WO2021238800A1

WO2021238800A1 - Post insulator and manufacturing method therefor, and transmission tower

Info

Publication number: WO2021238800A1
Application number: PCT/CN2021/095211
Authority: WO
Inventors: 马斌; 黄清; 郁杰
Original assignee: 江苏神马电力股份有限公司
Priority date: 2020-05-25
Filing date: 2021-05-21
Publication date: 2021-12-02
Also published as: CN111540550A

Abstract

Specifically disclosed in the present application are a post insulator and a manufacturing method therefor. The post insulator comprises a post insulator body and an insulating sheath; the post insulator body comprises a first end used for connecting an electricity pylon and a free end opposite to the first end; and the free end is wrapped by the insulating sheath. By wrapping the free end by the insulating sheath, the use of an armour clamp structure for the free end can be avoided, thereby avoiding the possible occurrence of a floating potential and partial discharge of a metal component on the free end in high-voltage field strength, and preventing the rapid aging and even insulation failure of the product. In addition, by wrapping the free end by the insulating sheath, the occurrence of friction with wires and damage to the wires can be avoided. Also disclosed in the present application is a transmission tower.

Description

Pillar insulator, preparation method thereof, and power transmission tower

Technical field

This application relates to the technical field of power transmission insulation equipment, in particular to a pillar insulator and a preparation method thereof, and a power transmission tower.

Background technique

At present, wind-proof insulators mainly use line composite insulators with smaller specifications, and the line composite insulators need to be connected to the wires, so the wind-proof insulators must be installed and modified after power failure. At the same time, under extreme typhoon and other conditions, the line composite insulator may be subject to the risk of excessive deflection or breaking after the wire is acted on by the excessive wind angle due to the specification limitation. In addition, the high-voltage end of the existing wind-proof insulator adopts a metal structure. The metal parts of the high-voltage end of the high-voltage field may generate floating potential and partial discharge, which may cause rapid aging of the product or even insulation failure. In addition, the high-voltage end of the existing wind-proof insulator is made of metal parts. There is a risk of rubbing against the wire and damaging the wire.

Summary of the invention

The present application provides a post insulator and a preparation method thereof, which can solve the problem that the high-voltage end of the existing wind-proof bias insulator may generate a floating potential and a partial discharge phenomenon.

In order to solve the above technical problems, a technical solution adopted in this application is to provide a post insulator, including: a post insulator body, including a first end for connecting an iron tower and a free end opposite to the first end; an insulating sheath, a package On the free end.

According to an embodiment of the present application, the insulating sheath is cup-shaped, and the insulating sheath is buckled at the free end, which has a simple structure and is easy to install.

According to an embodiment of the present application, the pillar insulator body includes a core rod and an insulating umbrella skirt wrapped around the core rod. The insulating umbrella skirts on the outside of the insulator body are seamlessly connected to ensure the sealing of the joints and prevent the degradation of insulation performance caused by the penetration of water vapor.

According to an embodiment of the present application, the outer wall of the open end of the insulating sheath has an inclined surface that is inclined toward the pillar insulator body, and a connecting groove is formed between the inclined surface and the end surface of the insulating umbrella skirt.

According to an embodiment of the present application, the connecting groove is filled with high-temperature vulcanized silicone rubber.

According to an embodiment of the present application, a connecting layer is provided between the insulating sheath and the post insulator body, and the connecting layer is respectively adhered to the insulating sheath and the post insulator body.

According to one embodiment of the present application, the insulating sheath adopts high temperature vulcanized silicone rubber, which has excellent aging resistance, and the connecting layer adopts room temperature vulcanized silicone rubber, which is easy to operate and has good bonding performance.

According to an embodiment of the present application, the first end is connected with an end fitting for connecting the iron tower, and the end fitting includes: a sleeve sleeved and fixed to the first end; U-shaped groove, the flat plate is fixed to the end of the sleeve through the U-shaped groove; the reinforcing rib is located in the space formed by the surface of the flat plate and the end surface of the sleeve, one side of the reinforcing rib is fixed on the surface of the flat plate, and the other side It is fixedly arranged on the end surface of the sleeve.

In order to solve the above technical problem, another technical solution adopted in this application is to provide a method for preparing a post insulator, the method includes the following steps: forming a cup-shaped insulating sheath, and the insulating sheath is matched with the free end of the post insulator body; Coat the inner wall of the insulating sheath with room temperature vulcanized silicone rubber; buckle the insulating sheath coated with room temperature vulcanized silicone rubber on the free end, and wait for the room temperature vulcanized silicone rubber to cure; the outer wall of the open end of the insulating sheath has an inward slope The connecting groove is formed between the inclined surface and the end surface of the insulating umbrella skirt outside the pillar insulator, and the silicone rubber compound is filled in the connecting groove; the silicone rubber compound in the connecting groove is heated and pressurized to cure to form high temperature vulcanization Silicone rubber to prepare post insulators.

According to an embodiment of the present application, the cured high-temperature vulcanized silicone rubber at the connecting groove is polished.

The application also provides a power transmission tower. The power transmission tower adopts the above-mentioned post insulator, and at least one post insulator is provided on the power transmission tower.

According to an embodiment of the present application, there are at least two pillar insulators, and they are symmetrically arranged on both sides of the power transmission tower to prevent the wires from approaching the power transmission tower.

The beneficial effect of the present application is: different from the prior art, by wrapping the free end with an insulating sheath, it is possible to prevent the free end from adopting a fitting structure, thereby avoiding the occurrence of high-voltage field strength of the metal parts at the free end that may generate floating potential and partial discharge This phenomenon prevents rapid aging of the product and even insulation failure. In addition, if the free end of the post insulator body is made of metal parts, there is a risk of rubbing against the wire and damaging the wire. In this application, an insulating sheath is used to wrap the free end to avoid friction and damage to the wire. In addition, this application uses post insulators instead of traditional line insulators as wind-proof insulators. The traditional line insulators are relatively small in diameter and cannot withstand large bending resistance. They need to be directly connected to the wire to block the wind deviation. When the wind deflection angle is too large, the wire may cause excessive deflection or breakage after acting on the line insulator. When the post insulator is used as the wind deflection insulator, the post insulator has a large diameter and good bending resistance, so there is no need to The wires are directly connected, so that when the power grid is live, it can be installed or modified directly on the tower without power cut operation.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present application more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

FIG. 1 is a schematic diagram of a three-dimensional structure of an embodiment of a post insulator of the present application;

2 is a schematic cross-sectional view of an embodiment of the post insulator of the present application;

Fig. 3 is a schematic diagram of an enlarged structure of part A in Fig. 2;

4 is a partial structural diagram of an embodiment of the post insulator of the present application;

Fig. 5 is a schematic flow chart of the method for preparing the post insulator of the present application;

Fig. 6 is a schematic diagram of a three-dimensional structure of an embodiment of the power transmission tower of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Please refer to FIGS. 1 to 4. FIG. 1 is a three-dimensional structure diagram of an embodiment of the post insulator of the present application; FIG. 2 is a cross-sectional structure diagram of an embodiment of the post insulator of the present application; FIG. 3 is A in FIG. 2 Partial enlarged schematic diagram of the structure; FIG. 4 is a partial schematic diagram of an embodiment of the post insulator of the present application.

An embodiment of the present application provides a post insulator 100, as shown in FIG. 1, including a post insulator body 110 and an insulating sheath 120. Wherein, the post insulator body 110 includes a first end 111 for connecting the iron tower 10 (only a part of the iron tower 10 is shown in FIG. 1) and a free end 112 opposite to the first end 111, and an insulating sheath 120 is wrapped around the free end. 112.

Specifically, a suspension insulator is hung on the outer end of the iron cross arm of the existing iron tower 10, and the lower end of the suspension insulator is connected to a power transmission wire. Under the action of external forces such as strong wind, the wire will swing by wind. The post insulator 100 of the present application is set on the iron cross arm, located between the suspension insulator and the tower body of the iron tower 10. When the wire swings due to wind, the post insulator 100 can block the wire from approaching the tower body of the iron tower 10 to prevent wind flashover. accident.

In this application, by wrapping the free end 112 with an insulating sheath 120, the free end 112 can be prevented from adopting a fitting structure, thereby avoiding the possibility of floating potential and partial discharge of the metal parts of the free end 112 in the high-voltage field strength, and preventing rapid product Aging or even insulation failure. In addition, if the free end 112 of the post insulator body 110 is made of metal parts, there is a risk of rubbing against the wire and damaging the wire. In this application, the insulating sheath 120 is used to wrap the free end 112 to avoid friction and damage to the wire. The condition of the wire.

In addition, this embodiment uses a post insulator 100 instead of a traditional line insulator as a wind-proof insulator. The traditional line insulator has a relatively small diameter and cannot withstand greater bending resistance. It needs to be directly connected to a wire to block the wind, and When the wind deflection angle is too large, the wire may be excessively deflected or broken after acting on the line insulator. However, if the post insulator 100 is used as the wind deflection insulator, there is no need to directly connect with the wire. The first end 111 of the pillar insulator body 110 of this embodiment is connected to the iron tower 10, and the free end 112 wraps the insulating sheath 120 without directly connecting the wires, and is arranged between the iron tower 10 and the wires, so that when the power grid is electrified, it can be It is installed or modified directly on the tower 10 without power outage operation, which brings huge market value to grid customers. In extreme typhoon weather, the post insulator 100 uses its own gravity to block the wind deflecting the wire and absorb energy. When the wire swings with the wind and collides with the post insulator 100, it can be effectively supported, and the maximum wind swing angle of the wire can be controlled to effectively prevent the wire from being caused by wind. The wind skew flashover accident caused by swinging and approaching the iron tower 10 ensures a safe electrical clearance between the wire and the iron tower 10 under strong wind conditions. Under extreme working conditions, the wire will not act on the post insulator 100, causing it to be excessively deflection or broken.

In one embodiment, as shown in FIGS. 2 and 3, the insulating sheath 120 is cup-shaped, and the insulating sheath 120 is buckled on the free end 112. By arranging the cup-shaped insulating sheath 120 and buckling the insulating sheath 120 to the free end 112, the free end 112 of the post insulator 100 can be completely wrapped, which is convenient for installation.

Specifically, as shown in FIGS. 2 and 3, the post insulator body 110 includes a core rod 113 and an insulating umbrella skirt 114 wrapped around the core rod 113. The end of the core rod 113 extending out of the insulating umbrella skirt 114 and away from the iron tower 10 is free. At the end 112, the insulating sheath 120 is buckled on the outside of the core rod 113, and is seamlessly connected with the insulating umbrella skirt 114 on the outer side of the pillar insulator body 110. Therefore, the insulating sheath 120 can completely wrap the core rod 113 exposed outside the insulating umbrella skirt 114, instead of the traditional metal parts, and effectively avoid the phenomenon that the metal parts of the free end 112 may generate floating potential and partial discharge in the high-voltage field.

Further, the insulating sheath 120 is made of high-temperature vulcanized silicone rubber. The high-temperature vulcanized silicone rubber has good heat resistance, water repellency, electrical insulation, and aging resistance, and is suitable for use in power transmission insulation equipment.

As shown in FIG. 3, in order to enhance the connection strength between the insulating sheath 120 and the post insulator body 110, a connecting layer (not shown in the figure) is provided between the insulating sheath 120 and the post insulator body 110. The sheath 120 and the post insulator body 110 are adhered, thereby enhancing the connection strength between the insulating sheath 120 and the core rod 113, and avoiding the insulating sheath 120 from falling off.

Further, the connecting layer is room temperature vulcanized silicone rubber, the room temperature vulcanized silicone rubber is coated in the insulating sheath 120, and then the insulating sheath 120 is buckled on the free end 112 of the post insulator body 110, and the room temperature vulcanized silicone rubber is respectively connected to the free end 112 of the post insulator body 110. The post insulator body 110 and the insulating sheath 120 are adhered, and the connecting layer can be formed after the room temperature vulcanized silicone rubber is cured. The use of room temperature vulcanized silicone rubber coating has good operational feasibility and good bonding performance.

In one embodiment, as shown in FIG. 3, the outer wall of the open end of the insulating sheath 120 has an inclined surface 121 inclined toward the pillar insulator body 110, and a connecting groove 122 is formed between the inclined surface 121 and the end surface of the insulating umbrella skirt 114. The connecting groove 122 can allow the excess room temperature vulcanized silicon rubber between the insulating sheath 120 and the post insulator body 110 to overflow, so as to improve the tightness of the connection between the insulating sheath 120 and the post insulator body 110. Furthermore, the connecting groove 122 can also be filled with high-temperature vulcanized silicone rubber to enhance the tightness of the connection between the inclined surface 121 of the insulating sheath 120 and the end surface of the insulating shed 114, and the aging performance of the exposed high-temperature vulcanized silicone rubber is better than Room temperature vulcanized silicone rubber, using high temperature vulcanized silicone rubber to wrap the connecting groove 122 can not only ensure the sealing connection of the insulating sheath 120 with the core rod 113 and the insulating umbrella skirt 114, but also ensure the overall aging resistance of the pillar insulator 100.

In one embodiment, as shown in FIGS. 2 and 4, the first end 111 of the pillar insulator body 110 is connected with an end fitting 140 for connecting the iron tower 10, and the end fitting 140 includes a sleeve 141, a flat plate 142, and a reinforcing rib. 143. Wherein, the sleeve 141 is sleeved and fixed to the first end 111, the other end of the core rod 113 of the post insulator body 110 protruding from the insulating umbrella skirt 114 is the first end 111, and the sleeve 141 is sleeved and fixed outside the core rod 113. One end of the plate 142 is provided with a U-shaped groove 1421 matching the end of the sleeve 141. The plate 142 is clamped and fixed to the end of the sleeve 141 through the U-shaped groove 1421. Because the plate 142 is fixed to the end of the sleeve 141 through the U-shaped groove 1421 Part, the contact area between the plate 142 and the sleeve 141 is increased, and the connection stability is improved. Specifically, the plate 142 and the sleeve 141 can be fixed by welding. In other embodiments, the plate 142 can also be integrally formed with the sleeve 141, which is not limited here. The rib 143 is located in the space formed by the surface of the plate 142 and the end surface of the sleeve 141. One side of the rib 143 is fixed on the surface of the plate 142, and the other side is fixed on the end surface of the sleeve 141, and the rib 143 can be vertical at the same time. On the surface of the plate 142 and the end surface of the sleeve 141. The reinforcing ribs 143 increase the connection strength between the plate 142 and the sleeve 141, and prevent it from bending or detaching under extreme weather conditions. Specifically, the reinforcing rib 143 may be fixed to the flat plate 142 and the sleeve 141 by welding. In other embodiments, the reinforcing rib 143 may also be integrally formed with the flat plate 142, which is not limited here.

In one embodiment, as shown in FIG. 4, the post insulator 100 further includes a connecting fitting 150. The end fitting 140 is connected to the tower 10 through the connecting fitting 150. The connecting fitting 150 includes two right-angled plates 151 and a flat plate 152. Two right-angled plates 151 are symmetrically sandwiched at the angle steel of the iron tower 10, one of the right-angled plates 151 is attached to the inner side wall of the angle steel, the other right-angled plate 151 is attached to the outer wall of one side of the angle steel, and fasteners 153 are installed between the two right-angled plates 151. For fixing, the plane plate 152 is attached to the outer wall of the other side of the angle steel, and is fixed to the two right-angle plates 151 by fasteners 153 respectively. The end fitting 140 is located on the side of one of the right-angled plates 151 away from the flat plate 152. The end fitting 140 is fixed to the connecting fitting 150 by a fastener 153. It should be noted that the end fitting 140, the right-angle plate 151 and the flat panel 152 can pass through The same fastener 153 passes through and is fixed. Therefore, the connecting hardware 150 fixes the pillar insulator body 110 to the iron tower 10 by clamping, without drilling holes in the iron tower 10, does not affect the strength of the iron tower 10 itself, and can ensure the universality of the connecting hardware 150 at different installation positions of the iron tower 10 Sex and convenience. Specifically, the fastener 153 may be a bolt or other parts used for fastening, and other common connection methods such as welding or glueing may also be used.

Please refer to FIG. 5, which is a schematic flow chart of the method for preparing the post insulator of the present application.

Another embodiment of the present application provides a method for preparing a post insulator, including the following steps:

S101: A cup-shaped insulating sheath 120 is formed.

A cup-shaped insulating sheath 120 is formed, and the insulating sheath 120 is matched with the free end 112 of the post insulator body 110. The insulating sheath 120 is made of high-temperature vulcanized silicon rubber and has excellent aging resistance.

S102: Coating room temperature vulcanized silicone rubber on the inner wall of the insulating sheath 120, buckle the insulating sheath 120 coated with room temperature vulcanized silicone rubber outside the free end 112, and wait for the room temperature vulcanized silicone rubber to cure.

Coat the inner wall of the insulating sheath 120 with room temperature vulcanized silicone rubber, coat the room temperature vulcanized silicone rubber in the insulating sheath 120, and then buckle the insulating sheath 120 to the free end 112 of the post insulator body 110 to remove the excess room temperature Wipe and remove the vulcanized silicone rubber. The room temperature vulcanized silicone rubber is respectively adhered to the post insulator body 110 and the insulating sheath 120. After the room temperature vulcanized silicone rubber is cured, a connecting layer can be formed, which enhances the connection strength between the insulating sheath 120 and the post insulator body 110.

The use of room temperature vulcanized silicone rubber coating has good operational feasibility and good bonding performance.

S103: Fill the connection groove 122 with silicone rubber compound.

The outer wall of the open end of the insulating sheath 120 has an inwardly inclined inclined surface 121. A connecting groove 122 is formed between the inclined surface 121 and the end surface of the insulating umbrella skirt 114 outside the pillar insulator 100. The connecting groove 122 is filled with silicone rubber compound.

S104: Heat and press the silicone rubber compound in the connecting groove 122 to cure to form a high-temperature vulcanized silicone rubber, thereby preparing the post insulator 100.

The silicone rubber compound in the connecting groove 122 is heated and pressurized and cured by a heating mold to form a high-temperature vulcanized silicone rubber, thereby preparing the post insulator 100. The aging performance of high temperature vulcanized silicone rubber exposed outdoors is better than that of room temperature vulcanized silicone rubber. The heating mold can only heat and press the silicone rubber compound in the connecting groove 122, and the heating temperature will not affect the insulating sheath 120 and the insulating umbrella skirt 114. At the same time, the high-temperature vulcanized silicone rubber can enhance the tightness of the connection between the inclined surface 121 of the insulating sheath 120 and the end surface of the insulating umbrella skirt 114.

In another embodiment, it further includes the following steps:

S105: Polish the cured high-temperature vulcanized silicone rubber at the connecting groove 122.

The high-temperature vulcanized silicone rubber at the connecting groove 122 after curing is polished to make the surface smooth and beautiful.

Please refer to FIG. 6, which is a schematic diagram of a three-dimensional structure of an embodiment of the power transmission tower of the present application.

Another embodiment of the present application provides a power transmission tower 200. The power transmission tower 200 is equipped with a post insulator 100, and the post insulator 100 is any of the above-mentioned post insulators 100. At least one pillar insulator 100 is provided on the power transmission tower 200 to prevent the wire 20 from approaching the tower body under wind deviation.

In this embodiment, one pillar insulator 10 is provided, and the pillar insulator 100 is only provided on the side of the power transmission tower 200 where the wires 20 are arranged, between the wires 20 and the tower body. In other embodiments, there are at least two pillar insulators 100, and they are symmetrically arranged on both sides of the power transmission tower 200 to block the wires 20 on both sides of the power transmission tower 200 from approaching the power transmission tower 200, respectively. For example, two, four or more post insulators 100 are provided, and one, two or more are provided on each side.

In other embodiments, on the side of the power transmission tower 200 where the wire 20 is provided, at least two post insulators 100 may also be provided, and they are symmetrically arranged on both sides of the iron cross arm along the direction of the wire 20. Therefore, the post insulator 100 can effectively prevent the wire 20 from approaching the power transmission tower 200, and at least two post insulators 100 can share the impact force of the wind deflecting wire 20 to improve the overall pressure resistance. Specifically, two pillar insulators 100 are provided, and in other embodiments, three, four or more may be provided.

It should be noted that the post insulator 100 includes a post insulator body 110 and an insulating sheath 120. Wherein, the post insulator body 110 includes a first end 111 for connecting the power transmission tower 200 and a free end 112 opposite to the first end 111, and an insulating sheath 120 is wrapped around the free end 112.

By using the insulating sheath 120 to wrap the free end 112, the free end 112 can be prevented from adopting a metal fitting structure, thereby avoiding the possibility of floating potential and partial discharge in the metal parts of the free end 112 in the high-voltage field strength, and preventing the rapid aging of the product Even the case of insulation failure. In addition, if the free end 112 of the post insulator body 110 is made of metal parts, there is a risk of rubbing against the wire 20 and damaging the wire 20. In this application, an insulating sheath 120 is used to wrap the free end 112 to avoid friction with the wire 20. , Damage to the wire 20.

This application uses a post insulator 100 instead of a traditional line insulator as a wind-proof insulator. The traditional line insulator has a relatively small diameter and cannot withstand greater bending resistance. It needs to be directly connected to the wire 20 to block the wind, and the post insulator 100 is used as the The wind-proof insulator may not be directly connected to the wire 20. The first end 111 of the pillar insulator body 110 of the present application is connected to the iron tower 10, and the free end 112 wraps the insulating sheath 120 without directly connecting the wire 20, and is arranged between the transmission tower 200 and the wire 20, so that when the power grid is charged , The pillar insulator 100 can be installed or modified directly on the transmission tower 200 without power outage operation, which brings huge market value to grid customers. In extreme typhoon weather, the post insulator 100 uses its own gravity to block the wind deflecting the conductor 20 and absorb energy. When the conductor 20 swings with the wind and collides with the post insulator 100, it can be effectively supported, and the maximum wind swing angle of the conductor 20 can be controlled to effectively contain it. The wind skew flashover accident caused by the wire 20 approaching the power transmission tower 200 due to wind swing ensures a safe electrical gap between the wire 20 and the power transmission tower 200 under strong wind conditions. Under extreme working conditions, the wire 20 will not act on the post insulator 100, resulting in excessive deflection.

The above are only implementations of this application, and do not limit the scope of this application. Any equivalent structure or equivalent principle transformation made using the content of the description and drawings of this application, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of this application.

Claims

A post insulator, characterized in that it comprises:

The post insulator body includes a first end for connecting the iron tower and a free end opposite to the first end;

An insulating sheath is wrapped around the free end.
The post insulator according to claim 1, wherein the insulating sheath is cup-shaped, and the insulating sheath is buckled on the free end.
The post insulator according to claim 2, wherein the post insulator body comprises a core rod and an insulating umbrella skirt wrapped around the core rod, and one end of the core rod protruding from the insulating umbrella skirt is At the free end, the insulating sheath is buckled on the outside of the core rod, and is seamlessly connected with the insulating umbrella skirt on the outer side of the pillar insulator body.
The post insulator according to claim 3, wherein the outer wall of the open end of the insulating sheath has an inclined surface inclined toward the main body of the post insulator, and a connection is formed between the inclined surface and the end surface of the insulating umbrella skirt groove.
The post insulator according to claim 4, wherein the connecting groove is filled with high-temperature vulcanized silicon rubber.
The post insulator according to claim 1, wherein a connecting layer is provided between the insulating sheath and the post insulator body, and the connecting layer is respectively adhered to the insulating sheath and the post insulator body .
The post insulator according to claim 6, wherein the insulating sheath is made of high temperature vulcanized silicone rubber, and the connecting layer is made of room temperature vulcanized silicone rubber.
The post insulator according to any one of claims 1-7, wherein the first end is connected with an end fitting for connecting the iron tower, and the end fitting comprises:

A sleeve, sleeved and fixed to the first end;

A flat plate, one end of the flat plate is provided with a U-shaped groove matching the end of the sleeve, and the flat plate is clamped and fixed to the end of the sleeve through the U-shaped groove;

The reinforcing rib is located in the space formed by the surface of the flat plate and the end surface of the sleeve. One side of the reinforcing rib is fixedly arranged on the surface of the flat plate, and the other side is fixedly arranged on the end surface of the sleeve.
A method for preparing a post insulator, characterized in that the method includes the following steps:

Forming a cup-shaped insulating sheath that matches the free end of the post insulator body;

Coating room temperature vulcanized silicone rubber on the inner wall of the insulating sheath;

Buckle the insulating sheath coated with the room temperature vulcanized silicone rubber outside the free end, and wait for the room temperature vulcanized silicone rubber to cure;

The outer wall of the open end of the insulating sheath has an inwardly inclined inclined surface, and a connecting groove is formed between the inclined surface and the end surface of the insulating umbrella skirt outside the pillar insulator, and a silicone rubber compound is filled in the connecting groove ；

The silicone rubber compound in the connecting groove is heated, pressurized and cured to form a high-temperature vulcanized silicone rubber, thereby preparing the pillar insulator.
The preparation method according to claim 9, characterized in that it further comprises:

Polishing the high-temperature vulcanized silicone rubber at the connecting groove after curing.
A power transmission tower, characterized in that the power transmission tower adopts the post insulator according to any one of claims 1-8, and at least one post insulator is provided on the power transmission tower.
The power transmission tower according to claim 11, wherein at least two pillar insulators are provided, and they are symmetrically arranged on both sides of the power transmission tower to prevent the wires from approaching the power transmission tower.