CN-121983859-A - Thunder and lightning overvoltage protection device

Abstract

The application relates to the technical field of power transmission and distribution equipment, in particular to a lightning overvoltage protection device which comprises a conductive piece, a grounding piece, a first multi-chamber arc extinguishing device and a second multi-chamber arc extinguishing device, wherein the conductive piece is connected to the high-voltage end of an insulator; the first multi-chamber arc extinguishing device is electrically connected to the conductive piece and provided with a first end deviating from the conductive piece, the second multi-chamber arc extinguishing device is electrically connected to the ground piece and provided with a second end deviating from the ground piece, the second end and the first end are oppositely arranged at intervals, a breakdown gap is formed between the first end and the second end, the first multi-chamber arc extinguishing device and the second multi-chamber arc extinguishing device are not rigidly connected, and the maximum bending moment born by the first multi-chamber arc extinguishing device and the second multi-chamber arc extinguishing device in the arc extinguishing process is far smaller than that of the integral multi-chamber arc extinguishing device in the existing structure, so that the requirements of a high-voltage power grid are better met.

Inventors

• YI YONGLI
• LIU CHONG
• WAN XIAO
• SUN JIN
• WU BAOXING
• ZHOU YUZHI
• YE ZHENGCE
• ZHENG ZHONG
• ZHANG QIAN
• PAN QIANQIAN
• LI ZEZHENG
• CHEN RONGZHU
• ZHU CHENYAN
• WANG ZHANG
• XU JIYAO
• ZHOU TAIBIN
• WANG JIAXING
• CAO HUI
• TANG YAOJING
• SHI YIZHI
• Chen Jituo

Assignees

• 国网浙江省电力有限公司温州供电公司

Dates

Publication Date

20260505

Application Date

20260403

Claims (10)

1. 1. A lightning overvoltage protection device for protecting an insulator (100), comprising: a conductive member (1) connected to the high voltage end of the insulator (100); A grounding member (2) connected to a grounding end of the insulator (100); A first multi-chamber arc extinguishing device (3) electrically connected to the conductive member (1) and having a first end (31) facing away from the conductive member (1); A second multi-chamber arc extinguishing device (4) electrically connected to the ground (2) and having a second end (41) facing away from the ground (2); wherein the second end (41) is arranged in a spaced relation to the first end (31) to form a breakdown gap (5) between the first end (31) and the second end (41).
2. 2. The lightning overvoltage protection device according to claim 1, the lightning overvoltage protection device is characterized by further comprising: A first striking element (6) connected to said first end (31); A second striking element (7) connected to said second end (41); The second arc striking piece (7) and the first arc striking piece (6) are arranged at intervals relatively, and a gap between the second arc striking piece (7) and the first arc striking piece (6) forms the breakdown gap (5).
3. 3. Lightning overvoltage protection means according to claim 2, characterized in that the end of the first striking element (6) facing the second striking element (7) has a first arc surface (61) protruding outwards, the end of the second striking element (7) facing the first striking element (6) has a second arc surface (71) protruding outwards, the second arc surface (71) and the first arc surface (61) are arranged opposite, and the gap between the first arc surface (61) and the second arc surface (71) forms the breakdown gap (5).
4. 4. A lightning overvoltage protection device according to claim 3, characterized in that the first cambered surface (61) and the second cambered surface (71) are hemispherical surfaces.
5. 5. Lightning overvoltage protection means according to claim 2, characterized in that the material of the first and second striking elements (6, 7) is a high-temperature resistant alloy.
6. 6. The lightning overvoltage protection device according to any one of claims 1 to 5, characterized in that at least one of the first multi-chamber arc extinguishing device (3) and the second multi-chamber arc extinguishing device (4) is provided with an arc extinguishing skeleton (8); the arc-extinguishing skeleton (8) is provided with an axis (Z), the arc-extinguishing skeleton (8) comprises a plurality of layers of first arc-extinguishing units (81) which are sequentially arranged at intervals along the axis (Z), the first arc-extinguishing units (81) are of annular structures with notches (811), the first arc-extinguishing units (81) are provided with the axis (Z), the first arc-extinguishing units (81) comprise a plurality of first arc-extinguishing shells (812) and a plurality of first electric conductors (813), ring body parts of the first arc-extinguishing units (81) are formed by alternately arranging the first arc-extinguishing shells (812) and the first electric conductors (813) around the axis (Z), and in the length direction of the axis (Z), the notches (811) of at least two layers of adjacent first arc-extinguishing units (81) are oppositely arranged.
7. 7. The lightning overvoltage protection device according to claim 6, characterized in that the first multi-chamber arc extinguishing device (3) and/or the second multi-chamber arc extinguishing device (4) provided with the arc extinguishing skeleton (8) further comprises a base body (10) and a reinforcing column (9), both the arc extinguishing skeleton (8) and the reinforcing column (9) being embedded within the base body (10); The reinforcement columns (9) extend through the respective indentations (811) opposite in the direction of the axis (Z).
8. 8. The lightning overvoltage protection device according to claim 6 wherein the number of arc extinguishing chambers in the first multi-chamber arc extinguishing device (3) and the second multi-chamber arc extinguishing device (4) are the same.
9. 9. The lightning overvoltage protection device according to claim 6, wherein the first arc extinguishing shell (812) has an arc extinguishing chamber, the first arc extinguishing shell (812) comprises a first expansion section (8121), a necking section (8122) and a second expansion section (8123) which are sequentially connected and enclose the arc extinguishing chamber, the first conductor (813) is connected to the first expansion section (8121), and a port (8124) communicating with the arc extinguishing chamber is provided at an end of the second expansion section (8123) facing away from the first expansion section (8121).
10. 10. The lightning overvoltage protection device according to claim 6, wherein the arc extinguishing skeleton (8) further comprises a second arc extinguishing unit (82), the second arc extinguishing unit (82) connecting two adjacent layers of the first arc extinguishing units (81), the second arc extinguishing unit (82) comprising at least one second electrical conductor (821) and a second arc extinguishing shell (822) alternately arranged.

Description

Thunder and lightning overvoltage protection device Technical Field The application relates to the technical field of power transmission and distribution equipment, in particular to a lightning overvoltage protection device. Background The multi-chamber arc extinguishing device is a key device for protecting an insulator of a power line from arc breakdown when a power distribution network suffers lightning stroke or transient overvoltage. The electric arc is divided into a plurality of independent chambers connected in series, and high-speed gas jet flow is generated by utilizing the energy of the electric arc, so that quick arc extinction is realized. The device has the advantages of quick response, no need of external energy, simplicity and convenience in maintenance and the like, and has good protection effect in a medium-low voltage distribution network of 10kV to 35 kV. In such a medium-low voltage distribution network, the multi-chamber arc extinguishing device mostly adopts an integral columnar structure, and arc extinguishing chambers are serially arranged in columnar insulators along an axis. The multi-chamber arc extinguishing device is arranged on one side of the insulator in a cantilever type structure. The lower end of the multi-chamber arc extinguishing device is connected to the grounding plate, the upper end is a free end, and a certain gap is kept between the lower end and an electrode plate connected to the high-voltage end of the insulator. When lightning strike or overvoltage exists, a gap between the free end and the electrode plate breaks down, and an electric arc rushes into the arc extinguishing device to be extinguished, so that the insulator is protected. However, as the voltage level increases to 110kV and above, the conventional multi-chamber arc extinguishing device faces serious challenges and its application is restricted. The main reason is that, in order to meet the higher voltage arc extinguishing requirements, the number of arc extinguishing chambers required by the multi-chamber arc extinguishing device is increased, resulting in a significantly longer axial dimension of the multi-chamber arc extinguishing device. When the multi-chamber arc extinguishing device is installed in a cantilever mode, the suspension part of the free end of the multi-chamber arc extinguishing device is longer, and a long cantilever structure is formed. The second point is that the overvoltage value of the multi-chamber arc extinguishing device in the high-voltage power grid is higher than that of the low-voltage power grid when the multi-chamber arc extinguishing device is struck by lightning, so that the arc energy is larger, and the high-strength mechanical impact and airflow recoil generated at the moment of arc extinguishing are multiplied. Under the combined action of the long cantilever and high impact, the root bending moment born by the multi-chamber arc extinguishing device is larger, and bending deformation or structural damage is easy to occur. The structural failure not only affects the arc extinguishing performance, but also threatens the line safety, which is a main reason that the existing multi-chamber arc extinguishing device cannot be widely applied to a high-voltage power grid. Disclosure of Invention Based on this, an object of the present application is to provide a lightning overvoltage protection device for protecting an insulator, the lightning overvoltage protection device comprising: the conductive piece is connected to the high-voltage end of the insulator; the grounding piece is connected with the grounding end of the insulator; the first multi-chamber arc extinguishing device is electrically connected to the conductive piece and is provided with a first end which faces away from the conductive piece; The second multi-chamber arc extinguishing device is electrically connected with the grounding piece and is provided with a second end which is away from the grounding piece; Wherein the second end is spaced opposite the first end to form a breakdown gap between the first end and the second end. As an alternative, the lightning overvoltage protection device further includes: the first arc striking piece is connected to the first end; The second arc striking piece is connected to the second end; The second arc striking piece and the first arc striking piece are arranged at intervals relatively, and a gap between the second arc striking piece and the first arc striking piece forms the breakdown gap. As an alternative scheme, the first arc striking piece is towards the one end of second arc striking piece has outwards convex first cambered surface, the second arc striking piece is towards the one end of first arc striking piece has outwards convex second cambered surface, the second cambered surface with first cambered surface is arranged relatively, the clearance between the first cambered surface with the second cambered surface forms the breakdown clearance. Alternativel