CN206349727U - Flexible arrester wires for high pressure overhead power line straight line pole - Google Patents

Flexible arrester wires for high pressure overhead power line straight line pole Download PDF

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Publication number
CN206349727U
CN206349727U CN201621437576.5U CN201621437576U CN206349727U CN 206349727 U CN206349727 U CN 206349727U CN 201621437576 U CN201621437576 U CN 201621437576U CN 206349727 U CN206349727 U CN 206349727U
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China
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flexible
insulator
gold utensil
tower
arrester wires
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Inventor
谢文
褚忠凯
李俊
殷飞
胡亚芳
张力
张瑚
黄欲成
李健
刘文勋
吕健双
柏晓路
吴高波
周魁
张冯硕
林芳
岳浩
向宇
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State Grid Corp of China SGCC
China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Economic and Technological Research Institute of State Grid Xinjiang Electric Power Co Ltd
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State Grid Corp of China SGCC
China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Economic and Technological Research Institute of State Grid Xinjiang Electric Power Co Ltd
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Abstract

The utility model discloses a kind of flexible arrester wires for high pressure overhead power line straight line pole, it is related to a kind of structure of flexible arrester wires.It includes arrester wires cable body, and the arrester wires cable body extends gold utensil, the flexible compound insulator of first band full skirt, the flexible compound insulator without full skirt, the second flexible compound insulator with full skirt, the first connection gold utensil, drag-line, the second connection gold utensil, spring and the 3rd connection gold utensil by the connection tower being sequentially connected from top to bottom and constituted.The utility model avoids the wire occurred in conventional engineering to the windage yaw discharge problem of shaft tower there is provided transmission line safety reliability, while can reduce the regional power transmission line corridor width of strong wind, with good practical value.

Description

Flexible arrester wires for high pressure overhead power line straight line pole
Technical field
The utility model is related to a kind of structure of flexible arrester wires, specifically a kind of to be used for high pressure overhead power line The flexible arrester wires of straight line pole.
Background technology
Wine glass-shaped or cathead structure, side wire are used China spy/single time of EHV transmission lines road straight line pole more It is use I type insulator chains more.Under the conditions of extreme wind, above-mentioned existing I types insulator chain easily shifts, and then makes existing Spy/EHV transmission lines road straight line pole easily influenceed by extreme weather so that spy/EHV transmission lines road Side phase conductor windage yaw discharge accident is in trend occurred frequently.
In power network, suspension insulator usage amount is very big, its wind load work under windage yaw size to transmission line of electricity Safe operation influence is very big.Overhead transmission line be constitute power network pith, it measure it is how wide, be distributed in spacious field, Mountain valley hills, area crisscrossed by waterways.Overhead transmission line is main by shaft tower (electric pole and steel tower), wire, ground wire, insulator and gold utensil etc. Composition.When having transverse horizontal wind load or electric wire athwart ship force is acted on suspension insulator, suspension insulator Lateral drift will be produced.This deflection may make the live part of suspension insulator lower end close to shaft tower component, work as electrical body During from being less than desired the air gap with a distance from shaft tower, then can occur windage yaw electric discharge phenomena, so as to cause energy loss and power failure Etc. failure.
Because overhead transmission line is exposed among air throughout the year, directly by weathers such as high wind, icing, suddenly cold and hots Change and strong-electromagnetic field, strong mechanical force, the extraneous influence for corroding the environmental condition such as serious, be easily caused in circuit the damage of wire and It is stranded;Produce loose contact because of reasons such as oxidation, corrosion and caused by conductor joint heating;One mutually breaks;Windage yaw breaking;Insulator Pollution flashover, rain dodge etc. potential safety hazard, bring influence to power network safety operation.The windage yaw discharge of wherein suspension insulator is The class more protruded in electric network fault in recent years.Illustrate according to pertinent literature, between 5 years 1999~2003 years, state's net system is more than 110kV circuit occurs windage yaw and discharged more than 260 altogether, and wherein 500kV circuits windage yaw is discharged 33, is related to Jiangsu, Zhejiang, peace The provinces, cities and regions such as emblem, Hubei, Henan, Shandong, Shanxi, Beijing, Hebei, the Inner Mongol, Heilungkiang, Liaoning.Since 2004,500kV Circuit windage yaw electric discharge showed increased, just has 21 1~July, wherein 19 are tangent tower windage yaw discharge, being related to region includes river The areas such as south, Jiangsu, Shanxi, Shandong, Hunan, Hubei, Beijing.Meanwhile, the 500kV circuits of Southern Power Grid Company also occur repeatedly Windage yaw discharge accident;Only-imperial slope 110kV circuits in the field of Sanya naval force and Lin Wang-dragon slope 110kV circuits, occur repeatedly Windage yaw line tripping fault.Reclosing is difficult success after being discharged due to circuit because of windage yaw, has a strong impact on and threaten network system Safe operation, while causing huge economic loss.Such as at 4 points in August in 2013 afternoon (U.S.'s local time) on the 14th, USA New York City Manhattan occurrence of large-area first has a power failure, and then has influence on eastern United States and Canadian some areas, causes industrial production, business Industry activity and communications and transportation paralyse.In view of the importance of ultra-high/extra-high voltage transmission line of electricity, to ensure the peace of ultra-high-tension power transmission line Row for the national games, furthers investigate the inclined measure of ultra-high/extra-high voltage power transmission line wind, and the reliability and economy for improving transmission line of electricity are very It is necessary.
With the raising of ultra-high/extra-high voltage line voltage distribution grade, insulator chain length increases therewith, right using V-type insulator chain Tangent tower cross-arm and anchor support wire jumper stent length propose very high requirement, cause the increase of shaft tower tower weight;And use routine I types During insulator chain, cross arm of tower length causes line level spacing to increase mainly by windage yaw clearance control, width of corridor increase, Fail to have compared with V-type string using cross-arm length during conventional I types insulator chain and significantly reduce, advantage is not obvious, while adding windage yaw The windage yaw of flashover.
In recent years, because windage yaw discharge frequently occurs, in high situation.To build stronger power network, transmission of electricity Overhead line structures wind-deviation optimizing research is extremely urgent.
Therefore, it is necessary to be analyzed and researched to the inclined technology of ultra-high/extra-high voltage power transmission line wind, it is proposed that high-tension line The technical thought of wind-deviation design, reduces electric network fault rate, improves circuit wind-deviation reliability and security, is social production life Steady smoothly carry out living provides powerful guarantee.
At present, prior art is generally solved above-mentioned side phase conductor windage yaw discharge using one kind in the following two kinds mode and asked Topic:The first is using increase wire cross-arm length or uses V-type insulator chain, and second is to use to install windproof bracing wire additional or add Fill the measure of supports insulative.But, transmission line of electricity cost can be significantly increased for the first above-mentioned technical scheme presence and corridor is wide The problem of spending.Above-mentioned second way presence can make wire and gold utensil limitation of activity, under the influence of long-term wind shake, wire and gold utensil It is movable easy by fatigue rupture, therefore, there is engineering allowed band potential safety hazard to circuit operation using the above-mentioned second way.
Utility model content
The purpose of this utility model is to provide for a kind of flexible obstruction for high pressure overhead power line straight line pole Rope, solve current existing high pressure overhead power line straight line pole is easily influenceed by extreme weather, so that high voltage overhead is defeated The side phase conductor windage yaw discharge accident of electric line is in trend occurred frequently.
To achieve these goals, the technical solution of the utility model is:For spy/EHV transmission lines road straight line The flexible arrester wires of shaft tower, including arrester wires cable body, it is characterised in that:The arrester wires cable body by being sequentially connected from top to bottom Join tower extension gold utensil, the flexible compound insulator of first band full skirt, the flexible compound insulator without full skirt, second with the soft of full skirt Property composite insulator, the first connection gold utensil, drag-line, the second connection gold utensil, spring and the 3rd connection gold utensil constitute.
The utility model is mainly used in ultra-high/extra-high voltage transmission line of electricity, and the utility model avoids what is occurred in conventional engineering Wire to the windage yaw discharge problem of shaft tower there is provided transmission line safety reliability, while the regional transmission line of electricity of strong wind can be reduced Width of corridor, with good practical value.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of flexible arrester wires.
Fig. 3 is force analysis schematic diagram of the present utility model.
Fig. 4 is force analysis schematic diagram of the present utility model.
1- tower bodies in figure, 2- wire cross-arms, 3- flexibility arrester wires, 31- connection tower extension gold utensils, flexibilities of the 32- with full skirt is answered Insulator is closed, flexible compound insulators of the 33- without full skirt, flexible compound insulators of the 34- second with full skirt, 35- first is connected Gold utensil, 36- drag-lines, the connection gold utensils of 37- second, 38- springs, the connection gold utensils of 39- the 3rd.
Embodiment
Describe performance of the present utility model in detail below in conjunction with the accompanying drawings, but they are not constituted to of the present utility model Limit, it is only for example.Make advantage of the present utility model more clear by explanation simultaneously and be readily appreciated that.
Understood refering to accompanying drawing:For the flexible arrester wires of spy/EHV transmission lines road straight line pole, including flexible resistance Rope 3 is blocked, the flexible arrester wires 3 is by the connection tower extension gold utensil 31 being sequentially connected from top to bottom, the flexible compound of first band full skirt Insulator 32, flexible compound insulator 34 of the flexible compound insulator 33, second with full skirt without full skirt, the first connection gold utensil 35th, drag-line 36, the second connection gold utensil 37, the connection gold utensil 39 of spring 38 and the 3rd.
During real work, the utility model is mounted on power transmission line wind side spin tower, power transmission line wind side spin Tower includes tower body 1, and the top two ends of tower body 1 are respectively connected with wire cross-arm 2, vacant end end and the tower body 1 of each wire cross-arm 2 Middle part between be all connected with the flexible arrester wires 3, the vacant end end of the tower extension gold utensil 31 and wire cross-arm 2 connects Connect, the 3rd connection gold utensil 39 is connected with the middle part of tower body 1.
During real work, construction procedure of the present utility model is as follows:
1st, according to Practical Project condition, tower-pole planning and shaft tower use condition are determined, the Practical Project condition includes permitting Perhaps horizontal span, vertical span, Vertical factor, the corner number of degrees, height above sea level, meteorological condition, landform, ground wire parameter and actual ranking Situation;
Specially:Shaft tower is determined according to the height above sea level of engineering, meteorological condition, landform, ground wire parameter, actual ranking situation etc. Planning and shaft tower use condition.For example, within height above sea level 1500m, design wind speed 31m/s, wire is using 6 division LGJ-400/50's Single loop circuit, level land landform, according to technical economic analysis, engineering experience and the modular design of ranking achievement, wherein 1 type straight line The use condition of tower is horizontal span 450m, and high 48m etc. is exhaled in vertical span 600m, 0 ° of the corner number of degrees, calculating.
2nd, required by Insulation Coordination, determine that wire suspension string is long, the Insulation Coordination requires to include selection and meets electric The insulator of insulating requirements and tower head the air gap.
During real work, it is specially:
(1) insulation configuration principle (the appropriate insulator pattern of selection)
It should be noted that the following aspects during appropriate insulator pattern is selected:
1) the perspective of insulation configuration principle is focused on, insulation configuration will not only consider current filthy situation, also combine Local economy, environmental development situation, rationally determine insulation configuration principle.
2) under present condition, for newly-built 500kV (containing 330kV) and 0 grade in principle of above project of transmitting and converting electricity, I grade of dirt One-level insulation configuration is improved in dirty area, II grade, III grade, IV grade of filthy area configured according to the upper limit.
(2) gradation for surface pollution is divided
A dirt Division principles
According to GB/T16434-1996《Level and external insulation choosing are distinguished in high-tension overhead line and power plant, electric substation's environment dirt Select standard》And Q/GDW152-2006《Level and external insulation selection standard are distinguished in power system dirt》Regulation perform.
B dirt Divisions
According to the dirty source investigation of fertilizer making by sludge and scene, determine along circuit that filthy area grade is a in table 1, b, c, d, in e Which kind of.
The retting-flax wastewater of each gradation for surface pollution of table 1
Dirty area's retting-flax wastewater capping values at different levels during engineering insulation configuration, such as:D Ji Wu areas unify retting-flax wastewater and are defined as 50.4mm/kV, e Ji Wu areas unify retting-flax wastewater and are defined as 59.8mm/kV.
(3) insulator is selected
According to transmission line of electricity external insulation design principle, the selection of insulator should meet power-frequency voltage, switching overvoltage simultaneously Required with the aspect of lightning surge three.The dirty pressure-resistant spy depended primarily on due to the selection of line insulation sub-pieces number under power-frequency voltage Property, therefore, sub-pieces number usually is selected by pollution performance, then check operation and lightning impulse performance.
For composite insulator selection, selected generally according to porcelain insulator after piece number, according still further to regulatory requirements, it is determined that The creep age distance and structure height of composite insulator.
Press《110kV~750kV overhead transmission line design specifications》(GB50545-2010) that recommends presses leakage ratio away from method Sub-pieces number is calculated, and carries out height above sea level amendment.
(1) circuit should meet following formula requirement per insulator string piece number determined by power-frequency voltage creep age distance:
In formula:
M-per insulator string piece number;
Um- system nominal voltage, kV;
λ-retting-flax wastewater, cm/kV;
The geometry creep age distance of the suspension insulators of L0-every, cm;
The coefficient of efficiency of Ke-insulator creep age distance, is mainly carried by various insulator creep age distances in experiment and operation High filthy pressure-resistant validity is determined.
(2) high altitude localities, as height above sea level rise or air pressure are reduced, the flashover voltage of contaminated insulator is decreased.It is high The piece number of Altitude Regions suspension insulator, is preferably calculated as follows:
In formula:
nH--- high altitude localities piece number needed for per insulator string;
H --- height above sea level (km);
m1--- characteristic index, it reflects influence degree of the air pressure for pollution flashover voltage, determined by experiment.
According to d, e Ji Wu areas consider that corresponding 750kV electric transmission line isolators piece number is as shown in table 2:
Disc type sub-pieces number is configured after the height above sea level amendment of table 2
B checks sub-pieces number by switching overvoltage
Such as:Positive polarity switching impulse of the line conductor to shaft tower the air gap after 750kV sides phase conductor (using I strings) windage yaw The discharge voltage U of voltage wave 50%50%Following formula requirement should be met:
U50%≥K3US=1.27 × 1.8 × 800/ √ 3/2=1493kV
Insulation Coordination coefficient-k3=1.27, Us is taken in calculating --- switching overvoltage (kV);
It is computed, the discharge voltage U of positive polarity operating impulse voltage ripple 50%50For 1493kV.
To the discharge voltage U of High aititude positive polarity operating impulse voltage ripple 50%50It is modified, as shown in table 3.
The discharge voltage U of 3 High aititude positive polarity operating impulse voltage ripple of table 50%50
Height above sea level 1000m 2000m
50% discharge voltage 1587 1688
According to conclusion both at home and abroad about research unit, 1000~2000m altitude operations surge voltages ripple 50% discharges electricity Corresponding insulator chain length is pressed between 4-5m, much smaller than the corresponding structure height of sub-pieces number by dirty pressure-resistant selection, is pressed The sub-pieces number determined according to power frequency retting-flax wastewater meets the requirement in the case of switching overvoltage.
C checks sub-pieces by lightning surge
Above-mentioned configured most short insulator chain insulated lengths consider that thunder discharge voltage is 3600~3800kV.Work as line Road span be 450m, shaft tower exhale height be called 48m, earth-wire protection angle be 10 °, impulse earthed resistance is 7~15 Ω and year is flat When equal thunderstorm day is 40 days, resistance to thunder level during lightning stroke rate is about 178~222kA, and tripping rate with lightning strike is about 0.101~ 0.168 time/100kmy, the requirement of lightning surge can be met.
D recommends the insulator used
Dirty area is according to d, e grades of filthy areas, according to disk insulator piece number selection result, according to《110kV~750kV is maked somebody a mere figurehead Transmission Line Design specification》, Chong Wu areas composite insulator creep age distance be no less than the 3/4 of the minimum required value of dish-type insulator and Not less than 2.8cm/kV, structure height is not less than 80%.E Ji Wu areas composite insulator is with reference to d Ji Wu areas composite insulation subparameter Tune is climbed, and does not increase structure height.
According to equipping rules, suspension insulator composite insulation subparameter may be selected as indicated at 4:
The suspension insulator of table 4 (synthesis) parameter list
(4) determination of tower head the air gap
According to《110kV~750kV overhead transmission line design specifications》, and with reference to the design experiences of other 750kV circuits, 750kV single back lines the air gap is as shown in table 5.
Table 5 recommends the air gap (m)
According to factors, pendency such as insulator strength, connection number, the requirement of gold utensil safety coefficient, the connections of shaft tower hanging point pattern, gold utensil Insulator chain assorted golden tool length, so that comprehensive determine suspension insulator length.
By above-mentioned analysis, the flexible compound insulator with full skirt is consistent with the parameter of table 4, and structure height is The air gap under 7150mm, each operating mode is consistent with table 5.
C) line corridor:
Determination to the width of corridor of 750kV transmission lines of electricity, mainly considers following factor:
1) horizontal range that wire is projected to house should be not less than 6m, i.e., must be torn open away from all houses within the wire 6m of side Move;
2) it is strong to the maximum non-distortion electric field of 1.5m eminences in ground where house when calm away from the house beyond the wire 6m of side Degree should cannot be greater than 4kV/m, ensure clearance 11.0m during maximum windage yaw, otherwise all should remove;
Generally according to side wire+safe distance (such as:500kV sides wire 5m, 750kV sides wire 6m, 1000kV sides wire 7m) as the bounds of line corridor width.
4th, required according to electric clearance, windage yaw blocks angle demand etc. and determines tower window size;
By setting maximum angle of wind deflection limitation (θ 1), insulator electric insulation length requirement is hindered according to flexible blocking, with reference to bar Tower is arranged, determines check cable entire length, and then determine tower head size.
Restraint spring is designed in check cable, it is ensured that wire in extreme wind speeds, arresting gear by restraint spring action and Flexible arresting net (rope) bending, discharges insulator chain windage yaw load, and the maximum angle of wind deflection of insulator chain is limited within θ 1.
Because wind deflection preventive controls the maximum angle of wind deflection of insulator chain within θ 1, conductor spacing is by following condition control System:
1st, lightning surge gap;
2nd, switching overvoltage gap;
3rd, livewire work gap;
4th, the power-frequency voltage gap (the application particular/special requirement) in the case of the windage yaw of θ 1.
As described in check cable limit force analysis schematic diagram in Fig. 2, Fig. 3, Fig. 4, according to parallelogram law, check cable Static strength has:F5=F3/sin (θ 3- θ 4)
θ 3 is that check cable blocks extreme angles, and concrete numerical value is set as needed, such as 35 °;
θ 4 is the extreme angles of check cable bottom and vertical line.
Wherein, θ 4=θ 1- θ 5
θ 5=arccos ((x2+c2-L2)/2/x/c)
C=(x2+L2-2*x*L*cos (θ 3- θ 1)) 0.5
X is the initial total length of arresting gear;
L is that insulator chain is long.
F4=F5*sin (θ 5+ θ 3- θ 1)
5th, required according to lightning protection, ground wire horizontal-shift etc., determine earth wire support length and height;
6th, according to parameters such as tower head size, Insulation Coordination requirement, suspension string length, calculate and determine check cable mechanical strength and each Building block length and parameter.
The key of flexible compound check cable is that flexibility blocks composite.Flexible inter-phase spacer used for transmission line is compound exhausted Edge has preferable flexural property and electric property, and flexibility blocks composite can be with flexible inter-phase spacer compound inslation Developed based on son.
To ensure circuit operation safety and check cable service life, wire should not be collided under common wind conditions and blocked Rope, the probability that can set wire collision check cable is less than 20%.For example:It is computed, with nearby Urumqi strong wind distribution character Exemplified by, the probability that more than 21.3m/s wind speed occurs is less than 20%, and it is 39.6 degree to calculate obtained insulator chain angle of oscillation.According to The angle of the structure and blast velocity control value of 7A5-ZB1 shaft towers, check cable and vertical direction is set to 40.4 degree, and check cable total length is true It is set to 25.6m.
Arresting gear is selected using 2 check cables, and check cable spacing is defined as 1600mm according to tower structure.One end hanging point It is suspended near insulator chain hanging point, other end hanging point is suspended at tower body.
To ensure the intensity and insulating properties of flexible composite, the sub- plug global formation of flexible insulation.Layer structure is adopted With three stage structure, two ends use band full skirt flexible compound insulator to increase creep age distance, it is ensured that Insulation Coordination requirement.It is middle Used with wire position of collision without umbrella skirt construction.
Required according to insulation configuration, from from the point of view of composite and wire collision, flexible compound insulator is contacted with cross-arm Point and flexible insulation are required to consider band full skirt composite insulator with tower body direction drag-line, and dry arcing distance is considered by 6600mm.
Dry arcing distance of the two ends with full skirt insulator is 6600mm, and structure height is 7150mm.
It is 500mm to consider protection gold utensil radius, and contact length is less than 785mm after check cable bending, while considering check cable Installation site wire has a down dip 100-300mm rich length, to ensure that the flexible composite of full skirt is not installed in wire collision, no Band full skirt flexible compound insulator length is defined as being more than 1500mm.
In summary, flexible composite length can be considered by 15800mm.
I types suspension insulator is by 8603mm considerations, the length 8257mm of hanging point to split conductor center, with respect to check cable Installation site (i.e. away from suspension string center line about 800mm) wire has a down dip and considered by 100-300mm.To ensure wire collision without full skirt In the middle part of flexible composite, the gold utensil length with cross-arm coupling part is 450mm.
Drag-line rated load should be at least above equal to the specified mechanical load of flexible insulation.
Increase the adjustable gold utensil such as DB hanging plates and PT hanging plates in connection gold utensil, flexible check cable length is adjusted flexibly with local.
According to the structure of 7A5-ZB1 shaft towers and blast velocity control value, 40.4 degree are set at the beginning of the angle of check cable and vertical direction, Total length is primarily determined that as 25.6m.
7th, shaft tower load condition is calculated, tower structure design is completed.
The load acted on shaft tower can be divided into permanent load by its property, can be with time dependent loading and special load.
First, permanent load:Including shaft tower from gravity, electric wire, insulator, the weight of the gravity of gold utensil and other fixing equipments Power.
2nd, variable load:Including the ice load on wind load, electric wire and insulator, the tension force of electric wire and bracing wire and apply Temporary load(ing) when work is overhauled, secondary load caused by malformation and various vibration dynamic loads.
3rd, special load:Including the load caused by electric wire broken string and by seismic load, and in mountain area Or extreme terrain location, the load such as the unbalanced tensile force caused by uneven icing.
They can be resolved into the lateral load acted on shaft tower, indulged by the every load of appeal according to needs are calculated To load and vertical load.
Calculate shaft tower load to refer to act on the load on shaft tower under calculating DIFFERENT METEOROLOGICAL CONDITIONS and external condition, for true Material type selecting, composition, specification, connected mode of fixed pole tower part etc..
During real work, this new shaft tower is made up of flexible check cable and steel tower two parts.Flexible check cable by Lian Ta and Extend the parts such as gold utensil, flexible compound insulator, spring, drag-line and connection gold utensil composition.Steel tower tower head pattern can be according to wire The requirement such as phase spacing, electromagnetic environment, line corridor, is determined through technology and economy comparison.Check cable is by joining tower gold utensil respectively at horizontal stroke Load conducting wire hanging point is nearby connected with tower body.
Under the extreme meteorological condition of strong wind, allow angle because circuit windage yaw angle is physically limited in the limit by check cable Within degree, it is to avoid live part caused by strong wind to tower body flashover discharge accident, with improving line security reliability, reduction The beneficial effect of line corridor.
Wire cross-arm length and check cable layout angle need to according to the Practical Project strong wind regularity of distribution, electric clearance requirement, The wind speed etc. that blocks drafted requires matching design.According to parameters such as tower head size, Insulation Coordination requirement, suspension string length, calculate true Determine check cable mechanical strength and each composition part length and parameter.According to shaft tower load and check cable load, tower structure is completed Design.
Other unaccounted parts belong to prior art.

Claims (1)

1. for the flexible arrester wires of high pressure overhead power line straight line pole, including arrester wires cable body (3), it is characterised in that: The arrester wires cable body (3) by the connection tower that is sequentially connected from top to bottom extend gold utensil (31), first band full skirt flexible compound it is exhausted Edge (32), the flexible compound insulator (33) without full skirt, the second flexible compound insulator (34) with full skirt, the first connection gold Have (35), drag-line (36), the second connection gold utensil (37), spring (38) and the 3rd connection gold utensil (39) to constitute.
CN201621437576.5U 2016-11-30 2016-12-26 Flexible arrester wires for high pressure overhead power line straight line pole Active CN206349727U (en)

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Application Number Priority Date Filing Date Title
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CN2016212970003 2016-11-30

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Publication Number Publication Date
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