CN103812009A - Serially adjustable gap puffer type lightning arrester for overhead transmission line - Google Patents

Abstract

The invention relates to a series adjustable gap blowing arc arrester for overhead power transmission lines, which belongs to the technical field of power facility components. Including multiple chamber electrodes, multiple arc extinguishing chambers, upper and lower connecting rods, low-voltage ring electrodes and high-voltage ring electrodes, etc.; multiple chamber electrodes are arranged in the insulating sleeve at intervals, and multiple chamber electrodes connect the insulating sleeve Separated into multiple arc extinguishing chambers, one side of the arc extinguishing chamber is provided with an air jet hole, the low-voltage ring electrode is fixed on the lower connecting rod through the positioning nut inserted into the positioning hole, the high-voltage ring electrode is fixed on the upper connecting rod, and the upper connecting rod The upper end is provided with a wire clamp, and the overhead transmission line passes through the wire clamp. The lightning arrester of the invention has simple structure, convenient installation and definite functions, can effectively cut off the discharge arc caused by the overvoltage of the line, and ensures the safety and reliability of the power system.

Description

A series adjustable gap blowing arc arrester for overhead transmission lines

technical field

The invention relates to a series adjustable gap blowing arc arrester for overhead transmission lines, belonging to the technical field of power facility components.

Background technique

Installing surge arresters with series gaps on overhead transmission lines can effectively discharge overvoltage and protect insulator strings from burning by discharge arcs when the line is struck by lightning or insulator strings flashover. Ordinary surge arresters with series gaps can effectively absorb the overvoltage on the line, break down the air gap, and guide the overvoltage to the ground. However, this lightning arrester has the problems of being unable to automatically extinguish the arc and that the series gap distance is not fixed.

When the discharge gap and the power frequency freewheeling arc caused by the breakdown of the air gap cannot be automatically extinguished, a better lightning protection effect can only be obtained if it is used in conjunction with the automatic reclosing device. However, due to the need to wait for the circuit breaker to operate, it takes a long time to extinguish the arc on the series gap. Every time the overvoltage on the line is released to the ground, it may cause the metal fittings to be burned by the arc, or even burn the wire in severe cases.

As the arrester runs on the line, the distance of the discharge gap will change due to external force or loose fasteners. The increase of the discharge gap distance leads to the increase of the discharge gap discharge voltage. When the overvoltage occurs on the line, the arrester cannot work normally; the decrease of the discharge distance leads to the reduction of the discharge gap discharge power, which makes the arrester too sensitive. In severe cases, the arrester will be under power frequency. The discharge causes a single-phase ground short circuit fault.

Contents of the invention

The invention proposes a series adjustable gap arc-blowing arrester for overhead transmission lines, which improves the structure of the existing arrester to solve the problems in the prior art that the power-frequency freewheeling arc cannot be automatically extinguished and the discharge gap is not enough. Fixed issue.

The series adjustable gap arc blowing arrester for overhead transmission lines proposed by the present invention includes a connecting base, a connecting cylinder, an insulating sleeve, a thin-walled steel pipe, a plurality of chamber electrodes, a plurality of arc extinguishing chambers, mandrels, and cores. Rod insulation layer, lower connecting rod, low-voltage ring electrode, isolation insulator, upper connecting rod, high-voltage ring electrode and wire clamp; the connecting base is used to fix the lightning arrester on the lower end of the insulator or the pole tower of the overhead transmission line, The connecting cylinder is provided with a hole equal in diameter to the chamber electrode and mandrel, which is used to insert the chamber electrode and mandrel into the connecting cylinder so that the lightning arrester is connected to the connection base; the plurality of chamber electrodes Arranged at intervals in the insulating sleeve, a plurality of chamber electrodes separate the insulating sleeve into multiple arc extinguishing chambers, and one side of the arc extinguishing chamber is provided with a gas injection hole; the thin-walled steel pipe is placed between the insulating sleeve and the chamber electrodes between; the mandrel is placed at the bottom of the insulating sleeve, and the mandrel insulating layer is wrapped around the mandrel; the low-voltage annular electrode is fixed on the lower connecting rod through the positioning nut inserted into the positioning hole, and the lower The lower end of the connecting rod is connected to the chamber electrode, and the upper end of the lower connecting rod is relatively fixed to the lower part of the isolation insulator; the high-voltage ring electrode is fixed on the upper connecting rod, and the lower end of the upper connecting rod The upper part of the isolation insulator is relatively fixed, and the upper end of the upper connecting rod is provided with a wire clamp, and the overhead transmission line passes through the wire clamp.

The arc-blowing arrester with adjustable gaps in series for overhead transmission lines proposed by the present invention has the advantages that: compared with the existing surge arresters with series gaps, the arrester of the present invention utilizes the high-speed airflow generated by high temperature in each arc extinguishing chamber to The small arc in the arc extinguishing chamber is cut off, and then the large arc is automatically cut off; the discharge gap distance of the series adjustable gap arc blowing low-voltage arrester of the present invention is fixed, and it can be adjusted to a suitable discharge distance according to different voltage levels on the low-voltage line to avoid The problem of changing the discharge gap due to the influence of external factors is solved; the high-voltage electrode in the arrester of the present invention can lead the root of the arc from the wire to the high-voltage ring electrode, avoiding the damage of the high-temperature arc to the wire during the arc-extinguishing action. burning, thereby preventing the occurrence of disconnection accidents. The lightning arrester of the present invention can keep the discharge gap distance constant during long-term operation, ensuring the normal operation of the lightning arrester; the discharge gap distance can be adjusted according to the specific requirements such as the line voltage level during installation, and the discharge gap on each stage of the tower can be adjusted The constant distance guarantees a standardized installation. The lightning arrester of the invention has the advantages of simple structure, convenient installation and definite function, can effectively cut off the discharge arc caused by the overvoltage of the line, and ensures the safety and reliability of the power system.

Description of drawings

Fig. 1 is a structural schematic diagram of a series adjustable gap blowing arc arrester for overhead transmission lines proposed by the present invention.

Fig. 2 is a view along the direction A of Fig. 1 .

Fig. 3 is a B-B sectional view of Fig. 1 .

In Figure 1, Figure 2 and Figure 3, 1 is the connecting base, 2 is the connecting cylinder, 3 is the insulating sleeve, 4 is the mandrel, 5 is the insulating layer of the mandrel, 6 is the thin-walled steel pipe, 7 is the air injection hole, 8 is the chamber electrode, 9 is the arc extinguishing chamber, 10 is the lower connecting rod, 11 is the positioning hole, 12 is the positioning nut, 13 is the low-voltage ring electrode, 14 is the high-voltage ring electrode, 15 is the wire clamp, and 16 is the upper Connecting rod, 17 is the isolation insulator.

Detailed ways

The arc-blowing arrester with adjustable gaps in series for overhead transmission lines proposed by the present invention has a structure as shown in Figure 1, including a connecting base 1, a connecting cylinder 2, an insulating sleeve 3, a thin-walled steel pipe 6, and a plurality of chambers Electrode 8, multiple arc extinguishing chambers 9, mandrel 4, mandrel insulation layer 5, lower connecting rod 10, low-voltage ring electrode 13, isolation insulator 17, upper connecting rod 16, high-voltage ring electrode 14 and wire clamp 15 . The connection base 1 is used to fix the arrester on the lower end of the insulator or the tower of the overhead transmission line, and the connection cylinder 2 has a hole equal to the diameter of the chamber electrode 8 and the mandrel 4, which is used to insert the cavity into the connection cylinder 2. Chamber electrodes and mandrels, so that the arrester is connected to the connection base 1. A plurality of chamber electrodes 8 are arranged at intervals in the insulating bushing 3 , and the plurality of chamber electrodes 8 divide the insulating bushing 2 into a plurality of arc extinguishing chambers 9 , and one side of the arc extinguishing chamber 9 has a gas injection hole 7 . The thin-walled steel pipe 6 is placed between the insulating sleeve 3 and the chamber electrode 8 . The mandrel 4 is placed at the bottom of the insulating sleeve 2 , and the mandrel insulating layer 5 is wrapped around the mandrel 4 . As shown in Figure 3, the low-voltage annular electrode 13 is fixed on the lower connecting rod 10 through the positioning nut 12 inserted into the positioning hole 11, the lower end of the lower connecting rod 10 is connected with the chamber electrode 8, and the upper end of the lower connecting rod 10 is connected to the isolation The lower part of the insulator 17 is relatively fixed. The high-voltage ring electrode 14 is fixed on the upper connecting rod 16, the lower end of the upper connecting rod 16 is relatively fixed to the upper part of the isolation insulator 17, and the upper end of the upper connecting rod 16 is provided with a wire clamp 15, and the overhead transmission line passes through the wire Clip 15, as shown in Figure 2.

In the series adjustable gap blowing arc arrester for overhead power transmission lines proposed by the present invention, the discharge gap is fixed on the wire through the wire clamp; the adjustable low-voltage annular electrode and the connecting rod are each provided with round holes with equal diameters. The purpose of adjusting the gap is achieved by adjusting the cooperation between the circular hole of the low-voltage ring electrode and the five connecting holes, and the adjusted gap distance will not change with time. The outer layer of the arc blowing arrester is an insulating sleeve, and the insulating sleeve is wrapped with chamber electrodes one by one. The number of chamber electrodes is determined according to the line voltage level. The electrodes of the chamber are arranged at intervals in the insulating sleeve, and the insulating sleeve is divided into individual arc extinguishing chambers. There is a gas injection hole for high-speed gas ejection on one side of the arc extinguishing chamber. There is a layer of thin-walled steel pipe between the insulating sleeve of the arc blowing arrester and the electrode of the chamber, which plays a role of fixing and shaping. There is a mandrel at the bottom of the insulating sleeve to support the entire arrester. Half of the electrode at the right end of the arc blowing arrester is wrapped by an insulating sleeve, and the other half is connected with a connecting rod. The left end of the arc blowing arrester is connected with the metal base. The fixing seat part of the metal base is in the shape of a wire clip, which can fix the lightning arrester on the lower end of the insulator or on the pole tower. The connecting cylinder part of the metal base has a hole equal in diameter to the chamber electrode and mandrel, which is inserted into the chamber electrode and mandrel to connect the arrester to the metal base.

The lightning arrester of the present invention uses the adjustable low-voltage annular electrode at the top of the arc-blowing arrester to lead the arc into the arc-extinguishing chamber of the arrester, generates high temperature through the discharge of the chamber electrodes in the arc-extinguishing chamber, heats the air, releases high-speed gas to cut off the arc, and completes the arrester. Automatic arc extinguishing function.

Claims (1)

1. A series adjustable gap arc blowing arrester for overhead transmission lines, characterized in that the series adjustable gap arc blowing arrester includes a connecting base, a connecting cylinder, an insulating sleeve, a thin-walled steel pipe, and a plurality of chambers electrodes, multiple arc extinguishing chambers, core rods, core rod insulation, lower connecting rods, low-voltage ring electrodes, isolation insulators, upper connecting rods, high-voltage ring electrodes and wire clamps; the connection base is used to connect the lightning arrester It is fixed on the lower end of the insulator or the tower of the overhead transmission line. The connecting cylinder has a hole equal to the diameter of the chamber electrode and mandrel, which is used to insert the chamber electrode and mandrel into the connecting cylinder, so that the arrester and the connection The bases are connected; the plurality of chamber electrodes are arranged at intervals in the insulating sleeve, and the plurality of chamber electrodes divide the insulating sleeve into a plurality of arc extinguishing chambers, and one side of the arc extinguishing chamber has a gas injection hole; the described The thin-walled steel pipe is placed between the insulating sleeve and the chamber electrode; the mandrel is placed at the bottom of the insulating sleeve, and the insulating layer of the mandrel is wrapped outside the mandrel; the low-voltage ring electrode is inserted The positioning nut of the positioning hole is fixed on the lower connecting rod, the lower end of the lower connecting rod is connected with the chamber electrode, and the upper end of the lower connecting rod is relatively fixed with the lower part of the isolation insulator; the high-voltage ring electrode Fixed on the upper connecting rod, the lower end of the upper connecting rod is relatively fixed to the upper part of the isolation insulator, the upper end of the upper connecting rod is provided with a wire clamp, and the overhead transmission line passes through the wire clamp.

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