Low-voltage power supply system and method for long-distance power tunnel monitoring equipment and monitoring equipment

Abstract

The invention belongs to the technical field of power supply of power tunnel equipment, and provides a low-voltage power supply system and method for long-distance power tunnel monitoring equipment and the monitoring equipment. A power supply host is arranged in a machine room outside a tunnel, and received 220V alternating current can be reduced to preset voltage; 220V alternating current is reduced to preset voltage and then enters the tunnel to supply power to on-line monitoring equipment, and potential safety hazards in the power tunnel are reduced in combination with branching power supply and branching protection modes of a multi-core cable; a heat dissipation module is arranged on a power supply host, and a control module controls the heat dissipation module to be switched among a non-starting heat dissipation mode, an independent working mode of a first heat dissipation execution unit and a simultaneous working mode of the first heat dissipation execution unit and a second heat dissipation execution unit according to the environment temperature in the host. The equipment heat dissipation problem after the new environment of the machine room where the power supply host is located is considered, and through flexible control of multiple heat dissipation modes, the heat dissipation cost is reduced, and the service life of the power supply host and heat dissipation and power supply related parts is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply for electric tunnel equipment, and in particular relates to a low-voltage power supply system, method and monitoring equipment for long-distance electric tunnel monitoring equipment. Background Art

[0002] At present, the electrical equipment in cable tunnels can be basically divided into two categories. The first category is online detection equipment, which monitors the operation of cables and is characterized by low power consumption and long distance. The second category is inspection equipment, which replaces workers to conduct inspections in tunnels and is characterized by high power, such as robot dogs, drones, tunnel inspection robots, etc.

[0003] When online detection equipment and other equipment are working in the tunnel, they are generally powered directly by 220V AC. In long-distance tunnels, the transmission of 220V AC requires the use of power cables and other equipment. In the complex tunnel environment, it is easy to cause leakage, which brings safety problems to construction personnel and power cables in the tunnel. In traditional technologies, although there is a way to set up voltage regulators from the outside of the tunnel to solve the problem of occupying space in the tunnel, only the installation position of the power cabinet is adjusted, and the safety problems such as electric shock in the power tunnel caused by long-distance power supply are not considered and cannot be solved. It also does not consider the impact of the new location environment on the heat dissipation of the equipment after the position of the relevant equipment is adjusted or the equipment is added, and the service life of the equipment in the new location environment cannot be guaranteed. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a low-voltage power supply system, method and monitoring equipment for long-distance power tunnel monitoring equipment, which reduces the voltage of 220V AC power to a preset voltage before entering the tunnel to power the online monitoring equipment. Combined with the branch line power supply and branch line protection method of multi-core cables, the safety hazards in the power tunnel are reduced and the risk of electric shock in the tunnel is avoided. At the same time, a heat dissipation module is set on the power supply host, taking into account the equipment heat dissipation problem after the power supply host is located in the new environment of the computer room, and through the flexible control of multiple heat dissipation modes, the heat dissipation cost is reduced while ensuring the heat dissipation effect, and the service life of the power supply host and heat dissipation and power supply related components is guaranteed to the greatest extent.

[0005] In order to achieve the above objectives, in a first aspect, the present invention provides a low-voltage power supply system for long-distance power tunnel monitoring equipment, which adopts the following technical solutions:

[0006] A low-voltage power supply system for remote power tunnel monitoring equipment comprises a power supply host located in a machine room outside the tunnel, a security unit connected to the power supply host, and a power supply relay located in the tunnel;

[0007] The power relay is connected to the security unit via a multi-core cable; the power host includes a processing module for receiving 220V AC power, a power conversion module capable of reducing the voltage of 220V AC power to a preset voltage, a heat dissipation module and a control module; the heat dissipation module includes a first heat dissipation execution unit and a second heat dissipation execution unit respectively connected to the control module; the control module is configured to: according to the ambient temperature in the power host, control the heat dissipation module to switch between three modes: a non-starting heat dissipation mode, an independent working mode of the first heat dissipation execution unit, and a simultaneous working mode of the first heat dissipation execution unit and the second heat dissipation execution unit.

[0008] Furthermore, the processing module, control module and communication module are arranged in one end area of ​​the power supply host, and the power conversion module is arranged in the other end area; the first heat dissipation execution unit and the second heat dissipation execution unit are arranged on the side wall of the power supply host located at one end of the power conversion module.

[0009] Furthermore, the processing module includes a leakage protector, a lightning protection module and a high-current relay.

[0010] Furthermore, when the ambient temperature inside the power supply host is lower than a first preset temperature, no heat dissipation is performed; when the ambient temperature inside the power supply host is between the first preset temperature and the second preset temperature, the first heat dissipation execution unit works independently; when the ambient temperature inside the power supply host is higher than the second preset temperature, the first heat dissipation execution unit and the second heat dissipation execution unit work simultaneously; the first preset temperature is lower than the second preset temperature.

[0011] Further, when the difference between the received voltage and the preset voltage is less than the first preset difference, the first preset temperature and the second preset temperature are reduced; when the difference between the received voltage and the preset voltage is greater than the second preset difference, the first preset temperature and the second preset temperature are increased; when the difference between the received voltage and the preset voltage is between the first preset difference and the second preset difference, the first preset temperature and the second preset temperature remain unchanged; the first preset difference is less than the second preset difference.

[0012] Furthermore, the control module is connected to the power conversion module, and the control module adjusts the output voltage of the power conversion module according to the feedback voltage.

[0013] Furthermore, the security unit is a symmetrically arranged junction box; the security unit includes two power input terminals, a branch wiring terminal, a surge protection module, a branch protection unit and two current output terminals.

[0014] Furthermore, a first power relay and a second power relay are arranged between the security unit and the monitoring device; the first power relay and the second power relay both include a power input module, a wiring module, a voltage boosting module, a power output module and a heat dissipation module.

[0015] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also provides a low-voltage power supply method for long-distance power tunnel monitoring equipment, which adopts the following technical solution:

[0016] A low-voltage power supply method for long-distance power tunnel monitoring equipment uses the low-voltage power supply system for long-distance power tunnel monitoring equipment as described in the first aspect, comprising:

[0017] After receiving the 220V AC power, the processing module reduces the voltage of the 220V AC power to a preset voltage through the power conversion module; the monitoring equipment is powered by the security unit, the power relay and the multi-core cable; during the power supply process, the control module controls the heat dissipation module to switch between the three modes of not starting the heat dissipation mode, the independent working mode of the first heat dissipation execution unit, and the simultaneous working mode of the first heat dissipation execution unit and the second heat dissipation execution unit according to the ambient temperature in the power supply host.

[0018] In order to achieve the above-mentioned purpose, in a third aspect, the present invention also provides a long-distance power tunnel monitoring device, which adopts the following technical solution:

[0019] A long-distance electric tunnel monitoring device uses the long-distance electric tunnel monitoring device low-voltage power supply system as described in the first aspect.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention sets a power supply host in a machine room outside the tunnel, which can reduce the received 220V AC power to a preset voltage, and then enter the tunnel to power the online monitoring equipment after reducing the 220V AC power to the preset voltage. Combined with the branch line power supply and branch line protection mode of the multi-core cable, the potential safety hazard in the power tunnel is reduced, and the risk of electric shock in the tunnel is avoided; at the same time, a heat dissipation module is set on the power supply host, and the control module controls the heat dissipation module to switch among three modes: non-starting heat dissipation mode, independent working mode of the first heat dissipation execution unit, and simultaneous working mode of the first heat dissipation execution unit and the second heat dissipation execution unit according to the ambient temperature in the machine. The heat dissipation problem of the equipment in the new environment of the machine room where the power supply host is located is taken into consideration, and through the flexible control of multiple heat dissipation modes, the heat dissipation cost is reduced on the basis of ensuring the heat dissipation effect, and the service life of the power supply host and heat dissipation and power supply related components is guaranteed to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0023] Figure 1 is a system block diagram of Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of a power supply host according to Embodiment 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of a security unit according to Embodiment 1 of the present invention;

[0026] Figure 4 This is a schematic diagram of a power relay according to Embodiment 1 of the present invention;

[0027] Among them, 101, indicator light; 102, heat dissipation module; 1021, first heat dissipation execution unit; 1022, second heat dissipation execution unit; 103, control module and communication module; 104, power output module; 105, processing module; 106, switch button; 107, power conversion module; 201, power input terminal; 202, branch wiring terminal; 203, branch protection unit; 204, surge protection module; 205, current output terminal; 301, power output module; 302, wiring module; 303, power input module; 304, heat dissipation module; 305, voltage boost module. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0030] Embodiment 1:

[0031] As recorded in the background technology, the transmission of 220V AC power requires the use of equipment such as power cables. In a complex tunnel environment, it is easy to cause leakage, which brings safety problems to construction personnel and power cables in the tunnel. Based on this, the present embodiment provides a low-voltage power supply system for long-distance power tunnel monitoring equipment. A power supply host located in a machine room outside the tunnel is used in conjunction with a security unit, a power relay and a multi-core cable to obtain a high-power DC power supply system to power online monitoring equipment in long-distance tunnels, such as online monitoring equipment in tunnels greater than 300 meters.

[0032] like Figure 1As shown, the low-voltage power supply system for remote power tunnel monitoring equipment provided in this embodiment includes a power supply host located in a machine room outside the tunnel, a security unit connected to the power supply host, and a power supply relay located in the tunnel;

[0033] The power relay and the security unit are connected via a multi-core cable; Figure 2 As shown, the power supply host includes a processing module 105 for receiving 220V AC power, a power conversion module 107 capable of reducing the 220V AC power to a preset voltage, a heat dissipation module 102 and a control module; the heat dissipation module 102 includes a first heat dissipation execution unit 1021 and a second heat dissipation execution unit 1022 respectively connected to the control module; the control module is configured to: according to the ambient temperature in the power supply host, control the heat dissipation module 102 to switch between three modes: a non-starting heat dissipation mode, an independent working mode of the first heat dissipation execution unit 1021, and a simultaneous working mode of the first heat dissipation execution unit 1021 and the second heat dissipation execution unit 1022.

[0034] Specifically, a power supply host is arranged in a machine room outside the tunnel, which can reduce the received 220V AC power to a preset voltage. After reducing the 220V AC power to the preset voltage, it enters the tunnel to power the online monitoring equipment. Combined with the branch line power supply and branch line protection method of the multi-core cable, the safety hazards in the power tunnel are reduced and the risk of electric shock in the tunnel is avoided. At the same time, a heat dissipation module 102 is arranged on the power supply host. The control module controls the heat dissipation module to switch between three modes according to the ambient temperature in the machine, namely, the non-starting heat dissipation mode, the independent working mode of the first heat dissipation execution unit 1021, and the simultaneous working mode of the first heat dissipation execution unit 1021 and the second heat dissipation execution unit 1022. The heat dissipation problem of the equipment in the new environment of the machine room where the power supply host is located is taken into consideration, and through the flexible control of multiple heat dissipation modes, the heat dissipation cost is reduced on the basis of ensuring the heat dissipation effect, and the service life of the power supply host and heat dissipation and power supply related components is guaranteed to the greatest extent.

[0035] Optional, such as Figure 2 As shown, the power host includes an indicator light 101, a heat dissipation module 02, a control module and a communication module 103, a power output module 104, a processing module 105, a switch button 106 and a power conversion module 107; wherein, the processing module 105 and the control module and the communication module 103 are arranged in an area at one end of the power host, and the power conversion module 107 is arranged in an area at the other end; when the power conversion module 107 in the power host performs voltage conversion, a large amount of heat will be generated, and the first heat dissipation execution unit 1021 and the second heat dissipation execution unit 1022 are arranged on the side wall of the power host located at one end of the power conversion module 107, thereby improving the heat dissipation effect of the power host.

[0036] In some embodiments, optionally, the power supply host is a high-power rack-mounted power supply host, which is responsible for the output of the power supply, and the maximum output power is 2400W; the power supply host is installed in the computer room, and has a good use environment, the overall ambient temperature in the computer room is stable, and there is no dust or oil pollution; it has on-site control and remote monitoring and remote control capabilities; the power supply host supports short circuit, overvoltage, overload and overheating protection functions, and supports multi-channel parallel current sharing working mode; the power supply host supports output voltage adjustment, the range is 50% to 120% of the rated output voltage, and has a loop feedback self-adjustment function. The output voltage standard of the power supply host can be 48V, and the maximum output current of a single group can be 25A.

[0037] In some embodiments, two sets of power supplies can be used for power supply. The two sets of power supplies have a total maximum output power of 2400W. The output of the power supply is controlled by a main control board, and the switch of a relay can be used to control the start of the power supply. The main control board controls the output voltage and current of the power supply through serial communication, monitors the output current, and prevents overload of the power supply.

[0038] In some embodiments, optionally, the indicator light 101 can display the input, output and communication status of the host. The first heat dissipation execution unit 1021 and the second heat dissipation execution unit 1022 in the heat dissipation module 102 can use fans. The control module is mainly responsible for controlling and adjusting the input current voltage, output current voltage, temperature and feedback voltage of the whole machine. The power output module 104 is the power supply and communication output area. The processing module 105 is mainly used to process the input 220V AC power, set a leakage protector to prevent the leakage of the equipment from damaging the human body, design a lightning protection module to prevent large pulses from appearing at the power input end to damage the host, and design a high-current relay module to control the input of high-voltage 220V with low-voltage 12V. The switch button 106 can be used to switch the local control and remote control switch power supply and reset power supply. The power conversion module 107 can convert 220V to 48V, and is mainly responsible for the voltage conversion function. This module has serious heat generation, and a separate heat dissipation duct is designed. The fan controlled by the temperature switch is used for heat dissipation, and the number of fans started is determined according to the temperature.

[0039] In some embodiments, optionally, the control module is connected to the power conversion module, and the control module adjusts the output voltage of the power conversion module according to the feedback voltage. For example, a local control board is designed and installed in the chassis of the power host to control and monitor the input and output of the power supply, and the data is connected to the platform through an optical fiber or a network port to realize the remote detection and control of the power supply host by the platform; a power flow line is designed in the chassis, and two or more power supply hosts can be used in parallel, and the output power can reach 4800W or higher; the load terminal voltage is monitored, and the data is transmitted to the platform through a network cable or 4G / WIFI, and the data is then transmitted from the platform back to the power supply host, and the host can automatically adjust its output voltage according to the voltage value transmitted back.

[0040] In some embodiments, optionally, when the ambient temperature in the power supply host is lower than the first preset temperature, no heat dissipation is performed; when the ambient temperature in the power supply host is between the first preset temperature and the second preset temperature, the first heat dissipation execution unit 1021 works independently; when the ambient temperature in the power supply host is higher than the second preset temperature, the first heat dissipation execution unit 1021 and the second heat dissipation execution unit 1022 work simultaneously; the first preset temperature is less than the second preset temperature. For example, two switching power supplies are configured to use a fan with a size of 40*40 and an air volume of 20.56CFM for air cooling and heat dissipation, and the fan speed is automatically adjusted according to the detected internal temperature of the power supply; two temperature control switches are configured inside the chassis of the power supply host for connecting two chassis fans with a size of 60*60 and an air volume of 36CFM, and two temperature control points are configured; when the chassis temperature reaches 45°C, the first temperature control switch is activated and the first fan is turned on. When the chassis temperature reaches 50°C, the two fans are started at the same time to ensure the heat dissipation effect of the chassis.

[0041] In some embodiments, in order to improve the flexibility and accuracy of heat dissipation control, optionally, when the difference between the received voltage and the preset voltage is less than the first preset difference, the first preset temperature and the second preset temperature are reduced; when the difference between the received voltage and the preset voltage is greater than the second preset difference, the first preset temperature and the second preset temperature are increased; when the difference between the received voltage and the preset voltage is between the first preset difference and the second preset difference, the first preset temperature and the second preset temperature remain unchanged; the first preset difference is less than the second preset difference. The larger the voltage amplitude to be converted, the larger the corresponding operating power and the more heat dissipation; on the contrary, the smaller the voltage amplitude to be converted, the smaller the corresponding operating power and the less heat dissipation; based on this, in this embodiment, the first preset temperature and the second preset temperature used to judge the three heat dissipation modes are adjusted in real time according to the voltage to be converted, which can avoid the problem of excessive heat dissipation energy consumption on the basis of ensuring the heat dissipation effect.

[0042] like Figure 3 As shown, optionally, the security unit is a symmetrically arranged junction box; the security unit includes two power input terminals 201, a branch wiring terminal 202, a branch protection unit 203, a surge protection module 204 and two current output terminals 205.

[0043] In some embodiments, optionally, the security unit can be a rack-mounted junction box with symmetrical design on the left and right sides, which can be connected to two power supply hosts at the same time. The power input terminal 201 can use a 120A single-core high-current plug-in terminal for wiring; the current is input into the control protection board through a nickel-plated pure copper connecting piece. The branch wiring terminal 202 can be set to 80, and the current is divided into 80 parts and then output separately. The 80 currents diverted by the branch protection unit 203 are separately protected. The surge protection module 204 protects external surge currents from flowing into the power supply host and causing damage to the power supply. The current output terminal 205 can be used to connect 20 pairs of armored cables.

[0044] The security unit has lightning protection, overheating, overcurrent and overload protection, and branching function, which can divide a single power supply output into 80 independent power supply outputs for cables. It has single-line overheating, overcurrent and overload protection functions. It is installed in the computer room and has a good use environment. The overall ambient temperature in the computer room is stable and free of dust and oil. The security unit first divides the line into 40 routes, and the two groups of modules can be divided into 80 separate wiring routes in total. Then, a separate protection circuit is designed for each output route to monitor the current and voltage, and a recoverable fuse is used to protect each route from overcurrent; lightning protection and surge protection modules are designed on the input bus of the junction box to prevent external lightning surges from damaging the power supply.

[0045] like Figure 1 and Figure 4 As shown, a first power relay and a second power relay are arranged between the security unit and the monitoring device; the first power relay and the second power relay both include a power input module 301, a wiring module 302, a voltage boosting module 303, a power output module 304 and a heat dissipation module 305.

[0046] Optionally, the power input module 301 is a cable connector that can meet IP68 protection level. The wiring module 302 is a wiring terminal for wiring harnesses. The voltage boost module 303 is a voltage management area, which can be divided into two layers of circuit boards. The bottom is a boost board. The boost module is close to the bottom shell to facilitate heat transfer to the entire shell for heat dissipation. The upper layer is designed as a wiring board, which can provide wiring for 40 independent wire harnesses. The power output module 304 is a cable connector that can meet IP68 protection level. The heat dissipation module 305 is a heat sink that assists the heat dissipation of the shell.

[0047] In some embodiments, the first power relay and the second power relay have a voltage boosting function, which can boost a 10-60V input voltage to any voltage within the range of 10-60V; have multi-core wire wiring capabilities, which can meet the cable wiring capabilities of 40 wires; have good rated heat dissipation capabilities, and use shell heat dissipation to meet the heat dissipation of the power relay's 2000W power continuous operation; have a waterproof function, and have a protection level of IP68; are installed in underground power tunnels to increase line voltage and reduce line power consumption losses.

[0048] like Figure 1 As shown, optionally, the multi-core cable uses a 40-core armored flame-retardant and waterproof wire, each core is independently connected and powered independently, the single core diameter is 0.9mm, and each core is designed to be independently protected against overcurrent and short circuit.

[0049] In this embodiment, the power supply host is arranged in the machine room, which is safe and reliable, low in temperature, good in heat dissipation, and free of floating dust. The low voltage 48V enters the tunnel, reducing the potential safety hazards in the power tunnel and eliminating the risk of electric shock; the power supply has a maximum output of 2400W, with large output power, and can be remotely fed back for voltage adjustment. The power supply is split-line powered and split-line protected, making it safer and more reliable. An IP68-level waterproof power relay is installed in the tunnel, with an effective boost power of up to 2000W, effectively improving power supply efficiency. The 40-core flame-retardant and waterproof cable is independently powered, which is safe and reliable.

[0050] As shown in Table 1 and Table 2, they are the test results of short-distance high-power power supply capability and long-distance low-power power supply capability.

[0051] Table 1 Electrical capability test data

[0052]

[0053]

[0054] Table 2 Electrical capability test results

[0055]

[0056] Embodiment 2:

[0057] This embodiment provides a low-voltage power supply method for long-distance power tunnel monitoring equipment, using the low-voltage power supply system for long-distance power tunnel monitoring equipment as described in Embodiment 1, including:

[0058] After receiving the 220V AC power, the processing module reduces the voltage of the 220V AC power to a preset voltage through the power conversion module; the monitoring equipment is powered by the security unit, the power relay and the multi-core cable; during the power supply process, the control module controls the heat dissipation module to switch between the three modes of not starting the heat dissipation mode, the independent working mode of the first heat dissipation execution unit 1021, and the simultaneous working mode of the first heat dissipation execution unit 1021 and the second heat dissipation execution unit 1022 according to the ambient temperature in the power host.

[0059] Embodiment 3:

[0060] This embodiment provides a long-distance power tunnel monitoring device, which uses the low-voltage power supply system of the long-distance power tunnel monitoring device described in Example 1. The detection part of the monitoring device can be obtained by conventional technology and will not be described in detail here.

[0061] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. Low voltage power supply system for long-distance power tunnel monitoring equipment, characterized in that: It includes a power supply host located in a machine room outside the tunnel, a security unit connected to the power supply host, and a power supply relay located in the tunnel; The power relay is connected to the security unit via a multi-core cable; the power host includes a processing module for receiving 220V AC power, a power conversion module capable of reducing the voltage of 220V AC power to a preset voltage, a heat dissipation module and a control module; the heat dissipation module includes a first heat dissipation execution unit and a second heat dissipation execution unit respectively connected to the control module; the control module is configured to: according to the ambient temperature in the power host, control the heat dissipation module to switch between three modes: a non-starting heat dissipation mode, an independent working mode of the first heat dissipation execution unit, and a simultaneous working mode of the first heat dissipation execution unit and the second heat dissipation execution unit.

2. The low-voltage power supply system for long-distance power tunnel monitoring equipment according to claim 1, characterized in that: The processing module, control module and communication module are arranged in one end area of ​​the power supply host, and the power conversion module is arranged in the other end area; the first heat dissipation execution unit and the second heat dissipation execution unit are arranged on the side wall of the power supply host located at one end of the power conversion module.

3. The low-voltage power supply system for long-distance power tunnel monitoring equipment according to claim 1, characterized in that: The processing module includes a leakage protector, a lightning protection module and a high-current relay.

4. The low-voltage power supply system for long-distance power tunnel monitoring equipment according to claim 1, characterized in that: When the ambient temperature inside the power supply host is lower than the first preset temperature, no heat dissipation is performed; when the ambient temperature inside the power supply host is between the first preset temperature and the second preset temperature, the first heat dissipation execution unit works independently; when the ambient temperature inside the power supply host is higher than the second preset temperature, the first heat dissipation execution unit and the second heat dissipation execution unit work simultaneously; the first preset temperature is lower than the second preset temperature.

5. The low-voltage power supply system for long-distance power tunnel monitoring equipment according to claim 4, characterized in that: When the difference between the received voltage and the preset voltage is less than the first preset difference, the first preset temperature and the second preset temperature are reduced; when the difference between the received voltage and the preset voltage is greater than the second preset difference, the first preset temperature and the second preset temperature are increased; when the difference between the received voltage and the preset voltage is between the first preset difference and the second preset difference, the first preset temperature and the second preset temperature remain unchanged; The first preset difference is smaller than the second preset difference.

6. The low-voltage power supply system for long-distance power tunnel monitoring equipment according to claim 1, characterized in that: The control module is connected to the power conversion module, and the control module adjusts the output voltage of the power conversion module according to the feedback voltage.

7. The low-voltage power supply system for long-distance power tunnel monitoring equipment according to claim 1, characterized in that: The security unit is a symmetrically arranged junction box; the security unit comprises two power input terminals, a branch wiring terminal, a surge protection module, a branch protection unit and two current output terminals.

8. The low-voltage power supply system for long-distance power tunnel monitoring equipment according to claim 1, characterized in that: A first power relay and a second power relay are arranged between the security unit and the monitoring device; the first power relay and the second power relay both include a power input module, a wiring module, a voltage boost module, a power output module and a heat dissipation module.

9. A low voltage power supply method for long-distance power tunnel monitoring equipment, characterized in that: A low-voltage power supply system for long-distance power tunnel monitoring equipment according to any one of claims 1 to 8 is used, comprising: After receiving the 220V AC power, the processing module reduces the voltage of the 220V AC power to a preset voltage through the power conversion module; the monitoring equipment is powered by the security unit, the power relay and the multi-core cable; during the power supply process, the control module controls the heat dissipation module to switch between the three modes of not starting the heat dissipation mode, the independent working mode of the first heat dissipation execution unit, and the simultaneous working mode of the first heat dissipation execution unit and the second heat dissipation execution unit according to the ambient temperature in the power supply host.

10. Long-distance power tunnel monitoring equipment, characterized in that: A low-voltage power supply system for long-distance power tunnel monitoring equipment as described in any one of claims 1 to 8 is used.

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