330kV external series insulator gap line lightning arrester

Abstract

The utility model discloses a 330kV external series insulator gap line lightning arrester. The 330kV external series insulator gap line lightning arrester comprises two sections of lightning arrester elements which are connected in series, a plurality of resistor disc columns which are connected in series are arranged in each section of lightning arrester element, and a silicon rubber jacket sleeves the outer side of each section of lightning arrester element; an insulating base is arranged at the upper end of the upper end lightning arrester element; the lower end of the lower end lightning arrester element is mounted at the upper end of the supporting gap insulator; the lower end of the supporting gap insulator is arranged on the metal suspension clamp and is arranged on a high-voltage wire through the metal suspension clamp; the supporting gap insulator is composed of a composite insulator and two grading rings at the two ends of the composite insulator, and openings of the two grading rings correspond to each other. The lightning arrester provided by the utility model does not act under continuous operation voltage. When a power transmission line lead, an insulator string and a tower are struck by lightning due to overvoltage, the lightning arrester acts to protect the lead, the insulator string and the tower due to discharge of the gap of the supporting gap insulator.

Description

Technical Field

[0001] The utility model belongs to the technical field of lightning arresters, and relates to a lightning arrester suitable for power transmission projects at an altitude of 3,000 meters or less, high voltage level 330kV transmission line projects, and used in the northwest environment of my country, specifically to a 330kV external series insulator gap line lightning arrester. Background Art

[0002] With the rapid development of my country's economy, the State Grid Corporation of China has dramatically increased its investment in transmission line projects, placing greater emphasis on transmission line protection. Due to the changing geographical location and climate, as well as the frequent thunderstorms and other harsh conditions, there is an urgent need to develop lightning arresters that are suitable for these environments, filling the gap in this type of arrester and providing protection for these transmission lines. Utility Model Content

[0003] The purpose of this utility model is to provide a 330kV external series insulator gap line arrester suitable for power transmission projects at an altitude of 3000 meters or below and 330kV voltage level transmission line projects, so as to fill the gap of such arresters and play a protective role for such transmission lines.

[0004] The technical solution adopted by the utility model is: the lightning arrester includes two lightning arrester elements connected in series, and its characteristics are:

[0005] Each lightning arrester element is equipped with multiple series-connected resistor columns and a silicone rubber jacket on the outside;

[0006] An insulating base is provided at the upper end of the upper arrester element;

[0007] The lower end of the lower end arrester element is mounted on the upper end of the supporting gap insulator;

[0008] The lower end of the support gap insulator is mounted on a metal suspension clamp and is mounted on the high-voltage line conductor through the metal suspension clamp;

[0009] The support gap insulator is composed of a composite insulator and two grading rings at both ends thereof, and the openings of the two grading rings correspond to each other.

[0010] Since the outer surface of the lightning arrester body component of the utility model adopts a silicone rubber jacket, it has the following advantages compared with the lightning arrester with a porcelain jacket: 1) the jacket is made of organic (composite) material and has excellent aging resistance; 2) it has anti-ultraviolet and anti-ozone properties; 3) it has hydrophobic properties; 4) it has low temperature resistance and still maintains elasticity at -50°C; 5) its elastic and soft nature gives it good explosion-proof performance; 6) it has a small size, light weight, and good anti-fouling performance; 7) it is easy to install and maintain.

[0011] The utility model is directly installed on the iron tower via a metal suspension clamp and high-voltage line conductors, adopting a suspended installation method, providing excellent protection for the transmission line and the iron tower. Furthermore, because the lower ends of the two lightning arrester elements are equipped with support gap insulators with two grading rings, the two grading rings are spaced apart, typically by a distance of 1340±50mm, enabling gap discharge to form in the support gap insulators. Thus, the lightning arrester of the utility model does not operate under continuous operating voltage. When an overvoltage lightning strikes the transmission line conductors, insulator strings, and towers, the lightning arrester of the utility model operates due to gap discharge in the support gap insulators, providing protection.

[0012] The utility model has the following features:

[0013] 1. Mechanical strength: According to the requirements of DL / T815-2021, when conducting mechanical load tests, the mechanical strength design of the line arrester is 29kN tensile load performance, which is much greater than the product design requirement of 20kN.

[0014] 2. Arrester short-circuit current release performance. The structural design incorporates a unique short-circuit current release device. Test results show that the arrester can release current normally. The short-circuit current capacity reaches 63kA, far exceeding the standard requirement of 50kA. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 This is a schematic structural diagram of the lightning arrester component of the utility model;

[0017] Figure 3 This is a schematic structural diagram of the support gap insulator of the utility model;

[0018] Figure 4a 、 Figure 4b All of them are structural schematic diagrams of the pressure equalizing ring of the present invention.

[0019] In the figure: 1- lightning arrester element; 2- grading ring; 3- composite insulator; 4- metal right-angle hanging plate; 5- insulation base; 6- metal suspension clamp; 7- silicone rubber jacket; 8- large umbrella; 9- small umbrella; 10 flange; 11- insulation tube; 12- resistor; 13- aluminum electrode; 14- composite insulator hardware; 15- composite insulator large umbrella; 16- composite insulator small umbrella; 17- supporting gap insulator. DETAILED DESCRIPTION

[0020] like Figure 1As shown in Figure 4, the utility model includes two sections of arrester elements 1 connected in series. Each section of the arrester element 1 is provided with a plurality of resistor plates connected in series, and a silicone rubber jacket 7 is provided on the outside. The upper end of the upper arrester element 1 is provided with an insulating base 5. The lower end (i.e., the high-voltage end) of the lower arrester element 1 is installed on the upper end of the supporting gap insulator 17. The lower end of the supporting gap insulator 17 is installed on the metal suspension clamp 6, and is installed on the high-voltage line conductor through the metal suspension clamp 6, and thus installed on the iron tower. The supporting gap insulator 17 is composed of a composite insulator 3 and two grading rings 2 at its two ends, and the openings of the two grading rings 2 correspond to each other.

[0021] The insulating base 5 and the upper arrester element 1 , the two sections of the arrester element 1 , and the lower arrester element 1 and the supporting gap insulator 17 are all connected via metal right-angled hanging plates 4 .

[0022] like Figure 2 As shown, each arrester element 1 is 1370mm tall and weighs 35kg, with flanges 10 at both ends. The internal resistor column is composed of multiple resistors 12 connected in series. The number of resistors 12 in each column is determined by the required use. The multiple series-connected resistor columns are separated by aluminum electrodes 13 to adjust the uniformity of the resistor column distribution within the arrester element 1. The resistors 12 measure φ71mm x 22.5mm, a conventional resistor. Without upgrading the product structure, they can meet the special parameter requirements of the arrester, thereby meeting the more specific energy and pressure ratio performance requirements of the arrester. Furthermore, this new product can still meet the installation requirements in harsh environments.

[0023] The umbrella shape of the silicone rubber jacket 7 adopts an alternating structure of large umbrellas 8 and small umbrellas 9. The outer diameter of the large umbrella 8 is φ206mm, and the outer diameter of the small umbrella 9 is φ178mm. The small umbrella 9 extends 30.5mm, the umbrella spacing is 33mm, and the minimum creepage distance of a single section is 3906mm, which far meets the pollution level requirements (creepage distance = 17mm / kV×363kV / 2 = 3086mm).

[0024] In the figure, 11 is an insulating tube, which is made of epoxy resin and glass fibers solidified. It has high strength and plays a role of skeleton support in the arrester element 1.

[0025] like Figure 3 As shown, composite insulator hardware 14 is provided at both ends of the composite insulator 3, and the grading rings 2 at both ends are respectively mounted on the composite insulator hardware 14 at both ends; the umbrella shape on the outside of the composite insulator 3 adopts an alternating structure of a large composite insulator umbrella 15 and a small composite insulator umbrella 16; the outer diameter of the large composite insulator umbrella 15 is φ150mm; the outer diameter of the small composite insulator umbrella 16 is φ120mm.

[0026] The technical parameters of this utility model are shown in the table below:

[0027]

[0028]

Claims

1. A 330 kV external series insulator gap line arrester, comprising two series-connected arrester elements (1), characterized in that: Each lightning arrester element (1) is provided with a plurality of series-connected resistor plates inside and is covered with a silicone rubber jacket (7) on the outside; An insulating base (5) is provided at the upper end of the upper arrester element (1); The lower end of the lower end lightning arrester element (1) is mounted on the upper end of the supporting gap insulator (17); The lower end of the supporting gap insulator (17) is mounted on the metal suspension clamp (6), and is mounted on the high-voltage line conductor through the metal suspension clamp (6); The supporting gap insulator (17) is composed of a composite insulator (3) and two grading rings (2) at both ends thereof, and the openings of the two grading rings (2) correspond to each other.

2. A 330kV external series insulator gap line arrester according to claim 1, characterized in that: The insulating base (5) and the upper lightning arrester element (1), the two sections of the lightning arrester element (1), and the lower lightning arrester element (1) and the supporting gap insulator (17) are all connected via metal right-angle hanging plates (4).

3. The 330kV external series insulator gap line arrester according to claim 1, characterized in that: Each lightning arrester element (1) is provided with flanges (10) at both ends; the internal resistor column is composed of a plurality of resistors (12) connected in series, the number of resistors (12) in each resistor column is determined according to usage requirements, and the plurality of resistor columns connected in series are separated in sections by aluminum electrodes (13).

4. The 330kV external series insulator gap line arrester according to claim 1, characterized in that: The umbrella shape of the silicone rubber outer cover (7) adopts a large umbrella (8) and a small umbrella (9) alternating structure, the large umbrella (8) has an outer diameter of φ206mm, and the small umbrella (9) has an outer diameter of φ178mm; the small umbrella (9) extends 30.5mm, the umbrella spacing is 33mm, and the minimum creepage distance of a single section is 3906mm.

5. The 330kV external series insulator gap line arrester according to claim 1, characterized in that: Composite insulator hardware (14) is provided at both ends of the composite insulator (3), and the grading rings (2) at both ends are respectively sleeved on the composite insulator hardware (14) at both ends; the umbrella shape on the outside of the composite insulator (3) adopts an alternating structure of a large composite insulator umbrella (15) and a small composite insulator umbrella (16); the outer diameter of the large composite insulator umbrella (15) is φ150 mm; the outer diameter of the small composite insulator umbrella (16) is φ120 mm.

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