CN203747241U - Air gap lightning arrester - Google Patents

Abstract

The utility model discloses an air gap lightning arrester, and belongs to the technical field of lightning arresters. The air gap lightning arrester comprises a lower electrode, an upper electrode and a lightning arrester member. The lower electrode is fixed on a high voltage wire, the upper electrode is connected with the lower end of the lightning arrester member, the upper end of the lightning arrester member is fixed on a support which is connected with a high voltage transmission tower arm, an air gap is formed between the lower electrode and the upper electrode, and the air gap is connected in series with the lightning arrester member to form the air gap lightning arrester. The air gap lightning arrester can protect AC extra-high voltage power transmission lines, the lightning flashover rate is reduced, the discharging dispersibility of the air gap is small, and the air gap lightning arrester is flexible in installation way, and can be installed on a power transmission line tower conveniently.

Description

An air gap arrester

technical field

The utility model belongs to the technical field of lightning arresters, in particular to an air gap lightning arrester.

Background technique

In the transmission line, as an important overvoltage protection device, the arrester is installed on the transmission tower and connected in series and parallel with the line insulator to limit the lightning overvoltage of the transmission line and reduce the lightning flashover rate. With the development of the national economy, the requirements for the reliability of power supply continue to increase. Since the lightning area of the transmission line is much larger than that of the substation, the probability of being struck by lightning is much greater than that of the substation. With the continuous expansion of the power grid, tripping and blackout accidents caused by transmission lines are increasing. Due to the overvoltage characteristics of AC EHV transmission lines and the particularity of installing arresters on transmission lines, as well as the maintenance-free requirements, ordinary arresters cannot meet the requirements of lightning protection and installation on AC EHV transmission lines.

Utility model content

In order to overcome the above defects in the prior art, the purpose of this utility model is to provide an air gap arrester, which has a simple structure, is easy to install, can effectively protect the insulator strings of AC transmission lines, and reduce the lightning flashover rate.

The utility model is realized through the following technical solutions:

An air-gap lightning arrester includes a lower electrode, an upper electrode and a lightning arrester element, the lower electrode is fixed on a high-voltage wire, the upper electrode is connected to the lower end of the lightning arrester element, and the upper end of the lightning arrester element is fixed on a bracket connected to the arm of a high-voltage transmission tower, An air gap is formed between the lower electrode and the upper electrode, and the air gap is connected in series with the arrester element to form an air gap arrester.

The air gap lightning arrester is connected in series and parallel with the insulator arranged between the high voltage wire and the tower arm of the high voltage transmission tower.

The distance between the insulator string and the lightning arrester element is 2.6m-2.8m.

A counter for recording the number of operations of the arrester is also arranged on the support, and the high-voltage end of the counter is connected with the upper end of the arrester element through a wire.

The air gap arrester may include 2 to 4 arrester elements.

Zinc oxide resistors are used as the resistors in the arrester element, the inner cavity of the arrester is potted with silicone rubber, and the jacket is an umbrella skirt made of silicone rubber.

The shape of the lower electrode and the upper electrode can be circular or elliptical, and the upper electrode has a radian.

Both the lower electrode and the upper electrode are made of aluminum alloy round tubes.

The upper end of the lightning arrester element is connected with an insulating hanger, and the insulating hanger is connected with the bracket.

Compared with the prior art, the utility model has the following beneficial technical effects:

An air gap is formed between the lower electrode and the upper electrode of the utility model, and the air gap is connected in series with the arrester element to form an air gap arrester. Protect the insulator string of AC ultra-high voltage transmission line, reduce the lightning flashover rate, and the dispersion of the discharge in the gap is small, the installation method is flexible, and it is easy to install on the transmission line tower.

Further, a counter is also provided on the support, and the high-voltage end of the counter is connected to the arrester element through a wire. The counter can also have a wireless transmission function of the arrester action times, and can wirelessly transmit the action times of the arrester elements to the signal receiving device.

Furthermore, the shape of the upper electrode is designed to have a radian, which is designed to ensure that the distance between the lower electrode and the upper electrode can be kept within a specified range when the high-voltage wire swings.

Description of drawings

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

Among them: 1 is the lower electrode; 2 is the upper electrode; 3 is the arrester component; 4 is the insulating pendant; 5 is the bracket; 6 is the counter; 7 is the high-voltage wire; 8 is the insulator string;

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail:

Referring to Fig. 1, the air gap lightning arrester of the present invention includes a lower electrode 1 and an upper electrode 2, the shape of the lower electrode 1 is circular or elliptical, the upper electrode 2 has a radian, and both the lower electrode 1 and the upper electrode 2 are made of aluminum Made of an alloy tube; an air gap is formed between the lower electrode 1 and the upper electrode 2, and the arrester element 3 is connected in series with the air gap formed by the lower electrode 1 and the upper electrode 2 to form an air gap arrester; the air gap arrester is connected to the high-voltage wire 7 and the insulator string 8 between the tower arm 9 of the high-voltage transmission pole are connected in parallel. An insulating pendant 4 is connected to the upper end of the arrester element 3 to provide insulation for installing the counter, and the insulating pendant 4 is fixed on the support 5 connected to the tower arm 9 of the high-voltage transmission pole; the lower electrode 1 is installed on the high-voltage wire 7, and the insulator The distance between the string 8 and the arrester element 3 is 2.6m-2.8m. The support 5 is also provided with a counter 6, and the high-voltage end of the counter 6 is connected with the upper end of the arrester element 3 through a high-voltage wire.

The air-gap arrester may include 2 to 4 arrester elements 3, the resistors in the arrester elements are made of zinc oxide resistors, the inner cavity of the arrester is potted with silicone rubber, and the jacket is an umbrella skirt made of silicone rubber.

Claims (7)

1. an air gap arrester, it is characterized in that, comprise bottom electrode (1), top electrode (2) and unit of an arrester (3), bottom electrode (1) is fixed on high-voltage conducting wires (7), top electrode (2) is connected with the lower end of unit of an arrester (3), the upper end of unit of an arrester (3) is fixed on the support (5) being connected with high-voltage power transmission tower tower arm (9), between described bottom electrode (1) and top electrode (2), form air gap, this air gap and unit of an arrester (3) are composed in series air gap arrester; Resistor disc in described unit of an arrester (3) adopts zinc oxide resistance sheet, lightning arrester internal cavities embedding silicon rubber, and overcoat is the full skirt shape overcoat that adopts silicon rubber to make; Described bottom electrode (1) and top electrode (2) be shaped as circle or ellipse, top electrode (2) is with radian.

2. a kind of air gap arrester according to claim 1, is characterized in that, described air gap arrester is with to be arranged on insulator string (8) between high-voltage conducting wires (7) and high-voltage power transmission tower tower arm (9) in parallel.

3. a kind of air gap arrester according to claim 2, is characterized in that, between described insulator string (8) and unit of an arrester (3) at a distance of 2.6m～2.8m.

4. a kind of air gap arrester according to claim 1, it is characterized in that, on described support (5), be also provided for recording the counter (6) of lightning arrestor movement number of times, the high-pressure side of counter (6) is connected with the upper end of unit of an arrester (3) by wire.

5. a kind of air gap arrester according to claim 1, is characterized in that, described air gap arrester comprises 2～4 unit of an arrester (3).

6. according to a kind of air gap arrester described in any one in claim 1～5, it is characterized in that, described bottom electrode (1) and top electrode (2) all adopt tube and pipe of aluminium alloy to make.

7. a kind of air gap arrester according to claim 1, is characterized in that, the upper end of described unit of an arrester (3) is connected with insulation suspension member (4), and insulation suspension member (4) is connected with support (5).