阅读说明：本技术 架空线路用防单相接地式防雷穿刺绝缘子 (Single-phase grounding-proof lightning puncture-proof insulator for overhead line ) 是由 徐凤乾 江伟俊 吴臻 巫水萍 郑志祥 黄云龙 徐雷文 黄炎阶 吕慧珍 梁路 张爱 于 2019-09-06 设计创作，主要内容包括：本发明公开了一种架空线路用防单相接地式防雷穿刺绝缘子,旨在提供一种不仅能够保护设备实现防雷的功能,而且可以有效避免发生单相接地故障的问题的架空线路用防单相接地式防雷穿刺绝缘子。它包括导电安装支架；防雷绝缘子,防雷绝缘子包括导电底座与导电顶座,导电顶座上设有导电引流棒；限流元件,限流元件包括氧化锌避雷器和导电引流环,所述氧化锌避雷器通过绝缘支架安装在导电安装支架上,所述导电引流环安装在氧化锌避雷器的第一端,导电引流环与导电引流棒之间的间隙形成放电间隙；以及防单相接地元件,防单相接地元件包括常闭开关及控制器,所述氧化锌避雷器的下端、常闭开关与导电安装支架串联连接。(The invention discloses a single-phase grounding prevention type lightning protection puncture insulator for an overhead line, and aims to provide the single-phase grounding prevention type lightning protection puncture insulator for the overhead line, which can not only protect equipment to realize a lightning protection function, but also effectively avoid the problem of single-phase grounding faults. It includes a conductive mounting bracket; the lightning protection insulator comprises a conductive base and a conductive top seat, and a conductive drainage rod is arranged on the conductive top seat; the current limiting element comprises a zinc oxide arrester and a conductive current guiding ring, the zinc oxide arrester is installed on the conductive installation support through an insulating support, the conductive current guiding ring is installed at the first end of the zinc oxide arrester, and a discharge gap is formed by a gap between the conductive current guiding ring and the conductive current guiding rod; and the single-phase grounding prevention element comprises a normally closed switch and a controller, and the lower end of the zinc oxide arrester, the normally closed switch and the conductive mounting bracket are connected in series.)

1. A single-phase grounding-proof lightning puncture insulator for an overhead line is characterized by comprising,

a conductive mounting bracket;

the lightning protection insulator comprises a conductive base and a conductive top seat, the conductive base is arranged on the conductive mounting bracket, and a conductive drainage rod is arranged on the conductive top seat;

the current limiting element comprises a zinc oxide arrester and a conductive current guiding ring, the zinc oxide arrester is installed on the conductive installation support through an insulating support, the conductive current guiding ring is installed at the first end of the zinc oxide arrester, the conductive current guiding ring is electrically connected with the first end of the zinc oxide arrester, and a discharge gap is formed by a gap between the conductive current guiding ring and the conductive current guiding rod; and

prevent single-phase ground component, prevent single-phase ground component and include normally closed switch and controller, the lower extreme of zinc oxide arrester, normally closed switch and electrically conductive installing support series connection, the controller is used for detecting the power frequency current that flows through normally closed switch and is used for controlling normally closed switch on/off, when the controller detects that the power frequency current that flows through normally closed switch is greater than the setting value, then control normally closed switch disconnection.

2. The lightning protection single-phase grounding penetration insulator for overhead line of claim 1, wherein the single-phase grounding protection element further comprises an insulating housing having a closed cavity therein, the normally closed switch and the controller being disposed within the closed cavity of the insulating housing.

3. The single-phase ground-proof lightning penetration insulator for an overhead line according to claim 2, wherein the insulating housing is mounted on a lower end of the zinc oxide lightning arrester or an insulating holder.

4. The anti-single-phase grounding lightning protection puncture insulator for the overhead line according to claim 1, 2 or 3, wherein the normally closed switch comprises a fixed contact, a movable contact electrically connected with the fixed contact, and a driving execution device for driving the movable contact to be separated from the fixed contact.

5. The single-phase grounding-proof lightning penetration insulator for the overhead line according to claim 1, 2 or 3, wherein the conductive drainage rod is horizontally arranged, and the conductive drainage ring is positioned below the conductive drainage rod.

6. The lightning protection single-phase grounding-proof penetration insulator for the overhead line according to claim 1, 2 or 3, wherein the single-phase grounding-proof element further comprises a fault indicator lamp, and the fault indicator lamp is turned on when the controller detects that the power frequency current flowing through the normally closed switch is larger than a set value.

7. The lightning protection penetrating insulator of single-phase grounding type for overhead line according to claim 1, 2 or 3, wherein said conductive current guiding ring is mounted on the first end of the zinc oxide lightning arrester by means of a bolt.

8. The lightning protection single-phase grounding penetration insulator for overhead line according to claim 1, 2 or 3, wherein said insulating support is mounted on said conductive mounting support by means of bolts.

Technical Field

The invention relates to a lightning protection puncture insulator, in particular to a single-phase grounding prevention lightning protection puncture insulator for an overhead line.

Background

In recent years, the use of insulated conductors has led to a reduction in the lightning resistance of the lines. In order to solve the problem, a lightning protection pin insulator with a lightning arrester and without stripping an insulating layer is invented and widely applied, and has double functions of the pin insulator and the lightning arrester. The current lightning protection pin insulator generally comprises a conductive base arranged at the lower end of the insulator, and a drainage rod 1.5 arranged at the upper end of the insulator and electrically connected with the conductive upper seat, wherein one end of the drainage rod is electrically connected with the conductive upper seat, a discharge gap is formed between the other end of the drainage rod and the conductive base, when an insulated wire is struck by lightning, the discharge gap between the drainage rod and the conductive base is punctured to form a current channel, lightning current is released to the ground, and the lightning protection function of the protection device is realized. For example, chinese patent publication No. CN202230809U, published 2012 and 5-23, entitled multifunctional lightning protection pin insulator.

The existing lightning protection pin insulator can prevent single-phase earth faults under the common condition due to the isolation effect of the discharge gap; however, in special cases, such as wet weather and rainy or snowy weather, a problem of single-phase ground fault occurs because the gap of the discharge gap is generally small.

Disclosure of Invention

The invention aims to provide a single-phase grounding prevention type lightning protection puncture insulator for an overhead line, which can not only protect equipment to realize a lightning protection function, but also effectively avoid the problem of single-phase grounding fault.

The technical scheme of the invention is as follows:

a single-phase grounding prevention type lightning puncture insulator for an overhead line comprises a conductive mounting bracket; the lightning protection insulator comprises a conductive base and a conductive top seat, the conductive base is arranged on the conductive mounting bracket, and a conductive drainage rod is arranged on the conductive top seat; the current limiting element comprises a zinc oxide arrester and a conductive current guiding ring, the zinc oxide arrester is installed on the conductive installation support through an insulating support, the conductive current guiding ring is installed at the first end of the zinc oxide arrester, the conductive current guiding ring is electrically connected with the first end of the zinc oxide arrester, and a discharge gap is formed by a gap between the conductive current guiding ring and the conductive current guiding rod; and the single-phase grounding prevention element comprises a normally closed switch and a controller, the lower end of the zinc oxide arrester, the normally closed switch and the conductive mounting bracket are connected in series, the controller is used for detecting the power frequency current flowing through the normally closed switch and controlling the normally closed switch to be on/off, and when the controller detects that the power frequency current flowing through the normally closed switch is greater than a set value, the normally closed switch is controlled to be off.

When lightning overvoltage occurs, a discharge gap between the conductive drainage rod and the conductive drainage ring is broken down to form a current channel, and the lightning current is released to the ground through the zinc oxide lightning arrester, the normally closed switch and the conductive mounting bracket; and then after the lightning current is released to the ground, if continuous power frequency current is guided to the conductive current guiding ring through a gap channel formed by the lightning current, the power frequency current is absorbed by the zinc oxide arrester, so that the effect of protecting the circuit is achieved, the circuit is prevented from breaking or tripping accidents caused by lightning stroke, and the running reliability of the circuit is improved. On the other hand, in some special conditions, such as wet weather and rainy and snowy weather, if a power frequency current is guided to the conductive current guiding ring through the discharge gap, the power frequency current will be absorbed by the zinc oxide arrester, so as to avoid the problem of single-phase ground fault.

More importantly, if the zinc oxide arrester fails, when power frequency current flows through the normally closed switch through the zinc oxide arrester, if the power frequency current flowing through the normally closed switch is larger than a set value, the normally closed switch is controlled to be switched off, and therefore single-phase grounding faults cannot occur.

Preferably, the single-phase grounding prevention element further comprises an insulating shell, a closed inner cavity is formed in the insulating shell, and the normally closed switch and the controller are arranged in the closed inner cavity of the insulating shell. So, can avoid under moist weather and the sleet weather, rainwater and moisture get into insulating casing's airtight inner chamber, after the disconnection of control normally closed switch, can guarantee the circuit disconnection to ensure can not take place single-phase grounded's trouble.

Preferably, the insulating housing is mounted on the lower end of the zinc oxide arrester or on the insulating support.

Preferably, the normally closed switch comprises a fixed contact, a moving contact electrically connected with the fixed contact, and a driving execution device for driving the moving contact to be separated from the fixed contact.

Preferably, the conductive drainage rod is horizontally arranged, and the conductive drainage ring is positioned below the conductive drainage rod.

Preferably, the single-phase grounding prevention element further comprises a fault indicator lamp, and the fault indicator lamp is turned on when the controller detects that the power frequency current flowing through the normally closed switch is larger than a set value. As the single-phase grounding prevention type lightning protection puncture insulator for the overhead line is generally arranged at the top of a tower and is far away from the ground, once a fault occurs, the insulator is difficult to see by naked eyes and a fault point is difficult to find; therefore, this scheme setting is at the fault indicator lamp, and when the controller detected the power frequency electric current that flows through normally closed switch and is greater than the setting value, the fault indicator lamp was lighted to make things convenient for the line patrol workman in time to discover and handle the fault point.

Preferably, the electrically conductive shunt ring is mounted to the first end of the zinc oxide arrester by means of a bolt.

Preferably, the insulating support is mounted on the conductive mounting support by bolts.

The invention has the beneficial effects that: when lightning overvoltage occurs, a discharge gap between the conductive drainage rod and the conductive drainage ring is broken down to form a current channel, and the lightning current is released to the ground through the zinc oxide lightning arrester, the normally closed switch and the conductive mounting bracket; and then after the lightning current is released to the ground, if continuous power frequency current is guided to the conductive current guiding ring through a gap channel formed by the lightning current, the power frequency current is absorbed by the zinc oxide arrester, so that the effect of protecting the circuit is achieved, the circuit is prevented from breaking or tripping accidents caused by lightning stroke, and the running reliability of the circuit is improved. On the other hand, in some special conditions, such as wet weather and rainy and snowy weather, if a power frequency current is guided to the conductive current guiding ring through the discharge gap, the power frequency current will be absorbed by the zinc oxide arrester, so as to avoid the problem of single-phase ground fault. More importantly, if the zinc oxide arrester fails, when power frequency current flows through the normally closed switch through the zinc oxide arrester, if the power frequency current flowing through the normally closed switch is larger than a set value, the normally closed switch is controlled to be switched off, and therefore single-phase grounding faults cannot occur.

Drawings

Fig. 1 is a schematic structural view of a single-phase grounding-proof lightning penetration insulator for an overhead line according to the present invention.

Fig. 2 is a schematic structural diagram of the single-phase grounding prevention element of the present invention.

In the figure:

a conductive mounting bracket 1;

the lightning protection insulator 2, the insulator main body 2.1, the conductive base 2.2, the conductive top seat 2.3, the conductive drainage rod 2.4 and the piercing wire clamp 2.5;

a current limiting element 3 and a zinc oxide arrester 3.1. A conductive current guiding ring 3.2;

a discharge gap 4;

an insulating support 5;

the device comprises a single-phase grounding prevention element 6, a controller 6.1, a normally closed switch 6.2, a fixed contact 6.21, a moving contact 6.22, a driving execution device 6.23, an insulating shell 6.3 and a conducting strip 6.4;

the wires 7 are connected.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly explained and illustrated below with reference to the accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present scheme, and are not construed as limiting the scheme of the present invention.

These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited thereby. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.

In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., and "several" means one or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections, either mechanical or electrical, or communicating with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.