Lightning protection system for a power line

Abstract

The utility model relates to a lightning arrester line overvoltage protection device, including lightning arrester, post insulator, wire clamp hardware, connecting plate unit and lead arc electrode. Connecting plate unit includes first connecting plate, second connecting plate and bolt assembly. Formed with a pair of insertion arms of phase-to-phase arrangement on the first connecting plate, form the strip slot on the second connecting plate and form the strip through groove on the inner bottom surface of strip slot. Two insertion arms can be inserted in the strip slot and the bolt rod in bolt assembly can pass through the gap formed between two insertion arms and strip through groove, and the first connecting plate and the second connecting plate are fixedly connected as a whole. The utility model can be applied between the post insulator and the lightning arrester of different spacing, and can ensure that the fastening components between the connecting assembly are established and form a tight fit, forming a firm and reliable connection. At the same time, the volume of the connecting assembly is reduced in space expansion, so that it is not easy to interfere with the surrounding installation environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to line overvoltage protection technical field, concretely relates to a lightning protection line overvoltage protection device. BACKGROUND

[0002] Line overvoltage protector is the equipment of protecting high altitude line. The direct lightning overvoltage or induction overvoltage caused by lightning stroke overhead line is extremely easy to cause insulator flashover or breakdown, and the power frequency continuous flow formed by the high temperature arc is fused instantaneously. In order to prevent this accident, it is necessary to install line overvoltage protector on overhead line, which functions to guide lightning current to the protector and cut off power frequency continuous flow when lightning stroke overhead line, so as to avoid insulator flashover or breakdown and protect overhead line from lightning stroke wire breaking accident. The patent document with the name of a combined lightning protection line overvoltage protector and the authorization announcement number CN204424891U discloses a lightning protection line overvoltage protector different from conventional structure. However, in the installation and use, the butt joint surface of the two L-shaped connecting plates cannot be in close contact, and there is a large gap, which is not conducive to the connection firmness and stability between the two L-shaped connecting plates. In addition, the vertical end of the L-shaped connecting plate extends downward, which is easy to interfere with the surrounding environment and may affect the safety of the device. SUMMARY

[0003] In order to overcome the above defects, the utility model provides a lightning protection line overvoltage protection device, which optimizes the structure of the connecting assembly, so that it can be applied between the insulator and the lightning arrester of different spacing, and can ensure that the connecting assembly is tightly matched between the connecting assembly and the connecting assembly. The parts are formed, and a firm and reliable connection is formed. At the same time, the volume of the connecting assembly is reduced in space expansion, so that it is not easy to interfere with the surrounding installation environment.

[0004] The utility model solves the technical scheme adopted for its technical problems: a lightning protection line overvoltage protection device, including lightning arrester, column type insulator, the wire clamp fittings arranged in the upper part of column type insulator, the connecting plate unit arranged between the lower part of lightning arrester and the lower part of column type insulator and the arc electrode fixed in the upper part of column type insulator.

[0005] The wire is fixed in the upper part of column type insulator through the wire clamp fittings, and the upper part of lightning arrester forms the first discharge gap.

[0006] The connecting plate unit includes first connecting plate, second connecting plate and bolt assembly. One end of the first connecting plate is fixed in the lower part of the lightning arrester, the other end extends to the side of the column type insulator and is fixedly connected with one end of the second connecting plate through the bolt assembly. The middle part of the second connecting plate is fixedly connected with the lower part of the column type insulator, and the other end forms an arc extinguishing electrode.

[0007] A second discharge gap is formed between the striking electrode and the arc extinguishing electrode.

[0008] A pair of insertion arms are formed on the first connecting plate and arranged alternately, a strip-shaped slot is formed on the second connecting plate, and a strip-shaped through slot is formed on the inner bottom surface of the strip-shaped slot.

[0009] The two insertion arms can be inserted into the strip-shaped slot, and the bolt rod of the bolt assembly can pass through the gap formed between the two insertion arms and the strip-shaped through slot to fixedly connect the first connecting plate and the second connecting plate into an integral whole.

[0010] The bolt assembly includes at least one bolt and a nut matched with the bolt. In actual operation, the number of bolts and nuts used generally does not exceed three.

[0011] Optionally, the strip-shaped through slot has an extension length smaller than that of the strip-shaped slot, and the two ends of the strip-shaped through slot are spaced apart from the two ends of the strip-shaped slot. The inner side edges of the insertion arms correspond to the upper surface of the inner bottom surface of the strip-shaped slot or the front and rear edges of the strip-shaped through slot.

[0012] Optionally, a fin is formed on the inner side of the insertion arm and the lower end surface, and the fin extends along the length direction of the insertion arm. The extension length of the fin is smaller than that of the insertion arm, and the two ends of the fin are spaced apart from the free end and the root of the insertion arm. Preferably, the distance between the end of the fin away from the root of the insertion arm and the free end of the insertion arm is smaller than the distance between the end of the fin close to the root of the insertion arm and the root of the insertion arm.

[0013] The thickness of the fin is not more than 3 mm, and is preferably within 1.5 mm.

[0014] Optionally, the fin extends downward by 1 mm to 5 mm relative to the lower end surface of the insertion arm in the vertical direction.

[0015] Optionally, a plurality of notches are formed on the fin and extend in the vertical direction. The plurality of notches are alternately distributed along the length extension direction of the fin, and a protruding tooth is formed between adjacent two notches.

[0016] Optionally, two strip-shaped grooves are formed on the upper end of the strip-shaped through slot and on the front and rear side walls. Two fins formed on the two insertion arms can one-to-one correspond to the two strip-shaped grooves. A resilient pad is fixedly embedded on the wall surface of the strip-shaped groove. The fin can be sunk into the resilient pad.

[0017] Optionally, a rib plate is formed on the outside of the plug-in arm and on the lower end surface, and the rib plate extends along the length direction of the plug-in arm.

[0018] Optionally, a wedge surface part is formed on the front and rear side surfaces of the second connecting plate and correspondingly at the free end. The top view contour of the two wedge surface parts is trapezoidal with the short side being the free end. A sliding sleeve is arranged on the first connecting plate, and the sliding sleeve is formed into a wedge surface type hole towards the port of the second connecting plate, and the top view contour of the wedge surface type hole is trapezoidal with the long side being the free end. The two wedge surface parts can be inserted into the wedge surface type hole, so that the sliding sleeve and the free end of the second connecting plate are connected together in interference.

[0019] The wedge surface of the wedge surface part can be designed as a serrated surface, and correspondingly, a serrated inner wall surface is arranged on the inner wall of the wedge surface type hole. When the sliding sleeve and the wedge surface part are plug-in connected, the serrated surfaces on the two are correspondingly matched, and the serrations on the two surfaces can be engaged with each other, so that the sliding sleeve can be firmly limited at the wedge surface part.

[0020] The utility model discloses the structure of connecting assembly is optimized, can be applied to between the different interval support insulator and lightning arrester, and can guarantee that the spare parts of connecting assembly establish and form the close cooperation, form firm and reliable connection, and simultaneously, the volume amount of connecting assembly in space extension is reduced, so that it is not easy to produce interference with the surrounding installation environment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the installation state structural schematic drawing of the utility model.

[0022] Figure 2 It is the structure schematic drawing of the top view of connecting assembly butt joint end.

[0023] Figure 3 It is Figure 2 It is the partial enlarged structure schematic drawing of A in the middle.

[0024] Figure 4 It is the structure schematic drawing of the front view of connecting assembly butt joint end.

[0025] Figure 5 It is Figure 4 It is the partial enlarged structure schematic drawing of B in the middle.

[0026] In the figure: 10 arrester; 20 post insulator; 30 wire; 40 wire clamp fitting; 50 connecting plate unit, 51 first connecting plate, 511 insertion arm, 512 fin, 5121 notch, 513 rib plate, 52 second connecting plate, 521 arc extinguishing electrode, 522 strip-shaped groove, 523 strip-shaped through groove, 524 strip-shaped sink groove, 5241 elastic pad, 525 channel, 526 wedge surface part, 53 bolt assembly, 531 bolt, 532 nut, 54 sliding sleeve; 60 arc striking electrode; 1 first discharge gap, 2 second discharge gap. DETAILED DESCRIPTION

[0027] The structures, proportions, sizes, etc. shown in the drawings of the specification are merely used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the utility model, so they do not have substantial technical significance. Any modification of structure, change of proportional relationship or adjustment of size, without affecting the functions and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "front", "rear", "middle" and the like used in the specification are merely for the convenience of clear description, and are not used to limit the scope of implementation of the utility model. The change or adjustment of the relative relationship, without substantial change of technical content, is also considered as the implementation scope of the utility model.

[0028] As shown in Figures 1 to 5 An arrester line overvoltage protection device, comprising an arrester 10, a post insulator 20, a wire clamp fitting 40 arranged on the upper part of the post insulator 20, a connecting plate unit 50 arranged between the lower part of the arrester 10 and the lower part of the post insulator 20, and an arc striking electrode 60 fixed on the upper part of the post insulator 20. The wire 30 is fixed on the upper part of the post insulator 20 through the wire clamp fitting 40, and forms a first discharge gap 1 with the upper part of the arrester 10.

[0029] The connecting plate unit 50 comprises a first connecting plate 51, a second connecting plate 52 and a bolt assembly 53.

[0030] One end of the first connecting plate 51 is fixed on the lower part of the arrester 10, the other end extends towards one side of the post insulator 20 and is fixedly connected with one end of the second connecting plate 52 through the bolt assembly 53. The middle part of the second connecting plate 52 is fixedly connected with the lower part of the post insulator 20, and the other end forms an arc extinguishing electrode 521. A second discharge gap 2 is formed between the arc striking electrode 60 and the arc extinguishing electrode 521.

[0031] The first connecting plate 51 is in the shape of a straight strip, the body of the second connecting plate 52 is in the shape of a straight strip, and one end of the body is connected to the arc extinguishing electrode 521, and the second connecting plate 52 is in the shape of an L in the front view, but the inner folding angle is obtuse.

[0032] A pair of plug-in arms 511 are arranged on the first connecting plate 51, a strip-shaped slot 522 is formed on the second connecting plate 52, and a strip-shaped through slot 523 is formed on the inner bottom surface of the strip-shaped slot 522.

[0033] The two plug-in arms 511 can be inserted into the strip-shaped slot 522, and the bolt rod of the bolt assembly 53 can pass through the gap formed between the two plug-in arms 511 and the strip-shaped through slot 523, so as to fixedly connect the first connecting plate 51 and the second connecting plate 52 as a whole. The distribution width of the two plug-in arms 511 in the front-rear direction is not greater than the width (size in the front-rear direction) of the strip-shaped slot 522, and preferably the relative surfaces between the plug-in arms 511 and the strip-shaped slot 522 can be kept in contact.

[0034] After the two plug-in arms 511 are inserted into the strip-shaped slot 522, the front-rear gap interval formed between the two plug-in arms 511 can correspond to the upper part of the strip-shaped slot 522. The bolt 531 of the bolt assembly 53 can pass through the gap between the two plug-in arms 511 and the strip-shaped through slot 523 from top to bottom, and match the upper nut 532 on the bolt rod extending to the lower part of the strip-shaped through slot 523, so as to fixedly connect the plug-in part between the first connecting plate 51 and the second connecting plate 52 as a whole.

[0035] The bolt assembly 53 at least includes one bolt 531 and a nut 532 matched therewith. In actual operation, the bolt assembly 53 generally does not exceed three bolts 531 and nuts 532 matched with each bolt 531.

[0036] In the above embodiment, the first connecting plate 51 and the second connecting plate 52 are connected by the plug-in structure, so that the butt joint part between the two plates can have an interval in the left-right direction, and can be applied between the lightning arrester 10 and the column insulator 20 with a fixed position interval value in a certain interval, so as to ensure that the two connecting plates can be fixedly connected without gap and filler, and improve the stability. At the same time, the butt joint end between the two connecting plates does not significantly extend to other directions in space, significantly reduces the extension range of the butt joint end in space, and can better maintain a safe distance from the periphery of the installation environment to avoid interference.

[0037] The extension length of the strip-shaped through slot 523 is shorter than that of the strip-shaped slot 522, and the two ends of the strip-shaped through slot 523 are spaced apart from the two ends of the strip-shaped slot 522. The inner side edge of the insertion arm 511 corresponds to above the inner bottom surface of the strip-shaped slot 522, or corresponds to near the front and rear edges of the strip-shaped through slot 523 (at the strip-shaped through slot 524 as provided, which will be mentioned below).

[0038] A fin 512 is formed on the inner side of the insertion arm 511 and on the lower end surface, and extends along the length direction of the insertion arm 511. The extension length of the fin 512 is shorter than that of the insertion arm 511, and the two ends of the fin 512 are spaced apart from the free end and the root of the insertion arm 511.

[0039] As shown in Figure 2 The spacing between the one end of the fin 512 away from the root of the insertion arm 511 and the free end of the insertion arm 511 is smaller than the spacing between the one end of the fin 512 close to the root of the insertion arm 511 and the root of the insertion arm 511, so that the fin 512 can correspond to the strip-shaped slot 522 after the insertion connection relationship between the first connecting plate 51 and the second connecting plate 52 is established.

[0040] The thickness of the fin 512 is not more than 3 mm, and is preferably within 1.5 mm. Meanwhile, in the vertical direction, the fin 512 extends downward by 1 mm to 5 mm relative to the lower end surface of the insertion arm 511.

[0041] When the inner side edge of the insertion arm 511 corresponds to above the inner bottom surface of the strip-shaped slot 522, the fin 512 can correspond to the inner bottom surface of the strip-shaped slot 522, and when the two connecting plates are fixed together by the bolt assembly 53, the position of the fin 512 corresponding to the bolt assembly 53 can be crushed, so as to increase the static frictional resistance formed between the contact surfaces between the two connecting plates, and improve the firmness of the connection part.

[0042] A plurality of notches 5121 are distributed on the fin 512 and extend in the vertical direction. The plurality of notches 5121 are distributed alternately along the length extension direction of the fin 512, and a protruding tooth is formed between two adjacent notches 5121. Such design can make the crushing of the fin 512 more sufficient, and be more helpful to improve the gripping force between the contact surfaces and increase the frictional resistance.

[0043] To further improve the stability, reliability and firmness of the connection between the two connecting plates, two strip-shaped recesses 524 are formed at the upper end of the strip-shaped through slot 523 and on the front and rear side walls. The two fin strips 512 formed on the plug-in arms 511 can correspondingly match the two strip-shaped recesses 524. An elastic pad 5241 is fixedly embedded on the wall surface of the strip-shaped recess 524. The fin strip 512 can be sunk in the elastic pad 5241, and the protrusions on the fin strip 512 can be bitten into the elastic pad 5241, thereby increasing the firmness and stability of the connection structure.

[0044] To ensure that the first connecting plate 51 has good rigidity and strength, a rib plate 513 is formed on the outside of the plug-in arm 511 and at the lower end surface, and the rib plate 513 extends along the length direction of the plug-in arm 511. Correspondingly, a groove 525 is formed on the inner bottom surface of the strip-shaped slot 522 and at the root of the front and rear sides. The free end of the groove 525 is an open end. After the plug-in arm 511 matches the strip-shaped slot 522, the rib plate 513 can be inserted into the groove 525. Generally, the thickness (dimension in the front-rear direction shown in the figure) of the rib plate 513 is consistent with the width (dimension in the front-rear direction shown in the figure) of the groove 525.

[0045] The front and rear sides of the second connecting plate 52 and the free ends thereof are formed as wedge surfaces 526. The top view profile of the two wedge surfaces 526 is trapezoidal with the short side being the free end, as shown in Figure 2 .

[0046] A sliding sleeve 54 is provided on the first connecting plate 51, and the sliding sleeve 54 is formed as a wedge-shaped hole (not shown in the figure) towards the port of the second connecting plate 52. The top view profile of the wedge-shaped hole is trapezoidal with the long side being the free end.

[0047] The two wedge surfaces 526 can be inserted into the wedge-shaped hole, so that the sliding sleeve 54 and the free end of the second connecting plate 52 are connected together with interference. The wedge surface of the wedge surface 526 can be designed as a thin tooth surface, and correspondingly, a thin tooth inner wall surface is provided on the inner wall of the wedge-shaped hole. When the sliding sleeve 54 and the wedge surface 526 are connected by plug-in, the thin tooth surfaces on the two surfaces correspondingly match, and the thin teeth on the two surfaces can be bitten into each other, so that the sliding sleeve 54 can be firmly limited at the wedge surface 526, and the end of the second connecting plate 52 can be clamped at the middle or inner side of the plug-in arm 511, which helps to improve the rigidity of the connection structure established between the two connecting plates in the front-rear direction.

[0048] The above-mentioned embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. The present application can be improved in many aspects without departing from the general idea, and the above-mentioned embodiments can be modified or changed by those skilled in the art without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. A lightning protection device for line overvoltage, comprising a lightning arrester, a post insulator, a wire clamp configured on the upper part of the post insulator, a connecting plate unit configured between the lower part of the lightning arrester and the lower part of the post insulator, and an arc striking electrode fixed on the upper part of the post insulator; a wire is fixed on the upper part of the post insulator through the wire clamp and forms a first discharge gap with the upper part of the lightning arrester; the connecting plate unit comprises a first connecting plate, a second connecting plate and a bolt assembly; one end of the first connecting plate is fixed on the lower part of the lightning arrester, the other end extends towards the side of the post insulator and can be fixedly connected with one end of the second connecting plate through the bolt assembly; the middle part of the second connecting plate is fixedly connected with the lower part of the post insulator, and the other end forms an arc extinguishing electrode; a second discharge gap is formed between the arc striking electrode and the arc extinguishing electrode; characterized in that: A pair of plug-in arms are arranged on the first connecting plate, a strip-shaped slot is formed on the second connecting plate, and a strip-shaped through slot is formed on the inner bottom surface of the strip-shaped slot; the two plug-in arms can be inserted into the strip-shaped slot, and the bolt rod of the bolt assembly can pass through the gap between the two plug-in arms and the strip-shaped through slot to fixedly connect the first connecting plate and the second connecting plate as a whole.

2. The lightning line overvoltage protection device of claim 1, wherein: The extension length of the strip-shaped through slot is less than the extension length of the strip-shaped slot, and the two ends of the strip-shaped through slot are spaced apart from the two ends of the strip-shaped slot; the inner side edges of the plug-in arms correspond to the upper side of the inner bottom surface of the strip-shaped slot or the front and rear edges of the strip-shaped through slot.

3. The lightning line overvoltage protection device of claim 1, wherein: A fin is formed on the inner side of the plug-in arm and extends along the length direction of the plug-in arm; the extension length of the fin is less than the extension length of the plug-in arm, and the two ends of the fin are spaced apart from the free end and the root of the plug-in arm, respectively.

4. The lightning line overvoltage protection device of claim 3, wherein: The spacing between the end of the fin away from the root of the plug-in arm and the free end of the plug-in arm is less than the spacing between the end of the fin close to the root of the plug-in arm and the root of the plug-in arm.

5. The lightning line overvoltage protection device of claim 3, wherein: The thickness of the fin is not greater than 3 mm.

6. The lightning line overvoltage protection device of claim 3, wherein: In the vertical direction, the fin extends downward by 1 mm to 5 mm relative to the lower end surface of the plug-in arm.

7. The lightning line overvoltage protection device according to any one of claims 3 to 6, characterized in that: A plurality of notches are formed on the fin and extend in the vertical direction; the plurality of notches are arranged alternately along the length extension direction of the fin, and a protruding tooth is formed between any two adjacent notches.

8. The lightning line overvoltage protection device of claim 7, wherein: Two strip-shaped recesses are formed on the upper end of the strip-shaped through slot and on the front and rear side walls; the fins on the two plug-in arms can be matched with the two strip-shaped recesses one by one; a resilient pad is fixedly embedded on the wall surface of the strip-shaped recess; the fin can be sunk into the resilient pad.

9. The lightning line overvoltage protection device of claim 1, wherein: A rib plate is formed on the outer side of the plug-in arm and extends along the length direction of the plug-in arm; correspondingly, a groove is formed on the inner bottom surface of the strip-shaped slot and at the two root portions; the free end of the groove is an open end; after the plug-in arm is matched with the strip-shaped slot, the rib plate can be inserted into the groove.

10. The lightning line overvoltage protection device of claim 9, wherein: The front and rear side surfaces of the second connecting plate correspond to the free end and are formed as wedge surfaces; the top view of the two wedge surfaces is formed as a trapezoid with the short side being the free end side; a sliding sleeve is arranged on the first connecting plate and is formed as a wedge-shaped hole towards the end of the second connecting plate; the top view of the wedge-shaped hole is formed as a trapezoid with the long side being the free end; the two wedge surfaces can be inserted into the wedge-shaped hole to make the sliding sleeve and the free end of the second connecting plate be connected together with interference.

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