CN102507123A - Test method used for transmission line ice coating disconnection - Google Patents
Test method used for transmission line ice coating disconnection Download PDFInfo
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- CN102507123A CN102507123A CN2011103008726A CN201110300872A CN102507123A CN 102507123 A CN102507123 A CN 102507123A CN 2011103008726 A CN2011103008726 A CN 2011103008726A CN 201110300872 A CN201110300872 A CN 201110300872A CN 102507123 A CN102507123 A CN 102507123A
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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 the electric power line pole tower load test, specifically relate to a kind of powerline ice-covering conductor cord disconnection test method.
Background technology
Icing, wave and all possibly cause transmission line wire with meteorological disasters such as high wind or ground wire breaks.Winter, aerial condutor and shaft tower were easy to icing, and serious icing and the conductor galloping that causes because of icing are to cause the ultra-high-tension power transmission line broken string and fall the main cause of tower.Must conscientiously investigate an important parameter of calculating when ice covering thickness is the design aerial high-voltage power transmission line, calculate the stress of aerial high-voltage lead when different ice covering thickness, have crucial meaning for the safe operation that ensures transmission line of electricity.
All took place to cause flashover, broken string in the many areas of China, fell bar accidents such as (towers), caused enormous economic loss to society because of wire icing makes the loading increase of transmission line of electricity.For example, in January, 2008 universal drop in all parts of the country heavy snow, southern number is economized transmission line of electricity and is met with ice and snow 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 accident such as tower.
The transmission line of electricity broken string can produce bigger longitudinal unbalance tension force; Can cause transient impact to electric power line pole tower; The internal force and the displacement response of transmission tower are obviously increased, and the lever tower that causes breaking collapses even causes that the transmission line of electricity string falls, and has a strong impact on the safe operation of transmission line of electricity.Therefore, the analysis of transmission line of electricity broken string load and experimental study is studied always and designer's extensive concern.
The article that Hu Deshan, Yuan Shun and Liu Ning deliver in 2009 annual power industry Hi-pot tests and the Electrical Measurement Technology symposial " force analysis during the serious icing of aerial condutor "; Set forth the technology of the static tension of ice coating wire in detail; The analytical calculation of ice coating wire dynamic stress; On this basis, use simulation calculation software ANSYS to set up model, the stress of the high hanging wire point place lead when calculating conductor galloping.For transmission line of electricity design is provided fundamental basis.
(electrotechnics journal, Vol25,1 in " the lead dynamic tension that ice coating wire is waved characteristic and caused " literary composition that people such as Wang Shaohua deliver; 2010; P159-166), set up the Three Degree Of Freedom physical model that ice coating wire is waved, adopted Fluent software that the aerodynamic parameter of ice coating wire has been carried out numerical simulation; Utilize the Simulink emulation module to carry out the dynamic similation that icing is waved on this basis, obtained the fundamental characteristics that ice coating wire is waved.The result shows: wave when reaching steady state (SS), vertical direction and horizontal direction vibrational waveform are approximately simple harmonic wave; It is approximate tiltedly oval to wave track; All amplitude increases along with waving, span shortens for lead Horizontal Tension, the vertical tension force component variation of hitch point amount, sag increases and increases; The wire tension variation range that the waving of single half-wave causes is maximum, the easyliest makes the lead damage; The parity of waving the half-wave number has considerable influence to tension variation number percent.
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 in monitoring wire icing thickness; When the iron tower unbalanced tensile force exceeds standard, in time report to the police,, guarantee the security of circuit under the icing condition to avoid taking place the accident of falling the tower.
Above-mentioned technology is the technology or the method for actual detected wire icing thickness, and all has the construction of pair transmission pressure that foundation is provided.
Behind the electrical network ice damages in 2008, the operating mode that will break in the design specifications of new revision does not change icing, wire breaking into by there being the ice broken string.In addition, damping has considerable influence to broken string response attenuation process, in the experimental study in the past not to tower line system damping test, when numerical analysis, mostly rule of thumb adopt an assumed value, influenced the precision of conductor cord disconnection dynamical simulation analysis result.Be kinematic behavior and the broken string load of accurately confirming ice coating wire; Be necessary through making up continuous multi-gear power transmission line highway 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 transversal displacement time-histories under the different operating modes, calculate the damping ratio in test wire highway section under the different operating modes; Confirm the dynamic impact coefficient of different operating mode lower wire tension force, finally foundation is provided for icing district shaft tower broken string Load value.
Summary of the invention
The object of the invention is to provide a kind of powerline ice-covering conductor cord disconnection test method, for icing district shaft tower broken string Load value provides foundation; This method is taken all factors into consideration the influence of factors such as wire type, ice covering thickness and lead initial tension, adds the influence of damping to broken string response attenuation process simultaneously, and is higher to the test and the analysis precision of ice coating wire broken string stress, has better adaptability.
For realizing the foregoing invention purpose, the technical scheme that the present invention takes is:
A kind of powerline ice-covering conductor cord disconnection test method, its improvements are said method comprising the steps of:
1) broken string test wire highway section design:
Wire type, the string model of dangling are selected:
According to the actual span of transmission line of electricity actual design condition and test wire highway section and the discrepancy in elevation, to select the test lead model and dangle the string model, after the string length of dangling will guarantee conductor cord disconnection, the distance to the ground of dangle string and lead minimum point in swing process was greater than 0;
Steel pipe pole and basic engineering:
With the control work condition of broken string operating mode as the steel pipe pole structural design, steel pipe pole root moment of flexure when calculating broken string is according to GB50545-2010110kV～750kV overhead transmission line design specifications design steel pipe pole and basis;
Conductor cord disconnection:
Adopt manual unhook discharge mechanism to realize;
Broken string discharge mechanism, tension pick-up and displacement transducer are installed on each grade lead;
2) icing simulation and icing weight are calculated
Icing adopts quality wire rope simulations such as binding;
Icing weight computing formula is:
w＝900×πδ(d+δ) (1)
Wherein: w is the icing weight of lead unit length, and units/m, δ are ice covering thickness, the m of unit, d diameter of wire, the m of unit;
Icing weight w according to the lead unit length selects the wire rope model for use;
3) the ice coating wire original state is set
f
m＝gl
2/8T
0 (2)
Wherein: f
mBe span centre point sag, the m of unit; G is the lead unit weight, the N/m of unit; L is the lead span, the m of unit; T
0Be lead minimum point Horizontal Tension, the N of unit;
4) ice coating wire damping identification
ξ＝δ
m/2πm (3)
δ
m≡ln(d
n/d
n+m) (4)
Wherein: ξ is the ice coating wire damping ratio; δ
mBe the logarithmic decrement after conductor vibration m week; d
nAnd d
N+mFor span centre is put n and n+m displacement peak value;
5) broken string tension test and analysis
The lead dynamic tension is directly measured by tension pick-up;
Wherein: said broken string discharge mechanism, tension pick-up and displacement transducer are installed on the span centre position of each grade lead.
Wherein: said ice coating wire original state situation, the string vertical that dangles is in the level ground.
Owing to adopted technique scheme, compared with prior art, beneficial effect of the present invention comprises:
1) the simulation analysis precision improves
This method Considering Damping is to the influence of broken string response attenuation process, and damping is tested to tower line system, makes that conductor cord disconnection dynamical simulation analysis result is more accurate;
2) has better applicability
Than traditional nothing ice broken string testing program, this method is taken all factors into consideration the influence of factors such as wire type, ice covering thickness and lead initial tension, adapts to the present situation that present transmission pressure is built more.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further specified.
Fig. 1 is the ice coating wire broken string test model that comprises continuous 3 grades of leads;
Fig. 2 is a bay span centre point transversal displacement time-histories in the A1 operating mode;
Fig. 3 is a bay span centre point transversal displacement time-histories in the A2 operating mode;
Fig. 4 is a bay wire tension time-histories in the A1 operating mode;
Fig. 5 is a bay wire tension time-histories in the A2 operating mode;
Reference numeral: angle pole, trip mechanism, 3. straight line pole 2. break; 4. insulator, 5. displacement transducer, 6. lead; 7. iron wire is used in binding, 8. simulates icing and uses wire rope, 9. is used to regulate the earth anchor of lead initial tension; 10. basic,
tension pick-up.
Embodiment
Below in conjunction with instance the present invention is carried out detailed explanation.
In the numerical analysis and experimental study of relevant broken string, all do not consider the icing influence at present.In addition, damping has considerable influence to broken string response attenuation process, in the experimental study in the past not to tower line system damping test, when numerical analysis, mostly rule of thumb adopt an assumed value, influenced the precision of conductor cord disconnection dynamical simulation analysis result.
The invention provides a kind of powerline ice-covering conductor cord disconnection test method that is used for.This method has been taken all factors into consideration the influence of factors such as wire type, ice covering thickness and lead initial tension; Through making up continuous multi-gear power transmission line highway 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 transversal displacement time-histories under the different operating modes, calculate the damping ratio in test wire highway section under the different operating modes; Confirm the dynamic impact coefficient of different operating mode lower wire tension force, finally foundation is provided for icing district shaft tower broken string Load value.Compare with traditional nothing ice broken string test method, this method has the precision of better applicability and Geng Gao.
A kind of powerline ice-covering conductor cord disconnection test method may further comprise the steps:
(1) broken string test wire highway section method for designing
1. at first select work transmission line to use wire type always; According to actual span in test wire highway section and meteorological condition, select the string model of dangling that is fit to.
2. be the control work condition of steel pipe pole structural design with the broken string operating mode, by broken string load design steel pipe pole and basis.
3. adopt manual unhook discharge mechanism to realize conductor cord disconnection.
4. break discharge mechanism, tension pick-up and displacement transducer is installed in the span centre position of each grade lead, and the tension pick-up range can be confirmed with broken string tension force according to the lead initial tension that finite element analysis is confirmed.
(2) icing simulation and computation method for hot
1. lead adopts S.C. in the broken string test, and icing adopts the method simulation of quality wire rope such as binding
The icing weight w (kg/m) of lead unit length when 2. calculating different ice thickness according to formula (1) uses the wire rope model according to calculating the ice gravity treatment.
w＝900×πδ(d+δ) (1)
δ is ice covering thickness (m) in the formula, and d is diameter of wire (m).
(3) ice coating wire original state establishing method
Regulate the lead initial tension through earth anchor, when guaranteeing to dangle string vertical state, make it to reach design conditions initial tension value.The lead initial tension can directly be recorded by tension pick-up; Also to adopt total powerstation centering bay span centre point sag to measure during test; The tension force that records, sag should satisfy the theoretical corresponding relation shown in the formula (2), thereby further verify the tonometric accuracy of initial static.
f
m＝gl
2/8T
0 (2)
F in the formula
mBe span centre point sag (m) that g is lead unit weight (N/m), l is lead span (m), T
0Be minimum point Horizontal Tension (N).
(4) ice coating wire damping recognition methods
The displacement transducer of 1 horizontal path direction is installed in lead span centre position, is adopted artificial excitation's method that lead is laterally vibrated, measure span centre point displacement time-history curves.Calculate the ice coating wire damping ratio according to the free Attenuation Method shown in the formula (3) again.
ξ＝δ
m/2πm (3)
δ in the formula
m≡ l
n(d
n/ d
N+m) be the logarithmic decrement of m after week, d
nAnd d
N+mFor span centre is put n and n+m displacement peak value.
(5) broken string tension test and analytical approach
1. the lead dynamic tension adopts the dynamic strain test macro to measure, input sample frequency as required before the broken string, and Measuring Time is set beginning from the ice coating wire original state, until broken string back lead, the string that dangles reach settling position and finish.
2. according to the wire tension time-history curves, confirm peak tensions and remaining static tension force, calculate broken string tension force dynamic impulsion coefficient.
Embodiment 1:
The invention provides a kind of powerline ice-covering conductor cord disconnection test method that is used for.This method has been taken all factors into consideration the influence of factors such as wire type, ice covering thickness and lead initial tension, compares with traditional nothing ice broken string test method, has the precision of better applicability and Geng Gao.
For achieving the above object, the present invention is through making up continuous 3 grade of 4 bar 3 line model, and test unit is arranged shown in accompanying drawing 1.Adopt the method analog conducting wire icing of heavy wire rope such as binding and icing; The broken string trip mechanism is installed in shelves span centre position on the limit; Different designs operating condition of test according to wire type, ice covering thickness; The bay span centre point transversal displacement die-away curve and the shelves conductor cord disconnection tension force time-history curves that do not break are confirmed ice coating wire damping ratio and wire tension dynamic impulsion coefficient in testing under each operating mode.
A kind of powerline ice-covering conductor cord disconnection test method of the present invention is characterized in that, may further comprise the steps:
1. broken string test wire highway section design
At first select work transmission line to use wire type always; According to actual span in test wire highway section and meteorological condition, select the string model of dangling that is fit to.According to the design discipline requirement, the broken string operating mode is the control work condition of steel pipe pole structural design, by broken string load design steel pipe pole and basis.Broken string adopts manual unhook discharge mechanism to realize, the discharge mechanism two ends link to each other with the steel anchor at conductor compression jointing place through U type ring.Spur the trigger extension rod laterally, the hook that will link to each other with the steel anchor ejects, thereby realizes the broken string simulation.
Broken string discharge mechanism, tension pick-up and displacement transducer are installed in the span centre position of each grade lead.The broken string peak tension generally can not surpass the lead initial tension, and the tension pick-up range can be according to confirming based on the static analysis result who waits the line length method.
2. icing weight is calculated
Lead adopts S.C. in the broken string test, and icing adopts the method simulation of quality wire rope such as binding.The icing weight w (kg/m) of lead unit length when calculating different ice thickness according to formula (1) uses the wire rope model according to calculating the ice gravity treatment.
w＝900×πδ(d+δ) (1)
δ is ice covering thickness (m) in the formula, and d is diameter of wire (m).
3. icing weight is calculated
Can regulate the lead initial tension through the north side earth anchor shown in the accompanying drawing 1, when guaranteeing to dangle string vertical state, make it to reach design conditions initial tension value.The lead initial tension can directly be recorded by tension pick-up; Also to adopt total powerstation centering bay span centre point sag to measure during test; The tension force that records, sag should satisfy the theoretical corresponding relation shown in the formula (2), thereby further verify the tonometric accuracy of initial static.
f
m＝gl
2/8T
0 (2)
F in the formula
mBe span centre point sag (m) that g is lead unit weight (N/m), l is lead span (m), T
0Be minimum point Horizontal Tension (N).
4. ice coating wire damping identification
Model analysis by 3 grades of models of typical case can know that preceding two first order modes of ice coating wire are transverse vibration.The displacement transducer of 1 horizontal path direction is installed in middle bay lead span centre position, is adopted artificial excitation's method that lead is laterally vibrated, measure span centre point displacement time-history curves.Calculate the ice coating wire damping ratio according to the free Attenuation Method shown in the formula (3) again.
ξ＝δ
m/2πm (3)
δ in the formula
m≡ ln (d
n/ d
N+m) be the logarithmic decrement of m after week, d
nAnd d
N+mFor span centre is put n and n+m displacement peak value.
5. broken string tension test and analysis
The lead dynamic tension adopts the dynamic strain test macro to measure, input sample frequency as required before the broken string, and Measuring Time is set beginning from the ice coating wire original state, until broken string back lead, the string that dangles reach settling position and finish.According to the wire tension time-history curves, confirm peak tensions and remaining static tension force, calculate broken string tension force dynamic impulsion coefficient (the dynamic impulsion coefficient is the ratio of peak tensions and remaining static tension force).
Use the process that said method identification ice coating wire damping ratio and test lead broken string tension force are adopted in the instantiation introduction at present.
According to break test wire highway section design of step 1, continuous 3 grades of spans are followed successively by 95m, 100m and 95m.Two ends steel pipe pole bar type is the DDG5 terminal pole, high 5m; Middle two basic steel pipe pole bar types are the DZG8 straight line pole, the high 8m of bar.Wire type adopts JL/GIA400/35, maximum working tension 39.48kN.The string that dangles adopts composite insulator, structure length 1.7m, 7 tons of specified pulling force.Concrete operating condition of test such as following table:
| The operating mode numbering | Initial tension (kN) | Ice covering thickness (mm) |
| A1 | 28.4 | 20 |
| A2 | 36.0 | 30 |
The icing weight of calculating A1 and A2 operating mode correspondence according to the formula (1) in the step 2 is 2.65kg/m and 4.82kg/m.According to calculate wire rope model that the ice gravity treatment uses as Φ 26 (6 * 37+FC) with Φ 28 (unit weight of 6 * 37+FC), two kinds of wire rope is respectively 2.34kg/m and 2.71kg/m.Wherein the 20mm icing is by 1 Φ, 28 wire rope approximate simulations, and the 30mm icing is by 1 Φ 26 and 1 Φ 28 wire rope approximate simulation.
According to step 3, lead span centre point tension force is transferred to the design conditions setting, bay lead span centre point lead sag in two operating modes to be measured, A1 and A2 working condition measuring value are respectively 1.70m and 2.12m.Calculated value is respectively 1.78m and 2.19m, differs 4.9% and 3.5%, and the tension pick-up precision of test result has been described.
According to step 4, measure bay lead span centre point transversal displacement time-histories in A1, the A2 operating mode, shown in accompanying drawing 2 and accompanying drawing 3.Employing formula (2) is calculated each operating mode ice coating wire damping ratio, and concrete result of calculation sees the following form.
| The operating mode numbering | Initial spike d n/mm | Initial spike d n+m/mm | All number m decay | Damping ratio ξ |
| A1 | 121.1 | 45.5 | 11 | 0.014 |
| A2 | 161.2 | 102.7 | 2 | 0.036 |
According to step 5, setting the tension pick-up SF is 30Hz, when measuring A1 and A2 operating mode ice coating wire broken string respectively in bay wire tension time-histories, shown in accompanying drawing 4 and accompanying drawing 5.According to accompanying drawing 4 and the tension force time-history curves shown in the accompanying drawing 5, obtain each operating mode peak-peak tension force, remaining static tension force and dynamic impulsion coefficient and see the following form.
| The operating mode numbering | Peak tensions (kN) | Remaining static tension force (kN) | The dynamic impulsion coefficient |
| A1 | 18.50 | 6.20 | 2.98 |
| A2 | 20.36 | 9.88 | 2.06 |
Invention has been described according to specific exemplary embodiment here.It will be conspicuous under not departing from the scope of the present invention, carrying out suitable replacement to one skilled in the art or revise.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present invention, scope of the present invention is by appended claim definition.
Claims (3)
1. powerline ice-covering conductor cord disconnection test method is characterized in that said method comprising the steps of:
1) broken string test wire highway section design:
Wire type, the string model of dangling are selected:
According to the actual span of transmission line of electricity actual design condition and test wire highway section and the discrepancy in elevation, to select the test lead model and dangle the string model, after the string length of dangling will guarantee conductor cord disconnection, the distance to the ground of dangle string and lead minimum point in swing process was greater than 0;
Steel pipe pole and basic engineering:
With the control work condition of broken string operating mode as the steel pipe pole structural design, steel pipe pole root moment of flexure when calculating broken string is according to GB50545-2010110kV～750kV overhead transmission line design specifications design steel pipe pole and basis;
Conductor cord disconnection:
Adopt manual unhook discharge mechanism to realize;
Broken string discharge mechanism, tension pick-up and displacement transducer are installed on each grade lead;
2) icing simulation and icing weight are calculated
Icing adopts quality wire rope simulations such as binding;
Icing weight computing formula is:
w＝900×πδ(d+δ) (1)
Wherein: w is the icing weight of lead unit length, and units/m, δ are ice covering thickness, the m of unit, d diameter of wire, the m of unit;
Icing weight w according to the lead unit length selects the wire rope model for use;
3) the ice coating wire original state is set
f
m＝gl
2/8T
0 (2)
Wherein: f
mBe span centre point sag, the m of unit; G is the lead unit weight, the N/m of unit; L is the lead span, the m of unit; T
0Be lead minimum point Horizontal Tension, the N of unit;
4) ice coating wire damping identification
ξ＝δ
m/2πm (3)
δ
m≡l
n(d
n/d
n+m) (4)
Wherein: ξ is the ice coating wire damping ratio; δ
mBe the logarithmic decrement after conductor vibration m week; d
nAnd d
N+mFor span centre is put n and n+m displacement peak value;
5) broken string tension test and analysis
The lead dynamic tension is directly measured by tension pick-up;
2. a kind of powerline ice-covering conductor cord disconnection test method as claimed in claim 1 is characterized in that said broken string discharge mechanism, tension pick-up and displacement transducer are installed on the span centre position of each grade lead.
3. a kind of powerline ice-covering conductor cord disconnection test method as claimed in claim 1 is characterized in that said ice coating wire original state situation, and the string vertical that dangles is in the level ground.
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