CN201348907Y - Lightning protector of 10kV line - Google Patents
Lightning protector of 10kV line Download PDFInfo
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- CN201348907Y CN201348907Y CNU2009201427742U CN200920142774U CN201348907Y CN 201348907 Y CN201348907 Y CN 201348907Y CN U2009201427742 U CNU2009201427742 U CN U2009201427742U CN 200920142774 U CN200920142774 U CN 200920142774U CN 201348907 Y CN201348907 Y CN 201348907Y
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Abstract
本实用新型公开了一种10kV线路防雷器,涉及一种防雷保护设备。包括相互连接的绝缘子和导线,设置有引弧电极、氧化锌避雷器和支撑横担,引弧电极固定于氧化锌避雷器高压端,在导线与氧化锌避雷器之间形成一个放电间隙,提供雷击闪络通道,氧化锌避雷器低压端固定于支撑横担的右端,防止雷电过电压和截断工频续流,支撑横担的左端固定在绝缘子下端的钢脚上。本实用新型适用于10kV架空配电线路防雷击断线与跳闸,具有实用性和经济性。
The utility model discloses a 10kV line lightning protector, which relates to lightning protection equipment. It consists of interconnected insulators and wires, and is equipped with arc-starting electrodes, zinc oxide arresters and supporting crossarms. The arc-starting electrodes are fixed on the high-voltage end of the zinc oxide arrester, forming a discharge gap between the wires and the zinc oxide arrester to provide lightning flashover The channel, the low-voltage end of the zinc oxide arrester is fixed on the right end of the supporting cross-arm to prevent lightning overvoltage and cut off the continuous flow of power frequency, and the left end of the supporting cross-arm is fixed on the steel foot at the lower end of the insulator. The utility model is suitable for preventing lightning breakage and tripping of 10kV overhead power distribution lines, and has practicability and economy.
Description
技术领域: Technical field:
本实用新型涉及一种防雷保护设备,尤其涉及一种10kV线路防雷器,具体地说,涉及一种10kV架空配电线路防止雷击断线和跳闸的避雷器。The utility model relates to a lightning protection device, in particular to a 10kV line lightning protector, in particular to a lightning arrester for preventing lightning breakage and tripping of a 10kV overhead power distribution line.
背景技术: Background technique:
10kV配电线路的绝缘水平低,易发生雷击闪络,进而形成工频电弧烧断导线。架空配电线路采用绝缘导线,与电缆相比,绝缘导线投资省、建设快,优点十分明显;但是雷击断线问题突出,全国已出现多次绝缘导线雷击断线事故。根据现场运行情况,10kV裸导线也出现了较高频率的雷击断线事故或者雷击跳闸事故,甚至35kV裸导线也发生过雷击断线事故。造成断线的主要原因是在雷击闪络通道上建弧形成工频续流,弧根的温度很高,能够在短时间内将导线烧断,即使是裸导线,如果通过的电流很大,也能够将导线烧断。The insulation level of 10kV distribution lines is low, and lightning flashovers are prone to occur, and then power frequency arcs are formed to burn the wires. Overhead distribution lines use insulated conductors, which have obvious advantages compared with cables, with less investment and quicker construction. However, the problem of lightning disconnection is serious, and there have been many lightning disconnection accidents of insulated conductors across the country. According to the on-site operation, 10kV bare conductors also have relatively high-frequency lightning strike disconnection accidents or lightning tripping accidents, and even 35kV bare conductors have also experienced lightning strike disconnection accidents. The main reason for disconnection is that the arc is built on the lightning flashover channel to form a power frequency continuous current. The temperature of the arc root is very high, and the wire can be blown in a short time. Even if it is a bare wire, if the current passing through it is large, It is also possible to blow the wire.
目前采用的防雷措施有安装架空地线、穿刺性防弧金具、防雷支柱绝缘子和氧化锌避雷器等,但是根据现场实践的反馈,存在着各种各样的问题,需要改进。The current lightning protection measures include installation of overhead ground wires, piercing anti-arc fittings, lightning protection post insulators and zinc oxide arresters, etc. However, according to feedback from field practice, there are various problems that need to be improved.
实用新型内容: Utility model content:
为克服现有技术的缺陷,本实用新型的目的在于提供一种比较适宜的防雷措施,即提供一种10kV线路防雷器,能够在有效防止雷击断线事故的同时,降低线路的雷击跳闸率,提高供电的可靠性。In order to overcome the defects of the prior art, the purpose of this utility model is to provide a relatively suitable lightning protection measure, that is, to provide a 10kV line lightning protector, which can effectively prevent lightning strikes and disconnection accidents, and at the same time reduce the lightning tripping of the line. rate and improve the reliability of power supply.
本实用新型解决技术问题采用如下技术方案:The utility model solves the technical problem and adopts the following technical solutions:
一种10kV线路防雷器,包括相互连接的绝缘子和导线,设置有引弧电极、氧化锌避雷器和支撑横担;引弧电极固定于氧化锌避雷器高压端,在导线与氧化锌避雷器之间形成一个放电间隙;氧化锌避雷器低压端固定于支撑横担的右端;支撑横担的左端固定在绝缘子下端的钢脚上。A 10kV line lightning arrester, including interconnected insulators and wires, is provided with an arc-starting electrode, a zinc oxide arrester and a supporting cross-arm; the arc-starting electrode is fixed at the high-voltage end of the zinc oxide arrester, and forms a A discharge gap; the low-voltage end of the zinc oxide arrester is fixed on the right end of the supporting cross-arm; the left end of the supporting cross-arm is fixed on the steel foot at the lower end of the insulator.
所述引弧电极是一种从上到下包括引弧面和固定螺孔的U形金属结构体。The arc starting electrode is a U-shaped metal structure including an arc starting surface and a fixing screw hole from top to bottom.
氧化锌避雷器包括从上到下依次连接的高压端螺杆、固定螺母、压紧螺母、复合外套、多个串联的氧化锌阀片、下复合外套、下压紧螺母、下固定螺母和低压端螺杆。The zinc oxide surge arrester consists of a high-voltage end screw, a fixed nut, a compression nut, a composite casing, a plurality of series-connected zinc oxide valve plates, a lower composite casing, a lower compression nut, a lower fixed nut, and a low-pressure end screw connected in sequence from top to bottom. .
支撑横担是一种折弯的金属支撑片,左端设置有与绝缘子下端钢脚连接的开放性螺孔,右端设置有与避雷器低压端螺杆连接的封闭性螺孔。The supporting cross arm is a kind of bent metal support sheet, the left end is provided with an open screw hole connected with the steel foot at the lower end of the insulator, and the right end is provided with a closed screw hole connected with the low-voltage end screw of the arrester.
与已有技术相比,本实用新型的有益效果体现在:Compared with the prior art, the beneficial effects of the utility model are reflected in:
1、本实用新型包括引弧电极、氧化锌避雷器和支撑横担等。其特殊之处在于通过引弧电极在导线与避雷器之间形成一个空气间隙,避雷器低压端自然接地,不需要增加额外的接地电阻,减少施工强度同时能够有效地解决导线雷击断线问题。1. The utility model includes arc starting electrodes, zinc oxide lightning arresters and supporting cross-arms, etc. Its special feature is that an air gap is formed between the wire and the arrester through the arcing electrode, and the low-voltage end of the arrester is naturally grounded, without adding additional grounding resistance, reducing construction intensity and effectively solving the problem of wire disconnection caused by lightning strikes.
2、引弧电极安装在氧化锌避雷器高压端,在导线与氧化锌避雷器形成一个空气间隙,电极设计为圆弧状,即使在导线摆动的情况下也能够使导线与引弧电极之间的间隙不会发生太大的变化,保证放电的稳定性;串联的空气间隙使避雷器平时不受工频电压、操作过电压等的作用,增长避雷器的使用寿命;在雷电过电压作用下,避雷器能够有效动作,限制雷电过电压的幅值并截断工频续流,防止发生绝缘子闪络事故;通过支撑横担将避雷器并联安装在绝缘子侧面,合理设计支撑横担使避雷器与导线形成适当的串联间隙,能够通过串联间隙形成有效放电通道,保证氧化锌避雷器能够躲过操作过电压又能够在雷电过电压下有效动作。2. The arc starting electrode is installed at the high voltage end of the zinc oxide arrester, and an air gap is formed between the wire and the zinc oxide arrester. There will not be too much change to ensure the stability of the discharge; the air gap in series makes the arrester not affected by power frequency voltage and operating overvoltage at ordinary times, which increases the service life of the arrester; under the action of lightning overvoltage, the arrester can effectively Action to limit the amplitude of lightning overvoltage and cut off power frequency continuous flow to prevent insulator flashover accidents; install the arrester in parallel on the side of the insulator through the support cross arm, and reasonably design the support cross arm to form an appropriate series gap between the arrester and the wire. An effective discharge channel can be formed through the series gap, ensuring that the zinc oxide arrester can escape the operating overvoltage and operate effectively under the lightning overvoltage.
据上所述,当10kV架空配电线路受到雷击时,能够击穿引弧电极提供的放电间隙,使氧化锌避雷器动作,将雷电过电压限制在绝缘子的闪络电压之下,然后通过氧化锌避雷器将工频续流截断,能够防止由雷击闪络而引起的跳闸和导线断线事故。According to the above, when the 10kV overhead distribution line is struck by lightning, it can break through the discharge gap provided by the arc-triggering electrode, make the zinc oxide arrester operate, limit the lightning overvoltage below the flashover voltage of the insulator, and then pass through the zinc oxide The surge arrester cuts off the power frequency freewheeling, which can prevent tripping and wire disconnection accidents caused by lightning flashover.
本实用新型还具有以下积极效果:The utility model also has the following positive effects:
1、满足国标规定的氧化锌避雷器和金具的性能要求,放电残压远小于绝缘子的闪络电压。1. It meets the performance requirements of zinc oxide arresters and fittings stipulated in the national standard, and the discharge residual voltage is much lower than the flashover voltage of insulators.
2、氧化锌避雷器外套由合成外套硅橡胶制作,具有良好的绝缘性能和防污性能。2. The jacket of zinc oxide arrester is made of synthetic jacket silicone rubber, which has good insulation performance and antifouling performance.
3、设计简洁,施工安装方便,采用纯空气间隙,系统不承受系统电压,氧化锌避雷器使用寿命长。3. The design is simple, the construction and installation are convenient, the pure air gap is used, the system does not bear the system voltage, and the zinc oxide arrester has a long service life.
4、具有良好的动作特性,引弧电极能够提供多次工频电弧的烧蚀,性能可靠。4. With good action characteristics, the arc starting electrode can provide multiple power frequency arc ablation, and the performance is reliable.
5、适用于10kV架空配电线路,包括绝缘线路和裸导线线路防止雷击跳闸和断线事故。5. It is suitable for 10kV overhead distribution lines, including insulated lines and bare wire lines to prevent lightning tripping and disconnection accidents.
附图说明: Description of drawings:
图1是本实用新型的结构示意图。Fig. 1 is the structural representation of the utility model.
图2是引弧电极的结构示意图。Fig. 2 is a schematic diagram of the structure of the arc starting electrode.
图3是氧化锌避雷器的结构示意图。Fig. 3 is a structural schematic diagram of a zinc oxide arrester.
图4是支撑横担的结构俯视图。Fig. 4 is a top view of the structure supporting the cross arm.
图中标号:1引弧电极,1.1引弧面,1.2固定螺孔,2氧化锌避雷器,2.1高压端螺杆,2.2固定螺母,2.3压紧螺母,2.4复合外套,2.5氧化锌阀片,2.6低压端螺杆,2.7下复合外套,2.8下压紧螺母,2.9下固定螺母,3支撑横担,3.1开放性螺孔,3.2封闭性螺孔,4绝缘子,5导线。Labels in the figure: 1 arc striking electrode, 1.1 arc striking surface, 1.2 fixing screw hole, 2 zinc oxide arrester, 2.1 high voltage end screw, 2.2 fixing nut, 2.3 compression nut, 2.4 composite casing, 2.5 zinc oxide valve plate, 2.6 low voltage End screw, 2.7 lower compound jacket, 2.8 lower compression nut, 2.9 lower fixed nut, 3 support cross arms, 3.1 open screw holes, 3.2 closed screw holes, 4 insulators, 5 wires.
以下通过具体实施方式,并结合附图对本实用新型作进一步说明。The utility model will be further described below through specific embodiments in conjunction with the accompanying drawings.
具体实施方式,非限定实施例如下所述:The specific implementation, non-limiting examples are as follows:
实施例:图1所示,本实用新型包括相互连接的绝缘子4和导线5,设置有引弧电极1、氧化锌避雷器2和支撑横担3;Embodiment: As shown in Figure 1, the utility model includes interconnected insulators 4 and conductors 5, and is provided with an
引弧电极1固定于氧化锌避雷器2高压端,在导线5与氧化锌避雷器2之间形成一个放电间隙,提供雷击闪络通道;The arc
氧化锌避雷器2低压端固定于支撑横担3的右端,防止雷电过电压和截断工频续流;The low-voltage end of the zinc oxide arrester 2 is fixed on the right end of the supporting
支撑横担3的左端固定在绝缘子4下端的钢脚上。The left end of
图2所示,引弧电极1是一种从上到下包括引弧面1.1和固定螺孔1.2的U形金属结构体。固定螺孔1.2能够使引弧电极1固定在氧化锌避雷器2的高压端螺杆2.1上,拧紧螺母孔,将引弧电极1安装牢固;安装在线路上时,将导线5置于引弧电极1的引弧面1.1之上,形成导线5与氧化锌避雷器2之间的放电间隙。As shown in Fig. 2, the
图3所示,氧化锌避雷器2包括从上到下依次连接的高压端螺杆2.1、固定螺母2.2、压紧螺母2.3、复合外套2.4、多个串联的氧化锌阀片2.5、下复合外套2.7、下压紧螺母2.8、下固定螺母2.9和低压端螺杆2.6。As shown in Figure 3, the zinc oxide arrester 2 includes a high-voltage end screw 2.1, a fixed nut 2.2, a compression nut 2.3, a composite jacket 2.4, a plurality of series-connected zinc oxide valve pieces 2.5, a lower composite jacket 2.7, Lower compression nut 2.8, lower fixing nut 2.9 and low pressure end screw rod 2.6.
上、下复合外套2.4、2.7提供氧化锌避雷器2的外绝缘,保证足够的绝缘强度;The upper and lower composite jackets 2.4 and 2.7 provide the outer insulation of the zinc oxide arrester 2 to ensure sufficient insulation strength;
多个串联的氧化锌阀片2.5置于氧化锌避雷器2中心,能够限制雷电过电压和截断工频续流。Multiple series-connected zinc oxide valve slices 2.5 are placed in the center of the zinc oxide arrester 2, which can limit lightning overvoltage and cut off power frequency freewheeling.
另外,氧化锌避雷器2可选用符合JB/T 8952-2005《交流系统用复合外套金属氧化物避雷器》及GB11032-2000《交流无间隙金属氧化物避雷器》两个标准的规定的成品避雷器。In addition, the zinc oxide arrester 2 can be selected as a finished arrester that meets the two standards of JB/T 8952-2005 "Composite Metal Oxide Arrester for AC Systems" and GB11032-2000 "Gapless Metal Oxide Arrester for AC".
图4所示,支撑横担3是一种折弯的金属支撑片,左端设置有与绝缘子下端钢脚连接的开放性螺孔3.1,右端设置有与避雷器低压端螺杆连接的封闭性螺孔3.2。As shown in Figure 4, the
开放性螺孔3.1安装在绝缘子4的钢脚上,氧化锌避雷器2的低压端螺杆2.6安装在支撑横担3的封闭性螺孔3.2内,拧紧下压紧螺母2.8。The open screw hole 3.1 is installed on the steel foot of the insulator 4, the low-voltage end screw rod 2.6 of the zinc oxide arrester 2 is installed in the closed screw hole 3.2 of the
如此将氧化锌避雷器2并联在绝缘子4的侧面,起到防止雷击断线的作用。In this way, the zinc oxide arrester 2 is connected in parallel on the side of the insulator 4 to prevent disconnection due to lightning.
本实用新型的工作原理:Working principle of the utility model:
10kV架空配电线路的雷电过电压幅值高,放电时间短,而10kV配电线路的绝缘水平低,雷电过电压能够使绝缘子4发生闪络,在雷击闪络通道上形成工频续流烧断导线。The lightning overvoltage amplitude of 10kV overhead distribution lines is high and the discharge time is short, while the insulation level of 10kV distribution lines is low. Lightning overvoltage can cause flashover of insulator 4 and form power frequency freewheeling burning on the lightning flashover channel. Broken wire.
电网正常运行时,由于引弧电极1在导线与氧化锌避雷器2之间形成一个放电间隙,隔离工频电压,氧化锌避雷器2几乎不承受电压,同时设计合理的间隙,使氧化锌避雷器2在超过过电压时不动作,增长了氧化锌避雷器2的使用寿命;在直击雷或感应雷产生的雷电过电压作用下,空气间隙被击穿,氧化锌避雷器2本体呈现低阻抗,将雷电流泄放入地;雷电冲击过后,工频电压加载氧化锌避雷器2本体上,氧化锌避雷器2本体的电阻瞬间变大,通过的电流即电弧电流被抑制在较低数值,空气间隙弧压降增大,空气间隙的绝缘迅速恢复,电弧在极短时间内自然熄灭,工频续流被完全遮断。When the power grid is in normal operation, because the
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102290177A (en) * | 2011-07-27 | 2011-12-21 | 武汉水院电气有限责任公司 | 10kV multi-stage series gap lightning stroke flashover protector with arc striking electrode |
CN105023668A (en) * | 2015-06-29 | 2015-11-04 | 蔡桂钧 | Zinc oxide arrester for power plant |
CN105869802A (en) * | 2016-05-31 | 2016-08-17 | 上海电瓷厂有限公司 | Detachable rotary horizontal all-insulation arrester with disconnector |
CN109767886A (en) * | 2019-03-27 | 2019-05-17 | 长沙理工大学 | Protection device for 10kV insulated conductor against lightning strike and disconnection and method for determining installation distance |
CN111739702A (en) * | 2020-05-11 | 2020-10-02 | 国网浙江江山市供电有限公司 | Lightning protection flashover protector |
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2009
- 2009-01-20 CN CNU2009201427742U patent/CN201348907Y/en not_active Expired - Fee Related
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102290177A (en) * | 2011-07-27 | 2011-12-21 | 武汉水院电气有限责任公司 | 10kV multi-stage series gap lightning stroke flashover protector with arc striking electrode |
CN102290177B (en) * | 2011-07-27 | 2012-12-19 | 武汉水院电气有限责任公司 | 10kV multi-stage series gap lightning stroke flashover protector with arc striking electrode |
CN105023668A (en) * | 2015-06-29 | 2015-11-04 | 蔡桂钧 | Zinc oxide arrester for power plant |
CN105869802A (en) * | 2016-05-31 | 2016-08-17 | 上海电瓷厂有限公司 | Detachable rotary horizontal all-insulation arrester with disconnector |
CN105869802B (en) * | 2016-05-31 | 2018-07-06 | 上海电瓷厂有限公司 | A kind of detachable rotary-type pressure-bearing type all insulation arrester of band disconnector |
CN109767886A (en) * | 2019-03-27 | 2019-05-17 | 长沙理工大学 | Protection device for 10kV insulated conductor against lightning strike and disconnection and method for determining installation distance |
CN109767886B (en) * | 2019-03-27 | 2021-01-12 | 长沙理工大学 | 10kV insulated conductor lightning protection device for preventing breakage and installation distance determining method |
CN111739702A (en) * | 2020-05-11 | 2020-10-02 | 国网浙江江山市供电有限公司 | Lightning protection flashover protector |
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