Risk monitoring device for distribution transformer district

Abstract

The invention relates to a risk monitoring device for a distribution transformer district, and the device carries out the risk monitoring of an insulator in the distribution transformer district through a front-view camera, a rear-view camera, a lower-view camera and a thermal imaging sensor, and effectively determines the aging degree of the insulator according to the risk monitoring information of the insulator. The scheme of three cameras in the front, back and lower directions is adopted to monitor front and back channels and lower courts, and the risk monitoring device is matched with a small and light machine body, so that the installation is convenient, and the cost of risk monitoring of the distribution transformer courts is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power monitoring, and particularly to a risk monitoring device for a distribution transformer substation area. Background Art

[0002] As an important part of electrical equipment, the insulators in the distribution transformer substation area are directly related to the safe operation and service life of the equipment in terms of the stability and reliability of their performance. However, due to the combined effects of various factors such as electrical stress, mechanical stress, and the environment, the insulators in the distribution transformer substation area age during use. And insulation aging will lead to a decline in insulation performance and even insulation breakdown, thus triggering faults or accidents in the power system. Therefore, monitoring insulation aging is an important measure to ensure the safe operation of the power system. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention proposes a risk monitoring device for a distribution transformer substation area. The risk monitoring device includes: a main board, a front camera, a rear camera, a lower camera, and a thermal imaging sensor; a charging circuit, a camera control circuit, and an interface control circuit are integrated on the main board; The main board is connected to the front camera and the rear camera through the camera control circuit, the main board is connected to the thermal imaging sensor through the interface control circuit, the main board is also connected to the lower camera, the main board is connected to an external power supply through the charging circuit, and the external power supply supplies power to the main board through the charging circuit; The main board is used for: supplying power to the front camera, the rear camera, the lower camera, and the thermal imaging sensor; and also for, when receiving a camera control signal, sending a control instruction to the front camera or the rear camera through the camera control circuit; and also for receiving, through the interface control circuit, risk monitoring information of the lower insulators in the distribution transformer substation area collected by the lower camera and the thermal imaging sensor; The front camera or the rear camera is used for: collecting risk monitoring information of the upper insulators in the distribution transformer substation area based on the control instruction; The main board is also used for: sending the risk monitoring information of the upper insulators and the risk monitoring information of the lower insulators to an external device.

[0004] Optionally, the charging circuit includes: a rectification module, an AC-DC conversion module, a voltage stabilization branch, a charging control module, and a protection branch connected in series in sequence; The input end of the rectification module is connected to the external power supply, and the output end of the protection branch is connected to the main board; The rectification module is used for: eliminating negative pressure for the alternating current input by the external power supply; The AC-DC conversion module is configured to: convert the alternating current after negative pressure elimination into direct current; The voltage stabilization branch is configured to: convert the direct current into direct current within a preset voltage range; The charging control module is configured to: control the direct current within the preset voltage range to supply power to the main board through the protection branch.

[0005] Optionally, the rectification module includes an output branch, a plurality of first resistors, and a polyphase input branch; The first end of the polyphase input branch is connected to the first end of the output branch, the second end of the polyphase input branch is connected to the second end of the output branch, and the third end of each phase input branch is connected to the third end of the output branch through each first resistor; The first end of the output branch and the first end of the polyphase input branch are respectively connected to the input end of the AC-DC conversion module; The fourth end of the output branch and the fourth end of the polyphase input branch are respectively connected to the external power supply.

[0006] Optionally, each phase input branch includes a fuse, a second resistor, and an input rectifier connected in series in sequence, the output branch includes an output rectifier, and both the input rectifier and the output rectifier include a first bridge arm and a second bridge arm connected in anti-parallel. The first bridge arm includes a first diode and a second diode connected in series, and the second bridge arm includes a third diode and a fourth diode connected in series.

[0007] Optionally, the AC-DC conversion module includes an AC-DC conversion chip, a common mode choke, and a first inductor; The input end of the AC-DC conversion chip is connected to the output end of the rectification module through the common mode choke and the first inductor; The output end of the AC-DC conversion chip is connected to the input end of the voltage stabilization branch.

[0008] Optionally, the voltage stabilization branch includes a first capacitor, a second capacitor, a second inductor, and a bidirectional breakdown diode; The positive electrode of the first capacitor is connected to the positive electrodes of the second capacitor and the first end of the bidirectional breakdown diode through the second inductor, and the negative electrode of the first capacitor, the negative electrode of the second capacitor, and the second end of the bidirectional breakdown diode are grounded; The positive electrode of the first capacitor is further connected to the output end of the AC-DC conversion module, and the first end of the bidirectional breakdown diode is further connected to the input end of the charging control module.

[0009] Optionally, the protection branch includes a first MOS transistor, a second MOS transistor, and a switching transistor; The first end of the first MOS transistor is connected to the control end of the switching transistor, the second end of the first MOS transistor is connected to the first end of the second MOS transistor, and the control end of the first MOS transistor is respectively connected to the first end of the first MOS transistor, the control end of the second MOS transistor, and the first end of the switching transistor; The second end of the second MOS transistor is connected to the control end of the second MOS transistor, and the second end of the switching transistor is grounded; The first end of the first MOS transistor is further connected to the output end of the charging control module, and the second end of the second MOS transistor is further connected to the power access end of the main board.

[0010] Optionally, the risk monitoring device further includes: a surge board, the surge board is integrated with a protection circuit, and the surge board is connected to the charging circuit; The surge board is configured to: consume the instantaneous redundant electric energy input by the charging circuit through the protection circuit; The protection circuit includes a gas discharge tube, a self - resetting fuse, a parasitic resistor, a transient voltage suppression diode, an electrostatic discharge protection diode, and a capacitor assembly, and the capacitor assembly includes a plurality of capacitors connected in parallel; The first end of the gas discharge tube is respectively connected to the first end of the parasitic resistor, the first end of the transient voltage suppression diode, the first end of the electrostatic discharge protection diode, and the first end of the capacitor assembly through the self - resetting fuse, and the second end of the gas discharge tube, the second end of the parasitic resistor, the second end of the transient voltage suppression diode, the second end of the electrostatic discharge protection diode, and the second end of the capacitor assembly are grounded; The first end of the gas discharge tube and the first end of the capacitor assembly are respectively connected to the charging circuit.

[0011] Optionally, the risk monitoring device further includes: a battery and a supplementary light; The charging circuit is further connected to the battery, and the supplementary light is connected to the main board; The charging circuit is further configured to: charge the battery when the detected battery energy is less than or equal to a preset electric energy threshold; The battery is configured to: supply power to the main board through the charging circuit when the external power supply is cut off, and the main board supplies power to the front - view camera, the rear - view camera, the lower - view camera, the thermal imaging sensor, and the supplementary light.

[0012] Optionally, the risk monitoring device further includes: a first housing and a second housing; A cavity is formed between the first outer shell and the second outer shell. The cavity is formed by the middle area of the first outer shell being concave, and the edges of the first outer shell and the second outer shell are fixedly connected. The main board, the thermal imaging sensor, the downward-looking camera, and the fill light are arranged in the cavity. The front-looking camera and the rear-looking camera are symmetrically arranged on the inner walls on both sides of the cavity. The battery is fixedly connected to the inner side of the second outer shell, and a connecting component is arranged on the outer side of the second outer shell. The connecting component is used for fixedly installing the risk monitoring device. A wire outlet hole is arranged on the second outer shell, and the wire outlet hole is used for the risk monitoring device to externally connect wires.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a risk monitoring device for a distribution transformer substation area. The risk monitoring device for the distribution transformer substation area monitors the risk monitoring information of insulators in the distribution transformer substation area through the front-looking camera, the rear-looking camera, the downward-looking camera, and the thermal imaging sensor. According to the risk monitoring information of the insulators, the aging degree of the insulators can be effectively determined. The front, rear, and downward three-camera scheme is adopted to meet the monitoring of the front and rear channels and the lower substation area. Moreover, the risk monitoring device is equipped with a small and light body, which makes the installation convenient and reduces the cost of risk monitoring in the distribution transformer substation area. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of a risk monitoring device for a distribution transformer substation area provided by the present invention; Figure 2 It is a schematic diagram of a camera control circuit provided by the present invention; Figure 3 It is a schematic diagram of an interface control circuit provided by the present invention; Figure 4 It is a front view of a risk monitoring device provided by the present invention; Figure 5 It is a bottom view of a risk monitoring device provided by the present invention; Figure 6 It is Figure 5 A cross-sectional view of the risk monitoring device A-A shown in; Figure 7 It is a top view of a risk monitoring device provided by the present invention; Figure 8 It is a schematic diagram of a charging circuit provided by the present invention; Figure 9 It is a schematic diagram of a charging control module provided by the present invention; Figure 10 It is a schematic diagram of a protection circuit provided by the present invention. Detailed Embodiments

[0015] Embodiment 1: Figure 1 A schematic diagram of a risk monitoring device for a distribution transformer substation area provided by the present invention is shown as Figure 1 shown. The risk monitoring device includes: a main board, a front-view camera, a rear-view camera, a downward-view camera, and a thermal imaging sensor; a charging circuit, a camera control circuit, and an interface control circuit are integrated on the main board; the main board is connected to the front-view camera and the rear-view camera through the camera control circuit, the main board is connected to the thermal imaging sensor through the interface control circuit, the main board is also connected to the downward-view camera, the main board is connected to an external power supply through the charging circuit, and the external power supply supplies power to the main board through the charging circuit; the main board is configured to: supply power to the front-view camera, the rear-view camera, the downward-view camera, and the thermal imaging sensor; and is further configured to, when receiving a camera control signal, send a control instruction to the front-view camera or the rear-view camera through the camera control circuit; and is further configured to receive, through the interface control circuit, risk monitoring information of the lower insulators in the distribution transformer substation area collected by the downward-view camera and the thermal imaging sensor; the front-view camera or the rear-view camera is configured to: collect risk monitoring information of the upper insulators in the distribution transformer substation area based on the control instruction; the main board is further configured to: send the risk monitoring information of the upper insulators and the risk monitoring information of the lower insulators to an external device.

[0016] Among them, the thermal imaging sensor can be a thermal imaging lens or a thermal imaging camera, and the front-view camera, the rear-view camera, and the downward-view camera can all be ordinary light cameras. The external device can be a TTU (Transformer Terminal Unit) device. The camera control circuit can be as Figure 2 shown, and the interface control circuit can be as Figure 3 shown.

[0017] It should be noted that for the image temperature measurement solution using a thermal imaging lens for temperature measurement, the thermal imaging lens detects the infrared radiation emitted by an object and generates a thermal image to achieve temperature measurement, effectively avoiding errors caused by long-term operation. At the same time, this solution has strong anti-interference ability and will not cause frame loss due to EMC interference. The main board can be standardly equipped with a TTU interface, which can be linked with TTU devices. It can compare and monitor the temperature of the insulating sleeve (i.e., insulator) by drawing a curve based on the different output powers of the substation area at different times fed back by the TTU, clearly showing the relationship between temperature rise and output power, and predictably maintaining the sites at risk. In some scenarios, it is also possible to obtain the data of the output power of the substation area at different times through the TTU device. Combining the temperature measurement data, the relationship between the output power of the substation area and the temperature rise at the monitored position can be accurately obtained, and the working mode of the substation area can be reasonably controlled. At the same time, the image, temperature and other data collected by the device can also be uploaded to the TTU device for use by other terminal devices.

[0018] The key of the present invention lies in the non-contact temperature acquisition method. That is, the thermal imaging lens is connected to the core board (i.e., the main board) through the USB in the interface control circuit, which can realize the functions of front camera / rear camera + bottom camera + thermal imaging picture-in-picture. At the same time, the thermal imaging and the bottom camera can perform image superposition to accurately confirm the position of the temperature acquisition point (since the perspectives of the thermal imaging and the bottom view are inconsistent, the thermal imaging perspective range is used as the picture superposition area). The front, rear and bottom views of the device all support front-end intelligent analysis. The timed photographed images, videos and alarm pictures are all uploaded to the designated video platform through the 4G / WIFI network. Non-image information such as alarm information and temperature data can be uploaded to the TTU monitoring platform through the network port. The thermal imaging can upload temperature data regularly / actively, draw a temperature change curve, and predict the impact of the electricity consumption at different times and seasons in the service area of the distribution transformer substation on the temperature of the insulating sleeve according to the temperature change curve of the insulating sleeve. The present invention makes the installation convenient through the non-contact temperature measurement method (i.e., setting a thermal imaging lens in the risk monitoring device) and the small and light body. It only needs to be installed on the support pole on one side of the distribution transformer substation area and align the lens with the transformer column head of the distribution transformer substation area. During the installation or maintenance process, the distribution transformer in the distribution transformer substation area does not need to be powered off.

[0019] Optionally, the risk monitoring device further includes: a battery and a fill light; the charging circuit is further connected to the battery, and the fill light is connected to the main board; the charging circuit is further configured to: charge the battery when the detected battery energy is less than or equal to a preset electric energy threshold; the battery is configured to: when the external power supply is powered off, supply power to the main board through the charging circuit, and the main board supplies power to the front camera, the rear camera, the bottom camera, the thermal imaging sensor and the fill light.

[0020] Among them, the device (i.e., the risk monitoring device) can adopt an integrated design, including a front view (i.e., a front view camera), a rear view (i.e., a rear view camera), a downward view (i.e., a downward view camera), as well as a thermal imaging lens, a fill light, a battery and other structures. The front view and the rear view can meet the monitoring and analysis of the line channel, and can identify external damage hazards such as tower cranes and excavators and give real-time warnings.

[0021] Figure 4 The front view of a risk monitoring device provided by the present invention is shown in Figure 4 As shown, the risk monitoring device further includes: a first housing 1 and a second housing 2; a cavity is formed between the first housing 1 and the second housing 2, and the cavity is formed by the inward depression of the middle area of the first housing 1, and the edges of the first housing 1 and the second housing 2 are fixedly connected; the main board, the thermal imaging sensor, the downward view camera and the fill light are arranged in the cavity, the front view camera and the rear view camera are symmetrically arranged on the inner walls on both sides of the cavity, the battery is fixedly connected to the inner side of the second housing 2, and a connecting component is arranged on the outer side of the second housing 2, and the connecting component is used for fixedly installing the risk monitoring device; a wire outlet hole is arranged on the second housing 2, and the wire outlet hole is used for the risk monitoring device to connect to the external wire.

[0022] Exemplarily, as shown in Figure 5 As shown, the fill light 104, the downward view wide-angle lens 105, the thermal imaging lens or the thermal imaging camera 102 are arranged side by side within the inclination angle at the rear end of the device. The main board is placed close to the fill light, the downward view wide-angle lens, and the thermal imaging lens, and is located at the bottom layer inside the machine shell (i.e., the first housing). One ordinary light camera is placed vertically on each side of the front and rear of the machine shell (i.e., the inner walls on both sides of the cavity). Figure 6 For Figure 5 The sectional view of a risk monitoring device A-A shown in Figure 6 As shown, the risk monitoring device mainly consists of an ordinary light camera (or channel camera) 101, a thermal imaging lens or a thermal imaging camera 102, a main board 103, a surge board (or power protection board), a battery 201, a fill light, and a connecting wire harness. The surge board is placed directly above the center position of the main board and is fixed by a patch nut. At the same time, it is electrically connected to the corresponding interface of the charging circuit integrated on the main board through a pin. Due to its large weight, the battery is placed at the center position of the upper shell (the second housing) and is fixed by a bracket and connected to the main board through a silicone wire harness. As shown in Figure 7As shown, the wire outlet hole 106 of the device harness is located above the front part of the fuselage and is used for external wiring of functions such as power supply and network port. The outlet hole faces upward, which is convenient for fixing the harness to the mounting bracket after installation and prevents the harness from blocking the lens. Since the supplementary light, the lower-view wide-angle lens, and the thermal imaging lens are close to the main board, their interfaces can be directly snapped onto the main board to reduce interference during signal transmission. The front camera and the rear camera are connected through FPC (Flexible Printed Circuit, that is, the camera control circuit) because there is a certain distance between them and the main board. All external interfaces of the main board use wire-to-board connectors, and the harness can be directly plugged into the main board.

[0023] Among them, a thermal imaging lens is used on the left side of the lower camera, which can measure the temperature of the transformer insulating bushing (i.e., insulator) and the custom temperature measurement point and upload the temperature data. Within the viewing angle of the thermal imaging lens, its image can be fused with the image of the lower-view wide-angle lens to more intuitively display the temperature of the specific position of the actual object. The thermal imaging lens is fixed in the lower-view position through a structural solution, and the lens slightly protrudes out of the casing, reducing the error influence of germanium glass lenses on temperature measurement compared with the conventional solution. Using the main control module (i.e., the main board) based on the Qualcomm 450 platform, dual-light fusion of thermal imaging images and visible light images can be achieved. While realizing temperature measurement, the surrounding environment can still be seen clearly. The computing power of the module itself can support the front-end analysis of the visible light lens, and it can effectively identify and alarm for situations such as fireworks and personnel intrusion.

[0024] Figure 8 The figure shows a schematic diagram of a charging circuit provided by the present invention, as Figure 8 shown, the charging circuit includes: a rectification module, an AC-DC conversion module, a voltage stabilization branch, a charging control module, and a protection branch connected in series in sequence; the input end of the rectification module is connected to the external power supply, and the output end of the protection branch is connected to the main board; the rectification module is used for: eliminating the negative voltage of the alternating current input by the external power supply; the AC-DC conversion module is used for: converting the alternating current after negative voltage elimination into direct current; the voltage stabilization branch is used for: converting the direct current into direct current within a preset voltage range; the charging control module is used for: controlling the direct current within the preset voltage range to supply power to the main board through the protection branch.

[0025] Among them, the charging control module can be as Figure 9 shown.

[0026] Exemplarily, the main board mainly includes a power management part (i.e., the charging circuit) and a lens part (the camera control circuit and the interface control circuit). The power management part mainly controls the power supply of the device (i.e., the risk monitoring device) and battery charging. The host operates normally powered by the battery. When the device is installed and connected to the mains power, it is converted to DC18V input through a bridge rectifier circuit (i.e., the rectifier branch) and input into the charging control circuit to charge the battery. This circuit enables the device to be connected to three-phase voltage or any single phase separately. The charging control circuit (i.e., the charging control module) judges the battery voltage through the detection port to feedback to the charging control chip to achieve different charging methods. When the battery voltage is low, full-power charging is carried out to quickly replenish the battery energy. When the battery voltage is high, trickle charging is carried out to maintain the battery voltage at a relatively high level.

[0027] The lens part circuit is mainly connected to four lenses, including 3 ordinary light lenses (i.e., the front-view camera, the rear-view camera, and the downward-view camera) and 1 thermal imaging lens. The circuit supports two 4-line signals and can transmit 2-way ordinary light lens videos simultaneously to achieve picture-in-picture. Among them, the lens (i.e., the front-view camera and the rear-view camera) switching control is carried out through the ordinary light lens control circuit (the camera control circuit). During the use of the picture-in-picture function, the function of switching the lens video is realized. The thermal imaging lens uses the USB communication method, and through the control circuit (i.e., the interface control circuit), the time-division multiplexing of the network port, the debugging port, and the thermal imaging function is realized. It is separated from the circuits of the other three ordinary light lenses and can independently collect image information. At the same time, it can be superimposed with the image of the adjacent downward-view lens to achieve the temperature measurement function based on the visible light image.

[0028] Optionally, still taking Figure 8 as an example, the rectification module includes an output branch, a plurality of first resistors, and a polyphase input branch; the first end of the polyphase input branch is connected to the first end of the output branch, the second end of the polyphase input branch is connected to the second end of the output branch, and the third end of each phase input branch is connected to the third end of the output branch through each first resistor; the first end of the output branch and the first end of the polyphase input branch are respectively connected to the input end of the AC-DC conversion module; the fourth end of the output branch and the fourth end of the polyphase input branch are respectively connected to the external power supply.

[0029] Optionally, still taking Figure 8 as an example, each phase input branch includes a fuse, a second resistor, and an input rectifier connected in series in sequence. The output branch includes an output rectifier. Both the input rectifier and the output rectifier include a first bridge arm and a second bridge arm connected in reverse parallel. The first bridge arm includes a first diode and a second diode connected in series, and the second bridge arm includes a third diode and a fourth diode connected in series.

[0030] Optionally, still taking Figure 8For example, the AC-DC conversion module includes an AC-DC conversion chip, a common-mode choke coil, and a first inductor; the input end of the AC-DC conversion chip is connected to the output end of the rectification module through the common-mode choke coil and the first inductor; the output end of the AC-DC conversion chip is connected to the input end of the voltage regulation branch.

[0031] Optionally, still taking Figure 8 as an example, the voltage regulation branch includes a first capacitor, a second capacitor, a second inductor, and a bidirectional breakdown diode; the positive electrode of the first capacitor is connected to the positive electrodes of the second capacitor and the first end of the bidirectional breakdown diode through the second inductor, and the negative electrode of the first capacitor, the negative electrode of the second capacitor, and the second end of the bidirectional breakdown diode are grounded; the positive electrode of the first capacitor is further connected to the output end of the AC-DC conversion module, and the first end of the bidirectional breakdown diode is further connected to the input end of the charging control module.

[0032] Optionally, still taking Figure 8 as an example, the protection branch includes a first MOS transistor, a second MOS transistor, and a switching transistor; the first end of the first MOS transistor is connected to the control end of the switching transistor, the second end of the first MOS transistor is connected to the first end of the second MOS transistor, and the control end of the first MOS transistor is respectively connected to the first end of the first MOS transistor, the control end of the second MOS transistor, and the first end of the switching transistor; the second end of the second MOS transistor is connected to the control end of the second MOS transistor, and the second end of the switching transistor is grounded; the first end of the first MOS transistor is further connected to the output end of the charging control module, and the second end of the second MOS transistor is further connected to the power access end of the main board.

[0033] Optionally, the risk monitoring device further includes: a surge board, which integrates a protection circuit and is connected to the charging circuit; the surge board is used for: consuming the instantaneous redundant electric energy input by the charging circuit through the protection circuit; as Figure 10 shown, the protection circuit includes a gas discharge tube, a self-resetting fuse, a parasitic resistor, a transient voltage suppression diode, an electrostatic discharge protection diode, and a capacitor assembly, and the capacitor assembly includes a plurality of capacitors connected in parallel; the first end of the gas discharge tube is connected to the first ends of the parasitic resistor, the transient voltage suppression diode, the electrostatic discharge protection diode, and the capacitor assembly respectively through the self-resetting fuse, and the second end of the gas discharge tube, the second end of the parasitic resistor, the second end of the transient voltage suppression diode, the second end of the electrostatic discharge protection diode, and the second end of the capacitor assembly are grounded; the first end of the gas discharge tube and the first end of the capacitor assembly are respectively connected to the charging circuit.

[0034] It should be noted that the protection circuit (i.e., the safeguard circuit) mainly consists of protection circuits such as ESD (Electrostatic Discharge Protection Device, electrostatic discharge protection diode), TVS (Transient Voltage Suppressor, transient voltage suppression diode), gas discharge tube, and self - resetting fuse. It is designed at the front end of the power input to achieve the function of protecting the safety of the device. In the environment of strong electric fields and multiple static electricity in the distribution transformer substation area, the protection device can work safely and normally for a long time, and at the same time play an isolation role. Whether there is a fault in the external or internal power supply, the other end can be protected from being affected.

[0035] In the prior art, the front - rear - lower three - camera scheme is mostly adopted to meet the monitoring of the front - rear channels and the lower substation area, and a wireless temperature - measuring module is used to collect the temperature of the insulating sleeve. However, there are disadvantages such as inconvenient installation of the device and the need for the temperature - measuring probe to be closely attached to the sleeve.

[0036] For example: The method and device for image target recognition in a power grid distribution network substation area based on multi - vision cameras with the publication number CN118212581A. The present invention discloses a method and device for image target recognition in a power grid distribution network substation area based on multi - vision cameras, including the following steps: training an artificial intelligence recognition algorithm based on machine deep learning, identifying abnormal situations through machine vision to obtain on - site status data in different locations; conducting an integrated design of multi - vision lenses; and performing multi - functional integration of image target recognition to achieve image target recognition. The device includes a wireless Internet of Things receiving module, a computing module, a dual - light supplementary light, a lower - view lens, a rear - view lens, a front - view lens, a red - blue warning light, a built - in backup lithium battery, a temperature sensor, a humidity sensor, a 4G antenna, a SIM card interface, a microphone, and a speaker. Through the video image artificial intelligence recognition algorithm, the present invention can realize the recognition and warning of on - site risk concerns, and can effectively improve the reliability of power distribution supply.

[0037] A comprehensive data acquisition terminal with the publication number CN217985248U discloses a comprehensive data acquisition terminal, including a fuselage and electronic components installed on the fuselage. The electronic components include a control main board and a battery, a camera, a photosensitive sensor, a pick - up, an infrared lamp, an antenna, an audible and visual warning device, and a temperature and humidity detector that are electrically connected to the control main board respectively; the comprehensive data acquisition terminal provided by the present disclosure has the characteristics of rich functions, integrating functions such as image acquisition, sound pickup, infrared light, audible and visual alarm, and temperature and humidity detection, with a high degree of integration, and can meet the detection requirements of various projects.

[0038] Both of the above two solutions adopt the built-in module structure design. Since the installation position of the bench is a cement pole, the device needs to be small and light, and the built-in functions such as acoustic-optic alarm and ultrasonic cannot achieve ideal effects. For sleeve temperature measurement, an internal receiving module is mostly used, which is realized by matching with a temperature measurement probe. During the installation and maintenance process of this solution, the transformer needs to be powered off. When using a wireless sleeve temperature measurement module, the temperature measurement probe needs to be installed closely to the sleeve. Most of the existing temperature measurement modules use steel tie straps for installation, which are prone to looseness over time, resulting in a decrease in temperature measurement accuracy. When installing this type of temperature sensor, power-off installation is required, and the installation and maintenance process will cause power-off in the area controlled by the transformer. The sleeve temperature measurement module mostly uses the 433MHz frequency to transmit data. In a strong electric field environment such as a distribution transformer substation area, it is prone to interference and data packet loss.

[0039] The risk monitoring device provided by the present invention uses a non-contact temperature measurement method to replace the traditional contact temperature measurement method, avoiding power-off installation in the distribution transformer substation area caused by equipment installation, etc. By matching with visual images, the heat generation position of the insulating sleeve fault can be accurately confirmed. Comparing the temperature of the acquisition points of the traditional contact temperature measurement, the temperature of each area in the overall picture presented by the thermal imaging can identify whether it is the overall heating caused by the overall aging of the sleeve, excessive regional load, etc. A more suitable distribution transformer substation area upgrade plan can be formulated based on the temperature image provided by the thermal imaging, greatly reducing the labor cost and equipment maintenance cost. At the same time, real-time warning can timely replace the insulating sleeve that has been in the warning threshold range for a long time to avoid flashover or explosion accidents.

[0040] The above are only embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention pending approval.

Claims

1. A risk monitoring device for a distribution transformer substation area, characterized in that The risk monitoring device includes: a main board, a front camera, a rear camera, a downward camera, and a thermal imaging sensor; a charging circuit, a camera control circuit, and an interface control circuit are integrated on the main board; The main board is connected to the front camera and the rear camera through the camera control circuit, the main board is connected to the thermal imaging sensor through the interface control circuit, the main board is also connected to the downward camera, the main board is connected to an external power supply through the charging circuit, and the external power supply supplies power to the main board through the charging circuit; The main board is configured to: supply power to the front camera, the rear camera, the downward camera, and the thermal imaging sensor; and is also configured to, when receiving a camera control signal, send a control instruction to the front camera or the rear camera through the camera control circuit; and is further configured to receive, through the interface control circuit, risk monitoring information of the lower insulator in the distribution transformer area collected by the downward camera and the thermal imaging sensor; The front camera or the rear camera is configured to: collect risk monitoring information of the upper insulator in the distribution transformer area based on the control instruction; The main board is also configured to: send the risk monitoring information of the upper insulator and the risk monitoring information of the lower insulator to an external device.

2. The device according to claim 1, wherein The charging circuit includes: a rectification module, an AC-DC conversion module, a voltage stabilization branch, a charging control module, and a protection branch connected in series in sequence; The input end of the rectification module is connected to the external power supply, and the output end of the protection branch is connected to the main board; The rectification module is configured to: eliminate negative pressure for the alternating current input by the external power supply; The AC-DC conversion module is configured to: convert the alternating current after negative pressure elimination into direct current; The voltage stabilization branch is configured to: convert the direct current into direct current within a preset voltage range; The charging control module is configured to: control the direct current within the preset voltage range to supply power to the main board through the protection branch.

3. The device according to claim 2, wherein The rectification module includes an output branch, a plurality of first resistors, and a multi-phase input branch; The first end of the multi-phase input branch is connected to the first end of the output branch, the second end of the multi-phase input branch is connected to the second end of the output branch, and the third end of each phase input branch is connected to the third end of the output branch through each first resistor; The first end of the output branch and the first end of the multi-phase input branch are respectively connected to the input end of the AC-DC conversion module; The fourth end of the output branch and the fourth end of the multi-phase input branch are respectively connected to the external power supply.

4. The device according to claim 3, characterized in that Each phase input branch includes a fuse, a second resistor, and an input rectifier connected in series in sequence, the output branch includes an output rectifier, and both the input rectifier and the output rectifier include a first bridge arm and a second bridge arm connected in reverse parallel, the first bridge arm includes a first diode and a second diode connected in series, and the second bridge arm includes a third diode and a fourth diode connected in series.

5. The device according to claim 2, characterized in that The AC-DC conversion module includes an AC-DC conversion chip, a common mode choke, and a first inductor; The input end of the AC-DC conversion chip is connected to the output end of the rectification module through the common-mode choke and the first inductor; The output end of the AC-DC conversion chip is connected to the input end of the voltage regulation branch.

6. The device according to claim 2, characterized in that, The voltage regulation branch includes a first capacitor, a second capacitor, a second inductor, and a bidirectional breakdown diode; The positive electrode of the first capacitor is connected to the positive electrodes of the second capacitor and the first end of the bidirectional breakdown diode through the second inductor. The negative electrode of the first capacitor, the negative electrode of the second capacitor, and the second end of the bidirectional breakdown diode are grounded; The positive electrode of the first capacitor is also connected to the output end of the AC-DC conversion module, and the first end of the bidirectional breakdown diode is also connected to the input end of the charging control module.

7. The device according to claim 2, characterized in that, The protection branch includes a first MOS transistor, a second MOS transistor, and a switching transistor; The first end of the first MOS transistor is connected to the control end of the switching transistor. The second end of the first MOS transistor is connected to the first end of the second MOS transistor. The control end of the first MOS transistor is respectively connected to the first end of the first MOS transistor, the control end of the second MOS transistor, and the first end of the switching transistor; The second end of the second MOS transistor is connected to the control end of the second MOS transistor, and the second end of the switching transistor is grounded; The first end of the first MOS transistor is also connected to the output end of the charging control module, and the second end of the second MOS transistor is also connected to the power supply access end of the main board.

8. The device according to claim 1, wherein The risk monitoring device further includes: a surge board, which is integrated with a protection circuit and is connected to the charging circuit; The surge board is configured to: consume the instantaneous redundant electric energy input by the charging circuit through the protection circuit; The protection circuit includes a gas discharge tube, a self-resetting fuse, a parasitic resistor, a transient voltage suppression diode, an electrostatic discharge protection diode, and a capacitor assembly. The capacitor assembly includes a plurality of capacitors connected in parallel; The first end of the gas discharge tube is respectively connected to the first end of the parasitic resistor, the first end of the transient voltage suppression diode, the first end of the electrostatic discharge protection diode, and the first end of the capacitor assembly through the self-resetting fuse. The second end of the gas discharge tube, the second end of the parasitic resistor, the second end of the transient voltage suppression diode, the second end of the electrostatic discharge protection diode, and the second end of the capacitor assembly are grounded; The first end of the gas discharge tube and the first end of the capacitor assembly are respectively connected to the charging circuit.

9. The device according to any one of claims 1-8, characterized in that, The risk monitoring device further includes: a battery and a fill light; The charging circuit is also connected to the battery, and the fill light is connected to the main board; The charging circuit is further configured to: charge the battery when the detected battery energy is less than or equal to a preset electric energy threshold; The battery is configured to: supply power to the main board through the charging circuit when the external power supply is cut off, and the main board supplies power to the front camera, the rear camera, the lower camera, the thermal imaging sensor, and the fill light.

10. The device according to claim 9, characterized in that, The risk monitoring device further includes: a first housing and a second housing; A cavity is formed between the first housing and the second housing. The cavity is formed by the middle region of the first housing being recessed inward, and the edges of the first housing and the second housing are fixedly connected. The main board, the thermal imaging sensor, the downward-looking camera, and the fill light are arranged in the cavity. The front-looking camera and the rear-looking camera are symmetrically arranged on the inner walls of both sides of the cavity. The battery is fixedly connected to the inner side of the second housing, and a connecting component is arranged on the outer side of the second housing. The connecting component is used for fixedly installing the risk monitoring device. A wire outlet hole is arranged on the second housing. The wire outlet hole is used for the external wiring of the risk monitoring device.

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