CN201298720Y - A lightning protection device - Google Patents

Abstract

The utility model discloses a lightning protection device, which comprises an arc-resistant insulator and a puncture wire clip, the high-voltage end of the arc-resistant insulator is connected with an insulated wire, and the puncture wire clip penetrates the insulating layer of the insulated wire and is in contact with the conductor inside. Connection, the grounding end of the arc-resistant insulator is connected to the insulator, and the other end of the insulator is connected to the puncture clamp; the insulator is a retractable insulating rod, and an arc-starting metal rod with an arc-starting distance A is arranged at both ends of the insulating rod It is connected with the grounding arc starting metal rod, the arc starting metal rod is connected with the piercing wire clamp, and the grounding arc starting metal rod is connected with the grounding end of the arc-resistant insulator; and at least two umbrella groups are arranged on the insulator. The insulator of the utility model is a retractable insulating pull rod, and a plurality of umbrella groups are arranged on the insulating pull rod, so that the creepage distance can be increased, and the insulator is not easily broken down under the condition of super high voltage.

Description

A lightning protection device

technical field

The utility model belongs to the technical field of lightning protection for electric power system transmission lines, in particular to a lightning protection device for preventing insulated cables from being broken by lightning.

Background technique

Power systems such as 10KV or 20kV distribution overhead lines mostly use insulated overhead wires. In order to prevent lightning from breaking overhead insulated wires, CN1481057A discloses "arc-resistant puncture fittings for preventing overhead insulated wires from being broken by lightning." The clamp pierces the insulation layer of the insulated wire to electrically connect the piercing wire clip to the wire, and the arc-resistant electrode is electrically connected to the piercing wire clip. The insulating cover is fixed on the outside of the piercing wire clip for insulation and arc limitation. The ground terminal of the insulator is electrically connected, so that when lightning occurs, discharge occurs between the piercing wire clamp and the ground arc-starting electrode, so that the continuous current power-frequency arc moves to the arc-resistant electrode for burning, and protects the overhead insulated conductor from being burned. The arc-resistant puncture fitting of this structure discharges through the discharge distance between the grounded arc-starting electrode and the arc-resistant electrode when lightning strikes, because the arc-resistant electrode is installed on the puncture clamp, and the grounded arc-starting electrode is installed on the line insulator On the one hand, the installation and construction are all high-altitude operations. Since the arc striking distance between the arc-resistant electrode on the piercing wire clip and the grounding arc striking electrode on the line insulator cannot be guaranteed, especially in lightning weather and wind and rain, the overhead insulated wire will shake. However, changing the arc striking distance reduces the reliability of lightning protection. In order to solve the above problems, the arc striking metal rod and the grounding arc striking metal rod are often used to change the arc striking distance, but this cannot increase the creepage distance. Under such circumstances, if there is an ultra-high voltage, it is easy to cause the insulator to be broken down, causing danger.

Contents of the invention

The purpose of the utility model is to provide a lightning protection device with adjustable arc striking distance.

In order to achieve the above object, the utility model adopts the following technical solutions:

The utility model comprises an arc-resistant insulator and a puncture wire clip, the high-voltage end of the arc-resistant insulator is connected with the insulated wire, the puncture wire clip penetrates the insulation layer of the insulated wire and is connected with the conductor inside it, the ground end of the above-mentioned arc-resistant insulator is connected with the The insulator is connected, and the other end of the insulator is connected with the puncture clamp; the insulator is a retractable insulating rod, and the two ends of the insulating rod are provided with an arc starting metal rod with an arc starting distance A and a grounding arc starting metal rod to start the arc. The metal rod is connected with the piercing clamp, and the grounding arc starting metal rod is connected with the grounding end of the arc-resistant insulator; and at least two umbrella groups are arranged on the insulator.

There are six umbrella groups on the insulator.

The above-mentioned insulator is connected to the grounding end of the arc-resistant insulator through horizontal sheets and fasteners.

The above-mentioned piercing wire clip is connected with the metal bar of the arc through the wire.

In the utility model adopting the above-mentioned technical solution, since an insulator is connected to the grounding end of the arc-resistant insulator, the insulator is connected with an arc-starting metal rod and a grounding arc-starting metal rod, and the grounding arc-starting metal rod is electrically connected to the grounding end of the arc-resistant insulator , the metal rod for starting the arc is connected with the puncture wire clip, so when the lightning strikes, the lightning arc energy can be transferred from the overhead insulated wire through the puncture wire clip to the metal rod for starting the arc in a very short time, and the arc is broken down to cause the arc. The grounding terminal of the arc-resistant insulator is connected to the earth, so as to protect the overhead insulated conductor and the arc-resistant insulator from damage. The arc starting distance is determined by the arc starting distance between the arc starting metal rod installed on the insulator and the grounding arc starting metal rod. Since it will not be affected by other external forces, the reliability of the arc starting is guaranteed. In addition, in the utility model, the insulator is a stretchable insulating pull rod, and a plurality of umbrella groups are arranged on the insulating pull rod, so that the creepage distance can be increased, and the insulator is not easily broken down in the case of ultra-high voltage.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model.

Detailed ways

As shown in Figure 1, the utility model includes an arc-resistant insulator 3 and a puncture wire clamp 2, the high-voltage end of the arc-resistant insulator 3 is connected to the insulated wire 1, and the puncture wire clip 2 penetrates the insulation layer of the insulated wire 1 and connects with the conductive wire inside it. body connected.

The grounding end of the above-mentioned arc-resistant insulator 3 is connected to the insulator 7 through a horizontal sheet 8 and fasteners. The two ends of the insulator 7 are provided with an arc-starting metal rod 4 and a grounding arc-starting metal rod 5 with an arc-starting distance A. The metal rod 4 is connected to the piercing wire clamp 2 through the wire 9, and the grounding arc-starting metal rod 5 is connected to the ground terminal of the arc-resistant insulator 3, which can lead the overvoltage from the insulated wire 1 to the arc-starting metal rod 4 during a lightning strike, thereby causing There is an arc starting distance A between the arc metal rod 4 and the grounding arc starting metal rod 5, and the arc starting distance A is controlled between 20-200mm, and the arc energy is broken down through the arc starting distance A to start the arc, and the arc resistance insulator 3 The ground terminal is connected to the earth, so as to protect the insulated wire 1 and the arc-resistant insulator 3 from being damaged.

In order to reduce the volume of the insulator 7 and increase the creepage distance, the insulator 7 in the utility model is a retractable insulating pull rod. The above-mentioned insulating pull rod is made of two bushings with different diameters. The casing moves in the large-diameter casing, and a limiting device is arranged in the large-diameter casing. The above-mentioned insulating rods are well known to those skilled in the art. In addition, at least two umbrella groups 6 are provided on the insulator 7, and the number of umbrella groups 6 can be set according to actual needs. Six umbrella groups 6 are arranged on the insulator 7 of the present utility model, as shown in FIG. 1 . In this way, adjusting the axial length of the insulating pull rod can not only adjust the arc striking distance A, but also adjust its creepage distance, so that even in the case of ultra-high voltage, it is not easy to break down the insulator 7 .

When the insulated wire 1 is struck by lightning, the lightning overvoltage passes through the insulated wire 1, the puncture wire clamp 2 to the arc-starting metal rod 4, and the lightning overvoltage on the insulated wire 1 breaks down the arc-starting distance A to cause an arc, and passes through the arc-resistant insulator The ground terminal of 3 is led to the earth, and the lightning arc energy is transferred from the insulated wire 1 in a very short time, and the insulated wire 1 is protected from damage.

Claims (4)

1, a kind of lightning protection device, it comprises arc resistance insulation (3) and penetrating cable clamp (2), the high-pressure side of described arc resistance insulation (3) links to each other with insulated conductor (1), described penetrating cable clamp (2) penetrates the insulating barrier of insulated conductor (1) and is connected with its inner electric conductor, it is characterized in that: the earth terminal of described arc resistance insulation (3) is connected with insulator (7), and the other end of insulator (7) is connected with penetrating cable clamp (2); Described insulator (7) is telescopic insulated tension pole, be provided with striking metal bar (4) and ground connection striking metal bar (5) with striking spacing A at the two ends of insulated tension pole, described striking metal bar (4) links to each other with penetrating cable clamp (2), and described ground connection striking metal bar (5) links to each other with the earth terminal of arc resistance insulation (3); And on insulator (7), be provided with at least two cluster parachutes (6).

2, a kind of lightning protection device according to claim 1 is characterized in that: be provided with six cluster parachutes (6) on described insulator (7).

3, a kind of lightning protection device according to claim 1 is characterized in that: described insulator (7) is connected the earth terminal of arc resistance insulation (3) by horizontal single (8) and securing member.

4, a kind of lightning protection device according to claim 1 is characterized in that: described penetrating cable clamp (2) is connected with striking metal bar (4) by lead (9).

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