An online monitoring device for remotely diagnosing a temperature rising state in a ring main unit

Abstract

The application discloses an online monitoring device for remotely diagnosing a temperature rising state in a ring net cabinet, which comprises a ring net cabinet body, a protective shell and multiple groups of cable joints which are arranged in the ring net cabinet body, and a cabinet door and a handle which are arranged on the ring net cabinet body, and further comprises a buffer mechanism which is arranged in the ring net cabinet body and a self-adaptive pressure balance mechanism which is in communication with the buffer mechanism, wherein the self-adaptive pressure balance mechanism comprises an inner container, a first partition plate and a second partition plate are arranged in the inner container, and the inner container is divided into a temperature measuring cavity and an electrical cavity by the first partition plate. The application reduces the possibility that external humid air is sucked into the electrical cavity, reduces the risk that condensation is generated in the electrical cavity due to humidity accumulation, and is helpful to improve the temperature measuring stability and accuracy of the temperature sensor.

Description

Technical Field

[0001] This invention relates to the field of online monitoring technology for power equipment, and in particular to an online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit. Background Technology

[0002] A ring main unit (RMU) is a metal-enclosed switchgear used in power distribution networks. It is named for its ring-shaped power supply structure in the main circuit. It integrates high-voltage electrical components such as circuit breakers, disconnectors, fuses, and current transformers into a sealed cabinet for the distribution, control, and protection of power lines. In daily operation, the RMU is in a closed state, but there are tiny gas exchange channels in the gaps of its cabinet door and cable entry / exit holes. Under the influence of diurnal temperature differences and periodic load changes, the thermal expansion and contraction of the gas inside the cabinet will produce a breathing effect, which may lead to the gradual accumulation of water vapor and maintain a high relative humidity inside the cabinet for a long time.

[0003] Temperature monitoring devices typically used in ring main units often employ sealing rings or adhesive seals for their housings. Over long-term use, these seals may age or the adhesive may crack and fail, leading to minute gas exchanges within the internal cavity as temperature changes occur. Moisture accumulates inside the cavity and condenses on the sensor contact surface. When this condensate evaporates, it absorbs heat, causing the measured temperature data to be systematically lower than the actual reading. This results in remote diagnostic systems receiving abnormal data that cannot be distinguished from the true temperature rise—for example, the device may be overheating but displaying as normal, leading to missed alarms and affecting the reliability of remote temperature status diagnosis. Therefore, providing an online monitoring device for remotely diagnosing the temperature rise status within ring main units is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] One objective of this invention is to provide an online monitoring device for remotely diagnosing the temperature rise status within a ring main unit, thereby solving the aforementioned technical problems. The technical solution of this invention is as follows: An online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to an embodiment of the present invention includes a ring main unit body, a protective shell installed inside the ring main unit body, and multiple sets of cable connectors. The ring main unit body is provided with a cabinet door and a handle. The device further includes: a buffer mechanism located inside the ring main unit body; and an adaptive pressure balancing mechanism connected to the buffer mechanism. The adaptive pressure balancing mechanism includes an inner liner, inside which are provided a first partition and a second partition. The inner liner is divided into a temperature measuring chamber and an electrical chamber by the first partition, and the second partition divides the electrical chamber into a first mounting chamber and a second mounting chamber. The device includes a miniature flexible airbag. The second mounting cavity contains a circuit board, battery, and wireless module. One end of the miniature flexible airbag is closed, and the other end has an airtight connector. The other end of the miniature flexible airbag is fixed to the second partition via the airtight connector. The second partition has air vents, and the airtight connector communicates with the second mounting cavity through these air vents. The temperature measuring cavity contains multiple temperature sensors. A heat-conducting plate is located on the side wall of the protective shell near the cable connector, and the sensing end of each temperature sensor is thermally coupled to the heat-conducting plate. The temperature monitoring mechanism is located inside the inner liner.

[0005] Furthermore, the buffer mechanism includes an isolation strip located between the protective shell and the inner liner. The protective shell is fixedly installed on the inner wall of one side of the ring main unit. A breathing balance channel is provided on the electrical cavity, which connects the electrical cavity to the isolation strip. The breathing balance channel is equipped with a waterproof and breathable membrane and a micro-pressure one-way valve inside.

[0006] By adopting the above technical solution, when the internal ambient temperature of the ring main unit changes drastically, the isolation strip can slow down the drastic temperature fluctuations around the inner tank, thereby reducing the driving force of the breathing effect caused by excessive temperature difference inside the inner tank. Through the synergistic effect of the breathing balance channel, waterproof and breathable membrane and micro-pressure one-way valve, controlled gas exchange between the electrical cavity and the isolation strip is realized. This not only ensures pressure safety under extreme working conditions, but also effectively prevents liquid water, dust and moisture from entering the electrical cavity, thereby significantly improving the long-term operational reliability and anti-condensation performance of the device inside the ring main unit.

[0007] Furthermore, the temperature monitoring mechanism includes multiple internal coupling coils, which are fixedly installed on the inner wall of the temperature measuring cavity. The sensing end and the fixed end of the temperature sensor are both located inside the temperature measuring cavity. The output end of the temperature sensor is connected to the corresponding internal coupling coil. An external coupling coil is provided in the electrical cavity at a position opposite to the internal coupling coil. The external coupling coil is electrically connected to the circuit board.

[0008] By adopting the above technical solution, the sensing end and fixed end of the temperature sensor are completely built into the sealed temperature measuring cavity. The internal coupling coil converts the electrical signal output by the sensor into a magnetic field signal, which is transmitted to the external coupling coil in the electrical cavity through the temperature measuring cavity wall in a non-contact manner. The signal is then processed by the circuit board and transmitted to the remote monitoring backend via a wireless module. This completely solves the long-term reliability problems in traditional solutions, such as sealing leakage caused by metal pins passing through the cavity wall, heat loss along the pins causing low temperature readings, and pin oxidation and corrosion. It achieves perfect sealing of the temperature measuring cavity without perforation, permanent sealing with dry nitrogen, and long-term stable operation without maintenance.

[0009] The beneficial effects of this invention are: This invention can suppress the respiratory effect and prevent condensation. Through the connection between the micro flexible airbag and the electrical cavity, the air pressure can be autonomously regulated. When the temperature rises, it absorbs gas and when it drops, it releases gas, effectively reducing the gas exchange between the electrical cavity and the outside. At the same time, the isolation strip acts as a thermal buffer layer to reduce the impact of sudden temperature changes on the inner liner, thereby reducing the driving force of the respiratory effect from the source and avoiding the inhalation of external humid air and the formation of internal condensation. This invention completely integrates the temperature sensor into a sealed temperature measurement cavity, and achieves non-contact magnetic coupling signal transmission through an internal coupling coil and an external coupling coil. This completely avoids heat loss and sealing leakage caused by metal pins passing through the cavity wall, eliminates the negative temperature measurement deviation caused by condensation evaporation and heat absorption, ensures that the remote diagnostic system receives real, continuous, and reliable temperature data, and prevents missed reports. Attached Figure Description

[0010] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of an online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit, as proposed in this invention. Figure 2 This is a schematic diagram of the protective shell structure of an online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit, as proposed in this invention.

[0011] Figure 3 This is a schematic diagram of the temperature monitoring mechanism of an online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit, as proposed in this invention.

[0012] Figure 4 This is a schematic diagram of the mounting hole structure of an online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit, as proposed in this invention.

[0013] Figure 5 This is a top view of the temperature monitoring mechanism of an online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit, as proposed in this invention.

[0014] Figure 6 This is a schematic diagram of the adaptive pressure balancing mechanism of an online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit, as proposed in this invention.

[0015] Figure 7 for Figure 6 An enlarged schematic diagram of the structure at point A.

[0016] Figure 8 This is a cross-sectional view of the buffer mechanism of an online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit, as proposed in this invention.

[0017] Figure 9 for Figure 8 Enlarged schematic diagram of the structure at point B.

[0018] In the diagram: 1. Ring main unit body; 2. Cabinet door; 3. Handle; 4. Cable connector; 5. Protective shell; 6. Temperature sensor; 7. Column; 8. Heat-conducting plate; 9. Mounting hole; 10. Inner liner; 11. First partition; 12. Isolation strip; 13. Heat-conducting platform; 14. Limiting sleeve; 15. First magnetic core; 16. First wire; 17. Circuit board; 18. Battery; 19. Wireless module; 20. Miniature flexible airbag; 21. Second magnetic core; 22. Second wire; 23. Airtight joint; 24. Micro-pressure one-way valve; 25. Waterproof and breathable membrane; 27. Temperature measuring chamber; 28. Electrical chamber; 30. Second partition. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0020] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 8 and Figure 9An online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit includes a ring main unit body 1, a protective shell 5 installed inside the ring main unit body 1, and multiple sets of cable connectors 4. The ring main unit body 1 is provided with a cabinet door 2 and a handle 3. It also includes: a buffer mechanism located inside the ring main unit body 1; and an adaptive pressure balancing mechanism connected to the buffer mechanism. The adaptive pressure balancing mechanism includes an inner liner 10, inside which are provided a first partition 11 and a second partition 30. The inner liner 10 is divided into a temperature measuring chamber 27 and an electrical chamber 28 by the first partition 11. The second partition 30 divides the electrical chamber 28 into a first mounting chamber and a second mounting chamber. The first mounting chamber contains... The device includes a miniature flexible airbag 20. Inside the second mounting cavity, there is a circuit board 17, a battery 18, and a wireless module 19. One end of the miniature flexible airbag 20 is closed, and the other end of the miniature flexible airbag 20 is provided with an airtight connector 23. The other end of the miniature flexible airbag 20 is fixed to the second partition 30 through the airtight connector 23. The second partition 30 has an air guide hole, and the airtight connector 23 is connected to the second mounting cavity through the air guide hole. Inside the temperature measuring cavity 27, there are multiple temperature sensors 6. On the side wall of the protective shell 5 near the cable connector 4, there is a heat-conducting plate 8. The sensing end of the temperature sensor 6 is thermally coupled to the heat-conducting plate 8. The temperature monitoring mechanism is located inside the inner liner 10.

[0021] It should be noted that the temperature monitoring mechanism is located inside the inner liner 10, and its specific structure includes, but is not limited to, signal conditioning circuits and analog-to-digital converters.

[0022] Among them, the micro flexible airbag 20 is a corrugated silicone rubber bellows. The corrugated silicone rubber bellows can achieve precise autonomous adjustment of the internal air pressure of the electrical cavity 28 through high volume compensation capability, fast response, long life cycle and good air tightness, effectively suppressing the breathing effect and condensation risk, thereby ensuring the long-term reliable operation of the device in the complex environment of the ring main unit.

[0023] In the specific implementation process, the buffer mechanism includes an isolation strip 12, which is located between the protective shell 5 and the inner liner 10. The protective shell 5 is fixedly installed on the inner wall of one side of the ring main unit 1. A breathing balance channel is provided on the electrical cavity 28, which connects the electrical cavity 28 and the isolation strip 12. The breathing balance channel is equipped with a waterproof and breathable membrane 25 and a micro-pressure one-way valve 24. The waterproof and breathable membrane 25 in the breathing balance channel allows gas to flow unidirectionally from the electrical cavity 28 to the isolation strip 12, so that the sensitive temperature sensor 6 probe is permanently sealed in a dry, non-condensing temperature measuring chamber 27, completely eliminating the possibility of contact with the device. By preventing contact with accumulated internal moisture, when the internal ambient temperature of the ring main unit 1 changes drastically, the isolation strip 12 can slow down the drastic temperature fluctuations around the inner liner 10, thereby reducing the driving force of the breathing effect caused by excessive temperature difference inside the inner liner 10. Through the synergistic effect of the breathing balance channel, the waterproof and breathable membrane 25 and the micro-pressure one-way valve 24, controlled gas exchange between the electrical cavity 28 and the isolation strip 12 is realized. This not only ensures pressure safety under extreme working conditions, but also effectively prevents liquid water, dust and moisture from entering the electrical cavity 28, thereby significantly improving the long-term operational reliability and anti-condensation performance of the device inside the ring main unit 1.

[0024] It should be noted that the waterproof and breathable membrane 25 can be made of EEPROM, which can effectively prevent liquid water from entering the electrical cavity 28.

[0025] Among them, the isolation zone 12 is a closed annular cavity structure. The closed structure completely isolates the interior of the isolation zone 12 from the outside world, preventing moisture convection intrusion, dust pollution and condensation contact, and keeping the interior dry and clean for a long time.

[0026] In addition, the protective shell 5 has multiple pillars 7 inside, and the inner liner 10 is fixedly installed inside the protective shell 5 through the multiple pillars 7.

[0027] Specifically, when the cable connector 4 inside the ring main unit 1 generates heat due to poor contact, excessive load, or other reasons, the heat is first transferred to the heat-conducting plate 8 on the side wall of the protective shell 5. Since the sensing end of the temperature sensor 6 is in a thermally coupled state with the heat-conducting plate 8, the heat-conducting plate 8 transfers the heat on the monitored cable connector 4 to the sensing end of the temperature sensor 6 with low loss and fast speed, so that the temperature sensor 6 can sense the temperature rise of the cable connector 4. Then, the temperature sensor 6 converts the sensed temperature signal into an electrical signal such as a change in resistance value. This electrical signal is processed by the temperature monitoring mechanism, thereby converting the analog signal output by the temperature sensor 6 into a digital signal, and then wirelessly transmitting it to the remote monitoring backend through the wireless module 19, thereby realizing the remote diagnostic function.

[0028] During the operation of the device, due to the diurnal temperature difference and periodic load changes inside the ring main unit 1, the temperature inside the electrical cavity 28 will fluctuate. When the temperature inside the electrical cavity 28 rises, the gas inside the cavity expands and the pressure increases. The excess gas enters the micro flexible airbag 20 through the air guide hole and airtight connector 23 on the second partition 30, causing the volume of the micro flexible airbag 20 to expand, thereby absorbing the pressure increase inside the electrical cavity 28. When the temperature inside the electrical cavity 28 drops, the gas inside the cavity contracts and the pressure decreases. Under the action of the pressure difference, the gas inside the micro flexible airbag 20 automatically flows back to the second mounting cavity and the entire electrical cavity 28 through the airtight connector 23 and air guide hole, compensating for the volume contraction caused by the temperature drop. Through the above process, the micro flexible airbag 20 absorbs gas when the pressure rises and releases gas when the pressure drops, realizing the autonomous regulation of the air pressure inside the electrical cavity 28, thereby effectively suppressing the breathing effect caused by temperature fluctuations, that is, reducing the gas exchange between the electrical cavity 28 and the external environment, and preventing the external humid air from being drawn into the electrical cavity 28.

[0029] Furthermore, when the internal ambient temperature of the ring main unit 1 changes abruptly, the isolation strip 12 located between the protective shell 5 and the inner liner 10 plays a thermal buffering role. Since the isolation strip 12 is a closed annular cavity structure, the air layer inside it has low thermal conductivity, which can slow down the rapid heat transfer between the protective shell 5 and the inner liner 10. Therefore, when the protective shell 5 rapidly heats up or cools down due to changes in the external ambient temperature, the isolation strip 12 can delay the conduction of this temperature change to the inner liner 10, reducing the amplitude and rate of temperature change inside the inner liner 10, thereby further... This reduces the driving force for the breathing effect caused by excessive temperature difference inside the inner liner 10. When the abnormal change in air pressure inside the electrical cavity 28 exceeds the adjustment capability of the micro flexible airbag 20, the micro pressure one-way valve 24 opens at a preset pressure threshold, allowing a small amount of gas to exchange between the electrical cavity 28 and the isolation strip 12 to prevent damage to the micro flexible airbag 20. This device reduces the possibility of external humid air being drawn into the electrical cavity 28 and reduces the risk of condensation caused by moisture accumulation inside the electrical cavity 28, which helps to improve the temperature measurement stability and accuracy of the temperature sensor 6.

[0030] Please refer to Figure 3 , Figure 5 , Figure 6 and Figure 7 In a preferred embodiment, the temperature monitoring mechanism includes multiple internal coupling coils, which are fixedly installed on the inner wall of the temperature measuring cavity 27. The sensing end and the fixed end of the temperature sensor 6 are both located inside the temperature measuring cavity 27. The output end of the temperature sensor 6 is connected to the corresponding internal coupling coil. An external coupling coil is provided in the electrical cavity 28 at a position opposite to the internal coupling coil. The external coupling coil is electrically connected to the circuit board 17.

[0031] It should be noted that the temperature measuring cavity 27 and the first partition 11 are both made of non-metallic materials such as PEEK and ceramics, and are not shielded against magnetic fields. In particular, the outer wall of the temperature measuring cavity 27 that contacts the heat-conducting plate 8 is made of ceramic with high thermal conductivity or nickel-plated copper block, thereby improving its thermal conductivity.

[0032] The temperature measuring cavity 27 is a sealed cavity and its interior is filled with dry nitrogen. In practice, the cavity wall of the temperature measuring cavity 27 can be fully sealed by laser welding, thus completely eliminating the gas leakage path.

[0033] In the specific implementation process, the internal coupling coil includes a first magnetic core 15 and a first wire 16 wound on the first magnetic core 15, and the external coupling coil includes a second magnetic core 21 and a second wire 22 wound on the second magnetic core 21.

[0034] The temperature measuring cavity 27 has multiple heat-conducting platforms 13 on one inner wall. Thermal grease is applied between the heat-conducting platform 13 and the sensing end of the corresponding temperature sensor 6. A limiting sleeve 14 is threadedly connected to the outer wall of the heat-conducting platform 13. The limiting sleeve 14 presses the sensing end of the temperature sensor 6 onto the heat-conducting platform 13. The heat-conducting platform 13, thermal grease and limiting sleeve 14 work together to ensure that the sensing end of the temperature sensor 6 is in close contact with the heat-conducting platform 13 for a long time without being affected by vibration or thermal cycling. At the same time, it eliminates air gap error, insufficient clamping force error and multi-point temperature inconsistency error, and improves the accuracy and reliability of the device's online monitoring.

[0035] Specifically, by completely embedding the sensing end and fixed end of the temperature sensor 6 into the sealed temperature measuring cavity 27, and using the internal coupling coil to convert the electrical signal output by the sensor into a magnetic field signal, the signal is transmitted to the external coupling coil in the electrical cavity 28 through the wall of the temperature measuring cavity 27 in a non-contact manner. The signal is then processed by the circuit board 17 and transmitted to the remote monitoring backend via the wireless module 19. This completely solves the long-term reliability problems in the traditional solution, such as sealing leakage caused by metal pins passing through the cavity wall, low temperature readings caused by heat loss along the pins, and pin oxidation and corrosion. It achieves perfect sealing of the temperature measuring cavity 27 without perforation, permanent sealing with dry nitrogen, and long-term stable operation without maintenance.

[0036] Please refer to Figure 3 and Figure 4In a preferred embodiment, the bottom of the protective shell 5 has multiple mounting holes 9, and an EPTFE membrane is installed inside the mounting holes 9. In a specific implementation, the multiple mounting holes 9 are arranged in a stepped labyrinth. The stepped labyrinth arrangement of the mounting holes 9 and the EPTFE membrane, together with the EPTFE membrane, forms multiple barriers by extending the airflow path and increasing resistance, thereby reducing the gas exchange rate and effectively suppressing the breathing effect. In addition, the EPTFE membrane allows air molecules, including water vapor, to pass freely to balance the internal and external air pressure, thereby reducing the air pressure difference on both sides of the shell and fundamentally alleviating the severity of the breathing effect. At the same time, the membrane can effectively prevent liquid water and dust from entering the interior of the protective shell 5 and prevent direct impact from the external environment.

[0037] Working principle: When the cable connector 4 inside the ring main unit 1 generates heat due to poor contact, overload, or other reasons, the heat is first transferred to the heat-conducting plate 8 on the side wall of the protective shell 5. Since the sensing end of the temperature sensor 6 is thermally coupled to the heat-conducting plate 8, the heat-conducting plate 8 transfers the heat from the monitored cable connector 4 to the sensing end of the temperature sensor 6 with low loss and speed, allowing the temperature sensor 6 to sense the temperature rise of the cable connector 4. Then, the temperature sensor 6 converts the sensed temperature signal into an electrical signal, such as a change in resistance. This electrical signal is processed by the temperature monitoring mechanism, thereby converting the analog signal output by the temperature sensor 6 into a digital signal, which is then transmitted via a wireless module. 19. Data is wirelessly transmitted to the remote monitoring backend to achieve remote diagnostic functions. During device operation, due to the diurnal temperature difference and periodic load changes inside the ring main unit 1, the temperature inside the electrical cavity 28 fluctuates. When the temperature inside the electrical cavity 28 rises, the gas inside the cavity expands and the pressure increases. The excess gas enters the micro-flexible airbag 20 through the air guide hole on the second partition 30 and the airtight joint 23, causing the volume of the micro-flexible airbag 20 to expand, thereby absorbing the pressure increase inside the electrical cavity 28. When the temperature inside the electrical cavity 28 decreases, the gas inside the cavity contracts and the pressure decreases. Under the action of the pressure difference, the gas inside the micro-flexible airbag 20 passes through the airtight joint 23 and... The air vent automatically returns to the second mounting cavity and the entire electrical cavity 28, compensating for volume contraction caused by temperature decrease. Through this process, the micro-flexible airbag 20 absorbs gas when the pressure increases and releases gas when the pressure decreases, achieving autonomous regulation of the internal air pressure of the electrical cavity 28. This effectively suppresses the breathing effect caused by temperature fluctuations, reducing gas exchange between the electrical cavity 28 and the external environment, and preventing external humid air from being drawn into the electrical cavity 28. In addition, when the internal ambient temperature of the ring main unit 1 changes abruptly, the isolation strip 12 located between the protective shell 5 and the inner liner 10 plays a thermal buffering role. Since the isolation strip 12 is a closed annular cavity structure, the air inside it... The layer has a low thermal conductivity, which can slow down the rapid transfer of heat between the protective shell 5 and the inner liner 10. Therefore, when the protective shell 5 heats up or cools down rapidly due to changes in the external ambient temperature, the isolation strip 12 can delay the conduction of this temperature change to the inner liner 10, thereby reducing the amplitude and rate of temperature change inside the inner liner 10. This further reduces the driving force of the breathing effect caused by excessive temperature difference inside the inner liner 10. When the abnormal change in air pressure inside the electrical cavity 28 exceeds the adjustment capability of the micro flexible airbag 20, the micro pressure one-way valve 24 opens at a preset pressure threshold, allowing a small amount of gas to be exchanged between the electrical cavity 28 and the isolation strip 12 to prevent damage to the micro flexible airbag 20.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit, characterized in that, The system includes a ring main unit (1), a protective shell (5) installed inside the ring main unit (1), and multiple sets of cable connectors (4). The ring main unit (1) is equipped with a cabinet door (2) and a handle (3). It also includes: Buffer mechanism: located inside the ring main unit (1); Adaptive pressure balancing mechanism: Connected to the buffer mechanism, the adaptive pressure balancing mechanism includes an inner liner (10). The inner liner (10) has a first partition (11) and a second partition (30) inside. The inner liner (10) is divided into a temperature measuring chamber (27) and an electrical chamber (28) by the first partition (11). The second partition (30) divides the electrical chamber (28) into a first mounting chamber and a second mounting chamber. The first mounting chamber is provided with a miniature flexible airbag (20). The second mounting chamber is provided with a circuit board (17), a battery (18), and a wireless module (19). One end of (20) is closed, and the other end of the micro flexible airbag (20) is provided with an airtight connector (23). The other end of the micro flexible airbag (20) is fixed to the second partition (30) through the airtight connector (23). The second partition (30) is provided with an air guide hole. The airtight connector (23) is connected to the second mounting cavity through the air guide hole. The temperature measuring cavity (27) is provided with multiple temperature sensors (6). The protective shell (5) is provided with a heat-conducting plate (8) on the side wall near the cable connector (4). The sensing end of the temperature sensor (6) is thermally coupled to the heat-conducting plate (8). Temperature monitoring mechanism: located inside the inner liner (10).

2. The online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to claim 1, characterized in that, The micro flexible airbag (20) is a corrugated silicone rubber tube.

3. The online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to claim 1, characterized in that, The buffer mechanism includes an isolation strip (12), which is located between the protective shell (5) and the inner liner (10). The protective shell (5) is fixedly installed on one side of the inner wall of the ring main body (1). A breathing balance channel is provided on the electrical cavity (28), which connects the electrical cavity (28) and the isolation strip (12). The breathing balance channel is provided with a waterproof and breathable membrane (25) and a micro-pressure one-way valve (24).

4. The online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to claim 3, characterized in that, The isolation strip (12) is a closed annular cavity structure.

5. The online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to claim 1, characterized in that, The protective shell (5) has multiple pillars (7) inside, and the inner liner (10) is fixedly installed inside the protective shell (5) through the multiple pillars (7).

6. The online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to claim 1, characterized in that, The temperature monitoring mechanism includes multiple internal coupling coils, which are fixedly installed on the inner wall of the temperature measuring cavity (27). The sensing end and the fixed end of the temperature sensor (6) are both located inside the temperature measuring cavity (27). The output end of the temperature sensor (6) is connected to the corresponding internal coupling coil. An external coupling coil is provided in the electrical cavity (28) at a position opposite to the internal coupling coil. The external coupling coil is electrically connected to the circuit board (17).

7. The online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to claim 6, characterized in that, The temperature measuring chamber (27) is a sealed cavity and the interior of the temperature measuring chamber (27) is filled with dry nitrogen gas.

8. The online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to claim 7, characterized in that, The internal coupling coil includes a first magnetic core (15) and a first wire (16) wound on the first magnetic core (15), and the external coupling coil includes a second magnetic core (21) and a second wire (22) wound on the second magnetic core (21).

9. The online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to claim 1, characterized in that, The inner wall of the temperature measuring cavity (27) is provided with a plurality of heat-conducting platforms (13). The heat-conducting platforms (13) are coated with thermal grease between the sensing end of the corresponding temperature sensor (6). The outer wall of the heat-conducting platform (13) is connected by a threaded sleeve (14). The sleeve (14) presses the sensing end of the temperature sensor (6) onto the heat-conducting platform (13).

10. The online monitoring device for remotely diagnosing the temperature rise status inside a ring main unit according to claim 1, characterized in that, The bottom of the protective shell (5) is provided with multiple mounting holes (9), and an EPTFE membrane is provided in the mounting holes (9).

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