CN105762753B - A kind of ± 800 kilovolts of DC line arrester erecting devices and methods - Google Patents

Abstract

The invention discloses a ±800 kV DC line lightning arrester installation device and method. The installation device includes an insulator suspension joint plate 5, a connecting rod 4, an insulating support 7 and a wire spacer bar 1; the insulator suspension joint plate 5 is provided with n Two installation holes 6, n≥3, two of which are used to install two parallel insulator strings 2, and the other installation hole 6 is used to install the connecting rod 4; the connecting rod 4 is an L-shaped hard connecting rod One end of the line arrester body 3 is installed on the base, and the base is installed to the insulator string suspension plate 5 through the connecting rod 4; an insulating support 7 is provided between one end of the line arrester body 3 and the base; the other end of the line arrester body 3 is a high voltage The high-voltage end is installed on the wire spacer bar 1; the line arrester body 3 is parallel to the insulator string 2 installed on the insulator suspension joint plate. The invention is not limited by terrain, external conditions and other factors, has simple installation device, low installation cost and high reliability.

Description

A ±800 kV DC line lightning arrester installation device and method

technical field

The invention relates to the field of lightning protection for transmission lines, in particular to an installation device and method for a ±800 kV DC line lightning arrester.

Background technique

The operation experience of high-voltage transmission lines shows that lightning strikes are the main cause of tripping of transmission lines. In the trip accidents of 66 kV and above transmission lines of the State Grid Corporation of China, lightning trips accounted for more than 40% of the total number of trips. With the increase of the voltage level, the height of the towers of the ±800 kV UHV DC transmission line to the ground increases accordingly, with an average height greater than 60 meters, which increases the risk of lightning tripping of the ±800 kV UHV DC transmission line. In engineering, devices such as reducing grounding resistance, erecting double lightning conductors, and reducing the protection angle of lightning conductors are usually used to reduce the lightning tripping rate. Studies have shown that installing line arresters in line sections with strong lightning activities or high soil resistivity and difficulty in reducing grounding resistance is an effective device to reduce the tripping rate due to lightning strikes. Line arresters can greatly improve the lightning resistance level of transmission lines and reduce the lightning flashover rate of transmission lines.

At present, there are mainly two types of installation methods for line arresters: suspension type and pillar type. The traditional suspension arrester installation device is to install the line arrester by installing the bracket on the cross arm of the pole tower; the traditional pillar type mainly has two types, one is to re-erect the pillar on the ground to install the line arrester; the other is to install the line arrester on the tower body Install the bracket at the place and install the line arrester. For the installation of DC line arresters, pillar installation is mainly used at present. For the towers of ±800 kV DC transmission lines, the average height of the towers is more than 60 meters, and the towers with frequent lightning activities and high risk of lightning strikes are mainly located in complex terrain and landforms such as slopes and mountainous areas, making ±800 kV The installation height of arrester pillars for DC transmission lines is very high, the construction period is long, the cost is high, and it is easily affected by strong winds, causing potential safety hazards. Therefore, there is an urgent need for a convenient and efficient ±800 kV DC line arrester installation device.

Contents of the invention

The object of the present invention is to provide a ±800 kV DC line arrester for the defects of high height of the existing ±800 kV DC transmission line, long construction period, high cost, and large safety hazards of the pillar-type installation method of the line arrester. The installation device, using the device, can realize the convenient and efficient installation of the ±800 kV DC line lightning arrester, reduce the lightning tripping rate, and improve the lightning protection level of the ±800 kV DC line.

To achieve the above object, the present invention adopts the following technical solutions:

A lightning arrester installation device for ±800 kV DC line, comprising an insulator suspension link plate 5, a connecting rod 4, an insulating support 7 and a wire spacer bar 1;

The insulator suspension link plate (5) is provided with n installation holes (6), n≥3, two of which are used to install two parallel insulator strings 2, and the other installation hole 6 is used to install the connecting rod 4 ;

The connecting rod 4 is an L-shaped hard connecting rod;

One end of the line arrester body 3 is installed on the base, and the base is installed to the insulator string suspension link plate 5 through the connecting rod 4 to realize the installation of the line arrester;

An insulating support 7 is provided between one end of the line arrester body 3 and the base, and the line arrester body 3 and the base are insulated through the insulating support 7;

The other end of the line arrester body 3 is a high-voltage end, and the high-voltage end is installed on the wire spacer 1;

The line arrester body 3 is parallel to the insulator string 2 installed on the insulator suspension connecting plate. Since there is a certain air gap insulation requirement between the insulator string and the arrester, in order to prevent the gap distance from being smaller than the required value, the two devices need to be parallel.

The insulator suspension connecting plate 5 is a four-hole connecting plate, on which four installation holes 6 are arranged. Although the present invention only needs to use three mounting holes on the connecting plate, since the double-hole connecting plate and the four-hole connecting plate are UHV engineering standard parts, the use of the four-hole connecting plate is convenient for procurement and assembly, so the present invention adopts the four-hole connecting plate plate. The high voltage end is installed on the wire spacer bar 1 through bolts.

The line arrester is connected to the connecting rod 4 with a discharge counter lead wire 8, so as to record the number of operations of the line arrester.

A hole is opened on the connecting rod 4, and the discharge counter lead wire 8 for the line lightning arrester is installed on the connecting rod 4 through bolts.

An installation method of a ±800 kV DC line arrester, using the above-mentioned ±800 kV DC line arrester installation device, the installation method is as follows:

First, determine the length of the connecting rod 4 perpendicular to the side of the line arrester body according to the minimum safe air gap requirements between the line arrester body 3 and the insulator string 2; carry out force calculation on the connecting rod, and determine to meet the suspension force of the line arrester body 3 Connecting rod type;

Then in the power failure state, the double-hole connecting plate of the suspension insulator is replaced with a four-hole connecting plate; the line arrester body 3 is lifted and installed by a crane, and the base of the line arrester is installed on the four-hole connecting plate through the connecting rod 4, and the line arrester The high voltage end is installed on the wire spacer bar 1;

Finally, the discharge counter leads 8 for the line arrester are installed on the connecting rod 4 .

At present, the insulation configuration of the linear tower of the ±800 kV DC line mostly uses double "V"-shaped insulator strings for suspension, and the double-connected "V"-shaped insulator strings are connected to the tower through double-hole connecting plates. The installation device of the present invention first replaces the double-hole connecting plate with a four-hole connecting plate, and the two insulator strings on one side of the “V”-shaped insulator string are respectively installed on the installation holes of the four-hole connecting plate using bolts.

The base of the line arrester is installed on an "L"-shaped hard connecting rod, and the connecting rod is installed on a four-hole connecting plate for hanging insulator strings to realize the suspension of the line arrester.

The length of the "L"-shaped connecting rod perpendicular to the side of the arrester body needs to meet the minimum safety air gap requirements between the insulator string and the line arrester; according to the "Major Anti-Accident Measures for Trans-District Transmission Lines", the connection spacing should not be less than 600 mm, while meeting the suspension requirements of lightning arresters.

In order to record the operation times of the arrester for the line, an insulating support is installed between the arrester and the base to ensure the normal conduction of the lead wire of the discharge counter. The discharge counter is at the bottom of the arrester. If there is no insulating base, the shunt effect makes the current passing through the discharge counter lead wire fail to meet the counting requirements.

A hole is opened on the "L"-shaped hard connecting rod, and the lead wires of the discharge counter for the line arrester are installed on the "L"-shaped hard connecting rod with bolts.

The high-voltage end of the line arrester is installed on the wire spacer and fixed with the bolts on the wire spacer.

The load margin of the tower of the ±800 kV direct current line is usually more than 2 times, and the installation device of the line lightning arrester of the present invention can meet the load requirement of the tower.

Compared with existing devices, the present invention has the advantages of:

By adopting the installation device of the present invention, the line lightning arrester can be regarded as the third string of insulators when the line is in normal operation, which increases the reliability of the insulators hanging the wires. When the line is struck by lightning, when the overvoltage at the two ends of the insulator exceeds the operating voltage of the arrester, the arrester operates reliably, and the residual voltage of the arrester is limited by the nonlinear volt-ampere characteristics of the valve plate to be lower than the flashover voltage of the line insulator string.

The installation device of the present invention replaces the double-hole connecting plate used for hanging the insulator with a four-hole connecting plate, and the line arrester is installed on the four-hole connecting plate of the insulator through the connecting rod, which is not limited by terrain, external conditions and other factors, and the installation device is simple , low installation cost and high reliability.

Description of drawings

Fig. 1 is the schematic diagram of the installation device of the ±800 kilovolt DC line lightning arrester of the present invention;

Fig. 2 is a schematic diagram of the installation of the insulator string suspension link plate of the present invention.

Among them: 1 is the wire spacer bar, 2 is the insulator string, 3 is the line arrester body, 4 is the connecting rod, 5 is the insulator string suspension plate, 6 is the installation hole, 7 is the insulating support, 8 is the discharge counter lead wire for the line arrester .

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the ±800 kV DC line lightning arrester installation device of the present invention replaces the insulator suspension connecting plate 5 with a four-hole connecting plate, the line lightning arrester 3 body and the base are insulated by insulating pillars 7, and the lightning arrester base is installed with a connecting rod 4, The other end of the installation connecting rod 4 is installed on the installation hole 6 of the insulator series suspension link plate 5 with bolts, and the high voltage end of the line arrester is installed on the wire spacer bar 1 to realize the installation of the line arrester.

The lead wire 8 of the discharge counter of the line arrester is connected to the connecting rod 4 to realize the record of the operation times of the arrester.

The installation process of the present invention is as follows: firstly, the length of the connecting rod 4 is determined according to the minimum air gap between the line arrester 3 and the insulator string 2 . Perform force calculation on the connecting rod to determine the type of connecting rod that satisfies the hanging force of the line arrester 3 . Then, under the power-off state, the double-hole connecting plate of the suspension insulator is replaced with the four-hole connecting plate 5 . The arrester is hoisted and installed by a crane, the line arrester base is installed on the four-hole connecting plate 5 through the connecting rod 4, and the high-voltage end is installed on the wire spacer bar 1. Finally, the lead wire 8 of the discharge counter of the line arrester is installed on the connecting rod 4 .

The lightning arrester installation device for a ±800 kV DC line according to the present invention is aimed at installing a lightning arrester for ±800 kV DC transmission lines that are prone to lightning strikes, without considering the influence of the terrain, and overcomes the construction period of the ground pillar type installation device for the lightning arrester Long, high installation costs, large safety hazards, and complex terrain that cannot be installed. The device has the advantages of simple structure, low installation cost, high reliability and strong applicability.

The above content is a further detailed description of the specific embodiments of the present invention. It cannot be determined that the specific embodiments of the present invention are limited thereto. For those of ordinary skill in the technical field of the present invention, they can also Making some simple deduction or replacement should be regarded as the patent protection scope of the present invention determined by the submitted claims.

Claims (7)

1. a kind of ± 800 kilovolts of DC line arrester erecting devices, it is characterised in that：Including insulator suspension yoke plate (5), even Extension bar (4), insulation column (7) and lead spacer (1)；

Insulator suspension yoke plate (5) is provided with n mounting hole (6), and n >=3, two of which mounting hole is mutually flat for installing two Capable insulator chain (2), another mounting hole (6) is used to install connecting rod (4)；

The connecting rod (4) is L-shaped hard connecting rod；

Leakage conductor body (3) one end is arranged on base, and base is attached to insulator chain by connecting rod (4) and hangs yoke plate (5)；

Leakage conductor body (3) is provided between one end and base passes through insulation column (7)；

The other end of leakage conductor body (3) is high-pressure side, and high-pressure side is arranged in lead spacer (1)；

Leakage conductor body (3) is parallel with hanging the insulator chain (2) on yoke plate installed in the insulator.

2. ± 800 kilovolts of DC line arrester erecting devices of one kind according to claim 1, it is characterised in that：It is described Insulator suspension yoke plate (5) is four hole yoke plates, which is provided with four mounting holes (6).

3. ± 800 kilovolts of DC line arrester erecting devices of one kind according to claim 2, it is characterised in that：It is described High-pressure side is arranged in lead spacer (1) by bolt.

4. ± 800 kilovolts of DC line arrester erecting devices of one kind according to claim 3, it is characterised in that：It is described Leakage conductor is connected in connecting rod (4) with discharge counter lead (8), realizes the record of leakage conductor action frequency.

5. ± 800 kilovolts of DC line arrester erecting devices of one kind according to claim 4, it is characterised in that：It is described Perforate in connecting rod (4), leakage conductor is installed in connecting rod (4) with discharge counter lead (8) by bolt.

6. a kind of ± 800 kilovolts of DC line arrester installation methods, it is characterised in that：Using any one of Claims 1 to 4 Described one kind ± 800 kilovolt DC line arrester erecting device, installation method is：

Connecting rod is determined according to the requirement of leakage conductor body (3) and the minimum safe the air gap of insulator chain (2) first (4) perpendicular to the length on the side of leakage conductor body；Force Calculation is carried out to connecting rod, it is determined that meeting leakage conductor body (3) the connecting rod type of pendency stress；

Then under power down mode, the diplopore yoke plate of suspension insulator is replaced by four hole yoke plates；Hookup wire is lifted by crane using crane Road lightning arrester body (3), the base of leakage conductor is attached on four hole yoke plates by connecting rod (4), leakage conductor High-pressure side is attached in lead spacer (1)；

Finally leakage conductor is attached in connecting rod (4) with discharge counter lead (8).

7. ± 800 kilovolts of DC line arrester installation methods according to claim 6, it is characterised in that：In the company Perforate on extension bar (4), leakage conductor is installed in connecting rod (4) with discharge counter lead (8) by bolt.