CN104882876B - A kind of extra-high voltage direct current ground electrode circuit guard system - Google Patents

A kind of extra-high voltage direct current ground electrode circuit guard system Download PDF

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CN104882876B
CN104882876B CN201510345132.2A CN201510345132A CN104882876B CN 104882876 B CN104882876 B CN 104882876B CN 201510345132 A CN201510345132 A CN 201510345132A CN 104882876 B CN104882876 B CN 104882876B
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arrester
crossarm
tower body
insulator
conductor
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CN104882876A (en
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何慧雯
周沛洪
戴敏
王磊
万磊
娄颖
李振强
范冕
李晓岚
査志鹏
刘志芹
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Abstract

本发明提供一种特高压直流接地极线路防护系统,包括杆塔本体、设于杆塔本体上的避雷线横担和接地极导线横担,避雷线横担两端分别固定避雷线,接地极导线横担两端分别通过绝缘子S1和绝缘子S2固定接地极导线,接地极导线与绝缘子S1的连接端与间隙C1的一端连接,接地极导线与绝缘子S2的连接端与间隙C2的一端连接,间隙C1的另一端和间隙C2的另一端均与避雷器的一端连接,避雷器的另一端与杆塔本体相连。该技术方案可减少特高压直流接地极线路因招弧角闪络导致单极甚至双极闭锁的事故,并可实现一台避雷器即可保护两根接地极线路,保证不平衡电流保护设备、接地极线路断线检测保护设备正确运行,不受避雷器对地电容的影响。

The invention provides a UHV DC grounding electrode line protection system, which includes a tower body, a lightning protection wire crossarm and a grounding electrode wire crossarm arranged on the tower body. The two ends of the pole are respectively fixed by the insulator S1 and the insulator S2, the connection end of the ground electrode wire and the insulator S1 is connected to one end of the gap C1, the connection end of the ground electrode wire and the insulator S2 is connected to one end of the gap C2, and the gap C1 Both the other end and the other end of the gap C2 are connected to one end of the arrester, and the other end of the arrester is connected to the tower body. This technical solution can reduce the accidents of unipolar or even bipolar blocking caused by flashover of UHV DC grounding pole lines, and can realize that one arrester can protect two grounding pole lines, ensuring unbalanced current protection equipment, grounding Pole line disconnection detection and protection equipment operate correctly without being affected by the capacitance of the arrester to ground.

Description

一种特高压直流接地极线路防护系统A UHV DC Grounding Electrode Line Protection System

技术领域technical field

本发明涉及一种防护系统,具体讲涉及一种特高压直流接地极线路雷电和操作过电压防护系统。The invention relates to a protection system, in particular to a lightning and operation overvoltage protection system for an UHV DC grounding electrode line.

背景技术Background technique

现有的±800kV和±1000kV特高压直流接地极线路一般采用绝缘子串并联招弧角的方式防止雷电和操作过电压对线路造成损害;特高压直流接地极线路的空气间隙与绝缘子串长的雷电配合系数为0.7~0.85。在雷击下或操作过电压下,招弧角先于绝缘子串闪络,让直流工作续流流经招弧角,而不流经绝缘子串,避免电弧烧坏绝缘子串,发生掉串,且有利于招弧角上的直流电流熄弧。The existing ±800kV and ±1000kV UHV DC grounding electrode lines generally adopt the method of insulators connected in series and parallel to prevent lightning and operating overvoltage from causing damage to the line; The fit coefficient is 0.7-0.85. Under lightning strike or operating overvoltage, the arcing angle flashes ahead of the insulator string, so that the DC continuous current flows through the arcing angle instead of the insulator string, so as to prevent the arc from burning out the insulator string, causing string drop, and It is beneficial to the DC current arc extinguishing on the arc striking angle.

但招弧角的放电特性和流过运行直流电流后的熄灭特性受环境因素的影响很大,不稳定。双极运行方式下,单极因雷击接地故障时,健全极转为单极大地运行方式,若接地极线路遭受直击雷和感应雷,导致招弧角闪络,则直流运行电流会流过招弧角,因直流运行电流无过零点,招弧角难以熄弧,需执行快速停运,闭锁两端换流器,切断流经招弧角的直流电流后,再重新启动。However, the discharge characteristics of the striking arc angle and the extinguishing characteristics after flowing the operating DC current are greatly affected by environmental factors and are unstable. In the double-pole operation mode, when the single pole is grounded due to lightning strike, the healthy pole will turn into a single-pole ground operation mode. If the grounded pole line is subjected to direct lightning strikes and induction lightning, resulting in flashover of the arc angle, the DC operating current will flow through the arc. Because the DC operating current has no zero-crossing point, it is difficult to extinguish the arc at the arcing angle. It is necessary to perform a quick shutdown, block the converters at both ends, cut off the DC current flowing through the arcing angle, and then restart.

在人口稠密、交流变电站多的地区,受走廊的限制和接地极线路架设地址选择困难的影响,±800kV和±1000kV直流线路可能与接地极线路同杆架设,同杆架设的极线与接地极线路为强耦合线路。双极运行时,若其中任意一极线遭受雷电绕击,雷电行波将沿极线传播到同杆架设段,由于接地极线路上绝缘水平较低,雷电行波在接地极线路的感应过电压可导致接地极线上多处招弧角闪络;当雷电直击同杆架设线路塔顶或架空地线时,流经杆塔入地的雷电流也可导致招弧角反击闪络,因此,同杆架设的接地极线路雷击闪络概率远高于接地极线路单独架设的情况。In densely populated areas with many AC substations, due to the limitation of corridors and the difficulty in selecting the location for the erection of grounding electrode lines, ±800kV and ±1000kV DC lines may be erected on the same pole as the grounding pole line, and the pole lines and grounding poles erected on the same pole The lines are strongly coupled lines. During bipolar operation, if any one of the pole lines is struck by lightning, the traveling lightning wave will propagate along the pole line to the erection section of the same pole. The voltage can cause flashover at multiple arcing angles on the grounding pole line; when lightning directly strikes the top of the line tower or overhead ground wire erected on the same pole, the lightning current flowing through the tower and entering the ground can also cause flashover at the arcing angle. Therefore, The lightning flashover probability of the ground electrode lines erected on the same pole is much higher than that of the ground electrode lines erected alone.

双极运行时,若雷电绕击或反击导致一极线发生接地故障,则健全极的极线上将感应出操作过电压,操作过电压行波会传递到同杆架设段,并经电磁和电容耦合在接地极线上感应出较高的操作过电压,尤以逆变站高端换流变阀侧和同杆架设段极线发生接地故障后,在接地极线路上产生的操作过电压最高,这种操作过电压可导致招弧角闪络。运行经验表明±800kV接地极线路多次因招弧角闪络导致单极甚至双极闭锁,或发生招弧角不能熄弧持续燃烧直至招弧角烧毁、绝缘子串掉串的大事故。During bipolar operation, if lightning shielding or counterattack causes a ground fault on one pole line, the operating overvoltage will be induced on the pole line of the healthy pole, and the traveling wave of the operating overvoltage will be transmitted to the erection section of the same pole, and will be transmitted Capacitive coupling induces a high operating overvoltage on the ground pole line, especially after the ground fault occurs on the high-end converter valve side of the inverter station and the pole line of the section erected on the same pole, the operating overvoltage generated on the ground pole line is the highest , this operating overvoltage can lead to arc flashover. The operation experience shows that the ±800kV grounding electrode line has repeatedly caused unipolar or even bipolar blockage due to the flashover of the arc angle, or there have been major accidents where the arc angle cannot be extinguished and continued to burn until the arc angle is burned, and the insulators have been dropped.

发明内容Contents of the invention

为了解决现有技术中所存在的上述不足,本发明提供一种特高压直流接地极线路防护系统。In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a UHV DC grounding electrode line protection system.

本发明提供的技术方案是:一种特高压直流接地极线路防护系统,包括杆塔本体、设于所述杆塔本体上的避雷线横担和接地极导线横担,所述避雷线横担两端分别固定避雷线,所述接地极导线横担两端分别通过绝缘子S1和绝缘子S2固定接地极导线,其改进之处在于:所述接地极导线与所述绝缘子S1的连接端与间隙C1的一端连接,所述接地极导线与所述绝缘子S2的连接端与间隙C2的一端连接,所述间隙C1的另一端和间隙C2的另一端均与避雷器的一端连接,所述避雷器的另一端与杆塔本体相连。The technical solution provided by the present invention is: a UHV DC grounding electrode line protection system, including a tower body, a lightning protection wire crossarm and a grounding electrode wire crossarm arranged on the tower body, the two ends of the lightning protection wire crossarm The lightning conductors are respectively fixed, and the two ends of the cross arm of the ground electrode wire are respectively fixed by the insulator S1 and the insulator S2. connection, the connecting end of the ground electrode wire and the insulator S2 is connected to one end of the gap C2, the other end of the gap C1 and the other end of the gap C2 are connected to one end of the arrester, and the other end of the arrester is connected to the tower Ontology connected.

优选的,所述杆塔本体、所述避雷线横担和所述接地极导线横担均为角钢桁架,所述避雷线横担高于且平行于所述接地极导线横担,所述避雷线横担和所述接地极导线横担的竖直中垂线与所述杆塔本体的轴线重合。Preferably, the tower body, the lightning conductor cross-arm and the ground electrode conductor cross-arm are all angle steel trusses, the lightning conductor cross-arm is higher than and parallel to the ground pole conductor cross-arm, and the lightning conductor The vertical mid-perpendicular line of the cross arm and the ground electrode wire cross arm coincides with the axis of the tower body.

优选的,所述杆塔本体上设有用于固定所述避雷线横担和所述接地极导线横担的安装孔,所述避雷线横担和所述接地极导线横担上均设有孔径与所述杆塔本体上安装孔的孔径对应相等的螺孔;所述避雷线横担和所述接地极导线横担通过贯穿所述安装孔和所述螺孔的螺栓固定在所述杆塔本体上。Preferably, the tower body is provided with installation holes for fixing the lightning conductor cross-arm and the ground electrode conductor cross-arm, and the lightning conductor cross-arm and the ground electrode conductor cross-arm are provided with apertures and The apertures of the installation holes on the tower body correspond to the same screw holes; the lightning conductor crossarm and the grounding electrode wire crossarm are fixed on the tower body by bolts passing through the installation holes and the screw holes.

优选的,所述避雷线横担的两端分别开有用于固定避雷线线夹的固定孔;所述避雷线线夹上设有孔径与固定孔的孔径对应相等的螺孔,所述避雷线线夹通过贯穿所述固定孔和所述螺孔的螺栓固定在所述避雷线横担两端;所述避雷线通过所述避雷线线夹水平方向垂直固定在所述避雷线横担两端。Preferably, the two ends of the cross-arm of the lightning conductor are respectively provided with fixing holes for fixing the clamp of the lightning conductor; the clamp of the lightning conductor is provided with a screw hole whose aperture is equal to that of the fixing hole, and the lightning conductor The clamps are fixed on both ends of the cross-arm of the lightning conductor through the bolts passing through the fixing hole and the screw hole; the lightning conductor is fixed on both ends of the cross-arm of the lightning conductor horizontally and vertically .

优选的,所述绝缘子为悬式绝缘子,所述悬式绝缘子的一端设有绝缘子金具,另一端设有线夹;所述绝缘子金具和所述接地极导线横担两端分别设有大小对应的螺孔,所述绝缘子金属通过螺栓和螺母固定在所述接地极导线横担两端;所述线夹夹紧所述接地极导线。Preferably, the insulator is a suspension insulator, one end of the suspension insulator is provided with an insulator fitting, and the other end is provided with a clamp; holes, the insulator metal is fixed on both ends of the grounding electrode wire cross-arm through bolts and nuts; the clamp clamps the grounding electrode wire.

优选的,所述避雷器为悬挂式避雷器;所述避雷器的高压端和低压端均设有避雷器金具;Preferably, the arrester is a suspension arrester; both the high-voltage end and the low-voltage end of the arrester are equipped with arrester fittings;

低压端的避雷器金具包括长方形金属板、分别垂直设于所述长方形金属板两端的连接板和金属线夹;The lightning arrester hardware at the low-voltage end includes a rectangular metal plate, connecting plates and metal wire clips that are vertically arranged at both ends of the rectangular metal plate;

所述连接板和所述杆塔本体的角钢桁架上设有大小对应相等的螺孔,所述连接板通过贯穿所述螺孔的螺栓和螺母与所述杆塔本体固定,所述杆塔本体上的螺孔位置低于或等于所述接地极导线横担的高度;所述金属线夹与所述避雷器低压端固定。The connecting plate and the angle steel truss of the tower body are provided with screw holes corresponding to the same size, and the connecting plate is fixed to the tower body through bolts and nuts passing through the screw holes, and the screw on the tower body The position of the hole is lower than or equal to the height of the cross arm of the ground electrode wire; the metal clamp is fixed to the low-voltage end of the arrester.

优选的,所述间隙一端通过绝缘子线夹与接地极导线连接,另一端通过硬导线与避雷器高压端的金具连接。Preferably, one end of the gap is connected to the ground electrode wire through an insulator clamp, and the other end is connected to the metal fitting at the high voltage end of the arrester through a hard wire.

优选的,所述间隙的间距为特高压直流接地极线路以单极大地方式和过负荷方式运行时,间隙在过负荷直流电流下的压降不产生电晕时所对应的长度。Preferably, the distance between the gaps is the length corresponding to when the voltage drop of the gap under the overload direct current does not produce corona when the UHV DC grounding electrode line operates in a single pole ground mode and an overload mode.

进一步,避雷器与杆塔本体之间的距离大于所述间隙的间距。Further, the distance between the lightning arrester and the tower body is greater than the distance between the gaps.

与最接近的技术方案相比,本发明具有如下显著进步:Compared with the closest technical solution, the present invention has the following remarkable progress:

(1)本技术方案中间隙与悬挂式避雷器串联后与绝缘子并联,由于悬挂式避雷器的作用,即使单独架设或与极线同杆架设接地极线路闪络接地导致间隙击穿,间隙中流过的直流运行电流也会很快降低,解决了招弧角在直流运行电流流过时难以熄弧的问题,减少特高压直流接地极线路因招弧角闪络导致单极甚至双极闭锁的事故。(1) In this technical solution, the gap is connected in series with the suspension arrester and then connected in parallel with the insulator. Due to the effect of the suspension arrester, even if the ground electrode line is erected alone or on the same pole as the pole line, the flashover grounding of the ground electrode line will cause the gap to break down, and the electricity flowing through the gap The DC operating current will also be reduced quickly, which solves the problem that the arcing angle is difficult to extinguish when the DC operating current flows, and reduces the accidents of unipolar or even bipolar blocking caused by the flashover of the arcing angle of the UHV DC grounding electrode line.

(2)本技术方案中选择悬挂式避雷器使得避雷器在杆塔上安装更加方便,间隙与悬挂式避雷器高压端相连,在正常运行时,悬挂式避雷器上不会受到直流工作电压的作用,延长了避雷器的使用寿命。(2) The suspension arrester selected in this technical solution makes it more convenient to install the arrester on the tower, and the gap is connected to the high-voltage end of the suspension arrester. During normal operation, the suspension arrester will not be affected by the DC working voltage, which extends the length of the arrester. service life.

(3)本技术方案中两侧接地极导线分别连接间隙C1的一端和间隙C2的一端,间隙C1的另一端和间隙C2的另一端均与避雷器的一端连接,避雷器的另一端与杆塔本体相连,可实现一台避雷器即可保护两根接地极线路,保证不平衡电流保护设备、接地极线路断线检测保护设备正确运行,不受避雷器对地电容的影响。(3) In this technical solution, the ground electrode wires on both sides are respectively connected to one end of the gap C1 and one end of the gap C2, the other end of the gap C1 and the other end of the gap C2 are connected to one end of the arrester, and the other end of the arrester is connected to the tower body , It can realize that one arrester can protect two grounding electrode lines, ensure the correct operation of unbalanced current protection equipment and grounding electrode line disconnection detection and protection equipment, and is not affected by the capacitance of the arrester to the ground.

(4)避雷器的低压端通过低压端的避雷器金具与杆塔本体固定,可保证悬挂式避雷器与杆塔本体的距离大于特高压直流接地极线路以单极大地方式运行时,间隙在过负荷直流电流下的压降不产生电晕时所对应的间距,从而保证间隙在故障情况下击穿后避雷器高压端不会对杆塔本体放电。(4) The low-voltage end of the arrester is fixed to the tower body through the arrester fittings at the low-voltage end, which can ensure that the distance between the suspended arrester and the tower body is greater than the voltage of the gap under the overload DC current when the UHV DC grounding electrode line operates in a single-pole mode. Reduce the corresponding spacing when no corona is generated, so as to ensure that the high-voltage end of the arrester will not discharge the tower body after the gap breaks down in the event of a fault.

(5)间隙通过硬导线与避雷器相连,可保证连接导线不随风摆动,确保正常运行时硬导线与其他部件的相对距离。(5) The gap is connected to the lightning arrester through hard wires, which can ensure that the connecting wires do not swing with the wind, and ensure the relative distance between the hard wires and other components during normal operation.

附图说明Description of drawings

图1为本发明提供的特高压直流接地极线路防护系统的结构原理图。Fig. 1 is a structural principle diagram of the UHV DC grounding electrode line protection system provided by the present invention.

图2为避雷器低压端与杆塔本体的连接原理图。Figure 2 is a schematic diagram of the connection between the low-voltage end of the arrester and the tower body.

图3为绝缘子与接地极导线和间隙的连接原理图。Figure 3 is a schematic diagram of the connection between the insulator and the ground electrode wire and the gap.

其中:1-杆塔本体;2-避雷线横担;3-避雷线;4-接地极导线横担;5-绝缘子;6-接地极导线;7-避雷器;8-杆塔本体的角钢桁架;9-螺母;10-螺栓;11-低压端的避雷器金具;12-绝缘子线夹;13-间隙。Among them: 1- tower body; 2- lightning protection wire cross arm; 3- lightning protection wire; 4- grounding electrode wire cross arm; 5- insulator; 6- grounding electrode wire; -nut; 10-bolt; 11-lightning arrester hardware at the low-voltage end; 12-insulator clamp; 13-gap.

具体实施方式Detailed ways

为了更好地理解本发明,下面结合说明书附图和实例对本发明的内容做进一步的说明。In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples.

本发明提供的特高压直流接地极线路防护系统如图1所示,主要用于防止雷电和操作过电压对特高压直流接地极线路造成损害;防护系统包括竖直架设的杆塔本体1、设于所述杆塔本体1上且竖直中垂线与所述杆塔本体1轴线重合的避雷线横担2和接地极导线横担4;其中避雷线横担2高于且平行于接地极导线横担4;The UHV DC grounding electrode line protection system provided by the present invention is shown in Figure 1, which is mainly used to prevent lightning and operating overvoltage from causing damage to the UHV DC grounding electrode line; the protection system includes a vertically erected tower body 1, a The lightning conductor cross-arm 2 and the grounding electrode conductor crossarm 4 on the tower body 1 and the vertical mid-perpendicular line coincides with the axis of the tower body 1; wherein the lightning conductor crossarm 2 is higher than and parallel to the ground pole conductor crossarm 4;

所述接地极导线横担4两端分别通过绝缘子S1和绝缘子S2固定接地极导线6,所述接地极导线6与所述绝缘子S1的连接端与间隙C1的一端连接,所述接地极导线6与所述绝缘子S2的连接端与间隙C2的一端连接,所述间隙C1的另一端和间隙C2的另一端均与避雷器7的一端连接,所述避雷器7的另一端与杆塔本体1相连;间隙C1和C2为空气间隙,当发生过电压时,间隙之间的空气会被击穿,击穿后,间隙与避雷器7串联,防止绝缘子S1和S2受到过电压损害;这种连接方式可实现用一台避雷器7保护两根接地极线路,保证不平衡电流保护设备、接地极线路断线检测保护设备正确运行,不受避雷器7对地电容的影响。The two ends of the ground electrode wire cross arm 4 are respectively fixed by the insulator S1 and the insulator S2 to fix the ground electrode wire 6, the connection end of the ground electrode wire 6 is connected to the connection end of the insulator S1 and one end of the gap C1, and the ground electrode wire 6 The connecting end of the insulator S2 is connected to one end of the gap C2, the other end of the gap C1 and the other end of the gap C2 are connected to one end of the arrester 7, and the other end of the arrester 7 is connected to the tower body 1; the gap C1 and C2 are air gaps. When an overvoltage occurs, the air between the gaps will be broken down. After the breakdown, the gap is connected in series with the arrester 7 to prevent the insulators S1 and S2 from being damaged by the overvoltage; this connection method can be used One lightning arrester 7 protects two grounding electrode lines to ensure the correct operation of the unbalanced current protection equipment and the grounding electrode line disconnection detection protection equipment, and is not affected by the ground capacitance of the lightning arrester 7 .

所述杆塔本体1、所述避雷线横担2和所述接地极导线横担4均为角钢桁架,所述杆塔本体的角钢桁架8上设有用于固定所述避雷线横担2和所述接地极导线横担4的安装孔,所述避雷线横担2和所述接地极导线横担4上均设有孔径与所述杆塔本体1上安装孔的孔径对应相等的螺孔;所述避雷线横担2和所述接地极导线横担4通过贯穿所述安装孔和所述螺孔的螺栓固定在所述杆塔本体1上。The tower body 1, the lightning conductor cross arm 2 and the grounding electrode conductor cross arm 4 are all angle steel trusses, and the angle steel truss 8 of the tower body is provided with a truss for fixing the lightning conductor cross arm 2 and the The installation hole of the ground electrode wire cross arm 4, the lightning protection wire cross arm 2 and the ground electrode wire cross arm 4 are all provided with screw holes with apertures corresponding to the apertures of the installation holes on the tower body 1; The lightning conductor crossarm 2 and the ground electrode conductor crossarm 4 are fixed on the tower body 1 through bolts passing through the installation holes and the screw holes.

所述避雷线横担2的两端分别开有用于固定避雷线线夹的固定孔;所述避雷线线夹上设有孔径与固定孔的孔径对应相等的螺孔,所述避雷线线夹通过贯穿所述固定孔和所述螺孔的螺栓固定在所述避雷线横担2两端;所述避雷线线夹加紧避雷线3,所述避雷线3水平方向垂直固定在所述避雷线横担2两端。The two ends of the lightning conductor cross-arm 2 are respectively provided with fixing holes for fixing the lightning conductor clamps; the lightning conductor clamps are provided with screw holes whose apertures are equal to the apertures of the fixing holes, and the lightning conductor clamps The bolts passing through the fixing holes and the screw holes are fixed at both ends of the lightning conductor cross-arm 2; the lightning conductor clamp tightens the lightning conductor 3, and the lightning conductor 3 is fixed horizontally and vertically on the lightning conductor Cross arm 2 two ends.

所述避雷器7为悬挂式避雷器,使得避雷器7在杆塔上安装更加方便;所述避雷器7的高压端和低压端均设有避雷器金具;避雷器7高压端通过避雷器金具与间隙13相连,在正常运行时,悬挂式避雷器上不会受到直流工作电压的作用,延长了避雷器7的使用寿命。The arrester 7 is a suspended arrester, which makes it more convenient to install the arrester 7 on the tower; the high-voltage end and the low-voltage end of the arrester 7 are provided with arrester fittings; the high-voltage end of the arrester 7 is connected to the gap 13 through the arrester fittings. , the suspension arrester will not be affected by the DC working voltage, prolonging the service life of the arrester 7 .

如图2所示:低压端的避雷器金具11包括长方形金属板、分别垂直设于所述长方形金属板两端的连接板和金属线夹;As shown in Figure 2: the lightning arrester hardware 11 at the low-voltage end includes a rectangular metal plate, connecting plates and metal wire clips that are vertically arranged at both ends of the rectangular metal plate;

所述连接板和所述杆塔本体的角钢桁架8上设有大小对应相等的螺孔,所述连接板通过贯穿所述螺孔的螺栓10和螺母9与所述杆塔本体1固定,所述杆塔本体1上的螺孔位置低于或等于所述接地极导线横担4的高度;所述金属线夹与所述避雷器7低压端固定。The connecting plate and the angle steel truss 8 of the tower body are provided with screw holes corresponding to the same size, and the connecting plate is fixed to the tower body 1 through bolts 10 and nuts 9 passing through the screw holes. The position of the screw hole on the body 1 is lower than or equal to the height of the ground electrode wire cross arm 4; the metal clamp is fixed to the low-voltage end of the arrester 7 .

避雷器7的低压端通过低压端的避雷器金具11与杆塔本体1固定,可保证悬挂式避雷器7与杆塔本体1的距离大于特高压直流接地极线路以单极大地方式运行时,间隙13在过负荷直流电流下的压降不产生电晕时所对应的间距,从而保证间隙13在故障情况下击穿后,避雷器7的高压端不会对杆塔本体1放电。The low-voltage end of the arrester 7 is fixed to the tower body 1 through the arrester fitting 11 at the low-voltage end, which can ensure that the distance between the suspended arrester 7 and the tower body 1 is greater than that of the UHV DC grounding electrode line. The distance corresponding to the voltage drop that flows down does not produce corona, thereby ensuring that the high-voltage end of the arrester 7 will not discharge the tower body 1 after the gap 13 breaks down under fault conditions.

所述间隙13的间距为特高压直流接地极线路以单极大地方式和过负荷方式运行时,间隙13在过负荷直流电流下的压降不产生电晕时所对应的长度。The distance between the gaps 13 is the length corresponding to when the voltage drop of the gaps 13 under the overload DC current does not produce corona when the UHV DC grounding electrode line operates in a single pole ground mode and an overload mode.

如图3所示:所述绝缘子5为悬式绝缘子,所述悬式绝缘子的一端设有绝缘子金具,另一端设有线夹;所述绝缘子金具和所述接地极导线横担4两端分别设有大小对应的螺孔,所述绝缘子金属通过螺栓和螺母固定在所述接地极导线横担4两端;As shown in Figure 3: the insulator 5 is a suspension insulator, one end of the suspension insulator is provided with an insulator fitting, and the other end is provided with a wire clip; There are screw holes corresponding to the size, and the insulator metal is fixed at both ends of the ground electrode wire cross arm 4 through bolts and nuts;

所述线夹夹紧所述接地极导线6并连接所述间隙13的一端,所述间隙13的另一端通过硬导线与避雷器7高压端的金具连接,可保证连接导线不随风摆动,确保正常运行时硬导线与其他部件的相对距离。The clamp clamps the ground electrode wire 6 and connects one end of the gap 13, and the other end of the gap 13 is connected to the metal fitting at the high voltage end of the arrester 7 through a hard wire, so that the connecting wire does not swing with the wind and ensures normal operation. The relative distance of hard wires to other components at runtime.

所述避雷器7的额定电压通过以下步骤确定:The rated voltage of the arrester 7 is determined by the following steps:

步骤1:建立仿真计算模型计算换流变最高和最低换流变阀侧发生对地闪络、换相失败或线路沿线接地故障时在接地极线路产生操作过电压、或雷电绕击或反击接地极线路产生过电压的故障时,避雷器的雷电和操作过电压保护水平;Step 1: Establish a simulation calculation model to calculate the ground flashover, commutation failure, or ground fault along the line at the highest and lowest converter valve sides of the converter transformer. Operation overvoltage, lightning shielding or counter-grounding occurs on the ground electrode line When an overvoltage fault occurs in the pole line, the lightning and operating overvoltage protection level of the arrester;

步骤2:进行绝缘配合选择绝缘子串空气间隙与避雷器保护水平;Step 2: Perform insulation coordination to select the air gap of the insulator string and the protection level of the arrester;

步骤3:根据避雷器保护水平和中性母线额定电压选择相应避雷器额定电压。Step 3: Select the corresponding rated voltage of the arrester according to the protection level of the arrester and the rated voltage of the neutral bus.

以上仅为本发明的实施例而已,并不用于限制本发明,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均在申请待批的本发明的权利要求范围之内。The above is only an embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are all pending applications for the rights of the present invention. within the scope of requirements.

Claims (9)

1.一种特高压直流接地极线路防护系统,包括杆塔本体、设于所述杆塔本体上的避雷线横担和接地极导线横担,所述避雷线横担两端分别固定避雷线,所述接地极导线横担两端分别通过绝缘子S1和绝缘子S2固定接地极导线,其特征在于:所述接地极导线与所述绝缘子S1的连接端与间隙C1的一端连接,所述接地极导线与所述绝缘子S2的连接端与间隙C2的一端连接,所述间隙C1的另一端和间隙C2的另一端均与避雷器的一端连接,所述避雷器的另一端与杆塔本体相连。1. A UHV DC grounding pole line protection system, comprising a tower body, a lightning conductor crossarm and a grounding pole wire crossarm arranged on the pole tower body, and lightning conductors are respectively fixed at both ends of the lightning conductor crossarm, so that The two ends of the cross-arm of the ground electrode wire are respectively fixed by the insulator S1 and the insulator S2. The connecting end of the insulator S2 is connected to one end of the gap C2, the other end of the gap C1 and the other end of the gap C2 are both connected to one end of the arrester, and the other end of the arrester is connected to the tower body. 2.如权利要求1所述的一种特高压直流接地极线路防护系统,其特征在于:2. A UHV DC grounding electrode line protection system as claimed in claim 1, characterized in that: 所述杆塔本体、所述避雷线横担和所述接地极导线横担均为角钢桁架,所述避雷线横担高于且平行于所述接地极导线横担,所述避雷线横担和所述接地极导线横担的竖直中垂线与所述杆塔本体的轴线重合。The tower body, the lightning conductor crossarm and the grounding pole conductor crossarm are all angle steel trusses, the lightning conductor crossarm is higher than and parallel to the ground pole conductor crossarm, and the lightning conductor crossarm and The vertical mid-perpendicular line of the ground electrode conductor cross-arm coincides with the axis of the tower body. 3.如权利要求1所述的一种特高压直流接地极线路防护系统,其特征在于:3. A UHV DC grounding electrode line protection system as claimed in claim 1, characterized in that: 所述杆塔本体上设有用于固定所述避雷线横担和所述接地极导线横担的安装孔,所述避雷线横担和所述接地极导线横担上均设有孔径与所述杆塔本体上安装孔的孔径对应相等的螺孔;所述避雷线横担和所述接地极导线横担通过贯穿所述安装孔和所述螺孔的螺栓固定在所述杆塔本体上。The tower body is provided with mounting holes for fixing the lightning conductor crossarm and the grounding electrode conductor crossarm, and both the lightning conductor crossarm and the grounding conductor conductor crossarm are provided with apertures corresponding to the pole tower. The apertures of the mounting holes on the body correspond to equal screw holes; the lightning conductor crossarm and the grounding electrode conductor crossarm are fixed on the tower body by bolts passing through the mounting holes and the screw holes. 4.如权利要求1所述的一种特高压直流接地极线路防护系统,其特征在于:4. A UHV DC grounding electrode line protection system as claimed in claim 1, characterized in that: 所述避雷线横担的两端分别开有用于固定避雷线线夹的固定孔;所述避雷线线夹上设有孔径与固定孔的孔径对应相等的螺孔,所述避雷线线夹通过贯穿所述固定孔和所述螺孔的螺栓固定在所述避雷线横担两端;所述避雷线通过所述避雷线线夹水平方向垂直固定在所述避雷线横担两端。The two ends of the cross-arm of the lightning conductor are respectively provided with fixing holes for fixing the clamp of the lightning conductor; the clamp of the lightning conductor is provided with a screw hole whose aperture is equal to that of the fixing hole, and the clamp of the lightning conductor passes through Bolts passing through the fixing holes and the screw holes are fixed to both ends of the lightning conductor cross-arm; the lightning conductor is vertically fixed horizontally and vertically to both ends of the lightning conductor cross-arm through the lightning conductor clamp. 5.如权利要求1所述的一种特高压直流接地极线路防护系统,其特征在于:5. A UHV DC grounding electrode line protection system as claimed in claim 1, characterized in that: 所述绝缘子为悬式绝缘子,所述悬式绝缘子的一端设有绝缘子金具,另一端设有线夹;所述绝缘子金具和所述接地极导线横担两端分别设有大小对应的螺孔,所述绝缘子金具通过螺栓和螺母固定在所述接地极导线横担两端;所述线夹夹紧所述接地极导线。The insulator is a suspension insulator, one end of the suspension insulator is provided with an insulator fitting, and the other end is provided with a wire clamp; the two ends of the insulator fitting and the cross-arm of the ground electrode wire are respectively provided with corresponding screw holes, so The insulator fittings are fixed on both ends of the ground electrode wire cross-arm through bolts and nuts; the wire clamp clamps the ground electrode wire. 6.如权利要求1所述的一种特高压直流接地极线路防护系统,其特征在于:6. A UHV DC grounding electrode line protection system as claimed in claim 1, characterized in that: 所述避雷器为悬挂式避雷器;所述避雷器的高压端和低压端均设有避雷器金具;The arrester is a suspension arrester; both the high voltage end and the low voltage end of the arrester are equipped with arrester fittings; 低压端的避雷器金具包括长方形金属板、分别垂直设于所述长方形金属板两端的连接板和金属线夹;The lightning arrester hardware at the low-voltage end includes a rectangular metal plate, connecting plates and metal wire clips that are vertically arranged at both ends of the rectangular metal plate; 所述连接板和所述杆塔本体的角钢桁架上设有大小对应相等的螺孔,所述连接板通过贯穿所述螺孔的螺栓和螺母与所述杆塔本体固定,所述杆塔本体上的螺孔位置低于或等于所述接地极导线横担的高度;所述金属线夹与所述避雷器低压端固定。The connecting plate and the angle steel truss of the tower body are provided with screw holes corresponding to the same size, and the connecting plate is fixed to the tower body through bolts and nuts passing through the screw holes, and the screw on the tower body The position of the hole is lower than or equal to the height of the cross arm of the ground electrode wire; the metal clamp is fixed to the low-voltage end of the arrester. 7.如权利要求1所述的一种特高压直流接地极线路防护系统,其特征在于:7. A UHV DC grounding electrode line protection system as claimed in claim 1, characterized in that: 所述间隙一端通过绝缘子线夹与接地极导线连接,另一端通过硬导线与避雷器高压端的金具连接。One end of the gap is connected to the ground electrode wire through an insulator clamp, and the other end is connected to the metal fitting at the high voltage end of the arrester through a hard wire. 8.如权利要求1所述的一种特高压直流接地极线路防护系统,其特征在于:8. A UHV DC grounding electrode line protection system as claimed in claim 1, characterized in that: 所述间隙的间距为特高压直流接地极线路以单极大地方式和过负荷方式运行时,间隙在过负荷直流电流下的压降不产生电晕时所对应的长度。The distance between the gaps is the corresponding length when the voltage drop of the gap under the overload DC current does not produce corona when the UHV DC grounding electrode line operates in a single pole ground mode and an overload mode. 9.如权利要求8所述的一种特高压直流接地极线路防护系统,其特征在于:9. A UHV DC grounding electrode line protection system as claimed in claim 8, characterized in that: 避雷器与杆塔本体之间的距离大于所述间隙的间距。The distance between the lightning arrester and the tower body is greater than the distance between the gaps.
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CN105958464A (en) * 2016-05-30 2016-09-21 中国电力工程顾问集团中南电力设计院有限公司 EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method
CN105932547B (en) * 2016-06-22 2017-11-10 国网四川省电力公司电力科学研究院 A kind of ground electrode circuit condenser type is released can inter space device
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