longitudinal two-dimensional detection visual angles can be realized, a plurality of acquisition parts are arranged in an array, the transformer is divided into a plurality of detection areas, and for a microprocessor of the acquisition part, an ignition point can be quickly positioned based on the alarm acquisition part when a fire occurs, so that an accessory fire extinguishing device can be quickly started. Especially, after an image fire detector is combined, overlapped area calculation can be carried out on an alarm area, and the accuracy of the alarm condition can be distinguished.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer safety protection, in particular to a transformer non-contact fire detection system and method. BACKGROUND

[0002] At present, the transformer adopts linear temperature fire detector and point type flame detector, the linear temperature fire detector adopts contact type installation, is wound around the transformer, is fixed on the surface of the transformer body, generally adopts magnetic fixture to strongly adsorb on the surface of the body.

[0003] Intelligently upload fire state information. Constrained by the detection mechanism, the traditional linear temperature fire detector can only be wound in contact with the surface of the transformer, when the transformer explodes, the linear temperature fire detector is broken off, and even fails, so that the fire alarm cannot be realized, the fire extinguishing system cannot be started quickly, the best fire extinguishing time is delayed, and serious consequences are caused. In addition, the contact type installation method causes very inconvenient maintenance, and wastes manpower and material resources. Only when a single point type flame detector meets the set alarm condition, can a fire alarm signal be sent, multiple fire detectors do not have cooperativity, are independent individuals, cannot work cooperatively, cannot identify the fire scale and spreading trend, and the best opportunity for fire extinguishing and rescue is delayed.

[0004] In addition, the traditional linear temperature fire detector adopts contact type for large outdoor transformers, the surface temperature is higher in summer under heavy load, the contact type installed fire detector works in a high temperature environment for a long time, is easily damaged under the combination of sun and rain, fails, and sometimes even misreports the fire alarm. The transformer explosion is easy to cause one or more temperature cables to be broken by impact, cannot effectively output the fire alarm action signal, and causes the fixed fire extinguishing system to not meet the automatic starting condition.

[0005] In summary, the linear temperature fire detector and the point type flame detector can only upload the fire state information, do not have positioning function and real-time data information, and therefore cannot identify the fire scale and development and spreading situation. SUMMARY

[0006] The technical problem to be solved by the present application is how to realize non-contact positioning of the transformer fire point.

[0007] The present application realizes the above technical problems through the following technical means: The transformer non-contact fire detection system comprises a plurality of image fire detectors and a linear multi-point fire detector; the image fire detector is used to acquire image data of the transformer; the linear multi-point fire detector comprises a plurality of acquisition units, and each acquisition unit comprises an infrared temperature sensor array, a microprocessor, a longitudinal and power signal conversion circuit, and a longitudinal signal answering circuit; the longitudinal and power signal conversion circuit is connected with the two buses at the input end and connected with the microprocessor at the output end; the microprocessor is connected with the two buses through the longitudinal signal answering circuit; the infrared temperature sensor array is in communication connection with the microprocessor; the microprocessor stores an address; the plurality of acquisition units are arranged on both sides of the transformer to form an array of detection points; each acquisition unit detects a specific area of the transformer corresponding to a field of view angle, and the field of view angles of the plurality of acquisition units cover both sides and the top of the transformer; each image fire detector shoots a specific area of the transformer. The system further comprises a fire alarm controller; the fire alarm controller receives the detection data of the image fire detector and the linear multi-point fire detector; when the alarm areas of one or more acquisition units of the image fire detector and the linear multi-point fire detector overlap, it is determined that a fire occurs, and the fire position is located based on the acquisition units in the overlapping area. In the application, the acquisition unit adopts an infrared temperature sensor array, can realize two-dimensional detection angles in the horizontal and longitudinal directions, and the plurality of acquisition units are arranged in an array to divide the transformer into a plurality of detection areas. The microprocessor of the acquisition unit can quickly locate the ignition point based on the acquisition unit in the alarm area when a fire occurs, and then quickly start the accessory fire extinguishing device. Especially in combination with the image fire detector, the overlapping area of the alarm area can be calculated to distinguish the accuracy of the alarm.

[0008] Further, the plurality of acquisition units are arranged in layers in the height direction on both sides of the transformer.

[0009] Further, the uppermost layer of acquisition units is at least 100 mm higher than the top of the transformer.

[0010] Further, the distance between two adjacent acquisition units in the same layer is 1 m, and the distance between the upper and lower layers is 2 m.

[0011] Further, the infrared probes of the infrared temperature sensors in the infrared temperature sensor array are oriented differently.

[0012] Further, the infrared temperature sensor array is a 2*2 array, and the four infrared temperature sensors are oriented in four directions respectively.

[0013] Further, the welding surface of the base of the infrared temperature sensor is an inclined surface.

[0014] Further, the infrared temperature sensor is electrically welded on one side of the circuit board through the welding surface, and the microprocessor is electrically welded on the same side or the back of the circuit board.

[0015] Further, the fire monitoring and early warning platform is further included, which models and displays the transformer and the image fire detector and the linear multi-point fire detector, and divides the transformer model into regions, receives the detection data of the image fire detector and the linear multi-point fire detector, and receives the fire alarm controller, and labels the alarm region with different colors according to the detection data.

[0016] Further, the image fire detector is at least two, and is arranged at two diagonal corners of the transformer to shoot the transformer at a downward diagonal angle.

[0017] The transformer fire early warning method using the transformer non-contact fire detection system has the advantages that the multiple collection units are grouped in proximity, and the highest temperature threshold value of early warning is set; when the temperature of the monitoring area of one collection unit in the same group exceeds the threshold value, the collection unit is triggered to alarm; when the temperature of the monitoring area of the collection units in the same group does not exceed the threshold value, but the detection temperature of at least two collection units exceeds the first proportion value of the threshold value, the at least two collection units are triggered to alarm, or the detection temperature of at least three collection units exceeds the second proportion value of the threshold value, the at least three collection units are triggered to alarm; and the first proportion value is greater than the second proportion value.

[0018] The transformer fire early warning method using the transformer non-contact fire detection system has the advantages that the multiple collection units are grouped in proximity, and the highest temperature threshold value of early warning is set; when the temperature of the monitoring area of one collection unit in the same group exceeds the threshold value, the collection unit is triggered to alarm; when the temperature of the monitoring area of the collection units in the same group does not exceed the threshold value, but the detection temperature of at least two collection units exceeds the first proportion value of the threshold value, the at least two collection units are triggered to alarm, or the detection temperature of at least three collection units exceeds the second proportion value of the threshold value, the at least three collection units are triggered to alarm; and the first proportion value is greater than the second proportion value. In the present application, the collection unit adopts an infrared temperature sensor array, which can realize two-dimensional detection angles in the horizontal and vertical directions, and the multiple collection units are arranged in an array to divide the transformer into multiple detection regions. The microprocessor of the collection unit can quickly locate the ignition point based on the collection unit that alarms when a fire occurs, and then quickly start the accessory fire extinguishing device. In particular, after being combined with the image fire detector, the overlapping region of the alarm region can be calculated, and the accuracy of the alarm can be distinguished.

[0019] In addition, the visual display of the background can enable the operation and maintenance personnel to intuitively and quickly master the ignition point. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a system architecture diagram of the present application embodiment 1; Figure 2 FIG. 2 is a structural schematic diagram of the collection unit and the control component in the present application embodiment 1; Figure 3 FIG. 3 is a layered deployment schematic diagram of the collection unit in the present application embodiment 1; Figure 4 FIG. 4 is a schematic diagram of the collection unit arranged on the transformer peripheral fire branch pipe in the present application embodiment 1; the yellow color in the figure is the collection unit; Figure 5 FIG. 5 is a mounting interval calculation schematic diagram of the collection unit in the present application embodiment 1; Figure 6This is a schematic diagram of the infrared temperature sensor array inside the acquisition unit in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of a fault in the acquisition unit in Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of a fault in the connection line between the acquisition units in Embodiment 2 of the present invention; Figures 9-12 These correspond to the normal, initial fire status, fire spread status, and fire detection and display diagrams of the two types of detectors displayed in the background during fire detection in Embodiment 2 of the present invention, respectively. Figure 13 This is a flowchart of the fire detection process in Embodiment 2 of the present invention; Figure 14 This is a flowchart of the fire early warning process in Embodiment 2 of the present invention; Figure 15 This is a linkage logic diagram of the fire extinguishing system in Embodiment 3 of the present invention; Figure 16 , Figure 17 The installation positions of the acquisition unit and the image fire detector are shown in Examples 1 to 3, with and without BOX-IN. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 This embodiment provides a non-contact fire detection system for transformers, such as... Figure 1 As shown, it consists of a linear multi-point fire detector, an image fire detector (generally using a high-definition camera combined with an image recognition algorithm, which is existing technology, and such detectors are already installed around existing transformers), an input module, a fire alarm controller, a fiber optic switch, and a fire monitoring and early warning platform.

[0023] Linear multi-point fire detectors use optical array sensors to achieve multiple identifications of infrared temperature and flame, wide-angle monitoring, and precise measurement and positioning functions. They can upload temperature signals, flame alarm signals, fault signals, and address information to fire alarm controllers and fire monitoring and early warning platforms.

[0024] The image fire detector adopts an optical sensor to realize multiple recognition of flame image and visual image, large-view-angle monitoring, and has precise measurement and positioning functions, and can upload the flame alarm signal and visual image signal to a fire alarm controller and a fire monitoring and early warning platform.

[0025] The fire monitoring and early warning platform remotely and non-contactly monitors the transformer temperature and the fire state in real time according to the received infrared temperature information, flame image information and visual image information, predicts the transformer state, accurately identifies the fire scale and the fire spreading trend after a fire occurs, sends a fire linkage control signal, starts a fire extinguishing system, and implements rapid fire extinguishing.

[0026] The linear multi-point fire detector and the image fire detector are both non-contact installed around the transformer, upload real-time temperature and image information to the fire monitoring and early warning platform, upload the alarm state signal to the fire alarm controller, the fire alarm controller confirms the fire, uploads the alarm state information to the fire monitoring and early warning platform, the fire monitoring and early warning platform sends a fire linkage control signal according to the initial position, development scale and spreading trend of the fire, starts the fire extinguishing system of the corresponding position, and implements efficient and rapid fire extinguishing. The system has the characteristics of accurate trend detection, fast response, high sensitivity and accurate positioning of fault and fire source position, and can effectively solve the problems of early fire detection and warning and rapid fire extinguishing of the transformer.

[0027] As shown in Figure 2 The linear multi-point fire detector of the embodiment includes a plurality of collection units 20, the collection unit 20 includes an integrated infrared temperature sensor array, a microprocessor, a longitudinal and power signal conversion circuit, and a longitudinal signal answering circuit; the longitudinal and power signal conversion circuit is connected with the two buses at the input end and connected with the microprocessor at the output end, the microprocessor is connected with the two buses through the longitudinal signal answering circuit, and the infrared temperature sensor array is in communication connection with the microprocessor; the microprocessor stores an address; the plurality of collection units 20 are arranged on both sides of the transformer to form an array of detection points; the detection field angle of each collection unit 20 corresponds to a specific area of the transformer, and the detection field angles of the plurality of collection units 20 cover both sides and the top of the transformer; each image fire detector shoots a specific area of the transformer. The two buses are multi-core shielded twisted pairs.

[0028] For the case that the two sides of the transformer are firewalls, the plurality of collection units 20 in the embodiment are arranged on the firewalls on both sides of the transformer, and for the case that the surrounding of the transformer is a fire branch pipe, the collection units 20 are arranged on the fire branch pipe. No matter which case, the collection units 20 are arranged in a layered manner in the height direction. Figure 16 、 17As shown, for transformers without a BOX_IN, linear multi-point fire detectors are installed on the firewalls on both sides of the transformer, slightly higher than the top of the transformer. Two image fire detectors are installed diagonally opposite the transformer, on the upper part of the firewall, providing all-around protection for the transformer when viewed from above.

[0029] For transformers with BOX_IN, linear multi-point fire detectors are installed on the firewalls on both sides of the transformer, with the installation height slightly higher than the top of the transformer. Two of the fire detectors are installed diagonally opposite the transformer, on the upper part of the firewall, so that the transformer body can be viewed from above. The other one is located outside the BOX, facing the exposed high-voltage bushing of the transformer, providing all-round protection for the transformer.

[0030] like Figure 3 , Figure 4 As shown, the uppermost acquisition unit 20 should be at least 100mm above the top of the transformer. The spacing between two adjacent acquisition units 20 on the same floor should be 1m, and the spacing between upper and lower floors should be 2m. For linear multi-point fire detectors, the installation spacing of the signal acquisition units 20 should be calculated based on the distance between the firewalls or fire pipes on both sides and the transformer body. The installation should follow the principle of selecting the most signal acquisition units 20 according to the most unfavorable scenario, covering all possible fire locations such as the riser and the tank body, and ensuring that any fire point can be detected by at least two signal acquisition units 20. See [link to relevant documentation]. Figure 5 .according to Figure 5 As shown, the detector needs to provide full coverage protection for the transformer body.

[0031] In the picture: h—the straight-line distance from the detector to the transformer; w—Field of view of the signal acquisition unit 20; r—the detection coverage radius of the signal acquisition unit 20; d—The installation distance between two adjacent signal acquisition units 20 of the detector.

[0032] r= (3.1) d=r(3.2) According to equations (3.1) and (3.2), we can derive: d= (3.3) Assuming the field of view of the signal acquisition unit 20 is w = 45 degrees, we can obtain: d=0.41h(3.4) According to equation (3.4), the installation distances d1 and d2 of the detector signal acquisition units 20 on both sides of the firewall are obtained respectively.

[0033] Based on the worst-case scenario principle, a scheme with more than 20 signal acquisition units was selected and deployed on both sides of the firewall.

[0034] In order to expand the detection field of view angle, the infrared probes of the infrared temperature sensors in the infrared temperature sensor array in the embodiment are oriented differently. The infrared temperature sensor array can be in various array forms, such as Figure 6 As shown, the embodiment adopts a 2*2 array, and Figure 6 the rightmost array form. The four infrared temperature sensors are respectively oriented in four directions, and the four infrared temperature sensors are respectively inclined in four directions, so that the horizontal field of view angle is increased by 1 time and the vertical field of view angle is increased by 1 time. Before installation, the installation point needs to be determined, the array form of the infrared temperature sensor and the single inclination angle are calculated according to the installation point, and then the infrared temperature sensor is customized so that the plastic base at the bottom has a suitable inclination angle, that is, has a specific inclination angle. The microprocessor is welded on the other side of the circuit board, so as to communicate and connect the infrared temperature sensor and the microprocessor through the circuit board.

[0035] The collection part 20 in the embodiment is actually a small box body, which is approximately a cuboid with a size of 68mm*28mm*20mm (the size of the collection box is different according to the number of integrated infrared temperature sensors), and is made of high-temperature-resistant materials such as ceramics and high-molecular materials. The microprocessor is purchased from Microchip pic16F1823, and the infrared temperature sensor is A2TPMI334-L5.5 from Perk.

[0036] Embodiment 2 In order to be able to self-check and determine the failure of the fire detector, the microprocessors of the adjacent two collection parts 20 are connected through the connecting line in the embodiment, so that the adjacent two microprocessors send heartbeat signals to each other. The fire detector mainly has two kinds of failures, the signal collection part 20 itself fails, and the connecting line between the collection parts 20 fails. The collection part 20 in the embodiment has a physical address, and after a failure occurs, the fault position information and the fault type are uploaded to the control component. The LCD liquid crystal display unit can display the specific position of the failure. The maintenance personnel can quickly find the corresponding position on site according to the fault physical address, and perform related maintenance and disposal. The two kinds of failures are as follows: 1. Signal collection part 20 itself fails When the circuit or sensor of the collection part 20 fails, the microprocessor uploads the fault position and type to the control component, and the monitoring platform displays the fault position with yellow information, as shown in Figure 7 . The maintenance personnel find the corresponding fault position according to the position information, replace it with a fault-free component, and do a good job in protecting the connection position. Therefore, it can be quickly positioned, without the need for overall replacement, facilitating disposal and saving manpower and material resources.

[0037] 2. The connecting line between the collection parts 20 fails.

[0038] When the connection line between the collection units 20 fails, the microprocessor does not receive the heartbeat signal of the other party, and then uploads the fault position and type to the control component. The monitoring platform displays the fault position with yellow information, as shown in Figure 8 The operation and maintenance personnel find the corresponding fault position according to the position information, check the connection line, replace the connection line without fault, connect the bus head and tail, and protect the connection position. Therefore, the fault can be quickly located without the need for overall replacement, which is convenient for disposal and saves manpower and material resources.

[0039] Embodiment 3 In this embodiment, the fire-fighting monitoring and early warning platform models and displays the transformer and the image fire detector and the linear multi-point fire detector, and performs regional segmentation on the transformer model. The fire-fighting monitoring and early warning platform receives the detection data of the image fire detector and the linear multi-point fire detector, and receives the fire alarm controller. According to the detection data, the alarm area is marked with different colors. As shown in Figure 13 The fire-fighting monitoring and early warning platform receives the temperature and image information uploaded by the linear multi-point fire detector and the image fire detector in real time, analyzes the state of the transformer according to the obtained information, and once a fire alarm occurs, the fire-fighting monitoring and early warning platform combines the alarm track of the linear multi-point fire detector and the image alarm information expansion area of the image fire detector, combines the alarm area with the building layout, and graphically displays the initial position and development scale of the fire, predicts the fire scale (initial, development, and large-scale) and the spreading trend. According to the fire scale and the spreading trend, the fire-fighting monitoring and early warning platform sends a fire-fighting linkage control signal to start the fire extinguishing system of the corresponding position, and cooperates to implement efficient and rapid fire extinguishing. As shown in Figures 9 to 12 , the display diagrams corresponding to the normal state, the initial fire state, the fire spreading state, and the detection of fire by the two detectors are shown.

[0040] When the temperature and image information uploaded by the linear multi-point fire detector and the image fire detector conflict, since the linear multi-point fire detector is arranged in layers on the firewall, its alarm address is the actual physical address, and the image fire detector is arranged at a high position around the transformer, its alarm area is the interface segmentation of the display image. Therefore, the weight of the fire spreading trend judgment factor of the linear multi-point fire detector is 0.6, and the weight of the fire spreading trend judgment factor of the image fire detector is 0.4. As shown in Figure 12 , both the linear multi-point fire detector and the image fire detector detect a fire. When the alarm display interface of the image fire detector overlaps with the alarm display interface of the linear multi-point fire detector, as shown in Figure 8As shown in the medium-deep red area, the system can confirm the occurrence of fire with 100% accuracy, and in other cases, the system will reduce the possibility of determining the occurrence of fire.

[0041] The above is the open fire identification process. Of course, the multiple signal collection units 20 of the linear multipoint fire detector in the embodiment can not only independently identify and process fire characteristic information, but also cooperatively identify, analyze, and process fire information. By using the correlation of signals between the multiple signal collection units 20, fire warning can be achieved. That is, in the warming-up stage before the occurrence of open fire, the collection units 20 can be used for warning. For example, Figure 14 The process is as follows: Taking the 1#~5# signal collection units 20 as an example, assuming that the alarm temperature threshold is 70°C, in a normal case, when the temperature of the area monitored by any one of the 1#~5# signal collection units 20 exceeds 70°C, the signal collection unit 20 triggers an alarm, and the alarm signal is uploaded to the control component. The control component issues a fire sound and light alarm prompt, and the on-duty personnel performs relevant emergency disposal according to the alarm site information. If the temperature of the area monitored by the 1#~5# signal collection units 20 does not exceed 70°C, but more than two have exceeded 90% of the alarm temperature threshold, the signal collection unit 20 triggers a warning, and the warning signal is uploaded to the control component. The control component issues a fire sound and light alarm warning prompt, and the on-duty personnel performs relevant emergency disposal in advance according to the warning site information. If the temperature of the area monitored by the 1#~5# signal collection units 20 does not exceed 70°C, but more than three have exceeded 80% of the alarm temperature threshold, the signal collection unit 20 triggers a warning, and the warning signal is uploaded to the control component. The control component issues a fire sound and light alarm warning prompt, and the on-duty personnel performs relevant emergency disposal in advance according to the warning site information. Therefore, by using the correlation of signals between the multiple signal collection units 20, more reliable and faster fire detection and alarm can be achieved, which provides strong technical support for the reliable and fast use of the linked fire extinguishing equipment.

[0042] In specific operation, the fire monitoring and warning platform receives the temperature and image information uploaded by the linear multipoint fire detector and the image fire detector in real time, analyzes the state of the transformer according to the obtained information, and once a fire alarm occurs, the fire monitoring and warning platform expands the alarm area in combination with the alarm track of the linear multipoint fire detector and the image alarm information of the image fire detector, combines the alarm area with the building layout, graphically displays the initial position and development scale of the fire, predicts the fire scale (initial, development, and large-scale formation) and the spreading trend, and sends a fire linkage control signal according to the fire scale and the spreading trend to start the fire extinguishing system at the corresponding position and cooperatively implement efficient and fast fire extinguishing.

[0043] For the transformer fire fighting system modification, the transformer in operation equipped with contact temperature cable (semiconductor temperature sensor) can be equipped with linear multi-point fire detector, and the fire extinguishing system linkage logic is shown in Figure 15 .

[0044] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A non-contact fire detection system for transformers, characterized in that, The system includes a linear multi-point fire detector; the linear multi-point fire detector includes multiple acquisition units (20), each acquisition unit (20) including an integrated infrared temperature sensor array, a microprocessor, a longitudinal and power signal conversion circuit, and a longitudinal signal response circuit; the input end of the longitudinal and power signal conversion circuit is connected to a two-wire bus, and the output end is connected to the microprocessor; the microprocessor is connected to the two-wire bus through the longitudinal signal response circuit, and the infrared temperature sensor array is communicatively connected to the microprocessor; the microprocessor stores an address; multiple acquisition units (20) are arranged on both sides of the transformer to form a detection point array; each acquisition unit (20) has a detection field of view corresponding to a specific area of ​​the transformer, and the detection field of view of multiple acquisition units (20) covers both sides and the top of the transformer; each image fire detector captures a specific area of ​​the transformer.

2. The transformer non-contact fire detection system according to claim 1, characterized in that, Multiple acquisition units (20) are arranged in layers along the height direction on both sides of the transformer.

3. The transformer non-contact fire detection system according to claim 2, characterized in that, The uppermost acquisition unit (20) is at least 100mm above the top of the transformer.

4. The transformer non-contact fire detection system according to claim 2, characterized in that, The distance between two adjacent collection units (20) on the same floor is 1m, and the distance between the upper and lower floors is 2m.

5. The transformer non-contact fire detection system according to any one of claims 1 to 4, characterized in that, The infrared probes of the infrared temperature sensors in the infrared temperature sensor array are oriented differently.

6. The transformer non-contact fire detection system according to claim 5, characterized in that, The infrared temperature sensor array is a 2*2 array, with the four infrared temperature sensors facing four different directions.

7. The transformer non-contact fire detection system according to claim 5, characterized in that, The welding surface of the base of the infrared temperature sensor is inclined.

8. The transformer non-contact fire detection system according to claim 7, characterized in that, The infrared temperature sensor is electrically soldered to one side of the circuit board via a soldering surface, and the microprocessor is electrically soldered to the same side or the back of the circuit board.

9. The transformer non-contact fire detection system according to any one of claims 1 to 4, characterized in that, It also includes a fire monitoring and early warning platform, which models and displays transformers, image fire detectors, and linear multi-point fire detectors, and divides the transformer model into regions. The fire monitoring and early warning platform receives detection data from image fire detectors and linear multi-point fire detectors, as well as fire alarm controllers, and marks alarm areas with different colors according to the detection data.

10. The transformer non-contact fire detection system according to any one of claims 1 to 4, characterized in that, At least two image fire detectors are arranged at two diagonally opposite corners of the transformer to capture images of the transformer from a downward angle.

11. A transformer fire early warning method using the transformer non-contact fire detection system according to any one of claims 1 to 10, characterized in that, First, group the multiple acquisition units (20) together and set the highest temperature threshold for warning. When the temperature of the area monitored by one acquisition unit (20) in the same group exceeds the threshold, the acquisition unit (20) is triggered to alarm. When the temperature of the area monitored by all acquisition units (20) in the same group does not exceed the threshold, but at least two acquisition units (20) detect that the temperature has exceeded the threshold by a first proportion value, the at least two acquisition units (20) are triggered to alarm. Or, if at least three acquisition units (20) exceed the threshold by a second proportion value, the at least three acquisition units (20) are triggered to alarm. The first proportion value is greater than the second proportion value.

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