A high-voltage direct-current (HVDC) GIL built-in pot-type insulator and embedded particle trap structure

Abstract

The application discloses a high-voltage direct-current GIL built-in basin-type insulator and embedded particle trap structure, which comprises two opposite GIL metal housings, metal flanges one and two are respectively welded and fixed at opposite ends of the two GIL metal housings, a built-in basin-type insulator is sealingly and fixedly arranged in the GIL metal housing, a center conductive rod is fixedly arranged at a center position of the built-in basin-type insulator, and annular embedded particle trap capturing assemblies are symmetrically arranged at two sides of the built-in basin-type insulator; a pressing block is arranged at an edge of the built-in basin-type insulator; a sealing structure is arranged on a butt joint surface of the metal flanges one and two, and a pouring material port of the built-in basin-type insulator is bendingly sealed in the sealing structure of the two flanges. The application belongs to the technical field of high-voltage direct-current transmission insulation equipment, and particularly relates to a high-voltage direct-current GIL built-in basin-type insulator and embedded particle trap structure which has good electric field optimization effect, high particle capturing efficiency and can be disassembled and cleaned.

Description

Technical Field

[0001] This invention belongs to the technical field of high voltage direct current transmission insulation equipment, specifically referring to a high voltage direct current GIL built-in basin insulator and embedded particle trap structure. Background Technology

[0002] High-voltage direct current (HVDC) gas-insulated line (GIL) possesses advantages such as large transmission capacity, excellent insulation performance, strong environmental adaptability, and small footprint, and is widely used in ultra-high-voltage direct current long-distance transmission, cross-sea transmission, and urban underground pipeline transmission projects. The basin-type insulator is the core insulation component of the GIL, undertaking the crucial functions of separating the gas chamber, supporting the central conductive rod, and providing sealing insulation. Existing traditional structures have several technical defects:

[0003] 1. Under a DC electric field, space charge easily accumulates on the surface of the insulator, causing electric field distortion, uneven distribution of electric field along the surface, and excessively high local field strength, which can easily induce flashover along the surface and significantly shorten the service life of the insulator.

[0004] 2. During the processing, assembly, and long-term operation of the GIL cylinder, a large number of free metal particles will be generated. Under the DC electric field, the starting voltage of the metal particles is low and their movement is active. When the particles collide with the insulator, they will scratch the insulation surface and distort the local electric field. In severe cases, they will directly cause insulation breakdown.

[0005] 3. Traditional external flange ring insulators have multiple sealing channels and no reliable sealing protection at the insulator casting port, allowing moisture and impurities to easily enter from the casting port and damage the insulation performance;

[0006] 4. Conventional particle traps are only placed at the bottom of the cylinder and use a single groove structure. Particles trapped at flanges and insulator corners cannot be captured. Once captured, the metal particles are easy to escape again under the action of electric field and vibration, resulting in poor protection effect.

[0007] 5. Traditional particulate traps are fixed by welding. During assembly, the trap needs to be pushed into the welding from the far end of the cylinder, which can easily scratch the inner wall of the cylinder and the trap, and introduce additional metal particles. After welding, the inside of the trap forms a closed space, and impurities and metal particles cannot be cleaned regularly, which poses a major insulation hazard in long-term operation.

[0008] In summary, the existing technology lacks an integrated basin-type insulator particle trap structure that is suitable for high-voltage DC operating conditions, has good electric field optimization effect, high particle capture efficiency, is detachable and cleanable, and prevents secondary particle escape, which restricts the long-term stable operation of high-voltage DC GIL. Summary of the Invention

[0009] To address the various shortcomings of existing traditional GIL basin insulators and particle traps, this invention provides a high-voltage DC GIL with a built-in basin insulator and an embedded particle trap structure. This solves technical problems such as large charge accumulation, electric field distortion, limited capture range of metal particles, secondary escape of particles, high risk of sealing leakage, inability to inspect and clean traps, and floating partial discharge of the ground shield ring. It achieves uniform and optimized electric field, captures metal particles across the entire range, completely suppresses particle escape, reduces the probability of sealing leakage, eliminates floating potential, improves the overall insulation strength of the insulator, and extends the service life of GIL equipment.

[0010] The technical solution adopted by the present invention is as follows: The present invention proposes a high voltage DC GIL built-in basin insulator and embedded particle trap structure, including two opposite GIL metal shells, and metal flange one and metal flange two are respectively welded and fixed at opposite ends of the two GIL metal shells, and metal flange one and metal flange two are fixed by bolt connection.

[0011] As an improvement to this solution, the GIL metal housing is sealed and fixed with an internal basin-type insulator, and the internal basin-type insulator is located between metal flange one and metal flange two. A central conductive rod is fixed through the center of the internal basin-type insulator, and annular embedded particle trap capture components are symmetrically installed on both sides of the internal basin-type insulator.

[0012] The built-in basin insulator is provided with a pressure block at its edge, and is fixed to the metal flange one by the pressure block, and the pressure block is located between the metal flange one and the metal flange two.

[0013] The mating surfaces of the first and second metal flanges are equipped with a sealing structure, which reduces one sealing structure compared to traditional insulators with flange rings, thus reducing the risk of air leakage. At the same time, the refractory inlet of the built-in pot insulator is bent and sealed within the sealing structure of the two flanges, further improving the overall sealing performance of the GIL.

[0014] Furthermore, the built-in basin insulator is cast using epoxy resin doped with alumina filler, and its cross-section is a gently curved surface structure with a radial and tangential angle of less than 23° and a radius of curvature of 250-450mm, which reduces the surface normal electric field component and suppresses charge accumulation. The low-voltage end of the built-in basin insulator is designed with a circular ground shielding ring to balance the electric field.

[0015] Furthermore, the ground shielding ring is an aluminum alloy ring with a diameter of 14mm. In order to prevent stress deformation during the insulator casting process from causing gap defects, the ring-shaped ground shielding ring is provided with a notch. This notch can effectively reduce the stress deformation of the epoxy and metal ground shielding ring during the insulator casting and curing process, and ensure the insulation performance of the insulator. At the same time, six sets of fixing posts are evenly welded on the ground shielding ring for fixing the ground shielding ring during the insulator casting production.

[0016] Furthermore, the built-in basin-type insulator is equipped with three sets of stainless steel equipotential bonding pins to eliminate floating potential and suppress partial discharge. The equipotential bonding pin consists of a top cover, an ejector spring, a fixing pin fixture, and a fixing rod, and all equipotential structural components are made of stainless steel. The fixing rod is threadedly fastened to the fixing post of the ground shielding ring. The top cover is plugged into the upper end of the fixing rod, and an ejector spring is provided between the top cover and the fixing rod. The top cover is pressed to the bottom along the axis of the fixing rod, so that the fixing rod is aligned with the through hole on the side wall of the top cover. The fixing pin fixture is plugged into the through hole between the top cover and the fixing rod.

[0017] Furthermore, the embedded particle trap capturing assembly includes an annular fixing base, bolt fixing countersunk holes, a bottom grid capturing mesh, and an arc-shaped flange shield. The bolt fixing countersunk holes are evenly distributed along the circumference of the annular fixing base, the bottom grid capturing mesh is located at the bottom of the annular fixing base, and the arc-shaped flange shield is symmetrically distributed on the outer walls at both ends of the annular fixing base.

[0018] Furthermore, the annular fixing bases of the two sets of embedded particle trap capturing components are fixed to metal flange one and metal flange two respectively by passing hexagonal socket bolts through bolt fixing countersunk holes.

[0019] Furthermore, the embedded particle trap capturing component is detachably fixed by bolts, and its outer surface is sprayed with an electric field optimized gradient coating. This coating is made of a nonlinear resistivity functionally graded material, with a coating thickness of 0.2~0.5mm and a coating resistivity that gradually increases from near the center of the insulator to the edge.

[0020] Furthermore, the inner side of the annular fixed base is a wedge-shaped gradient escape-proof trap groove, with a high-damping insulating adsorption adhesive layer pasted on its inner side. The trap groove has a wide opening and a narrow bottom, with a side wall angle of 45°. At the same time, it has an internal arc-shaped shielding recess.

[0021] Furthermore, the bottom grid capture net adopts a hollow diamond grid structure with a grid aperture of 5mm and a grid thickness of 3mm. It is arranged in an interlaced maze structure to improve the particle escape prevention performance.

[0022] Furthermore, the pressing block consists of a pressing body and a sealing ring. The pressing body is fixed to the metal flange by bolts, and it has an integrally formed folded edge on the side of the built-in basin insulator. The sealing ring is located between the folded edge and the built-in basin insulator. When the pressing body is tightened under the action of the bolts, the folded edge presses down on the sealing ring and makes it fit tightly against the built-in basin insulator, so that the built-in basin insulator and the metal flange are finally fitted together.

[0023] Furthermore, the GIL metal shell is filled with 0.5-0.6MPa SF6 insulating gas; under the action of electric field force, the particles are intercepted by the annular trap and guided to settle into the wedge-shaped groove. The low electric field environment in the groove, together with the adsorption adhesive layer, locks the particles and prevents secondary escape; the gradient coating of the insulator optimizes the electric field distribution, suppresses charge accumulation, and controls the maximum local field strength within 12kV / mm.

[0024] The beneficial effects achieved by the present invention using the above structure are as follows:

[0025] 1. Outstanding electric field optimization effect: The combination of a smooth arc-shaped insulator surface and a nonlinear resistivity gradient coating adapts to the characteristics of high voltage DC electric field, suppresses charge accumulation on the insulator surface, creates a uniform electric field along the surface, and allows for controllable local field strength, effectively avoiding DC surface flashover faults.

[0026] 2. Full-area particle capture with high capture efficiency: The combination structure of the annular embedded traps on both sides of the insulator and the wedge-shaped groove at the bottom of the cylinder can capture suspended particles, bottom-sedimented particles, and particles trapped at the flange corners at the same time.

[0027] 3. Multiple structures suppress secondary escape of particles: 45° wedge-shaped gradient groove + arc-shaped shielding recess + labyrinth-style diamond grid + high-damping adsorption adhesive layer for multi-layer protection. The low electric field environment inside the groove suppresses the jumping of particles, and the adhesive layer adsorbs micron-sized metal powder, completely solving the problem of particle rebound and escape under DC conditions.

[0028] 4. Significantly improved sealing performance: The insulator has a fully built-in structure, reducing one independent sealing surface. The refractory inlet is sealed inside the flange seal. The pressure block and sealing ring press the insulator tightly, providing multi-layer sealing protection and significantly reducing the risk of air leakage.

[0029] 5. No floating potential, stable insulation: The aluminum alloy ground shielding ring with stress relief notch, combined with three sets of spring-type equipotential bonding pins, not only avoids internal gap defects caused by insulator casting, but also completely eliminates the floating potential of the shielding ring, preventing long-term partial discharge damage to the insulation.

[0030] 6. Easy to install and disassemble, and low maintenance cost: The particle trap is fixed with bolts, eliminating the traditional welding structure. The assembly is free of scratches and welding foreign objects. During maintenance, it can be disassembled and cleaned of metal particles separately. It is compatible with the existing GIL universal installation size and does not require modification of the cylinder.

[0031] 7. Strong adaptability to working conditions and long service life: The passivation treatment of aluminum alloy components eliminates tip discharge, and the epoxy resin insulators are resistant to high voltage and high and low temperatures, and can work stably in extreme environments of -40℃ to 70℃, reducing the frequency of equipment maintenance and lowering the overall operation and maintenance cost of UHVDC transmission projects. Attached Figure Description

[0032] Figure 1This is a schematic diagram of the overall structure of a high-voltage DC GIL built-in basin insulator and embedded particle trap structure proposed in this invention.

[0033] Figure 2 This is a schematic diagram of the fixing structure of the built-in basin insulator component with embedded particle trap structure, which is a high-voltage DC GIL built-in basin insulator proposed in this invention.

[0034] Figure 3 This is a schematic diagram of the embedded particle trapping component of a high-voltage DC GIL built-in basin insulator and embedded particle trap structure proposed in this invention.

[0035] Figure 4 This is a schematic diagram of the structure of a built-in basin insulator component with an embedded particle trap structure, which is a high-voltage DC GIL built-in basin insulator proposed in this invention.

[0036] Figure 5 This is a schematic diagram of the structure of a ground shielding ring component with a built-in basin-type insulator and an embedded particle trap structure for high voltage DC GIL proposed in this invention.

[0037] Figure 6 This is a cross-sectional structural diagram of an equipotential bonding pin component with a built-in basin-type insulator and an embedded particle trap structure proposed in this invention.

[0038] The components include: 1. GIL metal shell; 11. Metal flange one; 12. Metal flange two; 2. Central conductive rod; 3. Built-in basin insulator; 4. Embedded particle trap capture assembly; 41. Bolt fixing countersunk hole; 42. Bottom grid capture net; 43. Arc-shaped flange shield; 44. Annular fixing base; 5. Ground shield ring; 51. Notch; 52. Fixing post; 6. Equipotential bonding pin; 61. Top cover; 62. Ejection spring; 63. Fixing pin tooling; 64. Fixing rod; 7. Pressure block; 71. Crimping body; 72. Sealing fixing ring; 8. Sealing structure.

[0039] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] 1. Overall structural assembly

[0042] like Figure 1 and Figure 2 As shown, the present invention includes a GIL metal housing 1, a central conductive rod 2, an internal basin-type insulator 3, and an embedded particle trap capturing assembly 4. Metal flanges 11 and 12 are welded to the ends of the two oppositely arranged GIL metal housings 1, respectively, and are secured with bolts. The internal basin-type insulator 3 is sealed and installed between the metal flanges 11 and 12, inside the GIL metal housing 1, dividing the housing into left and right independent sealed air chambers. The central conductive rod 2 is coaxially fixed through the center of the internal basin-type insulator 3, and the central conductive rod 2 is used to transmit high-voltage direct current. The embedded particle trap capturing assembly 4 is symmetrically and annularly assembled on both sides of the internal basin-type insulator 3.

[0043] An internal basin-type insulator 3 has a pressure block 7 on its outer edge. The pressure block 7 is located between the mating gap of metal flange 11 and metal flange 22. The internal basin-type insulator 3 is pressed and fixed on metal flange 11 by the pressure block 7. A sealing structure 8 is set on the mating surface of metal flange 11 and metal flange 22. Compared with the traditional insulator with external flange ring, one sealing surface can be reduced, reducing the risk of air leakage. The casting port of the internal basin-type insulator 3 is bent and stored inside the sealing structure 8, further improving the airtightness of the whole machine.

[0044] 2. Example of a basin-type insulator body

[0045] like Figure 4 As shown, the built-in basin-type insulator 3 is cast and cured using high-purity epoxy resin doped with micron-sized alumina filler, exhibiting a mechanical tensile strength ≥95MPa and a breakdown field strength ≥35kV / mm. The insulator cross-section features a gently curving surface structure with a radial and tangential angle of less than 23° and a curvature radius of 250–450mm. This optimizes the space charge flow path under a DC electric field, reduces the normal electric field component on the insulator surface, and prevents localized charge accumulation at its source. Stainless steel inserts are pre-embedded on the outer edge of the insulator, which, together with the pressure block 7, are pressed together to improve overall sealing stability.

[0046] 3. Example of a built-in basin-type insulator ground shielding ring

[0047] like Figure 5As shown, the low-voltage end of the built-in basin-type insulator 3 is equipped with a circular ground shielding ring 5 to balance the electric field distribution along the surface of the insulator. The ground shielding ring 5 is an aluminum alloy ring with a diameter of 14mm and a notch 51 (10mm wide). The notch 51 can release the thermal expansion and contraction stress between the epoxy resin and the metal ground shielding ring 5 during the epoxy casting and curing stage of the insulator, avoid stress deformation and gap defects, and ensure the insulation performance of the insulator. Six sets of fixing posts 52 are uniformly welded around the circumference of the ground shielding ring 5. During the insulator casting process, the fixing posts 52 are used to position and fix the ground shielding ring 5 to prevent the shielding ring from shifting or misaligning during casting.

[0048] 4. Example of a built-in basin-type insulator ground shielding ring top pin structure

[0049] like Figure 6 As shown, three sets of equipotential bonding pins 6 are evenly arranged on the built-in basin-type insulator 3 to achieve equipotential conduction between the ground shielding ring 5 and the GIL metal shell 1, preventing the ground shielding ring 5 from generating a floating potential and causing partial discharge. The equipotential bonding pins 6 are all made of stainless steel and consist of four parts: a top cover 61, an ejector spring 62, a fixing pin fixture 63, and a fixing rod 64, which are rust-proof and corrosion-resistant.

[0050] Assembly process: During the pre-assembly stage of the insulator, the fixing rod 64 is fastened to the fixing post 52 of the ground shielding ring 5 by thread; the ejector spring 62 is fitted onto the upper end of the fixing rod 64, and the top cover 61 is put on; the top cover 61 is pressed down along the axial direction of the fixing rod 64 to the bottom, so that the top cover 61 is aligned with the through hole on the side wall of the fixing rod 64, and the fixing pin fixture 63 is inserted laterally into the through hole of the two to complete the temporary locking. Under the spring compression state, the top cover 61 is limited by the fixing pin fixture 63, which facilitates the overall installation of the insulator into the GIL metal housing 1; after the insulator and flange are assembled in place, the fixing pin fixture 63 is pulled out, and the ejector spring 62 rebounds to push the top cover 61 to fit tightly against the inner wall of the GIL metal housing 1, so as to achieve a reliable equipotential connection.

[0051] 5. Example of a bottom escape-prevention trap trough

[0052] like Figure 3 As shown, the embedded particle trap capturing component 4 includes an annular fixing base 44, bolt fixing countersunk holes 41, a bottom grid capturing mesh 42, and an arc-shaped flange shield 43. The annular fixing base 44 has multiple sets of bolt fixing countersunk holes 41 evenly distributed around its circumference. The two sets of embedded particle trap capturing components 4 are detachably fixed to the inside of metal flange 11 and metal flange 2 12 by passing hexagonal socket head cap screws through the bolt fixing countersunk holes 41. This method abandons the traditional welding fixing method, and the assembly is scratch-free and can be disassembled and cleaned of particles individually.

[0053] The annular fixed base 44 has symmetrically integrally formed arc-shaped flanged shields 43 on both ends of its outer wall; a wedge-shaped gradient escape trap groove is opened on the inner side of the annular fixed base 44, with a wide opening and a narrow bottom, and the inner side wall of the groove has an included angle of 45°, and an arc-shaped shielding recess is added inside the groove; a 0.3mm thick high-damping silicone rubber insulating adsorption layer is pasted on the inner wall of the trap groove, which can adsorb micron-sized metal powder and prevent fine particles from vibrating and scattering.

[0054] The bottom of the ring-shaped fixed base 44 is equipped with a bottom grid capture net 42. The bottom grid capture net 42 adopts a hollow diamond grid structure with a grid aperture of 5mm and a grid thickness of 3mm. The overall structure is arranged in an interlaced maze, which blocks metal particles in multiple ways and greatly improves the particle escape prevention performance.

[0055] The outer surface of the embedded particle trap capturing component 4 is coated with a 0.2~0.5mm thick electric field optimization gradient coating. The coating uses a nonlinear resistivity functional gradient material. The resistivity of the coating increases gradually from the center of the built-in basin insulator 3 to the outer edge, thus optimizing the electric field distribution in the interface area between the flange and the insulator.

[0056] 6. Working Principle

[0057] During the operation of the high-voltage DC GIL, the central conductive rod 2 bears the DC high voltage, and the GIL metal shell 1 is filled with 0.5-0.6MPa SF6 insulating gas. Under the DC electric field condition, the vibration of equipment processing, assembly and operation generates metal suspended particles. Driven by the electric field force, the particles move towards the built-in basin insulator 3, the cylinder wall and the flange area. The annular embedded particle trap capture components 4 on both sides of the insulator guide the flow through the arc-shaped flange shield 43, intercept the suspended particles and make them fall into the wedge-shaped trap groove. The metal particles that settle to the bottom of the cylinder by their own weight directly pass through the bottom grid capture net 42 and enter the wedge-shaped groove.

[0058] The interior of the trap slot is a low electric field region, which significantly reduces the starting voltage of the particles. Combined with the high-damping insulating adsorption layer on the inner wall, it firmly locks the metal particles, completely preventing the particles from vibrating, rebounding, and escaping again. At the same time, the built-in basin-type insulator 3 adopts a gentle arc-shaped curved surface design, with the radial and tangential angles of the arc being less than 23° and the curvature radius of the surface being 250-450mm. Combined with the nonlinear gradient coating on the surface of the trap component, it reduces the normal electric field component on the surface of the insulator, effectively suppressing the accumulation of DC space charge. During equipment operation, the maximum local field strength of the insulator can be controlled within 12kV / mm.

[0059] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure, comprising two opposing GIL metal shells (1), wherein a metal flange one (11) and a metal flange two (12) are respectively welded and fixed to one opposite end of the two GIL metal shells (1), and the metal flange one (11) and the metal flange two (12) are fixed by bolts, characterized in that: The GIL metal housing (1) is sealed and fixed with an internal basin insulator (3), and the internal basin insulator (3) is located between metal flange one (11) and metal flange two (12). A central conductive rod (2) is fixed through the center of the internal basin insulator (3), and annular embedded particle trap capturing components (4) are symmetrically installed on both sides of the internal basin insulator (3). The built-in basin insulator (3) is provided with a pressure block (7) at its edge, and is fixed to the metal flange one (11) by the pressure block (7), and the pressure block (7) is located between the metal flange one (11) and the metal flange two (12); The mating surfaces of the metal flange one (11) and the metal flange two (12) are provided with a sealing structure (8). At the same time, the sprue of the built-in basin insulator (3) is bent and sealed within the sealing structure (8) of the two flanges.

2. The high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure according to claim 1, characterized in that: The cross-section of the built-in basin insulator (3) is a gently curved surface structure, and the radial and tangential angles of the insulator arc are less than 23°. The low-voltage end of the built-in basin insulator (3) is designed with a circular ground shield ring (5).

3. The high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure according to claim 2, characterized in that: The ground shielding ring (5) is an aluminum alloy ring with a diameter of 14mm. The ring-shaped ground shielding ring (5) has a notch (51). The notch (51) can effectively reduce the stress deformation of the epoxy and metal ground shielding ring (5) during the insulator casting and curing process. At the same time, six sets of fixing posts (52) are evenly welded on the ground shielding ring (5).

4. The high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure according to claim 3, characterized in that: The built-in basin insulator (3) is provided with three sets of equipotential bonding pins (6) to prevent the ground shielding ring (5) from floating partial discharge. The equipotential bonding pin (6) consists of a top cover (61), a push-out spring (62), a fixing pin fixture (63), and a fixing rod (64). All equipotential structural components are made of stainless steel. The fixing rod (64) is fastened to the fixing post (52) of the ground shielding ring (5) by threads. The top cover (61) is plugged into the upper end of the fixing rod (64), and a push-out spring (62) is provided between the top cover (61) and the fixing rod (64). The top cover (61) is pressed to the bottom along the axis of the fixing rod (64) so ​​that the fixing rod (64) is aligned with the through hole on the side wall of the top cover (61). The fixing pin fixture (63) is plugged into the through hole of the top cover (61) and the fixing rod (64).

5. The high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure according to claim 1, characterized in that: The embedded particle trap capturing assembly (4) includes an annular fixed base (44), bolt fixing countersunk holes (41), a bottom grid capturing mesh (42), and an arc-shaped flange shield (43). The bolt fixing countersunk holes (41) are evenly distributed along the circumference of the annular fixed base (44). The bottom grid capturing mesh (42) is located at the bottom of the annular fixed base (44). The arc-shaped flange shield (43) is symmetrically distributed on the outer walls at both ends of the annular fixed base (44).

6. The high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure according to claim 5, characterized in that: The two sets of embedded particle trap capturing components (4) are fixed to metal flange one (11) and metal flange two (12) respectively by means of hexagonal socket bolts passing through bolt fixing countersunk holes (41).

7. The high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure according to claim 6, characterized in that: The outer surface of the embedded particle trapping component (4) is coated with an electric field optimized gradient coating, and the coating is made of a nonlinear resistivity functional gradient material with a coating thickness of 0.2~0.5mm. The coating resistivity increases gradually from near the center of the insulator to the edge.

8. The high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure according to claim 5, characterized in that: The inner side of the annular fixed base (44) is a wedge-shaped gradient escape trap groove, with a high-damping insulating adsorption adhesive layer pasted on its inner side. The trap groove opening is wide, the bottom of the groove is narrow, and the side wall angle is 45°. At the same time, it has an internal arc-shaped shielding recess.

9. The high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure according to claim 5, characterized in that: The bottom grid capture net (42) adopts a hollow diamond grid structure with a grid aperture of 5mm and a grid thickness of 3mm, and is arranged in an interlaced maze structure.

10. The high-voltage DC GIL built-in basin-type insulator and embedded particle trap structure according to claim 1, characterized in that: The pressing block (7) consists of a pressing body (71) and a sealing and fixing ring (72). The pressing body (71) is fixed to the metal flange (11) by bolts, and it has an integrally formed folded edge on the side of the built-in basin insulator (3). The sealing and fixing ring (72) is located between the folded edge and the built-in basin insulator (3).

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