A foreign matter blocking device for a power transmission line insulator string

Abstract

The utility model discloses a kind of insulator string foreign matter blocking devices of transmission line, it is related to the field of insulator.This device includes fixed plate and umbrella-shaped shielding cover, fixed plate side is equipped with opening, umbrella-shaped shielding cover is equipped with at least two openings, one of umbrella-shaped shielding cover's opening is same with the direction of fixed plate side opening.Opening of fixed plate side and the opening of umbrella-shaped shielding cover are forced to open, and lose force is automatically closed.The utility model provides a kind of high-strength insulator foreign matter blocking device that can be installed in high place with point, improves power grid safety.

Description

Technical Field

[0001] This utility model relates to the field of insulators, and in particular to a foreign object blocking device for insulator strings of transmission lines. Background Technology

[0002] Currently, overhead transmission lines play a crucial role in my country's power transmission system. Their primary function is to efficiently transmit electricity from power generation facilities (such as power plants or renewable energy power stations) to substations and users, ensuring that power supply meets societal demand. Simultaneously, by connecting power plants, substations, and users, they form a unified power system, enabling complementary and optimized power allocation, improving system efficiency and stability, facilitating the exchange and distribution of power between different regions, and alleviating supply-demand imbalances. Furthermore, they adjust current distribution during peak electricity consumption periods to prevent localized overloads and ensure system safety. Insulators are indispensable key components in transmission lines. Their core function is to block abnormal current paths, ensuring electrical isolation between conductors and towers or the ground. They are made of highly insulating materials (such as ceramics, glass, or composite materials), capable of withstanding high voltage without conducting electricity, preventing current leakage that could lead to power loss or short-circuit accidents. The structure of an insulator consists of its external shape (umbrella-shaped) and internal structure. The external shape is related to external insulation characteristics such as pollution accumulation and flashover voltage, while the internal structure is related to the safety of the internal insulation. In actual operation, the operating environment of insulators in the field is quite harsh. For example, due to the improvement of the ecological environment, birds are more and more active on the towers. Bird droppings on the surface of the insulators cause a sharp decline in insulation performance, forming a discharge channel and causing a short circuit to ground. In addition, in windy weather, foreign objects such as plastic film in the field can get tangled on the insulator strings under the action of wind, causing the creepage distance to shorten or fail, forming a discharge path and causing a short circuit to ground. These transmission line faults often cause serious events such as power grid instability, power outages for users, grid disconnection, and the expansion of the power outage area and the excessive duration of the outage.

[0003] Currently, the main preventative measures against faults caused by foreign objects on insulators are to install bird deterrents and bird-proof barriers above the insulators, but these measures are not very effective.

[0004] Chinese Patent Publication No. CN104200935U discloses a protective umbrella skirt and an insulator assembly having the protective umbrella skirt. The protective umbrella skirt includes at least two umbrella sleeves joined together to form a locking hole, and a connector detachably connecting adjacent umbrella sleeves. Both the umbrella sleeves and the connectors are insulating, and the connectors are distributed from the end of the umbrella sleeve closest to the locking hole to the end furthest from the locking hole. However, this type of umbrella sleeve is difficult to install and cannot be installed on insulators at high locations. Utility Model Content

[0005] The present invention aims to provide a protective cover that can be installed on top of an insulator string to shield the insulator, prevent foreign objects and bird droppings from creeping onto the insulator, and shorten the creepage distance. At the same time, this protective cover is easy to install, can be directly installed above the insulator at a high position, and is not easy to fall off the insulator.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A foreign object blocking device for insulator strings of transmission lines includes a fixing plate and an umbrella-shaped shield. The fixing plate has an opening on its side, and the umbrella-shaped shield has at least two openings. One of the openings of the umbrella-shaped shield is in the same direction as the opening on the side of the fixing plate.

[0008] Preferably, the umbrella-shaped shield has reinforcing ribs distributed on it.

[0009] Preferably, the fixing plate is provided with fixing pin holes.

[0010] Preferably, the fixing pin holes are located on the left and right sides of the opening on the side of the fixing plate.

[0011] Preferably, at least two fixing hooks are provided below the umbrella-shaped shield.

[0012] Preferably, the fixing hook and the opening are on the same side, and the fixing hook is a U-shaped slot structure, so that the insulator skirt can be inserted into the fixing hook after installation.

[0013] Preferably, the fixing plate is a hollow cylinder.

[0014] Preferably, the diameter of the umbrella-shaped shield is greater than or equal to 45 centimeters.

[0015] Preferably, the opening on the side of the fixing plate and the opening of the umbrella-shaped shield open under force and close automatically when the force is lost.

[0016] This invention provides a protective cover that reduces the probability of foreign objects adhering to or entangled on the insulator string; it can be directly installed on insulators at high locations without disassembling the insulators, thus protecting electrical safety. Reinforcing ribs improve the structural strength of the protective cover. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a bottom view of the utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Umbrella-shaped shield 2. Opening 3. Reinforcing rib 4. Fixing plate 5. Fixing pin hole 6. Fixing hook. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] This utility model employs an insulating mounting base that fits onto the insulator cap socket. Then, an automatic retraction structure is used to automatically fix the blocking device onto the insulator skirt. This achieves the purpose of increasing space protection at the top of the insulator string and increasing the creepage distance of the insulator string, thereby reducing the probability of faults caused by discharge paths formed on the surface of the insulator string due to foreign objects entanglement, bird droppings, etc.

[0022] Example 1, by Figure 1 This utility model provides a foreign object blocking device for insulator strings of transmission lines. The device includes a fixing plate 4 and an umbrella-shaped shield 1. The umbrella-shaped shield 1, which provides shielding, is connected to the lower end of the fixing plate 4. As the fixing plate is installed, the umbrella-shaped shield forms an umbrella structure, creating a 360° protective space above the insulator string. The fixing plate 4 has an opening on its side, which is closed when not under force, and the two sides of the opening overlap. The umbrella-shaped shield 1 has an opening 2 in the same direction, which is also closed when not under force, and the two sides of the opening overlap. During installation, an outward force is applied to the left and right sides of the two openings to open them, allowing the shield to fit over the top of the insulator. After the force is released, the openings automatically close. In this embodiment, the size of the openings can vary from -15° to 45° under force. In addition to opening 2, the umbrella-shaped shield has at least one other opening on the other side of the umbrella, allowing opening 2 to open.

[0023] The fixing plate 4 is provided with fixing pin holes 5. After the fixing plate is installed on the cap socket of the insulator, corresponding fixing pins and pin holes are reserved on the plate surfaces on both sides of the mounting plate. During the process of the fixing plate shrinking and tightening, the fixing pins on the fixing plate are inserted from one end into the pin holes at the other end to achieve the fixed connection of the fixing plate to the insulator cap socket. In this embodiment, the fixing pin holes on both sides of the side opening of the fixing plate 4 are single-hole structures. In order to enable the fixing plate to adapt to different types of insulator strings, the length of the fixing plate can also be made into an adjustable structure, and the fixing pin holes at one end of the fixing plate can be designed into multiple rows to realize the automatic expansion and contraction of the fixing plate according to the diameter of the cap socket.

[0024] The fixing plate 4 is a hollow cylinder. In this embodiment, the fixing plate 4 has a diameter of 6 cm and a height of 7 cm. The fixing plate is a hollow cylinder with a diameter of 6 cm and a height of 7 cm. The side opening design allows for elastic deformation within a range of -15° to 45°. The fixing pin holes on both sides of the opening adopt a compatible design of single hole and multi-row combination. The single hole structure is suitable for standard insulator cap sockets, while the multi-row combination hole adapts to cap sockets of different diameters by adjusting the insertion position of the fixing pin (e.g., the diameter difference of cap sockets for 70kN-160kN insulators can reach 20%), solving the problem of poor versatility of traditional fixing devices.

[0025] The umbrella-shaped shield 1 is umbrella-shaped, allowing foreign objects to slide off the canopy when they land on it. To ensure adequate protection, the diameter of the umbrella-shaped shield should be greater than or equal to 45 cm. To ensure the strength of the canopy, reinforcing ribs are distributed throughout the umbrella-shaped shield; in this embodiment, there are eight reinforcing ribs. The umbrella-shaped shield has a diameter ≥ 45 cm, and the eight radial reinforcing ribs are arranged radially. They are made of high-strength epoxy resin material with a thickness of 3 mm, achieving a bending strength of 120 MPa and withstanding the impact of foreign objects at wind speeds of 50 m / s. The shield has a double opening: the main opening 2 faces the same direction as the fixed plate opening, while the auxiliary opening on the other side uses an arc-shaped cut design. Through the principle of mechanical leverage, the auxiliary opening elastically deforms synchronously when the main opening opens, ensuring the symmetry of the shield when unfolded and preventing installation misalignment. The canopy tilt angle is 15° to 45°, ensuring that foreign objects such as bird droppings can slide off the canopy.

[0026] The overlapping structure on both sides of the opening of the fixing plate adopts a "wedge-shaped interlocking + elastic reset" design: when no force is applied, the edges on both sides of the opening are tightly fitted by 0.5 mm wedge-shaped flanges to form a sealing ring; during installation, an outward expansion force is applied, the wedge-shaped structure unlocks, and the maximum expansion angle of the opening reaches 45°. After the insulator cap is inserted, the restoring force of the elastic material causes the opening to close automatically, and the fixing pin hole is precisely aligned. The fixing pin is made of 3 mm diameter stainless steel, and after being inserted into the pin hole, it forms a double locking of "interference fit + inertial locking", with a pull-out force ≥500N, ensuring that the device will not loosen under long-term vibration.

[0027] like Figure 2As shown, a fixing hook 6 is provided below the umbrella-shaped shield 1. There are at least two fixing hooks; in this embodiment, there are four. Two fixing hooks are provided on each of the left and right sides of the opening 2, and the fixing hooks are on the same side as the opening 2, meaning the position of the fixing hooks does not exceed the vertical line of the opening 2. This ensures that after installation, if the device is subjected to a pulling force towards the opening, the fixing hooks can prevent the device from being pulled out, preventing accidental detachment. The fixing hook structure is a U-shaped groove, which facilitates the installation of the blocking device onto the insulator without displacement and allows for smooth engagement with the side of the insulator skirt, achieving quick engagement between the fixing plate and the insulator. After the device is fitted onto the top of the insulator, the edge of the insulator skirt can engage with the fixing hook, allowing the blocking device to be securely installed above the insulator. The four U-shaped fixing hooks below the umbrella-shaped shield are symmetrically distributed, each hook having a depth of 2 cm and an opening width of 1.5 cm, which precisely matches the typical thickness of the insulator skirt (1.2-1.8 cm). The position design of the fixed hook follows the principle of mechanical balance: the angle between its center line and the perpendicular line of opening 2 is no greater than 80°.

[0028] In this embodiment, the opening width is 8cm to match the diameter of the insulator cap socket during installation. When the opening is expanded, the maximum width can reach 12cm, making it compatible with different models.

[0029] The fixing plate, umbrella-shaped shield, etc. are all made of high-strength, high-pressure-resistant, high-toughness, and anti-aging materials to meet the requirements of the device to withstand wind and sun exposure all day long.

[0030] In the operation of high-voltage transmission lines, insulator strings, as critical insulation components, are frequently susceptible to insulation performance degradation and even short-circuit faults due to factors such as bird activity and entanglement with foreign objects. Traditional bird-proofing measures, such as bird deterrents and bird barriers, have significant limitations: bird deterrents only physically prevent birds from nesting, but cannot intercept foreign objects such as wires and branches carried by birds from falling, and are even less able to prevent bird droppings from accumulating directly on the insulator surface; while bird barriers can catch some nesting material, they cannot solve the problem of foreign objects rolling onto the insulator or bird droppings spilling out. These defects significantly increase the risk of surface discharge along the insulator, especially in rainy and bird-prone areas, leading to frequent line tripping accidents and seriously affecting the reliability of power grid operation. Pole-end clamps are mostly rigid structures, which are not adaptable to the different skirt curvatures of different insulator models (such as bell-type and three-umbrella type), resulting in an installation failure rate of up to 25%.

[0031] Example 2: In transmission lines with voltage levels of 110kV and above, insulator strings are usually suspended at a height of 20-50 meters. Their installation environment faces three physical limitations: the safe distance between the insulator string and the tower and conductor increases with the voltage level (e.g., ≥5 meters for 500kV lines), but when working on live lines, operators need to complete the installation in a limited space of only 1-2 meters. The operating range of tools is limited by the distribution of strong electric fields, and conventional robotic arms are difficult to position accurately.

[0032] The insulator's shed structure (shed diameter 25-40cm) is multi-layered and overlapping. When installing the protective cover, it must pass through the gaps between the sheds. Traditional rigid tools are prone to damaging the glaze of the sheds due to impact, leading to a risk of partial discharge. This utility model provides a door-frame type insulation installation tool. Considering the characteristics of the circular fixing plate, a three-sided frame with a width greater than the diameter of the fixing plate is constructed, allowing the fixing plate to be accommodated within the frame. Adjustable mounting pins are installed on the two sides of the unclosed frame. These mounting pins, acting on the mounting holes on the circular fixing plate, allow the circular fixing plate to unfold. A screw connecting component is connected to one side of the frame for connecting an insulating rod.

[0033] As a key insulating component of high-voltage transmission lines, insulator strings exhibit a typical hierarchical design in their physical structure. They are composed of disc insulators connected in series as basic units. A single disc insulator consists of insulating porcelain, metal fittings, and a glued structure. The insulating porcelain is shaped like an umbrella skirt, with the upper umbrella surface convex and concave to extend the creepage distance, while the lower umbrella surface is concave to form a drip groove for rainwater to drip off. The porcelain material is made of high-strength alumina ceramic and glazed to enhance its insulation performance. The metal fittings include a bowl-shaped iron cap at the top and a columnar steel foot at the bottom. The iron cap and steel foot are connected by a ball joint, allowing the insulator string to deflect flexibly. The space between the iron cap and the porcelain is filled with sulfur adhesive and sealed with silicone rubber to prevent moisture penetration. Multiple insulators are connected in series by fittings such as ball-head hanging rings and cup-head hanging plates. When the suspension string is suspended vertically, it consists of 7-10 insulators. When the tension string is installed horizontally, the number of insulators increases and both ends are fixed by right-angle hanging plates. For insulator strings of 220kV and above lines, equalizing rings are also added to both ends to distribute the electric field evenly. In the entire string structure, the spacing between adjacent insulators is 5-8cm. The skirts are arranged alternately to form a “convex and concave” waveform. With the help of accessories such as counterweights and vibration dampers, it can resist the effects of wind, vibration and other external forces in high-altitude environments. At the same time, the design of alternating large and small skirts and coating with anti-pollution flashover coating improves the anti-pollution flashover capability and adapts to the insulation requirements under different climate and terrain conditions.

[0034] This device uses an insulating rod and a frame-type installation tool on top of the rod. The installation tool is used to open the fixing plate of this device in advance through the installation hole. Then, the insulating rod is used to deliver this device to the part above the insulator string that connects to the tower body hardware. After the fixing plate is inserted into the bottom of the cap end of the insulator and the fixing hook is inserted into the bottom of the skirt of the insulator, the bow-shaped tool is disengaged from the installation hole. The fixing plate loses force and automatically resets and closes. During the reset process, the fixing pin hole and the lock on the fixing plate automatically engage and lock due to inertia, thus achieving installation and fixation.

[0035] Pre-installation stage: Use the insulating rod to deliver the door frame tool to the top of the insulator, adjust the installation pin to open the fixed plate opening to 30°, at this time the opening 2 of the umbrella-shaped shield opens simultaneously, the other openings of the umbrella-shaped shield close, and the shield structures on both sides of the other openings overlap.

[0036] Positioning stage: Align the device with the insulator cap socket and slowly lower it until the fixing hook is engaged with the edge of the umbrella skirt. Use the laser positioner at the end of the insulating rod to ensure that the fit error between the fixing hook and the umbrella skirt is ≤2 mm.

[0037] Locking Phase: After removing the installation tools, the fixing plate closes under the action of elastic restoring force, and the fixing pin automatically inserts into the pin hole due to inertia, completing the locking process with a "click". The entire process can be completed within 3 minutes, avoiding the drawback of traditional bolt fixing requiring power outages, and is suitable for uninterrupted maintenance scenarios.

[0038] This invention relates to a live-lined foreign object blocking device, comprising a circular fixing plate and an umbrella-shaped shield connected to the fixing plate, which holds a suspension insulator in place. A locking structure is installed on the fixing plate, and the locking mechanism automatically locks and secures the insulator.

[0039] As can be seen from the above technical solution, compared with existing bird deterrents, the main function of the bird deterrent is to occupy space and prevent birds from building nests on top of the insulator string. However, it cannot prevent foreign objects such as wires carried by birds from falling onto the porcelain insulator, nor can it prevent bird droppings from spilling onto the insulator string. This invention does not have these shortcomings when foreign objects or bird droppings fall onto the blocking device. Due to the umbrella-shaped structure, these foreign objects or bird droppings will automatically slide down the slope of the umbrella shape, away from the insulator, effectively preventing the insulation of the insulator from decreasing along the surface, resulting in better protection and a wider protection range.

[0040] As can be seen from the above technical solution, compared with existing bird-proof barriers, the main function of bird-proof barriers is to prevent bird nests from being easily caught on them, such as branches and wires. However, they cannot prevent birds from falling onto porcelain insulators or droppings onto insulator strings. This invention does not have these shortcomings. When foreign objects or bird droppings fall onto the barrier, these shortcomings are eliminated. Due to the umbrella-shaped structure, the foreign objects or bird droppings will automatically slide down the slope of the umbrella shape, away from the insulator, effectively preventing the insulation of the insulator from decreasing. This results in better protection and a wider protection range.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A foreign object blocking device for insulator strings of transmission lines, characterized in that, It includes a fixing plate (4) and an umbrella-shaped shield (1). The fixing plate (4) has an opening on its side, and the umbrella-shaped shield (1) has at least two openings. One of the openings (2) of the umbrella-shaped shield is in the same direction as the opening on the side of the fixing plate.

2. A device for preventing foreign objects from entering a string of insulators of a power transmission line according to claim 1, characterized in that, The umbrella-shaped shield (1) has reinforcing ribs (3) distributed on it.

3. A device for blocking foreign objects from a string of insulators of a power transmission line according to claim 1, characterized in that, The fixing plate (4) is provided with fixing pin holes (5).

4. A device for preventing foreign objects from entering a string of insulators of a power transmission line according to claim 1 or 3, characterized in that The fixing pin holes (5) are located on the left and right sides of the side opening of the fixing plate (4).

5. A foreign object blocking device for transmission line insulator strings according to claim 1, characterized in that, At least two fixing hooks (6) are provided below the umbrella-shaped shield (1).

6. A foreign object blocking device for transmission line insulator strings according to claim 5, characterized in that, The fixing hook (6) and the opening (2) are on the same side. The fixing hook is a U-shaped slot. After installation, the insulator skirt is inserted into the fixing hook.

7. A device for blocking foreign objects from a string of insulators of a power transmission line according to claim 1, characterized in that, The fixing plate (4) is a hollow cylindrical shape.

8. A device for blocking foreign objects from a string of insulators of a power transmission line according to claim 1, characterized in that, The diameter of the umbrella-shaped shield (1) is greater than or equal to 45 cm.

9. A device for preventing foreign objects from entering a string of insulators of a power transmission line according to claim 1, characterized in that, The opening on the side of the fixed plate (4) and the opening (2) of the umbrella-shaped shield open under force and close automatically when the force is lost.

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