Electric insulation protection device for ring main unit

Abstract

The utility model relates to the technical field of ring main units, in particular to an electrical insulation protection device for a ring main unit, which not only performs double insulation protection and nitrogen and ceramic insulation protection on the ring main unit, but also treats dust and moisture in the ring main unit, thereby prolonging the service life of electrical and cable in the ring main unit. Comprising a cabinet body mechanism; the base mechanism is installed on the ground and isolates electrical conduction between the cabinet body mechanism and the ground, and the sealing mechanism is installed on the base mechanism and isolates nitrogen exchange between the outside and the inside of the cabinet body mechanism; the inflation mechanism is installed on the cabinet body mechanism and fills nitrogen into the cabinet body mechanism to achieve insulation, the air exhaust mechanism is installed on the cabinet body mechanism and exhausts the nitrogen in the cabinet body mechanism, and the filtering mechanism is installed on the cabinet body mechanism and filters and purifies the nitrogen exhausted by the air exhaust mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of ring network cabinets, and in particular to an electrical insulation protection device of ring network cabinets. Background Art

[0002] A ring main unit is a group of electrical equipment installed in a metal or non-metallic insulating cabinet or made into an assembled interval ring main unit. Its core part uses load switches and fuses. It has the advantages of simple structure, small size, low price, improved power supply parameters and performance, and power supply safety. It is widely used in distribution stations and box-type substations in load centers such as urban residential areas, high-rise buildings, large public buildings, factories and enterprises.

[0003] An existing ring main unit protection device, for example, a ring main unit with a protection device disclosed in the utility model patent with application number 201920101948.4, has a main structure including a ring main unit body, an inner cavity of the ring main unit body is provided with a ring main unit gas cabinet, a connecting pipe is provided through the bottom of the ring main unit gas cabinet, a fixing ring is provided at the bottom of the ring main unit gas cabinet, a sealing ring is provided in the inner cavity of the fixing ring, an air hole is opened at the bottom of the fixing ring, and a connecting frame is provided at the bottom of the fixing ring; when in use, the insulating gas in the ring main unit gas cabinet passes through the connecting pipe and enters the inner cavity of the pressure relief pipe from the connecting frame. When the pressure of the insulating gas in the ring main unit gas cabinet is not high, the elastic diaphragm and the second pressure relief hole are in a tightly fitted state. Once the pressure of the insulating gas is too high, the elastic diaphragm undergoes elastic deformation, and the insulating gas passes through the second pressure relief hole and the first pressure relief hole and is discharged from the exhaust pipe, thereby quickly balancing the pressure in the inner cavity of the ring main unit gas cabinet.

[0004] However, most of the existing ring network cabinets rely solely on nitrogen insulation, which has a poor insulation effect. Moreover, after long-term use, dust and moisture are easily accumulated in the ring network cabinet and cannot be discharged, which affects the service life of the cable. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an electrical insulation protection device for a ring main unit, which not only performs double insulation protection on the ring main unit, utilizing nitrogen insulation and ceramic insulation protection, but also processes the dust and moisture in the ring main unit, thereby extending the service life of electrical appliances and cables in the unit.

[0006] The utility model discloses an electrical insulation protection device for a ring network cabinet, comprising a cabinet mechanism; further comprising a base mechanism, a sealing mechanism, an air charging mechanism, an air extraction mechanism and a filtering mechanism, wherein the base mechanism is installed on the ground and isolates the electrical conduction between the cabinet mechanism and the ground, the sealing mechanism is installed on the base mechanism and isolates the nitrogen exchange between the outside and the cabinet mechanism, the air charging mechanism is installed on the cabinet mechanism and fills nitrogen into the cabinet mechanism to achieve insulation, the air extraction mechanism is installed on the cabinet mechanism and extracts the nitrogen in the cabinet mechanism, the filtering mechanism is installed on the cabinet mechanism and filters and purifies the nitrogen extracted by the air extraction mechanism; the current transmission between the cabinet mechanism and the base mechanism is isolated by setting the base mechanism to prevent arc overflow, the nitrogen overflow is prevented by setting the sealing mechanism, the air charging mechanism is started to fill nitrogen into the cabinet mechanism to isolate the arc, and the air extraction mechanism extracts the nitrogen in the cabinet mechanism, and the dust and moisture in the nitrogen extracted by the air extraction mechanism are absorbed by the filtering mechanism to recycle the nitrogen.

[0007] Preferably, the base mechanism includes a base, six groups of springs and two groups of ceramic pads. The base is installed on the ground. Two groups of grooves are opened on the base. The six groups of springs are all installed on the base, and the six groups of springs are respectively located in the grooves on the left and right sides of the base. The bottom end of the ceramic pad is connected to the top end of the three groups of springs located on the same side, and the two groups of ceramic pads are respectively installed in the grooves on the left and right sides of the base. By arranging the springs, hard contact between the cabinet mechanism and the base is prevented to damage the ceramic pad, and the vibration between the cabinet mechanism and the ceramic pad is reduced. Since the ceramic pad is an insulator and is not conductive, it is ensured that the current in the ring network cabinet will not be transmitted to the ground to achieve safe electrical isolation.

[0008] Preferably, the cabinet mechanism includes a base plate, a ring network cabinet, a current detector and a grounding wire, the bottom end of the base plate is placed on the top end of the ceramic pad, the bottom end of the ring network cabinet is connected to the top end of the base plate, a cavity is provided inside the ring network cabinet, and the front opening of the ring network cabinet is connected to the cavity of the ring network cabinet, the current detector is installed on the outer wall of the ring network cabinet, and the grounding wire is installed on the current detector; electrical equipment such as cables and switches are installed in the cavity of the ring network cabinet, and the base plate is provided to facilitate the placement of the ring network cabinet on the base mechanism, the grounding wire conducts away the static electricity generated in the ring network cabinet, and at the same time the current detector detects the current passing through the grounding wire. When the current is too large, it indicates that the ring network cabinet has a leakage, and an alarm is issued to remind relevant personnel to handle it.

[0009] Preferably, the sealing mechanism includes a hinge, a sealing door, a handle, a door lock and a warning light. The hinge is installed at the front opening of the ring network cabinet body, the sealing door is installed on the hinge, the handle is installed on the outer wall of the sealing door, the door lock is installed on the outer wall of the sealing door, and the warning light is installed on the outer wall of the sealing door and is connected to the current detector through an electrical signal; the staff controls the sealing door to rotate by the handle to close the sealing door, and the sealing door is installed at the opening of the ring network cabinet body to prevent nitrogen in the ring network cabinet body from overflowing. The sealing door is locked by the door lock to prevent unauthorized personnel from opening it at will and causing accidents. When the current detector detects that the current is too large, the current detector triggers the warning light through an electrical signal to sound an alarm, reminding relevant personnel to come and deal with it.

[0010] Preferably, the charging mechanism includes a gas tank, a gas pipe 1, a valve 1, a pressure gauge, a gas pipe 2 and a valve 2. The gas tank is installed on the outer side wall of the ring network cabinet body and an inner cavity is provided inside the gas tank. The gas pipe 1 is installed on the gas tank and communicated with the inner cavity of the gas tank. The valve 1 is installed on the gas pipe 1. The pressure gauge is installed on the gas tank and communicated with the inner cavity of the gas tank. The gas pipe 2 is installed on the gas tank and communicated with the inner cavity of the gas tank and the cavity of the ring network cabinet body. The valve 2 is installed on the gas pipe 2. Open the valve 1, the gas pipe 1 transports nitrogen from the outside to the gas tank, open the valve 2, the nitrogen enters the cavity of the ring network cabinet body through the gas pipe 2, isolates the relevant electrical equipment, prevents the arc from overflowing, observes the nitrogen in the inner cavity of the gas tank through the pressure gauge, and adjusts the switches of the valve 1 and the gas pipe 2 in time to prevent the gas pressure in the gas tank from being too high.

[0011] Preferably, the exhaust mechanism includes an exhaust fan, an air collecting hopper, an air supply pipe three, an air pump and an air supply pipe four. An exhaust port is opened at the top of the cavity inside the ring network cabinet body. The exhaust fan is installed at the top exhaust port of the ring network cabinet body. The air collecting hopper is installed at the outer top of the ring network cabinet body and is connected with the exhaust port of the ring network cabinet body. The air supply pipe three is installed on the air collecting hopper and is connected with the air collecting hopper. The bottom end of the air pump is connected to the top of the ring network cabinet body. The air supply pipe four is installed on the air pump. Start the exhaust fan, and the nitrogen in the cavity of the ring network cabinet body is sucked into the air collecting hopper through the exhaust fan. Then start the air pump. The air pump extracts the nitrogen in the air collecting hopper through the air supply pipe three, and then transports the nitrogen into the filtering mechanism through the air supply pipe four for filtration and purification. By arranging the exhaust fan and the air pump, the flow of nitrogen is accelerated and the circulation rate of nitrogen is improved.

[0012] Preferably, the filtering mechanism includes a filter box, two groups of filter plates, two groups of pull rings, an exhaust pipe, an exhaust valve, a reflux pipe and valve three. The filter box is installed on the outer side wall of the ring network cabinet body, and a filter cavity is arranged inside the filter box. The two groups of filter plates are respectively slidably installed in the filter cavity of the filter box, and the two groups of pull rings are respectively installed on the two groups of filter plates and are located outside the filter cavity of the filter box. The exhaust pipe is installed on the outer side wall of the filter box and is connected with the inside of the filter cavity of the filter box. The exhaust valve is installed on the exhaust pipe, and the reflux pipe is connected with the inside of the exhaust pipe and the inner cavity of the gas storage tank. Valve three is installed on the reflux pipe; gas transmission pipe four transports nitrogen to the filter cavity of the filter box, and the nitrogen passes through the two groups of filter plates in the filter cavity of the filter box to filter out dust and moisture in the nitrogen, and then flows back to the gas storage tank through the exhaust pipe and valve three. When the pressure in the gas storage tank is too high, valve three is closed and the exhaust valve is opened, and the nitrogen is discharged through the exhaust pipe.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the current transmission between the cabinet mechanism and the base mechanism is isolated by setting a base mechanism to prevent arc overflow; nitrogen overflow is prevented by setting a sealing mechanism; the charging mechanism is started to charge nitrogen into the cabinet mechanism to isolate the arc; at the same time, the exhaust mechanism extracts the nitrogen in the cabinet mechanism, and the dust and moisture in the nitrogen extracted by the exhaust mechanism are absorbed by the filtering mechanism, so that the nitrogen is recovered and reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of the partially enlarged section axial structure of the base mechanism and the cabinet mechanism of the utility model;

[0016] Figure 3 It is a schematic diagram of the partially enlarged left-view structure of the cabinet mechanism of the present invention;

[0017] Figure 4 It is a structural diagram of the cabinet mechanism and sealing mechanism of the utility model;

[0018] Figure 5 It is a schematic diagram of the partially enlarged section axial structure of the inflatable mechanism, the air extraction mechanism and the filter mechanism of the utility model;

[0019] Figure 6 It is a schematic diagram of the partially amplified axial structure of the inflatable mechanism and the filter mechanism of the utility model.

[0020] Markings in the attached drawings: 01, base mechanism; 11, base; 12, spring; 13, ceramic pad; 02, cabinet mechanism; 21, bottom plate; 22, ring network cabinet; 23, current detector; 24, grounding wire; 03, sealing mechanism; 31, hinge; 32, sealed door; 33, handle; 34, door lock; 35, warning light; 04, charging mechanism; 41, gas storage tank; 42, gas pipe one; 43, valve one; 44, pressure gauge; 45, gas pipe two; 46, valve two; 05, exhaust mechanism; 51, exhaust fan; 52, gas collecting hopper; 53, gas pipe three; 54, air pump; 55, gas pipe four; 06, filtering mechanism; 61, filter box; 62, filter plate; 63, pull ring; 64, exhaust pipe; 65, exhaust valve; 66, reflux pipe; 67, valve three. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0022] Example 1

[0023] The utility model discloses an electrical insulation protection device for a ring network cabinet, comprising a cabinet body 02; a base body 01, a sealing body 03, an air charging body 04, an air extraction body 05 and a filtering body 06, wherein the base body 01 is installed on the ground and isolates the electrical conduction between the cabinet body 02 and the ground, the sealing body 03 is installed on the base body 01 and isolates the nitrogen exchange between the outside and the cabinet body 02, the air charging body 04 is installed on the cabinet body 02 and charges nitrogen into the cabinet body 02, the air extraction body 05 is installed on the cabinet body 02 and extracts the nitrogen in the cabinet body 02, and the filtering body 06 is installed on the cabinet body 02 and filters and purifies the nitrogen extracted by the air extraction body 05;

[0024] The base mechanism 01 includes a base 11, six groups of springs 12 and two groups of ceramic pads 13. The base 11 is installed on the ground. Two groups of grooves are opened on the base 11. The six groups of springs 12 are installed on the base 11, and the six groups of springs 12 are respectively located in the grooves on the left and right sides of the base 11. The bottom end of the ceramic pad 13 is connected to the top end of the three groups of springs 12 located on the same side. The two groups of ceramic pads 13 are respectively installed in the grooves on the left and right sides of the base 11.

[0025] The cabinet mechanism 02 includes a bottom plate 21, a ring main cabinet 22, a current detector 23 and a grounding wire 24. The bottom end of the bottom plate 21 is placed on the top end of the ceramic pad 13. The bottom end of the ring main cabinet 22 is connected to the top end of the bottom plate 21. A cavity is provided inside the ring main cabinet 22. The front opening of the ring main cabinet 22 is connected to the cavity of the ring main cabinet 22. The current detector 23 is installed on the outer side wall of the ring main cabinet 22. The grounding wire 24 is installed on the current detector 23.

[0026] The sealing mechanism 03 includes a hinge 31, a sealing door 32, a handle 33, a door lock 34 and a warning light 35. The hinge 31 is installed at the front opening of the ring main cabinet 22, the sealing door 32 is installed on the hinge 31, the handle 33 is installed on the outer side wall of the sealing door 32, the door lock 34 is installed on the outer side wall of the sealing door 32, and the warning light 35 is installed on the outer side wall of the sealing door 32 and is connected to the current detector 23 through an electrical signal.

[0027] The charging mechanism 04 includes a gas tank 41, a gas pipe 1 42, a valve 1 43, a pressure gauge 44, a gas pipe 2 45 and a valve 2 46. The gas tank 41 is installed on the outer wall of the ring network cabinet body 22 and the gas tank 41 is provided with an inner cavity. The gas pipe 1 42 is installed on the gas tank 41 and communicates with the inner cavity of the gas tank 41. The valve 1 43 is installed on the gas pipe 1 42. The pressure gauge 44 is installed on the gas tank 41 and communicates with the inner cavity of the gas tank 41. The gas pipe 2 45 is installed on the gas tank 41 and the gas pipe 2 45 is communicated with the inner cavity of the gas tank 41 and the cavity of the ring network cabinet body 22. The valve 2 46 is installed on the gas pipe 2 45.

[0028] When it is working, first, electrical equipment such as cables and switches are installed in the cavity of the ring main cabinet body 22. The bottom plate 21 is provided to facilitate the placement of the ring main cabinet body 22 on the ceramic pad 13. The spring 12 is provided to prevent the cabinet body mechanism 02 and the base 11 from hard contact to damage the ceramic pad 13, and to reduce the vibration between the cabinet body mechanism 02 and the ceramic pad 13. Since the ceramic pad 13 is an insulator and is non-conductive, it isolates the flow of current in the ring main cabinet. The staff controls the sealing door 32 to rotate through the handle 33 to close the sealing door 32. The sealing door 32 cover is installed at the opening of the ring main cabinet body 22 to prevent the nitrogen in the ring main cabinet body 22 from overflowing. The sealing door 32 is locked through the door lock 34 to prevent irrelevant personnel from opening it at will. In case of an accident, the grounding wire 24 conducts away the static electricity generated in the ring main unit 22, and the current detector 23 detects the current passing through the grounding wire 24. When the current detector 23 detects that the current is too large, the current detector 23 triggers the warning light 35 through an electrical signal to sound an alarm, reminding relevant personnel to come and deal with it. At the same time, valve 1 43 is opened, and the gas pipe 1 42 transports the external nitrogen to the gas tank 41. Valve 2 46 is opened, and the nitrogen enters the cavity of the ring main unit 22 through the gas pipe 2 45 to isolate related electrical equipment and prevent arc overflow. The nitrogen pressure in the inner cavity of the gas tank 41 is observed through the pressure gauge 44, and the switches of valve 1 43 and gas pipe 2 45 are adjusted in time to prevent the gas pressure in the gas tank 41 from being too high.

[0029] Example 2

[0030] like Figures 1 to 6 As shown, an electrical insulation protection device for a ring network cabinet of the utility model is based on Example 1; it also includes an exhaust mechanism 05, the exhaust mechanism 05 includes an exhaust fan 51, an air collecting hopper 52, a gas pipe three 53, an air pump 54 and a gas pipe four 55, an exhaust port is opened at the top of the cavity inside the ring network cabinet body 22, the exhaust fan 51 is installed at the top exhaust port of the ring network cabinet body 22, the air collecting hopper 52 is installed at the external top of the ring network cabinet body 22 and is connected to the exhaust port of the ring network cabinet body 22, the gas pipe three 53 is installed on the air collecting hopper 52 and is connected to the air collecting hopper 52, the bottom end of the air pump 54 is connected to the top of the ring network cabinet body 22, and the gas pipe four 55 is installed on the air pump 54;

[0031] The filter mechanism 06 includes a filter box 61, two groups of filter plates 62, two groups of pull rings 63, an exhaust pipe 64, an exhaust valve 65, a return pipe 66 and a valve three 67. The filter box 61 is installed on the outer side wall of the ring network cabinet body 22. A filter cavity is arranged inside the filter box 61. The two groups of filter plates 62 are respectively slidably installed in the filter cavity of the filter box 61. The two groups of pull rings 63 are respectively installed on the two groups of filter plates 62 and are located outside the filter cavity of the filter box 61. The exhaust pipe 64 is installed on the outer side wall of the filter box 61 and is connected to the inside of the filter cavity of the filter box 61. The exhaust valve 65 is installed on the exhaust pipe 64. The return pipe 66 is connected to the inside of the exhaust pipe 64 and to the inner cavity of the gas storage tank 41. The valve three 67 is installed on the return pipe 66.

[0032] When it is working, firstly, the cables, switches and other electrical equipment are installed in the cavity of the ring main unit cabinet 22. By setting the bottom plate 21, the ring main unit cabinet 22 is conveniently placed on the ceramic pad 13. By setting the spring 12, the cabinet mechanism 02 and the base 11 are prevented from hard contact to damage the ceramic pad 13, and the vibration between the cabinet mechanism 02 and the ceramic pad 13 is reduced. Since the ceramic pad 13 is an insulator and does not conduct electricity, it isolates the flow of current in the ring main unit. The staff controls the rotation of the sealing door 32 through the handle 33 , close the sealing door 32, and install the sealing door 32 cover at the opening of the ring main cabinet body 22 to prevent the nitrogen in the ring main cabinet body 22 from escaping. Lock the sealing door 32 through the door lock 34 to prevent unauthorized personnel from opening it at will and causing accidents. The grounding wire 24 conducts the static electricity generated in the ring main cabinet body 22. At the same time, the current detector 23 detects the current passing through the grounding wire 24. When the current detector 23 detects that the current is too large, the current detector 23 triggers the warning light 35 through an electrical signal to sound an alarm, reminding relevant personnel Personnel come to handle it, and at the same time open valve 1 43, gas pipe 1 42 transports external nitrogen to gas tank 41, open valve 2 46, nitrogen enters the cavity of ring main cabinet body 22 through gas pipe 2 45 to isolate related electrical equipment and prevent arc overflow, observe the nitrogen pressure in the inner cavity of gas tank 41 through pressure gauge 44, adjust the switch of valve 1 43 and gas pipe 2 45 in time to prevent the gas pressure in gas tank 41 from being too high, start exhaust fan 51, and the nitrogen in the cavity of ring main cabinet body 22 is exhausted by exhaust fan 51. The fan 51 sucks the nitrogen into the air collecting hopper 52, and then starts the air pump 54. The air pump 54 extracts the nitrogen in the air collecting hopper 52 through the air pipe three 53, and then the air pipe four 55 transports the nitrogen to the filter cavity of the filter box 61. The nitrogen passes through two groups of filter plates 62 in the filter cavity of the filter box 61 to filter out dust and moisture in the nitrogen, and then flows back to the gas storage tank 41 through the exhaust pipe 64 and the valve three 67. When the pressure in the gas storage tank 41 is too high, the valve three 67 is closed and the exhaust valve 65 is opened, and the nitrogen is discharged through the exhaust pipe 64.

[0033] The exhaust fan 51 and the air pump 54 of the utility model are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manuals, without the need for technicians in the field to make creative efforts.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An electrical insulation protection device for a ring main unit, comprising a cabinet body mechanism (02); characterized in that: The cabinet also comprises a base mechanism (01), a sealing mechanism (03), an air charging mechanism (04), an air extraction mechanism (05) and a filtering mechanism (06). The base mechanism (01) is installed on the ground and isolates the electrical conduction between the cabinet mechanism (02) and the ground. The sealing mechanism (03) is installed on the base mechanism (01) and isolates the nitrogen exchange between the outside and the cabinet mechanism (02). The air charging mechanism (04) is installed on the cabinet mechanism (02) and fills nitrogen into the cabinet mechanism (02) to achieve insulation. The air extraction mechanism (05) is installed on the cabinet mechanism (02) and extracts the nitrogen in the cabinet mechanism (02). The filtering mechanism (06) is installed on the cabinet mechanism (02) and filters and purifies the nitrogen extracted by the air extraction mechanism (05).

2. The electrical insulation protection device for a ring main unit according to claim 1, characterized in that: The base mechanism (01) comprises a base (11), six groups of springs (12) and two groups of ceramic pads (13). The base (11) is installed on the ground. Two groups of grooves are opened on the base (11). The six groups of springs (12) are installed on the base (11), and the six groups of springs (12) are respectively located in the grooves on the left and right sides of the base (11). The bottom end of the ceramic pad (13) is connected to the top end of the three groups of springs (12) located on the same side. The two groups of ceramic pads (13) are respectively installed in the grooves on the left and right sides of the base (11).

3. The electrical insulation protection device for a ring main unit according to claim 2, characterized in that: The cabinet structure (02) comprises a base plate (21), a ring network cabinet (22), a current detector (23) and a grounding wire (24); the bottom end of the base plate (21) is placed on the top end of a ceramic pad (13); the bottom end of the ring network cabinet (22) is connected to the top end of the base plate (21); a cavity is provided inside the ring network cabinet (22); and a front opening of the ring network cabinet (22) is connected to the cavity of the ring network cabinet (22); the current detector (23) is installed on the outer wall of the ring network cabinet (22); and the grounding wire (24) is installed on the current detector (23).

4. The electrical insulation protection device for a ring main unit as claimed in claim 3, characterized in that: The sealing mechanism (03) comprises a hinge (31), a sealing door (32), a handle (33), a door lock (34) and a warning light (35), wherein the hinge (31) is mounted at the front opening of the ring network cabinet body (22), the sealing door (32) is mounted on the hinge (31), the handle (33) is mounted on the outer side wall of the sealing door (32), the door lock (34) is mounted on the outer side wall of the sealing door (32), and the warning light (35) is mounted on the outer side wall of the sealing door (32) and is connected to the current detector (23) through an electrical signal.

5. The electrical insulation protection device for a ring main unit as claimed in claim 3, characterized in that: The gas charging mechanism (04) comprises a gas storage tank (41), a gas transmission pipe 1 (42), a valve 1 (43), a pressure gauge (44), a gas transmission pipe 2 (45) and a valve 2 (46); the gas storage tank (41) is mounted on the outer wall of the ring network cabinet body (22) and an inner cavity is arranged inside the gas storage tank (41); the gas transmission pipe 1 (42) is mounted on the gas storage tank (41) and communicates with the inner cavity of the gas storage tank (41); the valve 1 (43) is mounted on the gas transmission pipe 1 (42); the pressure gauge (44) is mounted on the gas storage tank (41) and communicates with the inner cavity of the gas storage tank (41); the gas transmission pipe 2 (45) is mounted on the gas storage tank (41) and communicates with the inner cavity of the gas storage tank (41) and the cavity of the ring network cabinet body (22); and the valve 2 (46) is mounted on the gas transmission pipe 2 (45).

6. The electrical insulation protection device for a ring main unit according to claim 3, characterized in that: The air extraction mechanism (05) comprises an exhaust fan (51), an air collecting hopper (52), an air supply pipe three (53), an air pump (54) and an air supply pipe four (55); an exhaust port is provided at the top of the cavity of the ring network cabinet body (22); the exhaust fan (51) is installed at the top exhaust port of the ring network cabinet body (22); the air collecting hopper (52) is installed at the top of the outside of the ring network cabinet body (22) and is connected to the exhaust port of the ring network cabinet body (22); the air supply pipe three (53) is installed on the air collecting hopper (52) and is connected to the air collecting hopper (52); the bottom end of the air pump (54) is connected to the top of the ring network cabinet body (22); and the air supply pipe four (55) is installed on the air pump (54).

7. The electrical insulation protection device for a ring main unit according to claim 5, characterized in that: The filter mechanism (06) comprises a filter box (61), two groups of filter plates (62), two groups of pull rings (63), an exhaust pipe (64), an exhaust valve (65), a return pipe (66) and a third valve (67). The filter box (61) is mounted on the outer wall of the ring network cabinet body (22). A filter cavity is arranged inside the filter box (61). The two groups of filter plates (62) are respectively slidably mounted in the filter cavity of the filter box (61). The two groups of pull rings (63) are respectively mounted on the two groups of filter plates (62) and are located outside the filter cavity of the filter box (61). The exhaust pipe (64) is mounted on the outer wall of the filter box (61) and is connected to the inside of the filter cavity of the filter box (61). The exhaust valve (65) is mounted on the exhaust pipe (64). The return pipe (66) is connected to the inside of the exhaust pipe (64) and is connected to the inside of the inner cavity of the gas storage tank (41). The third valve (67) is mounted on the return pipe (66).

Images