SF6 ring net cabinet gas leakage mark and air supplement system

Abstract

The present application relates to a kind of SF6 ring network cabinet gas leakage mark and air supply system, the gas tank of SF6 ring network cabinet is by top plate, bottom plate, two transverse side plates and two longitudinal side plates spliced together and is formed, and the weld of transverse side plate and longitudinal side plate is equipped with mark device respectively, and mark device includes the L-shaped support plate made of transparent material, the transverse plate and longitudinal plate of L-shaped support plate are fixed on the transverse side plate and longitudinal side plate of gas tank respectively by gasket, the inside of the transverse plate of L-shaped support plate is fixed with the mark plate made of transparent material and facing weld, the longitudinal plate of L-shaped support plate is fixed with the horizontal rod that is spaced up and down and between weld and mark plate, and fixed sleeve is equipped on horizontal rod, the lower side of fixed sleeve is connected with diaphragm, and the side of diaphragm facing mark plate is coated with solid pigment, and air supply device is equipped on transverse side plate, when gas tank leaks, air supply device can automatically fill SF6 into gas tank. It has the advantages of simple structure, low cost, safe and reliable, strong practicality.

Description

Technical Field

[0001] This invention relates to a ring main unit, specifically to a leak marking and gas replenishment system for SF6 ring main units. Background Technology

[0002] SF6 gas-insulated ring main units are medium-voltage electrical combination devices that can be freely combined into multiple circuits, providing switching, interconnection, and protection functions for power systems. Their main circuit core components consist of SF6 load switches, circuit breakers, and other auxiliary electrical appliances. The gas box (cabinet) of the SF6 ring main unit is a sealed cavity structure formed by welding plates, filled with pressurized SF6 insulating gas. With prolonged use or in high-altitude areas, gas leakage from the weld seams often occurs in the gas box of the SF6 ring main unit. In such cases, it is necessary to replenish the gas inside the ring main unit's gas box to ensure its insulation performance and safety reliability. For example, the utility model patent with announcement number CN216959097U, entitled "High-Voltage Intelligent SF6 Ring Main Unit," includes a cabinet containing a gas chamber, an operating chamber, a pressure relief chamber, and a cable chamber. The top of the gas chamber is connected to a first electromagnetic control valve via an input pipe. A first connecting pipe is located on one side of the first electromagnetic control valve. One side of the first connecting pipe is detachably connected to a second connecting pipe via a first connector and a second connector. A first boss is welded to one side of the first connector, and a second boss is welded to one side of the second connector. A limiting device matching the first and second bosses is provided at the connection point between the first and second connectors. A pressure sensor is installed on the inner wall of the gas chamber, and a pressure relief device is located at the bottom of the gas chamber. A controller is also installed inside the gas chamber. While this existing patent technology can automatically replenish and vent gas based on the internal gas pressure of the ring main unit's gas box, it cannot mark leak points, making it difficult for personnel to quickly locate leaks and perform timely repairs. Summary of the Invention

[0003] The purpose of this invention is to provide an SF6 ring main unit leakage marking and replenishment system, which has the advantages of simple structure, low cost, safety and reliability, and strong practicality.

[0004] To address the aforementioned problems in the existing technology, this invention provides an SF6 ring main unit leakage marking and replenishment system. The SF6 ring main unit's gas box is constructed by welding together a top plate, a bottom plate, two transverse side plates, and two longitudinal side plates. Marking devices are provided at the weld seams of the transverse and longitudinal side plates. Each marking device includes an L-shaped support plate made of transparent material. The transverse and longitudinal plates of the L-shaped support plate are respectively fixed to the transverse and longitudinal side plates of the gas box via pads. A marking plate made of transparent material facing the weld seam is fixed to the inner side of the transverse plate of the L-shaped support plate. A horizontal bar with vertical spacing between the weld seam and the marking plate is fixed to the longitudinal plate of the L-shaped support plate. A fixing sleeve is provided on the horizontal bar, and a thin film is connected to the lower side of the fixing sleeve. The side of the thin film facing the marking plate is coated with solid pigment. A replenishment device is provided on the transverse side plate. When the gas box leaks, the replenishment device can automatically replenish SF6 into the gas box.

[0005] Furthermore, the present invention provides an SF6 ring main unit leakage marking and replenishment system, wherein the replenishment device includes an SF6 storage tank, a solenoid valve, and a replenishment pipe. The SF6 storage tank is fixed to the outside of the transverse side plate, and the outlet of the SF6 storage tank is provided with a first pipe joint. The solenoid valve is sealed and fixed to the outside of the transverse side plate, and the inlet of the solenoid valve is provided with a second pipe joint. The outlet of the solenoid valve is connected to the inner cavity of the gas box through a replenishment hole provided on the transverse side plate. The two ends of the replenishment pipe are connected to the first pipe joint and the second pipe joint respectively.

[0006] Furthermore, the present invention provides an SF6 ring main unit leakage marking and replenishment system, wherein the replenishment device further includes a controller fixed on the outside of the transverse side plate, and a pressure sensor sealed and fixed on the transverse side plate and extending into the inner cavity of the gas box. The controller is connected to the solenoid valve and the pressure sensor respectively through a first wire and a second wire.

[0007] Furthermore, the present invention provides an SF6 ring main unit leakage marking and replenishment system, wherein a support plate is fixed to the outer side of the transverse side plate, a positioning cylinder is fixed to the support plate, the SF6 storage tank is clamped in the positioning cylinder, and the second pipe joint passes through the support plate.

[0008] Furthermore, the present invention provides an SF6 ring main unit leakage marking and replenishment system, wherein the controller is fixed on a support plate on one side of the positioning cylinder, and the support plate is provided with a wire hole at the position corresponding to the controller, through which the first wire and the second wire pass.

[0009] Furthermore, the present invention provides an SF6 ring main unit leakage marking and replenishment system, wherein the support plate is welded to the transverse side plate and the positioning cylinder is welded to the support plate.

[0010] Furthermore, the present invention provides an SF6 ring main unit leakage marking and replenishment system, wherein the pad is provided with spaced threaded holes, and the horizontal and vertical plates of the L-shaped bracket plate are provided with connection holes corresponding to the threaded holes. The horizontal and vertical plates are fixed to the corresponding pad by bolts installed in the connection holes and threaded holes.

[0011] Furthermore, the present invention provides an SF6 ring main unit leakage marking and replenishment system, wherein the two ends of the marking plate are respectively fixed to the horizontal plate of the L-shaped bracket plate by screws, one end of the crossbar is welded to the horizontal plate of the L-shaped bracket plate, and the other end of the crossbar is suspended.

[0012] Furthermore, the present invention provides an SF6 ring main unit leakage marking and replenishment system, wherein the pad is fixed to the gas box by welding.

[0013] Compared with existing technologies, the SF6 ring main unit leakage marking and gas replenishment system of this invention has the following advantages: The gas box of the SF6 ring main unit is composed of a top plate, a bottom plate, two transverse side plates, and two longitudinal side plates welded together. This invention sets marking devices at the weld seams of the transverse and longitudinal side plates, and sets L-shaped support plates made of transparent material for the marking devices. The transverse and longitudinal plates of the L-shaped support plate are fixed to the transverse and longitudinal side plates of the gas box respectively by pads. A marking plate made of transparent material facing the weld seam is fixed on the inner side of the transverse plate of the L-shaped support plate. A horizontal bar with vertical spacing between the weld seam and the marking plate is fixed on the longitudinal plate of the L-shaped support plate. A fixing sleeve is set on the horizontal bar, and a thin film is connected to the lower side of the fixing sleeve. A solid pigment is coated on the side of the thin film facing the marking plate. A gas replenishment device is set on the transverse side plate. When the gas box leaks, the gas replenishment device automatically fills the gas box with SF6. This results in a simple, low-cost, safe, reliable, and highly practical SF6 ring main unit leak marking and gas replenishment system. In practical applications, when a leak occurs at a point in the weld, the leaking gas will blow a diaphragm sheet, causing its lower end to drift towards the marking plate. When the diaphragm sheet contacts the marking plate, it will apply solid pigment to the marking plate. Maintenance personnel can then determine the location of the leak by observing the solid pigment on the marking plate, thus achieving the purpose of leak marking. When the pressure in the gas tank decreases due to a leak, the gas replenishment device can fill the gas tank with SF6, maintaining the pressure within a safe range and ensuring the insulation effect and reliability of the SF6 ring main unit. This invention, by incorporating a transparent L-shaped support plate and marking plate into the marking device, allows maintenance personnel to visually inspect the internal condition of the device, enabling them to accurately pinpoint the leak location based on the solid pigment coating on the marking plate. The addition of padding enhances structural strength and creates a distance between the L-shaped support plate and the gas box side plate, facilitating the installation of the marking plate, crossbar, fixing sleeve, and diaphragm. Furthermore, the inclusion of a gas replenishment device ensures automatic SF6 refilling when the gas box leaks, guaranteeing safety.

[0014] The following detailed description of the SF6 ring main unit leakage marking and replenishment system of the present invention, with reference to the accompanying drawings, provides further specific details. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an SF6 ring main unit leakage marking and replenishment system according to the present invention;

[0016] Figure 2 for Figure 1 A magnified view of a portion of position A in the middle;

[0017] Figure 3 This is a schematic diagram of the internal structure of an SF6 ring main unit leakage marking and replenishment system according to the present invention;

[0018] Figure 4 This is a partial cross-sectional schematic diagram of an SF6 ring main unit leakage marking and replenishment system according to the present invention;

[0019] Figure 5 for Figure 4 A magnified view of a portion of position B in the middle;

[0020] Figure 6 This is a schematic diagram of the structure of the pad block in this invention;

[0021] Figure 7 This is a schematic diagram of the marking device in the present invention;

[0022] Figure 8 for Figure 7 A magnified view of the area at position C. Detailed Implementation

[0023] First, it should be noted that the directional terms such as up, down, left, right, front, and back used in this invention are merely descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this invention.

[0024] like Figures 1 to 8The present invention illustrates a specific embodiment of an SF6 ring main unit leakage marking and replenishment system. The air box 1 of the SF6 ring main unit is specifically constructed by welding together a top plate 11, a bottom plate 12, two transverse side plates 13, and two longitudinal side plates 14. Marking devices 2 are respectively installed at the weld seams of the transverse side plates 13 and the longitudinal side plates 14. The marking devices 2 are mounted on an L-shaped support plate 21 made of transparent material. The transverse plates 211 and longitudinal plates 212 of the L-shaped support plate 21 are respectively fixed to the transverse side plates 13 and the longitudinal side plates 14 of the air box 1 using pads 22. A marking plate 23 made of transparent material, facing the weld seam, is fixed inside the transverse plate 211 of the L-shaped support plate 21. A horizontal bar 24, spaced vertically between the weld seam and the marking plate 23, is fixed on the longitudinal plate 212 of the L-shaped support plate 21. A fixing sleeve 25 is installed on the horizontal bar 24, with a thin film 26 connected to the lower side of the fixing sleeve 25. A solid pigment is coated on the side of the thin film 26 facing the marking plate 23. Meanwhile, an air replenishment device 3 is installed on the transverse side plate 13. When the air box 1 leaks, the air replenishment device 3 automatically fills the air box 1 with SF6.

[0025] The above setup constitutes a simple, low-cost, safe, reliable, and highly practical SF6 ring main unit leak marking and gas replenishment system. In practical applications, when a leak occurs at a point in the weld, the leaking gas will blow the diaphragm 26 so that its lower end floats towards the marking plate 23. When the diaphragm 26 contacts the marking plate 23, it will apply solid pigment to the marking plate 23. Maintenance personnel can then determine the location of the leak by observing the solid pigment on the marking plate 23, thus achieving the purpose of leak marking. When the pressure in the gas tank 1 decreases due to leakage, the gas replenishment device 3 fills the gas tank with SF6, which can maintain the pressure in the gas tank 1 within a safe range, ensuring the insulation effect and reliability of the SF6 ring main unit. This invention, by incorporating a transparent L-shaped support plate 21 and a marking plate 23 into the marking device 2, allows maintenance personnel to visually inspect the internal condition of the marking device 2, enabling accurate identification of leak locations based on the solid pigment coating on the marking plate 23. The inclusion of a pad 22 enhances structural strength and creates a distance between the L-shaped support plate 21 and the side plate of the gas box 1, facilitating the installation of the marking plate 23, crossbar 24, fixing sleeve 25, and diaphragm sheet 26. The inclusion of a gas replenishment device 3 achieves the technical objective of automatically refilling the gas box 1 with SF6 when it leaks, ensuring safety. It should be noted that the SF6 ring main unit is existing equipment in the field, and its structure and principles are well-known to those skilled in the art. The transparent material can be made of various forms such as plexiglass, and the diaphragm sheet can be made of various materials such as plastic and rubber; as long as it possesses sufficient flexibility and can move with the wind, the technical objectives of this invention can be achieved.

[0026] As an optimized solution, this specific embodiment includes an SF6 storage tank 31, a solenoid valve 32, and a gas supply pipe 33 in the gas supply device 3. The SF6 storage tank 31 is fixed to the outside of the transverse side plate 13, and its outlet has a first pipe connector 311. The solenoid valve 32 is sealed and fixed to the outside of the transverse side plate 13, and its inlet has a second pipe connector 321. The outlet of the solenoid valve 32 communicates with the inner cavity of the gas box 1 through a gas supply hole 131 on the transverse side plate 13. The two ends of the gas supply pipe 33 are connected to the first pipe connector 311 and the second pipe connector 321 respectively. This configuration of the gas supply device 3 features a simple structure, low cost, and convenient control. When the pressure in gas tank 1 drops below a first set value due to leakage, SF6 from SF6 storage tank 31 can be introduced into gas tank 1 by opening solenoid valve 32. When the pressure in gas tank 1 rises to a second set value, SF6 introduction into gas tank 1 is stopped by closing solenoid valve 32. This maintains the pressure in gas tank 1 within a certain range, ensuring the insulation effect and safety reliability of the SF6 ring main unit. To achieve automatic gas replenishment in case of leakage, this specific embodiment also includes a controller 34 fixed to the outside of the transverse side plate 13 and a pressure sensor 35 sealed and fixed to the transverse side plate 13 and extending into the inner cavity of gas tank 1. The controller 34 is connected to the solenoid valve 32 and the pressure sensor 35 respectively via a first wire 36 and a second wire 37. This setup allows the pressure sensor 35 to detect the pressure in gas tank 1 in real time and transmit the pressure detection parameters to the controller 34, enabling the controller 34 to automatically control the opening and closing of the solenoid valve 32 based on the pressure detection parameters. This improves the timeliness and effectiveness of introducing SF6 into gas tank 1 in case of leakage, enhancing safety reliability.

[0027] In a specific embodiment, a support plate 132 is fixed to the outside of the transverse side plate 13, and a positioning cylinder 133 is fixed on the support plate 132. The SF6 storage tank 31 is fitted into the positioning cylinder 133, and the second pipe connector 321 passes through the support plate 132. This arrangement improves the convenience of disassembling and assembling the SF6 storage tank 31, allowing for quick replacement when the SF6 in the SF6 storage tank 31 is depleted. Simultaneously, in this specific embodiment, the controller 34 is fixed to the support plate 132 on one side of the positioning cylinder 133, and a wire-passing hole is provided at the position corresponding to the controller 34 on the support plate 132 to facilitate the passage of the first wire 36 and the second wire 37 through the wire-passing hole. To simplify the structure and improve stability, the present invention typically welds the support plate 132 to the transverse side plate 13 and the positioning cylinder 133 to the support plate 132.

[0028] In a specific embodiment, to improve ease of assembly and disassembly, the present invention provides spaced threaded holes 221 on the pad 22. Correspondingly, connecting holes 213 corresponding to the threaded holes 221 are provided on the transverse plate 211 and longitudinal plate 212 of the L-shaped support plate 21, allowing the transverse plate 211 and longitudinal plate 212 to be fixed to the corresponding pad 22 by bolts 27 installed in the connecting holes 213 and threaded holes 221. Similarly, in this specific embodiment, both ends of the marking plate 23 are fixed to the transverse plate 211 of the L-shaped support plate 21 by screws 28 to improve ease of assembly and disassembly; and one end of the crossbar 24 is welded to the transverse plate 211 of the L-shaped support plate 21 to improve stability, while the other end of the crossbar 24 is suspended to facilitate the installation of the fixing sleeve 25. In practical applications, the present invention also fixes the pad 22 to the air box 1 by welding to improve stability.

[0029] Practical application has shown that the SF6 ring main unit leakage marking and refueling system provided by this invention can produce the following beneficial effects: 1. By setting up a diaphragm and a marking plate, when SF6 leakage occurs at the weld, the diaphragm will be blown from the leakage point, causing it to float outward around the fixed sleeve, thus marking the leakage point on the marking plate with pigment, making it easier for personnel to locate the leakage point and carry out timely repairs. 2. By setting up a pressure sensor, the SF6 pressure inside the SF6 ring main unit can be detected in real time. When leakage occurs in the ring main unit, the pressure sensor will transmit the pressure to the controller, which will open the solenoid valve, allowing the SF6 inside the SF6 tank to be replenished into the ring main unit through the refueling pipe in a timely manner. This ensures that the SF6 in the ring main unit is maintained within a reliable pressure range, thus allowing the ring main unit to maintain its insulation effect by automatically replenishing SF6 after a leakage.

[0030] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications made by those skilled in the art based on the technical solutions of the present invention without departing from the design concept of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A leakage marking and replenishment system for an SF6 ring main unit, wherein the air box (1) of the SF6 ring main unit is constructed by welding together a top plate (11), a bottom plate (12), two transverse side plates (13), and two longitudinal side plates (14), characterized in that, Marking devices (2) are provided at the weld seams of the transverse side plate (13) and the longitudinal side plate (14), respectively. The marking device (2) includes an L-shaped support plate (21) made of transparent material. The transverse plate (211) and the longitudinal plate (212) of the L-shaped support plate (21) are respectively fixed to the transverse side plate (13) and the longitudinal side plate (14) of the air box (1) by pads (22). A marking plate made of transparent material facing the weld seam is fixed on the inner side of the transverse plate (211) of the L-shaped support plate (21). 23) A horizontal bar (24) is fixed on the longitudinal plate (212) of the L-shaped support plate (21) and is located between the weld and the marking plate (23). A fixing sleeve (25) is provided on the horizontal bar (24). A thin film (26) is connected to the lower side of the fixing sleeve (25). The side of the thin film (26) facing the marking plate (23) is coated with solid pigment. A gas replenishing device (3) is provided on the transverse side plate (13). When the gas box (1) leaks, the gas replenishing device (3) can automatically fill the gas box (1) with SF6.

2. The SF6 ring main unit leakage marking and replenishment system according to claim 1, characterized in that, The gas replenishment device (3) includes an SF6 storage tank (31), a solenoid valve (32), and a gas replenishment pipe (33). The SF6 storage tank (31) is fixed on the outside of the transverse side plate (13). The outlet of the SF6 storage tank (31) is provided with a first pipe joint (311). The solenoid valve (32) is sealed and fixed on the outside of the transverse side plate (13). The inlet of the solenoid valve (32) is provided with a second pipe joint (321). The outlet of the solenoid valve (32) is connected to the inner cavity of the gas box (1) through the gas replenishment hole (131) provided on the transverse side plate (13). The two ends of the gas replenishment pipe (33) are connected to the first pipe joint (311) and the second pipe joint (321) respectively.

3. The SF6 ring main unit leakage marking and replenishment system according to claim 2, characterized in that, The air replenishment device (3) also includes a controller (34) fixed on the outside of the transverse side plate (13) and a pressure sensor (35) sealed and fixed on the transverse side plate (13) and extending into the inner cavity of the air box (1). The controller (34) is connected to the solenoid valve (32) and the pressure sensor (35) respectively through the first wire (36) and the second wire (37).

4. The SF6 ring main unit leakage marking and replenishment system according to claim 3, characterized in that, A support plate (132) is fixed to the outside of the transverse side plate (13), and a positioning cylinder (133) is fixed on the support plate (132). The SF6 storage tank (31) is fitted in the positioning cylinder (133), and the second pipe joint (321) passes through the support plate (132).

5. The SF6 ring main unit leakage marking and replenishment system according to claim 4, characterized in that, The controller (34) is fixed on a support plate (132) on one side of the positioning cylinder (133). The support plate (132) is provided with a wire hole at the position corresponding to the controller (34). The first wire (36) and the second wire (37) pass through the wire hole.

6. The SF6 ring main unit leakage marking and replenishment system according to claim 5, characterized in that, The support plate (132) is welded to the transverse side plate (13), and the positioning cylinder (133) is welded to the support plate (132).

7. The SF6 ring main unit leakage marking and replenishment system according to claim 1, characterized in that, The pad (22) is provided with spaced threaded holes (221), and the horizontal plate (211) and vertical plate (212) of the L-shaped bracket plate (21) are provided with connecting holes (213) corresponding to the threaded holes (221). The horizontal plate (211) and vertical plate (212) are fixed to the corresponding pad (22) by bolts (27) installed in the connecting holes (213) and threaded holes (221).

8. The SF6 ring main unit leakage marking and replenishment system according to claim 7, characterized in that, The two ends of the marking plate (23) are fixed to the horizontal plate (211) of the L-shaped bracket plate (21) by screws (28), and one end of the crossbar (24) is welded to the horizontal plate (211) of the L-shaped bracket plate (21), while the other end of the crossbar (24) is suspended.

9. The SF6 ring main unit leakage marking and replenishment system according to claim 7, characterized in that, The pad (22) is fixed to the air box (1) by welding.

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