CN102507123B - Test method used for transmission line ice coating disconnection - Google Patents
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- CN102507123B CN102507123B CN201110300872.6A CN201110300872A CN102507123B CN 102507123 B CN102507123 B CN 102507123B CN 201110300872 A CN201110300872 A CN 201110300872A CN 102507123 B CN102507123 B CN 102507123B
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Abstract
The invention provides a test method used for transmission line ice coating disconnection. In the method, the influences of the factors such as the wire model, the ice coating thickness and wire initial tension and the like are comprehensively considered, and the method has better adaptability and higher accuracy. The test method provided by the invention comprises the following steps of constructing a serial three-gear four-rod three-line model; simulating wire ice coating by using a method of a heavy steel wire rope adopting binding and ice coating and the like; installing a disconnection trip mechanism at a side gear midspan position; testing a transverse displacement decrement curve and a non-disconnection gear disconnection tension travel time curve of an intermediate gear midspan point in each working condition on the basis that test working conditions are designed in accordance with different wire models and ice coating thicknesses; and determining the ice coating wire damping ratio and a wire tension dynamic shock factor to finally provide a basis for the tower disconnection load value of an ice coating zone. The test method comprises the following steps: designing a disconnection test line section, calculating the weight of ice coating, carrying out damping identification on the ice coating wire and testing and analyzing the disconnection tension. The method provided by the invention has the advantages of simple theory, reliable computational result, and provides a basis for the construction of a transmission line.
Description
Technical field
The invention belongs to the conductor cord disconnection load test field in electric power line pole tower load test, specifically relate to a kind of test method used for transmission line ice coating disconnection.
Background technology
Icing, wave and all may cause transmission line wire with meteorological disasters such as high wind or ground wire breaks.Winter aerial condutor and shaft tower be easy to icing, serious icing and the conductor galloping caused because of icing, be cause ultra-high-tension power transmission line to break and fall the main cause of tower.Conscientiously must investigate an important parameter of calculating when ice covering thickness is design aerial high-voltage power transmission line, calculate the stress of aerial high-voltage wire when different ice covering thickness, for ensureing that the safe operation tool of transmission line of electricity is of great significance.
All occur to make because of wire icing in the many areas of China the loading increase of transmission line of electricity to cause the accidents such as flashover, broken string, bar (tower), cause huge economic loss to society.Such as, in January, 2008, heavy snow was fallen over a large area in all parts of the country, and southern number is economized transmission line of electricity and met with ice disaster rarely seen in the history.Strong wind, sleet, ice and snow, make the serious icing of transmission pressure, many transmission lines of electricity fall string, broken string, fall the accidents such as tower.
Transmission line of electricity broken string can produce larger longitudinal unbalance tension force, transient impact can be caused to electric power line pole tower, the internal force of transmission tower and dynamic respond are obviously increased, causes broken string lever tower to collapse and even cause transmission line of electricity string to fall, have a strong impact on the safe operation of transmission line of electricity.Therefore, transmission line of electricity broken string load analysis and experimental study is studied always and the extensive concern of designer.
Article that in 2009 annual power industry Hi-pot tests and Electrical Measurement Technology seminar, Hu Deshan, Yuan Shun and Liu Ning deliver " force analysis during the serious icing of aerial condutor ", illustrate the technology of the static tension of ice coating wire, ice coating wire dynamic stress analysis calculates, on this basis, use simulation calculation software ANSYS Modling model, the stress of high hanging wire point place wire during calculating conductor galloping.For Transmission Line Design is provided fundamental basis.
(electrotechnics journal in " the wire dynamic tension that ice coating wire is waved characteristic and caused " literary composition that the people such as Wang Shaohua deliver, Vol25,1,2010, P159-166), establish the Three Degree Of Freedom physical model that ice coating wire is waved, adopt Fluent software to carry out numerical simulation to the aerodynamic parameter of ice coating wire, the dynamic analog that icing is waved that utilized Simulink emulation module to carry out on this basis, obtains the fundamental characteristics that ice coating wire is waved.Result shows: wave when reaching stable state, vertical direction and horizontal direction vibrational waveform are approximately monochromatic wave; Wave track approximate tiltedly oval; Wire Horizontal Tension, hitch point vertical tension force component variation amount is all along with throw amplitude value increase, span shortening, sag increase and increase; Single half-wave to wave the wire tension excursion caused maximum, the most easily make wire damage; The parity of waving half wave number has considerable influence to tension variation percentage.
And for example application number is CN200810042499.7, denomination of invention is the application for a patent for invention of " monitoring icing line wires ice covering thickness and the stressed method of tangent tower ", the stressing conditions of monitoring tangent tower while monitoring wire icing thickness, when steel tower unbalanced tensile force exceeds standard and alarm, to avoid the accident of falling tower occurs, ensure the security of circuit under icing condition.
Above-mentioned technology is technology or the method for actual detection wire icing thickness, and has and provide foundation to the construction of transmission pressure.
After Ice Disaster in Power Grids in 2008, in the design specification of new revision, change broken string operating mode into icing, wire breaking by breaking without ice.In addition, damping has considerable influence to broken string response attenuation process, does not test the damping of tower line system, mostly rule of thumb adopt an assumed value, have impact on the precision of conductor cord disconnection dynamical simulation analysis result when numerical analysis in experimental study in the past.For accurately determining dynamic characteristics and the broken string load of ice coating wire, it may be necessary and build continuous multi-gear power transmission line section, adopt the icing weight of ballasting method simulation different-thickness, carry out the conductor cord disconnection test of different conductor model, different ice covering thickness, test span centre point wire tension and span centre point lateral displacement time-histories under different operating mode, calculate the damping ratio in test wire section under different operating mode, determine the dynamic impact coefficient of different operating mode lower wire tension force, finally for Ice Area shaft tower broken string Load value provides foundation.
Summary of the invention
The object of the invention is to provide a kind of test method used for transmission line ice coating disconnection, for Ice Area shaft tower broken string Load value provides foundation; This method considers the impact of the factors such as wire type, ice covering thickness and wire initial tension, adds the impact of damping on broken string response attenuation process simultaneously, higher to the testing and analysis precision of ice coating wire broken string stress, has better adaptability.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of test method used for transmission line ice coating disconnection, its improvements are said method comprising the steps of:
1) broken string test wire section design:
Wire type, suspension string model are selected:
According to the actual span of transmission line of electricity actual design condition and test wire section and the discrepancy in elevation, Selection experiment wire type and suspension string model, after suspension string length will ensure conductor cord disconnection, suspension string and the wire distance to the ground of minimum point in swing process is greater than 0;
Steel pipe pole and basic engineering:
Using the controlled load case that the operating mode that breaks designs as steel tube rod structure, calculate steel pipe pole root bending moment when breaking, according to GB50545-2010110kV ~ 750kV overhead transmission line design specification design steel pipe pole and basis;
Conductor cord disconnection:
Manual unhook discharge mechanism is adopted to realize;
Broken string discharge mechanism, tension pick-up and displacement transducer are installed on each shelves wire;
2) icing simulation and icing Weight computation
Icing adopts the quality steel wire rope simulations such as binding;
Icing Weight computation formula is:
w＝900×πδ(d+δ) (1)
Wherein: w is the icing weight of conductor, and units/kg/m, δ is ice covering thickness, unit m, d diameter of wire, unit m;
Icing weight w according to conductor selects steel wire rope model;
3) ice coating wire original state setting
f
m＝gl
2/8T
0(2)
Wherein: f
mfor span centre point sag, unit m; G is conductor weight, unit N/m; L is wire span, unit m; T
0for wire minimum point Horizontal Tension, unit N;
4) ice coating wire damping identification
ξ＝δ
m/2πm (3)
δ
m≡ln(d
n/d
n+m) (4)
Wherein: ξ is ice coating wire damping ratio; δ
mfor the logarithmic decrement after conductor vibration m week; d
nand d
n+mfor span centre point n-th and n-th+m displacement peak value;
5) broken string tension test and analysis
Wire dynamic tension is directly measured by tension pick-up;
Wherein: described broken string discharge mechanism, tension pick-up and displacement transducer are installed on the span centre position of each shelves wire.
Wherein: described ice coating wire original state situation, suspension string vertical is in level ground.
Owing to have employed technique scheme, compared with prior art, beneficial effect of the present invention comprises:
1) simulation analysis precision improves
This method considers the impact of damping on broken string response attenuation process, tests, make conductor cord disconnection dynamical simulation analysis result more accurate to the damping of tower line system;
2) there is better applicability
Compared to traditional without ice broken string testing program, this method considers the impact of the factors such as wire type, ice covering thickness and wire initial tension, more adapts to the present situation that present transmission pressure is built.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is the ice coating wire broken string test model comprising continuous 3 grades of wires;
Fig. 2 is A1 operating mode middle gear span centre point lateral displacement time-histories;
Fig. 3 is A2 operating mode middle gear span centre point lateral displacement time-histories;
Fig. 4 is A1 operating mode middle gear wire tension time-histories;
Fig. 5 is A2 operating mode middle gear wire tension time-histories;
Reference numeral: angle pole, 2. break tripping gear, 3. straight line pole, 4. insulator, 5. displacement transducer, 6. wire, 7. binding iron wire, 8. simulation ice-coating steel wire rope, 9. for regulating the earth anchor of wire initial tension, 10. basis,
tension pick-up.
Detailed description of the invention
Below in conjunction with example, the present invention will be described in detail.
In at present relevant numerical analysis of breaking and experimental study, all do not consider that icing affects.In addition, damping has considerable influence to broken string response attenuation process, does not test the damping of tower line system, mostly rule of thumb adopt an assumed value, have impact on the precision of conductor cord disconnection dynamical simulation analysis result when numerical analysis in experimental study in the past.
The invention provides a kind of for test method used for transmission line ice coating disconnection.This method has considered the impact of the factors such as wire type, ice covering thickness and wire initial tension, by building continuous multi-gear power transmission line section, adopt the icing weight of ballasting method simulation different-thickness, carry out the conductor cord disconnection test of different conductor model, different ice covering thickness, test span centre point wire tension and span centre point lateral displacement time-histories under different operating mode, calculate the damping ratio in test wire section under different operating mode, determine the dynamic impact coefficient of different operating mode lower wire tension force, finally for Ice Area shaft tower broken string Load value provides foundation.Break compared with test method with traditional without ice, the method has the precision of better applicability and Geng Gao.
A kind of test method used for transmission line ice coating disconnection, comprises the following steps:
(1) break test wire section method for designing
1. work transmission line is first selected to commonly use wire type; According to the actual span in test wire section and meteorological condition, select the suspension string model be applicable to.
2. with the controlled load case that the operating mode that breaks designs for steel tube rod structure, by broken string load design steel pipe pole and basis.
3. manual unhook discharge mechanism is adopted to realize conductor cord disconnection.
4. break discharge mechanism, tension pick-up and displacement transducer is installed in the span centre position of each shelves wire, and the wire initial tension that tension pick-up range can be determined according to finite element analysis and broken string tension force are determined.
(2) icing simulation and computation method for hot
1. in broken string test, wire adopts single conductor, and icing adopts the method simulation of the quality steel wire ropes such as binding
The icing weight w (kg/m) of conductor when 2. calculating different ice thickness according to formula (1), according to calculating ice gravity treatment steel wire rope model.
w＝900×πδ(d+δ) (1)
In formula, δ is ice covering thickness (m), and d is diameter of wire (m).
(3) ice coating wire original state establishing method
Regulating wire initial tension by earth anchor, when ensureing suspension string vertical state, making it to reach design conditions initial tension value.Wire initial tension directly can be recorded by tension pick-up, total powerstation also will be adopted during test to measure middle gear span centre point sag, the tension force recorded, sag should meet the theoretical corresponding relation shown in formula (2), thus verify the tonometric accuracy of initial static further.
f
m＝gl
2/8T
0(2)
F in formula
mfor span centre point sag (m), g is conductor weight (N/m), l is wire span (m), T
0for minimum point Horizontal Tension (N).
(4) ice coating wire damping recognition methods
The displacement transducer in 1 horizontal path direction is installed in wire span centre position, adopts artificial excitation's method that wire is laterally vibrated, measure across neutral displacement time-history curves.Ice coating wire damping ratio is calculated again according to the free Attenuation Method shown in formula (3).
ξ＝δ
m/2πm (3)
δ in formula
m≡ l
n(d
n/ d
n+m) be the logarithmic decrement after m week, d
nand d
n+mfor span centre point n-th and n-th+m displacement peak value.
(5) break tension test and analytical method
1. wire dynamic tension adopts dynamic strain measuring systematic survey, and input sample frequency as required before broken string, Measuring Time starts from the setting of ice coating wire original state, until the rear wire of broken string, suspension string reach settling position and terminate.
2. according to wire tension time-history curves, determine peak tensions and remaining static tensile, calculate broken string tension force dynamic impulsion coefficient.
Embodiment 1:
The invention provides a kind of for test method used for transmission line ice coating disconnection.This method has considered the impact of the factors such as wire type, ice covering thickness and wire initial tension, breaks compared with test method, have the precision of better applicability and Geng Gao with traditional without ice.
For achieving the above object, the present invention is by building continuous 3 grade of 4 bar 3 line model, and experimental rig is arranged as shown in Figure 1.Binding is adopted to weigh the method analog conducting wire icing of steel wire rope with icing etc., broken string tripping gear is installed in shelves span centre position, limit, according to the different designs operating condition of test of wire type, ice covering thickness, test middle gear span centre point lateral displacement attenuation curve and grade conductor cord disconnection tension force time-history curves that do not break under each operating mode, determine ice coating wire damping ratio and wire tension dynamic impulsion coefficient.
A kind of test method used for transmission line ice coating disconnection of the present invention, is characterized in that, comprise the following steps:
1. broken string test wire section design
First work transmission line is selected to commonly use wire type; According to the actual span in test wire section and meteorological condition, select the suspension string model be applicable to.According to design discipline requirement, the controlled load case that broken string operating mode designs for steel tube rod structure, by broken string load design steel pipe pole and basis.Broken string adopts manual unhook discharge mechanism to realize, and discharge mechanism two ends are connected with the steel anchor at conductor compression jointing place by U-shaped ring.Pull trigger extension bar laterally, the hook be connected with steel anchor is ejected, thus realize broken string simulation.
Broken string discharge mechanism, tension pick-up and displacement transducer are installed in the span centre position of each shelves wire.Broken string peak tension generally can not exceed wire initial tension, and tension pick-up range can be determined according to the static analysis result based on method such as line length such as grade.
2. icing Weight computation
In broken string test, wire adopts single conductor, and icing adopts the method simulation of the quality steel wire ropes such as binding.The icing weight w (kg/m) of conductor when calculating different ice thickness according to formula (1), according to calculating ice gravity treatment steel wire rope model.
w＝900×πδ(d+δ) (1)
In formula, δ is ice covering thickness (m), and d is diameter of wire (m).
3. icing Weight computation
Wire initial tension can being regulated by the north side earth anchor shown in accompanying drawing 1, when ensureing suspension string vertical state, making it to reach design conditions initial tension value.Wire initial tension directly can be recorded by tension pick-up, total powerstation also will be adopted during test to measure middle gear span centre point sag, the tension force recorded, sag should meet the theoretical corresponding relation shown in formula (2), thus verify the tonometric accuracy of initial static further.
f
m＝gl
2/8T
0(2)
F in formula
mfor span centre point sag (m), g is conductor weight (N/m), l is wire span (m), T
0for minimum point Horizontal Tension (N).
4. ice coating wire damping identification
From the model analysis of typical case's 3 grades of models, front two first order modes of ice coating wire are oscillation crosswise.The displacement transducer in 1 horizontal path direction is installed in middle gear wire span centre position, adopts artificial excitation's method that wire is laterally vibrated, measure across neutral displacement time-history curves.Ice coating wire damping ratio is calculated again according to the free Attenuation Method shown in formula (3).
ξ＝δ
m/2πm (3)
δ in formula
m≡ ln (d
n/ d
n+m) be the logarithmic decrement after m week, d
nand d
n+mfor span centre point n-th and n-th+m displacement peak value.
5. broken string tension test and analysis
Wire dynamic tension adopts dynamic strain measuring systematic survey, and input sample frequency as required before broken string, Measuring Time starts from the setting of ice coating wire original state, until the rear wire of broken string, suspension string reach settling position and terminate.According to wire tension time-history curves, determine peak tensions and remaining static tensile, calculate broken string tension force dynamic impulsion coefficient (ratio of dynamic impulsion coefficient and peak tensions and remaining static tensile).
Now apply the process that instantiation introduction adopts said method identification ice coating wire damping ratio and test lead broken string tension force.
Carry out the design of broken string test wire section according to step 1, continuous 3 grades of spans are followed successively by 95m, 100m and 95m.Two ends steel pipe pole rod-type is DDG5 terminal pole, high 5m; Middle two base steel pipe pole rod-type are DZG8 straight line pole, bar height 8m.Wire type adopts JL/GIA400/35, maximum working tension 39.48kN.Suspension string adopts composite insulator, structure length 1.7m, specified pulling force 7 tons.Concrete operating condition of test is as following table:
| Operating mode is numbered | Initial tension (kN) | Ice covering thickness (mm) |
| A1 | 28.4 | 20 |
| A2 | 36.0 | 30 |
The icing weight calculating A1 and A2 operating mode corresponding according to the formula (1) in step 2 is 2.65kg/m and 4.82kg/m.Steel wire rope model according to the gravity treatment of calculating ice is Φ 26 (6 × 37+FC) and Φ 28 (6 × 37+FC), and the unit weight of two kinds of steel wire ropes is respectively 2.34kg/m and 2.71kg/m.Wherein 20mm icing is by 1 Φ 28 steel wire rope approximate simulation, and 30mm icing is by 1 Φ 26 and 1 Φ 28 steel wire rope approximate simulation.
According to step 3, wire span centre point tension force is adjusted to design conditions setting, measure two operating mode middle gear wire span centre point conducting wire sags, A1 and A2 working condition measuring value is respectively 1.70m and 2.12m.Calculated value is respectively 1.78m and 2.19m, and difference 4.9% and 3.5%, describes the accuracy of tension pick-up test result.
According to step 4, measure A1, A2 operating mode middle gear wire span centre point lateral displacement time-histories, as shown in accompanying drawing 2 and accompanying drawing 3.Employing formula (2) calculates each operating mode ice coating wire damping ratio, and concrete result of calculation sees the following form.
| Operating mode is numbered | Initial spike d n/mm | Initial spike d n+m/mm | Decay all number m | Damping ratio ξ |
| A1 | 121.1 | 45.5 | 11 | 0.014 |
| A2 | 161.2 | 102.7 | 2 | 0.036 |
According to step 5, setting tension pick-up sample frequency is 30Hz, measures middle gear wire tension time-histories when A1 and A2 operating mode ice coating wire breaks respectively, as shown in figures 4 and 5.Tension force time-history curves with reference to the accompanying drawings shown in 4 and accompanying drawing 5, obtains each operating mode peak-peak tension force, remaining static tensile and dynamic impulsion coefficient and sees the following form.
| Operating mode is numbered | Peak tensions (kN) | Remaining static tensile (kN) | Dynamic impulsion coefficient |
| A1 | 18.50 | 6.20 | 2.98 |
| A2 | 20.36 | 9.88 | 2.06 |
According to specific exemplary embodiment, invention has been described herein.It will be apparent under not departing from the scope of the present invention, carrying out suitable replacement to one skilled in the art or revise.Exemplary embodiment is only illustrative, instead of the restriction to scope of the present invention, and scope of the present invention is defined by appended claim.
Claims (3)
1. a test method used for transmission line ice coating disconnection, is characterized in that said method comprising the steps of:
1), broken string test wire section design:
Wire type, suspension string model are selected:
According to the actual span of transmission line of electricity actual design condition and test wire section and the discrepancy in elevation, Selection experiment wire type and suspension string model, after suspension string length will ensure conductor cord disconnection, suspension string and the wire distance to the ground of minimum point in swing process is greater than 0;
Steel pipe pole and basic engineering:
Using the controlled load case that the operating mode that breaks designs as steel tube rod structure, calculate steel pipe pole root bending moment when breaking, according to GB50545-2010 110kV ~ 750kV overhead transmission line design specification design steel pipe pole and basis;
Conductor cord disconnection:
Manual unhook discharge mechanism is adopted to realize;
Broken string discharge mechanism, tension pick-up and displacement transducer are installed on each shelves wire;
2), icing simulation and icing Weight computation
Icing adopts the quality steel wire rope simulations such as binding;
Icing Weight computation formula is:
w＝900×πδ(d+δ) (1)
Wherein: w is the icing weight of conductor, and units/kg/m, δ is ice covering thickness, unit m, d diameter of wire, unit m;
Icing weight w according to conductor selects steel wire rope model;
3), ice coating wire original state setting
fm＝gl
2/8T
0(2)
Wherein: f
mfor span centre point sag, unit m; G is conductor weight, unit N/m; L is wire span, unit m; T
0for wire minimum point Horizontal Tension, unit N;
4), ice coating wire damping identification
ξ＝δ
m/2πm (3)
δ
m≡ln(d
n/d
n+m) (4)
Wherein: ξ is ice coating wire damping ratio; δ
mfor the logarithmic decrement after conductor vibration m week; d
nand d
n+mfor span centre point n-th and n-th+m displacement peak value;
5), broken string tension test and analysis
Wire dynamic tension is directly measured by tension pick-up;
2. a kind of test method used for transmission line ice coating disconnection as claimed in claim 1, is characterized in that described broken string discharge mechanism, tension pick-up and displacement transducer are installed on the span centre position of each shelves wire.
3. a kind of test method used for transmission line ice coating disconnection as claimed in claim 1, it is characterized in that described ice coating wire original state situation, suspension string vertical is in level ground.
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