Anti-overcompensation device for SF6 meter

Abstract

The embodiment of the invention provides an anti-overcompensation device for an SF6 meter. An SF6 density relay main body is packaged in a stainless steel shell. The transparent heat insulation cover is installed at the first opening, the first air heat insulation layer blocks direct transfer of heat through the low heat conduction characteristic of air, meanwhile, good light transmission is kept, and workers can directly observe the operation state of the main body conveniently. According to the SF6 meter anti-overcompensation device, the nanometer sunscreen heat insulation film on the side, away from the main body, of the transparent heat insulation cover can efficiently reflect infrared rays and ultraviolet rays in solar radiation, and invasion of an external heat source is reduced; the nanometer heat insulation material layer close to one side of the main body further obstructs heat conduction, and heat absorbed by the transparent heat insulation cover is prevented from being transferred inwards; and the nano aerogel heat insulation layer on the inner wall of the stainless steel shell completely wraps the internal space, so that the heat absorbed by the stainless steel shell is prevented from diffusing to the SF6 density relay main body, and the working environment temperature of the SF6 density relay main body is effectively stabilized.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrical equipment monitoring technology, and in particular to an SF6 meter over-compensation device. Background Technology

[0002] As a key device for monitoring SF6 gas density in high-voltage electrical equipment, the measurement accuracy of SF6 density relays directly affects the safe and stable operation of the equipment. In outdoor applications, SF6 density relays are exposed to the natural environment for extended periods and are susceptible to factors such as direct sunlight and sudden temperature changes. Solar radiation can cause the relay body temperature to rise rapidly, and drastic temperature fluctuations can trigger overcompensation in its internal density measurement, leading to false alarms. In severe cases, this can interfere with the normal operation and maintenance decisions of the power system.

[0003] Currently, technological improvements to SF6 density relays largely focus on optimizing the sensor's own performance, such as improving measurement sensitivity through modifications to core components like gas-sensitive materials and other nano-sensor components. However, insufficient attention is paid to the systematic thermal insulation and protection design of the overall meter structure. Existing technologies lack an integrated solution that simultaneously meets the following requirements: ensuring transparent observation of the relay's operating status for real-time monitoring, achieving multiple layers of efficient thermal insulation to stabilize its operating temperature, and providing protection against external environmental erosion such as wind, rain, and dust. This technological gap makes it difficult to fully guarantee the stability and reliability of SF6 density relays in complex outdoor environments, and the problem of false alarms caused by overcompensation remains unresolved. Summary of the Invention

[0004] The purpose of this invention is to provide an over-compensation protection device for SF6 meters, which aims to solve the technical problem of false alarms caused by over-compensation in existing SF6 meters due to drastic temperature changes caused by direct sunlight outdoors.

[0005] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides an SF6 meter over-compensation device, comprising:

[0006] SF6 density relay body;

[0007] The stainless steel housing contains the SF6 density relay body, which has a first opening located directly in front of the observation surface of the SF6 density relay body and a second opening located at the bottom of the SF6 density relay body.

[0008] A transparent heat insulation cover is provided at the first opening, and a first air heat insulation layer is provided between the transparent heat insulation cover and the observation surface of the SF6 density relay body;

[0009] Composite thermal insulation structures include:

[0010] Nano-sunscreen and heat-insulating film covering the side of the transparent heat insulation cover away from the SF6 density relay body.

[0011] A layer of nano-insulating material covering the transparent heat insulation cover near the SF6 density relay body.

[0012] A nano-aerogel insulation layer covering the inner wall of the stainless steel outer shell.

[0013] In some embodiments, the transparent heat insulation cover is made of tempered glass, the nano-heat insulation material layer is made of yttrium oxide stabilized zirconium oxide nanoparticle layer, the thickness of the nano-heat insulation material layer is 80-100 nm, and the area covering the surface of the transparent heat insulation cover away from the SF6 density relay body is not less than 95%;

[0014] The nanoparticles in the nano-insulation material layer have a particle size of no more than 100 nm and a porosity of less than 5%.

[0015] In some embodiments, the nano-aerogel insulation layer is composed of SiO2 aerogel and ceramic fiber in a 3:1 mass ratio, with a thickness of 2.5±0.5mm. The inner wall of the stainless steel shell is roughened by sandblasting, and the nano-aerogel insulation layer is attached to the inner wall of the stainless steel shell.

[0016] In some embodiments, the stainless steel housing includes a top plate located on top of the SF6 density relay body, two side plates located on both sides of the SF6 density relay body and connected to the top plate, a back plate located on the side of the SF6 density relay body away from the observation surface, and a front panel located directly in front of the observation surface of the SF6 density relay body. The first opening is formed in the front panel, and the two side plates, the back plate, and the side of the front panel away from the top plate together form the second opening. An extension plate extending toward the side away from the back plate is provided on the top of the front panel.

[0017] In some embodiments, both the top plate and the extension plate are flat plate structures, with the extension plate flush with the top plate, and the SF6 density relay body is fixed to the top of the inner wall of the stainless steel housing by a first locking member.

[0018] In some embodiments, the SF6 meter over-compensation device further includes a PTFE pressure plate with a first through hole. The axial side opening of the first through hole has a flared portion adapted to the transparent heat insulation cover. The PTFE pressure plate is disposed on the front panel, and the first opening is coaxial with the first through hole. The transparent heat insulation cover is located inside the flared portion, and the flared portion faces the front panel.

[0019] In some embodiments, the SF6 meter over-compensation device further includes a fixed pressure plate having a second through hole, the second through hole being coaxial with the first through hole, the fixed pressure plate being disposed on the side of the PTFE pressure plate away from the front panel, the fixed pressure plate having a guide post, the guide post penetrating the fixed pressure plate and extending to the front panel, the guide post being fixedly connected to the front panel by a second locking member.

[0020] In some embodiments, both the top plate and the extension plate are arc-shaped structures and protrude toward the side away from the SF6 density relay body. The extension plate is located on the side of the top plate away from the SF6 density relay body. The SF6 meter over-compensation device further includes at least two spaced PTFE gaskets sandwiched between the SF6 density relay body and the inner wall of the stainless steel housing, and a crossbar connected to both side plates. The PTFE gaskets are annular structures, with the inner annular surface of the PTFE gaskets fitting against the SF6 density relay body and the outer annular surface of the PTFE gaskets fitting against the inner wall of the stainless steel housing. The thickness of the PTFE gaskets is 2.5 ± 0.2 mm. The crossbar is connected to both side plates and is located on the side of the PTFE gaskets away from the top plate.

[0021] In some embodiments, the two side plates are symmetrically provided with ventilation louvers, the central axis of which is aligned with the center of the heat dissipation hole of the SF6 density relay body, and the louver angle is 45±2°; the inner side of the ventilation louvers is covered with a dustproof nanofiber filter with a pore size of 50±5μm, and the edge of the dustproof nanofiber filter is laser-welded to the frame of the ventilation louvers; a drainage groove is provided below the ventilation louvers, and the bottom of the drainage groove is 12-15mm lower than the bottom surface of the SF6 density relay body.

[0022] This invention also provides an installation method for the SF6 meter over-compensation device as described above, comprising:

[0023] The nano-sunscreen and heat-insulating film is attached to the side of the transparent heat insulation cover away from the SF6 density relay body, and the nano-heat-insulating material layer is coated on the side of the transparent heat insulation cover close to the SF6 density relay body.

[0024] The nano-aerogel insulation layer is coated onto the inner wall of the stainless steel outer shell;

[0025] The SF6 density relay body is fixed inside the stainless steel housing;

[0026] The transparent heat insulation cover is placed at the first opening.

[0027] Compared with the prior art, the SF6 meter overcompensation device of the present invention has at least the following beneficial effects:

[0028] This invention discloses an overcompensation device for SF6 meters. The device achieves stable temperature control through the synergistic effect of multiple heat insulation structures. The SF6 density relay body is encapsulated within a stainless steel casing. The stainless steel casing forms a relatively closed protective space through a first opening and a second opening at the bottom, blocking direct impact from the external environment while providing a channel for internal air circulation and wiring connections. A transparent heat insulation cover is installed at the first opening. The first air insulation layer between the cover and the observation surface of the SF6 density relay body utilizes the low thermal conductivity of air to block direct heat transfer while maintaining good light transmittance, allowing operators to directly observe the operating status of the main body.

[0029] The composite heat insulation structure of the SF6 meter overcompensation device of this invention forms a complete protection system from three layers: the nano-sunscreen and heat-insulating film on the side of the transparent heat insulation cover away from the main body can efficiently reflect infrared and ultraviolet rays in solar radiation, reducing the intrusion of external heat sources; the nano-heat insulation material layer on the side closer to the main body further blocks heat conduction, preventing the heat absorbed by the transparent heat insulation cover from being transferred to the interior; the nano-aerogel heat insulation layer on the inner wall of the stainless steel shell completely wraps the internal space, inhibiting the diffusion of heat absorbed by the stainless steel shell to the SF6 density relay body. The combination of these three elements forms a multi-layer heat insulation mechanism of "reflection-blocking-envelopment", effectively stabilizing the operating environment temperature of the SF6 density relay body.

[0030] This invention precisely controls the temperature fluctuation of the main body through a multi-layer thermal insulation structure, fundamentally avoiding density measurement deviations caused by drastic changes in ambient temperature and solving the overcompensation problem. The stainless steel shell provides reliable mechanical protection against external erosion such as wind, rain, and dust, extending the service life of the equipment. The transparent thermal insulation cover design combines thermal insulation and observation functions, allowing monitoring to be completed without disassembly, reducing operation and maintenance costs. The combination of air insulation layer and composite thermal insulation material achieves a lightweight design, without significantly increasing the weight of the equipment, making it suitable for various installation scenarios and improving the applicability of the equipment.

[0031] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A three-dimensional cross-sectional view of the SF6 meter overcompensation device provided in an embodiment of the present invention;

[0034] Figure 2 This is an exploded view of the SF6 meter overcompensation device provided in an embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of the stainless steel housing of the SF6 meter overcompensation device provided in an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the PTFE pressure plate of the SF6 meter overcompensation device provided in an embodiment of the present invention;

[0037] Figure 5 A three-dimensional cross-sectional view of another SF6 meter overcompensation device provided in an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. SF6 density relay body;

[0040] 2. Transparent heat insulation cover;

[0041] 3. Stainless steel casing; 31. Top plate; 32. Side plate; 33. Back plate; 34. Front panel; 341. First opening; 35. Extension plate;

[0042] 4. PTFE pressure plate; 41. First through hole; 42. Flared end;

[0043] 5. Fixed pressure plate; 51. Second through hole; 52. Guide post;

[0044] 61. First locking component; 62. Second locking component;

[0045] 71. PTFE gasket; 72. Crossbar. Detailed Implementation

[0046] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0047] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] like Figure 1-5 As shown, this embodiment of the invention provides an SF6 meter over-compensation device, comprising:

[0050] SF6 density relay body 1;

[0051] Stainless steel housing 3, the SF6 density relay body 1 is disposed inside the stainless steel housing 3, the stainless steel housing 3 has a first opening 341 located directly in front of the observation surface of the SF6 density relay body 1 and a second opening located at the bottom of the SF6 density relay body 1;

[0052] A transparent heat insulation cover 2 is provided at the first opening 341, and a first air heat insulation layer is provided between the transparent heat insulation cover 2 and the observation surface of the SF6 density relay body 1.

[0053] Composite thermal insulation structures include:

[0054] Nano-sunscreen and heat-insulating film covering the side of the transparent heat insulation cover 2 away from the SF6 density relay body 1.

[0055] The transparent heat insulation cover 2 is a nano-heat insulation material layer on the side near the SF6 density relay body 1.

[0056] A nano-aerogel insulation layer covers the inner wall of the stainless steel outer shell 3.

[0057] In this embodiment, the SF6 meter over-compensation device achieves stable temperature control through the synergistic effect of multiple heat insulation structures. The SF6 density relay body 1 is encapsulated inside a stainless steel shell 3. The stainless steel shell 3 forms a relatively closed protective space through a first opening 341 and a second opening at the bottom, which not only blocks the direct impact of the external environment but also provides a channel for internal air circulation and wiring connections. A transparent heat insulation cover 2 is installed at the first opening 341. The first air heat insulation layer between the cover and the observation surface of the SF6 density relay body 1 utilizes the low thermal conductivity of air to block direct heat transfer while maintaining good light transmittance, allowing staff to directly observe the operating status of the SF6 density relay body 1.

[0058] The composite heat insulation structure of the SF6 meter overcompensation device in this embodiment forms a complete protection system from three levels: the nano-sunscreen and heat-insulating film on the side of the transparent heat insulation cover 2 away from the SF6 density relay body 1 can efficiently reflect infrared and ultraviolet rays in solar radiation, reducing the intrusion of external heat sources; the nano-heat insulation material layer on the side closer to the SF6 density relay body 1 further blocks heat conduction, preventing the heat absorbed by the transparent heat insulation cover 2 from being transferred to the interior; the nano-aerogel heat insulation layer on the inner wall of the stainless steel shell 3 completely wraps the internal space, inhibiting the diffusion of heat absorbed by the stainless steel shell 3 to the SF6 density relay body 1. The combination of the three forms a multi-layer heat insulation mechanism of "reflection-blocking-envelopment", effectively stabilizing the operating environment temperature of the SF6 density relay body 1.

[0059] This embodiment precisely controls the temperature fluctuation of the SF6 density relay body 1 through a multi-layer thermal insulation structure, fundamentally avoiding density measurement deviations caused by drastic changes in ambient temperature and solving the overcompensation problem. The stainless steel shell 3 provides reliable mechanical protection against external corrosion such as wind, rain, and dust, extending the service life of the equipment. The transparent thermal insulation cover 2 is designed to combine thermal insulation and observation functions, allowing monitoring to be completed without disassembly, reducing operation and maintenance costs. The combination of air insulation layer and composite thermal insulation material achieves a lightweight design, without significantly increasing the weight of the equipment, making it suitable for various installation scenarios and improving the applicability of the equipment.

[0060] In some embodiments, the transparent heat insulation cover 2 is made of tempered glass, the nano-heat insulation material layer is made of yttrium oxide stabilized zirconium oxide nanoparticle layer, the thickness of the nano-heat insulation material layer is 80-100nm, and the area covering the surface of the transparent heat insulation cover 2 away from the SF6 density relay body 1 is not less than 95%;

[0061] The nanoparticles in the nano-insulation material layer have a particle size of no more than 100 nm and a porosity of less than 5%.

[0062] In this embodiment, the transparent heat shield 2 is made of tempered glass, whose high strength can withstand external impacts, preventing damage to the observation window caused by collisions, while maintaining good light transmittance to ensure that the clarity of observation is not affected.

[0063] The nano-insulation material layer uses yttrium oxide-stabilized zirconia nanoparticles. Its 80-100nm thickness ensures effective insulation without excessively increasing the weight and thickness of the transparent heat shield 2. This material itself has low thermal conductivity, and combined with nanoparticles no larger than 100nm, it can block heat conduction paths through interparticle interface scattering. The porosity of less than 5% reduces air convection within the layer, further lowering heat transfer efficiency. The design, covering at least 95% of the area, ensures effective insulation protection for most of the transparent heat shield 2, preventing localized heat concentration from affecting the temperature stability of the SF6 density relay body 1.

[0064] The weather resistance and impact resistance of tempered glass enhance the device's environmental adaptability, enabling it to operate stably for extended periods even under harsh outdoor conditions. The unique structure of the yttrium oxide-stabilized zirconia nanoparticle layer allows it to maintain its thermal insulation performance even at high temperatures, solving the problem of high-temperature failure in traditional thermal insulation materials. The small particle size and low porosity design make the thermal insulation layer denser, resulting in a better fit with the transparent thermal insulation cover 2 and preventing thermal bridging effects caused by interlayer gaps. The high coverage area ensures no dead angles in thermal insulation, and in conjunction with other thermal insulation structures, further improves the overall temperature control accuracy, providing a more reliable environmental guarantee for the accurate measurement of the SF6 density relay body 1 and reducing measurement errors caused by temperature fluctuations.

[0065] In some embodiments, the nano-aerogel insulation layer is composed of SiO2 aerogel and ceramic fiber in a 3:1 mass ratio, with a thickness of 2.5±0.5mm. The inner wall of the stainless steel shell 3 is roughened by sandblasting, and the nano-aerogel insulation layer is attached to the inner wall of the stainless steel shell 3.

[0066] In this embodiment, the nano-aerogel insulation layer is composed of SiO2 aerogel and ceramic fibers in a 3:1 mass ratio. SiO2 aerogel itself has an extremely low thermal conductivity, making it an excellent insulation material, while ceramic fibers enhance the material's mechanical strength and flexibility, avoiding the fragility of pure aerogel. The composite material retains the high-efficiency insulation performance of aerogel while improving the structural stability of the insulation layer, enabling it to adapt to vibrations and temperature changes during equipment operation.

[0067] Table 1 shows the comparison of the formulation and performance of aerogel composite layers.

[0068]

[0069] As shown in Table 1, with the increase of the mass ratio of SiO2 aerogel in the composite layer (and the corresponding decrease of the ceramic fiber ratio), the thermal conductivity gradually decreases, while the adhesion shows a non-linear increase. Specifically, when the ratio reaches 3:1, the thermal conductivity drops to a minimum of 0.019 W / m·K, while the adhesion shows a significant jump, reaching 15.8 MPa, an improvement of 26.4% compared to the 2:1 ratio. This indicates that the 3:1 ratio, while ensuring optimal thermal insulation performance, unexpectedly solves the problem of coating detachment under high vibration environments, achieving synergistic optimization of thermal insulation and adhesion.

[0070] Testing standards:

[0071] Thermal conductivity: GB / T 10295-2008 (steady-state heat flow method, constant temperature at 50℃);

[0072] Adhesion: GB / T 5210-2006 (Pull-off test, sandblasting treatment of stainless steel substrate);

[0073] Thermal shock stability: IEC 60068-2-14 (-40℃↔80℃ cycle, 30min each time).

[0074] The 2.5±0.5mm thickness design ensures excellent heat insulation while avoiding excessive occupation of the internal space of the stainless steel housing 3, ensuring smooth installation of the SF6 density relay body 1. The inner wall of the stainless steel housing 3 is roughened by sandblasting, creating an uneven texture that increases the contact area with the nano-aerogel insulation layer. This mechanical interlocking enhances the adhesion strength of the insulation layer, preventing detachment during long-term use and ensuring the continuity of the heat insulation effect.

[0075] The composite nano-aerogel insulation layer combines thermal insulation and structural strength, resolving the contradiction of traditional insulation materials where "good insulation comes at the cost of poor strength." With a roughness of Ra=3.2μm achieved through sandblasting, the adhesion of the 3:1 mixture reaches 15.8MPa. Sandblasting significantly improves the bonding force between the insulation layer and the stainless steel shell 3, maintaining stability even under frequent equipment vibration and reducing maintenance frequency. Precise thickness control balances insulation performance with space requirements, resulting in a more compact overall structure. The excellent temperature resistance of SiO2 aerogel and ceramic fibers allows for stable performance over a wide temperature range, adapting to different regional climates and providing continuous and reliable temperature protection for the SF6 density relay body 1, ensuring its measurement accuracy is unaffected by drastic changes in ambient temperature.

[0076] In some embodiments, the stainless steel housing 3 includes a top plate 31 located on top of the SF6 density relay body 1, two side plates 32 located on both sides of the SF6 density relay body 1 and connected to the top plate 31, a back plate 33 located on the side of the SF6 density relay body 1 away from the observation surface, and a front panel 34 located directly in front of the observation surface of the SF6 density relay body 1. The first opening 341 is opened in the front panel 34, and the two side plates 32, the back plate 33, and the side of the front panel 34 away from the top plate 31 enclose and form the second opening. An extension plate 35 extending toward the side away from the back plate 33 is provided on the top of the front panel 34.

[0077] In this embodiment, the stainless steel housing 3 is composed of a top plate 31, two side plates 32, a back plate 33, and a front panel 34, forming a closed frame surrounding the SF6 density relay body 1, blocking external environmental influences from the top, sides, back, and front. The first opening 341 is located on the front panel 34, facing the observation surface of the SF6 density relay body 1, and works with the transparent heat shield 2 to achieve the observation function; the second opening is formed by the side plates 32, the back plate 33, and the side of the front panel 34 away from the top plate 31, which not only provides a channel for the wiring connection and heat dissipation of the SF6 density relay body 1, but also facilitates equipment installation and maintenance.

[0078] The extension plate 35 at the top of the front panel 34 extends away from the back panel 33 to form a structure similar to a sunshade, which can block sunlight from shining directly onto the transparent heat insulation cover 2 and reduce the heat input from solar radiation. At the same time, the extension plate 35 can prevent rainwater from directly washing over the transparent cover, reduce the risk of rainwater infiltration, protect the internal heat insulation layer and the SF6 density relay body 1, and maintain the stability of the heat insulation system.

[0079] The multi-panel stainless steel housing 3 provides robust mechanical protection for the SF6 density relay body 1. The stainless steel material is corrosion-resistant and oxidation-resistant, making it suitable for long-term outdoor use. The reasonable placement of the openings takes into account the needs of observation, connection, and maintenance, avoiding functional conflicts. The sunshade and rain protection of the extension plate 35 further enhances the environmental adaptability of the device and reduces the impact of external climate on the internal temperature. The overall frame structure is stable, and the synergistic effect of each panel can disperse external impact forces, reducing the probability of damage to the SF6 density relay body 1 due to collisions. The design of the second opening facilitates air circulation, and together with the subsequent ventilation structure, it can enhance the heat dissipation effect, ensuring that the SF6 density relay body 1 operates at a suitable temperature and reducing the occurrence of overcompensation.

[0080] In some embodiments, both the top plate 31 and the extension plate 35 are flat plate structures, the extension plate 35 is flush with the top plate 31, and the SF6 density relay body 1 is fixed to the top of the inner wall of the stainless steel housing 3 by the first locking member 61.

[0081] In this embodiment, the top plate 31 and the extension plate 35 adopt a flat plate structure and remain flush. This design makes the top surface of the stainless steel shell 3 flat, reducing water and dust accumulation and lowering the risk of corrosion of the stainless steel shell 3 due to water accumulation. The flush structure also allows the extension plate 35 to more effectively block sunlight and rain, avoid blind spots caused by height differences, and ensure that the transparent heat insulation cover 2 and the internal heat insulation layer are not directly corroded by the external environment.

[0082] The SF6 density relay body 1 is fixed to the top of the inner wall of the stainless steel housing 3 by the first locking member 61. This fixing method suspends the SF6 density relay body 1 on the upper part of the stainless steel housing 3, reducing the contact area with the bottom of the stainless steel housing 3 and reducing the heat conducted through the stainless steel housing 3. At the same time, the strong locking structure can prevent the SF6 density relay body 1 from shifting in the vibration environment, ensuring that the observation surface is always aligned with the first opening 341, ensuring the accuracy of observation and avoiding monitoring errors caused by positional deviation.

[0083] The flat top plate and extension plate facilitate cleaning and maintenance, reducing the potential hazards caused by debris accumulation; the flush design enhances the sunshade and rain protection effect, and extends the service life of the transparent heat insulation cover 2 and the internal heat insulation layer; the fixing method of the first locking component 61 ensures the SF6 density relay body 1 is installed firmly, avoiding poor circuit contact or measurement errors caused by shaking; the gap between the SF6 density relay body 1 and the bottom of the stainless steel shell 3 can form an air convection channel to assist heat dissipation, and further optimize the internal temperature environment in conjunction with other heat insulation structures; the overall structure is simple, easy to process, suitable for mass production, reduces manufacturing costs, and improves the installation efficiency and stability of the equipment.

[0084] In some embodiments, the SF6 meter over-compensation device further includes a PTFE pressure plate 4 having a first through hole 41. The first through hole 41 has an axially oriented opening with a flared portion 42 adapted to the transparent heat insulation cover 2. The PTFE pressure plate 4 is disposed on the front panel 34, and the first opening 341 is coaxial with the first through hole 41. The transparent heat insulation cover 2 is located inside the flared portion 42, and the flared portion 42 faces the front panel 34.

[0085] In this embodiment, the PTFE pressure plate 4 has a first through hole 41 and an flared portion 42 adapted to the transparent heat insulation cover 2 on one side of the axial direction. During installation, the PTFE pressure plate 4 is fixed on the front panel 34, so that the first opening 341 is coaxial with the first through hole 41, and the transparent heat insulation cover 2 is embedded in the flared portion 42, with the flared portion 42 facing the front panel 34.

[0086] The flared portion 42 is shaped to match the transparent heat shield 2, forming a circumferential wrap around the transparent shield and preventing it from shifting horizontally. The PTFE pressure plate 4 is made of polytetrafluoroethylene, which has the characteristics of high and low temperature resistance, corrosion resistance, and low coefficient of friction. It will not deform due to temperature changes, nor will it cause wear to the transparent shield, ensuring the integrity and light transmittance of the transparent shield during long-term use. The first through hole 41 and the first opening 341 are coaxial to ensure that the line of sight is not obstructed, guaranteeing the continuity and accuracy of monitoring.

[0087] The fixing method of the PTFE pressure plate 4 ensures that the transparent heat insulation cover 2 is firmly installed and remains stable even in vibrating environments such as strong winds, preventing it from falling off or breaking. The weather resistance of the PTFE material ensures that the pressure plate has stable performance during long-term use and will not rust or age. The wrapping effect of the flared part 42 reduces the gap between the transparent cover and the front panel 34, reducing the risk of dust and moisture infiltration and protecting the internal air insulation layer and nano-insulation material layer. The coaxial design ensures that the field of view is not affected, taking into account both protection and monitoring functions, improving the practicality and reliability of the device, and reducing maintenance needs caused by loosening or damage to the transparent cover.

[0088] In some embodiments, the SF6 meter over-compensation device further includes a fixed pressure plate 5 having a second through hole 51, the second through hole 51 being coaxial with the first through hole 41, the fixed pressure plate 5 being disposed on the side of the PTFE pressure plate 4 away from the front panel 34, the fixed pressure plate 5 having a guide post 52, the guide post 52 penetrating the fixed pressure plate 5 and extending to the front panel 34, the guide post 52 being fixedly connected to the front panel 34 by a second locking member 62.

[0089] In this embodiment, the fixed pressure plate 5 has a second through hole 51, which is coaxial with the first through hole 41 of the PTFE pressure plate 4 to ensure that the observation channel is unobstructed; the fixed pressure plate 5 is located on the side of the PTFE pressure plate 4 away from the front panel 34, and its guide post 52 passes through the PTFE pressure plate 4 and extends to the front panel 34. The guide post 52 is connected to the front panel 34 through the second locking member 62.

[0090] During installation, the guide post 52 can accurately position the relative positions of the fixing plate 5 and the PTFE plate 4, ensuring that the second through hole 51 is aligned with the first through hole 41. After the second locking part 62 is tightened, the fixing plate 5 applies pressure to the PTFE plate 4, making the PTFE plate 4 fit tightly against the front panel 34, while firmly pressing the transparent heat insulation cover 2 into the flared part 42, forming a three-layer clamping structure of "front panel - PTFE plate - fixing plate", which greatly improves the installation strength of the transparent cover.

[0091] The double-plate structure significantly improves the installation strength of the transparent heat shield 2, resisting stronger external impacts and vibrations, making it suitable for windy or collision-prone installation environments. The positioning function of the guide column 52 ensures the coaxiality of each component, preventing the observation field of view from shifting or being obstructed due to installation deviations. The pressure of the fixing plate 5 is evenly distributed on the PTFE plate 4, preventing the PTFE plate 4 from deforming due to excessive local stress and extending its service life. The connection method of the second locking part 62 facilitates disassembly and maintenance. When the transparent shield needs to be replaced, simply loosen the second locking part 62 to remove the fixing plate 5 and the PTFE plate 4. The operation is simple, reducing maintenance difficulty, while ensuring the stability of the transparent shield and the reliability of the observation function during long-term use.

[0092] In some embodiments, both the top plate 31 and the extension plate 35 are arc-shaped structures and protrude toward the side away from the SF6 density relay body 1. The extension plate 35 is located on the side of the top plate 31 away from the SF6 density relay body 1. The SF6 meter over-compensation device also includes at least two spaced PTFE gaskets 71 sandwiched between the SF6 density relay body 1 and the inner wall of the stainless steel housing 3, and a crossbar 72 connected to both side plates 32. The PTFE gaskets 71 are annular structures, with the inner annular surface of the PTFE gaskets 71 fitting against the SF6 density relay body 1 and the outer annular surface of the PTFE gaskets 71 fitting against the inner wall of the stainless steel housing 3. The thickness of the PTFE gaskets 71 is 2.5 ± 0.2 mm. The crossbar 72 is connected to both side plates 32 and is located on the side of the PTFE gaskets 71 away from the top plate 31.

[0093] In this embodiment, an arc-shaped top plate 31 and extension plate 35 are adopted, and PTFE gaskets 71 and crossbars 72 are added. During operation, the protective and shock-absorbing effects of the device are improved through structural optimization. The top plate 31 and extension plate 35 protrude to the side away from the SF6 density relay body 1. The arc-shaped surface can guide rainwater to flow down quickly and reduce water accumulation. The extension plate 35 is located outside the top plate 31, further expanding the sunshade and rain protection range, reducing the impact of direct sunlight and rain on the transparent heat insulation cover 2, and maintaining stable internal temperature.

[0094] The PTFE gasket 71 is sandwiched between the main body and the inner wall of the stainless steel housing 3. Its annular structure allows it to fully enclose the sides of the SF6 density relay main body 1. The inner ring surface is in contact with the SF6 density relay main body 1, and the outer ring surface is in contact with the stainless steel housing 3. The thickness of 2.5±0.2mm can buffer the vibration transmission between the SF6 density relay main body 1 and the stainless steel housing 3. The crossbar 72 connects the two side plates 32 and is located below the PTFE gasket 71, enhancing the structural rigidity of the stainless steel housing 3, preventing the side plates 32 from deforming, and protecting the SF6 density relay main body 1 from compression.

[0095] The arc-shaped top plate and extension plate have excellent drainage, reducing the risk of corrosion caused by rainwater retention; the PTFE gasket 71 reduces the measurement error caused by vibration of the SF6 density relay body 1, and its temperature resistance and corrosion resistance ensure long-term effectiveness; the crossbar 72 enhances the overall strength of the stainless steel shell 3, preventing the side plate 32 from deforming and squeezing the SF6 density relay body 1 due to external forces; the combination of the arc-shaped structure and the annular gasket makes the device more adaptable to complex environments, extends the service life of the equipment, ensures that the measurement accuracy is not affected by external vibration and climate, and reduces the occurrence of overcompensation.

[0096] In some embodiments, the two side plates 32 are symmetrically provided with ventilation louvers, the central axis of which is aligned with the center of the heat dissipation hole of the SF6 density relay body 1, and the louver angle is 45±2°; the inner side of the ventilation louvers is covered with a dustproof nanofiber filter with a pore size of 50±5μm, and the edge of the dustproof nanofiber filter is laser welded to the frame of the ventilation louvers; a drainage groove is provided below the ventilation louvers, and the bottom of the drainage groove is 12-15mm lower than the bottom surface of the SF6 density relay body 1.

[0097] In this embodiment, the design of ventilation louvers, dustproof nano-filters, and drainage channels achieves a synergistic effect of heat dissipation, dust prevention, and waterproofing during operation. Two side panels 32 are symmetrically equipped with ventilation louvers, their central axis aligned with the heat dissipation holes of the SF6 density relay body 1. This ensures that external cold air can flow directly through the heat dissipation holes, carrying away the heat generated by the SF6 density relay body 1 during operation and maintaining a stable internal temperature. The louver angle is 45±2°, which guides air inflow while preventing rainwater from directly entering. Rainwater flows down the sloping surface of the louvers, avoiding seepage into the interior and affecting the equipment.

[0098] The dustproof nano-filter inside the ventilation louvers has a pore size of 50±5μm, which can filter sand and particulate matter in the air, preventing them from clogging the heat dissipation holes of the SF6 density relay body 1 or adhering to internal components, ensuring heat dissipation efficiency and equipment cleanliness. The filter edge is laser-welded to the louver frame to ensure a firm connection and prevent the filter from falling off and failing. The bottom of the drainage channel below the louvers is 12-15mm lower than the bottom surface of the SF6 density relay body 1, which can collect and drain any small amount of rainwater that seeps in, preventing water from contacting the SF6 density relay body 1 and avoiding moisture and corrosion. Laser welding avoids adhesive aging; the 50μm pore size balances dustproofing and air permeability (dustproof nano-filters with pore sizes smaller than 30μm are prone to clogging, while those with pore sizes larger than 70μm have insufficient dustproofing rate).

[0099] Aligned ventilation louvers and heat dissipation holes form an efficient convection channel, improving heat dissipation efficiency and preventing measurement deviations caused by overheating of the SF6 density relay body 1; the 45° inclined louvers ensure ventilation while providing rain protection, balancing heat dissipation and protection needs; the dustproof nano-filter effectively blocks impurities, reducing the frequency of equipment cleaning and maintenance; the laser-welded filter fixation method ensures that it will not loosen during long-term use, ensuring high reliability; the height design of the drainage groove can completely drain accumulated water, preventing the SF6 density relay body 1 from getting damp and corroding, improving the outdoor adaptability of the device, ensuring long-term stable operation, and reducing overcompensation problems caused by excessive temperature or moisture.

[0100] This invention also provides an installation method for the SF6 meter over-compensation device as described above, comprising:

[0101] The nano-sunscreen and heat-insulating film is attached to the side of the transparent heat insulation cover 2 away from the SF6 density relay body 1, and the nano-heat-insulating material layer is coated on the side of the transparent heat insulation cover 2 close to the SF6 density relay body 1.

[0102] The nano-aerogel insulation layer is coated onto the inner wall of the stainless steel outer shell 3;

[0103] The SF6 density relay body 1 is fixed inside the stainless steel housing 3;

[0104] The transparent heat insulation cover 2 is disposed at the first opening 341.

[0105] In this embodiment, the installation method of the SF6 meter overcompensation device ensures precise alignment of each heat insulation structure and optimal performance through standardized steps. First, a nano-sunscreen and heat-insulating film is attached to the side of the transparent heat insulation cover 2 away from the SF6 density relay body 1, while a nano-heat-insulating material layer is coated on the side closer to the SF6 density relay body 1. This step ensures that the double-sided heat insulation layer of the transparent cover is in place in advance, avoiding damage to the coating or film during subsequent installation and ensuring the integrity of the heat insulation effect.

[0106] Next, the nano-aerogel insulation layer is coated onto the inner wall of the stainless steel housing 3. At this point, the stainless steel housing 3 is in a state where the SF6 density relay body 1 is not installed, which facilitates the uniform coating of the insulation layer and ensures complete coverage of the inner wall without any missed areas. The sandblasted inner wall enhances the adhesion of the aerogel, ensuring a firm coating and preventing it from peeling off and affecting the insulation performance. Subsequently, the SF6 density relay body 1 is fixed inside the stainless steel housing 3. During fixing, it is necessary to ensure that the observation surface of the SF6 density relay body 1 is directly facing the first opening 341, reserving an accurate position for the subsequent installation of the transparent cover and ensuring normal observation function. Finally, the transparent heat insulation cover 2 is placed in the first opening 341, completing the overall assembly and ensuring that all components work together.

[0107] Step-by-step processing of the insulation layer ensures the integrity of the coating and film, avoiding operational inconvenience caused by the installation of the SF6 density relay body 1; pre-coating the nano-aerogel insulation layer ensures uniform coverage and improves the overall insulation performance of the stainless steel shell 3; the positioning steps during the fixing of the SF6 density relay body 1 ensure that the observation function is not affected and ensures monitoring accuracy; sequential installation of each component ensures precise structural fit, reduces assembly errors, ensures uniform thickness of the first air insulation layer, and avoids local insulation failure caused by uneven gaps; the standardized installation process reduces the probability of human error, is suitable for batch installation, improves construction efficiency, and ensures that each device achieves the designed insulation effect, effectively preventing overcompensation problems and improving the reliability of equipment operation.

[0108] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0109] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An SF6 meter over-compensation device, characterized in that, include: SF6 density relay body (1); The stainless steel housing (3) is provided inside the SF6 density relay body (1). The stainless steel housing (3) has a first opening (341) located in front of the observation surface of the SF6 density relay body (1) and a second opening located at the bottom of the SF6 density relay body (1). A transparent heat insulation cover (2) is provided at the first opening (341), and a first air heat insulation layer is provided between the transparent heat insulation cover (2) and the observation surface of the SF6 density relay body (1); Composite thermal insulation structures include: Nano-sunscreen and heat-insulating film covering the side of the transparent heat insulation cover (2) away from the SF6 density relay body (1), A transparent heat insulation cover (2) is placed on the side of the SF6 density relay body (1) with a nano heat insulation material layer, and a nano aerogel heat insulation layer is placed on the inner wall of the stainless steel shell (3).

2. The SF6 meter over-compensation device according to claim 1, characterized in that, The transparent heat insulation cover (2) is made of tempered glass, and the nano heat insulation material layer is made of yttrium oxide stabilized zirconium oxide nanoparticle layer. The thickness of the nano heat insulation material layer is 80-100nm, and the area of ​​the surface of the transparent heat insulation cover (2) on the side away from the SF6 density relay body (1) is not less than 95%. The nanoparticles in the nano-insulation material layer have a particle size of no more than 100 nm and a porosity of less than 5%.

3. The SF6 meter over-compensation device according to claim 1, characterized in that, The nano-aerogel insulation layer is composed of SiO2 aerogel and ceramic fiber in a mass ratio of 3:1, with a thickness of 2.5±0.5mm. The inner wall of the stainless steel shell (3) is roughened by sandblasting, and the nano-aerogel insulation layer is attached to the inner wall of the stainless steel shell (3).

4. The SF6 meter over-compensation device according to claim 1, characterized in that, The stainless steel housing (3) includes a top plate (31) located on top of the SF6 density relay body (1), two side plates (32) located on both sides of the SF6 density relay body (1) and connected to the top plate (31), a back plate (33) located on the side of the SF6 density relay body (1) away from the observation surface, and a front panel (34) located directly in front of the observation surface of the SF6 density relay body (1). The first opening (341) is opened on the front panel (34), and the two side plates (32), the back plate (33) and the front panel (34) together form the second opening by surrounding the sides away from the top plate (31). An extension plate (35) extending toward the side away from the back plate (33) is provided on the top of the front panel (34).

5. The SF6 meter over-compensation device according to claim 4, characterized in that, Both the top plate (31) and the extension plate (35) are flat plate structures. The extension plate (35) is flush with the top plate (31). The SF6 density relay body (1) is fixed to the top of the inner wall of the stainless steel shell (3) by the first locking member (61).

6. The SF6 meter over-compensation device according to claim 4, characterized in that, The SF6 meter over-compensation device further includes a PTFE pressure plate (4) with a first through hole (41). The first through hole (41) has an axial opening with a flared portion (42) adapted to the transparent heat insulation cover (2). The PTFE pressure plate (4) is located on the front panel (34), and the first opening (341) is coaxial with the first through hole (41). The transparent heat insulation cover (2) is located inside the flared portion (42), and the flared portion (42) faces the front panel (34).

7. The SF6 meter over-compensation device according to claim 6, characterized in that, The SF6 meter over-compensation device further includes a fixed pressure plate (5) with a second through hole (51), the second through hole (51) being coaxial with the first through hole (41), the fixed pressure plate (5) being disposed on the side of the PTFE pressure plate (4) away from the front panel (34), the fixed pressure plate (5) having a guide post (52), the guide post (52) penetrating the fixed pressure plate (5) and extending to the front panel (34), the guide post (52) being fixedly connected to the front panel (34) by a second locking member (62).

8. The SF6 meter over-compensation device according to claim 4, characterized in that, Both the top plate (31) and the extension plate (35) are arc-shaped structures and protrude toward the side away from the SF6 density relay body (1). The extension plate (35) is located on the side of the top plate (31) away from the SF6 density relay body (1). The SF6 meter over-compensation device also includes at least two spaced PTFE gaskets (71) sandwiched between the SF6 density relay body (1) and the inner wall of the stainless steel housing (3), and the two side plates ( 32) The crossbars (72) are connected to each other. The PTFE gasket (71) is a ring structure. The inner ring surface of the PTFE gasket (71) is attached to the SF6 density relay body (1). The outer ring surface of the PTFE gasket (71) is attached to the inner wall of the stainless steel shell (3). The thickness of the PTFE gasket (71) is 2.5±0.2mm. The crossbar (72) is connected to both side plates (32) and is located on the side of the PTFE gasket (71) away from the top plate (31).

9. The SF6 meter over-compensation device according to claim 4, characterized in that, The two side plates (32) are symmetrically provided with ventilation louvers. The central axis of the ventilation louvers is aligned with the center of the heat dissipation hole of the SF6 density relay body (1). The louver inclination angle of the ventilation louvers is 45±2°. The inner side of the ventilation louvers is covered with a dustproof nano-filter with a pore size of 50±5μm. The edge of the dustproof nano-filter is laser-welded to the frame of the ventilation louvers. A drainage groove is provided below the ventilation louvers. The bottom of the drainage groove is 12-15mm lower than the bottom surface of the SF6 density relay body (1).

10. A method for installing an SF6 meter over-compensation device as described in any one of claims 1-9, characterized in that, include: The nano sunscreen and heat insulation film is attached to the side of the transparent heat insulation cover (2) away from the SF6 density relay body (1), and the nano heat insulation material layer is coated on the side of the transparent heat insulation cover (2) close to the SF6 density relay body (1). The nano-aerogel insulation layer is coated on the inner wall of the stainless steel shell (3); The SF6 density relay body (1) is fixed inside the stainless steel housing (3); The transparent heat insulation cover (2) is disposed at the first opening (341).

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