Full-insulation separable hanging fixed-gap lightning arrester device for live working

Abstract

A fully insulated separable hanging type fixed-gap lightning arrester device for live working, comprising: a live working installation bracket, a hanging connection plate, an upper mouth sealing ring, an upper contact piece, a light insulation cavity, a drainage wire connection pile head, a sealing ring, a pile head insulation cover, a drainage wire, a detachable wire clamp, an upper contact, an upper insulating waterproof piston ring, a lower insulating waterproof piston ring, a contact ring, a contact piece fixing ring, a contact piece, an elastic spring, a lightning arrester body, a separator, a fixed-gap insulator, etc. It is mainly applied to line lightning protection. The device is fully insulated; the lightning arrester device can be installed or removed live with an insulating operating rod; the lightning arrester body can be quickly separated for maintenance, inserted and removed for replacement with an insulating operating rod during live working, reducing power outages and improving the efficiency of maintenance; the fixed-gap insulator isolates the power frequency voltage and reduces the aging of the lightning arrester; it is installed in a hanging manner on the original cross arm, reducing the lightning arrester cross arm, increasing the line corridor and aesthetics, and reducing the construction cost.

Description

Technical Field:

[0001] The present invention relates to the research and development and design field of separable hanging type fixed-gap lightning arresters, and particularly relates to a fully insulated separable hanging type fixed-gap lightning arrester device for live working. Background Art:

[0002] To prevent the increasingly serious problems of overhead distribution insulated wires being broken by lightning strikes and tripping caused by power frequency follow current, currently, composite outer jacket external fixed-gap metal oxide lightning arresters are gradually installed beside pole insulators. For example, a line-type fixed-gap metal oxide lightning arrester disclosed in CN203659557 U integrally connects the high-voltage end of the currently widely used traditional silicone rubber composite outer jacket metal oxide lightning arrester to a silicone rubber composite outer jacket insulator with a fixed gap. The main purpose is to isolate the power frequency voltage with an air gap, and there is no need to manually adjust the distance between the upper and lower electrodes of the air gap during installation. However, there are still deficiencies. The main disadvantages are that the high-voltage end of the lightning arrester is integrally connected to the silicone rubber composite outer jacket insulator with a fixed gap. Once the lightning arrester or the gap insulator is damaged, they have to be replaced together; it is difficult to install or disassemble during live working. When the lightning arrester needs routine inspection or is damaged, it often waits for power outage for disassembly inspection or replacement. During the replacement period, if there are lightning strikes and overvoltage attacks again, it cannot continue to play a protective role. In places where conditions permit, an insulated boom truck is used for live working, which consumes a large amount of manpower and material resources and is restricted by the terrain; the exposed flexible silicone rubber composite outer jackets of the lightning arrester and the insulator are prone to aging and cracking, and being pecked by birds in the natural environment, reducing the service life; once the lightning arrester without an outer jacket protection fails and explodes, the splashing metal oxides are likely to damage other electrical equipment and passers-by.

[0003] Another type of drop-type lightning arrester disclosed in CN201320171068.7 is to modify a zinc oxide lightning arrester and install it on the drop-type mechanism of the original drop-type fuse, so as to detect, repair, and replace the lightning arrester with an insulating operating rod without power outage. Its disadvantages are that the drop mechanism has a complex structure, high processing cost, and troublesome assembly; the main electrical components are exposed, prone to aging and pollution flashover short circuits, affecting the overall insulation design process; when the lightning arrester body is closed, the elastic piece is compressed and stores energy, prone to fatigue failure, and when the disconnector itself fails, it will cause the drop mechanism to fail, leaving the line without lightning protection; the drop mechanism is also installed outdoors on the line crossarm, and the lightning arrester has a relatively short life among overhead line equipment, is easy to damage, and inspection, maintenance, and replacement are prominent problems that are currently troublesome for the power department. Especially, the exposed part of the zinc oxide lightning arrester is made of silicone rubber, and silicone rubber products are prone to aging and cracking, and being pecked by birds in the natural environment, reducing the service life. There are many electrical connection points, that is, there are many electrical fault points, which also affect the overall line insulation and aesthetics; there is no fixed gap setting. Although the damaged lightning arrester body can be removed and replaced with power when it is damaged, the drop-type lightning arrester must be equipped with a disconnector. For lightning protection of overhead distribution lines, lightning arresters with fixed gaps are generally used, and lightning arresters with fixed gaps are not suitable for supporting disconnectors and cannot be used. The integration degree is not high and it is relatively heavy.

[0004] Another type is the chamber lightning arrester, which mainly moves the zinc oxide lightning arrester body indoors from outdoors to reduce the influence of the natural environment on the lightning arrester body; the lightning arrester can be detected, repaired, and replaced with an insulating operating rod. However, there is no fixed gap insulator. With the presence of the fixed gap insulator, the lightning arrester body is not energized under normal operating conditions, and the aging rate of the lightning arrester is greatly reduced; although it has the function of quickly replacing the lightning arrester body with live work, it does not have the function of quickly and simply installing and disassembling the lightning arrester device with live work; the porcelain outer sleeve is heavy and fragile. Once the lightning arrester fails and explodes, the splashing metal oxides and the fragile porcelain outer sleeve are likely to damage other electrical equipment and passers-by, and it is inconvenient for construction when installed at a high place on the line; there is no sealing design between the lightning arrester body and the chamber. After long-term operation, affected by the environment, moisture and salt stains are likely to enter the chamber under harsh climate conditions, especially in areas with a relatively high salt fog concentration along the coast; due to no sealing treatment between the lightning arrester body and the chamber, the lightning arrester body needs to increase the insulation height and creepage umbrella skirt distance, thus increasing the weight. The lightning arrester is prone to falling due to its excessive self-weight, and the overall cost is also too high; the snap-on insulating cover that is easily blown off by the wind cannot achieve true airtight and fully insulated; it is difficult to install a smart detection device for supporting the smart grid. Summary of the Invention:

[0005] The object of the present invention is to overcome the above-mentioned drawbacks, and aims to study a fixed-gap setting that can install or disassemble the overall arrester device under live working conditions only by means of an insulating operating rod, and can quickly separate and repair, plug and replace the arrester body under live working conditions, and has the function of isolating power frequency voltage, and can be hung and installed on the original iron cross-arm of the line. A lightweight rigid PC insulating material with high strength, high electrical performance, good explosion-proof and anti-aging properties, and greatly reduced overall device weight is selected for molding the insulating cavity. The uppermost umbrella skirt is larger than all the lower umbrella skirts. The insulating cavity with the design of large and small umbrellas for rain curtain and pollution prevention has a fully insulated and sealed design both above and below between its inner wall and the arrester body, so that the overall electrical performance of the arrester operating under harsh natural conditions will not be affected.

[0006] To achieve the above object, the live working fully insulated separable hanging fixed-gap arrester device of the present invention includes: detachable line clamps 1, drain wires 2, upper contact pieces 3, hanging connection plates 4, lightweight insulating cavities 5, live working installation brackets 6, upper contact heads 7, upper insulating waterproof piston rings 8, arrester bodies 9, contact rings 10, lower insulating waterproof piston rings 11, separators 12, upper port sealing rings 13, pile head insulating covers 14, sealing rings 15, drain wire connection pile heads 16, fixed-gap insulators 17, contact piece fixing rings 18, contact pieces (19), elastic springs 20, etc. It is mainly applied to prevent lightning strikes and break wires and power frequency follow current tripping of insulated conductors in medium-voltage distribution networks. The live working installation bracket 6 and the detachable line clamp 1 can be used with an insulating operating rod to install or disassemble the device under live working conditions, and can also be used with an insulating operating rod to plug and unplug the separator 12 and the arrester body 9 and other assemblies under live working conditions for quick repair and replacement, reducing the many inconveniences brought by power outages and improving the efficiency of installation and repair; the application of the externally connected fixed-gap insulator 17 can isolate the power frequency voltage of the system when not struck by lightning during normal operation, avoiding the aging of the arrester due to long-term live operation; the hanging installation on the original cross-arm 21 omits the arrester cross-arm and the arrester clamp for the installation chamber, saving costs, increasing the line corridor and aesthetics, and creating conditions for live working.

[0007] One end 4.2 of the hanging connection plate 4 made of metal material is installed at the top of the lightweight insulating cavity 5 and screwed tightly. A sealing ring 13 is padded between the connection parts to prevent water vapor and salt spray from entering and eroding the inside of the lightweight insulating cavity 5 and damaging the sealed environment.

[0008] The other end 4.3 of the bent hanging connection plate 4 is screwed on the sides 6.2 and 6.3 of the live working installation bracket 6, which is convenient for the insulating operating rod to place the live working installation bracket 6 on the existing cross-arm 21 of the line, and then tighten the ring bolt 6.1 with the insulating operating rod. The 6.4 part of the live working installation bracket adopts an anti-loosening design structure to prevent loosening over time. The initial installation of the arrester can achieve live working.

[0009] The lightweight insulating cavity 5 is a tower-shaped structure, and the large and small shed structures are coordinated to meet the creepage distance requirements. The top shed is larger than all the sheds below, which acts as a rain curtain and dirt prevention and prevents sagging icicles from adhering to other sheds. It also has a certain effect of blocking snow, making the insulation of the lightning arrester more reliable under natural disasters.

[0010] The insulation cavity is made of high-strength and excellent insulation performance, good explosion-proof, anti-aging, cost-effective, and UV-resistant lightweight hard PC insulation material injection molding, which greatly reduces the weight of the overall device. The root arc of the large and small sheds is excessively enhanced, which cooperates to enhance the strength of the cavity and plays an explosion-proof role to prevent the arrester from being damaged and shattered. Once the arrester fails and explodes, the splashing metal oxides together with the fragile porcelain jacket can easily cause line grounding faults, harming other electrical equipment and passers-by. It is inconvenient to install it at a high position on the line.

[0011] The lower part of the contact ring 10 is additionally sealed with a lower insulating waterproof piston ring 11 to play an insulating and sealing role to prevent erosion by water vapor and salt mist.

[0012] The upper and lower structures have a certain taper to make the sealing structure between the light insulating cavity 5 and the arrester body 9 better. The structure of the light insulating cavity 5 is narrow at the top and wide at the bottom, so that the arrester body 9 is inserted into the light insulating cavity 5 more and more tightly. The bottom is sealed with a lower insulating waterproof piston ring 11, and an upper insulating waterproof piston ring 8 is installed on the upper part of the arrester body 9 for sealing. It is made of soft and elastic insulating rubber material, which plays both a sealing and insulating role to prevent the high voltage at the top of the arrester body 9 from creeping from the inside of the cavity. Because the inside of the light insulating cavity 5 is a smooth surface, the upper insulating waterproof piston ring 8 is used to seal the inside of the cavity and the arrester body 9, and creeping will be carried out from the outside of the light insulating cavity.

[0013] The end of the drain wire 2 is crimped on the drain wire connecting pile head 16 made of metal material with good conductive performance, and is tightly covered by the pile head insulating cover 14 made of soft and elastic rubber product material to prevent the invasion of wind, rain and moisture.

[0014] The drain wire 2 and the high-voltage line are installed live with the detachable wire clamp 1. The terminal of the drain wire 2 is screwed and connected with the detachable wire clamp. The operating rod can be used to cover the ring bolt during live operation. The detachable wire clamp 1 is conveniently screwed on the high-voltage wire, and the wire does not need to be stripped, so the installation is simple.

[0015] One end of the fixed-gap insulator 17 passes through the hole on the lower side of the light insulation cavity 5 and is hermetically screwed to the contact piece fixing ring 18, with a sealing ring in between for sealing to prevent wind, rain and moisture intrusion. The air gap between the high-voltage and low-voltage electrodes of the fixed-gap insulator 17 is set at 45±5 mm to ensure that the air gap can be broken down during lightning strikes, and the gap plays the role of isolating the power frequency voltage in the system during normal operation.

[0016] The side of the contact ring 10 made of a metal material with good electrical conductivity is distributed with screw holes, and the separator 12 can be screwed to form an integral body with the contact ring 10, which is convenient for replacement and maintenance.

[0017] The contact piece fixing ring 18 made of a metal material with good electrical conductivity has uniformly distributed screw holes at the bottom for fixing the contact piece 19. The contact piece 19 made of a metal material with good electrical conductivity and good elasticity makes a tight, elastic and constant electrical contact with the contact ring 10 to ensure normal current conduction.

[0018] The elastic spring 20 is looped around the contact piece 19 to tighten it, preventing the contact piece from becoming loose and not tightly clamped due to poor elasticity over time.

[0019] The outer diameter of the lower end of the arrester body 9 is closely matched with the inner wall of the contact ring 10. The bottom metal electrode of the arrester body 9 and the end of the contact ring 10 are in close electrical contact through screwing. The bottom end of the arrester body 9 is conical, and the softness of the silicone rubber outer sleeve is used to make the connection more compact and firm, and the screwing is correspondingly closely fitted. The contact ring 10 and the separator 12 are connected as a whole through a conical tightening and sealing structure by screwing. The separator 12 is made of a high-strength anti-ultraviolet PC insulating material; the lower part of the separator is conical for guiding, and symmetric cylindrical plugging and unplugging operation locks are provided at the waist. A lower insulating waterproof piston ring 11 is tightly fitted in a sealed manner between the lower end of the contact ring 10 and the separator 12. When inserting the arrester body assembly, the lower insulating waterproof piston ring 11 is driven. It is made of a soft and elastic rubber product, and its outer edge has a dynamic fit with the inner wall of the light insulation cavity 5 for waterproof and insulating sealing, playing a role in sealing to prevent the erosion of water vapor and salt mist. The light insulation cavity 5 is injection molded from an anti-UV grade PC rigid insulating material, and the root arc of the umbrella skirt is enhanced. Brief Description of the Drawings:

[0020] Figure 1 It is the structural diagram of the live working fully insulated separable hanging fixed-gap arrester of the present invention.

[0021] Figure 2 It is the structural diagram of the pile head insulating cover, sealing ring and lead wire connection pile head of the present invention.

[0022] Figure 3 It is the structural diagram of the upper contact, upper insulating waterproof piston ring, arrester body, contact ring and lower insulating waterproof piston ring of the present invention.

[0023] Figure 4 This is the structural diagram of the upper insulating and waterproof piston ring and sealing ring of the present invention.

[0024] Figure 5 This is the structural diagram of the hanging connecting plate of the present invention.

[0025] Figure 6 This is the structural diagram of the live working installation bracket of the present invention. Specific implementation method:

[0026] The live working fully insulated separable hanging type fixed gap lightning arrester device of the present invention includes: detachable clamp 1, drainage wire 2, upper contact piece 3, hanging connecting plate 4, light insulating cavity 5, live working installation bracket 6, upper contact 7, upper insulating and waterproof piston ring 8, lightning arrester body 9, contact ring 10, lower insulating and waterproof piston ring 11, separator 12, upper port sealing ring 13, pile head insulating cover 14, sealing ring 15, drainage wire connection pile head 16, fixed gap insulator 17, contact piece fixing ring 18, contact piece 19, elastic spring 20, etc.

[0027] The lightning arrester body 9 is inserted into the light insulating cavity 5, and the hanging connecting plate 4 is screwed on the top end of the light insulating cavity 5. The hanging connecting plate 4 is bent and screwed on the live working installation bracket 6. One end of the drainage wire 2 is screwed on the connection pile head 16, and the other end is screwed on the detachable clamp 1, then a set of live working fully insulated separable hanging type fixed gap lightning arrester device is assembled. During installation, first use an insulating operating rod to extend into the installation port 6.1 to install the live working installation bracket 6 on the existing cross arm 21 of the line and tighten it, and then use the insulating operating rod to extend into the annular bolt on the detachable clamp to install the detachable clamp 1 on the transmission line.

[0028] When the line is struck by lightning, the lightning current passes through the detachable clamp 1 to the drainage wire 2. The lightning current flows along the drainage wire 2 to the high-voltage arc striking rod part of the fixed gap insulator, breaks down the air gap and flows to the low-voltage arc striking rod and then to the lightning arrester body 9. Under high voltage, the lightning arrester body 9 made of zinc oxide material is in a low-resistance state. The lightning current is conducted to the grounding wire through the hanging connecting plate 4 and the live working installation bracket 6. When the lightning current is discharged to the ground, the lightning arrester body 9 returns to the high-resistance state.

[0029] When the arrester is damaged, the arrester body 9 is pulled out by clamping the operating locks on both sides of the separator 12 with an insulating operating rod, and then the arrester body 9 is replaced with a new one with the operating rod to continue operation. Due to the existence of the external series fixed gap 17, the arrester body 9 can be directly plugged in and out without hanging the bypass ground wire when it is pulled out. The arrester on the traditional line can only be replaced after power failure if it is damaged, or it consumes a lot of manpower and material resources to hang the bypass ground wire for replacement. During the damage period, the arrester cannot protect the line, and power failure will cause certain economic losses, so live working is particularly important.

[0030] Power supply reliability has become an assessment indicator for power companies. Live working on long-distance lines in mountainous areas or densely populated paddy fields has always been a technical challenge. How to effectively reduce the number of power outages and reduce labor intensity? The live working fully insulated detachable hanging fixed gap lightning arrester device can be used for live working during the initial installation. The line insulation level is improved, and the lightning arrester nodes can be fully insulated. The use of the live working mounting bracket 6 makes the live working fully insulated detachable hanging fixed gap lightning arrester device more stable and reliable, especially the bending and clamping design at 6.5 of the upper live working mounting bracket 6 can make the bracket more stable in the horizontal direction to avoid slipping.

[0031] The top of the lightweight insulating cavity 5 is an electrical connection point, which also serves to support and suspend the entire cavity. The lightweight insulating cavity 5 is made of excellent PC material, which has excellent electrical insulation performance, high mechanical strength, excellent explosion-proof performance, good waterproof and stain-resistant performance, and greatly reduces the weight of the overall device. Insulating engineering materials, once an old lightning arrester fails and explodes, the splashing metal oxides together with the fragile porcelain jacket can easily cause line grounding faults, harming other electrical equipment and passers-by, and it is inconvenient to install it at a high position on the line.

[0032] According to national standards, the design of the arrester shed is a structure in which the upper part is larger and the lower part is smaller. The light insulating cavity 5 is designed so that the upper shed is the largest, which can well protect the sheds below. Tests have shown that the first shed is the largest, which can better prevent surface flashover, especially for blocking electrical channels formed by rain curtains, icicles, and snow.

[0033] The application of the fully insulated detachable hanging fixed gap lightning arrester device for live working can realize live working after the initial installation, and there is no need to cut off the power supply for the subsequent maintenance and replacement of the lightning arrester body 9, which increases the insulation level of the line and provides a guarantee for more stable operation of the line.

[0034] The light insulating cavity 5 is made of hard high-strength PC material, which can prevent birds from tearing and pecking at it. Especially in recent years, the environment has improved and the number of birds has increased, which has caused certain damage to the operation of the line.

[0035] The purpose of this design is as follows: greatly reduce the weight and enhance the explosion-proof performance; the fully insulated and sealed design improves the insulation level of the circuit; the installation, disassembly, maintenance and replacement of the product can be realized without climbing the pole for fast live working, which can be completed on the ground with the help of an insulated operating rod, reducing the labor intensity and improving the safety of operation and maintenance; because there is a fixed gap isolation system power frequency voltage, the aging of the arrester body 9 caused by the system voltage is avoided, and at the same time, the arrester body 9 can be installed and disassembled without hanging a bypass ground wire. The arrester body 9 is installed in the insulating cavity 5 to avoid the invasion of sunlight, rain and haze, making the arrester more stable and having a longer service life.

Claims

1. A fully insulated separable hanging type fixed-gap lightning arrester device for live working, characterized in that, It includes a live working installation bracket (6), a hanging connection plate (4), a sealing ring (13), a light insulation cavity (5), an upper contact piece (3), a drainage wire connection stub (16), a drainage wire connection stub sealing ring (15), a stub insulation cover (14), a drainage wire (2), a detachable clamp (1), an upper contact head (7), an upper insulating waterproof piston ring (8), a lower insulating waterproof piston ring (11), a contact ring (10), a fixed-gap insulator (17), a contact piece fixing ring (18), a contact piece (19), an elastic spring (20), a lightning arrester body (9), and a separator (12); The upper end of the live working installation bracket (6) adopts a bent clamping design to make the bracket more firm in the horizontal direction and avoid slipping; One end (4.2) of the hanging connection plate (4) is screwed to the top end of the light insulation cavity (5), with the sealing ring (13) padded in between; The other end (4.3) of the bent hanging connection plate (4) is bolted to the side surface of the live working installation bracket (6); The lower part of the contact ring (10) is tightly equipped with the lower insulating waterproof piston ring (11); The fixed-gap insulator (17) passes through the lower side hole of the light insulation cavity (5) and is hermetically screwed to the contact piece fixing ring (18); The bottom electrode of the lightning arrester body (9) presses on the end face of the contact ring (10) to form an electrical contact. The side surface of the contact ring (10) is distributed with screw holes and is screwed and fixed to the separator (12); The bottom end of the contact piece fixing ring (18) is distributed with screw holes for fixing the contact piece (19), and the side surface is provided with screw holes and is screwed to the fixed-gap insulator (17); The elastic spring (20) is hoop-shaped on the contact piece (19); 2. The live working fully insulated separable hanging fixed-gap lightning arrester device according to claim 1, characterized in that: The live working installation bracket (6) can be hung on the original iron cross arm (21) of the line, and the iron cross arm (21) is tightened with a ring bolt (6.1). A spring washer is provided at the top (6.4) of the ring bolt (6.1); 3. The live working fully-insulated separable hanging fixed-gap lightning arrester device according to claim 1, characterized in that: The light insulation cavity (5) is of a tower type structure. The large and small umbrella skirt structures cooperate to meet the creepage distance requirements. The upper umbrella skirt is larger than the next umbrella skirt, then larger and smaller, and the topmost umbrella skirt is larger than all the umbrella skirts below; there is a taper of more than half a degree between the upper and lower inner walls of the cavity.

4. The live working fully-insulated separable hanging fixed-gap lightning arrester device according to claim 1, characterized in that: The upper end of the lightning arrester body (9) is equipped with the upper insulating waterproof piston ring (8), and two sealing rings are installed on it; 5. The live working fully insulated separable hanging fixed-gap lightning arrester device according to claim 1, characterized in that: The drainage wire (2) is crimped on the drainage wire connection stub (16), and the whole is sealed and covered with the stub insulation cover (14); 6. The live working fully insulated separable hanging fixed-gap lightning arrester device according to claim 1, characterized in that: The air gap between the high-voltage and low-voltage electrodes of the fixed-gap insulator (17) is set at 45 ± 5 mm; 7. The live working fully-insulated separable hanging fixed-gap lightning arrester device according to claim 1, characterized in that: The drainage wire (2) is screwed to the detachable clamp (1), and through the operation rod, it is live-worked to be sleeved on the ring bolt, driving the pressure block of the detachable clamp (1) to be installed and hooked on the medium-voltage line; 8. The live working fully-insulated separable hanging fixed-gap lightning arrester device according to claim 1, characterized in that: The separator (12) is screwed and tightly fitted to the conical bottom of the lightning arrester body. The lower part of the separator is conically guided, and symmetric cylindrical plug-and-play operation locks are provided at the waist; 9. The live working fully-insulated separable hanging fixed-gap lightning arrester device according to claim 1, characterized in that: The light insulation cavity (5) is injection molded from an anti-UV grade PC hard insulating material, and the root arc of the umbrella skirt is enhanced;

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