Environment-friendly gas insulation ring main unit

Abstract

The invention relates to the technical field of insulated metal-enclosed switchgear, and discloses an environment-friendly gas-insulated ring main unit, which comprises a cabinet body, the cabinet body comprises a pressure relief chamber and a primary loop insulation chamber, a heat dissipation cylinder is fixedly arranged at the bottom in the pressure relief chamber, the top of the heat dissipation cylinder is fixedly connected with a pressure relief pipe, and the pressure relief pipe is fixedly connected with the primary loop insulation chamber. A first electromagnetic valve is fixedly arranged on a pipe body of the pressure relief pipe, and an air storage mechanism is arranged in the heat dissipation cylinder. A plurality of cabinet bodies are combined to form a ring main unit group, when the temperature of one ring main unit is abnormally increased, a corresponding first electromagnetic valve is opened, a sliding plate moves under the action of air pressure in a corresponding primary loop insulation chamber to form a gas storage cavity, insulation gas loss is avoided while pressure relief is performed, and cooling is performed; and the plurality of heat dissipation cylinders can be communicated in sequence, so that the air pressure in the primary circuit insulation chamber can be further improved to achieve a closed pressure relief effect in a cabinet deformation pressure and bursting pressure interval.

Description

Technical Field

[0001] The invention relates to the technical field of insulated metal-enclosed switchgear, in particular to an environmentally friendly gas-insulated ring network cabinet. Background Art

[0002] Environmentally friendly gas insulated ring main unit is an environmentally friendly gas fully insulated metal enclosed switchgear used for power system transmission and distribution. The cabinet of environmentally friendly gas fully insulated metal enclosed switchgear is divided into several areas, including cable room, mechanism room, low voltage room, pressure relief room and primary circuit insulation room. The primary circuit insulation room is equipped with primary circuit electrical components and filled with environmentally friendly gas as an insulating medium to ensure the safe transmission and distribution of the power system. A pressure relief device is arranged between the primary circuit insulation room and the pressure relief room. The existing pressure relief device is usually a bursting disc. When an arcing fault occurs in the primary circuit insulation room, the expansion pressure of the insulating medium increases. When the bursting pressure is reached, the bursting disc ruptures and releases high-temperature and high-pressure gas.

[0003] However, during the use of traditional environmentally friendly gas fully insulated metal-enclosed switchgear, when the electrical components are experiencing unexpected situations such as aging, failure, sealing failure, poor heat dissipation, etc., the primary circuit insulation chamber is prone to abnormal temperature rise, causing the environmentally friendly gas to expand. Although it is not enough to reach the bursting pressure, the gas expansion can easily cause the cabinet of the primary circuit insulation chamber to deform, affecting the sealing and structural safety of the primary circuit insulation chamber. At the same time, when an arc fault occurs due to short circuit, improper inflation, operational error, etc., the cabinet has already deformed within a safe range before the environmentally friendly gas expands due to heat to reach the bursting pressure, affecting the subsequent use of the cabinet. Summary of the invention

[0004] In view of the shortcomings of the existing environmentally friendly gas fully insulated metal-enclosed switchgear during use raised in the background technology, the present invention provides an environmentally friendly gas insulated ring network cabinet, which has the advantages of avoiding deformation of the cabinet body, avoiding loss of environmentally friendly gas and facilitating the detection of sealing conditions, thereby solving the technical problems raised in the above background technology.

[0005] The present invention provides the following technical solution: an environmentally friendly gas insulated ring main unit, comprising a cabinet body, the cabinet body comprising a pressure relief chamber and a primary circuit insulation chamber, a heat dissipation cylinder is fixedly arranged at the bottom of the pressure relief chamber, a pressure relief pipe is fixedly connected to the top of the heat dissipation cylinder, a No. 1 solenoid valve is fixedly arranged on the body of the pressure relief pipe, and a gas storage mechanism is arranged in the heat dissipation cylinder; A monitor is fixedly installed in the primary circuit insulation chamber of the cabinet, and the monitor is used to detect the gas state in the primary circuit insulation chamber. The gas storage mechanism can passively move under the action of air pressure to cooperate with the heat dissipation tube to form a gas storage cavity and give the gas a certain pressure. The gas storage mechanism can cooperate with the gas storage mechanisms in other cabinets outside the corresponding cabinet and be connected to form a joint pressure relief when the gas storage cavity of the gas storage mechanism reaches the maximum.

[0006] Preferably, the air storage mechanism includes a sliding plate, a pressure relief groove is provided on the top of the sliding plate, a No. 1 annular plate for closing the pressure relief groove is slidably sleeved on the outside of the sliding plate, a No. 1 spring is fixedly connected to the top of the No. 1 annular plate, a telescopic bag is fixedly connected to the top of the sliding plate, a spring seat is fixedly connected to the bottom of the heat dissipation tube, a balance spring is fixedly connected to the top of the spring seat, and the balance spring is used to push the sliding plate to move toward the top relative to the heat dissipation tube.

[0007] Preferably, a top ring is fixedly connected to the bottom of the heat dissipation tube, the shape of the top ring is matched with the shape of the No. 1 annular plate, the position of the top ring corresponds to the position of the No. 1 annular plate, a No. 2 annular plate is slidably sleeved on the inner side of the top ring, a No. 2 spring is fixedly connected to the bottom of the No. 2 annular plate, a distribution cavity is opened inside the top ring, and the No. 2 annular plate is used to close an opening at one end of the distribution cavity.

[0008] Preferably, protrusions for limiting the sliding range of the No. 1 annular plate are fixedly provided on both sides close to the top, and protrusions for limiting the sliding range of the No. 2 annular plate are fixedly connected to the inner side of the No. 2 annular plate, and the sliding plate is slidably sleeved with the heat dissipation tube.

[0009] Preferably, a sliding sealing mechanism for sealing the gap between the sliding plate and the heat dissipation cylinder is fixedly provided on the outer side of the sliding plate.

[0010] Preferably, the several cabinets are combined to form a ring network cabinet group, the number of cabinets in the ring network cabinet group is at least two, a No. 1 connecting pipe is fixedly provided at the bottom of the outer side of the heat dissipation cylinder, one end of the No. 1 connecting pipe is connected to the top of the heat dissipation cylinder in the adjacent cabinet, and a No. 1 one-way valve is fixedly provided on the pipe body of the No. 1 connecting pipe.

[0011] Preferably, a No. 2 connecting pipe for environmental protection gas reflux is fixedly connected to the top of the heat dissipation tube, one end of the No. 2 connecting pipe is fixedly connected to the heat dissipation tube in another cabinet in the ring network cabinet group, a No. 2 one-way valve is fixedly provided at one end of the No. 2 connecting pipe body, and a No. 2 solenoid valve is fixedly provided at the other end of the No. 2 connecting pipe.

[0012] Preferably, a limit ring is fixedly connected to the top of the heat dissipation tube, and a pressure sensor for detecting the pressure of the sliding plate in the reset state is fixedly arranged at the bottom of the limit ring.

[0013] Preferably, a permanent magnet is fixedly arranged in the middle of the sliding plate, an induction coil is arranged at the bottom of the outer side of the heat dissipation tube, and a current sensor is fixedly arranged on one side of the induction coil.

[0014] The present invention has the following beneficial effects: 1. The present invention opens the No. 1 solenoid valve when the monitor detects that the environmental gas pressure in the insulating room of the primary circuit increases, so that the sliding plate slides under the action of the air pressure to overcome the elastic force of the balance spring, and the sliding plate cooperates with the telescopic bag to form a gas storage cavity. When the sliding plate slides to the bottom, the No. 1 annular plate and the No. 2 annular plate are pushed open, and at the same time, the pressure relief groove is connected with the distribution groove, so that the expanded gas can enter the No. 1 connecting pipe through the pressure relief groove and the distribution groove, and enter another heat dissipation cylinder in the ring network cabinet group in one direction, and jointly form a closed gas storage. In addition, through the cooperation of a plurality of heat dissipation cylinders to dissipate heat, the size of the space that can be closed and decompressed when the insulating gas pressure reaches the range of the deformation pressure and the bursting pressure of the cabinet is increased, so that the cabinet is prevented from being deformed due to air pressure and the loss of insulating gas is further avoided, thereby improving the practicality of the ring network cabinet.

[0015] 2. The present invention guides the insulating gas stored in the heat dissipation cylinder of the joint gas storage in the ring network cabinet group back into the insulating chamber of the primary circuit through the No. 2 connecting pipe after the temperature of the insulating chamber of the primary circuit is restored. After the balance spring is reset, the sliding plate is subjected to the pressure of the pressure sensor under the combined action of the balance spring and the gas pressure, and further detects whether the sealing failure occurs during the heating process to cause the loss of insulating gas, and the guided back low-temperature insulating gas can further cool the insulating gas in the insulating chamber of the primary circuit. At the same time, when the pressure relief groove is connected with the distribution groove, the sliding plate moves back and forth due to the fluctuation of the air pressure during pressure relief and the combined action of the balance spring, which drives the corresponding permanent magnet to move back and forth, so that an induced current of a size matching the reciprocating speed is generated in the induction coil, and the fault in the insulating chamber of the primary circuit is further judged, thereby improving the reliability of the use of the ring network cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the heat dissipation tube of the present invention; Figure 3 It is a schematic cross-sectional view of the structure of the heat dissipation tube of the present invention; Figure 4 For the present invention Figure 3 A magnified view of the structure at A; Figure 5 For the present invention Figure 3 A magnified view of the structure at B in FIG. Figure 6 This is a schematic diagram of the interconnected structure of the heat dissipation tubes of the present invention; Figure 7 It is a structural schematic diagram of the sliding plate of the present invention; Figure 8 It is a schematic diagram of the structure of the top ring of the present invention.

[0017] In the figure: 1. cabinet; 2. pressure relief chamber; 3. heat sink; 4. sliding plate; 5. pressure relief groove; 6. No. 1 annular plate; 7. No. 1 spring; 8. pressure relief pipe; 9. No. 1 solenoid valve; 10. monitor; 11. bellows; 12. spring seat; 13. balance spring; 14. top ring; 15. No. 2 annular plate; 16. No. 2 spring; 17. No. 1 connecting pipe; 18. No. 1 one-way valve; 19. distribution chamber; 20. limit ring; 21. No. 2 connecting pipe; 22. No. 2 one-way valve; 23. No. 2 solenoid valve; 24. pressure sensor; 25. permanent magnet; 26. induction coil; 27. current sensor; 28. primary circuit insulation chamber. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0019] See also Figure 1-Figure 5 , Figure 7 and Figure 8 A kind of environmentally friendly gas insulated ring network cabinet comprises a cabinet body 1, which comprises a cable room, a mechanism room, a low-voltage room and a primary circuit insulation room 28. The primary circuit insulation room 28 is filled with environmentally friendly gas as an insulating gas. A pressure relief chamber 2 is arranged at the bottom of the cabinet body 1. A heat dissipation tube 3 is fixedly arranged at the bottom of the pressure relief chamber 2. A sliding plate 4 is movably arranged in the heat dissipation tube 3. The bottom cavity of the heat dissipation tube 3 is communicated with the outside air. A pressure relief groove 5 is opened on the top of the sliding plate 4. The pressure relief groove 5 is used to guide the gas in the primary circuit insulation room 28. A first annular plate 6 for closing the pressure relief groove 5 is slidably sleeved on the outside of the sliding plate 4. Bumps are fixedly arranged on both sides of the first annular plate 6 near the top. The bumps are used to limit the sliding range of the first annular plate 6. The first annular plate 6 cooperates with the bumps to slide in the axial direction relative to the sliding plate 4 without separating from the sliding plate 4.

[0020] When the No. 1 annular plate 6 slides to the top of the sliding plate 4, the No. 1 annular plate 6 is offset from the bottom opening of the pressure relief groove 5 to open the pressure relief groove 5. The pressure relief groove 5 can be connected to the outside of the sliding plate 4 through the channel removed by the No. 1 annular plate 6. The top of the No. 1 annular plate 6 is fixedly connected with a No. 1 spring 7, and the No. 1 spring 7 is used to push the No. 1 annular plate 6 to slide toward the bottom of the sliding plate 4, so that the No. 1 annular plate 6 closes the pressure relief groove 5. The top of the heat dissipation tube 3 is fixedly connected with a pressure relief pipe 8, and the pipe body of the pressure relief pipe 8 is fixedly provided with a No. 1 solenoid valve 9. The primary circuit of the cabinet 1 is insulated. A monitor 10 is fixedly installed in the chamber 28. The monitor 10 is used to detect the pressure state of the gas in the primary circuit insulation chamber 28. The monitor 10 can be set as a temperature sensor. The monitor 10 can also be set as an air pressure sensor. When the monitor 10 detects that the air pressure in the primary circuit insulation chamber 28 is about to reach a threshold value that causes the box body of the primary circuit insulation chamber 28 to deform, the No. 1 solenoid valve 9 is controlled to open, one end of the pressure relief pipe 8 is connected to the primary circuit insulation chamber 28, and the gas in the primary circuit insulation chamber 28 enters through the pressure relief pipe 8 to push the sliding plate 4 to move.

[0021] Specifically, the sliding plate 4 is slidably sleeved with the heat dissipation tube 3, the top of the sliding plate 4 is fixedly connected with a telescopic bag 11, the top of the telescopic bag 11 is fixedly connected with the inner wall of the heat dissipation tube 3, the top of the telescopic bag 11 is communicated with the pressure relief pipe 8, the bottom of the pressure relief pipe 8 is communicated with the pressure relief groove 5, the environmental protection gas enters the pressure relief pipe 8 and enters the pressure relief groove 5 through the telescopic bag 11, the bottom of the heat dissipation tube 3 is fixedly connected with a spring seat 12, the top of the spring seat 12 is fixedly connected with a balance spring 13, one end of the balance spring 13 is fixedly connected with the sliding plate 4, the balance spring 13 is used to push the sliding plate 4 to move toward the top relative to the heat dissipation tube 3, and when the environmental protection gas When the gas pressure increases due to heat expansion, thereby pushing the sliding plate 4 to move toward the bottom of the heat dissipation tube 3, the balance spring 13 provides elastic force in the opposite direction, so that the environmentally friendly gas always maintains a certain gas pressure to ensure a certain insulation capacity. The bottom of the heat dissipation tube 3 is fixedly connected with a top ring 14, and the shape of the top ring 14 is adapted to the shape of the No. 1 annular plate 6, and the position of the top ring 14 corresponds to the position of the No. 1 annular plate 6. The inner side of the top ring 14 is slidably sleeved with a No. 2 annular plate 15, and the inner side of the No. 2 annular plate 15 is fixedly connected with a protrusion. The No. 2 annular plate 15 cooperates with the corresponding protrusion to slide axially relative to the top ring 14 without separating from the top ring 14.

[0022] The bottom of the No. 2 annular plate 15 is fixedly connected with a No. 2 spring 16, and the bottom of the No. 2 spring 16 is fixedly connected to the spring seat 12. The bottom of the outer side of the heat dissipation tube 3 is fixedly provided with a No. 1 connecting pipe 17. An annular distribution chamber 19 is provided inside the top ring 14. One end opening of the distribution chamber 19 is adapted to the inner side surface of the top ring 14. The No. 2 annular plate 15 is used to close the opening of the distribution chamber 19 at one end of the top ring 14. One end of the distribution chamber 19 is connected to the No. 1 connecting pipe 17. When abnormal temperature rise occurs in the primary circuit insulation chamber 28 due to other than arcing fault, the sliding plate 4 is high-voltage. The environmentally friendly gas pushes the sliding plate 4 down, and when the temperature returns to normal, the balance spring 13 rebounds and drives the sliding plate 4 to slide back to its original position. The sliding plate 4 cooperates with the telescopic bag 11 to form a temporary gas storage cavity. When the temperature in the primary circuit insulation chamber 28 rises abnormally but the pressure of the environmentally friendly gas cannot rise to the bursting pressure, the expanded environmentally friendly gas is stored, and a certain pressure is ensured for the environmentally friendly gas in the primary circuit insulation chamber 28. After the temperature is restored, the environmentally friendly gas is returned to the primary circuit insulation chamber 28, ensuring that the environmentally friendly gas will not be lost while avoiding partial deformation of the cabinet 1.

[0023] When an arc fault occurs in the primary circuit insulation chamber 28, the environmental gas expands and pushes the sliding plate 4 to slide to the bottom of the heat dissipation tube 3, the top ring 14 contacts the No. 1 annular plate 6 and pushes the No. 1 annular plate 6 to slide toward the top of the sliding plate 4, the No. 1 spring 7 contracts, and at the same time, the bottom of the sliding plate 4 contacts the No. 2 annular plate 15 and pushes the No. 2 annular plate 15 to slide toward the bottom of the top ring 14, so that the top ring 14 is gradually embedded in the sliding plate 4. At this time, the inner wall of the sliding plate 4 and the No. 2 annular plate 15 cooperate to close the opening of the distribution chamber 19, and the top ring 14 is 4 and the No. 1 annular plate 6 together seal the pressure relief groove 5, the pressure relief groove 5 is connected to the distribution chamber 19, and the No. 1 one-way valve 18 is fixedly provided on the body of the No. 1 connecting pipe 17. The expanded environmental gas continues to pass through the pressure relief groove 5 and the distribution chamber 19 and is discharged from one end of the No. 1 connecting pipe 17 in a one-way manner, thereby completing the pressure relief of the environmental gas in the primary circuit insulation chamber 28 during an arcing fault. The pressure relief is performed before the temperature in the primary circuit insulation chamber 28 rises abnormally to a level that causes deformation, thereby avoiding structural deformation and sealing failure caused by partial deformation of the cabinet body 1 due to gas expansion. Embodiment 2

[0024] See also Figure 2 and Figure 3 , which is different from the telescopic bag 11 in the first embodiment, a sliding sealing mechanism is fixedly arranged on the outer side of the sliding plate 4, and the sliding sealing mechanism is used to seal the gap between the sliding plate 4 and the heat dissipation tube 3 without affecting the sliding of the sliding plate 4, so that the sliding plate 4 divides the heat dissipation tube 3 into an upper and lower cavity. The upper cavity is used to store the expanded environmentally friendly gas, and the lower cavity is connected to the outside air. When the gas in the primary circuit insulating chamber 28 expands, it enters the upper cavity and pushes the sliding plate 4 to slide to the bottom of the heat dissipation tube 3. Embodiment 3

[0025] See also Figure 1-Figure 3 , Figure 5 , Figure 6 and Figure 8 On the basis of the second embodiment, the cabinets 1 of several ring network cabinets are combined to form a ring network cabinet group. The number of cabinets 1 in the ring network cabinet group is at least two. The two adjacent cabinets 1 in the ring network cabinet group are connected to the corresponding two heat dissipation cylinders 3 through a No. 1 connecting pipe 17. Specifically, one end of the No. 1 connecting pipe 17 is connected to the cavity for storing environmental protection gas at the top of the heat dissipation cylinder 3 in the adjacent cabinet 1. When an arc fault occurs in one of the cabinets 1 in the ring network cabinet group, the sliding plate 4 slides to the bottom, and the expanded environmental protection gas enters the top cavity of the heat dissipation cylinder 3 in the adjacent cabinet 1 through the No. 1 connecting pipe 17, pushing the corresponding sliding plate 4 to slide to form a cavity to temporarily store the environmental protection gas. Through the cooperation of the cabinets 1 in the several ring network cabinet groups, the expanded environmental protection gas formed by the cabinet 1 with an arc fault is closed and depressurized and the discharged environmental protection gas is stored to avoid accidental injury to personnel caused by the spraying of high-temperature environmental protection gas, and to avoid waste caused by leakage of environmental protection gas.

[0026] A No. 2 connecting pipe 21 for the reflux of environmental protection gas is fixedly connected to the top of the heat dissipation tube 3. One end of the No. 2 connecting pipe 21 is fixedly connected to the heat dissipation tube 3 in another cabinet 1 in the ring network cabinet group. The No. 2 connecting pipe 21 guides the environmental protection gas flowing into the heat dissipation tube 3 in the adjacent cabinet 1 back to the primary circuit insulation chamber 28. A No. 2 one-way valve 22 is fixedly provided at one end of the tube body of the No. 2 connecting pipe 21. The No. 2 one-way valve 22 can allow the environmental protection gas in the heat dissipation tube 3 in the adjacent cabinet 1 to reflux in one direction to the pressure relief pipe 8 corresponding to the No. 2 one-way valve 22. A No. 2 solenoid valve 23 is fixedly provided at the other end of the No. 2 connecting pipe 21. The No. 2 solenoid valve 23 is located at one end of the No. 2 connecting pipe 21 close to the adjacent cabinet 1. When the cabinet 1 is depressurized, the No. 2 solenoid valve 23 corresponding to the adjacent cabinet 1 is in a closed state to prevent the environmental protection gas in the primary circuit insulation chamber 28 from being directly depressurized through the No. 2 connecting pipe 21 corresponding to the adjacent cabinet 1.

[0027] When the environmental gas flows back, the corresponding No. 2 solenoid valve 23 on the No. 2 connecting pipe 21 is opened, and the heat dissipation tube 3 dissipates heat for the environmental gas passing through. The cooled gas returns to the primary circuit insulation chamber 28 through the corresponding No. 2 connecting pipe 21 and the sliding plate 4, and further promotes the cooling of the environmental gas in the primary circuit insulation chamber 28, thereby improving the safety of the ring network cabinet. In addition, the closed pressure relief gas storage cavity formed by the two connected heat dissipation tubes 3 increases the space for temporary gas storage when the temperature in the primary circuit insulation chamber 28 rises abnormally but the environmental gas is lower than the blasting pressure, thereby further improving the temporary storage of environmental gas to avoid partial explosion of the cabinet 1. Deformation effect, the top of the heat dissipation tube 3 is fixedly connected to the limit ring 20, and the bottom of the limit ring 20 is fixedly provided with a pressure sensor 24 for detecting the pressure of the reset state of the sliding plate 4. After the sliding plate 4 is reset, the pressure of the sliding plate 4 on the limit ring 20 is detected, and the temperature sensor is used to judge the air pressure in the primary circuit insulation chamber 28 and the resultant force of the balance spring 13 on the sliding plate 4 at this time. When the sealing of the primary circuit insulation chamber 28 fails, the pressure value detected by the pressure sensor 24 increases, thereby detecting the air tightness of the primary circuit insulation chamber 28 after the temperature of the primary circuit insulation chamber 28 rises and causes the environmental protection gas to expand. Embodiment 4

[0028] On the basis of the third embodiment, a permanent magnet 25 is fixedly arranged in the middle of the sliding plate 4, an induction coil 26 is arranged at the bottom of the outer side of the heat dissipation tube 3, and a current sensor 27 is fixedly arranged on one side of the induction coil 26. When the sliding plate 4 slides to the bottom of the heat dissipation tube 3, the distribution chamber 19 cooperates with the No. 1 connecting pipe 17 to relieve pressure. When abnormal temperature rise occurs in the primary circuit insulation chamber 28, when the temperature reaches the threshold set by the temperature sensor and the heating speed is slow, the sliding plate 4 will maintain dynamic balance due to the pressure relief and the elastic force of the balance spring 13, and the sliding plate 4 will be within a certain range. The reciprocating movement up and down drives the permanent magnet 25 to reciprocate, thereby generating an induced current in the induction coil 26. The current sensor 27 detects the current size. When the temperature in the primary circuit insulation chamber 28 rises faster, the pressure is reduced after the air pressure passes through the sliding plate 4, causing the sliding plate 4 to be relieved by the balance spring 13, and the air pressure rises to push the balance spring 13 to release pressure alternately. The larger the current size generated in the induction coil 26, the rate of temperature rise is detected, and then the cause of the temperature rise is determined, such as whether the rapid temperature rise is caused by an arcing fault. .

[0029] The method of use (working principle) of the present invention is as follows: When the temperature in the primary circuit insulation chamber 28 rises to the rated threshold of the temperature sensor, the corresponding solenoid valve No. 1 is opened, and the environmental protection gas expands due to heat, driving the sliding plate 4 to move until the pressure relief groove 5 and the distribution chamber 19 are connected to the heat dissipation tube 3 in the adjacent cabinet 1, and closed pressure relief is performed before the temperature rises to cause the cabinet 1 to deform. It can adapt to the situation where the temperature rises due to arcing faults and the environmental protection gas pressure reaches the bursting pressure, as well as other situations where the environmental protection gas pressure does not reach the bursting pressure but reaches the deformation pressure of the cabinet 1, and at the same time, heat exchange is carried out using the heat dissipation tube 3.

[0030] When the pressure is released through the sliding plate 4, it moves back and forth due to the combined force of the changing air pressure at the top and the elastic force of the balance spring 13, driving the permanent magnet 25 to move so that the induction coil 26 has a corresponding current. The current sensor 27 detects the current size to determine the heating rate, and the fault status of the circuit components in the cabinet 1 is determined according to the heating rate. After the temperature of the primary circuit insulation chamber 28 is restored, the balance spring 13 in the cabinet 1 that participates in the pressure relief pushes the corresponding sliding plate 4 to reset, and the No. 2 solenoid valve 23 corresponding to the No. 2 connecting pipe 21 is opened. The environmentally friendly gas in the adjacent cabinet 1 flows back to the primary circuit insulation chamber 28 through the No. 2 one-way valve 22. According to the pressure detected by the corresponding pressure sensor 24 after the sliding plate 4 is reset, it is determined whether the sealing of the primary circuit insulation chamber 28 has failed, and the returned environmentally friendly gas further cools the environmentally friendly gas in the primary circuit insulation chamber 28.

Claims

1. An environmentally friendly gas-insulated ring main unit, comprising a cabinet body (1), wherein the cabinet body (1) comprises a pressure relief chamber (2) and a primary circuit insulation chamber (28), wherein the primary circuit insulation chamber (28) is filled with a gas insulation medium, and wherein: A heat dissipation tube (3) is fixedly arranged at the bottom of the pressure relief chamber (2), a pressure relief pipe (8) is fixedly connected to the top of the heat dissipation tube (3), a first solenoid valve (9) is fixedly arranged on the body of the pressure relief pipe (8), and an air storage mechanism is arranged in the heat dissipation tube (3); A monitor (10) is fixedly arranged in the primary circuit insulation chamber (28) of the cabinet (1), and the monitor (10) is used to detect the gas state in the primary circuit insulation chamber (28). The gas storage mechanism can passively move under the action of gas pressure to cooperate with the heat dissipation tube (3) to form a gas storage cavity and give the gas a certain pressure. The gas storage mechanism can cooperate with the gas storage mechanism in other cabinets (1) outside the corresponding cabinet (1) to communicate with each other to form a joint pressure relief when the gas storage cavity of the gas storage mechanism reaches the maximum.

2. The environmentally friendly gas insulated ring main unit according to claim 1, characterized in that: The gas storage mechanism comprises a sliding plate (4), a pressure relief groove (5) is provided on the top of the sliding plate (4), a first annular plate (6) for closing the pressure relief groove (5) is slidably sleeved on the outside of the sliding plate (4), a first spring (7) is fixedly connected to the top of the first annular plate (6), a telescopic bag (11) is fixedly connected to the top of the sliding plate (4), a spring seat (12) is fixedly connected to the bottom of the heat dissipation tube (3), a balance spring (13) is fixedly connected to the top of the spring seat (12), and the balance spring (13) is used to push the sliding plate (4) to move toward the top relative to the heat dissipation tube (3).

3. The environmentally friendly gas insulated ring main unit according to claim 2, characterized in that: A top ring (14) is fixedly connected to the bottom of the heat dissipation tube (3); the shape of the top ring (14) matches the shape of the first annular plate (6); the position of the top ring (14) corresponds to the position of the first annular plate (6); a second annular plate (15) is slidably sleeved on the inner side of the top ring (14); a second spring (16) is fixedly connected to the bottom of the second annular plate (15); a distribution chamber (19) is provided inside the top ring (14); the second annular plate (15) is used to close an opening at one end of the distribution chamber (19).

4. The environmentally friendly gas insulated ring main unit according to claim 3, characterized in that: The first annular plate (6) has protrusions fixedly disposed on both sides near the top thereof for limiting the sliding range of the first annular plate (6), the inner side of the second annular plate (15) is fixedly connected with a protrusion for limiting the sliding range of the second annular plate (15), and the sliding plate (4) is slidably sleeved with the heat dissipation cylinder (3).

5. The environmentally friendly gas insulated ring main unit according to claim 3, characterized in that: A sliding sealing mechanism for sealing the gap between the sliding plate (4) and the heat dissipation cylinder (3) is fixedly provided on the outer side of the sliding plate (4).

6. The environmentally friendly gas insulated ring main unit according to claim 1, characterized in that: The plurality of cabinets (1) are combined to form a ring network cabinet group, wherein the number of cabinets (1) in the ring network cabinet group is at least two, a No. 1 connecting pipe (17) is fixedly provided at the bottom of the outer side of the heat dissipation cylinder (3), one end of the No. 1 connecting pipe (17) is connected to the top of the heat dissipation cylinder (3) in the adjacent cabinet (1), and a No. 1 one-way valve (18) is fixedly provided on the pipe body of the No. 1 connecting pipe (17).

7. The environmentally friendly gas insulated ring main unit according to claim 1, characterized in that: A No. 2 connecting pipe (21) for environmentally friendly gas reflux is fixedly connected to the top of the heat dissipation tube (3); one end of the No. 2 connecting pipe (21) is fixedly connected to the heat dissipation tube (3) in another cabinet (1) in the ring network cabinet group; a No. 2 one-way valve (22) is fixedly provided on one end of the No. 2 connecting pipe (21); and a No. 2 solenoid valve (23) is fixedly provided on the other end of the No. 2 connecting pipe (21).

8. The environmentally friendly gas insulated ring main unit according to claim 1, characterized in that: The top of the heat dissipation cylinder (3) is fixedly connected to a limit ring (20), and the bottom of the limit ring (20) is fixedly provided with a pressure sensor (24) for detecting the pressure of the reset state of the sliding plate (4).

9. The environmentally friendly gas insulated ring main unit according to claim 2, characterized in that: A permanent magnet (25) is fixedly arranged in the middle of the sliding plate (4), an induction coil (26) is arranged at the bottom of the outer side of the heat dissipation cylinder (3), and a current sensor (27) is fixedly arranged on one side of the induction coil (26).

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