CN210692242U

CN210692242U - Lightning arrester

Info

Publication number: CN210692242U
Application number: CN201921667301.4U
Authority: CN
Inventors: 王学东; 艾建红
Original assignee: Anhui Itatom Power Equipment Co ltd
Current assignee: Anhui Hedian Ruiheng Electric Power Technology Co.,Ltd.
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-06-05
Anticipated expiration: 2029-09-30

Abstract

The utility model relates to the field of high-voltage equipment, in particular to a lightning arrester, which comprises a valve block component and an insulating core body, wherein the insulating core body is wrapped outside the valve block component; the valve plate assembly comprises a first valve plate group, a second valve plate group and an elastic assembly arranged between the first valve plate group and the second valve plate group; a voltage-sharing capacitor C1 is arranged in the insulating core body corresponding to the elastic component and the second valve plate group, the voltage-sharing capacitor C1 is composed of a plurality of capacitor screens alternately arranged with the insulating layer, and the innermost first screen in the voltage-sharing capacitor C1 is electrically connected with the second valve plate group; the utility model discloses arrester, its manufacturing cost is lower, and the volume is littleer, insulating nature is better.

Description

Lightning arrester

Technical Field

The utility model relates to a high-voltage equipment field, concretely relates to arrester.

Background

The existing arrester is characterized in that a valve block assembly of the existing arrester is formed by continuously stacking a plurality of valve blocks, in order to guarantee the insulativity of the arrester, an insulating core body with a voltage-sharing capacitor is required to be integrally sleeved outside the whole valve block assembly, the number of capacitor screens of the voltage-sharing capacitor is large, the production cost is high, and the arrester is huge in volume.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a lightning arrester, its manufacturing cost is lower, the volume is littleer, insulating nature is better.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a lightning arrester comprises a valve plate assembly 1 and an insulating core body 3, wherein the insulating core body 3 is wrapped outside the valve plate assembly 1;

the valve plate assembly 1 comprises a first valve plate group 1a, a second valve plate group 1b and an elastic assembly 1c arranged between the first valve plate group 1a and the second valve plate group 1 b;

the positions, corresponding to the elastic component 1C and the second valve plate group 1b, in the insulating core body 3 are provided with a voltage-sharing capacitor C1, the voltage-sharing capacitor C1 is composed of a plurality of capacitor screens alternately arranged with the insulating layer, and the innermost first screen in the voltage-sharing capacitor C1 is electrically connected with the second valve plate group 1 b.

Preferably, one end of the elastic component 1C, which is matched with the first valve plate group 1a, is a first pressing end, and the voltage-sharing capacitor C1 sequentially deviates and sequentially overlaps from the first pressing end to the end screen of the second valve plate group 1b, which is far away from the elastic component 1C, along the axial direction of the valve plate group 1 from the first pressing end to the end screen of the second valve plate group 1 b.

Preferably, a voltage dividing capacitor C2 is further disposed in the insulating core 3, the voltage dividing capacitor C2 is composed of a plurality of capacitor screens alternately disposed with the insulating layer, and the voltage dividing capacitor C2 is connected in parallel with the voltage equalizing capacitor C1.

Preferably, the valve plate assembly further comprises a first flange 5, the first flange 5 is sleeved in the middle of the insulating core 3 and fixedly connected with the insulating core 3, a head screen at the innermost side of the voltage-dividing capacitor C2 is fixedly connected with a tail screen at the outermost side of the insulating core, and the first flange deviates from the first pressing end to one end, far away from the elastic assembly 1C, of the first flange 5 along the axial direction of the valve plate assembly 1 and is sequentially overlapped with the first flange 5.

Preferably, the first screen of the voltage dividing capacitor C2 is shared with the first screen of the voltage equalizing capacitor C1, and at least one end capacitive screen of the voltage dividing capacitor C2 is shared with at least one end capacitive screen of the voltage equalizing capacitor C1.

Preferably, the valve further comprises a first terminal 2a and a first flange 5, the first terminal 2a is arranged at the end of the insulating core body where the first valve piece group 1a is arranged, and the first flange 5 is sleeved on the middle part of the insulating core body 3 and fixedly connected with the insulating core body.

Preferably, still including the female head 7 of insulating that the components of a whole that can function independently set up, insulating female head 7 is used for with high-voltage equipment fixed connection, the arrester is connected with insulating female head 7 plug.

Preferably, the insulating female head 7 includes a female cylinder 70, and a contact assembly 72 and a second flange 71 respectively disposed at two ends of the female cylinder 70, the contact assembly 72 seals one end of the female cylinder 70, the insulating female head 7 is sleeved outside one end of the insulating core 3, the contact assembly 72 is engaged with the first terminal 2a, and the second flange 71 is engaged with the first flange 5.

Preferably, a silicone rubber sheath 6 is further included, the silicone rubber sheath 6 being disposed outside one end of the insulating core 3 between the first terminal 2a and the first flange 5.

Preferably, the contact assembly 72 includes a contact block 720 connected to one end of the female cylinder 70 and a contact 721 disposed in the middle of the contact block 720, a contact slot 7210 is disposed in the middle of the contact 721, and the first terminal 2a is inserted into the contact slot 7210 and electrically connected thereto.

Preferably, the lightning arrester further comprises a second terminal 2b, wherein the second terminal 2b is arranged at the end part of the end, provided with the second valve plate group 1b, of the insulating core body and is used for being connected with a counter for counting the number of lightning strokes.

Preferably, the first valve plate group 1a is composed of a plurality of valve plates sequentially stacked between the first terminal 2a and the elastic member 1c, and the second valve plate group 1b is composed of a plurality of valve plates sequentially stacked between the second terminal 2b and the elastic member 1 c.

Preferably, the elastic assembly 1c includes a pressing spring 11c and a voltage equalizing terminal 10c, and both ends of the pressing spring 11c are connected to one voltage equalizing terminal 10 c.

The utility model discloses an arrester, it includes valve block subassembly 1, and valve block subassembly 1 is including setting up first valve block group 1a and second valve block group 1b in elastic component 1c both sides respectively, enables the voltage that loads on the arrester and divides into on first valve block group 1a and second valve block group 1b to make the voltage that second valve block group 1b bore far less than the voltage that the arrester wholly bore; the utility model discloses when the arrester uses with the cooperation of GIS (high-voltage distribution device), its one end that is equipped with first valve disk group 1a inserts inside the GIS, realize its insulation by GIS, the one end that is equipped with second valve disk group 1b of arrester is located the outside of GIS, realize its insulation by voltage-sharing electric capacity C1, because the voltage that second valve disk group 1b bore is showing to be reduced, therefore the required electric capacity screen quantity of voltage-sharing electric capacity C1 is showing to be reduced, thereby be favorable to reducing the volume of arrester and reduce manufacturing cost; further, because the voltage that second valve block group 1b bore is littleer, also be favorable to improving the utility model discloses the insulating nature of arrester.

In addition, when the lightning arrester of the utility model is matched with a GIS, the insulating female head 7 can be pre-installed in the GIS and fixedly connected with the shell of the GIS through the second flange 71, and then the upper end of the insulating core body 3 is inserted into the female head cylinder body 70, so that the first flange 5 is fixedly connected with the second flange 71; when needs overhaul, maintain or change the utility model discloses during the arrester, only need with insulating core 3 from insulating female 7 in unload can, can not lead to the inside gaseous leakage of GIS, avoid filling the dress gas to GIS repeatedly because of the dismantlement of arrester, once be favorable to practicing thrift the cost, two have improved operating efficiency, realized the utility model discloses arrester and GIS's plug cooperation.

Drawings

Fig. 1 is a schematic structural view of the lightning arrester of the present invention;

fig. 2 is a schematic structural view of the lightning arrester of the present invention with the insulating female terminal and the elastic member removed;

fig. 3 is an enlarged schematic view of a portion a of fig. 2 according to the present invention;

fig. 4 is an enlarged schematic view of a portion B of fig. 2 according to the present invention;

fig. 5 is a schematic structural view of the elastic component of the present invention;

fig. 6 is a schematic structural view of the female insulation head of the present invention.

Detailed Description

The following describes the specific implementation of the intelligent lightning arrester of the present invention with reference to the embodiments shown in fig. 1 to 6. The utility model discloses an intelligent arrester is not limited to the description of following embodiment.

The utility model discloses a lightning arrester, it includes valve block assembly 1 and insulating core 3, insulating core 3 wraps up in the outside of valve block assembly 1; the valve plate assembly 1 comprises a first valve plate group 1a, a second valve plate group 1b and an elastic assembly 1c arranged between the first valve plate group 1a and the second valve plate group 1 b; the positions, corresponding to the elastic component 1C and the second valve plate group 1b, in the insulating core body 3 are provided with a voltage-sharing capacitor C1, the voltage-sharing capacitor C1 is composed of a plurality of capacitor screens alternately arranged with insulating layers, the first screen at the innermost side in the voltage-sharing capacitor C1 is electrically connected with the second valve plate group 1b, and the last screen at the outermost side is grounded.

As shown in fig. 1-2, it is an embodiment of the lightning arrester of the present invention.

The lightning arrester comprises a first terminal 2a, a second terminal 2b, a valve block assembly 1 and an insulating core body 3, wherein the first terminal 2a and the second terminal 2b are respectively arranged at two ends of the valve block assembly 1, and the insulating core body 3 is wrapped outside the valve block assembly 1; the valve plate assembly 1 comprises a first valve plate group 1a, a second valve plate group 1b and an elastic assembly 1c arranged between the first valve plate group 1a and the second valve plate group 1b, a first terminal 2a is arranged at the end part of one end of the insulating core body, which is provided with the first valve plate group 1a, a second terminal 2b is arranged at the end part of one end of the insulating core body, which is provided with the second valve plate group 1b, and the elastic assembly 1c is respectively matched with the first terminal 2a and the second terminal 2b to respectively press the first valve plate group 1a and the second valve plate group 1 b; one end of the elastic component 1c matched with the first valve plate group 1a is a first pressing end; the insulating core body 3 comprises a voltage-sharing capacitor C1 wrapped outside the elastic component 1C and the second valve plate group 1b, one end of the elastic component 1C matched with the first valve plate group 1a is a first pressing end, the voltage-sharing capacitor C1 is sequentially deviated and sequentially overlapped from the first pressing end to the end, far away from the elastic component 1C, of the second valve plate group 1b along the axial direction of the valve plate group 1 from the first pressing end to the end, far away from the elastic component 1C, of the first valve plate group 1 a.

Specifically, as shown in fig. 1 and 2, the first terminal 2a and the second terminal 2b are respectively disposed at the upper end and the lower end of the valve assembly 1, the first valve assembly 1a and the second valve assembly 1b are respectively located at the upper portion and the lower portion of the valve assembly 1, the elastic assembly 1c is located between the first valve assembly 1a and the second valve assembly 1b, the upper end of the elastic assembly 1c is a first pressing end, and is matched with the first terminal 2a to press the first valve assembly 1a, the lower end of the elastic assembly 1c is matched with the second terminal 2b to press the second valve assembly 1b, and the upper end and the lower end of the elastic assembly 1c are respectively electrically connected with the first valve assembly 1a and the second valve assembly 1 b; the first screen to the last screen of the voltage-sharing capacitor C1 sequentially and downwardly shift and sequentially overlap each other along the axial direction of the valve plate assembly 1 from the upper end of the elastic assembly 1C to the lower end of the second valve plate assembly 1b (namely, in two adjacent capacitive screens, the capacitive screen positioned on the outer side is downwardly shifted by a certain distance compared with the capacitive screen positioned on the inner side, then the upper end of the capacitive screen positioned on the outer side is overlapped with the lower end of the capacitive screen positioned on the inner side, and an insulating layer is arranged between the two adjacent capacitive screens); the diameter of the capacitor screen from inside to outside gradually increases from the first screen to the last screen of the voltage-sharing capacitor C1 along the radial direction of the valve plate assembly 1, the first screen at the innermost side of the voltage-sharing capacitor C1 is electrically connected with the upper end and the lower end of the elastic assembly 1C, the electric potential is consistent, and the first screen is electrically connected with the second valve plate assembly 1 b. In a preferred embodiment, the insulating core is formed by winding an epoxy-impregnated glass filament as an insulating layer, a semi-conductive tape or metal tape as a capacitive screen, and the insulating layer and the capacitive screen alternately. The insulating core body can also be formed by sequentially overlapping and pouring a group of cylindrical capacitive screens.

Preferably, as shown in fig. 5, the elastic member 1c includes a pressing spring 11c and a voltage equalizing terminal 10c, and both ends of the pressing spring 11c are connected to one voltage equalizing terminal 10 c. Further, as shown in fig. 5, an axial interface of the voltage-sharing terminal 10c is a T-shaped structure, the voltage-sharing terminal 10c includes a connecting table and a pressing table, a diameter of the pressing table is larger than a diameter of the connecting table, the connecting table and the pressing table are coaxial, the connecting table is inserted into a middle portion of the pressing spring 11c, and the pressing table is matched with the first valve plate group 1a and the second valve plate group 1 b. Further, the pressing spring 11c is made of metal, and the voltage-equalizing terminal 10c is made of metal or made of zinc oxide.

Preferably, as shown in fig. 1 and 2, the first vane group 1a is composed of a plurality of vanes sequentially stacked between the first terminal 2a and the elastic member 1c, and the second vane group 1b is composed of a plurality of vanes sequentially stacked between the second terminal 2b and the spring member 1 c. Further, the valve plate is a zinc oxide valve plate. The utility model discloses an arrester is through the valve block quantity of adjustment constitution first valve block group 1a, the valve block quantity of constitution second valve block group 1b, can realize the adjustment to first valve block group 1a and second valve block group 1b partial pressure ratio, thereby make the utility model discloses an arrester can be applied to under more application condition or scenes, great improvement the utility model discloses an arrester's commonality.

Preferably, as shown in fig. 1 and 2, the utility model discloses an arrester further includes first flange 5, and first flange 5 cover is established at the middle part of insulating core 3 and is rather than fixed continuous, and is preferred, and first flange 5 sets up the position that corresponds elastic component 1 c. The utility model discloses a when the arrester was used with the GIS cooperation, the first flange of accessible 5 was fixed continuous with GIS's casing to assembly efficiency has been improved.

It should be pointed out that the lightning arrester of the utility model can also be manufactured in a mode of multi-group electric parallel voltage division.

Preferably, as shown in fig. 1 and 2, a voltage dividing capacitor C2 is further disposed in the insulating core 3, the voltage dividing capacitor C2 is composed of a plurality of capacitor screens alternately disposed with the insulating layer, the voltage dividing capacitor C2 is connected in parallel with the voltage equalizing capacitor C1, a first screen at the innermost side of the voltage dividing capacitor C2 is electrically connected to the upper end of the elastic component 1C, and a last screen at the outermost side is grounded. Of course, the arrester can also be made by using a mode of parallel voltage division of a plurality of groups of capacitive screens.

Preferably, partial pressure electric capacity C2 sets up in the position that corresponds elastic component 1C and first flange 5, partial pressure electric capacity C2's first screen to last screen (first screen is located the innermost, and the end screen is located the outside), along valve block assembly 1's axial from first compress tightly the end to the one end of keeping away from elastic component 1C of first flange 5, to the skew of first flange 5 place side in proper order and overlap in proper order, can effectively solve insulating problem between inside high pressure and the outside first flange. Preferably, the voltage-dividing capacitor C2 is formed by winding a glass filament soaked in epoxy resin as an insulating layer and a semi-conductive belt or metal belt as a capacitor screen while manufacturing the voltage-equalizing capacitor C1.

Further, the first screen of the voltage dividing capacitor C2 is shared with the first screen of the voltage equalizing capacitor C1, and at least one end capacitive screen of the voltage dividing capacitor C2 is shared with at least one end capacitive screen of the voltage equalizing capacitor C1, which may be grounded, respectively. Further, as shown in fig. 3, the first screen of the voltage dividing capacitor C2 is shared with the first screen of the voltage equalizing capacitor C1, and as shown in fig. 4, the two end capacitive screens of the voltage dividing capacitor C2 are shared with the two end capacitive screens of the voltage equalizing capacitor C1.

Specifically, as shown in fig. 1 and 2, the first panel to the last panel of the voltage-dividing capacitor C2 are sequentially sleeved downward and sequentially in the axial direction of the valve plate assembly 1 from the upper end of the elastic assembly 1C to the lower end of the first flange 5 (that is, in two adjacent capacitive panels, the capacitive panel located on the outer side is shifted downward by a certain distance compared with the capacitive panel located on the inner side, then the upper end of the capacitive panel located on the outer side is sleeved with the lower end of the capacitive panel located on the inner side, and an insulating layer is arranged between the two adjacent capacitive panels), and since the two end capacitive panels are shared by the voltage-sharing capacitor C1, the last two capacitive panels of the voltage-dividing capacitor C2 in the figure are shifted to the lower end of the second valve plate assembly 1 b; the diameter of the capacitance screen from inside to outside is gradually increased from the first screen to the last screen of the voltage-dividing capacitor C2 along the radial direction of the valve plate assembly 1. Preferably, the utility model discloses an arrester still includes signal output terminal, and the penultimate screen in voltage-sharing electric capacity C1 or partial pressure electric capacity C2's the outside links to each other with signal output terminal, and voltage-sharing electric capacity C1 or partial pressure electric capacity C2's voltage is taken a percentage promptly for output detected signal. The output signal of signal output terminal can be used in the utility model discloses the measurement of the insulating parameter of arrester. In addition, a capacitor connected in series can be independently wound outside the voltage-sharing capacitor C1 or the voltage-dividing capacitor C2 through a capacitive screen to output a detection signal.

Preferably, said second terminal 2b is connected to a counter for counting the number of lightning strokes.

Preferably, the valve plate assembly 1, the end screen of the voltage-sharing capacitor C1 and the end screen of the voltage-dividing capacitor C2 are all grounded through the second terminal 2 b.

Preferably, the insulating layer is glass fiber cloth soaked with epoxy resin liquid.

Fig. 1 shows another embodiment of the lightning arrester according to the present invention.

This embodiment differs from the above embodiment in that: the utility model discloses an arrester is still including the insulating female 7 that the components of a whole that can function independently set up, insulating female 7 be used for with high-tension apparatus fixed connection, the arrester is connected with insulating female 7 plugs.

The insulating female head 7 comprises a female head cylinder 70, and a contact assembly 72 and a second flange 71 which are respectively arranged at two ends of the female head cylinder 70, wherein one end of the female head cylinder 70 is sealed by the contact assembly 72, the insulating female head 7 is sleeved outside one end of the insulating core body 3, the contact assembly 72 is matched with the first terminal 2a, and the second flange 71 is matched with the first flange 5.

Specifically, as shown in fig. 1, the insulating female head 7 is sleeved on the upper end of the insulating core body 3, so that the first valve plate group 1a is located in the female head cylinder 70. Further, the upper portion of the resilient member 1c is also located within the female cylinder 70, as oriented in FIG. 1. Further, as shown in fig. 1, the upper portion of the voltage dividing capacitor C1 is also located in the female cylinder 70.

When the lightning arrester of the utility model is matched with a GIS, the insulating female head 7 can be pre-installed in the GIS and fixedly connected with a shell of the GIS through the second flange 71, and then the upper end of the insulating core body 3 is inserted into the female head cylinder body 70, so that the first flange 5 is fixedly connected with the second flange 71; when needs overhaul, maintain or change the utility model discloses during the arrester, only need with insulating core 3 from insulating female 7 in unload can, can not lead to the inside gaseous leakage of GIS, avoid filling the dress gas to GIS repeatedly because of the dismantlement of arrester, once be favorable to practicing thrift the cost, two have improved operating efficiency, realized the utility model discloses arrester and GIS's plug cooperation. Further, the voltage dividing capacitor C2 ensures insulation between the high voltage inside the lightning arrester and the external flange.

Preferably, as shown in fig. 6, the contact assembly 72 includes a contact block 720 connected to one end of the female cylinder 70 and a contact 721 disposed in the middle of the contact block 720, wherein a contact slot 7210 is disposed in the middle of the contact 721, and the first terminal 2a is inserted into the contact slot 7210 and electrically connected thereto.

Preferably, as shown in fig. 1, the lightning arrester of the present invention further includes a silicon rubber sheath 6, the silicon rubber sheath 6 is disposed outside one end of the insulating core 3, and is located between the first terminal 2a and the first flange 5, and is located at a position where the insulating core 3 corresponds to the female cylinder 70. The silicone rubber sheath 6 is advantageous for improving the insulation on the first valve group 1a side. Further, as shown in fig. 1, the side wall of the silicone rubber sheath 6 has a trapezoidal axial cross section, and the thickness of the end connected to the first terminal 2a is smaller than the thickness of the end connected to the first flange 5.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A lightning arrester comprises a valve plate assembly (1) and an insulating core body (3), wherein the insulating core body (3) wraps the outside of the valve plate assembly (1); the method is characterized in that:

the valve plate assembly (1) comprises a first valve plate group (1a), a second valve plate group (1b) and an elastic assembly (1c) arranged between the first valve plate group (1a) and the second valve plate group (1 b);

and voltage-sharing capacitors C1 are arranged in the insulating core body (3) at positions corresponding to the elastic component (1C) and the second valve plate group (1b), each voltage-sharing capacitor C1 is composed of a plurality of capacitor screens alternately arranged with the insulating layers, and the innermost first screen in the voltage-sharing capacitors C1 is electrically connected with the second valve plate group (1 b).

2. A surge arrester according to claim 1, characterized in that: the end, matched with the first valve plate group (1a), of the elastic component (1C) is a first pressing end, and the end, away from the elastic component (1C), of the second valve plate group (1b) is sequentially deviated and sequentially overlapped from the first pressing end to the end screen at the most inner side in the voltage-sharing capacitor C1 along the axial direction of the valve plate component (1).

3. A surge arrester according to claim 1, characterized in that: the insulating core body (3) is also internally provided with a voltage division capacitor C2, the voltage division capacitor C2 is composed of a plurality of capacitor screens alternately arranged with the insulating layer, and the voltage division capacitor C2 is connected with the voltage-sharing capacitor C1 in parallel.

4. A surge arrester as claimed in claim 3, wherein: still include first flange (5), first flange (5) cover is established and is linked to each other with insulating core (3) are fixed at the middle part of insulating core (3), the end screen of the most inboard head screen to the outside of partial pressure electric capacity C2, along the axial of valve block subassembly (1) from first compress tightly end to the one end of keeping away from elastic component (1C) of first flange (5), in proper order to the skew of first flange (5) place side and overlap in proper order.

5. A surge arrester as claimed in claim 3, wherein: the first screen of the voltage dividing capacitor C2 is shared with the first screen of the voltage equalizing capacitor C1, and at least one tail end capacitive screen of the voltage dividing capacitor C2 is shared with at least one tail end capacitive screen of the voltage equalizing capacitor C1.

6. A surge arrester according to claim 1, characterized in that: the valve core further comprises a first terminal (2a) and a first flange (5), the first terminal (2a) is arranged at the end of one end, provided with the first valve piece group (1a), of the insulating core body, and the first flange (5) is sleeved in the middle of the insulating core body (3) and fixedly connected with the insulating core body.

7. The surge arrester of claim 6, wherein: still including insulating female head (7) that the components of a whole that can function independently set up, insulating female head (7) are used for with high-tension apparatus fixed connection, the arrester is connected with insulating female head (7) plug.

8. A surge arrester according to claim 7, characterized in that: the insulating female head (7) comprises a female head cylinder (70), and a contact assembly (72) and a second flange (71) which are respectively arranged at two ends of the female head cylinder (70), wherein the contact assembly (72) seals one end of the female head cylinder (70), the insulating female head (7) is sleeved outside one end of the insulating core body (3), the contact assembly (72) is matched with the first terminal (2a), and the second flange (71) is matched with the first flange (5).

9. The surge arrester of claim 6, wherein: the insulating core is characterized by further comprising a silicon rubber sheath (6), wherein the silicon rubber sheath (6) is arranged outside one end of the insulating core (3) and is positioned between the first terminal (2a) and the first flange (5).

10. A surge arrester according to claim 8, characterized in that: the contact assembly (72) comprises a contact seat (720) connected with one end of the female cylinder body (70) and a contact (721) arranged in the middle of the contact seat (720), a contact slot (7210) is arranged in the middle of the contact (721), and the first terminal (2a) is inserted in the contact slot (7210) and electrically connected with the contact slot.

11. The surge arrester of claim 6, wherein: the lightning protection device also comprises a second terminal (2b), wherein the second terminal (2b) is arranged at the end part of the end, provided with the second valve plate group (1b), of the insulation core body and is used for being connected with a counter for counting the number of lightning strokes.

12. A surge arrester according to claim 1, characterized in that: the first valve plate group (1a) is composed of a plurality of valve plates which are sequentially stacked between the first terminal (2a) and the elastic component (1c), and the second valve plate group (1b) is composed of a plurality of valve plates which are sequentially stacked between the second terminal (2b) and the elastic component (1 c).

13. A surge arrester according to claim 1, characterized in that: the elastic assembly (1c) comprises a pressing spring (11c) and a voltage-sharing terminal (10c), and two ends of the pressing spring (11c) are respectively connected with the voltage-sharing terminal (10 c).