CN102296864A - Novel tower for extra-high voltage dual-circuit compact transmission - Google Patents
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Abstract
本发明提供一种用于特高压同塔双回紧凑型输电线路的新型塔型,其由:上侧横担、v型绝缘子串、I型中直串、下相柔性绝缘子、下侧横担和塔身组成,其特征在于:上层横担和下层横担之间挂装两回6相特高压等级导线;上侧两相导线悬挂于同一横担上,且该横担无侧边曲臂;下相导线由上、下绝缘子从相反方向施加拉力固定;固定下相导线的下侧绝缘子采用了柔性绝缘子,既使导线有一定弹性活动空间,又控制了导线的横向位移。本发明的新型塔型结构去除了下弯曲臂,避免了下弯曲臂在重荷载条件下弯曲变形,甚至断裂的可能;固定下相导线的下侧绝缘子采用了柔性绝缘子,既使导线有一定弹性活动空间,又控制了导线的横向位移。
The present invention provides a new type of tower for ultra-high voltage double-circuit compact transmission lines on the same tower, which consists of: upper side cross arm, V-type insulator string, I-type straight string, lower phase flexible insulator, lower side cross arm Composed with the tower body, it is characterized in that: two rounds of 6-phase UHV grade conductors are hung between the upper cross arm and the lower cross arm; the upper two phase conductors are suspended on the same cross arm, and the cross arm has no side crank arm The lower phase wire is fixed by pulling force applied from the opposite direction by the upper and lower insulators; the lower insulator for fixing the lower phase wire adopts a flexible insulator, which not only makes the wire have a certain elastic space, but also controls the lateral displacement of the wire. The novel tower structure of the present invention removes the lower bending arm, which avoids the possibility of the lower bending arm being bent, deformed or even broken under heavy load conditions; The active space controls the lateral displacement of the conductor.
Description
技术领域 technical field
本发明涉及一种用于特高压同塔双回紧凑型输电的新型塔型,属于电力系统输电线路杆塔设计领域,尤其涉及1000kV及以上特高压等级同塔双回紧凑型输电线路支撑三相导线形成绝缘间隙的杆塔结构设计方案。The invention relates to a new type of tower used for ultra-high voltage double-circuit compact power transmission on the same tower, which belongs to the field of power system transmission line pole tower design, and especially relates to 1000kV and above ultra-high voltage level double-circuit compact power transmission lines on the same tower supporting three-phase conductors The design scheme of the tower structure that forms the insulation gap.
背景技术 Background technique
为了降低电能输送的成本,减少输电走廊对土地的占用,采用特高压等级线路和紧凑型输电方式是两条很有效的途径,因此,特高压输电和紧凑型输电在世界各国均被作为远距离大容量输电的优选方案。根据我国电能远距离输送的需要,近几年我国在大力推动特高压电网建设,目前已经建成投运1000kV特高压试验示范工程,而且针对特高压输电技术的研究也在不断深入;紧凑型输电线路通过对导线的优化排列,将三相导线置于同一塔窗内,三相导线间无接地构件,达到提高自然输送功率,减少线路走廊宽度,提高单位走廊输电容量。近年来随着我国土地资源的日益紧缺,紧凑型线路在我国也得到了大力的发展,500kV单回及双回紧凑型线路已大量应用并实现了标准化。2008年西北电网公司完成了750kV单回及双回紧凑型线路的关键技术研究工作。为了在我国建设资源节约型、环境友好型电网,国家电网公司继续推进特高压电网科研及工程建设工作,提出了建设特高压紧凑型输电线路的规划。In order to reduce the cost of electric energy transmission and reduce the land occupation of transmission corridors, the use of UHV-grade lines and compact power transmission methods are two very effective ways. Therefore, UHV power transmission and compact power transmission are regarded as long-distance The optimal solution for large-capacity power transmission. According to the needs of long-distance transmission of electric energy in my country, my country has vigorously promoted the construction of UHV power grids in recent years. At present, a 1000kV UHV test demonstration project has been built and put into operation, and research on UHV transmission technology is also deepening; compact transmission lines Through the optimized arrangement of the wires, the three-phase wires are placed in the same tower window, and there is no grounding component between the three-phase wires, so as to increase the natural transmission power, reduce the width of the line corridor, and increase the transmission capacity of the unit corridor. In recent years, with the increasing shortage of land resources in our country, compact lines have also been vigorously developed in our country. 500kV single-circuit and double-circuit compact lines have been widely used and standardized. In 2008, Northwest Power Grid Corporation completed the key technology research work of 750kV single-circuit and double-circuit compact lines. In order to build a resource-saving and environment-friendly power grid in our country, the State Grid Corporation of China continues to promote the research and engineering construction of UHV power grids, and proposes a plan for the construction of UHV compact transmission lines.
由于紧凑型线路三相导线布置于同一塔窗内,相间无支撑构架,导线重力负荷全部集中在外侧塔窗上,使塔窗整体结构尺寸明显大于常规线路的杆塔构架尺寸,且对塔窗钢构架的机械强度要求更高。对于特高压紧凑型线路,导线分裂数增加、金具体积重量也进一步增大,导线对构架及导线间的绝缘距离提高,如750kV紧凑型塔窗相间距离为10m,而1000kV特高压紧凑型塔窗处导线间距可达到14m~15m,包拢三相导线的特高压紧凑型塔窗构架庞大,构架机械负荷大,杆塔投资多。所以特高压紧凑型塔窗设计时,需要在保证杆塔承载强度及电气绝缘强度的同时,优化杆塔结构尺寸,降低特高压紧凑型线路建设成本。Since the three-phase conductors of the compact line are arranged in the same tower window, there is no supporting frame between the phases, and the gravity load of the conductors is all concentrated on the outer tower window, so that the overall structure size of the tower window is significantly larger than the size of the tower frame of the conventional line, and the tower window steel The mechanical strength requirements of the frame are higher. For ultra-high voltage compact lines, the number of wire splits increases, the volume and weight of the metal body further increase, and the insulation distance between the wires and the frame and between wires increases. The distance between conductors can reach 14m to 15m, and the ultra-high voltage compact tower window covering three-phase conductors has a huge structure, a large mechanical load on the structure, and a large investment in the tower. Therefore, when designing UHV compact tower windows, it is necessary to optimize the structural size of the tower while ensuring the bearing strength and electrical insulation strength of the tower to reduce the construction cost of the UHV compact line.
如图1所示,目前我国同塔双回紧凑型杆塔均采用T形结构,上侧两相V型串导线由横梁承载,下侧V串由塔身和横梁端部下弯曲臂承载,由于下相V串夹角通常在130°~140°范围内,导致沿绝缘子串拉力可达到上相V串(夹角85°~95°)绝缘子拉力的2倍。为了保证下弯曲臂不受拉变形,通常设计尺寸较大,提高了杆塔成本。如特高压同塔双回紧凑型杆塔仍沿用该种塔型,则T形塔下弯曲臂为确保有足够的承载力,设计尺寸将明显增大,且抗大风、重覆冰等重荷载的能力较差。为此,针对特高压同塔双回紧凑杆塔荷载及导线布置特点,需要在现有塔型结构基础上进一步创新,以适应我国后续特高压工程建设需要。As shown in Figure 1, at present, the double-circuit compact poles and towers of the same tower in my country adopt T-shaped structures. The included angle of phase V strings is usually in the range of 130° to 140°, resulting in the tension along the insulator strings being twice that of the insulators of the upper phase V strings (with an included angle of 85° to 95°). In order to ensure that the lower bending arm is not deformed by tension, the design size is usually larger, which increases the cost of the tower. If the ultra-high voltage double-circuit compact tower with the same tower still uses this type of tower, the design size of the lower bending arm of the T-shaped tower will be significantly increased to ensure sufficient bearing capacity, and the ability to resist heavy loads such as strong winds and repeated ice poor. For this reason, in view of the load and conductor arrangement characteristics of UHV double-circuit compact towers on the same tower, further innovations are needed on the basis of existing tower structures to meet the needs of subsequent UHV project construction in my country.
发明内容 Contents of the invention
本发明的目的是:针对现有同塔双回紧凑型塔存在的设计尺寸较大,成本高,且抗大风、重覆冰等重荷载的能力较差,本发明提出一种用于特高压同塔双回紧凑型输电的新型塔型,该塔型在保证杆塔承载强度及电气绝缘强度的同时,优化了杆塔结构尺寸,可以降低特高压紧凑型线路建设成本。The purpose of the present invention is: in view of the large design size and high cost of the existing double-circuit compact tower with the same tower, and the poor ability to resist heavy loads such as strong winds and repeated ice, the present invention proposes a UHV A new tower type for double-circuit compact power transmission on the same tower. While ensuring the load-bearing strength and electrical insulation strength of the tower, this tower type optimizes the structural size of the tower, which can reduce the construction cost of UHV compact lines.
本发明的技术方案是:一种用于特高压同塔双回紧凑型输电线路的新型塔型,其由:上侧横担、V型绝缘子串、I型中直串、下相柔性绝缘子、下侧横担和塔身组成,其特征在于:The technical solution of the present invention is: a new type of tower for UHV same-tower double-circuit compact transmission line, which consists of: upper side cross arm, V-shaped insulator string, I-type straight string, lower phase flexible insulator, Composed of the lower cross arm and the tower body, it is characterized in that:
1)上层横担和下层横担之间挂装两回6相特高压等级导线;1) Two circuits of 6-phase UHV grade conductors are hung between the upper cross-arm and the lower cross-arm;
2)上侧两相导线悬挂于同一横担上,且该横担无侧边曲臂;2) The two-phase wires on the upper side are suspended on the same cross arm, and the cross arm has no side crank arm;
3)下相导线由上、下绝缘子从相反方向施加拉力固定;3) The lower phase wire is fixed by pulling force applied from opposite directions by the upper and lower insulators;
4)固定下相导线的下侧绝缘子采用了柔性绝缘子,既使导线有一定弹性活动空间,又控制了导线的横向位移。4) The lower insulator for fixing the lower phase wire adopts a flexible insulator, which not only makes the wire have a certain elastic space, but also controls the lateral displacement of the wire.
本发明的有益效果是:与常规T型塔结构相比,本发明的新型塔型结构去除了下弯曲臂,避免了下弯曲臂在重荷载条件下弯曲变形,甚至断裂的可能;下侧增加了固定下相导线的横担,虽然一定程度上增加了塔材用量,但由于该横担主要起限制导线在水平方向及向上的活动范围,荷载较小,所以设计结构尺寸也较小;另外,固定下相导线的下侧绝缘子采用了柔性绝缘子,既使导线有一定弹性活动空间,又控制了导线的横向位移。由此,该塔型根据特高压双回紧凑型线路特点,综合考虑了特高压紧凑型三相导线排列方式、杆塔的体积、重荷载下杆塔的安全性等问题,较已有双回紧凑型杆塔型在上侧横梁结构和下相导线串型方面均有创新。The beneficial effects of the present invention are: compared with the conventional T-shaped tower structure, the novel tower structure of the present invention removes the lower bending arm, which avoids the possibility of the lower bending arm being bent, deformed or even broken under heavy load conditions; the lower side increases In order to fix the cross arm of the lower phase conductor, although the amount of tower material is increased to a certain extent, because the cross arm mainly limits the range of movement of the conductor in the horizontal direction and upward, and the load is small, the design structure size is also small; in addition , The lower side insulator that fixes the lower phase wire adopts a flexible insulator, which not only makes the wire have a certain elastic space, but also controls the lateral displacement of the wire. Therefore, according to the characteristics of the ultra-high voltage double-circuit compact line, the tower type comprehensively considers the arrangement of the UHV compact three-phase conductors, the volume of the tower, and the safety of the tower under heavy loads. Compared with the existing double-circuit compact The tower type has innovations in the upper side beam structure and the lower phase wire string type.
附图说明 Description of drawings
图1是现有技术中的双回紧凑型T型塔型的结构示意图。Fig. 1 is a structural schematic diagram of a double-circuit compact T-shaped tower in the prior art.
图2是本发明实施例的用于特高压同塔双回紧凑型输电的新型塔型的结构示意图。Fig. 2 is a schematic structural diagram of a new type of tower for UHV same-tower double-circuit compact power transmission according to an embodiment of the present invention.
具体实施方式 Detailed ways
以下结合附图和实施例对本发明做进一步的说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
图1中的标记说明:1-横梁,2-下弯曲背,3-塔身,4-上相v串,5-下相v串。Notes in Figure 1: 1-beam, 2-lower curved back, 3-tower body, 4-upper-phase v-string, 5-lower-phase v-string.
图2中的标记说明:6-上侧横担,7-v型绝缘子串,8-I型中直串,9-下相柔性绝缘子,10-下侧横担,11-塔身。Marking description in Figure 2: 6-upper side cross arm, 7-V-type insulator string, 8-I type medium straight string, 9-lower phase flexible insulator, 10-lower side cross arm, 11-tower body.
本发明实施例的新型塔型结构设计方案,如图2所示。该种塔型选用材料为角钢。杆塔两侧上下两层横担之间分别悬挂一回(A、B、C三相)导线,呈倒三角分布。杆塔分上下两层横担,上侧横担6悬挂两相导线V型绝缘子串7及下相导线I型中直串8,下侧横担10通过倒V形串固定下相导线,以减轻I型中直串导线横向摆动幅度大,以及垂直方向脱冰跳跃问题。与常规双回紧凑型T型塔相比,悬挂上相导线的横担取消了侧边下弯曲臂,避免了侧弯曲臂容易过载弯曲变形的问题,横担稳定性显著增强。固定下相导线的下相柔性绝缘子9采用了柔性绝缘子,使导线有一定弹性活动空间,又控制了导线的横向摆动幅度。The novel tower structure design scheme of the embodiment of the present invention is shown in FIG. 2 . The material of this tower type is angle steel. A round of (A, B, C three-phase) conductors are suspended between the upper and lower layers of cross arms on both sides of the tower, in an inverted triangle distribution. The pole tower is divided into upper and lower layers of cross arms. The upper cross arm 6 hangs V-shaped insulator strings 7 of two-phase conductors and I-type
与常规T型塔结构相比,该种新型塔型结构去除了下弯曲臂,避免了下弯曲臂在重荷载条件下弯曲变形,甚至断裂的可能。下侧增加了固定下相导线的横担,虽然一定程度上增加了塔材用量,但由于该横担主要起限制导线在水平方向及向上的活动范围,荷载较小,所以设计结构尺寸也较小。Compared with the conventional T-shaped tower structure, the new tower structure removes the lower bending arm, which avoids the possibility of the lower bending arm being bent, deformed or even broken under heavy load conditions. A cross arm for fixing the lower phase conductor is added on the lower side. Although the amount of tower material is increased to a certain extent, because the cross arm mainly limits the range of movement of the conductor in the horizontal direction and upward, and the load is small, the design structure size is also relatively small. Small.
所以,该塔型根据特高压双回紧凑型线路特点,综合考虑了特高压紧凑型三相导线排列方式、杆塔的体积、重荷载下杆塔的安全性等问题,较已有双回紧凑型杆塔型在上侧横梁结构和下相导线串型方面均有创新。Therefore, according to the characteristics of the UHV double-circuit compact line, this tower type comprehensively considers the arrangement of the UHV compact three-phase conductors, the volume of the tower, and the safety of the tower under heavy loads. Compared with the existing double-circuit compact tower The model has innovations in the structure of the upper beam and the string type of the lower phase wire.
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WO2014012345A1 (en) * | 2012-07-19 | 2014-01-23 | 安徽华电工程咨询设计有限公司 | "i-j-i" serial type novel power transmission line tower |
CN103046794A (en) * | 2012-12-27 | 2013-04-17 | 国核电力规划设计研究院 | Ultrahigh-voltage direct current crank arm tangent tower |
CN105133909A (en) * | 2015-09-29 | 2015-12-09 | 中国能源建设集团湖南省电力设计院有限公司 | Uplift-resistant linear tower in mountain area |
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CN106121340A (en) * | 2016-07-01 | 2016-11-16 | 国家电网公司 | A kind of big " V " formula single loop compact type tower window construction |
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