CN201430407Y - Lightning-proof shielding and lightning-inducing device for single lightning conductor for power transmission wire - Google Patents

Abstract

The utility model relates to a single lightning protection wire lightning shielding lightning protection device for power transmission wires. A lightning protection wire is installed between adjacent transmission towers. ~ 4 conductive clamps, and an insulating sleeve type lightning rod is fixed on each conductive clamp. A steel rod counterweight is fixed on the lower end of the clamp to keep the lightning rod upward and perpendicular to the lightning conductor. The lightning conductor and a section of the lightning conductor at its installation form an inverted "cross" shape. The utility model has the advantages of simple structure and low cost, and adopts an insulating tube type lightning rod with stronger lightning guiding ability and a lightning conductor to form a lightning guiding device with a larger protection range, so as to reduce lightning damage tripping and further improve the lightning protection effect of the line , to solve the technical problem of line tripping caused by lightning shielding conductors.

Description

Lightning-proof shielding and lightning-inducing device for single lightning conductor for power transmission wire

technical field

The utility model belongs to the technical field of lightning protection for power transmission lines, in particular to a single lightning protection line lightning shielding and lightning protection device for power transmission wires.

Background technique

At present, in order to protect the conductors of transmission lines from being struck by lightning, it is generally used to erect lightning conductors. my country's electric power industry standard DL/T 620-1997 "Overvoltage Protection and Insulation Coordination of AC Electrical Installations" stipulates in Article 6.1.2: 110kV along Lightning protection lines should be erected along the entire line. In mountainous areas and areas with particularly strong lightning activities, it is advisable to erect lightning protection lines along the entire line. The structure of the lightning conductor is shown in Figure 1: a bare steel strand is installed on the top of the left transmission tower 1 and the right transmission tower 5 above the three-phase transmission conductor 3, and the exposed steel strand is both the lightning conductor 2 , the lightning conductor is conducted through the transmission towers on both sides and the ground 6 . However, due to the lack of lightning induction capacity of the existing lightning protection lines, after the transmission lines have adopted various conventional lightning protection measures, there are still many lightning trips on the transmission lines. According to the statistics of the number of trips, among the number of trips caused by various reasons, the number of trips caused by lightning occupies the first place in the total number of trips. For example: "High Voltage Technology" No. 1, 2008, Yi Hui's "my country's transmission line operation status and lightning protection" article gives the 2002-2004 national power grid fault statistics table, the total number of line trips caused by 9 reasons Among the 231 cases, 129 trips due to lightning occurred, accounting for 55.8% of the total, ranking first; another example: from 2005 to 2007, there were 442 trips of overhead transmission lines above 35kV in Beijing Electric Power Company, of which 198 trips occurred due to lightning, accounting for 198 of the total. 44.8%, also ranked first. The statistical results of transmission line operation show that the trip rate caused by lightning shielding in plain areas is basically the same as the trip rate caused by counterattack; while in mountainous areas, due to the complex terrain, the influence of slope angle, the large span span, and the wind blowing, the lightning protection The swing of the wire and the conductor increases, and even the conductor and the lightning conductor swing in the opposite direction, so that the horizontal distance between the lightning conductor and the conductor increases, that is, the protection angle of the lightning conductor to the conductor becomes larger, resulting in a larger shielding rate than a counterattack rate much. For example: "High Voltage Technology" No. 6, 1998, Wang Qingjun and Liu Wenhai "Analysis of the Causes of Lightning Trips on 500kV Lines in Anhui" provided that from 2002 to 2003, there were 9 trips due to lightning strikes on 500kV lines in Anhui, accounting for about 70% of the total number of trips , and in 9 lightning trips, 7 times are shielding, and shielding trips account for 78% of lightning trips. The lines where the above-mentioned lightning strike tripping accidents have all been erected with lightning protection lines and adopted various conventional lightning protection technical measures. It can be seen that the existing various lightning protection technical measures cannot guarantee the safe operation of the transmission line.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, to provide a simple structure, low cost, strong ability to attract lightning, large protection radius, which can effectively protect the power transmission wire single lightning protection wire lightning shielding for power transmission wire Lightning device.

The technical scheme that the utility model takes is:

A single lightning protection wire lightning shielding and lightning arresting device for power transmission wires, a lightning protection wire is installed between adjacent transmission poles and towers, and it is characterized in that: 1 to 4 conductive The clips are fixed with an insulating sleeve type lightning rod on each conductive clip.

Moreover, the conductive clamp is composed of an upper clamp plate and a lower clamp plate, and an insulating sleeve-type lightning rod is fixed on the upper clamp plate, and a lightning conductor is clamped between the upper and lower clamp plates. , on the inner walls of the upper and lower clamping plates where the lightning conductor is clamped, there are stripes for locking the lightning conductor.

Moreover, the insulating sleeve-type lightning rod is composed of an upper conductive needle, a cylindrical steel rod, a middle conductive needle and a lower conductive needle in sequence, and the upper conductive needle and the cylindrical steel rod are jointly covered with an insulating sleeve. The insulating sleeve and the upper conductive needle are in clearance fit, and are closely matched with the cylindrical steel rod. The insulating sleeve is provided with drainage holes on the side wall relative to the lower end of the upper conductive needle. The lower end of the lower conductive needle is in contact with the conductive The top surface of the upper clamp plate of the clamp is fixedly connected.

Moreover, a counterweight coaxial with the insulating sleeve type lightning rod is fixed on the lower surface of the lower clamp plate of the conductive clamp.

Moreover, an umbrella-shaped rainproof skirt is fixedly installed on the outer wall of the insulating sleeve.

Advantage and positive effect of the present utility model are:

1. The insulating sleeve type lightning rod in this lightning guiding device is vertically installed on the lightning conductor through a conductive clamp, and the lower end of the insulating sleeve type lightning rod is fixedly connected to the upper end surface of the conductive clamp. The insulating sleeve type lightning rod belongs to the prior art, and it is mainly used in power stations, substations, oil tank farms, microwave towers, flammable, explosive and other important places that are vulnerable to lightning strikes. , its lightning protection range is several times larger than that of ordinary lightning rods, and several times larger than that of lightning conductors. It can effectively solve the lightning damage tripping caused by lightning shielding the transmission wire.

2. In this lightning guiding device, the insulating sleeve-type lightning rod and the lightning conductor are fixed together through a conductive clamp, and the stripes that can lock the lightning conductor are made on the inner wall of the position where the lightning conductor is clamped by the conductive clamp. . This structure can effectively avoid sliding and twisting between the two, and improves overall stability.

3. A counterweight coaxial with the insulating sleeve type lightning rod is installed under the conductive clamp in this lightning guiding device. The function of the counterweight is to keep the insulating sleeve type lightning rod vertically straight up. The counterweight is installed on the bolt column fixed on the lower end of the lower clamping plate and fixed by locking bolts. Its shape is cylindrical and there should be no corners to avoid corona. Its weight is insulating sleeve type 3 to 5 times the total weight of the lightning rod.

4. The insulating sleeve-type lightning rod in this lightning device is composed of upper conductive needle, cylindrical steel rod, middle conductive needle and lower conductive needle in sequence, and an insulating sleeve is set outside the upper conductive needle and cylindrical steel rod. tube, the insulating sleeve is clearance fit with the upper conductive needle, and tightly fitted with the cylindrical steel rod, and the height of the insulating sleeve is higher than the total height of the upper conductive needle and the cylindrical steel rod. The protection angle of the above-mentioned structure is greater than 90°, which can protect objects slightly higher than it.

5. Under economical and reasonable conditions such as mechanical strength, the lightning guiding device can properly increase the height of the insulating sleeve-type lightning guiding rod and install it on the lightning conductor at an appropriate distance from the tower, which can also protect the tower from lightning strikes and make lightning strike the tower The lightning damage tripping caused by "counterattack" is reduced, and the lightning resistance level of the transmission line is greatly improved. Especially for the high soil resistivity, the lightning protection effect of the transmission line in the area where the grounding resistance of the tower is difficult to reduce is more significant.

6. The insulating sleeve-type lightning rod in this lightning guiding device has a particularly strong lightning guiding ability and a large protection range. For high-voltage transmission lines, in each span of the line that is prone to lightning strikes, only the lightning protection needs to be Installing 1 to 4 insulating sleeve-type lightning rods on the line can reliably protect the wires from lightning strikes, so the number of insulating sleeve-type lightning rods required is very small. For a 110kV single lightning conductor line with a standard span of 300m, only two insulating sleeve-type lightning conductors with a height of 3m need to be installed on the lightning conductor of one span, which can fully meet the requirements for shielding protection.

7. The total weight of the insulating sleeve-type lightning rod in this lightning device does not exceed 23kg, which is negligible for the load capacity of the lightning conductor. Its structure is not complicated and the required quantity is small, so its material and Installation costs are lower.

8. The utility model is simple in structure and low in cost. It adopts an insulated tube-type lightning rod with stronger lightning capacity and a lightning conductor to form a lightning device with a larger protection range, which solves the technical problem of circuit tripping caused by lightning shielding the wire , after the trial operation has obtained a satisfactory lightning protection effect, the protection angle of the lightning conductor can be appropriately enlarged when designing a new transmission line, the vertical distance between the lightning conductor and the transmission conductor can be reduced, and the coupling and shielding effect of the lightning conductor can be further exerted Function, improve the lightning resistance level of the line, reduce lightning tripping, and further improve the line lightning protection effect.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of the assembly of the lightning conductor and the insulating sleeve type lightning rod;

Fig. 3 is a sectional view taken along line A-A of Fig. 2 .

Detailed ways

Below in conjunction with embodiment, the utility model is further described, and following embodiment is illustrative, not limiting, can not limit protection scope of the present utility model with following embodiment.

A single lightning protection wire lightning shielding lightning protection device for power transmission wires, as shown in Figures 1 to 3, a lightning protection wire 2 is installed between the adjacent left power transmission tower 1 and the right power transmission tower 5, the present invention The innovation of the utility model is that: 1 to 4 conductive clips are fixedly installed on the lightning conductor at intervals, and an insulating sleeve type lightning rod 2 is fixed on each conductive clamp. In this embodiment, the lightning conductor is installed at intervals on the lightning conductor. There are two conductive clips and two insulating sleeve type lightning rods. The conductive clamp is composed of an upper clamp plate 17 and a lower clamp plate 18 formed by pressing steel plates. The length is 400-700 mm and the thickness is 1-3 mm. Through bolt locking, the same convex curve stripes as the concave curve stripes on the surface of the lightning conductor are made on the inner wall of the upper and lower clamp plates in contact with the lightning conductor, so that the two can be closely occluded and contacted to better prevent conduction Clamp slides and twists. The upper end surface of the upper clamping plate is fixed with the lower end of the insulating sleeve type lightning rod, and the lower end surface of the lower clamping plate is provided with a bolt column 20, and the bolt column is engaged with an insulating sleeve type lightning rod. Coaxial counterweight 19. The counterweight is made of round steel rod or cast iron, and its weight is 3 to 5 times the total weight of the insulating sleeve type lightning rod and other components. Its shape is cylindrical and should not have corners to avoid corona. , its main purpose is to keep the insulating sleeve type lightning rod vertically upward in wind and rain.

The insulating sleeve-type lightning rod is composed of the upper conductive needle 22, the cylindrical steel rod 23, the middle conductive needle 12 and the lower conductive needle 15. The connection relationship of each structure is described below:

The shape of the upper conductive needle, the middle conductive needle and the lower conductive needle is a round rod or a round tube, and the diameters of the three are within the range of φ6-φ15 mm, and the diameters of the three can be equal. The materials of the three can use steel, stainless steel, aluminum alloy or copper. The upper end of the upper conductive needle is a cone with an apex angle of 10-15°, and the total height of the upper conductive needle, the middle conductive needle, the lower conductive needle and the cylindrical steel rod is 0.3-7 meters. Wherein the lower end of the upper conductive needle is welded with a cylindrical steel rod, the lower end of the cylindrical steel rod is welded in the first connecting plate 10, the first connecting plate is fixed together with the second connecting plate 11 by bolts, and the second connecting plate is welded The upper end of the middle conductive pin, the lower end of the middle conductive pin is welded in the third connecting plate 13, the third connecting plate is fixed with the fourth connecting plate 14 by bolts, and the lower end of the conductive pin is welded in the fourth connecting plate The upper end, the lower end of the lower conductive pin is welded to the upper end surface of the upper clamp plate. After installation according to the above structure, the upper, middle and lower conductive pins are in a conductive state with the conductive clamp and the lightning conductor.

Put an insulating sleeve 7 on the upper conductive needle and the cylindrical steel rod, its inner diameter is the same as the outer diameter of the cylindrical steel rod, but 2 to 8 mm larger than the outer diameter of the upper conductive needle, and its height is 10 higher than that of the upper conductive needle. ~40 mm. The insulating sleeve is bonded together with the cylindrical steel rod and the first connecting plate by superglue and locked on the cylindrical steel rod by bolts. The insulating sleeve is made of epoxy glass steel pipe, silicone rubber, high-strength hard plastic or plexiglass, and phenolic tape pipe. A support ring 21 is fixed on the outer wall of the insulating sleeve, and an umbrella-shaped rainproof skirt 9 made of epoxy glass fiber reinforced plastic, silicon rubber, high-strength hard plastic or plexiglass material is fixed on the support ring. . 3～4 drain holes 8 are formed on the side wall of the insulating sleeve relative to the lower end of the upper conductive needle. For easy drainage, the drain holes are through holes inclined at 45° from the insulating sleeve inner wall to the outer wall.

Two support rods 16 are installed between the fourth connecting plate fixed to the upper end of the lower conductive pin and the upper clamping plate, the upper end of which is welded on the fourth connecting plate, and the lower end is welded on the upper end surface of the upper clamping plate , each support rod is a round steel rod of φ4～φ8, and its main purpose is to reduce the torsion force suffered by the conductive needle in the lower section.

Claims (5)

1. A single lightning protection wire lightning shielding and lightning arresting device for power transmission wires. A lightning protection wire is installed between adjacent transmission poles and towers. It is characterized in that: 1 to 4 There are two conductive clips, and an insulating sleeve type lightning rod is fixed on each conductive clip. 2. The single lightning protection wire lightning shielding lightning protection device for power transmission wires according to claim 1, characterized in that: the conductive clamp is composed of an upper clamp plate and a lower clamp plate that are fastened together, The insulating sleeve type lightning rod is fixed on the upper clamping plate, and the lightning protection line is clamped between the upper and lower clamping plates, and the locking lightning protection line is made on the inner wall of the upper and lower clamping plates where the lightning protection line is clamped. stripes. 3. The single lightning protection wire lightning shielding lightning arresting device for power transmission wires according to claim 1, characterized in that: the insulating sleeve-type lightning arrester is composed of an upper conductive needle, a cylindrical steel rod, a middle Conductive needles and lower conductive needles are fixed in sequence. The upper conductive needle and cylindrical steel rod are covered with an insulating sleeve. A drainage hole is formed on the side wall of the tube relative to the lower end of the upper conductive needle, and the lower end of the lower conductive needle is fixedly connected to the upper surface of the upper clamp plate of the conductive clamp. 4. The single lightning protection wire lightning shielding lightning protection device for power transmission wires according to claim 2, characterized in that: the lower surface of the lower clamp plate of the conductive clamp is fixed with an insulating sleeve Type lightning rod coaxial counterweight. 5. The single lightning protection wire lightning shielding lightning protection device for power transmission wires according to claim 3, characterized in that: an umbrella-shaped rainproof skirt is fixed on the outer wall of the insulating sleeve.

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