CN206023208U - A kind of overvoltage protection device - Google Patents

Abstract

The utility model discloses an overvoltage protector, which aims to provide an overvoltage protector with a radially fixed and firm drainage ring, which solves the problem that the drainage ring may rotate when the external wind force is large, and changes the two ends of the drainage ring to the The gap between the insulators affects the lightning protection performance of the overvoltage protector. The key points of its technical solution include a diversion ring and a lightning arrester. The diversion ring is provided with a fixing piece, and the fixing piece is provided with a fixing hole and a plug for fixing with the lightning arrester. Connect to the positioning bump fixed in the positioning hole on the top of the arrester.

Description

A kind of overvoltage protector

technical field

The utility model relates to a lightning protection device for a power grid, in particular to an overvoltage protector.

Background technique

Thunder and lightning are a weather phenomenon that often occurs in summer. Thunder disasters pose a huge threat to natural resources and the environment on which human beings depend, and seriously endanger the safety of power production.

The overvoltage protector is a device for overvoltage protection of high-voltage equipment in the power system. The working principle of the device is as follows: the drainage device of the overvoltage protector is connected in parallel with the insulator. The series gap operation of the line protector reduces the potential difference between the tower arm and the conductor, and ensures that the insulator no longer flashes over, thus avoiding line tripping and power failure. After the series gap action, the residual voltage of the overvoltage protector body is not only limited to be far lower than the internal flashover voltage of the insulator, but also can automatically extinguish the power frequency freewheeling current under the overvoltage system frequency voltage to ensure normal power supply.

The Chinese patent with publication number 202978256U discloses an overvoltage protector, which includes an insulator whose upper end is fixed on the transmission line, the lower end of the insulator is fixedly connected to the lower end of the arrester through a bracket, and the upper end of the arrester is fixed to one end of the diversion ring The other end of the diversion ring is sleeved on the upper part of the insulator in the form of an open ring. Although this kind of overvoltage protector can install a diversion ring between the arrester and the insulator, the series gap formed between the diversion ring and the insulated transmission line and the current limiting element can cooperate to effectively cut off the power frequency continuous current in an instant. , to avoid lightning disconnection accidents on insulated transmission lines and reduce line switch tripping caused by lightning strikes, but the diversion ring may rotate when the external wind is strong, changing the gap between the two ends of the diversion ring and the insulator, affecting overvoltage protection lightning protection performance.

Utility model content

Aiming at the deficiencies in the prior art, the purpose of this utility model is to provide an overvoltage protector in which the diversion ring is radially fixed firmly.

The above-mentioned technical purpose of the utility model is achieved through the following technical solutions: an overvoltage protector, including a diversion ring and a lightning arrester, a fixing piece is arranged on the drainage ring, and an upper connection with the lightning arrester is arranged on the fixing piece. The fixing hole corresponding to the insertion hole is plugged into the positioning protrusion fixed in the positioning hole on the top of the arrester.

Through the above setting, screw the bolt through the fixing hole on the fixing part and fix it on the socket hole of the arrester to fix the axial direction of the drainage ring; insert the positioning protrusion on the fixing part into the fixing hole on the top of the arrester, It plays the role of radially fixing the drainage ring; through the dual radial and axial positioning of the drainage ring, the drainage ring can still maintain stability when it is in the external environment for a long time, and will not be affected by excessive wind or rain. The radial displacement of the diversion ring will affect the lightning protection performance of the overvoltage protector.

It is further set that: the drainage ring includes two drainage half-rings arranged opposite to each other, and the two drainage half-rings are integrated with a hook section, a ring section, and a connecting section in sequence, and the fixing member is fixed to the connecting section.

Through the above settings, it is not necessary to process the drainage ring at one time, and the drainage ring is set into two drainage half-rings to facilitate processing; when the two drainage half-rings are processed, the connecting section of the two drainage half-rings is welded and fixed on the horizontal plane , the two drainage half-rings can be placed on the horizontal plane, so that the gap between the ring segment and the insulator can be the same.

It is further provided that an insulator is further included, the ring segment is sleeved on the outer end of the insulator, and a uniform gap is provided between the inner wall of the ring segment and the outer end of the insulator.

Through the above settings, when the arrester is affected by lightning, the diversion ring transmits the high potential to the insulator through the ring section, and the gap between the ring section and the insulator is uniform, so that the receiving points on the insulator are balanced, the damage to the insulator is reduced, and the insulator is improved. It also increases the maximum voltage that the insulation can withstand, and improves the lightning protection of the overvoltage protector.

It is further set to: further include a mounting bracket for fixedly connecting the insulator and the lightning arrester, the mounting bracket includes a first connecting plate and a second connecting plate in the shape of an L, and the first connecting plate includes a first fixed end and a first The second connecting plate includes a second fixed end and a second connecting end, the insulator is fixed on the first fixed end, the arrester is fixed on the second fixed end, the first connecting end and the second The two connection ends are detachably connected.

Through the above arrangement, the first connecting plate and the second connecting plate are fixed by the first connecting end and the second connecting end, so that no radial displacement occurs between the first connecting plate and the second connecting plate, so that the diversion ring and the insulator The gap between them changes, reducing the performance of lightning protection.

It is further set as: the length direction of the first connection end and the second connection end are evenly provided with connection holes for fixed connection, the length of the first connection end is longer than the length of the second connection end, and the connection holes on the first connection end The number is four, and the number of connection holes on the second connection end is three.

Through the above settings, according to the difference between the insulator and the arrester, the height of the arrester can be adjusted by connecting different connection holes, so that the drainage ring can be adjusted to the appropriate height and the performance of lightning protection can be improved. To the role of radial fixation to prevent rotation.

It is further provided that: the second fixed end is provided with a groove inserted into the bottom of the arrester, and a second protrusion that restricts the rotation of the arrester.

Through the above arrangement, the second protrusion is plugged into the bottom of the arrester, and interferes with the bottom surface of the arrester, restricting the rotation of the arrester; avoiding the rotation of the arrester to drive the rotation of the drain ring, changing the gap between the drain ring and the insulator, and reducing the lightning protection performance.

It is further provided that: the top of the insulator is provided with a wire groove and a wire crimping plate for fixing the transmission line in the wire groove.

Through the above settings, the top of the insulator is fixed on the transmission line through the pressure plate, so that the insulator and the current drainage device are connected in parallel. When the lightning strikes the tower or the lightning protection line, the high potential caused by the lightning current makes the series gap of the line protector work, reducing the tower The potential difference between the arm and the conductor ensures that the insulator will no longer flash over, thereby avoiding line tripping and power failure.

To sum up, the utility model has the following beneficial effects: an overvoltage protector in which the diversion ring is radially fixed firmly.

Description of drawings

Fig. 1 is the front view of present embodiment;

Fig. 2 is the top view of present embodiment;

Fig. 3 is the structural representation of drainage ring in the present embodiment;

FIG. 4 is a schematic structural diagram of the mounting bracket in this embodiment.

Reference signs in the figure: 1, drainage ring; 11, drainage half ring; 111, hook section; 112, ring section; 113, connecting section; 12, fixing piece; 121, fixing hole; 122, positioning bump; 2 , lightning arrester; 3, insulator; 31, crimping plate; 32, trunking; 4, mounting bracket; 41, first connecting plate; 411, first fixed end; 412, first connecting end; 42, second connecting plate ; 421, the second fixed end; 422, the second connection end; 423, the second bump; 43, the connection hole; 5, the transmission line.

detailed description

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

As shown in Figures 1 and 2, an overvoltage protector includes a mounting bracket 4 for fixing the insulator 3 and the lightning arrester 2, the mounting bracket 4 includes a first connecting plate 41 and a second connecting plate 42 in an L shape, and the insulator The bottom of the lightning arrester 2 is fixed on the first fixed end 411, the bottom of the arrester 2 is fixed on the second fixed end 421, and the second fixed end 421 is provided with a second bump 423 that snaps to the bottom of the arrester 2 to prevent the arrester 2 from being affected by the outside world. Rotation occurs due to the action of force; the first connecting end 412 and the second connecting end 422 pass through the connecting hole 43 through two bolts and nuts to fasten and connect radially and fixedly, preventing the first connecting plate 41 from rotating relative to the second connecting plate 42 ; The length of the first connection end 412 is longer than the second connection end 422, four connection holes 43 are provided on the length direction of the first connection end 412, and three connection holes 43 are provided on the second connection end 422, according to the insulator 3 Different from the height connection of the arrester 2 , adjusting the corresponding position of the connection hole 43 plays a role in adjusting the height of the insulator 3 and the arrester 2 .

The transmission line 5 passes through the wire groove 32 on the top of the insulator 3, and then tightens and presses down the pressure plate 31 on the top of the insulator 3 with two bolts, so that the top of the insulator 3 is fixed on the transmission line 5; the top of the arrester 2 is provided with a drainage Ring 1, the bolts pass through the fixing hole 121 on the fixing part 12 and screw on the arrester 2 to fix the axial direction of the drainage ring 1; the positioning protrusion 122 on the fixing part 12 is plugged into the fixing hole 121 on the top of the arrester 2 , to play the role of radially fixing the diversion ring 1; through the radial and axial double positioning of the diversion ring 1, the ring segment 112 on the diversion ring 1 is sleeved on the outer end of the insulator 3, and connected to the outer end of the insulator 3 Uniform gaps are provided to balance the receiving points on the insulator 3, reduce damage to the insulator 3, and improve the life of the insulator 3.

As shown in Figure 3, the drainage ring 1 includes two drainage half-rings 11 arranged opposite to each other, so it is not necessary to process the drainage ring 1 at one time, which is convenient for processing; The ring section 112, the connecting section 113, the arc-shaped end of one side of the fixing piece 12 is integrally connected to the bottom surface of the connecting section 113, the middle position of the fixing piece 12 is provided with a fixing hole 121, and the arc-shaped end of the other side of the fixing piece 12 A frustum-shaped positioning projection 122 is provided on the bottom surface of the end portion, and the frustum-shaped positioning projection 122 is plugged into the fixing hole 121 on the top of the arrester 2 more firmly.

As shown in Figure 4, the mounting bracket 4 includes a first connecting plate 41 and a second connecting plate 42 in an L shape, the insulator 3 is fixed on the first fixed end 411, the arrester 2 is fixed on the second fixed end 421, the second A connecting end 412 and a second connecting end 422 are fixedly connected by connecting holes 43, wherein the length of the first connecting end 412 is longer than the length of the second connecting end 422, and the number of connecting holes 43 on the first connecting end 412 is four, the second The number of connecting holes 43 on the second connecting end 422 is three.

This specific embodiment is only an explanation of the utility model, and it is not a limitation of the utility model. After reading this description, those skilled in the art can make modifications to the embodiment without creative contribution according to needs, but as long as it is within the utility model All new claims are protected by patent law.

Claims (8)

1. An overvoltage protector comprising a diversion ring (1) and a lightning arrester (2), characterized in that: the diversion ring (1) is provided with a fixture (12), and the fixture (12) is provided with There are fixing holes (121) corresponding to the upper insertion holes of the arrester (2) and positioning projections (122) plugged and fixed in the positioning holes on the top of the arrester (2). 2. The overvoltage protector according to claim 1, characterized in that: the drainage ring (1) includes two symmetrically arranged drainage half-rings (11), and the drainage half-rings (11) include sequentially connected hook segments (111), an annular segment (112), and a connecting segment (113), the fixing member (12) is fixed to the connecting segment (113). 3. The overvoltage protector according to claim 2, characterized in that: it also includes an insulator (3), the ring segment (112) is sleeved on the outer end of the insulator (3), and the ring segment (112) There is a uniform gap between the inner wall of the insulator (3) and the outer end of the insulator (3). 4. The overvoltage protector according to claim 3, characterized in that: it also includes a mounting bracket (4) fixedly connecting the insulator (3) and the lightning arrester (2), and the mounting bracket (4) includes a shape L shaped first connecting plate (41) and second connecting plate (42), the first connecting plate (41) includes a first fixed end (411) and a first connecting end (412), and the second connecting plate (42) includes a second fixed end (421) and a second connection end (422), the insulator (3) is fixed on the first fixed end (411), and the lightning arrester (2) is fixed on the second fixed end ( 421), the first connection end (412) and the second connection end (422) are detachably connected. 5. The overvoltage protector according to claim 4, characterized in that: the first connection end (412) and the length direction of the second connection end (422) are evenly provided with connection holes (43) for fixed connection, The length of the first connection end (412) is longer than the length of the second connection end (422). 6. The overvoltage protector according to claim 5, characterized in that: the number of connection holes (43) on the first connection end (412) is four, and the number of connection holes (43) on the second connection end (422) is The number of holes (43) is three. 7. The overvoltage protector according to claim 4, characterized in that: the second fixed end (421) is provided with a groove plugged into the bottom of the arrester (2) and a second portion for restricting the rotation of the arrester (2). Two bumps (423). 8. The overvoltage protector according to claim 3, characterized in that: the top of the insulator (3) is provided with a wire groove (32), and a wire crimping plate for fixing the transmission line (5) in the wire groove (32) (31).