High voltage potential transformer

Abstract

The high-creeper voltage transformer comprises an epoxy insulator and a shell, the shell is sleeved on the epoxy insulator, a first umbrella skirt is arranged at the sleeve of the high-voltage end of the shell, and a second umbrella skirt is arranged at the low-voltage end of the shell, the first umbrella skirt is made of silicon rubber, and self-repairing capsules are arranged at positions, which are not more than 2 mm away from the surface, in the interiors of the first umbrella skirt and the second umbrella skirt, the self-repairing capsules comprise a capsule body, the capsule body contains a curing agent, the capsule body is a plastic film capsule body, the self-repairing capsules in the first umbrella skirt adopt a combined structure integrally formed with the first umbrella skirt, and the curing agent in the capsule body is a curing agent mixed with a volatile conductive solvent. Through the self-repairing capsules and the carbon nanotube heating film, after the sensor senses local discharge, the produced cracks and conductive channels can be repaired, further damage can be avoided, and the safety and stability are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to voltage transformers. Background Technology

[0002] Voltage transformers are classified into four types according to their insulation medium: dry-type, cast-resin type, oil-immersed type, and gas-insulated type. The insulation structure of voltage transformers varies depending on the voltage level and the operating environment. Low-voltage transformers specifically designed for measurement are typically dry-type, as are high-voltage or ultra-high-voltage sealed gas-insulated transformers. Cast-resin type transformers are suitable for voltage transformers of 35kV and below, while those above 35kV are all oil-immersed. Among these, epoxy resin cast-resin transformers offer advantages such as being oil-free, gas-free, shell-less, maintenance-free for life, and having excellent insulation performance, making them one of the most widely used transformer types worldwide.

[0003] The umbrella skirt is a common structure on voltage transformers. Its corrugated structure significantly increases the surface creepage distance and reduces the risk of flashover. The inclined design reduces the accumulation of dust and salt spray and makes it easier to self-clean when washed by rain. However, in switch cabinets, the overall height of the voltage transformer must be adapted to the size of the switch cabinet. Therefore, the creepage distance cannot be simply increased. During operation, small but stable surface partial discharges cause carbonization channels or electrical erosion damage to the composite umbrella skirt and sheath. When carbonization channels are formed in the umbrella skirt, its service life will be greatly reduced, or it may even be broken down in a short period of time, posing certain safety hazards. Utility Model Content

[0004] The purpose of this invention is to provide a high creepage distance voltage transformer to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A high creepage distance voltage transformer includes an epoxy resin insulator and a housing. The housing is fitted onto the epoxy resin insulator. A first shed is provided at the bushing of the high voltage end of the housing, and a second shed is provided at the low voltage end of the housing. The first shed has at least five layers and the second shed has at least three layers.

[0007] The spacing between adjacent first umbrella skirts is smaller than the spacing between adjacent second umbrella skirts;

[0008] The first umbrella skirt is made of silicone rubber.

[0009] The second umbrella skirt is made of silicone rubber.

[0010] Self-healing capsules are spaced apart inside the first and second umbrella skirts at a position no more than 2 mm from the surface.

[0011] The self-healing capsule includes a capsule body containing a curing agent.

[0012] The capsule is made of a plastic film capsule;

[0013] The self-healing capsule in the first umbrella skirt adopts a combined structure integrally cast with the first umbrella skirt;

[0014] The self-healing capsule in the second umbrella skirt adopts a combined structure integrally cast with the second umbrella skirt;

[0015] The curing agent inside the capsule is a curing agent mixed with a volatile conductive solvent.

[0016] By adopting the above technical solution, increasing the spacing density of the umbrella skirts can effectively improve the creepage distance when the overall height is limited.

[0017] During the casting process, the silicone rubber is vulcanized at room temperature, and a self-healing capsule is placed inside the silicone rubber. The temperature at which the plastic film capsule ruptures due to thermal expansion is far higher than room temperature, but within the tolerance range of the epoxy resin. The self-healing capsule can repair the damaged area without replacing the entire capsule. When the inside or surface of the silicone rubber cracks, it will also cause the self-healing capsule at the crack to tear, and the curing agent mixed with conductive solvent inside the capsule will flow out accordingly.

[0018] The specific working mechanism is as follows:

[0019] When the surfaces of the first and second umbrella skirts are damaged, the capsule tears, exposing the hardener, and the self-healing capsule initiates repair. The hardener can be a volatile organic solvent. It resists weathering or impact.

[0020] During the use of ordinary voltage transformers, the inside or surface of the sheds may form carbonized conductive channels due to electrical erosion—partial discharge or electric arc, which eventually leads to insulation failure. In such cases, the sheds often need to be completely replaced.

[0021] This solution uses a curing agent mixed with a volatile conductive solvent, and the penetration depth is very shallow. It will be pre-broken down, releasing the curing agent through heat generated during conduction. This eliminates electrical corrosion and avoids the need for complete replacement of the umbrella skirt.

[0022] The curing agent with conductive solvent disrupts the existing conductive pathways. On the other hand, the high fluidity of the solvent also allows the curing agent to penetrate deep into the interior of the microcracks, ensuring that the repair material covers the entire defect area. After the solvent evaporates, the curing agent remains inside the crack and cross-links and cures, avoiding residual conductivity. At the same time, the curing agent forms a new insulator after curing, physically blocking crack extension and discharge channels. The cured product can also further enhance the umbrella skirt structure, restore mechanical strength, and quickly fill the damaged umbrella skirt part. This allows for early treatment before a power grid accident occurs, thus avoiding greater losses.

[0023] In a further embodiment, a monitoring system is also included, which includes at least two carbon nanotube heating films and multiple ultrasonic sensors for monitoring the first and second skirts.

[0024] The ultrasonic sensor is connected to a microprocessor system;

[0025] The microprocessor system is connected to a carbon nanotube heating film, which is disposed between the first umbrella skirt and the epoxy resin insulator.

[0026] The microprocessor system is also connected to another carbon nanotube heating film, which is disposed between the second umbrella skirt and the epoxy resin insulator.

[0027] Multiple ultrasonic sensors are spaced apart on the outer surfaces of the first and second umbrella skirts;

[0028] The microprocessor system is also connected to a wireless communication module;

[0029] The microprocessor system is wirelessly connected to a cloud service platform via a wireless communication module.

[0030] The cloud service platform includes another wireless communication module that is compatible with the wireless communication module.

[0031] The cloud service platform is wirelessly connected to a terminal via another wireless communication module.

[0032] By adopting the above technical solution, real-time monitoring and repair of the insulation status of the voltage transformer skirt is realized. The ultrasonic sensor can accurately detect the tiny cracks or carbonized channels caused by partial discharge on the surface and inside of the skirt, and transmit the data to the microprocessor system in real time. When an abnormality is detected, the microprocessor system sends an early warning message to the cloud service platform through the wireless communication module. Maintenance personnel can remotely monitor the equipment status through the terminal. At the same time, due to the carbon nanotube heating film, the damaged part and the material in the self-healing capsule cross-link, activating the material in the original damaged part, so that it can quickly participate in the vulcanization treatment of the repair adhesive, so that the materials on both sides of the contact surface undergo vulcanization reaction, improving the overall strength of the repaired skirt. The mixed curing agent released after the self-healing capsule is ruptured by heat can effectively fill the defective part, and the volatile conductive solvent can accelerate the cross-linking reaction, so that the repaired area can quickly restore the insulation strength.

[0033] In a further embodiment, both the wireless communication module and the other wireless communication module are LoRa modules.

[0034] By adopting the above technical solutions, LoRa modules are long-distance, low-power wide-area network communication technologies designed specifically for IoT devices. They are particularly suitable for low data rate scenarios and can achieve an ultra-long communication distance of 10-20km in suburban or rural environments. The battery life can reach ten years. They adopt a sleep mode and only wake up periodically. The data packets are small and the transmission time is short. At the same time, they have strong anti-interference capabilities and can cope with strong electromagnetic noise around high-voltage equipment.

[0035] In a further embodiment, the ultrasonic sensor disposed on the first umbrella skirt includes a piezoelectric element, a pre-amplifier circuit, and a sealed housing;

[0036] Both the piezoelectric element and the pre-amplifier circuit are housed within a sealed housing.

[0037] One side of the sealed housing is the coupling surface, which is in close contact with the surface of the first umbrella skirt.

[0038] By adopting the above technical solution, partial discharge generates ultrasonic signals. These minute discharge phenomena can be accurately captured by ultrasonic sensors. Piezoelectric elements can convert mechanical vibrations into electrical signals, while the pre-amplifier circuit amplifies and filters the signals to improve detection sensitivity. The sealed housing not only protects the internal components from environmental influences but also ensures that the ultrasonic signals are efficiently transmitted to the junction of the skirt and the outer shell through the coupling surface, avoiding signal attenuation. This design enables the sensor to monitor the insulation status of the skirt in real time, detect partial discharge or carbonization risks in a timely manner, and provide reliable support for subsequent self-repair.

[0039] In a further embodiment, the spacing between the umbrellas of the first umbrella skirt is 15-18 mm, and the spacing between the umbrellas of the second umbrella skirt is 18-22 mm.

[0040] By adopting the above technical solution and differentiating the spacing of the umbrellas, the balance between creepage distance and space utilization is optimized. The spacing of the first umbrella on the high-voltage side is smaller, which can significantly increase the creepage distance per unit height, thereby improving the flashover resistance. The spacing of the second umbrella on the low-voltage side is slightly larger, which takes into account the needs of heat dissipation and self-cleaning. This design maximizes the insulation performance within the limited height of the switchgear, while avoiding dust accumulation or poor heat dissipation caused by overly dense umbrellas. This spacing range can meet the insulation requirements of voltage levels from 10kV to 35kV and is also suitable for the compact installation environment of the switchgear.

[0041] In a further embodiment, the edges of both the first and second umbrella skirts are sharp, angular structures.

[0042] By adopting the above technical solution, the sharp angular edges can disrupt the continuous adhesion of water droplets or dirt to the surface of the umbrella skirt, reducing the formation of a conductive layer on the surface. Compared with smooth edges, the angular structure can force rainwater or condensation to drip off quickly instead of spreading along the edge of the umbrella skirt, thereby reducing the risk of surface leakage current. In addition, the angular design can also promote the shedding of accumulated dust under the action of wind or vibration, enhancing the self-cleaning effect. This structure is especially suitable for harsh environments such as dust and salt spray, and can extend the maintenance cycle of the umbrella skirt.

[0043] In a further embodiment, the radius of curvature of the angular structure is 2 to 5 mm.

[0044] By adopting the above technical solution, the radius of curvature is controlled within the range of 2 to 5 mm, which ensures the sharpness of the edge to optimize the self-cleaning performance, while avoiding the decrease in mechanical strength or manufacturing difficulties caused by excessive sharpness. A smaller radius of curvature is suitable for indoor environments with less dirt, while a larger radius is more suitable for outdoor or dusty scenarios. This range balances the requirements for resistance to electrical corrosion and impact resistance. In this solution, a radius of curvature of 2 mm is selected, which can effectively suppress the reduction of the partial discharge initiation voltage.

[0045] In a further embodiment, the self-healing capsule ruptures at a temperature greater than 100°C.

[0046] By adopting the above technical solution, the rupture temperature of the self-healing capsule is set above 100℃, ensuring its stability during normal operation. The repair agent is released only when actively triggered by the carbon nanotube heating film. This temperature threshold is much higher than the ambient temperature, avoiding false triggering. At the same time, the heat resistance of the silicone rubber skirt allows for short-term heating to 100℃~120℃ without affecting the overall performance. After the capsule ruptures, the repair agent mixes with the curing agent and quickly fills the rupture site. Subsequently, vulcanization crosslinking is completed under heating conditions. The repair time can be controlled within a few minutes, significantly shortening the fault handling cycle.

[0047] In summary, this utility model has the following beneficial effects:

[0048] 1. By setting differentiated umbrella skirt spacing and sharp edges, a denser first umbrella skirt can be used at the high-voltage end and a slightly sparser second umbrella skirt at the low-voltage end. This maximizes the creepage distance within a limited space, effectively suppressing the risk of flashover. At the same time, the sharp angular structure of the umbrella skirt edges disrupts the continuous adhesion of water droplets and dirt, reduces surface leakage current, and enhances the self-cleaning effect of rainwater rinsing and wind. This combined design is particularly suitable for high humidity, dusty, or salt spray environments. It can improve withstand voltage, reduce maintenance requirements, extend equipment service life, and significantly improve insulation performance and self-cleaning ability.

[0049] 2. By incorporating self-healing capsules and a microprocessor system, temperature-sensitive self-healing capsules can be embedded within the umbrella skirt, along with a carbon nanotube heating film and a partial discharge sensor. When the sensor detects a risk of partial discharge or carbonization, the microprocessor system triggers the heating network, causing the capsules to rupture and release repair and curing agents. These quickly fill the damaged areas, and the heating environment further promotes the vulcanization and cross-linking of the repair materials, restoring the mechanical strength and insulation properties of the repaired umbrella skirt. This technology can automatically repair damage in its early stages, preventing accidents caused by insulation failure, significantly reducing maintenance costs and safety risks, and achieving the effect of fault early warning and proactive repair.

[0050] 3. By using ultrasonic sensors and carbon nanotube heating films, highly sensitive ultrasonic detection technology can be employed. Through piezoelectric elements and a sealed housing design, stable signal transmission is ensured, and the insulation status of the shed is monitored in real time. Once an anomaly is detected, the system can accurately locate the damaged area and use the carbon nanotube heating film to directionally raise the temperature, avoiding overall overheating that could affect the equipment's lifespan. This intelligent monitoring-repair closed-loop system not only improves fault response speed but also reduces unnecessary energy consumption, enabling the voltage transformer to maintain high reliability under complex operating conditions and optimizing monitoring and repair efficiency. Attached Figure Description

[0051] Figure 1 This is an overall schematic diagram of the high creepage voltage transformer of this utility model;

[0052] Figure 2 This is a partial schematic diagram (A) of the internal structure of the umbrella skirt in the high creepage voltage transformer of this utility model.

[0053] In the diagram, 1 is the outer shell; 2 is the first umbrella skirt; 3 is the second umbrella skirt; and 4 is the self-healing capsule. Detailed Implementation

[0054] The present invention will be further described in detail below with reference to the accompanying drawings.

[0055] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0056] like Figures 1-2 As shown, a high creepage distance voltage transformer includes an epoxy resin insulator and a housing 1. The housing 1 is fitted onto the epoxy resin insulator. A first shed 2 is provided at the bushing of the high-voltage end of the housing 1, and a second shed 3 is provided at the low-voltage end of the housing 1. At least five layers of the first shed 2 and at least three layers of the second shed 3 are provided. The spacing between adjacent first shed 2 is smaller than the spacing between adjacent second shed 3. The first shed 2 is made of silicone rubber, and the second shed 3 is made of silicone rubber. Self-healing capsules 4 are spaced apart at intervals within 2 mm of the surface of the first shed 2 and the second shed 3. Each self-healing capsule 4 includes a capsule body containing a curing agent. The capsule body is a plastic film capsule body. The self-healing capsules 4 in the first shed 2 are integrally cast with the first shed 2, and the self-healing capsules 4 in the second shed 3 are integrally cast with the second shed 3. The curing agent inside the capsule body is a curing agent mixed with a volatile conductive solvent.

[0057] By adopting the above technical solution, increasing the spacing density of the umbrella skirts can effectively improve the creepage distance when the overall height is limited.

[0058] During the casting process, the silicone rubber is vulcanized at room temperature, and a self-healing capsule 4 is placed inside the silicone rubber. The temperature at which the plastic film capsule ruptures due to thermal expansion is far higher than room temperature, but within the tolerance range of the epoxy resin, the self-healing capsule 4 can repair the damaged area without replacing the entire capsule. When the inside or surface of the silicone rubber cracks, it will also cause the self-healing capsule 4 at the crack location to tear, and the curing agent mixed with conductive solvent inside the capsule will flow out accordingly.

[0059] The specific working mechanism is as follows:

[0060] When the surfaces of the first umbrella skirt 2 and the second umbrella skirt 3 are damaged, the capsule tears, exposing the hardener, and the self-healing capsule 4 initiates repair. The hardener can be a volatile organic solvent. It resists weathering or impact.

[0061] During the use of ordinary voltage transformers, the inside or surface of the sheds may form carbonized conductive channels due to electrical erosion—partial discharge or electric arc, which eventually leads to insulation failure. In such cases, the sheds often need to be completely replaced.

[0062] This solution uses a curing agent mixed with a volatile conductive solvent, and the penetration depth is very shallow. It will be pre-broken down, releasing the curing agent through heat generated during conduction. This eliminates electrical corrosion and avoids the need for complete replacement of the umbrella skirt.

[0063] The curing agent with conductive solvent disrupts the existing conductive pathways. On the other hand, the high fluidity of the solvent also allows the curing agent to penetrate deep into the interior of the microcracks, ensuring that the repair material covers the entire defect area. After the solvent evaporates, the curing agent remains inside the crack and cross-links and cures, avoiding residual conductivity. At the same time, the curing agent forms a new insulator after curing, physically blocking crack extension and discharge channels. The cured product can also further enhance the umbrella skirt structure, restore mechanical strength, and quickly fill the damaged umbrella skirt part. This allows for early treatment before a power grid accident occurs, thus avoiding greater losses.

[0064] In a further embodiment, a monitoring system is also included. The monitoring system includes at least two carbon nanotube heating films and multiple ultrasonic sensors for monitoring the first umbrella skirt 2 and the second umbrella skirt 3. The ultrasonic sensors are connected to a microprocessor system, which is connected to the carbon nanotube heating films. The carbon nanotube heating films are disposed between the first umbrella skirt 2 and the epoxy resin insulator. The microprocessor system is also connected to another carbon nanotube heating film, which is disposed between the second umbrella skirt 3 and the epoxy resin insulator. The multiple ultrasonic sensors are spaced apart on the outer surfaces of the first umbrella skirt 2 and the second umbrella skirt 3. The microprocessor system is also connected to a wireless communication module. The microprocessor system is wirelessly connected to a cloud service platform through the wireless communication module. The cloud service platform includes another wireless communication module that matches the wireless communication module. The cloud service platform is wirelessly connected to a terminal through the other wireless communication module.

[0065] By adopting the above technical solution, real-time monitoring and repair of the insulation status of the voltage transformer skirt is realized. The ultrasonic sensor can accurately detect the tiny cracks or carbonized channels caused by partial discharge on the surface and inside of the skirt, and transmit the data to the microprocessor system in real time. When an abnormality is detected, the microprocessor system sends an early warning message to the cloud service platform through the wireless communication module. Maintenance personnel can remotely monitor the equipment status through the terminal. At the same time, due to the carbon nanotube heating film, the damaged part and the material in the self-healing capsule 4 cross-link, activating the material in the original damaged part, so that it can quickly participate in the vulcanization treatment of the repair adhesive, so that the materials on both sides of the contact surface undergo vulcanization reaction, improving the overall strength of the repaired skirt. The mixed curing agent released after the self-healing capsule 4 is ruptured by heat can effectively fill the defective part, and the volatile conductive solvent can accelerate the cross-linking reaction, so that the repaired area can quickly restore the insulation strength.

[0066] In a further embodiment, both the wireless communication module and the other wireless communication module are LoRa modules.

[0067] By adopting the above technical solutions, LoRa modules are long-distance, low-power wide-area network communication technologies designed specifically for IoT devices. They are particularly suitable for low data rate scenarios and can achieve an ultra-long communication distance of 10-20km in suburban or rural environments. The battery life can reach ten years. They adopt a sleep mode and only wake up periodically. The data packets are small and the transmission time is short. At the same time, they have strong anti-interference capabilities and can cope with strong electromagnetic noise around high-voltage equipment.

[0068] In a further embodiment, the ultrasonic sensor disposed on the first umbrella skirt 2 includes a piezoelectric element, a pre-amplifier circuit, and a sealed housing. The piezoelectric element and the pre-amplifier circuit are both disposed inside the sealed housing. One side of the sealed housing is a coupling surface, which is in close contact with the surface of the first umbrella skirt 2.

[0069] By adopting the above technical solution, partial discharge generates ultrasonic signals. These tiny discharge phenomena can be accurately captured by ultrasonic sensors. Piezoelectric elements can convert mechanical vibrations into electrical signals, while the pre-amplifier circuit performs preliminary amplification and filtering of the signals to improve detection sensitivity. The sealed housing not only protects the internal components from environmental influences but also ensures that the ultrasonic signals are efficiently transmitted to the junction of the umbrella skirt and the outer shell 1 through the coupling surface, avoiding signal attenuation. This design enables the sensor to monitor the insulation status of the umbrella skirt in real time, promptly detect partial discharge or carbonization risks, and provide reliable support for subsequent self-repair.

[0070] In a further embodiment, the distance between the umbrellas of the first umbrella skirt 2 is 15-18 mm, and the distance between the umbrellas of the second umbrella skirt 3 is 18-22 mm.

[0071] By adopting the above technical solution and differentiating the spacing of the umbrellas, the balance between creepage distance and space utilization is optimized. The spacing of the first umbrella 2 on the high-voltage side is smaller, which can significantly increase the creepage distance per unit height, thereby improving the resistance to flashover. The spacing of the second umbrella 3 on the low-voltage side is slightly larger, which takes into account the needs of heat dissipation and self-cleaning. This design maximizes the insulation performance within the limited height of the switchgear, while avoiding dust accumulation or poor heat dissipation caused by overly dense umbrellas. This spacing range can meet the insulation requirements of voltage levels from 10kV to 35kV and is also suitable for the compact installation environment of the switchgear.

[0072] In a further embodiment, the edges of both the first umbrella skirt 2 and the second umbrella skirt 3 are sharp angular structures.

[0073] By adopting the above technical solution, the sharp angular edges can disrupt the continuous adhesion of water droplets or dirt to the surface of the umbrella skirt, reducing the formation of a conductive layer on the surface. Compared with smooth edges, the angular structure can force rainwater or condensation to drip off quickly instead of spreading along the edge of the umbrella skirt, thereby reducing the risk of surface leakage current. In addition, the angular design can also promote the shedding of accumulated dust under the action of wind or vibration, enhancing the self-cleaning effect. This structure is especially suitable for harsh environments such as dust and salt spray, and can extend the maintenance cycle of the umbrella skirt.

[0074] In a further embodiment, the radius of curvature of the angular structure is 2 to 5 mm.

[0075] By adopting the above technical solution, the radius of curvature is controlled within the range of 2 to 5 mm, which ensures the sharpness of the edge to optimize the self-cleaning performance, while avoiding the decrease in mechanical strength or manufacturing difficulties caused by excessive sharpness. A smaller radius of curvature is suitable for indoor environments with less dirt, while a larger radius is more suitable for outdoor or dusty scenarios. This range balances the requirements for resistance to electrical corrosion and impact resistance. In this solution, a radius of curvature of 2 mm is selected, which can effectively suppress the reduction of the partial discharge initiation voltage.

[0076] In a further embodiment, the self-healing capsule ruptures at a temperature greater than 100°C.

[0077] By adopting the above technical solution, the rupture temperature of the self-healing capsule 4 is set above 100℃, ensuring its stability during normal operation and releasing the repair agent only when actively triggered by the carbon nanotube heating film. This temperature threshold is much higher than the ambient temperature, avoiding false triggering. At the same time, the heat resistance of the silicone rubber umbrella skirt allows for short-term heating to 100℃~120℃ without affecting the overall performance. After the capsule ruptures, the repair agent mixes with the curing agent and quickly fills the rupture site, followed by vulcanization cross-linking under heating conditions. The repair time can be controlled within a few minutes, significantly shortening the fault handling cycle.

[0078] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0079] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A high creepage distance voltage transformer, comprising an epoxy resin insulator and a housing (1), the housing (1) being fitted onto the epoxy resin insulator, a first shed (2) being provided at the bushing of the high voltage end of the housing (1), and a second shed (3) being provided at the low voltage end of the housing (1), characterized in that: The first umbrella skirt (2) is provided with at least five layers and the second umbrella skirt (3) is provided with at least three layers; The spacing between adjacent first umbrella skirts (2) is smaller than the spacing between adjacent second umbrella skirts (3); The first umbrella skirt (2) is made of silicone rubber. The second umbrella skirt (3) is made of silicone rubber. Self-healing capsules (4) are arranged at intervals within 2 mm of the surface of the first umbrella skirt (2) and the second umbrella skirt (3); The self-healing capsule (4) includes a capsule body containing a curing agent; The capsule is made of a plastic film capsule; The self-healing capsule (4) in the first umbrella skirt (2) adopts a combined structure that is integrally cast with the first umbrella skirt (2); The self-healing capsule (4) in the second umbrella skirt (3) adopts a combined structure integrally cast with the second umbrella skirt (3); The curing agent inside the capsule is a curing agent mixed with a volatile conductive solvent.

2. The high creep voltage transformer of claim 1, wherein: The distance between the umbrellas of the first umbrella skirt (2) is 15-18 mm, and the distance between the umbrellas of the second umbrella skirt (3) is 18-22 mm.

3. The high creep voltage transformer of claim 2, wherein: The edges of the first umbrella skirt (2) and the second umbrella skirt (3) are both sharp angular structures.

4. The high creep voltage transformer of claim 3, wherein: The radius of curvature of the angular structure is 2 to 5 mm.

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