CN210896805U - A structure of a multi-chamber gap arrester with an external air gap - Google Patents

Abstract

The utility model provides an external air gap multi-chamber gap lightning arrester structure, which comprises a ball head hanging ring, a multi-chamber assembly, a connecting insulator assembly, an insulated wire and a puncture wire clamp; the multi-cavity assembly is respectively fastened and connected with the ball head suspension ring and the connecting insulator assembly, the connecting insulator assembly is connected with the puncture wire clamp through an insulated wire, and the ball head suspension ring is fixed on a cross arm of a tower when the multi-cavity assembly is installed and used; the centre gripping of puncture fastener is when distribution lines for insulating wire and distribution lines equipotential are connected. The utility model discloses a connecting wire will go up the mode that multi-chamber and multi-chamber equipotential were connected down, has improved the inhomogeneous situation of potential distribution to guarantee that the thunder and lightning discharge path can not take place the sudden change, multi-chamber subassembly can reliably stabilize the action. The distribution line and the connecting insulator are connected in an equipotential mode through the insulated conducting wire, the multi-chamber assembly is far away from the distribution line, and the accidental discharge phenomenon caused by high voltage introduction due to the fact that the distance is too close to a strong arc blowing and the direction is towards the distribution line is avoided.

Description

A structure of a multi-chamber gap arrester with an external air gap

technical field

The utility model relates to the technical field of overvoltage protection of power transmission and distribution lines, in particular to a multi-chamber gap arrester structure with an external air gap.

Background technique

At present, multi-chamber gap arresters have been popularized and applied in domestic 10kV distribution network lines, and their excellent characteristics such as simple materials, large current capacity, no heat accumulation effect, no operation and maintenance, and long service life are recognized by power system operation and maintenance units. . At present, the multi-chamber gap arrester has been popularized and applied in domestic distribution network lines. Its excellent characteristics such as simple material, large flow capacity, no heat accumulation effect, no operation and maintenance, and long service life are recognized by power system operation and maintenance units. At present, most of the multi-chamber gap arresters used in 10kV distribution network lines are designed with a linear structure, which can meet the requirements of technical performance parameters. However, for the 35kV distribution network line of higher voltage level, the linear structure design causes the length of the body to be too long, which cannot meet the safety distance design requirements of the line tower structure. The spiral or disc structure must be used to compress the multi-chamber gap arrester. length to suit the installation environment conditions. This type of multi-chamber gap arrester disclosed at present has improper design of the multi-chamber body and the main air gap in series, resulting in unreasonable overall voltage gradient distribution of the device, and the main air gap cannot be completely isolated from the power frequency grid voltage under unexpected conditions. The occurrence of line tripping accidents increases the safety risk of line operation.

Invention patent CN105453354A discloses a corona ring arrester. Includes an insulating body, two main electrodes, and two or more intermediate electrodes. The utility model mainly discloses a lightning arrester with the function of avoiding corona discharge. When more than two arresters are used in series, there is a risk that the lower disk chamber is too close to the wire, and the arc blowing effect during lightning current discharge may easily lead to the risk of wire burn; If the difference in potential gradient distribution is too large, once there is a short circuit of floating objects in the air or falling birds, etc., the main air gap will fail, causing the system to trip.

The utility model patent CN206595098 U discloses a combined disc-type multi-gap arrester. Includes glass insulators, multiple disc multi-gap arresters, and multiple main air gaps. The utility model mainly increases the ability to discharge lightning current through the series connection of a plurality of disk arresters. However, there are more than three main air gaps on average, and the distance between each gap is too short, which is prone to short-circuit accidents, and cannot form an effective insulation coordination, which will make the arrester fail and cause the system to trip.

Utility model patent CN 205790938 U discloses a multi-gap lightning protection insulator. Including multi-chamber arc extinguishing system and composite insulator string. The utility model mainly discloses an insulator with lightning protection function. Its multi-chamber arc extinguishing system is composed of a spiral chamber distribution structure, which can extend the chamber and increase the insulation level in a limited geometric size. However, due to the spiral distribution structure, it is easy to form a continuous water surface when raining. , change the discharge path of the lightning and cause the system to trip.

Invention patent CN101981633A discloses a high-voltage insulator, which has both the functions of insulator and arrester. The multi-chamber arc extinguishing system part of the insulator is not provided with a main air gap, but relies on the gap at the top of the insulating cylinder, the multiple series gaps of the spiral chamber and the gap at the bottom of the insulating cylinder to jointly bear the power frequency grid voltage. Short-circuiting of foreign objects or rain and other factors will affect the insulation coordination and cause the arrester to fail.

Therefore, it is necessary to design a multi-chamber gap arrester structure with an external air gap to effectively solve the problems existing in the above applications.

Utility model content

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a multi-chamber gap arrester structure with an external air gap, so as to solve the problems raised in the above technical background.

To achieve the above object, the present invention realizes through the following technical solutions:

A multi-chamber gap arrester structure with an external air gap, comprising a ball head hanging ring, a multi-chamber assembly, a connecting insulator assembly, an insulated wire and a puncture wire clip;

The multi-chamber assembly is respectively tightly connected with the ball head hanging ring and the connecting insulator assembly, and the connecting insulator assembly is connected with the puncture wire clip through an insulated wire,

During installation and use, the ball head hanging ring is fixed on the pole tower cross arm; the puncture wire clip is clamped on the power distribution line, and the insulated wire and the power distribution line are connected by the puncture wire clip to achieve equipotential connection.

Further, the upper end of the ball head hanging ring is connected with the pole and tower cross arm, and the lower end is connected with the multi-chamber assembly.

Further, the multi-chamber assembly includes a support insulator and a bowl head hanging plate;

The upper and lower ends of the supporting insulator are respectively correspondingly connected with the ball head hanging ring and the bowl head hanging plate, and the supporting insulator and the lower end are respectively provided with an upper multi-chamber body and a lower multi-chamber body; The opposite sides of the multi-chamber body and the lower multi-chamber body are connected by connecting wires.

Further, the connecting insulator assembly includes a connecting insulator and a circular hoop;

On the connecting insulator, an upper curved electrode and a downward curved electrode are symmetrically arranged up and down. One end of the upward curved electrode is respectively connected with the connecting insulator and the bowl head hanging plate by bolts, and the other end is a free end. One end of the curved electrode is connected with the circular hoop by bolts, and the other end is the free end. One end of the circular hoop is connected with the connecting insulator, and the other end is connected with the insulated wire; The air gap formed between the free ends of the shaped electrodes is the main air gap.

Further, the angle between the connection line between the free end of the upwardly curved electrode and the free end of the downwardly curved electrode and the gravity line connecting the insulator assembly is α, and α>30°, and the distance between the main air gaps is 170mm～190mm.

The beneficial effects of the present utility model are:

1. The utility model connects the upper multi-chamber and the lower multi-chamber equipotentially by connecting wires, which improves the situation of uneven potential distribution, thereby ensuring that the lightning discharge path will not change abruptly, and the multi-chamber components (that is, the upper The multi-chamber body composed of the multi-chamber body, the connecting wire and the lower multi-chamber body) can operate reliably and stably.

2. The utility model uses the external main air gap to set the main air gap at a position where it is not easy to drop birds and hang floating objects, so as to ensure that the arrester can still isolate the power frequency network voltage stably and effectively in the outdoor complex environment.

3. The utility model uses the method of equipotential connection between the distribution line and the connecting insulator through insulated wires, so that the main body of the arrester (that is, the multi-chamber assembly) is far away from the distribution line, and the distance between the multi-chamber components is too close, and the strong arc blowing towards the direction is avoided. An unexpected discharge phenomenon occurs due to the introduction of high voltage by the distribution line 200 .

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present utility model;

Fig. 2 is the structural diagram of the ball head hanging ring of the present utility model;

3 is a structural diagram of the bowl head hanging plate of the present utility model;

Fig. 4 is the connection structure diagram of the upper multi-chamber body and the lower multi-chamber body in the multi-chamber assembly of the present invention;

5 is a schematic diagram of the lightning current discharge flashover path in the primary lightning strike protection process of the present invention;

Description of reference numbers:

1. Ball head hanging ring; 2. Multi-chamber assembly; 21. Upper multi-chamber body; 211, Upper insulating support frame; 212, Upper conductive support frame; 213, Arc-shaped upper conductive support frame; 22, Lower multi-chamber Chamber body; 221, lower insulating support frame; 222, lower conductive support frame; 223, arc-shaped lower conductive support frame; 23, supporting insulator; 24, connecting wire; 25, ball head hanging plate; 3, connecting insulator assembly; 31 32, connecting insulator; 33, downward bending electrode; 34, main air gap; 35, circular hoop; 4, insulated wire; 5, puncture wire clip;

100, pole and tower cross arm; 200, distribution line; 300, line insulator

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other under the condition of no conflict.

It should be noted that the drawings provided in the following embodiments are only illustrative of the basic concept of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and For dimension drawing, the type, quantity and proportion of each component can be changed at will in actual implementation, and the component layout may also be more complicated.

As shown in Figures 1 to 3, the present invention provides a multi-chamber gap arrester structure with an external air gap, comprising a ball-head hanging ring 1, a multi-chamber assembly 2, a connecting insulator assembly 3, an insulated wire 4 and Puncture wire clip 5. Among them, the multi-chamber assembly 2 is respectively connected with the ball head hanging ring 1 and the connecting insulator assembly 3 through a crimping process, and the connecting insulator assembly 3 is connected with the puncture wire clip 5 through the insulated wire 4. During installation and use, the ball head hanging ring 1 The upper end and the pole and tower cross-arm 100 are fixed in the form of bolt connection, and the multi-chamber gap arrester structure with external air gap is fixed on the pole and tower cross-arm 100; the insulated wire 4 is clamped on the power distribution line 200 by the puncture clip 5, so that the The insulated wire 4 is equipotentially connected to the distribution line 200 , and a line insulator 300 is also fixed on the pole tower cross arm 100 .

Further, as shown in FIG. 1 , the multi-chamber assembly 2 includes an upper multi-chamber body 21 , a lower multi-chamber body 22 , a supporting insulator 23 , a connecting wire 24 and a bowl head hanging plate 25 ; wherein the supporting The upper and lower ends of the insulator 23 are correspondingly connected with the ball head hanging ring 1 and the bowl head hanging plate 25 respectively, and the upper and lower ends of the supporting insulator 23 are correspondingly provided with an upper multi-chamber body 21 and a lower multi-chamber body 22. The upper multi-chamber body 21 and the lower multi-chamber body 22 are both fixed on the support insulator 23 by means of double-bolt connection;

Specifically, as shown in FIG. 4 , the upper multi-chamber body 21 includes a plurality of upper insulating support frames 211 , an upper conductive support frame 212 and an arc-shaped upper conductive support frame 213 , and a plurality of upper insulating support frames 211 and an upper conductive support frame 213 . The upper conductive support frame 212 is fixedly arranged in the arc-shaped upper conductive support frame 212, and a plurality of upper insulating support frames 211, the upper conductive support frame 212 and the arc-shaped upper conductive support frame 213 constitute an upper disc body with a gap, located in the upper disc body with a gap. On both sides of the gap of the upper disc body are an upper conductive support frame 212 and an upper insulating support frame 211 that are fixedly connected to both ends of the arc-shaped upper conductive support frame 213;

The lower multi-chamber body 22 includes a plurality of lower insulating support frames 221, a lower conductive support frame 222 and an arc-shaped lower conductive support frame 223, and the plurality of lower insulating support frames 221 and a lower conductive support frame 222 are fixedly arranged on the arc. In the lower conductive support frame 222, a plurality of lower insulating support frames 221, the lower conductive support frame 222 and the arc-shaped lower conductive support frame 223 constitute a lower disc body with a gap. an upper conductive support frame 222 and an upper insulating support frame 221 fixedly connected to both ends of the arc-shaped lower conductive support frame 223;

The arc-shaped upper conductive support frame 213 in the upper multi-chamber body 21 is provided with the end of the upper insulating support frame 211 and the arc-shaped lower conductive support frame 223 in the lower multi-chamber body 22 is provided with the end of the lower insulating support frame 221 Equipotential connection is realized through the connecting wire 24 on the opposite side of the parts, and the connecting wire 24 can make the upper multi-chamber body 21 and the lower multi-chamber body 22 realize a series relationship through the end equipotential connection, which not only improves the uneven potential distribution. It can also effectively control the lightning flashover path to flow in the direction of the arrow shown in FIG. 5, that is, sequentially from the lower conductive support frame 222, the arc-shaped lower conductive support frame 223, the connecting wire 24, and the arc-shaped upper conductive support frame 213. And the upper conductive support frame 212 is circulated to the ball head hanging ring 1, and then transmitted to the pole tower cross arm 100 by the ball head hanging ring 1, and finally transmitted to the ground by the pole tower cross arm 100, so as to ensure that the lightning strike flashover path is controllable .

Further, as shown in FIG. 1 , the connecting insulator assembly 3 includes a curved electrode 31 , a connecting insulator 32 , a curved electrode 33 , a main air gap 34 and a circular hoop 35 . On the connection insulator 32, an upper curved electrode 31 and a downward curved electrode 33 are symmetrically arranged up and down. One end of the upper curved electrode 31 is respectively connected with the connection insulator 32 and the bowl head hanging plate 25 by bolts, and the other end is At the free end, one end of the downwardly curved electrode 33 is connected with a circular hoop 35 by bolts, and the other end is a free end. One end of the circular hoop 35 is connected to the connecting insulator 32, and the other end is connected to the insulated wire 4; the The air gap formed between the free end of the upper curved electrode 31 and the free end of the lower curved electrode 33 is the main air gap 34, and the main air gap 34 formed by the upper curved electrode 31 and the lower curved electrode 33 is the external The air gap is set in a position where it is not easy to drop birds and suspended floating objects, which can ensure that the arrester can still isolate the power frequency network voltage stably and effectively in the outdoor complex environment. The way of equipotential connection between the distribution line 200 and the connection insulator 32 through the insulated wire 4 can make the multi-chamber assembly 2 far away from the distribution line 200, so as to prevent the multi-chamber assembly 2 from being too close, and the strong arc blowing toward the distribution line The accidental discharge phenomenon caused by the introduction of high voltage caused by 200 occurs.

The angle between the connection line between the free end of the upward curved electrode 31 and the free end of the downward curved electrode 33 and the gravitational line connecting the insulator assembly (the gravitational line refers to the direction of the earth's gravitational force, which is generally vertical to the ground). is α, and α>30°, the design of this angle α can effectively avoid the accidental discharge phenomenon caused by the change of the air insulation distance between the main air gaps 34 caused by the rain falling along the direction of the gravity line, and effectively improve the main air gap 34. Power frequency withstand voltage value, increase operational reliability.

The distance of the main air gap 34 is 170mm˜190mm. The distance between the main air gap 34 is 170mm to 190mm. Too small distance design increases the risk of rainwater connection, and cannot guarantee the overall power frequency wet withstand voltage of the arrester, which affects the safety of power grid operation; the design of this distance can increase the lower multi-cavity The space between the chamber body 22 and the power distribution line 200 can effectively prevent the high voltage potential from touching the power distribution line 200 due to the extensional diffusion of the arc column during the arc blowing process of the multi-chamber assembly 2 for lightning protection. The main body causes the arc path to change, causing a tripping accident. Too large distance design will cause the lightning impulse action voltage of the arrester as a whole to be too high, unable to form a good insulation coordination with the line insulator 300, and unable to effectively control the lightning flashover path and protect the line insulation level.

In the present invention, the connecting wire 24 connects the upper multi-chamber body 21 and the end of the lower multi-chamber body 22 in an equipotential manner, effectively reducing the potential difference between the two, and the potential distribution is relatively uniform. , the main air gap 34 bears most of the power frequency grid voltage, and the upper multi-chamber body 21 and the lower multi-chamber body 22 as a whole bear less voltage, even if due to external disturbance factors such as floating objects, falling birds, Contamination, etc. that cause the upper multi-chamber body 21 and the lower multi-chamber body 22 to be partially short-circuited will not cause the device to malfunction and cause line tripping accidents, which improves the operational reliability of the device.

The working principle of the utility model: when the line generates an overvoltage due to a lightning strike, the overvoltage is conducted to the lower curved electrode 33 through the insulated wire 4, and then the main air gap 34 is caused to break down and flashover, and the overvoltage is conducted to the upper curved electrode 31, The lower multi-chamber body 22 is caused to flash over. Due to the equipotential connection of the connecting wires 24, the overvoltage is conducted to the upper multi-chamber body 21, causing the upper multi-chamber body 21 to flash over, and then released to the ground through the natural grounding body of the tower. The flashover path is shown in the direction of the arrow in Figure 4. The multi-chamber assembly 2 has the characteristics of quickly cutting off subsequent power frequency freewheeling. Through a power frequency freewheeling interruption process, the line insulation level can be quickly restored, so as to discharge the lightning current to the pole tower cross arm 100, and enter the earth through the pole tower cross arm 100. To achieve the purpose of a lightning strike protection.

The above-mentioned embodiments only represent specific embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims (5)

1. The utility model provides an external air gap's multicavity room clearance arrester structure which characterized in that: the device comprises a ball head hanging ring (1), a multi-chamber assembly (2), a connecting insulator assembly (3), an insulated wire (4) and a puncture wire clamp (5); the multi-chamber assembly (2) is respectively fastened and connected with the ball head hanging ring (1) and the connecting insulator assembly (3), and the connecting insulator assembly (3) is connected with the puncture wire clamp (5) through an insulated wire (4);

when the ball head hanging ring is installed and used, the ball head hanging ring (1) is fixed on a tower cross arm (100); puncture fastener (5) centre gripping is on distribution lines (200), and insulating wire (4) realize equipotential with distribution lines (200) through puncture fastener (5) and connect.

2. The external air gap multi-chamber gap arrester structure of claim 1, wherein: the upper end of the ball head suspension ring (1) is connected with the tower cross arm (100), and the lower end of the ball head suspension ring is connected with the multi-chamber component (2).

3. An external air gap multi-chamber gap arrester structure according to claim 1 or 2, characterized in that: the multi-chamber assembly (2) comprises a supporting insulator (23) and a socket hanging plate (25);

the upper end and the lower end of the supporting insulator (23) are respectively and correspondingly buckled and pressed with the ball head hanging ring (1) and the bowl head hanging plate (25), and the upper end and the lower end of the supporting insulator (23) are respectively and correspondingly provided with an upper multi-cavity body (21) and a lower multi-cavity body (22); the opposite sides of the upper multi-cavity body (21) and the lower multi-cavity body (22) are connected through a connecting wire (24).

4. An external air gap multiple chamber gap arrester structure as claimed in claim 3, wherein: the connecting insulator assembly (3) comprises a connecting insulator (32) and a circular hoop (35);

an upper bent electrode (31) and a lower bent electrode (33) are symmetrically arranged on the upper part and the lower part of the connecting insulator (32), one end of the upper bent electrode (31) is connected with the connecting insulator (32) and the socket hanging plate (25) through bolts, the other end of the upper bent electrode is a free end, one end of the lower bent electrode (33) is connected with a circular hoop (35) through bolts, the other end of the lower bent electrode is a free end, one end of the circular hoop (35) is connected with the connecting insulator (32), and the other end of the circular hoop is connected with an insulated wire (4); an air gap formed between the free end of the upper bent electrode (31) and the free end of the lower bent electrode (33) is a main air gap (34).

5. The external air gap multi-chamber gap arrester structure of claim 4, wherein the connecting line between the free end of the upper bent electrode (31) and the free end of the lower bent electrode (33) and the gravity line connecting the insulator assembly form an angle of α, α is greater than 30 degrees, and the distance between the main air gaps (34) is 170 mm-190 mm.

Images