WO2022036881A1

WO2022036881A1 - Distribution network line lightning arrester

Info

Publication number: WO2022036881A1
Application number: PCT/CN2020/127950
Authority: WO
Inventors: 钟建业; 黎阳羊; 范伟波; 俞发强; 邓寒; 陈镜巨; 李小婷
Original assignee: 广东电网有限责任公司清远供电局
Priority date: 2020-08-21
Filing date: 2020-11-11
Publication date: 2022-02-24
Also published as: CN112018737A; CN112018737B

Abstract

A distribution network line lightning arrester, comprising: a lightning arrester housing, zinc oxide lightning arrester pieces, an upper plug, a lower plug, a push rod, a pressure spring, and a separation mechanism. Multiple zinc oxide lightning arrester pieces are successively connected and mounted in the lightning arrester housing; the upper plug is mounted in an upper opening of the lightning arrester housing, and the upper plug has one end electrically connected to the zinc oxide lightning arrester pieces and the other end electrically connected to a contact piece at the top of a lightning arrester base; the lower plug is provided with a through hole and mounted in a lower opening of the lightning arrester housing; a movable end of the push rod is slidably connected to the through hole; the pressure spring pushes a working end to abut against the zinc oxide lightning arrester pieces; the separation mechanism is mounted on the lower plug, and when the zinc oxide lightning arrester pieces are subjected to thermal explosion, the separation mechanism drives the movable end to move towards the lower plug, such that the separation mechanism is removed from the through hole to separate from the movable end.

Description

Distribution network line arrester

This application claims the priority of the Chinese patent application with an application date of August 21, 2020 and an application number of 202010852188.8, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of lightning arresters, for example, to a lightning arrester for distribution network lines.

Background technique

Line zinc oxide arresters are mainly divided into two types: traditional zinc oxide arresters and thermal explosion arresters. Traditional zinc oxide arresters do not have a breakaway mechanism. When the arrester bursts, the main body of zinc oxide is broken down, and the internal metal material melts, resulting in line grounding faults , the power cannot be restored quickly. The thermal explosion arrester is equipped with a thermal explosion disconnector at the bottom of the traditional zinc oxide arrester, which is filled with hot melt material. When a lightning overcurrent occurs, the thermal explosion disconnector explodes, and the bottom spring device is used to change the base. direction, and then fall from the arrester strut. The threshold value of its internal hot-melt material needs to be lower than the overcurrent capability of the zinc oxide arrester, which is easy to cause the arrester to frequently act and burst, which increases the burden of maintenance and replacement, and the hot-melt material is connected in series with the zinc oxide arrester. The molten material belongs to the next level. Because the hot-melt material is affected by many factors such as processing technology, temperature, humidity, and current duration, the extremely poor fit between the hot-melt material and the zinc oxide is prone to refusal to move.

SUMMARY OF THE INVENTION

The present application provides a lightning arrester for a distribution network line. When a high-voltage current flows into the lightning arrester for a distribution network line, it can be instantly disconnected from the power grid system, thereby reducing the time of line blackout and improving the reliability of electricity consumption.

An embodiment provides a lightning arrester for a distribution network, including:

The arrester shell is hollow inside and open at both ends;

A plurality of zinc oxide arrester sheets are provided, and the plurality of zinc oxide arrester sheets are connected in sequence, installed in the arrester shell, and arranged axially along the arrester shell;

An upper plug, one end of the upper plug extends into and blocks the upper end opening of the arrester shell, and is electrically connected with the zinc oxide arrester sheet, and the other end of the upper plug is electrically connected to the contact sheet at the top of the arrester base connect;

The lower plug extends into and blocks the lower end opening of the arrester housing, and the lower plug is provided with a through hole along the axial direction;

The ejector rod is provided with a movable end and a working end fixedly connected to the top of the movable end, and the movable end is slidably connected in the through hole;

a pressure spring, sandwiched between the working end and the lower plug, pressing the working end to abut against the zinc oxide arrester sheet; and

The separation mechanism is installed on the lower plug. In the initial state, the separation mechanism is electrically connected with the contact piece at the bottom of the arrester base, and the separation mechanism is engaged with the movable end and is synchronized with the movable end When sliding axially in the through hole, when the zinc oxide arrester sheet thermally bursts, the movable end is driven to move toward the lower plug, so that the separation mechanism is released from the through hole and is connected with the Active end separation.

Optionally, the separation mechanism includes:

a lower bracket, fixedly mounted on the lower plug;

a pin, which can be engaged with the movable end, and the movable end can drive the pin to slide axially in the through hole;

a connecting rod, one end of which is rotatably connected to the pin;

A lower base, one end is rotatably connected to the lower bracket, and the other end is rotatably connected to the other end of the connecting rod, the lower base is provided with a first contact portion, and the first contact portion is in contact with the bottom of the arrester base sheet electrical connection; and

A torsion spring is installed at the rotational connection between the lower bracket and the lower base, one end of the torsion spring is abutted against the lower bracket, and the other end is abutted against the lower base. After being released from the through hole, the torsion spring drives the lower bracket and the lower base to be relatively away from each other.

Optionally, the upper plug includes a top plug and a top contact that are connected to each other, the top plug is installed at an opening at one end of the arrester housing, and the end is provided with a conductive contact, the conductive contact. It is electrically connected to the zinc oxide arrester sheet; the end of the top contact is provided with a second contact portion, and the second contact portion is electrically connected to the top contact sheet of the arrester base.

Optionally, a horizontal shaft is provided on the lower base, the horizontal shaft is rotatably mounted on the arrester base, and the second contact portion and the first contact portion are respectively connected from the top contact piece and the arrester base. When the contact piece at the bottom of the arrester base comes out, the lower base is suspended on the arrester base through the horizontal shaft.

Optionally, a pull ring is provided on the top contact.

Optionally, the lower base is provided with an operation hole.

Optionally, the lower plug is provided with a plurality of threaded holes, the lower bracket is provided with a plurality of through holes, and the fasteners pass through the through holes and are screwed with the threaded holes to connect the lower support. plug and the lower bracket.

Optionally, the top rod includes a support rod and a support head, the support head is used as the working end, one end of the support rod is fixed to the support head, and the other end is clamped to the support head as the movable end. the pin, the pressure spring is sleeved on the outside of the support rod.

Optionally, the length of the support rod is adjustable.

Optionally, the material of the arrester shell is epoxy resin.

In the application without changing the main body of zinc oxide, when high-voltage current flows into the arrester of the distribution network, the zinc oxide of the arrester of the distribution network bursts due to overcurrent, and the energy generated when the zinc oxide bursts overcurrent is used to make the distribution network burst. The line arrester is instantly separated from the arrester base, and then quickly separated from the grid system, so that the grid does not trip or can be successfully reclosed after tripping, reducing the time of line blackout and improving the reliability of electricity consumption.

Description of drawings

Fig. 1 is the dismantling schematic diagram of a kind of distribution network line arrester structure described in the embodiment of the present application;

2 is a schematic structural diagram of a distribution network line arrester in an initial state according to an embodiment of the present application;

3 is a schematic structural diagram of a lightning arrester for a distribution network according to an embodiment of the present application when a zinc oxide arrester sheet thermally bursts.

In the picture:

1. Arrester shell; 2. Zinc oxide arrester sheet; 3. Upper plug; 31. Top plug; 32. Top contact; 321. Second contact part; 322. Pull ring; 4. Lower plug; 5. ejector rod; 6. pressure spring;

7. Separation mechanism; 71, lower bracket; 72, pin; 73, connecting rod; 74, lower base; 741, first contact part; 742, operating hole; 743, horizontal shaft; 75, torsion spring.

detailed description

In the description of this application, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, or a detachable connection, or a mechanical connection. The connection can also be an electrical connection, it can be a direct connection, or an indirect connection through an intermediate medium, and it can be an internal connection between two elements or an interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In the description of this application, unless otherwise expressly specified and limited, the first feature "on" or "under" the second feature may include the first feature and the second feature in direct contact, or may include the first feature and the second feature is not in direct contact but through another feature between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature is directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

Example 1

As shown in Figures 1 to 3, the present application provides a lightning arrester for a distribution network line, comprising a lightning arrester shell 1, a zinc oxide arrester sheet 2, an upper plug 3, a lower plug 4, a push rod 5, a pressure spring 6 and a separation Mechanism 7, the arrester housing 1 is hollow inside and both ends are open; a plurality of zinc oxide arrester sheets 2 are provided, and the plurality of zinc oxide arrester sheets 2 are connected in sequence, installed in the arrester housing 1, and arranged axially along the arrester housing 1; One end of the head 3 extends into and blocks the upper end opening of the arrester shell 1, and is electrically connected to the zinc oxide arrester sheet 2, and the other end of the upper plug 3 is electrically connected to the contact piece at the top of the arrester base; the lower plug 4 extends into and seals. The lower end opening of the arrester housing 1 is blocked, and the lower plug 4 is provided with a through hole in the axial direction; the ejector rod 5 is provided with a movable end and a working end fixedly connected to the top of the movable end, and the movable end is slidably connected in the through hole; the pressure spring 6 It is sandwiched between the working end and the lower plug 4, and the working end is pressed against the zinc oxide arrester sheet 2; the separation mechanism 7 is installed on the lower plug 4. In the initial state, the separation mechanism 7 is in contact with the bottom of the arrester base. It is electrically connected, and the separation mechanism 7 is engaged with the movable end, and slides axially in the through hole synchronously with the movable end. When the zinc oxide arrester sheet 2 thermally bursts, the movable end is driven to move toward the lower plug 4, so that the separation mechanism 7 moves from the through hole to the lower plug 4. out of the hole and separated from the active end.

In this embodiment, the arrester of the distribution network is installed on the existing arrester base. In the initial state, the upper plug 3 is electrically connected with the contact piece at the top of the existing arrester base, and the separation mechanism 7 is connected with the contact piece at the bottom of the existing arrester base. Electrical connection, the ejector rod 5 is pressed against the zinc oxide arrester sheet 2 under the action of the pressure spring 6, the separation mechanism 7 is engaged with the movable end, the contact pieces on the top and bottom of the arrester base and the upper plug 3, the zinc oxide arrester sheet 2, The ejector rod 5 and the separation mechanism 7 form an electrical circuit. When the high-voltage current flows into the arrester of the distribution network, the zinc oxide arrester sheet 2 bursts and expands rapidly due to the overcurrent. At this time, the ejector rod 5 will overcome the pressure spring 6 and move downwards. The end pushes the separation mechanism 7 to move down in the through hole, and then the separation mechanism 7 comes out of the through hole and separates from the movable end, resulting in loosening between the contact piece on the top of the arrester base and the upper plug 3, so that the arrester of the distribution network line is detached Quickly disconnect from the grid system.

Optionally, the separation mechanism 7 includes a lower bracket 71, a pin 72, a connecting rod 73, a lower base 74 and a torsion spring 75, and the lower bracket 71 is fixedly mounted on the lower plug 4; the pin 72 can be engaged with the movable end, and the movable end can The pin 72 is driven to slide axially in the through hole; one end of the connecting rod 73 is rotatably connected to the pin 72; A contact portion 741, the first contact portion 741 is electrically connected to the contact piece at the bottom of the arrester base; the torsion spring 75 is installed at the rotational connection between the lower bracket 71 and the lower base 74, one end of the torsion spring 75 abuts against the lower bracket 71, and the other end Abutting against the lower base 74 , after the pin 72 is released from the through hole, the torsion spring 75 drives the lower bracket 71 and the lower base 74 to move away from each other. When the zinc oxide arrester sheet 2 is thermally burst, it expands rapidly, and drives the movable end and the pin 72 to slide axially in the through hole. When the movable end approaches the critical position at the bottom of the lower plug 4, the radial pressure of the pin 72 disappears instantly, and the pin 72 The lower bracket 71 and the lower base 74 are quickly separated from the through hole under the elastic force of the torsion spring 75, and the first contact portion 741 is released from the contact piece at the bottom of the arrester base, so that the upper plug that is clamped on the contact piece at the top of the arrester base 3. Looseness is generated so that the arrester of the distribution network line is separated from the arrester base.

Optionally, the upper plug 3 includes a top plug 31 and a top contact 32 that are connected to each other. The top plug 31 is made of aluminum alloy and is installed at the opening of one end of the arrester housing 1, and the end is provided with a conductive contact, The conductive contact is electrically connected to the zinc oxide arrester sheet 2; the top contact 32 is made of brass, and the end is provided with a second contact portion 321, which is snapped and electrically connected to the top contact sheet of the existing arrester base .

Exemplarily, the lower base 74 is provided with a horizontal shaft 743, and the horizontal shaft 743 is rotatably mounted on the arrester base. After the zinc oxide arrester sheet 2 is thermally burst, the second contact portion 321 and the first contact portion 741 are respectively contacted from the top of the arrester base. The sheet and the bottom contact sheet of the arrester base come out, and the lower base 74 can be suspended on the base of the arrester through the horizontal shaft 743, so as to avoid the lightning arrester of the distribution network from hurting people.

Exemplarily, the top contact 32 is provided with a pull ring 322 , and the insulating operating rod installs the top contact 32 on the arrester base through the pull ring 322 .

Optionally, the lower base 74 is provided with an operation hole 742 , and the insulating operation rod passes through the operation hole 742 to install the lower base 74 on the arrester base.

Exemplarily, the lower plug 4 is provided with a plurality of threaded holes, the lower bracket 71 is provided with a plurality of through holes, the fasteners pass through the through holes and are screwed with the threaded holes to connect the lower plug 4 and the lower bracket 71, In this embodiment, the fasteners are screws.

Optionally, the top rod 5 includes a support rod and a support head, the support head is used as a working end, one end of the support rod is fixed to the support head, the other end is clamped to the pin 72 as a movable end, and the pressure spring 6 is sleeved on the outside of the support rod. .

Optionally, the arrester housing 1 is made of epoxy resin, which has good insulation and mechanical strength, and provides protection and support for the whole of the arrester of the distribution network.

Embodiment 2

This embodiment provides a lightning arrester for a distribution network, which is further improved on the basis of the first embodiment. Under different operating environments, the high-voltage current carried by the arrester is different. The support of the arrester for the distribution network in this embodiment is The length of the rod is adjustable, and the length of the support rod can be adjusted according to the actual operating conditions, and the number of zinc oxide arrester sheets 2 in the arrester shell 1 can be appropriately increased or decreased, so that the distribution network line arrester has the ability to withstand high voltage currents of different ranges. ability.

Optionally, the support rod is a conventional telescopic rod in the field, and its specific structure will not be repeated here.

Claims

A lightning arrester for a distribution network line, comprising:

The arrester housing (1) is hollow inside and open at both ends;

A plurality of zinc oxide arrester sheets (2) are provided, the plurality of zinc oxide arrester sheets (2) are connected in sequence, installed in the arrester housing (1), and arranged axially along the arrester housing (1);

An upper plug (3), one end of the upper plug (3) extends into and blocks the upper end opening of the arrester shell (1), and is electrically connected with the zinc oxide arrester sheet (2), the upper The other end of the plug (3) is electrically connected with the contact piece on the top of the arrester base;

A lower plug (4) extends into and blocks the opening of the lower end of the arrester housing (1), and the lower plug (4) is provided with a through hole along the axial direction;

A top rod (5) is provided with a movable end and a working end fixedly connected to the top of the movable end, and the movable end is slidably connected in the through hole;

a pressure spring (6), sandwiched between the working end and the lower plug (4), pressing the working end to abut against the zinc oxide arrester sheet (2); and

A separation mechanism (7) is installed on the lower plug (4). In the initial state, the separation mechanism (7) is electrically connected with the contact piece at the bottom of the arrester base, and the separation mechanism (7) is engaged with The movable end slides axially in the through hole synchronously with the movable end, and when the zinc oxide arrester sheet (2) thermally bursts, the movable end is driven to move toward the lower plug (4) , so that the separation mechanism (7) is released from the through hole and separated from the movable end.
The distribution network line arrester according to claim 1, wherein the separation mechanism (7) comprises:

a lower bracket (71), fixedly mounted on the lower plug (4);

a pin (72), which can be engaged with the movable end, and the movable end can drive the pin (72) to slide axially in the through hole;

a connecting rod (73), one end of which is rotatably connected to the pin (72);

The lower base (74) has one end rotatably connected to the lower bracket (71) and the other end rotatably connected to the other end of the connecting rod (73). The lower base is provided with a first contact portion (741), so The first contact portion (741) is electrically connected to the contact piece at the bottom of the arrester base; and

A torsion spring (75) is installed at the rotational connection between the lower bracket (71) and the lower base (74). One end of the torsion spring (75) abuts against the lower bracket (71), and the other end Abutting against the lower base (74), after the pin (72) comes out of the through hole, the torsion spring (75) drives the lower bracket (71) and the lower base (74) relatively far away.
The arrester for distribution network lines according to claim 2, wherein the upper plug (3) comprises a top plug (31) and a top contact (32) which are connected to each other, and the top plug (31) is installed on the At the upper end opening of the arrester housing (1), conductive contacts are arranged at the ends, and the conductive contacts are electrically connected with the zinc oxide arrester sheet (2); the top contacts (32) are provided with A second contact portion (321), the second contact portion (321) is electrically connected to the contact piece on the top of the arrester base.
The distribution network line arrester according to claim 3, wherein a horizontal shaft (743) is provided on the lower base (74), and the horizontal shaft (743) is rotatably mounted on the arrester base, and the second When the contact portion (321) and the first contact portion (741) are respectively separated from the contact piece at the top of the arrester base and the contact piece at the bottom of the arrester base, the lower base (74) passes through the horizontal shaft (743) It is suspended on the base of the arrester.
The lightning arrester for distribution network lines according to claim 1, wherein a pull ring (322) is provided on the top contact (32).
The lightning arrester for distribution network lines according to claim 2, wherein an operation hole (742) is provided on the lower base (74).
The arrester for distribution network lines according to claim 2, wherein the lower plug (4) is provided with a plurality of threaded holes, the lower bracket (71) is provided with a plurality of through holes, and the fasteners pass through The through hole is screwed with the threaded hole to connect the lower plug (4) and the lower bracket (71).
The arrester for distribution network lines according to claim 2, wherein the top rod (5) comprises a support rod and a support head, the support head serves as the working end, and one end of the support rod is fixed to the support The other end is clamped to the pin (72) as the movable end, and the pressure spring (6) is sleeved on the outside of the support rod.
The lightning arrester of the distribution network according to claim 8, wherein the length of the support rod is adjustable.
The lightning arrester for distribution network lines according to any one of claims 1-9, wherein the material of the arrester housing (1) is epoxy resin.