Anti-flashover insulation sheath for voltage transformer terminal

Abstract

The utility model discloses voltage transformer wiring terminal's anti -flashover insulating sheath, specifically relates to voltage transformer technical field, including the porcelain tube of the wiring terminal conducting column outside, the outside of porcelain tube is provided with the umbrella skirt, and the both ends of porcelain tube outer wall all are provided with locking mechanism, and the inner wall of porcelain tube is provided with the function cover, and the function cover is composed of first insulating layer, first weather resistance layer and conducting layer, and first insulating layer, first weather resistance layer and conducting layer are sequentially arranged from outside to inside. The utility model discloses through setting up the function cover in the porcelain tube sheath inside, and the function cover is composed of three layers structure, can form the insulating barrier, blocks the current leakage and the whole flexibility is good, adapts the deformation of porcelain tube, reduces the risk of cracking, and can adapt to extreme temperature, avoids the corrosion of acid rain or salt fog, and can even electric field distribution, restrains partial discharge, prevents flashover, and the whole convenient with voltage transformer wiring terminal head on wiring terminal conducting column is connected.

Description

Technical Field

[0001] This utility model relates to the field of voltage transformer technology, and more specifically, to a flashover-proof insulating sleeve for voltage transformer terminals. Background Technology

[0002] Voltage transformers are core equipment used for high-voltage measurement, metering, and relay protection in power systems. Their terminals, as the hub connecting high-voltage lines and secondary equipment, directly bear the influence of system operating voltage and external environment. During long-term operation, the insulation performance of the terminals exposed to air is easily corroded by environmental factors such as pollution, humidity, salt spray, and dust, leading to a decrease in insulation strength between terminals or between terminals and grounding bodies. Especially under conditions of severe pollution or high humidity, the surface dirt layer absorbs moisture and forms conductive channels, which may cause partial discharge or even flashover, resulting in equipment insulation breakdown, malfunction, or power outage accidents, seriously threatening the safe operation of the power grid.

[0003] Traditional protective measures often involve regular cleaning, applying anti-flashover coatings, or installing ordinary insulating covers. Ordinary insulating covers are mostly made of hard plastic or rubber, which are prone to aging and cracking. In corrosive environments such as salt spray and acid rain, the materials are easily degraded. Especially in extreme climates or complex working conditions, the risk of partial discharge is relatively high, further reducing the reliability of insulation. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a flashover-proof insulating sleeve for the terminals of voltage transformers.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a flashover-proof insulating sleeve for voltage transformer terminals, comprising a ceramic tube sleeved on the outside of the conductive post of the terminal, the outside of the ceramic tube being provided with a skirt, and both ends of the ceramic tube being provided with a locking mechanism on the outer wall, the inner wall of the ceramic tube being provided with a functional sleeve, the functional sleeve being composed of a first insulating layer, a first weather-resistant layer and a conductive layer, and the first insulating layer, the first weather-resistant layer and the conductive layer being arranged sequentially from the outside to the inside.

[0006] As a further improvement to the technical solution of this utility model, the outer surface of the umbrella skirt is coated with RTV anti-flashover coating, and the coating is room temperature vulcanized silicone rubber.

[0007] As a further improvement to the technical solution of this utility model, the first insulating layer is made of silicone rubber or EPDM material, and the thickness of the first insulating layer is not less than 3mm.

[0008] As a further improvement to the technical solution of this utility model, the first weather-resistant layer is a component made of fluororubber, and the thickness of the first weather-resistant layer is not less than 3mm.

[0009] As a further improvement to the technical solution of this utility model, the conductive layer is a component made of carbon black doped silicone rubber, and the thickness of the conductive layer is 1-3mm.

[0010] As a further improvement to the technical solution of this utility model, the locking mechanism includes two symmetrically arranged arc-shaped clamps on the inner side of the end of the ceramic tube. The outer walls of the two arc-shaped clamps are connected to screws, one end of which extends to the outside of the ceramic tube. The outer walls of the arc-shaped clamps are fixedly connected to guide rods arranged parallel to the screws, one end of which extends to the outside of the ceramic tube.

[0011] As a further improvement to the technical solution of this utility model, the inner surface of the arc-shaped clamp is provided with a second insulating layer, the inner side of the second insulating layer is provided with a second weather-resistant layer, and the inner side of the second weather-resistant layer is provided with a third insulating layer. The second insulating layer and the third insulating layer are both made of silicone rubber, and the second weather-resistant layer can be made of fluororubber.

[0012] As a further improvement to the technical solution of this utility model, the outer wall of the ceramic tube is provided with an internal threaded hole at the connection point of the screw, and the outer wall of the ceramic tube is provided with a through hole at the position where the guide rod passes through, and the outer wall of the arc-shaped clamp is provided with a bearing seat at the end position of the screw.

[0013] The beneficial effects of this utility model are:

[0014] 1. The functional sleeve of this utility model consists of a first insulating layer, a first weather-resistant layer and a conductive layer. The first insulating layer can form an insulating barrier to block current leakage and has good overall flexibility, adapting to the deformation of the ceramic tube and reducing the risk of cracking. The first weather-resistant layer can adapt to extreme temperatures and avoid corrosion from acid rain or salt spray. The conductive layer can distribute the electric field evenly, suppress partial discharge, and prevent flashover.

[0015] 2. By setting a locking mechanism, it is easy to lock or loosen the conductive post of the terminal block by rotating the screw during use, so as to facilitate the connection with the conductive post of the terminal block on the voltage transformer terminal head. The second insulation layer, the second weather-resistant layer and the third insulation layer set on the inner wall of the arc-shaped clamp can ensure reliable insulation and resistance to environmental aging during clamping. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the present invention.

[0017] Figure 2 This is the front view of the present invention.

[0018] Figure 3 This is a schematic diagram of the connection structure between the present invention and the wiring terminal.

[0019] Figure 4 This utility model Figure 1 Enlarged view of part A in the middle.

[0020] Figure 5 This is a schematic diagram of the arc-shaped clamp in this utility model.

[0021] The attached figures are labeled as follows: 1. Ceramic tube; 2. Umbrella skirt; 3. First insulating layer; 4. First weather-resistant layer; 5. Conductive layer; 6. Arc-shaped clamp; 7. Screw; 8. Guide rod; 9. Bearing seat; 10. Second insulating layer; 11. Second weather-resistant layer; 12. Third insulating layer. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] As attached Figure 1-5 The voltage transformer terminal block anti-flashover insulation sleeve shown includes a ceramic tube 1 sleeved on the outside of the conductive post of the terminal block. The ceramic tube 1 is provided with a skirt 2 on the outside, and a locking mechanism is provided on the outer wall of both ends of the ceramic tube 1. The inner wall of the ceramic tube 1 is provided with a functional sleeve, which is composed of a first insulating layer 3, a first weather-resistant layer 4 and a conductive layer 5, and the first insulating layer 3, the first weather-resistant layer 4 and the conductive layer 5 are arranged sequentially from the outside to the inside.

[0024] Preferably, the outer surface of the umbrella skirt 2 is coated with an RTV anti-flashover coating, which is a room temperature vulcanizing silicone rubber that can enhance hydrophobicity and anti-fouling ability.

[0025] Preferably, the first insulating layer 3 is made of silicone rubber or EPDM material, and the thickness of the first insulating layer 3 is not less than 3mm, which can form an insulating barrier, block current leakage, and have good overall flexibility, adapt to the deformation of the ceramic tube 1, and reduce the risk of cracking.

[0026] Preferably, the first weather-resistant layer 4 can be a component made of fluororubber, and the thickness of the first weather-resistant layer 4 is not less than 3mm, so as to be able to adapt to extreme temperatures and avoid corrosion from acid rain or salt spray.

[0027] Preferably, the conductive layer 5 is a component made of carbon black-doped silicone rubber, and the thickness of the conductive layer 5 is 1-3 mm, which can uniformly distribute the electric field, suppress partial discharge, and prevent flashover.

[0028] As attached Figure 1-5As shown, the locking mechanism includes two symmetrically arranged arc-shaped clamps 6 on the inner side of the end of the ceramic tube 1. Screws 7 are connected to the outer walls of both arc-shaped clamps 6, with one end of the screw 7 extending to the outside of the ceramic tube 1. A guide rod 8, parallel to the screw 7, is fixedly connected to the outer wall of the arc-shaped clamps 6, with one end of the guide rod 8 extending to the outside of the ceramic tube 1. A second insulating layer 10 is provided on the inner surface of the arc-shaped clamps 6. A second weather-resistant layer 11 is provided inside the second insulating layer 10, and a third insulating layer 12 is provided inside the second weather-resistant layer 11. Both the second insulating layer 10 and the third insulating layer 12 are made of silicone rubber, while the second weather-resistant layer 11 is made of fluororubber. An internal threaded hole is provided on the outer wall of the ceramic tube 1 at the connection point of the screw 7, and a through hole is provided on the outer wall of the ceramic tube 1 at the insertion position of the guide rod 8. A bearing seat 9 is provided on the outer wall of the arc-shaped clamps 6 at the end position of the screw 7, facilitating the locking or loosening of the conductive post of the terminal block.

[0029] Working principle: This utility model designs an anti-flashover insulating sleeve for the terminals of a voltage transformer. The specific structure is shown in the attached instruction manual. Figure 1-5 As shown, in this technical solution, the ceramic tube 1 serves as the main insulating support structure, providing mechanical strength and basic insulation performance. The umbrella skirt 2 increases the creepage distance and prevents flashover. The surface is coated with RTV anti-flashover coating (room temperature vulcanizing silicone rubber) to enhance hydrophobicity and anti-fouling ability. The functional sleeve consists of a first insulating layer 3, a first weather-resistant layer 4, and a conductive layer 5. The first insulating layer 3 forms an insulating barrier, blocking current leakage and exhibiting good overall flexibility, adapting to the deformation of the ceramic tube 1 and reducing the risk of cracking. The first weather-resistant layer 4 can adapt to extreme temperatures, avoiding corrosion from acid rain or salt spray. The conductive layer 5 can distribute the electric field evenly, suppressing partial discharge and preventing flashover. The locking mechanism allows for locking or loosening of the terminal conductive posts by rotating the screw 7 to drive the arc-shaped clamp 6 during use, facilitating connection with the terminal conductive posts on the voltage transformer terminal head. The second insulating layer 10, the second weather-resistant layer 11, and the third insulating layer 12 on the inner wall of the arc-shaped clamp 6 ensure reliable insulation and resistance to environmental aging during clamping.

[0030] In the accompanying drawings of the embodiments disclosed in this utility model, only the structures involved in the embodiments of this utility model are shown. Other structures can be referred to with ordinary design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0031] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. The flashover-proof insulating sleeve for the terminals of a voltage transformer, characterized in that: The device includes a ceramic tube (1) that is fitted over the conductive post of the terminal block. The ceramic tube (1) is provided with a skirt (2) on its outside. Both ends of the ceramic tube (1) are provided with a locking mechanism on their outer walls. The inner wall of the ceramic tube (1) is provided with a functional sleeve. The functional sleeve is composed of a first insulating layer (3), a first weather-resistant layer (4), and a conductive layer (5). The first insulating layer (3), the first weather-resistant layer (4), and the conductive layer (5) are arranged sequentially from the outside to the inside.

2. The anti-flashover insulating sleeve for the voltage transformer terminals according to claim 1, characterized in that: The outer surface of the umbrella skirt (2) is coated with RTV anti-flashover coating, which is room temperature vulcanized silicone rubber.

3. The anti-flashover insulating sleeve for the voltage transformer terminals according to claim 1, characterized in that: The first insulating layer (3) is made of silicone rubber or EPDM material, and the thickness of the first insulating layer (3) is not less than 3mm.

4. The anti-flashover insulating sleeve for the voltage transformer terminals according to claim 1, characterized in that: The first weather-resistant layer (4) is a component made of fluororubber, and the thickness of the first weather-resistant layer (4) is not less than 3mm.

5. The anti-flashover insulating sleeve for the voltage transformer terminals according to claim 1, characterized in that: The conductive layer (5) is a component made of carbon black doped silicone rubber, and the thickness of the conductive layer (5) is 1-3 mm.

6. The anti-flashover insulating sleeve for the voltage transformer terminals according to claim 1, characterized in that: The locking mechanism includes two symmetrically arranged arc-shaped clamps (6) on the inner side of the end of the ceramic tube (1). The outer walls of the two arc-shaped clamps (6) are connected to screws (7). One end of the screws (7) extends to the outside of the ceramic tube (1). The outer wall of the arc-shaped clamps (6) is fixedly connected to a guide rod (8) arranged parallel to the screws (7). One end of the guide rod (8) extends to the outside of the ceramic tube (1).

7. The flashover-proof insulating sleeve for the voltage transformer terminals according to claim 6, characterized in that: The inner surface of the arc-shaped clamp (6) is provided with a second insulating layer (10), the inner side of the second insulating layer (10) is provided with a second weather-resistant layer (11), the inner side of the second weather-resistant layer (11) is provided with a third insulating layer (12), the second insulating layer (10) and the third insulating layer (12) are both made of silicone rubber, and the second weather-resistant layer (11) can be made of fluororubber.

8. The anti-flashover insulating sleeve for the voltage transformer terminals according to claim 6, characterized in that: The outer wall of the ceramic tube (1) is provided with an internal threaded hole at the connection point of the screw (7), and the outer wall of the ceramic tube (1) is provided with a through hole at the position where the guide rod (8) passes through. The outer wall of the arc-shaped clamp (6) is provided with a bearing seat (9) at the end position of the screw (7).

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