Live working fully insulated disconnectable gapless surge arrester device

Abstract

A live-line working, fully insulated, separable gapless surge arrester device comprises: a piercing, detachable insulated clamp, a high-voltage lead, a lightweight insulating cavity, an upper contact, an upper insulated waterproof piston ring, the arrester body, a lower insulated waterproof piston ring, an insulating sheath, a contact ring, a contact piece fixing ring, a contact piece, an elastic tension spring, a metal bracket, an insulating bracket, a disconnector connection bracket, a disconnector, a disconnector itself, and a lead wire connection terminal. It is mainly used for overvoltage protection of power distribution lines. The insulated operating rod allows for live-line installation and removal of the arrester body and disconnector, improving installation and maintenance efficiency. The disconnector temporarily isolates power frequency current and clearly indicates the fault point, reducing losses caused by power outages due to grounding short circuits. The disconnector connection bracket facilitates live-line separation and replacement of the disconnector. The device is fully insulated, improving the insulation process of the line. The piercing, detachable insulated clamp facilitates live-line installation and removal, eliminating the need to strip the insulation from the conductor, thus improving installation efficiency and line insulation.

Description

Technical fields:

[0001] This invention relates to the field of research and development of separable gapless surge arresters, specifically to a live-line working fully insulated separable gapless surge arrester device. Background technology:

[0002] Currently, surge arresters on overhead power lines are all installed on outdoor line crossarms. The HY5W type composite-jacketed metal oxide gapless surge arrester, conforming to national standards, is the most widely used surge protection product. It is fixed to the line crossarm with bolts and requires branch leads for connection. During annual preventative maintenance or in case of lightning damage, power must be cut off, the pole must be climbed, the line removed, and the arrester unscrewed. After testing and verification, or replacement, it is then reinstalled on the line crossarm. Gapless surge arresters, due to their long-term exposure to system voltage during operation, are prone to aging and damage, requiring regular inspection and replacement. Damage to power lines at high altitudes is difficult to detect. The fault can only be identified and repaired after a ground fault is discovered or through line patrol. In some areas, disconnectors are installed to isolate the system current and prevent grounding, providing a display for line inspection. However, due to issues with the quality and workmanship of the disconnectors themselves, abnormal disconnection often occurs, increasing the number of fault repairs and the time required. This leads to an increase in the time when the line is unprotected. The main drawback is that once either the surge arrester or the disconnector is damaged, it can only be replaced after the power is cut off. During the replacement period, if there is another lightning strike or overvoltage, it will no longer provide protection. Using a bucket truck for live replacement consumes a lot of manpower and resources and is also limited by the terrain.

[0003] Another type of drop-out surge arrester disclosed in CN201320171068.7 is a modified zinc oxide surge arrester installed on the drop-out mechanism of the original drop-out fuse, so that the surge arrester can be inspected, repaired and replaced with the help of an insulated operating rod without interrupting power. Its disadvantages include a complex drop-out mechanism structure, high processing costs, and troublesome assembly; exposed main electrical components are prone to aging, flashover, and short circuits, affecting the overall insulation design process; when the surge arrester body is closed, the elastic sheet is compressed and stores energy, making it prone to fatigue failure; if the disconnector itself malfunctions, the drop-out mechanism will fail, leaving the line unprotected from lightning; the drop-out mechanism is also installed outdoors on the line crossarm, and surge arresters have a relatively short lifespan among overhead line equipment, making them prone to damage. Inspection, maintenance, and replacement are currently prominent and troublesome issues for the power sector, especially since the exposed parts of zinc oxide surge arresters are made of silicone rubber, which is prone to aging and cracking in natural environments and being damaged by birds, reducing its service life; numerous electrical connection points mean numerous electrical fault points, which also affects the overall line insulation and aesthetics; low integration and relatively bulky design.

[0004] Another type is the chamber surge arrester, which mainly involves moving the zinc oxide surge arrester body from outdoors into indoors to reduce the impact of the natural environment on the surge arrester body; the surge arrester can be inspected, repaired and replaced with the help of an insulated operating rod. Although it has the function of quick replacement of the surge arrester body for live-line work, it lacks the function of quickly and easily installing and removing the surge arrester device during live-line work. The porcelain jacket is heavy and fragile. If the surge arrester fails and explodes, the flying metal oxides along with the fragile porcelain jacket can easily injure other electrical equipment and passersby. It is also inconvenient to install at high positions on the line. There is no sealing design between the surge arrester body and the cavity. Long-term operation is affected by the environment. Under harsh climatic conditions, water vapor and salt can easily enter the cavity and cause failure, especially in coastal areas with high salt spray concentrations. Because there is no sealing treatment between the surge arrester body and the cavity, the surge arrester body needs to increase the insulation height and creepage skirt distance, which increases the weight. The surge arrester is prone to falling due to its excessive weight, which also makes the overall cost too high. The line is unsightly, and the button-type insulation cover is easily blown off by the wind, which cannot achieve true sealing and full insulation. It is difficult to install intelligent detection devices to match the smart grid. Summary of the Invention:

[0005] The purpose of this invention is to overcome the aforementioned shortcomings and to develop a method for quickly installing or removing the surge arrester body and disconnector during live-line work using only an insulated operating rod. The disconnector is cleverly equipped for isolating power frequency current within the system and providing indication during maintenance. The invention utilizes a lightweight, rigid PC insulating material with high strength, high electrical performance, good explosion-proof and anti-aging properties, and significantly reduced overall device weight. The uppermost skirt is larger than all the lower skirts, and the design of the large and small umbrellas creates a rain-proof and pollution-proof insulating cavity. The inner wall and the surge arrester body are fully insulated and sealed, ensuring that the overall electrical performance of the surge arrester is not affected by harsh natural conditions. The live-line work involves piercing the conductor for splicing, without damaging the conductor's insulation layer, which is beneficial for achieving full insulation of the line. This reduces the number and duration of line faults, simplifies the device, lowers costs, and improves power supply reliability.

[0006] Technical solution

[0007] A live-line working, fully insulated, separable, gapless surge arrester device comprises: a piercing, detachable insulating clamp 1, a high-voltage lead 2, a lightweight insulating cavity 3, a metal bracket 4, an insulating bracket 5, a disconnector connection bracket 6, an upper contact 7, an upper insulating and waterproof piston ring 8, a surge arrester body 9, a contact ring 10, a lower insulating and waterproof piston ring 11, an insulating sheath 12, a disconnector 13, a disconnector 14, an elastic tension spring 15, a contact piece 16, a contact piece fixing ring 17, a lead wire connection terminal 18, and an upper contact piece 19. It is mainly used for overvoltage protection of overhead power distribution lines. The 1.4 on the piercing-type detachable insulating clamp 1 with the drain wire attached can be operated by an insulated operating rod during live-line work. It can be directly connected to the insulated conductor without the need for manual stripping of the insulation on the rod, and without damaging the insulation layer of the conductor. The plug-in design allows for quick maintenance and replacement of the separator 13, surge arrester body 9, and disconnector 14 assemblies by plugging and unplugging the insulated operating rod during live-line work, reducing the inconvenience caused by power outages and improving the efficiency of installation and maintenance. The lightweight insulating cavity 3 is made of PC material with excellent electrical and mechanical properties, which greatly reduces the weight of the overall device while also providing explosion-proof effect, reducing costs, and facilitating construction.

[0008] One end of the high-voltage lead 2 is crimped to the upper end of the lead wire connection terminal 18, and the other end of the lead wire connection terminal 18 passes through the top of the lightweight insulating cavity 3 and is screwed to the inner upper contact piece 19 to form an integral unit. A rubber sealing ring is placed between them. The insulating sleeve 12 is tightly fitted on the outside of the lead wire connection terminal 18 to prevent water vapor and salt spray from entering the cavity and affecting the electrical performance of the surge arrester body 9.

[0009] The lightweight insulating cavity 3 has a tower-shaped structure. The large and small umbrella skirts are designed to meet the creepage distance requirements. The uppermost umbrella skirt is larger than all the lower umbrella skirts, which serves as a rain curtain, prevents dirt, and prevents icicles from sticking to the other umbrella skirts. It also has a certain effect in blocking heavy snowfall, making the surge arrester more reliable in insulation under natural disasters. The base of the large and small umbrella skirts adopts an arc transition to enhance the cavity strength and play an explosion-proof role, preventing the surge arrester from being damaged and exploding with flying fragments. Once the surge arrester fails and explodes, the flying metal oxides, along with the fragile porcelain jacket, can easily cause a line grounding fault, damaging other electrical equipment and pedestrians.

[0010] An insulating and waterproof piston ring 8 is installed on the upper part of the surge arrester body 9 for sealing. The screw hole at the lower end of the upper contact 7 is tightened and pressed against the upper end face of the insulating and waterproof piston ring 8. The upper contact 7 and the upper contact piece 19 make tight, elastic, and electrodynamic contact to ensure a stable electrical connection.

[0011] The lower end of the contact ring 10 and the separator 13 are tightly sealed with a lower insulating waterproof piston ring 11 made of elastic and sealing rubber vulcanization. When inserted into the surge arrester body, the lower insulating waterproof piston ring 11 will move along the inner wall of the lightweight insulating cavity 3 to prevent water vapor and salt spray from entering the interior of the lightweight insulating cavity 3 from the lower part, thus maintaining a good electrical environment inside the cavity.

[0012] The metal bracket 4 and the contact plate fixing ring 17 are screwed together as a whole with a sealing ring between them. The metal bracket 4 clamps the lightweight insulating cavity 3. The use of metal material can increase its strength and conductivity. The cross plate at the other end of the metal bracket (4) is screwed to one end of the insulating bracket (5). The other end of the insulating bracket (5) can be installed on the line crossarm. After the surge arrester body 9 is damaged, the disconnector bursts and falls off, isolating the power frequency current in the system. The insulating bracket 5 increases the distance between the grounding point and the break below the disconnector, reducing the impact of the surge arrester and disconnector damage on the line operation.

[0013] The contact ring 10 has two holes on its side and is screwed to the separator 13 as a whole. The contact ring 10 has a stepped structure, which can limit the position when the contact piece is clamped to the contact ring.

[0014] The bottom of the contact piece fixing ring 17, made of a metal material with good conductivity, is evenly distributed with screw holes to fix the contact piece 16. The contact piece 16, made of a metal material with good conductivity and good elasticity, is in tight, elastic and constant electrical contact with the contact ring 10 to ensure normal current flow. The side of the contact piece fixing ring 17 is provided with screw holes to be screwed to the metal bracket 4, which is equivalent to screwing the contact piece fixing ring 17 inside the light insulating cavity 3 in the middle of the outer metal bracket 4 into one piece.

[0015] The lower outer diameter of the surge arrester body 9 is tightly fitted with the inner wall of the contact ring 10. The metal electrode at the bottom of the surge arrester body 9 is in tight electrical contact with the end of the contact ring 10 through a screw connection. The lower end of the surge arrester body 9 is tapered, and the flexibility of the silicone rubber jacket makes the connection more compact and secure. The contact ring 10 and the separator 13 are connected as a whole by a tapered tightening and sealing structure. The separator 13 is made of high-strength UV-resistant PC insulation material. The lower part of the separator is tapered and the waist is provided with symmetrical cylindrical insertion and removal operation locks, which facilitates the insertion and removal of the insulating operating rod into and out of the surge arrester body 9.

[0016] The disconnector (14) is screwed with a double-ended bolt through the separator (13), then through the contact ring (10) and the lower insulating waterproof piston ring (11), and tightened onto the screw hole at the lower end of the surge arrester body (9) to form an integral electrical connection. When the surge arrester body 9 is damaged, the disconnector disconnects, thus isolating the power frequency current in the system.

[0017] The release device 14 adopts a thermal explosion release device, which is more stable and less affected by the environment compared with the thermal fusion release device.

[0018] The lightweight insulating cavity 3 is molded from lightweight, rigid, UV-resistant PC insulating material with high strength, excellent electrical performance, good explosion-proof and anti-aging properties, which greatly reduces the weight of the overall device.

[0019] The lightweight insulating cavity 3 has a tower-shaped structure. The combination of large and small umbrella skirts meets the creepage distance requirements. The uppermost umbrella skirt is larger than all the lower ones, serving as a rain curtain, preventing dirt and icicles from sticking to the other umbrella skirts. It also provides some protection against heavy snowfall, making the surge arrester's insulation more reliable under natural disasters. The base of the large and small umbrella skirts features a rounded transition to enhance the cavity's strength and provide explosion protection, preventing the surge arrester from shattering and sending flying fragments. If the surge arrester fails and shatters, the flying metal oxides, along with the fragile porcelain casing, can easily cause a grounding fault, damaging other electrical equipment and pedestrians.

[0020] The lead wire of the disconnector 14 is screwed onto the disconnector connecting bracket 6. The disconnector connecting bracket 6 can be screwed onto the line crossarm for live operation using an insulated operating rod. The metal bracket 4 and the insulated bracket 5 are screwed together as one unit. The metal bracket 4 meets the strength and stability requirements, and the insulated bracket meets the insulation requirements after the disconnector is detached.

[0021] The lightweight insulating cavity 3 has a certain taper in its upper and lower structure, which makes the sealing structure between the lightweight insulating cavity 3 and the surge arrester body 9 better. The structure of the lightweight insulating cavity 3, which is narrow at the top and wide at the bottom, makes the surge arrester body 9 fit into the lightweight insulating cavity 3 more and more tightly. The bottom of the contact ring 10 is sealed with a lower insulating and waterproof piston ring 11.

[0022] The end of the lead wire 2 is crimped onto a piercing, detachable insulating clamp 1 made of a metal material with good conductivity. A flexible, elastic rubber insulated cover 1.5 tightly encloses the clamp, preventing wind, rain, and moisture damage. An operating rod can be used for live-line work by attaching it to the installation ring 1.4. The piercing, detachable insulating clamp 1's locking mechanism allows for easy tightening onto the high-voltage conductor. Tightening the ring bolt 1.3 causes the slider 1.9 to press against the insulated conductor. The three piercing teeth 1.2 evenly penetrate the insulated conductor, ensuring a stable electrical connection. The length of the piercing teeth has been tested and verified to ensure a sufficient electrical connection without damaging the conductor. The piercing method simplifies installation, eliminating the need to strip the conductor's insulation layer, reducing exposed points, and facilitating complete insulation of the line.

[0023] The lead wire 2 and the lead wire splice terminal 1.6 on the piercing detachable insulating clamp 1 are crimped together as a whole and sealed by the terminal insulating cover 1.5. The lead wire splice terminal 1.6 on the piercing detachable insulating clamp 1 is screwed together with the body 1.10 of the piercing detachable insulating clamp 1, with a sealing ring 1.7 between them to prevent water vapor and salt stains from entering the connection and causing corrosion over time.

[0024] The outer surface 1.15 of the ring bolt 1.3 on the piercing-type removable insulated clamp 1 is made of rigid insulating material to provide insulation protection. The outer surface 1.13 of the slider 1.9 is made of flexible insulating material to ensure close contact with the insulated wire. The mounting ring 1.4, together with the insulating layer (1.14) on the surface of the metal clamp body (1.10), is made of rigid insulating material and serves as an insulated operating lever. The outer sleeve 1.12 of the screw 1.8 is made of flexible insulating material. The insulated operating lever is hung on the mounting ring 1.4 and rests on the insulated wire. Tightening the ring bolt 1.3 activates the internal pressure block 1.9. The port automatically closes, tightly connecting the insulated wire to the upper body 1.10. The screw sleeve 1.12 is made of soft insulating material. When the annular screw 1.3 is turned, the screw sleeve 1.12 will extend and retract. The piercing detachable insulating clamp 1 has three barbs 1.2 that penetrate into the inside of the insulated wire. The three barbs ensure a stable electrical connection. The spring washer (1.1) plays a role in preventing loosening and has good current carrying capacity during overvoltage and lightning strikes. Attached image description:

[0025] Figure 1 This is a structural diagram of the fully insulated, separable, gapless surge arrester device for live-line operation according to the present invention.

[0026] Figure 2 This is a structural diagram of the surge arrester body, upper and lower insulating and waterproof piston rings, contact ring, and upper contact of the present invention.

[0027] Figure 3 This is a structural diagram of the piercing-type detachable insulating clamp of the present invention. Detailed implementation method:

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and working principle, but this is not intended to limit the scope of protection of the present invention.

[0029] A live-line working fully insulated separable gapless surge arrester device comprises: a piercing detachable insulating clamp 1, a high-voltage lead 2, a lightweight insulating cavity 3, a metal bracket 4, an insulating bracket 5, a disconnector connection bracket 6, an upper contact 7, an upper insulating waterproof piston ring 8, a surge arrester body 9, a contact ring 10, a lower insulating waterproof piston ring 11, an insulating sheath 12, a disconnector 13, a disconnector 14, an elastic tension spring 15, a contact piece 16, a contact piece fixing ring 17, a lead wire connection terminal 18, and an upper contact piece 19, etc.

[0030] The surge arrester body 9, consisting of an upper contact 7, an upper insulating and waterproof piston ring 8, a contact ring 10, and a lower insulating and waterproof piston ring 11, is inserted into the lightweight insulating cavity 3. The upper contact 7 makes tight and elastic contact with the upper contact piece 19. When inserted into place, there is a noticeable locking sensation between the step of the contact ring 10 and the contact piece 16. One end of the upper lead wire 2 is crimped onto the upper end of the lead wire connection terminal 18 screwed to the top of the lightweight insulating cavity 3 and sealed with an insulating sleeve 12. The other end of the lead wire 2 is crimped onto a piercing detachable insulating clamp 1. At position 1.6, the piercing detachable insulating clamp 1 can be hooked onto the insulated conductor of the line; the metal bracket 4 and the insulating bracket 5, which are clamped on the lightweight insulating cavity 3, are screwed together as one unit. The other end of the insulating bracket 5 can be installed on the iron crossarm of the line, or the other end of the insulating bracket 5 can be equipped with a live working installation bracket for live working installation on the iron crossarm of the line. Then, the disconnector connection bracket 6 together with the disconnector lead wire is installed on the iron crossarm of the line, thus installing the entire device on the line.

[0031] The product is mainly used for line overvoltage protection. The surge arrester body 9 can be installed or removed by live working with an insulated operating rod; the surge arrester body 9 inside the lightweight insulated cavity 3 can be quickly inspected, plugged in and replaced by an insulated operating rod while working under live conditions, reducing the inconvenience caused by power outages and improving the efficiency of installation and maintenance.

[0032] When the line is struck by lightning, the lightning current passes through the barbs 1.2 on the piercing detachable insulating clamp 1 to the guide wire 2. The lightning current then travels along the guide wire 2 to the arrester body 9. Under high voltage conditions, the arrester body 9, made of zinc oxide material, is in a low-resistance state. The lightning current is then conducted to the grounding wire through the disconnector 14. After the lightning current is discharged to the ground, the arrester body 9 returns to a high-resistance state. Due to the absence of gaps, the arrester also has a good protection effect against switching overvoltages.

[0033] When a surge arrester is damaged, use the insulated operating rod to hold the operating latches on both sides of the separator 13 to pull out the surge arrester body 9. Then, use the operating rod to replace it with a new surge arrester body 9 and continue operation. There is no need to connect a grounding wire; it can be directly plugged in and unplugged. In traditional lines, surge arresters can only be replaced after the power is cut off, or by connecting a bypass grounding wire, which consumes a lot of manpower and resources. During the damage period, the surge arrester cannot protect the line, and the power outage will cause certain economic losses. Therefore, live-line work is particularly important.

[0034] The lightweight insulating cavity 3 is made of high-quality PC material, which has excellent electrical insulation performance, high mechanical strength, excellent explosion-proof performance, good waterproof and pollution-resistant performance, and greatly reduces the weight of the overall device. When installed at a high position on the line, if an old surge arrester fails and explodes, the flying metal oxides along with the fragile porcelain jacket can easily cause a grounding fault in the line, damaging other electrical equipment and pedestrians.

[0035] The lightweight insulating cavity 3 is designed with the largest uppermost umbrella skirt, which can effectively protect the lower umbrella skirts. Tests have shown that using the largest first umbrella skirt can better prevent surface flashover, and is especially effective in blocking the electrical path formed by rain curtains, icicles, and snow.

[0036] The upper insulating and waterproof piston ring 8 has a structural design similar to that of a car piston. It is injection molded from a rigid insulating material, with two grooves on its arc surface to install a soft and elastic rubber ring, which serves both a sealing and insulating function. Because the lightweight insulating cavity has multiple layers of sealing insulation, it prevents the high voltage at the top of the surge arrester body 9 from creeping through the cavity. Creeping will occur from the outside of the lightweight insulating cavity 3 with its awning.

[0037] The high-voltage lead 2 uses a soft rubber-insulated fine copper wire. When attaching the piercing-type detachable insulating clamp 1, the attachment angle and direction can be easily adjusted. After the torque operating rod is installed in place, there will be a clear prompt sound to prevent the piercing teeth from penetrating the insulating wire too deeply and damaging the wire, or too shallowly and causing poor contact.

[0038] The insulating bracket 5 can be directly installed on the line crossarm, or it can be installed with a suitable live-line installation bracket. In this way, the entire device can be installed quickly under live conditions, and whether it is initial installation or maintenance, it can be done under live conditions, avoiding the losses caused by power outages.

[0039] The lightweight insulating cavity 3 is made of rigid, high-strength PC material, which can prevent birds from tearing and pecking at it. In particular, with the improvement of the environment in recent years, the number of birds has increased, which has caused some damage to the operation of the line.

[0040] The design aims to: reduce weight and enhance explosion-proof performance; improve the insulation level of the line; enable rapid live-line work, allowing the installation, disassembly, and replacement of the product to be completed on the ground using an insulated operating rod without climbing poles, reducing labor intensity and improving maintenance safety; during installation, the live-line work involves piercing the conductors to splice them without damaging the conductor insulation layer, which is conducive to achieving full insulation of the line; the surge arrester body 9 is installed in a lightweight insulating cavity 3 to avoid the damage of sunlight, rain, snow, fog, haze, and salt spray, making the surge arrester more stable and extending its service life; reduce the number and duration of line faults; simplify the device, reduce costs, and improve power supply reliability.

Claims

1. A fully insulated, separable, gapless surge arrester device for live-line working, comprising: Piercing detachable insulating clamp (1), high voltage lead (2), lightweight insulating cavity (3), metal bracket (4), insulating bracket (5), disconnector connection bracket (6), upper contact (7), upper insulating waterproof piston ring (8), surge arrester body (9), contact ring (10), lower insulating waterproof piston ring (11), insulating sheath (12), separator (13), disconnector (14), elastic tension spring (15), contact piece (16), contact piece fixing ring (17), drain wire splice terminal (18), upper contact piece (19); One end of the high-voltage lead (2) is crimped to the upper end of the drain line connector (18), and the other end of the high-voltage lead (2) is connected to the piercing detachable insulating clamp (1). The other end of the drain line connector (18) passes through the top of the lightweight insulating cavity (3) and is screwed to the inner upper contact piece (19) to form an integral unit. A rubber sealing ring is placed between them, and the insulating sleeve (12) is tightly fitted on the outside of the drain line connector (18). The lightweight insulating cavity (3) has a tower-shaped structure, with large and small umbrella skirts that are matched to meet the creepage distance requirements. The uppermost umbrella skirt is larger than all the lower umbrella skirts. The inner wall of the lightweight insulating cavity (3) has a taper of more than half a degree at the top and bottom. The upper end of the surge arrester body (9) is equipped with an upper insulating and waterproof piston ring (8), and the lower end of the upper contact (7) is screwed into the upper end face of the insulating and waterproof piston ring (8). The upper contact (7) and the upper contact piece (19) are in tight elastic electrodynamic contact. The lower part of the contact ring (10) is equipped with a lower insulating and waterproof piston ring (11); the side of the contact ring (10) is provided with screw holes that are screwed into the separator (13) as a whole; The metal bracket (4) is ring-shaped and tightly clamps the outer wall of the lightweight insulating cavity (3), and one side is screwed into the contact piece fixing ring (17); the bottom end of the contact piece fixing ring (17) is distributed with screw holes to fix the contact piece (16); The separator (13) is screwed into the conical bottom of the surge arrester body (9) and fits tightly; the lower part of the separator (13) is conical and has symmetrical cylindrical plug-in operation latches on both sides of its waist. The disconnector (14) is screwed with a double-headed bolt through the disconnector (13), then through the contact ring (10) and the lower insulating waterproof piston ring (11), and tightened onto the screw hole at the lower end of the surge arrester body (9) to form an electrical connection. The lead wire of the release device (14) is screwed onto the release device connecting bracket (6); The horizontal plate of the metal bracket (4) and one end of the insulating bracket (5) are screwed together as one unit.

2. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: The upper insulated and waterproof piston ring (8) is equipped with two sealing rings.

3. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: A sealing ring is placed between the metal bracket (4) and the contact plate fixing ring (17).

4. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: The contact piece fixing ring (17) has a screw hole on its side and is screwed into the metal bracket (4).

5. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: The separator (13) is made of high-strength UV-resistant insulating material.

6. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: The release device (14) is a thermal explosion release device.

7. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: The lightweight insulating cavity (3) is injection molded from UV-resistant PC rigid insulating material, with a rounded transition at the root of the umbrella skirt and a smooth inner wall surface.

8. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: The outer surface of the surge arrester body (9) is smooth and without a skirt.

9. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: The disconnector connection bracket (6) can be attached to the line crossarm by means of an insulated operating rod during live operation.

10. The live-line working fully insulated separable gapless surge arrester device as described in claim 1, characterized in that: The other end of the insulating bracket (5) can be installed on the line crossarm.

11. The live-line working fully insulated separable gapless surge arrester device as described in claim 1, characterized in that: The lead wire connection terminal (1.6) on the piercing detachable insulating clamp (1) is screwed into the screw hole on the lower side of the body (1.10) on the piercing detachable insulating clamp (1), with a sealing ring (1.7) between them. The sealing insulating sleeve (1.5) is wrapped around the outside of the high voltage lead wire (2) and the lead wire connection terminal (1.6).

12. The live-line working fully insulated separable gapless surge arrester device as described in claim 1, characterized in that: The piercing detachable insulating clamp (1) is provided with an insulating mounting ring (1.4), and together with the surface insulation layer (1.14) of the metal clamp body (1.10) and the surface insulation layer (1.15) of the metal ring bolt (1.3), they are molded by injection molding with hard insulating material.

13. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: The movable pressure block (1.9) on the piercing removable insulating clamp (1) is movably connected to the top of the screw (1.8) on the metal ring bolt (1.3), with an anti-loosening spring washer (1.1) installed between them. The movable pressure block (1.9) has three barbs (1.2) at the V-shaped part.

14. The fully insulated, separable, gapless surge arrester device for live-line working as described in claim 1, characterized in that: The screw (1.8) on the piercing removable insulating clamp (1) is fitted with an outer insulating sleeve (1.12) made of soft insulating material, and the movable clamping block (1.9) is fitted with an insulating sheath (1.13) made of soft insulating material.

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