CN201789258U

CN201789258U - Composite tower with inside vertical ground down lead

Info

Publication number: CN201789258U
Application number: CN201020260648XU
Authority: CN
Inventors: 李志军; 李汉明; 刘庭; 魏前虎; 霍锋; 詹铭; 戴敏; 邓世聪; 刘凯; 曹宁; 邬雄; 张育华; 谷定燮; 周伟才; 周沛洪; 李振强; 娄颖; 何慧雯
Original assignee: State Grid Wuhan High Voltage Research Institute; Shenzhen Power Supply Bureau guangdong Grid Co ltd
Current assignee: State Grid Wuhan High Voltage Research Institute; Shenzhen Power Supply Bureau guangdong Grid Co ltd; State Grid Electric Power Research Institute
Priority date: 2009-09-08
Filing date: 2010-07-16
Publication date: 2011-04-06
Anticipated expiration: 2020-07-16
Also published as: CN102064509B; CN102064509A; CN101692545A

Abstract

The utility model relates to a composite tower with an inside vertical ground down lead. A ground wire cross arm in the tower is made of metal materials, an ground down lead upper metal cross arm in certain length is led from the center of the ground cross arm along a lead direction, the ground down lead is led from the tail end of the upper metal cross arm vertically, is connected to the tower through a ground down lead lower metal cross arm at a position distant from the lower side of bottom-phase leads by certain distance and then is grounded downwards along the tower body, and if the lower portion of the tower adopts steel pipes, the ground down lead can be connected to the steel pipes so as to be grounded. By the aid of the additional ground down lead upper metal cross arm and the additional ground down lead lower metal cross arm, the ground down lead at the head of the tower is spaced from the body of the composite tower by a certain distance. By the aid of the composite tower with an inside vertical ground down lead, the power frequency pollution flashover resistance capacity of lines is enhanced, lightning surge insulating strength of the lines is strengthened, and composite insulators can not be burnt by flow current after lightning flashover. In addition, the composite tower with an inside vertical ground down lead is simple in structure and easy to be carried out.

Description

The composite material pole tower of inboard, upright down conductor

Technical field

The utility model relates to a kind of composite material pole tower of inboard, upright down conductor, belongs to technology of transmission of electricity application in the electric power system.

Background technology

Shaft tower is the visual plant of transmission line, and the characteristic of its materials used directly has influence on fail safe, economy and the reliability of circuit operation.Because steel have the strength-weight ratio height, easily process and advantage such as installation, adopt all steel material shaft tower both at home and abroad at present mostly.But also there are defectives such as quality big (steel density is higher), easy-to-rust in all steel shaft tower, so need drop into bigger man power and material in shaft tower construction transportation and aspect safeguarding.And along with the development of composite material production technology and manufacturing process thereof, characteristics such as that composite material has is in light weight, intensity is big, corrosion-resistant, high-low temperature resistant, excellent in durability and insulating properties are strong, make composite material pole tower have cost of transportation low (particularly in meagrely-populated mountain area), antifouling, advantage such as antiseptic property is good, good application prospects is arranged.Adopted composite material pole tower in a large number in Canada, U.S. some areas at present.When but Canada, the U.S. use composite material pole tower, do not consider the problem of lightning protection.Its main cause is that its circuit institute that adopts composite material pole tower is area with less lightning activities (owing to Canada, U.S. some areas are in winter throughout the year, these regional thunderstorm days are very little) through the area.In addition, it is the following electric pressure of 110kV mostly that Canada, the U.S. use the circuit of composite material pole tower, and these electric pressure systems are central point isolated neutral systems, and electric pressure is low, and lightning fault is little to the impact of system.

China's overhead line structures mainly adopt reinforcing bar to coagulate materials such as earth, timber, steel (110kv and above electric pressure circuit adopt full shaft tower just usually) at present, because composite material pole tower has comparatively outstanding advantage, composite material pole tower (mostly in 110kV and above electric pressure) is also prepared in a lot of areas to use by China.Because these areas exist: problems such as the input in circuit corridor are big, lightening activity is intensive, filth is serious, so China is when using composite material pole tower, its main purpose is to reduce transmit electricity width of corridor, lightning protection (referring to reduce the lightning fault rate) and antifouling (referring to reduce power frequency pollution flashover failure rate by increasing the pollution flashover creepage distance) etc.

Composite material pole tower is faced with the problem of lightning protection just, so need construction of line lightning conducter (because problem Canadian, the U.S. does not consider lightning protection when adopting composite material pole tower, thereby do not set up lightning conducter), and the thunder and lightning energy when discharging thunderbolt lightning conducter (also claim " ground wire ") or cat head, to improve the counterattack lightning withstand level of circuit, reduce the lightning fault rate of circuit, need composite material pole tower to pursue tower ground connection.

Therefore, the application of transmission line composite material pole tower exists the problem of ground connection under drawing, and (all steel shaft tower is because body of the tower is a metallic conductor, ground wire is just directly received the earth by body of the tower naturally, so do not have again the problem of ground connection under drawing), under drawing, its ground connection has multiple diverse ways, grounding down-leading method will directly have influence on the lightning protection effect of composite material pole tower, but also have influence on the antifouling of circuit and reduce the width of corridor etc. of transmitting electricity, so being it, the grounding down-leading method of composite material pole tower needs the key technology and the difficult point that at first solve in using.

Summary of the invention

In order to address the above problem, the utility model provides a kind of composite material pole tower of inboard, upright down conductor, this shaft tower can be given full play to the insulating effect of composite material pole tower body of the tower, makes composite material pole tower embody its value and advantage at aspects such as antifouling, lightning protection and burn-out proof composite insulators.

The technical solution of the utility model is: the composite material pole tower of inboard, upright down conductor, it is characterized in that: the ground wire cross-arm of head of mast adopts metal material, draw at the center of ground wire cross-arm one section certain-length along metal cross arm on the down conductor of lead direction, the end of metal cross arm vertically draws down conductor down on down conductor, this down conductor certain distance below following phase conductor is connected on the shaft tower by metal cross arm under the down conductor, last down conductor is along body of the tower ground connection, or when the body of the tower lower part was steel pipe, down conductor directly was connected in ground connection on the steel pipe by metal cross arm under the down conductor.

The composite material pole tower of aforesaid inboard, upright down conductor, it is characterized in that: draw symmetrically at the center of ground wire cross-arm two sections certain-lengths along metal cross arm on the down conductor of lead direction, vertically draw simultaneously following two down conductors symmetrically.

The composite material pole tower of aforesaid inboard, upright down conductor is characterized in that: the support component of down conductor and composite material pole tower is an insulating bar.

The beneficial effects of the utility model are:

(1) avoids down conductor short circuit composite material pole tower body of the tower, brought into play the insulating effect of composite material body of the tower, made lead creepage distance over the ground strengthen, strengthened the ability of its pollution flashover of anti-the power frequency;

(2) avoided the adverse effect of cross-arm gold utensil to the lightning impulse dielectric strength, guaranteed that thunder and lightning lead minimum air void distance is over the ground decided by the minimum range of lead to down conductor, thereby strengthened lead insulation distance over the ground, strengthened its anti-lightning impulse dielectric strength;

(3) avoided the burn problem of the power frequency continued flow behind the lightning flash over to composite insulator;

When (4) having avoided down conductor to move on the ground, to the inconvenience influence of life;

(5) features simple structure is easy to realize.

Description of drawings

Fig. 1 is the front view of the monolateral down conductor of the utility model embodiment.

Fig. 2 is the front view of the bilateral down conductor of the utility model embodiment.

Fig. 3 is the partial top view of the monolateral down conductor of the utility model embodiment.

Fig. 4 is the vertical view of the monolateral down conductor of the utility model embodiment.

Fig. 5 is the vertical view of the bilateral down conductor of the utility model embodiment.

Fig. 6 is the end view of the monolateral down conductor of the utility model embodiment.

Fig. 7 is the end view of the bilateral down conductor of the utility model embodiment.

Embodiment

Description of symbols among Fig. 1: 1-ground wire cross-arm, metal cross arm on the 2-down conductor, 3-down conductor, metal cross arm under the 4-down conductor, 5-supports insulative bar, 6-composite insulator, 7-cross-arm gold utensil, the body of the tower part of 8-tower head, the 9-ground wire, the last phase conductor of 10-, phase conductor among the 11-, phase conductor under the 12-, 13-body of the tower lower part.

Ground wire cross-arm 1 in the utility model adopts metal material, draws one section certain-length D at the center of ground wire cross-arm 1 ₁Along metal cross arm 2 on the down conductor of lead direction, the end of metal cross arm 2 vertically draws down down conductor 3 on this down conductor, this down conductor 3 is certain distance D below phase conductor 12 down ₂Be connected on the shaft tower by metal cross arm 4 under another down conductor.Increase on this down conductor metal cross arm 4 under the metal cross arm 2 and down conductor, can be grounded between the body of the tower part 8 of downlead 3 and tower head and separated certain distance D ₁, its objective is and avoided down conductor 3 short circuit bodies of the tower, brought into play the insulating effect of composite material pole tower body of the tower, make lead power frequency pollution flashover flashover path over the ground increase, thereby strengthened the ability of its pollution flashover of anti-the power frequency; In addition, in distance D ₁When enough big, (the impulse flashover path is the minimum air void distance of down conductor to lead, in Fig. 3 without cross-arm in the impulse flashover path

Or

Rather than among Fig. 3

Or

), thereby (adverse effect is meant when down conductor is close to the shaft tower outer wall also to have avoided the adverse effect of 7 pairs of lightning impulse dielectric strengths of cross-arm gold utensil, because the existence of cross-arm gold utensil 7 makes that lead is among Fig. 3 to the minimum air void distance of down conductor 3

Or

Section, this distance is less than among Fig. 3

Or

Be lead to the minimum air void of down conductor 3 apart from shortening, wherein lead to the minimum air void of down conductor 3 apart from having determined lead lightning impulse dielectric strength over the ground), strengthened the anti-lightning impulse dielectric strength of composite material pole tower; And because the burn problem of the power frequency continued flow behind the lightning flash over to composite insulator without cross-arm, also avoided in the impulse flashover path.

On the down conductor under metal cross arm 2 and the down conductor metal cross arm 4 also played the effect of the down conductor 3 under stay bolt vertically draws, make down conductor 3 under the effect of strong wind iso-stress, bigger flexural deformation can not take place, down conductor 3 should adopt higher, the on-deformable electric conductor of intensity, if in order further to guarantee down conductor 3 not flexural deformations, can add supports insulative bar 5 down conductor 3 and composite material pole tower support are come, as shown in fig. 1.

Draw the metal cross arm along the lead direction of two sections certain-lengths symmetrically at the center of ground wire cross-arm 1, two down conductors under vertically drawing symmetrically can strengthen the shunting action of down conductor, as shown in Figure 2 like this.

Down conductor 3 under vertically drawing is connected under the down conductor after the metal cross arm 4, down conductor 3 inserts the earth along body of the tower, if being tower head, composite material pole tower uses composite material and the remaining part steel pipe, as long as metal cross arm 4 is the steel pipes that are fixed on remaining part under the down conductor, just can directly insert the earth by the steel pipe body of the tower, thereby when having avoided down conductor 3 directly vertically to move on the ground, to the inconvenience influence of life.

Generally speaking, this composite material pole tower grounding down-leading formula structure intuitively, simply clear, be easy to realize.

Claims

1. the composite material pole tower of inboard, upright down conductor, it is characterized in that: the ground wire cross-arm of head of mast adopts metal material, draw at the center of ground wire cross-arm one section certain-length along metal cross arm on the down conductor of lead direction, the end of metal cross arm vertically draws down conductor down on down conductor, this down conductor certain distance below following phase conductor is connected on the shaft tower by metal cross arm under the down conductor, last down conductor is along body of the tower ground connection, or when the body of the tower lower part was steel pipe, down conductor directly was connected in ground connection on the steel pipe by metal cross arm under the down conductor.

2. the composite material pole tower of inboard, upright down conductor according to claim 1, it is characterized in that: draw symmetrically at the center of ground wire cross-arm two sections certain-lengths along metal cross arm on the down conductor of lead direction, vertically draw simultaneously following two down conductors symmetrically.

3. the composite material pole tower of inboard, upright down conductor according to claim 1 is characterized in that: the support component of down conductor and composite material pole tower is an insulating bar.