CN102916380A - Design method aiming at preventing transmission line insulator string from being damaged by wind - Google Patents
Design method aiming at preventing transmission line insulator string from being damaged by wind Download PDFInfo
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- CN102916380A CN102916380A CN2012104530455A CN201210453045A CN102916380A CN 102916380 A CN102916380 A CN 102916380A CN 2012104530455 A CN2012104530455 A CN 2012104530455A CN 201210453045 A CN201210453045 A CN 201210453045A CN 102916380 A CN102916380 A CN 102916380A
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Abstract
The invention discloses a design method aiming at preventing a transmission line insulator string from being damaged by wind. The method aims to establish a finite element model of a transmission line multi-body system comprising the transmission line, an insulator string and the like based on a strong coupling effect of the transmission line and the insulator string and analyze dynamic characteristics of the insulator string from the system point of view to acquire the deflection and basic vibration frequency of the insulator string, and utilizes a finite element model of a vibration damper to optimize the size of the model so as to finally prevent deflection caused by the wind and prevent the insulator string from being broken by the wind, thereby achieving the optimal design of the vibration damper. The method comprises the following steps: (1) establishing the finite element model of the transmission line multi-body system; (2) analyzing dynamic characteristics of the transmission line multi-body system; (3) designing the vibration damper; and (4) mounting the vibration damper. According to the invention, accidents of the deflection, breaking of the insulator string and the like caused by the wind can be purposefully prevented; and the method has a wide use range, and is suitable for preventing the insulator string from being damaged by wind.
Description
Technical field
The present invention relates to a kind of method for designing take the windburn of control transmission circuit insulator string as target, belong to the line protection technical field.
Background technology
Transmission line is the important component part of electrical network, and its safe and stable operation directly has influence on stability and the power supply reliability of electrical network.In recent years, because climate change, strong wind weather is increasing, and the safe operation of overhead transmission line has been brought serious threat.On the one hand, the power transmission line of insulator string and suspension thereof will produce windage yaw and waves under the high wind effect, and the distance between the electrified body and shaft tower less than the electric clearance of allowing the windage yaw flashover fault will occur in the process if wave; On the other hand, high wind also may make the insulator string vibration cause the alternating bending stress of connecting portion excessive, even surpasses its crack tip stress intensity factor, makes it crack the charming appearance and behaviour fracture accident that causes insulator string.Therefore, preventing transmission circuit insulator string windburn accident, is a very important job that guarantees the transmission line safe and stable operation, has been subject to the attention of Electric Design department, power supply management department.
Taking targeted specifically prophylactico-therapeutic measures is the key that improves insulator string wind resistance evil ability.Mainly for the windage yaw accident, the researcher proposes and has taked some prophylactico-therapeutic measures, as carrys additionally weight, adjustment shaft tower position, the suspension that changes insulator string and assembly type etc.In numerous measures, it is most economical undoubtedly and have engineering practicability most to carry additionally the method for weight.The structure that heavy punch piece is directly installed on the gold utensil of insulator string lower end is used in some circuits, but its prevention effect to the insulator string windburn does not gain public acceptance.In fact, weight is as far as possible near fundamental frequency or the excited frequency of insulator string by its natural frequency of vibration as a kind of vibration isolator.Like this, when insulator string is subjected to exciting and when vibrating, weight will produce an inertia force opposite with the insulator string direction of vibration and act on the insulator string, make the vibration reaction decay of insulator string.Yet, the dynamic characteristic of insulator string also lacks effectively understanding at present, and insulator string is in one and comprises in the multi-body system that power transmission line, gold utensil etc. consist of, because the coupling with power transmission line etc., even the beat of same dielectric substring is also fully different with vibration frequency in the different circuits, so the design of weight is blindly substantially.
Summary of the invention
The objective of the invention is, problem according to existing transmission circuit insulator string windburn control existence, the present invention discloses a kind of method for designing take the windburn of control transmission circuit insulator string as target, to reach the windage yaw of effective control insulator string or wind-induced vibration, improves its wind loading rating.
Technical scheme of the present invention is, the present invention is based on the strong coupling effect of power transmission line and insulator string, foundation comprises the transmission line multi-body system FEM (finite element) model of power transmission line, insulator string etc., analyze the insulator string dynamic characteristic from system perspective, obtain its beat and vibration fundamental frequency, and as target, utilize vibration isolator FEM (finite element) model Optimized model size, finally respectively take windburn accidents such as control windage yaw and the fractures of insulator string charming appearance and behaviour as target, realize the optimal design of vibration isolator.
A kind of method for designing take the windburn of control transmission circuit insulator string as target of the present invention may further comprise the steps:
(1) set up transmission line multi-body system Parameters of Finite Element model:
(1-1) nonlinear analysis and the constraint by suspension cable applies definite power transmission line original shape, sets up the power transmission line FEM (finite element) model;
(1-2) by Modal Parameters Identification, determine the insulator string material parameter by field test, set up the insulator string FEM (finite element) model;
(1-3) apply by boundary condition, set up the transmission line multi-body system Parameters of Finite Element model that comprises power transmission line, insulator string etc.
(2) transmission line multi-body system dynamic analysis
For transmission line multi-body system FEM (finite element) model prestressed modal analysis is arranged, determine in the multi-body system dynamic characteristic parameters such as insulator string beat and vibration fundamental frequency, the vibration shape.
(3) design of vibration isolator
It is convenient to install, use for transmission line, adopts non-linear pendulum vibration isolator, sets up the vibration isolator FEM (finite element) model, by Optimization Design respectively in the multi-body system insulator string beat and vibration fundamental frequency obtain the design of vibration isolator size as target.
(4) mounting design of vibration isolator
By hinged mode non-linear pendulum vibration isolator is installed on the conductor spacer of circuit.
The power transmission line suspension cable can adopt catenary curve or parabola theories in the step of the present invention (1), and preferred catenary curve is theoretical.
The middle power transmission line of step of the present invention (1) can adopt 3D, and only tension member, 3D beam and cable elements carry out modeling.
Insulator string comprises glass insulator strings, porcelain insulating substring and the composite insulator string that transmission line is commonly used in the step of the present invention (1).
Non-linear pendulum vibration isolator described in the step of the present invention (3) is weight class vibration isolator, and by changing pendulum weight, the parameters such as oscillating bar length, diameter can change its natural frequency.
The present invention's beneficial effect compared with the prior art is: (1) the present invention has considered the strong coupling effect of power transmission line and insulator string, has obtained insulator string beat and vibration fundamental frequency from system perspective, and the result is accurate; (2) the present invention sets up transmission line multi-body system Parameters of Finite Element model, can greatly improve the speed that model is set up, revised; (3) the present invention can obtain beat and the vibration fundamental frequency of insulator string, can carry out autotelic control for insulator string windburn accidents such as windage yaw and the fractures of insulator string charming appearance and behaviour, and the scope of application is wide; (4) vibration isolator of the present invention's design is installed on the conductor spacer, has avoided the prior art weight to add and has hung over the problem that causes electric conductor that the shaft tower arcing distance is reduced under the insulator string.
The present invention is applicable to the control of transmission circuit insulator string windburn.
Description of drawings
Fig. 1 is flow chart of steps of the present invention;
Fig. 2 is non-linear pendulum vibration isolator FEM (finite element) model;
Fig. 3 is non-linear pendulum absorber designing flow chart of steps;
Fig. 4 is transmission line multi-body system FEM (finite element) model figure;
Fig. 5 is the insulator string beat frequency vibration shape in the transmission line multi-body system;
Fig. 6 is the insulator string vibration frequency vibration shape in the transmission line multi-body system.
Embodiment
Below, in conjunction with accompanying drawing of the present invention embodiment is further described.
As shown in Figure 1, the embodiment of the invention proposes a kind of method for designing take the windburn of control transmission circuit insulator string as target, specifically may further comprise the steps:
(1) sets up the transmission line FEM (finite element) model
Adopt catenary curve or parabola theories, preferred catenary curve is theoretical, with 3D only tension member, 3D beam or cable elements carry out modeling, the nonlinear analysis by suspension cable and constraint apply determines the power transmission line original shape, sets up the power transmission line FEM (finite element) model.
(2) set up the insulator string FEM (finite element) model
By Modal Parameters Identification, for the transmission line insulator string types such as glass, porcelain insulating substring and composite insulator commonly used, determine the insulator string material parameter by field test, set up the insulator string FEM (finite element) model.
(3) set up transmission line multi-body system Parameters of Finite Element model
The parameters such as line span, the discrepancy in elevation and power transmission line material properties are determined in integrating step (1) and (2), apply by boundary condition, can set up the transmission line multi-body system Parameters of Finite Element model that comprises power transmission line, insulator string etc.
(4) transmission line multi-body system dynamic analysis
For transmission line multi-body system FEM (finite element) model prestressed modal analysis is arranged, can determine in the multi-body system dynamic characteristic parameters such as insulator string beat and vibration fundamental frequency, the vibration shape.
(5) vibration isolator size design
It is convenient to install, use for transmission line, adopt non-linear pendulum vibration isolator, set up vibration isolator FEM (finite element) model (as shown in Figure 2), in obtaining multi-body system on the basis of insulator string beat and vibration fundamental frequency, press the flow process shown in the accompanying drawing 3, as the demand frequency, and with the contrast of existing model of damper frequency, as not meeting the demands, then further revise the vibration isolator size (by changing pendulum weight, the parameter such as oscillating bar length, diameter), until the frequency of vibration isolator output meets the demands, can obtain needed vibration isolator size design this moment.
(6) vibration isolator mounting design
Hole at conductor spacer, non-linear pendulum vibration isolator is installed on by hinged mode on the conductor spacer of circuit, be preferably mounted at two conductor spacers adjacent with insulator string according to effectiveness in vibration suppression.
The embodiment of the invention prevents that to transmission circuit insulator string the windburn design is as follows:
The present embodiment insulator string is glass insulator strings LXHY3-160,28, and both sides span 474m, without the discrepancy in elevation, quadripartion power transmission line 4 * LGJ-400/35.
Fig. 4 is the transmission line multi-body system Parameters of Finite Element model of setting up.Fig. 5,6 is respectively in the multi-body system dynamic characteristic parameters such as insulator string beat and vibration fundamental frequency, the vibration shape.
Table 1 and table 2 are respectively control insulator string beat and the charming appearance and behaviour corresponding vibration isolator size that ruptures.Generally speaking, the weight of pendulum is the bigger the better in the vibration isolator, but the increase of pendulum weight is not the increase that is directly proportional with the raising of control effect.After it became certain value, along with the increase of pendulum weight, effectiveness in vibration suppression increased and is not obvious, and for transmission line, the total weight of gold utensil also has requirement.Thereby the weight ratio of pendulum and multi-body system generally is taken between 0.5% ~ 3%.The weight of actual 474m+474m span transmission line, the weight of swing ball should be between 8.5kg ~ 51kg, preferred 50kg.
Vibration isolator size design corresponding to table 1 control insulator string beat
| Pendulum quality/kg | Pendulum diameter/mm | Oscillating bar length/m | Fork diameter/mm |
| 25 | 182 | 4.25 | 26 |
| 50 | 230 | 1.52 | 26 |
| 60 | 244 | 1.31 | 26 |
Vibration isolator size design corresponding to table 2 control insulator string charming appearance and behaviour fracture
| Spheroid mass/kg | Sphere diameter/mm | Oscillating bar length/m | Fork diameter/mm |
| 25 | 182 | 0.68 | 26 |
| 50 | 230 | 0.38 | 26 |
| 60 | 244 | 0.34 | 26 |
Claims (5)
1. method for designing take control transmission circuit insulator string windburn as target, it is characterized in that, described method is based on the strong coupling effect of power transmission line and insulator string, foundation comprises the transmission line multi-body system FEM (finite element) model of power transmission line, insulator string, analyze the insulator string dynamic characteristic from system perspective, obtain its beat and vibration fundamental frequency, and as target, utilize vibration isolator FEM (finite element) model Optimized model size, finally rupture the windburn accident as target take control windage yaw and insulator string charming appearance and behaviour respectively, realize the optimal design of vibration isolator;
Said method comprising the steps of:
(1) sets up transmission line multi-body system Parameters of Finite Element model;
(1-1) nonlinear analysis and the constraint by suspension cable applies definite power transmission line original shape, sets up the power transmission line FEM (finite element) model;
(1-2) by Modal Parameters Identification, determine the insulator string material parameter by field test, set up the insulator string FEM (finite element) model;
(1-3) apply by boundary condition, set up the transmission line multi-body system Parameters of Finite Element model that comprises power transmission line, insulator string;
(2) transmission line multi-body system dynamic analysis;
For transmission line multi-body system FEM (finite element) model prestressed modal analysis is arranged, determine in the multi-body system insulator string beat and vibration fundamental frequency, vibration shape dynamic characteristic parameter;
(3) design of vibration isolator;
Adopt non-linear pendulum vibration isolator, set up the vibration isolator FEM (finite element) model, by Optimization Design respectively in the multi-body system insulator string beat and vibration fundamental frequency obtain the design of vibration isolator size as target;
(4) mounting design of vibration isolator;
By hinged mode non-linear pendulum vibration isolator is installed on the conductor spacer of circuit.
2. a kind of method for designing take the windburn of control transmission circuit insulator string as target according to claim 1 is characterized in that the power transmission line suspension cable can adopt catenary curve or parabola theories in the described step (1), and preferred catenary curve is theoretical.
3. a kind of method for designing take the windburn of control transmission circuit insulator string as target according to claim 1 is characterized in that the middle power transmission line of described step (1) can adopt 3D, and only tension member, 3D beam and cable elements carry out modeling.
4. according to claim 1 a kind of to prevent and treat the transmission circuit insulator string windburn as the method for designing of target, it is characterized in that insulator string comprises glass insulator strings, porcelain insulating substring and the composite insulator string that transmission line is commonly used in the described step (1).
5. according to claim 1 a kind of to prevent and treat the transmission circuit insulator string windburn as the method for designing of target, it is characterized in that, the described non-linear pendulum vibration isolator that adopts in the described step (3) is weight class vibration isolator, by changing pendulum weight, oscillating bar length, diameter parameters can change its natural frequency.
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| CN2012104530455A CN102916380A (en) | 2012-11-13 | 2012-11-13 | Design method aiming at preventing transmission line insulator string from being damaged by wind |
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| CN2012104530455A CN102916380A (en) | 2012-11-13 | 2012-11-13 | Design method aiming at preventing transmission line insulator string from being damaged by wind |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683086A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Method for electric transmission line windage yaw transient analysis under action of moving thunderstorm wind |
| CN105005660A (en) * | 2014-08-26 | 2015-10-28 | 国家电网公司 | Stress calculation method for non-linear flexible member close to practical running state |
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| CN102609574A (en) * | 2012-01-19 | 2012-07-25 | 武汉大学 | Virtual reality simulation platform system with overhead power transmission conductor galloping and galloping preventing designs |
| CN102623939A (en) * | 2012-02-06 | 2012-08-01 | 广东电网公司电力科学研究院 | Power transmission line wind vibration control method based on simulated random gust field calculation |
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2012
- 2012-11-13 CN CN2012104530455A patent/CN102916380A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102609574A (en) * | 2012-01-19 | 2012-07-25 | 武汉大学 | Virtual reality simulation platform system with overhead power transmission conductor galloping and galloping preventing designs |
| CN102623939A (en) * | 2012-02-06 | 2012-08-01 | 广东电网公司电力科学研究院 | Power transmission line wind vibration control method based on simulated random gust field calculation |
Non-Patent Citations (3)
| Title |
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| GIORGIO DIANA, MARCO BOCCIOLONE, FEDERICO CHELI, ALFREDO CIGADA: "《Large Wind-Induced Vibrations on Conductor Bundles: Laboratory Scale Measurements to Reproduce the Dynamic Behavior of the Spans and the Suspension Sets》", 《IEEE TRANSACTIONS ON POWER DELIVERY《LARGE WIND-INDUCED VIBRATIONS ON CONDUCTOR BUNDLES: LABORATORY SCALE MEASUREMENTS TO REPRODUCE THE DYNAMIC BEHAVIOR OF THE SPANS AND THE SUSPENSION SETS》》 * |
| 刘朋科: "《高压输电线路数值模拟中的参数化有限元法》", 29 October 2007 * |
| 邵天晓: "《架空送电线路的电线力学计算》", 30 April 1987 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683086A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Method for electric transmission line windage yaw transient analysis under action of moving thunderstorm wind |
| CN103683086B (en) * | 2013-12-17 | 2016-02-17 | 国家电网公司 | Power transmission circuit caused by windage transient state analyzing method under the effect of motion thunderstorm wind |
| CN105005660A (en) * | 2014-08-26 | 2015-10-28 | 国家电网公司 | Stress calculation method for non-linear flexible member close to practical running state |
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Application publication date: 20130206 |