Multifunctional + / -800kV direct current power transmission line lightning arrester

Abstract

The utility model discloses a multifunctional lightning arrester for a + / -800kV direct current transmission line, which comprises four sections of lightning arrester elements connected in series, a composite jacket is sleeved outside each section of lightning arrester element, and a resistor disc column is arranged inside each section of lightning arrester element. A lower annular electrode is arranged at the upper end of the top lightning arrester element, an upper annular electrode is arranged at the upper part of the lower annular electrode, and the upper annular electrode is arranged on the high-voltage wire rack and is connected with the high-voltage wire. And the two annular electrodes and air between the two annular electrodes form an air gap. And the lower end of the bottom lightning arrester element is provided with an insulating base and is connected to the high-voltage tower body through the insulating base. The outer side of the bottom lightning arrester element is provided with inclined supporting insulators, and the upper end of each supporting insulator is connected with the upper end of the bottom lightning arrester element. The utility model has various installation modes, is suitable for installation of various towers, has the advantages of compact structure, short length, light weight, high operation reliability and the like, and can better improve the operation reliability of line insulators and power transmission lines.

Description

Technical Field

[0001] The utility model belongs to the technical field of lightning arresters and relates to a multi-functional ±800 kV DC transmission line lightning arrester. Background Art

[0002] With the increasing scale of power transmission, the continuous improvement of voltage levels, and the requirements for improving power transmission efficiency and building a reliable, efficient, and environmentally friendly power grid, it is crucial to protect the safe operation of transmission lines. Due to the variety of types of transmission line towers, the installation method of lightning arresters needs to be adjusted according to the type of tower. Therefore, the ±800 kV DC transmission line lightning arrester requires diverse designs with multiple installation methods to ensure that it can be installed on various types of towers to protect the tower insulators to operate safely and reliably. Currently, there is no report on lightning arresters with multiple installation methods, making it difficult to meet the actual work requirements. Content of the Utility Model

[0003] The purpose of the utility model is to provide a multi-functional ±800 kV DC transmission line lightning arrester, which has multiple installation methods and greatly meets the actual work requirements.

[0004] The technical solution adopted by the utility model is as follows: The lightning arrester includes 4 series-connected lightning arrester elements, and its characteristics are:

[0005] A composite outer sheath is sleeved outside each lightning arrester element, and a column of resistive elements is arranged inside;

[0006] A lower annular electrode is provided at the upper end of the top lightning arrester element, and an upper annular electrode is arranged at intervals and correspondingly above the lower annular electrode. The upper annular electrode is installed on the high-voltage wire rack of the high-voltage tower and is connected to the high-voltage wire; The two annular electrodes and the air between them form an air gap;

[0007] An insulating base is provided at the lower end of the bottom lightning arrester element, and it is connected to the high-voltage tower through the insulating base; Two inclined support insulators are arranged outside the bottom lightning arrester element, and the upper end of each support insulator is connected to the upper end of the bottom lightning arrester element.

[0008] The function of the utility model is to limit the lightning overvoltage of the transmission line and improve the lightning withstand level of the line. It can significantly reduce the tripping rate of system lightning strike faults, thereby improving the stability of the DC transmission system. It has multiple installation methods, is suitable for the installation of various towers, and has the advantages of compact structure, short length, light weight, and high operation reliability, etc., and can better improve the reliability of line insulators and the operation of transmission lines.

[0009] The utility model has the following characteristics: 1. Considering the inconvenient transportation due to the rugged mountain roads, the utility model adopts a 4-section structure. The weight of a single-section element is about 145 kg. Compared with conventional products, the volume of a single-section element is smaller and the weight is lighter. It can be transported in a split form, which is more convenient for handling and on-site installation in remote mountainous areas. 2. Considering different installation methods, a flexible installation method is adopted. The lightning arrester element of the present invention adopts a special structure inside and can adopt various installation methods, such as vertical installation, diagonal tension installation, inverted installation, horizontal installation, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of the utility model;

[0011] Figure 2a is a top view of the upper annular electrode of the utility model;

[0012] Figure 2b is a side view of the upper annular electrode of the utility model

[0013] Figure 3a is a top view of the lower annular electrode of the utility model;

[0014] Figure 3b is a side view of the lower annular electrode of the utility model;

[0015] Figure 4 is a schematic structural diagram of the lightning arrester element of the utility model;

[0016] Figure 5 is a schematic internal structure diagram of the lightning arrester element of the utility model;

[0017] Figure 6 is a schematic structural diagram of the support insulator of the utility model.

[0018] In the figure: 1 - upper annular electrode; 2 - lower annular electrode; 3 - lightning arrester element; 4 - support insulator; 5 - insulating base; 6 - large umbrella; 7 - small umbrella; 8 - spring; 9 - contact; 10 - resistor chip; 11 - upper electrode; 12 - lower electrode; 13 - lower positioning electrode; 14 - composite outer sheath; 15 - high-voltage wire; 16 - high-voltage wire holder. DETAILED DESCRIPTION OF THE INVENTION

[0019] Such as Figure 1 Figure 2, Figure 3, Figure 6As shown in the figure, the utility model includes four series-connected lightning arrester elements 3, which are connected by bolts. A composite outer sheath 14 is sleeved outside each lightning arrester element 3, and a column of resistor chips is arranged inside. A lower annular electrode 2 is provided at the upper end of the top lightning arrester element 3, and an upper annular electrode 1 is arranged at intervals and correspondingly above the lower annular electrode 2. The upper annular electrode 1 is installed on the high-voltage wire rack 16 of the high-voltage tower body and is connected to the high-voltage wire 15. An air gap is formed by the two annular electrodes and the air between them. An insulating base 5 is provided at the lower end of the bottom lightning arrester element 3, and it is connected to the high-voltage tower body through the insulating base 5. Two inclined support insulators 4 are arranged outside the bottom lightning arrester element 3, and the upper end of each support insulator 4 is connected to the upper end of the bottom lightning arrester element 3.

[0020] The total height of the utility model is about 7184 mm, the height of each lightning arrester element is about 1700 mm, the maximum outer umbrella diameter is φ338 mm, and the total weight is 850 kg.

[0021] Considering the needs of vertical installation and suspension installation, the cementing ratio of the lower two lightning arrester elements and the thickness ratio of the insulating cylinder are larger than those of the upper two lightning arrester elements. While minimizing the product weight to the greatest extent, it is more conducive to vertical installation and suspension installation. After the product is installed, the stresses borne by each element are similar, and the bending resistance is better than that of conventional line lightning arresters. The bending load required by the tender is 1 kN, and the actual bending load of the product is as high as 5 kN. The tensile strength can also reach more than 20 times the self-weight, which is 30% higher than the standard requirement.

[0022] As Figure 4 shown, the umbrella shape of the composite outer sheath 14 all adopts a large umbrella 6, a small umbrella 7, and a smooth umbrella structure without ribs under the umbrella. Its inner diameter is φ140 mm and its outer diameter is φ178 mm; the large umbrella 6 extends 80 mm, the small umbrella 7 extends 65 mm, the upward inclination angle of the umbrella is 18°, the downward inclination angle of the umbrella is 7°, the umbrella spacing is 72 mm, and the creepage distance of the lightning arrester is not less than 5100 mm.

[0023] As Figure 5 shown, the column of resistor chips is composed of three sections, and each section of the column of resistor chips is formed by connecting multiple resistor chips 10 in series; the columns of resistor chips are connected by the insertion of the upper electrode 11 of the upper column of resistor chips and the lower electrode 12 of the lower column of resistor chips; a lower positioning electrode 13 is inserted at the lower end of the lowermost column of resistor chips, and the lower positioning electrode 13 supports the three columns of resistor chips at the inner bottom of the lightning arrester element 3; a contact 9 and a spring 8 are provided at the upper end of the uppermost column of resistor chips, and they play a role in pressing and connecting to realize the conduction of the electrical circuit; the sides of the columns of resistor chips are heat-shrunk into one body with heat-shrinkable tubes.

[0024] Considering the safety and stability of the product, this utility model adopts high-quality D105 resistor chips. Compared with the resistor chips (D78) used in conventional ±800kV DC transmission line arresters, it has a greater protection margin and higher energy tolerance. The voltage ratio of the D105 resistor chip can reach 1.27 under a 500A switching impulse current, and the repetitive transferred charge amount under an 8 / 20μs lightning impulse can reach more than 1.0C.

[0025] The arrester element 3 of this utility model is filled with slightly positive-pressure nitrogen gas inside, and an ethylene propylene diene monomer (EPDM) sealing gasket is installed between the limiting structures between the sealing plate and the outer jacket end face. The sealing air leakage rate (helium mass spectrometer method) ≤6.65×10-6Pa·L / s is better than 10 times the national standard requirement ≤6.65×10-5Pa·L / s.

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

[0027]

[0028]

Claims

1. A multifunctional ±800 kV DC transmission line arrester, the arrester comprising four arrester elements (3) connected in series, characterized in that: Each lightning arrester element (3) is covered with a composite outer jacket (14) on the outside and a resistor column is arranged inside; A lower annular electrode (2) is provided at the upper end of the top lightning arrester element (3), an upper annular electrode (1) is arranged at intervals and correspondingly on the upper part of the lower annular electrode (2), and the upper annular electrode (1) is installed on a high-voltage line rack (16) of the high-voltage tower body and connected to a high-voltage line (15); the two annular electrodes and the air between them form an air gap; An insulating base (5) is provided at the lower end of the bottom arrester element (3), and is connected to the high-voltage tower body through the insulating base (5); two inclined support insulators (4) are arranged outside the bottom arrester element (3), and the upper end of each support insulator (4) is connected to the upper end of the bottom arrester element (3).

2. The multifunctional ±800kV DC transmission line arrester according to claim 1 is characterized in that: The umbrella shape of the composite jacket (14) adopts a large umbrella (6), a small umbrella (7), and a light umbrella structure without edges under the umbrella, with an inner diameter of φ140mm and an outer diameter of φ178mm; the large umbrella (6) extends 80mm, the small umbrella (7) extends 65mm, the upper umbrella inclination angle is 18°, the lower umbrella inclination angle is 7°, the umbrella spacing is 72mm, and the lightning arrester creepage distance is not less than 5100mm.

3. The multifunctional ±800kV DC transmission line arrester according to claim 1 or 2 is characterized in that: The resistor sheet column is composed of three sections, each section of which is composed of a plurality of resistor sheets (10) connected in series; the resistor sheet columns are connected by plugging an upper electrode (11) of an upper resistor sheet column and a lower electrode (12) of a lower resistor sheet column; a lower positioning electrode (13) is plugged into the lower end of the lowest resistor sheet column, and the lower positioning electrode (13) supports the three sections of the resistor sheet column at the inner bottom of the arrester element (3); and a contact (9) and a spring (8) are provided at the upper end of the highest resistor sheet column.

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