Insulator string deicing structure and deicing method

Abstract

The invention belongs to the field of power transmission line maintenance, and particularly relates to an insulator chain deicing structure and a deicing method.The insulator chain deicing structure comprises an insulator chain body, the insulator chain is formed by sequentially connecting a plurality of insulator discs, a liquid storage groove is formed in the top of each insulator disc, and a liquid storage groove integrated with the body is designed in the top of each insulator disc; before icing, the snow removing agent is preset and stored at the key part of the insulator, so that the insulator can continuously and actively play a role in ice and snow weather, thereby effectively inhibiting the formation and bridging of an ice layer from the source, solving the problems of passivity, short-term effect and low reliability of the traditional method, and improving the reliability of the insulator. And a brand new solution is provided for safe overwintering of the high-voltage transmission line.

Description

Technical Field

[0001] This invention belongs to the field of power transmission line maintenance, specifically relating to an insulator string de-icing structure and de-icing method. Background Technology

[0002] Icing on insulator strings of transmission lines is a serious problem threatening the safe operation of the power grid. In cold regions with rain, snow, and freezing weather, such as... Figure 4 As shown, ice layers easily accumulate on the surface of insulators, and in severe cases, continuous ice bridges may form, leading to a significant decrease in the electrical insulation performance of the insulator string, causing flashover tripping, and even large-scale power outages. Traditional anti-icing and de-icing technologies are mainly divided into passive and active types, but both have significant limitations.

[0003] Passive de-icing primarily relies on optimizing the insulator's structure, such as using a large disc diameter and wide skirt spacing to increase the difficulty of ice bridging, or coating the skirt surface with hydrophobic materials to mitigate icing. However, these methods cannot fundamentally prevent icing and have limited effectiveness in extreme icy and snowy weather. Active de-icing technologies include mechanical de-icing (such as knocking with tools), thermal de-icing (such as melting ice with high current in the line), and chemical de-icing (such as manual spraying or drone-borne de-icing agents). While these methods have some effect, they generally suffer from low efficiency, high energy consumption, poor safety, complex operation, or high economic costs. For example, thermal de-icing requires applying a very large current for a short period, which can impact the power grid and equipment. Summary of the Invention

[0004] To address the above problems, this invention provides an insulator string de-icing structure and de-icing method.

[0005] The objective of this invention is achieved in the following manner: an insulator string de-icing structure, comprising an insulator string body, wherein the insulator string is formed by connecting multiple insulator discs 1 in sequence, and the top of the insulator disc 1 is provided with a liquid storage groove 11.

[0006] Furthermore, the liquid storage groove 11 is an annular groove surrounding the top of the insulator disk 1.

[0007] Furthermore, at least two of the aforementioned annular grooves are coaxially disposed on the top of the insulator disk 1.

[0008] Furthermore, the width of the annular groove is 8mm~15mm, and the depth is 4mm~8mm.

[0009] Furthermore, a protrusion 12 is fixedly connected to the top of the middle part of the insulator disc 1, and a limiting cap 2 is provided on the outside of the protrusion 12. A positioning claw 21 is fixedly connected to the top of the limiting cap 2. A limiting groove 13 is formed inward at the bottom of the protrusion 12. A stop block 31 is provided in the limiting groove 13. The stop block 31 is fixedly connected to the top of the connecting column 3. A limiting disc 32 is fixedly connected to the bottom of the connecting column 3. The limiting disc 32 is used to limit the positioning claw 21.

[0010] Furthermore, a second insulator disk 14 extends outward from the center of the bottom of the insulator disk 1, forming a gap between the second insulator disk 14 and the insulator disk 1.

[0011] Furthermore, the de-icing method includes the following steps: S1. Monitor weather forecast information for the target area; S2. When the forecast information indicates that snowfall or freezing rain will occur within a preset period of time, determine the insulator strings that need to be de-iced. S3. Add or fill the liquid storage groove 11 at the top of the insulator disc 1 of the insulator string with insulating de-icing agent; S4. When snowfall or freezing rain occurs, the insulating de-icing agent stored in the liquid storage groove 11 melts the ice and snow in contact with the groove, forming an anti-icing solution covering layer, thereby preventing ice formation on the surface of the insulator disc 1 or reducing icing.

[0012] Furthermore, in step S3, the solid or liquid insulating de-icing agent is precisely sprayed into the liquid storage groove 11 using a delivery device mounted on a drone.

[0013] Furthermore, in step S3, liquid insulating de-icing agent is sprayed into the liquid storage groove 11 by a fixed-point spraying device installed on the transmission line tower.

[0014] Furthermore, the insulating de-icing agent is an ethylene glycol or propylene glycol solution.

[0015] Compared with existing technologies, this invention designs an integrated liquid storage groove on the top of the insulator disc, which allows for the pre-positioning and storage of de-icing agent in key parts of the insulator before icing occurs. This enables the de-icing agent to function continuously and actively during icy and snowy weather, thereby effectively inhibiting ice formation and bridging from the source. This solves the problems of passive, short-term, and unreliable traditional methods, and provides a brand-new solution for the safe overwintering of high-voltage transmission lines. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the de-icing structure for insulator strings; Figure 2 This is an enlarged view of the top of the insulator string de-icing structure; Figure 3This is a cross-sectional view of the de-icing structure of the insulator string; Figure 4 This is a schematic diagram of ice formation on existing insulator strings.

[0017] Among them, there are insulator disc 1, liquid storage groove 11, protrusion 12, limiting groove 13, limiting cap 2, positioning claw 21, connecting column 3, stop block 31, and limiting disc 32. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In this invention, unless otherwise explicitly specified and limited, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0020] As attached Figure 1-3 As shown, an insulator string de-icing structure includes an insulator string body, which is formed by connecting multiple insulator discs 1 in sequence, and the top of each insulator disc 1 is provided with a liquid storage groove 11.

[0021] As attached Figure 2 As shown, the liquid storage groove 11 is preferably an annular groove arranged around the central axis of the insulator disc 1. A more preferred embodiment is to have at least two such annular grooves coaxially arranged on the top of the same insulator disc 1 to increase the storage capacity of the de-icing agent and expand the anti-icing coverage area. The width of the annular groove is preferably 8mm to 15mm, and the depth is preferably 4mm to 8mm. For example, an insulator disc with a diameter of 320mm can have two grooves: an inner groove 10mm wide and 5mm deep, and an outer groove 12mm wide and 6mm deep. This size range ensures sufficient agent capacity to cope with continuous snowfall without excessively weakening the mechanical strength of the skirt, and is also easy to manufacture.

[0022] The cross-sectional shape of the groove 11 can be arc-shaped, trapezoidal, or rectangular. In embodiments where a complete annular shape is not emphasized, the groove 11 can also be a discontinuous arc segment or an array of multiple independent pits, as long as it can effectively store liquid. The surface of the groove 11 can be treated with a hydrophobic or hydrophilic coating to achieve different effects such as "locking in the agent" or "promoting the spread of the agent," respectively.

[0023] Furthermore, a protrusion 12 is fixedly connected to the top of the middle part of the insulator disc 1, and a limiting cap 2 is fitted around the protrusion 12. A positioning claw 21 is fixedly connected to the top of the limiting cap 2. A limiting groove 13 is formed inward at the bottom of the protrusion 12, and a stop block 31 is provided in the limiting groove 13. The stop block 31 is fixedly connected to the top of the connecting column 3, and a limiting disc 32 is fixedly connected to the bottom of the connecting column 3. The limiting disc 32 is used to limit the connection of the positioning claw 21. When the upper and lower insulator units are connected, the positioning claw 21 of the upper insulator is restricted between the limiting disc 32 and the limiting cap 2 of the insulator, thereby achieving a load-bearing connection and allowing a certain deflection angle.

[0024] The bottom of the insulator disc 1 extends outward from the center to form a second insulator disc 14, with a gap between the second insulator disc 14 and the insulator disc 1. An annular gap is formed between the second insulator disc 14 and the main body of the upper insulator disc 1. This gap increases the creepage distance and prevents arc bridging. In this invention, the anti-icing function of the liquid storage groove 11 effectively prevents ice from bridging this gap.

[0025] The above-described connection structure is merely an example of a connection method that can achieve anti-loosening and rotation. In other embodiments, a traditional ball-and-socket connection structure can also be used, in which the steel ball head of the upper unit is inserted into the steel cap cup head of the lower unit, and the liquid storage groove 11 is designed on the steel cap or nearby umbrella skirt.

[0026] The present invention also includes a preventive de-icing method used in conjunction with the above-described structure, the process of which is as follows: S1. Meteorological monitoring and early warning: The meteorological monitoring system obtains real-time weather forecast information for the target transmission line area, focusing on parameters such as temperature, humidity, and precipitation type (snow, freezing rain, etc.).

[0027] S2. Anti-icing target determination: When forecast information indicates that weather conditions that may cause insulator icing will occur in a specific period of the future, such as within 6-24 hours, the operation and maintenance system automatically or manually determines the line sections and specific insulator strings that need to be de-iced.

[0028] S3. Preventive material feeding operation: Before snowfall or freezing rain begins, add insulating de-icing agent into the liquid storage groove 11 at the top of each insulator disc 1 of the target insulator string.

[0029] Method 1: Drone Deployment. A drone equipped with a storage tank and spraying or solid particle spreading device flies to the target insulator and sprays liquid de-icing agent or spreads solid de-icing agent particles inside. This method is flexible and suitable for complex terrain.

[0030] Method 2: Point-to-point spraying. On towers in areas prone to icing, a remotely or automatically controlled point-to-point spraying device is pre-installed. Upon receiving an instruction, the nozzle is aimed at the insulator string, precisely spraying the liquid de-icing agent into the liquid storage grooves 11 of each layer of insulator discs.

[0031] Chemical Selection: The preferred insulating de-icing agent is an aqueous solution of ethylene glycol or propylene glycol. Although they possess some toxicity, given that large transmission towers are typically located in remote, sparsely populated areas, and that preventative use allows for controlled dosage and precise targeting, the environmental risks are manageable. They are chosen primarily for their low freezing point, good de-icing effect, relative stability, and moderate cost. The amount added should be controlled to prevent excessive overflow from the groove.

[0032] On the other hand, ethylene glycol and propylene glycol are extremely expensive and are generally only used in special applications such as automotive antifreeze or airport runways. In complex environments, they may be diluted or mixed with impurities, leading to increased conductivity. Therefore, they are usually not used as de-icing agents for large-scale roads and power lines. However, they are suitable for large transmission towers in remote, sparsely populated areas.

[0033] S4. Continuous Anti-icing Process: During subsequent snowfall or freezing rain, the de-icing agent pre-stored in the liquid storage groove 11 begins to function. Snowflakes or raindrops falling into the groove mix with the de-icing agent to form a solution with a lower freezing point. This solution melts the ice and snow it comes into contact with and slowly overflows from the groove, forming a protective liquid film on the upper surface of the insulator disc 1. This mechanism effectively delays or prevents ice from forming a continuous ice bridge on the umbrella skirt surface, especially in the gap between the insulator disc 1 and the second insulator disc 14, thereby protecting the critical creepage distance and preventing flashover accidents caused by decreased insulation performance.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. An insulator string de-icing structure, characterized in that: It includes an insulator string body, which is composed of multiple insulator discs (1) connected in sequence, and the top of the insulator disc (1) is provided with a liquid storage groove (11).

2. The insulator string de-icing structure as described in claim 1, characterized in that: The liquid storage groove (11) is an annular groove surrounding the top of the insulator disc (1).

3. The insulator string de-icing structure as described in claim 2, characterized in that: At least two of the annular grooves are coaxially disposed on the top of the insulator disc (1).

4. The insulator string de-icing structure as described in claim 2, characterized in that: The width of the annular groove is 8mm~15mm and the depth is 4mm~8mm.

5. The insulator string de-icing structure as described in claim 1, characterized in that: The top of the middle part of the insulator disc (1) is fixedly connected to the protrusion (12), and the protrusion (12) is fitted with a limiting cap (2) on the outside. The top of the limiting cap (2) is fixedly connected to the positioning claw (21). The bottom of the protrusion (12) forms a limiting groove (13) inward. A stop block (31) is provided in the limiting groove (13). The stop block (31) is fixedly connected to the top of the connecting column (3). The bottom of the connecting column (3) is fixedly connected to the limiting disc (32). The limiting disc (32) is used to limit the connection of the positioning claw (21).

6. The insulator string de-icing structure as described in claim 5, characterized in that: The bottom of the insulator disc (1) extends outward from the middle to form a second insulator disc (14), and a gap is formed between the second insulator disc (14) and the insulator disc (1).

7. The de-icing method for the insulator string de-icing structure as described in any one of claims 1-6, characterized in that, The method includes the following steps: S1. Monitor weather forecast information for the target area; S2. When the forecast information indicates that snowfall or freezing rain will occur within a preset period of time, determine the insulator strings that need to be de-iced preventively; S3. Add or fill the liquid storage groove (11) on the top of the insulator disc (1) of the insulator string with insulating de-icing agent; S4. When snowfall or freezing rain occurs, the insulating de-icing agent stored in the liquid storage groove (11) melts the ice and snow in contact with the groove, forming an anti-icing solution covering layer, thereby preventing ice formation on the surface of the insulator disc (1) or reducing icing.

8. The de-icing method as described in claim 7, characterized in that: In step S3, the solid or liquid insulating de-icing agent is sprayed onto the liquid storage groove (11) at a fixed point using a delivery device carried by the drone.

9. The de-icing method as described in claim 7, characterized in that: In step S3, the liquid insulating de-icing agent is sprayed into the liquid storage groove (11) by a fixed-point spraying device installed on the transmission line tower.

10. The de-icing method as described in claim 7, characterized in that: The insulating de-icing agent is an ethylene glycol or propylene glycol solution.

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