Metal particle capturing system of gas insulated switchgear
By combining dielectric gradient modification and electric field gradient force of the basin insulator, active capture of metal particles is achieved, solving the problem of poor metal particle capture effect in the prior art, and improving the electrical reliability and stability of gas-insulated combination electrical appliances.
Patent Information
- Application Number
- CN202510674494.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-23
- Publication Date
- 2025-08-12
AI Technical Summary
The existing gas-insulated combination electrical appliances have limited effect in capturing metal particles, and it is difficult to effectively suppress electric field distortion and faults caused by metal particles. Especially in DC and ultra-high voltage conditions, the existing solutions are difficult to cope with the dynamic threat of metal particles.
By modifying the basin insulator dielectric gradient, combining the high-voltage guide rod and the capture part to form an electric field gradient force and an electric field shielding area, the metal particles approach the capture part and enter the capture cavity under the action of the electric field gradient force, lose the drive of the electric field force, and fall into the capture cavity, realizing active capture of the metal particles.
It significantly improves the electrical reliability and stability of gas-insulated combination electrical appliances, reduces the potential for failure, reduces maintenance and power outage costs, and improves the stability and reliability of equipment in long-term operation.
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Figure CN120460137A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of gas-insulated switchgear, and in particular to a metal particle capture system for a gas-insulated switchgear. Background Art
[0002] Gas-insulated switchgear (GIS) is widely used in power supply systems due to its outstanding advantages, including safe operation, high reliability, small footprint, and electromagnetic environmental friendliness. However, during the manufacturing and operation processes, the presence of metal particles within the GIS is unavoidable. These free metal particles can cause electric field distortion in the insulation system, leading to air gap discharge or breakdown. When metal particles approach the insulator, they are attracted by the accumulated charge on the surface, further exacerbating surface charge accumulation and inducing surface flashover failures.
[0003] Therefore, metal particles need to be captured. Conventional technologies typically employ passive particle traps and active driving electrodes to capture metal particles. For example, passive particle traps employ grooves on the surface of a conductor, relying on the electric field shielding effect to capture particles. Active driving electrodes, on the other hand, utilize an external high-voltage electrode to generate a driving force field, actively driving metal particles away.
[0004] However, existing capture methods generally use a single technology to capture metal particles, and the capture effect is limited. Summary of the Invention
[0005] The present application provides a metal particle capture system for a gas-insulated combination electrical appliance, which can enable metal particles to approach a capture part under the action of an electric field gradient force. When the metal particles enter the capture cavity, they lose the electric field force drive and fall into the capture cavity, forming a dual synergistic suppression strategy, realizing the active capture of metal particles, improving the capture effect of metal particles, and significantly improving the overall electrical reliability and stability of the operation of the gas-insulated combination electrical appliance.
[0006] To achieve the above objectives, this application adopts the following technical solutions: The present application provides a metal particle capture system for a gas-insulated switchgear, comprising: A grounded housing is provided with a receiving cavity; A pot-type insulator is arranged in the accommodating cavity; A high-voltage guide rod is inserted into the pot-type insulator. A capture portion is provided on the high-voltage guide rod. The capture portion is located on at least one side of the pot-type insulator. A capture cavity is formed between the capture portion and the high-voltage guide rod. The opening of the capture cavity is arranged along the axial direction of the high-voltage guide rod. The pot-type insulator has a first end and a second end, the cross-sectional area of the first end is larger than the cross-sectional area of the second end, and along the direction from the first end to the second end, the pot-type insulator includes a first section, a second section and a third section distributed in sequence along the axial direction, the dielectric constant of the first section is smaller than the dielectric constant of the second section, and the dielectric constant of the second section is smaller than the dielectric constant of the third section.
[0007] In some possible implementations, a first capturing portion is provided on the high-voltage conducting rod, and the first capturing portion is located on one side of the convex surface of the pot-type insulator.
[0008] In some possible implementations, a first capture cavity is provided between the first capture portion and the high-voltage conducting rod, and an opening direction of the first capture cavity is away from the convex surface of the pot insulator.
[0009] In some possible implementations, a second capturing portion is further provided on the high-voltage conducting rod, and the second capturing portion and the first capturing portion are provided on both sides of the pot-type insulator.
[0010] In some possible implementations, a second capture cavity is provided between the second capture portion and the high-voltage conducting rod, and an opening direction of the second capture cavity is away from the concave surface of the pot insulator.
[0011] In some possible implementations, the capture portion is an annular capture portion that surrounds the high-voltage guide rod, and an annular capture cavity is defined between the annular capture portion and the high-voltage guide rod.
[0012] In some possible implementations, along the axial direction of the high-voltage guide rod, one end of the capture cavity has an opening, and the other end of the capture cavity is closed.
[0013] In some possible implementations, the dielectric constant of the first segment is 3-4, the dielectric constant of the second segment is 5-6, and the dielectric constant of the third segment is 7-8.
[0014] In some possible implementations, the pot-type insulator is an epoxy resin part or a silicone rubber part.
[0015] It can be seen from the above technical solution that this application has at least the following beneficial effects: In the present application, the basin insulator includes a first section, a second section, and a third section distributed in sequence. The dielectric constant of the first section is smaller than that of the second section, and the dielectric constant of the second section is smaller than that of the third section. That is, the basin insulator is subjected to dielectric gradient modification, so that the surface conductivity of the basin insulator is improved, the charge is easier to dissipate, and a low electric field region is formed at the junction of the three elements, thereby significantly reducing the motion range and starting rate of the metal particles; and the motion of the free metal particles near the basin insulator is regulated, and an electric field gradient force is generated on the metal particles away from the basin insulator, driving the metal particles away from the basin insulator, and effectively reducing the probability of the metal particles floating on the surface of the basin insulator and in its vicinity.
[0016] When metal particles continuously jump between the high-voltage conductor and the grounded shell, they are affected by the electric field gradient force, causing them to move toward the capture part. Since an electric field shielding area is formed between the capture part and the high-voltage conductor, when the metal particles move to this area, they will lose the electric field force drive and fall into the capture cavity, achieving the purpose of suppressing the activity of the metal particles and capturing the metal particles. The active capture of metal particles is realized, the distortion caused by metal particles is limited to a safe range, the formation of corona or discharge source is reduced, and the overall electrical reliability and stability of the operation of the gas-insulated combination electrical appliance are significantly improved.
[0017] The metal particle capture system for the gas-insulated combination electrical appliance provided in this application can be used as a preventive measure and is applicable to the equipment manufacturing stage. It can reduce the impact of metal particles on the internal contamination of the grounded casing from the source, so that the gas-insulated combination electrical appliance has better stability and reliability in long-term operation; since the hidden dangers of failure caused by metal particles are reduced, the maintenance and power outage costs due to failures can also be reduced.
[0018] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in this application does not imply that all features and advantages can be realized in any single embodiment. On the contrary, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution or beneficial effect is included in at least one embodiment. Therefore, the description of a technical feature, technical solution or beneficial effect in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the present embodiment can also be combined in any appropriate manner. Those skilled in the art will understand that the embodiment can be implemented without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A schematic diagram of a metal particle capture system for a gas-insulated switchgear provided in the present application in a specific embodiment; Figure 2 for Figure 1 Schematic diagram of the partially cutaway middle grounded housing; Figure 3 for Figure 1 sectional view of Figure 4 for Figure 3 Enlarged view of point I in the middle.
[0020] Figure numerals: 1-grounding shell; 11-accommodating cavity; 2-pot insulator; 21-first section; 22-second section; 23-third section; 3-high-voltage guide rod; 41-first capture part; 42-first capture cavity. DETAILED DESCRIPTION
[0021] The terms "first", "second" and "third" in this application specification and the accompanying drawings are used to distinguish different objects rather than to limit a specific order.
[0022] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.
[0023] To make the description of the following embodiments clear and concise, a brief introduction to the related technologies is first given: Gas Insulated Switchgear (GIS) is a compact power device that encapsulates electrical equipment such as circuit breakers, disconnectors, earthing switches, transformers, lightning arresters, busbars, and connectors in a metal casing and fills it with high dielectric strength gas (usually sulfur hexafluoride) as an insulating and arc-extinguishing medium.
[0024] However, during the manufacturing and operation processes, metal particles are inevitably present within GIS. These free metal particles can cause electric field distortion in the insulation system, leading to air gap discharge or breakdown. When metal particles approach the insulator, they are attracted by the accumulated charge on the surface, further exacerbating surface charge accumulation and inducing surface flashover failures.
[0025] Currently, there are four main methods for suppressing metal particles: 1. Passive particle trap: A groove structure is set on the surface of the conductor, relying on the electric field shielding effect to capture particles. However, the passive particle trap can only capture metal particles when they jump into the trap. The capture efficiency is low, especially for metal particles with a particle size of less than 100μm, the capture rate is less than 40%.
[0026] 2. Active driving electrode: The driving force field is generated by applying an external high-voltage electrode, but a voltage greater than 10kV needs to be continuously applied, which has high energy consumption and is prone to secondary discharge.
[0027] 3. Metal shielding ring: Metal shielding rings are installed at key locations to suppress electric field distortion, but this will increase the size of the equipment and change the original electric field distribution, and it lacks the ability to actively control the electromagnetic field.
[0028] 4. Traditional method: Use step-by-step voltage boosting to force metal particles to migrate to the low-field area, but it cannot cope with the dynamic threat of newly generated particles during operation.
[0029] The above technologies generally have the contradiction of "efficiency-energy consumption-compatibility". Especially under DC and UHV conditions, the movement activity of metal particles increases exponentially, and existing solutions are difficult to effectively suppress it.
[0030] Moreover, traditional insulators have high surface resistivity and long charge dissipation time, which exacerbates the electrostatic adsorption of metal particles.
[0031] From the above content, it can be seen that the existing capture methods generally use a single technology to capture metal particles, and the capture effect is limited. It is urgent to develop a synergistic active inhibition solution to fundamentally break through the inhibition limit of existing technologies on the activity of metal particles.
[0032] Therefore, an embodiment of the present application provides a metal particle capture system for a gas-insulated combination electrical appliance. By modifying the dielectric gradient of the basin insulator, the surface charge can be quickly dissipated, the tip field strength caused by charge accumulation can be reduced, and an electric field gradient force is generated on the metal particles near the basin insulator, driving the metal particles away from the basin insulator and causing the metal particles to approach the capture part; the capture cavity between the capture part and the high-voltage conductor forms an electric field shielding area, so that the metal particles moving into the capture cavity lose the electric field force drive and then fall into the capture cavity, thereby achieving the purpose of suppressing the activity of the metal particles and capturing the metal particles.
[0033] The metal particle capture system for a gas-insulated combination electrical appliance provided in an embodiment of the present application effectively combines the dielectric gradient modification of a basin-type insulator with the electromagnetic shielding structure formed between the high-voltage guide rod and the capture portion, forming a dual synergistic suppression strategy. This allows metal particles to approach the capture portion under the action of the electric field gradient force. When the metal particles enter the capture cavity, they lose the electric field force drive and fall into the capture cavity, achieving active capture of the metal particles and providing a new technical approach for metal particle suppression. By changing the material properties and field distribution, the probability of metal particles floating on and near the surface of the basin-type insulator is effectively reduced, thereby fundamentally improving the tolerance of the gas-insulated combination electrical appliance to metal particle intrusion.
[0034] The following describes the metal particle capture system of the gas-insulated switchgear provided in the embodiment of the present application in conjunction with the accompanying drawings: like Figure 1-4As shown, the metal particle capture system includes a grounding shell 1, a basin insulator 2 and a high-voltage conductor 3; the grounding shell 1 is provided with a accommodating cavity 11; the basin insulator 2 is arranged in the accommodating cavity 11; the high-voltage conductor 3 is inserted into the basin insulator 2, and a capturing portion is provided on the high-voltage conductor 3, the capturing portion is located on at least one side of the basin insulator 2, and a capturing cavity is provided between the capturing portion and the high-voltage conductor 3, and the opening of the capturing cavity is arranged along the axial direction of the high-voltage conductor 3.
[0035] Among them, the pot insulator 2 includes a first section 21, a second section 22 and a third section 23 distributed along the axial direction. The pot insulator 2 has a first end and a second end. The cross-sectional area of the first end is larger than the cross-sectional area of the second end, that is, the first end is the large end of the pot insulator 2, and the second end is the small end of the pot insulator 2. Along the direction from the first end to the second end, the first section 21, the second section 22 and the third section 23 are distributed in sequence. The dielectric constant of the first section 21 is smaller than the dielectric constant of the second section 22, and the dielectric constant of the second section 22 is smaller than the dielectric constant of the third section 23.
[0036] Among them, the grounded shell 1 serves as the conductive shell of the gas-insulated combination electrical appliance. The grounded shell 1 is directly connected to the ground, providing a reliable grounding channel for the electrical equipment, ensuring the stability of the potential of the electrical equipment during normal operation and fault conditions, and preventing the risk of electric shock; the grounded shell 1 also withstands internal gas pressure (usually sulfur hexafluoride gas) and external mechanical loads (such as earthquakes, wind, etc.), protecting internal high-voltage guide rods 3, pot insulators 2 and other components from external damage.
[0037] The grounding shell 1 can be made of aluminum alloy or stainless steel, and the surface can be polished or coated to reduce tip discharge.
[0038] The pot insulator 2 is used to isolate the grounding shell 1 from the high-voltage conductor 3, withstand the power frequency voltage, impulse voltage and operating overvoltage during the operation of electrical equipment, and prevent surface discharge; the pot insulator 2 also supports the high-voltage conductor 3, fixes the spatial position of the high-voltage conductor 3, and ensures the stability of the electrical gap between the high-voltage conductor 3 and the grounding shell 1; the pot insulator 2 serves as a separator between different gas chambers to prevent gas leakage between adjacent gas chambers, facilitating the maintenance of electrical equipment in different areas.
[0039] The high-voltage conductor 3 is the core conductive component of the gas-insulated combination electrical apparatus, transmitting high-voltage electrical energy and connecting components such as circuit breakers, disconnectors, and transformers. The cross-section of the high-voltage conductor 3 is usually circular or hollow cylindrical, with a smooth surface without burrs to evenly distribute the electric field and reduce corona discharge and local overheating.
[0040] In this embodiment, the pot insulator 2 includes a first section 21, a second section 22, and a third section 23, which are distributed in sequence. The dielectric constant of the first section 21 is smaller than that of the second section 22, and the dielectric constant of the second section 22 is smaller than that of the third section 23. That is, the pot insulator 2 is subjected to dielectric gradient modification, so that the surface conductivity of the pot insulator 2 is improved, the charge is more easily dissipated, and a low electric field region is formed at the three-way junction, thereby significantly reducing the motion range and starting rate of the metal particles. In addition, the motion of free metal particles near the pot insulator 2 is regulated, and an electric field gradient force is generated on the metal particles away from the pot insulator 2, driving the metal particles away from the pot insulator 2, and effectively reducing the probability of metal particles floating on the surface of the pot insulator 2 and in its vicinity.
[0041] When metal particles continuously jump between the high-voltage conductor 3 and the grounded shell 1, they are subjected to the electric field gradient force, causing the metal particles to move toward the capture part. Since an electric field shielding area is formed between the capture part and the high-voltage conductor 3, when the metal particles move to this area, they will lose the electric field force drive and fall into the capture cavity, thereby achieving the purpose of suppressing the activity of the metal particles and capturing the metal particles. The active capture of metal particles is realized, the distortion caused by metal particles is limited to a safe range, the formation of corona or discharge source is reduced, and the overall electrical reliability and stability of the operation of the gas-insulated combination electrical appliance are significantly improved.
[0042] The metal particle capture system for a gas-insulated combination electrical appliance provided in the embodiment of the present application can be used as a preventive measure and is applicable to the equipment manufacturing stage. It can reduce the impact of metal particles on the internal contamination of the grounded casing 1 from the source, so that the gas-insulated combination electrical appliance has better stability and reliability in long-term operation; since the hidden dangers of failure caused by metal particles are reduced, the maintenance and power outage costs can also be reduced.
[0043] Specifically, the first section 21 , the second section 22 and the third section 23 are integrally formed to form the pot-type insulator 2 .
[0044] Specifically, along the axial direction of the high-voltage guide rod 3 , one end of the capture cavity has an opening, and the other end of the capture cavity is closed.
[0045] The metal particles move from the opening of the capture chamber into the capture chamber, where they lose the electric field force and fall into the capture chamber. The capture chamber is a structure with one end open and the other end closed, which reduces the risk of metal particles falling outside the capture chamber after entering the capture chamber and improves the capture rate.
[0046] In some embodiments, the capture portion and the high-voltage guide rod 3 are integrally formed, resulting in higher structural strength and greater durability.
[0047] The pot-type insulator 2 has both convex and concave surfaces. The convex surface disperses accumulated static charge along the convex surface, reducing local charge density. For example, under surge voltage, the convex surface provides a longer charge migration path, facilitating charge release through leakage current and minimizing the risk of surface flashover.
[0048] The surface of the grounding shell 1 may generate a local electric field due to eddy current or electrostatic induction. The concave shape of the surface can keep the pot insulator 2 away from the strong electric field area of the inner wall of the grounding shell 1, avoiding the superposition of electric fields on the insulation surface.
[0049] In a specific embodiment, Figure 2 As shown, a first catching portion 41 is provided on the high-voltage guide rod 3 , and the first catching portion 41 is located on one side of the convex surface of the pot insulator 2 .
[0050] The convex surface is a high-risk area for charge accumulation on the surface of the pot insulator 2.
[0051] The first capture portion 41 is located on one side of the convex surface of the pot insulator 2. The metal particles near the convex surface of the pot insulator 2 approach the first capture portion 41 under the action of the electric field gradient force. The direction of the electric field gradient force is referenced to Figure 3 A direction; since the first capture cavity 42 is an electric field shielding area, when the metal particles enter the first capture cavity 42, they lose the electric field force driving them and then fall into the first capture cavity 42, completing the capture of the metal particles, effectively reducing the probability of the metal particles floating on the convex surface of the basin insulator 2 and its vicinity, thereby effectively reducing the influence of the metal particles on the insulating performance of the convex surface, thereby reducing the risk of surface flashover.
[0052] Specifically, if Figure 3-4 As shown, a first capturing cavity 42 is provided between the first capturing portion 41 and the high-voltage conducting rod 3 , and the opening direction of the first capturing cavity 42 is away from the convex surface of the pot-type insulator 2 .
[0053] The opening direction of the first capture chamber 42 is Figure 3 The B direction.
[0054] In this embodiment, the opening direction of the first capture cavity 42 is away from the convex surface of the basin insulator 2, so as to prevent the introduction of an induced electric field into the first capture cavity 42 when the opening of the first capture cavity 42 is toward the convex surface, thereby destroying the electric field shielding area formed in the first capture cavity 42 and preventing the metal particles entering the first capture cavity 42 from being driven by the electric field force and escaping from the first capture cavity 42.
[0055] A plurality of first capturing portions 41 may be provided on the high-voltage guide rod 3 , and the plurality of first capturing portions 41 are spaced apart along the axial direction of the high-voltage guide rod 3 to capture more metal particles.
[0056] In a specific embodiment, a second catching portion is further provided on the high-voltage guide rod 3 , and the second catching portion and the first catching portion 41 are respectively provided on both sides of the pot insulator 2 .
[0057] The metal particles may migrate to the vicinity of the concave surface due to the vibration of the grounded housing 1 , the flow of insulating gas in the grounded housing 1 , and the like.
[0058] In this embodiment, a second capturing portion is provided on one side of the concave surface of the pot insulator 2 . When metal particles near the concave surface move into the second capturing cavity, the metal particles are captured, thereby reducing the impact of the metal particles on the concave surface of the pot insulator 2 .
[0059] By arranging the capture portions on both sides of the pot-type insulator 2 , potential sources of metal particles on both sides of the pot-type insulator 2 are covered, thereby improving the capture efficiency.
[0060] Specifically, a second capturing cavity is defined between the second capturing portion and the high-voltage conducting rod 3 , and the opening direction of the second capturing cavity is away from the concave surface of the pot-type insulator 2 .
[0061] In this embodiment, the opening direction of the second capture cavity is away from the concave surface of the pot insulator 2, which prevents the electric field force from driving the second capture cavity and escaping, thereby preventing insulation defects in the pot insulator 2.
[0062] A plurality of second capturing portions may be provided on the high-voltage guide rod 3 , and the plurality of second capturing portions are spaced apart along the axial direction of the high-voltage guide rod 3 to capture more metal particles.
[0063] exist Figure 2 In the illustrated embodiment, the capturing portion is an annular capturing portion, which surrounds the high-voltage guide rod 3 , and an annular capturing cavity is defined between the annular capturing portion and the high-voltage guide rod 3 .
[0064] In this embodiment, an annular capture cavity is formed between the annular capture portion and the high-voltage guide rod 3, which increases the layout area of the capture cavity in the grounded shell 1, making it more likely that metal particles will move into the capture cavity, thereby further increasing the capture amount of metal particles.
[0065] In a specific embodiment, the dielectric constant of the first section 21 is 3-4, the dielectric constant of the second section 22 is 5-6, and the dielectric constant of the third section 23 is 7-8.
[0066] For example, the dielectric constant of the first section is 4, the dielectric constant of the second section is 6, and the dielectric constant of the third section is 8. This can accurately match the electric field distribution with the force on the metal particles, drive the metal particles into the capture cavity between the capture part and the high-voltage guide rod 3 to a large extent, and improve the capture rate of the metal particles.
[0067] In a specific embodiment, the pot-type insulator 2 is an epoxy resin piece.
[0068] Epoxy resin has a high dielectric strength and can withstand the high-voltage electric field of tens of thousands of volts in gas-insulated combination electrical appliances, effectively isolating the high-voltage conductor 3 from the grounded casing 1 to prevent surface discharge or breakdown; epoxy resin is not easily carbonized or decomposed under the action of long-term corona discharge, and can inhibit local discharge caused by metal particles or uneven electric fields in gas-insulated combination electrical appliances, thereby extending the life of the equipment; after curing, epoxy resin has high bending strength and compressive strength, and can withstand the insulating gas pressure and installation stress inside the gas-insulated combination electrical appliances; epoxy resin has higher toughness and is not easily cracked by vibration, temperature changes or mechanical impact, making it suitable for complex working conditions.
[0069] Specifically, the preparation method of the pot-type insulator 2 includes: S1, epoxy resin and filler pretreatment.
[0070] Specifically, powders such as epoxy resin, Al2O3 (aluminum oxide), SiO2 (silicon oxide) and BaTiO3 (barium titanate) are placed in a vacuum oven for preheating and drying to remove moisture from the filler and prevent agglomeration, thereby increasing the fluidity of the epoxy resin.
[0071] S2. Mould processing.
[0072] Specifically, after cleaning the mold of the basin-type insulator 2, a release agent is sprayed on it to ensure that the inner wall of the mold is dry.
[0073] S3. Mix base material.
[0074] Specifically, the epoxy resin and the curing agent are mixed in proportion, and the filler pretreated in step S1 is added and stirred to form a uniform mixed liquid.
[0075] S4, layered casting and gelation.
[0076] Specifically, the mixed liquid is poured into the preheated mold layer by layer, and each layer is left to stand until a gel state is formed after pouring; the pouring is repeated until the last layer is completed, forming a basin-type insulator 2 blank with a dielectric constant gradient distribution.
[0077] S5. Vacuum curing.
[0078] The cast body is vacuumed to eliminate bubbles, and then layered solidification is completed at a set temperature.
[0079] In other embodiments, the pot-type insulator 2 may also be a silicone rubber piece.
[0080] An embodiment of the present application further provides a gas-insulated combination electrical apparatus, comprising the metal particle capture system described in any one of the above embodiments.
[0081] The gas-insulated combination electrical apparatus provided in the embodiment of the present application performs dielectric gradient modification on the basin insulator 2, thereby improving the surface conductivity of the basin insulator 2 and making it easier for electric charge to dissipate. At the same time, a low electric field region is formed at the junction of the three junctions, thereby significantly reducing the movement range and starting rate of the metal particles. In addition, the movement of free metal particles near the basin insulator 2 is regulated, and an electric field gradient force is generated on the metal particles away from the basin insulator 2, driving the metal particles away from the basin insulator 2, thereby effectively reducing the probability of metal particles floating on and near the surface of the basin insulator 2.
[0082] When metal particles continuously jump between the high-voltage conductor 3 and the grounded shell 1, they are subjected to the electric field gradient force, causing the metal particles to move toward the capture part. Since an electric field shielding area is formed between the capture part and the high-voltage conductor 3, when the metal particles move to this area, they will lose the electric field force drive and fall into the capture cavity, thereby achieving the purpose of suppressing the activity of the metal particles and capturing the metal particles. The active capture of metal particles is realized, the distortion caused by metal particles is limited to a safe range, the formation of corona or discharge source is reduced, and the overall electrical reliability and stability of the operation of the gas-insulated combination electrical appliance are significantly improved.
[0083] The influence of metal particles on the internal pollution of the grounded housing 1 is reduced from the source, so that the gas-insulated switchgear has better stability and reliability in long-term operation; since the hidden dangers of failure caused by metal particles are reduced, the maintenance and power outage costs can also be reduced.
[0084] The above description is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application should be included in the protection scope of the present application.
Claims
1. A metal particle capture system for a gas-insulated switchgear, characterized in that: include: A grounded housing is provided with a receiving cavity; A pot-type insulator is arranged in the accommodating cavity; A high-voltage guide rod is inserted into the pot-type insulator, wherein the high-voltage guide rod is provided with a capture portion, the capture portion is located on at least one side of the pot-type insulator, a capture cavity is defined between the capture portion and the high-voltage guide rod, and the opening of the capture cavity is provided along the axial direction of the high-voltage guide rod; The pot-type insulator has a first end and a second end, the cross-sectional area of the first end is larger than the cross-sectional area of the second end, and along the direction from the first end to the second end, the pot-type insulator includes a first segment, a second segment, and a third segment distributed in sequence along the axial direction, the dielectric constant of the first segment is smaller than the dielectric constant of the second segment, and the dielectric constant of the second segment is smaller than the dielectric constant of the third segment.
2. The metal particle capturing system for a gas-insulated switchgear according to claim 1, characterized in that: The high-voltage guide rod is provided with a first capturing portion, and the first capturing portion is located on one side of the convex surface of the pot-type insulator.
3. The metal particle capturing system for a gas-insulated switchgear according to claim 2, wherein: A first capturing cavity is defined between the first capturing portion and the high-voltage conducting rod, and an opening direction of the first capturing cavity is away from the convex surface of the pot-type insulator.
4. The metal particle capturing system for a gas-insulated switchgear according to claim 2, wherein: The high-voltage guide rod is further provided with a second capturing portion, and the second capturing portion and the first capturing portion are arranged on both sides of the pot-type insulator.
5. The metal particle capturing system for a gas-insulated switchgear according to claim 4, characterized in that: A second capturing cavity is defined between the second capturing portion and the high-voltage conducting rod, and an opening direction of the second capturing cavity is away from the concave surface of the basin-type insulator.
6. The metal particle capturing system for a gas-insulated switchgear according to claim 1, wherein: The capturing portion is an annular capturing portion, which surrounds the high-voltage guide rod, and an annular capturing cavity is defined between the annular capturing portion and the high-voltage guide rod.
7. The metal particle capturing system for a gas-insulated switchgear according to claim 1, wherein: Along the axial direction of the high-pressure guide rod, one end of the capture cavity has an opening, and the other end of the capture cavity is closed.
8. The metal particle capturing system for a gas-insulated switchgear according to claim 1, wherein: The dielectric constant of the first segment is 3-4, the dielectric constant of the second segment is 5-6, and the dielectric constant of the third segment is 7-8.
9. The metal particle capturing system for a gas-insulated switchgear according to claim 1, wherein: The pot-type insulator is an epoxy resin part or a silicone rubber part.