CN201146358Y - Gap lightning protection device - Google Patents

Abstract

The utility model relates to a gap lightning protection device, which belongs to the technical field of lightning protection for electric power system transmission lines, and comprises an arc-resistant insulator, a puncture wire clip and an arc-starting insulated flexible wire. The puncture wire clip penetrates the insulating layer of an overhead insulated wire and It is connected to the internal conductor, and it is characterized in that: the high-voltage end of the arc-resistant insulator is electrically connected to the overhead insulated wire, the grounding end of the arc-resistant insulator is connected to an insulator, and the insulators are respectively equipped with arcs with an arc spacing A. The metal rod and the grounded arc-starting metal rod are electrically connected to the grounding end of the arc-resistant insulator, and the two ends of the arc-starting insulated soft wire are respectively electrically connected to the arc-starting metal rod and the piercing wire clamp. The utility model has the characteristics of low cost of manufacture and use, simple structure, no change of the position of the arc-resistant insulator and the piercing wire clip on the original line, high temperature during discharge will not affect the arc-resistant insulator and the piercing wire clip, and reliable arc starting.

Description

Gap lightning protection device

technical field

The utility model relates to a gap lightning protection device for preventing overhead insulated cables from being broken by lightning, and belongs to the technical field of lightning protection for transmission lines of electric power systems.

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, as disclosed in CN1238864C "Puncture Clamp Insulator for Preventing Lightning Breakage of Overhead Insulated Wires", arc-resistant insulators, puncture wire clamps, and arc-resistant insulators and puncture wire clamps are used. The insulated flexible wires between the piercing wire clips are installed on the overhead insulated wires to pierce the insulation layer of the insulated wires, so that the piercing wire clips are electrically connected with the wires. One end of the insulated flexible wires is installed on the piercing wire clips, and the other end is connected to the arc The high-voltage electrode end of the insulator is electrically connected so that the arc-resistant insulator has the same potential as the puncture clamp. When lightning discharges at high voltage, the arc root of the continuous power-frequency short-circuit current arc is fixed on the high-voltage electrode of the arc-resistant insulator and burns to protect the overhead Insulated wires are protected from burnout. However, this kind of structure leads the high-voltage arc to the arc-resistant insulator, so that the arc root of the continuous-flow power-frequency arc burns on the high-voltage electrode of the arc-resistant insulator, which may easily cause damage to the arc-resistant insulator and affect the reliability of the line work. The "arc-resistant puncture fittings used to prevent lightning breakage of overhead insulated wires" disclosed by CN1481057A adopts puncture wire clips, grounding arc-starting electrodes, arc-resistant electrodes and insulating covers, and the puncture wire clips pierce the insulation layer of insulated wires to The puncture clamp is electrically connected with the wire, the arc-resistant electrode is electrically connected with the puncture clamp, the insulating cover is fixed on the outside of the puncture clamp for insulation and arc limitation, and the ground arc electrode is installed on the ground terminal of the line insulator for electrical connection, so that When lightning occurs, discharge occurs between the puncture wire clamp and the grounded arc-starting electrode, so that the continuous-flow power-frequency arc moves to the arc-resistant electrode for burning, and protects the overhead insulated wire 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. On the other hand, since the arc-resistant electrode is installed on the puncture wire clamp, the continuous-flow power-frequency arc is burnt on the arc-resistant electrode during a lightning strike, and the current intensity of the lightning strike can reach tens of thousands of amperes, and the temperature can reach 20,000 degrees Celsius. The arc-resistant electrode is close to the overhead insulated wire, and the local high temperature will affect the insulation layer of the overhead insulated wire around the piercing wire clip and the piercing wire clip.

Contents of the invention

The purpose of this utility model is to provide a simple structure, low cost, simple structure, do not change the position of the arc-resistant insulator and the puncture line clamp on the original line, the high temperature during discharge will not affect the arc-resistant insulator and the puncture line clamp, and lead Arc reliable gap lightning protection device.

In order to achieve the above technical solution, the utility model is: a gap lightning protection device, including an arc-resistant insulator, a piercing wire clip and an arc-strike insulated flexible wire, and the piercing wire clip penetrates the insulating layer of the overhead insulated wire and connects with the conductive wire inside it. Body connection, characterized in that: the high-voltage end of the arc-resistant insulator is electrically connected to the overhead insulated wire, the grounding end of the arc-resistant insulator is connected to an insulator, and the insulator is respectively equipped with an arc-starting metal rod with an arc-starting distance A and a grounding The arc-starting metal rod, the grounding arc-starting metal rod are electrically connected to the grounding end of the arc-resistant insulator, and the two ends of the arc-starting insulated soft wire are respectively electrically connected to the arc-starting metal rod and the piercing wire clamp.

In the utility model, an insulator is connected to the grounding end of the arc-resistant insulator, and the insulator has an arc-starting metal rod and a grounding arc-starting metal rod. The arc-strike insulated flexible wire is connected to the arc-strike metal rod, so when lightning strikes, the lightning arc energy can be transferred from the overhead insulated wire to the arc-start metal rod through the puncture clamp and the arc-start insulated soft wire in a very short time. The arc is caused by breaking down the arc starting distance, and the grounding terminal of the arc-resistant insulator is connected to the ground, so as to protect the overhead insulated conductor and the arc-resistant insulator from damage. The utility model installs the arc-starting metal rod and the grounding arc-starting metal rod on the insulator, and the insulator mainly bears its own weight, so the endurance requirement is much lower than that of conventional arc-resistant insulators, which not only reduces the manufacturing cost, but also does not damage Line insulation. Because the insulator, the arc-starting metal rod and the grounding arc-starting metal rod are connected into one structure, the utility model has a simple structure, no omissions during construction and installation, and can improve the construction efficiency. Even if it is damaged by high temperature, it only needs to be removed and replaced, and the use cost is low. . Because the utility model does not change the installation position of the arc-resistant insulator and the puncture wire clip on the original overhead insulated line, only the insulator is installed on the grounding end of the lower part of the arc-resistant insulator, and the arc-starting insulated flexible wire is connected to the puncture wire clip and the lead wire. On the arc metal rod, it is very convenient for the online transformation of the lightning protection of the existing overhead insulated line, and has good usability and economy. The utility model adopts the arc-starting insulated soft wire to connect the arc-starting metal rod and the puncture wire clip, not only the arc-starting metal rod is moved to the lower part of the arc-resistant insulator, but also the distance between the discharge burning point and the puncture wire clip and the overhead insulating wire is increased, and the discharge The high temperature at the time will not affect the puncture wire clamp and the overhead insulated wire, and when the overhead insulated wire is shaken by external force, the insulated arc starting soft wire that plays the role of connection will not be restrained, so that the puncture part of the wire in the puncture wire clamp will not damage, to ensure the reliability of lightning protection. The arc striking distance of the utility model is determined by the arc striking distance between the arc striking metal rod installed on the insulator and the grounding arc striking metal rod, and the reliability of the arc striking is guaranteed because it will not be affected by other external forces.

Description of drawings

Embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings.

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

Among them: 1-overhead insulated wire, 2-arc-resistant insulator, 3-horizontal sheet, 4-grounding arc metal rod, 5-insulator, 6-arc metal rod, 7-arc insulated flexible wire, 8-puncture wire folder.

Detailed ways

As shown in Figure 1, the gap lightning protection device of the present utility model includes an arc-resistant insulator 2, a piercing wire clip 8 and an arc-strike insulated flexible wire 7, and the piercing wire clip 8 is installed on the overhead insulated wire 1, and penetrates the overhead insulation The insulating layer of the wire 1 connects the piercing clamp 8 to the conductor of the overhead insulated wire 1, and the high voltage end of the arc-resistant insulator 2 is connected to the overhead insulated wire 1, and the grounding end of the arc-resistant insulator 2 is connected to the insulator 5, the insulator 5 is connected to the grounding end of the arc-resistant insulator 2 through the horizontal sheet 3 and fasteners. In order to reduce the volume of the insulator 5, the insulator 5 is provided with multiple skirts to increase the creepage distance, and the insulator 5 is also equipped with lead wires respectively. The arc metal rod 6 and the grounding arc starting metal rod 4, the two ends of the arc starting insulated soft conductor 7 are respectively connected with the arc starting metal rod 6 and the piercing wire clamp 8, and the overvoltage during lightning strike is insulated from the overhead insulated wire 1 through the arc starting The soft wire 7 and the arc starting metal rod 6, and the arc starting distance A between the arc starting metal rod 6 and the grounding arc starting metal rod 4, the arc starting distance A is between 20 and 200mm, and the arc energy is broken down to strike the arc The gap A triggers an arc, which is connected to the ground through the grounding end of the arc-resistant insulator 2, so as to protect the overhead insulator wire 1 and the arc-resistant insulator 2 from damage.

The utility model can effectively control the arc striking distance A for different voltage levels, the arc striking metal rod 6 installed on the insulator 5 can be adjusted axially along the insulator 5, and the connecting part of the arc striking metal rod 6 is provided with a via hole, The connecting part of the insulator 5 is provided with threads, and the locking nut connects the arc-starting metal rod 6 to the insulator 5, and an adjusting gasket is arranged between the insulator 5 and the arc-starting metal rod 6 . The grounding arc starting metal rod 4 of the utility model installed on the insulator 5 can also be adjusted axially along the insulator 5. Similarly, the connecting part of the grounding arc starting metal rod 4 is provided with a via hole, and the connecting part of the insulator 5 is provided with a screw thread. The tightening nut connects the grounding arc starting metal rod 4 on the insulator 5, and an adjusting gasket is arranged between the insulator 5 and the grounding arc starting metal rod 4.

When the overhead insulated conductor 1 is struck by lightning, the lightning overvoltage passes through the overhead insulated conductor 1, the puncture wire clamp 8 and the arc-strike insulated soft conductor 7 to the arc-strike metal rod 6, and the lightning overvoltage on the overhead insulated conductor breaks down the arc The distance A triggers the arc, so that the continuous flow power frequency arc moves to the arc starting metal rod 6 for burning, and leads to the earth through the grounding end of the arc-resistant insulator 2, so that the lightning arc energy is transferred from the overhead insulated wire in a very short time , so as to protect the overhead insulated conductors from damage.

Claims (5)

1; a kind of clearance lightning-proof protective device; comprise arc resistance insulation (2); penetrating cable clamp (8) and striking insulating soft wire (7); penetrating cable clamp (8) penetrates the insulating barrier of suspended insulated guide wire (1) and is connected with its inner electric conductor; it is characterized in that: the high-pressure side of described arc resistance insulation (2) is electrically connected with suspended insulated guide wire (1); the earth terminal of arc resistance insulation (2) is connected with insulator (5); striking metal bar (6) and ground connection striking metal bar (4) with striking spacing A are housed respectively on the insulator (5); ground connection striking metal bar (4) is electrically connected with the earth terminal of arc resistance insulation (2), and the two ends of striking insulating soft wire (7) are electrically connected with striking metal bar (6) and penetrating cable clamp (8) respectively.

2, clearance lightning-proof protective device according to claim 1 is characterized in that: described insulator (5) is connected the earth terminal of arc resistance insulation (2) by horizontal single (3) and securing member.

3, clearance lightning-proof protective device according to claim 1 and 2 is characterized in that: the outer rim of described insulator (5) is provided with 3～6 full skirts that increase creepage distance.

4, clearance lightning-proof protective device according to claim 1 is characterized in that: the described striking metal bar (6) that is installed on the insulator (5) can be along insulator (5) axial adjustment.

5, clearance lightning-proof protective device according to claim 1 is characterized in that: the described ground connection striking metal bar (4) that is installed on the insulator (5) can be along insulator (5) axial adjustment.