CN104006733A - Method for determining distance between down lead buried framework and bottom-phase cross arm of tower - Google Patents
Method for determining distance between down lead buried framework and bottom-phase cross arm of tower Download PDFInfo
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- CN104006733A CN104006733A CN201410246641.5A CN201410246641A CN104006733A CN 104006733 A CN104006733 A CN 104006733A CN 201410246641 A CN201410246641 A CN 201410246641A CN 104006733 A CN104006733 A CN 104006733A
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Abstract
The invention discloses a method for determining the distance between a down lead buried framework and a bottom-phase cross arm of a tower. The method sequentially includes the following steps that the distance between the down lead buried framework and the bottom-phase cross arm is larger than or equal to the vertical interlayer space of a wire, lightning is exerted between a test wire and a down lead 20 or 40 times to impact test voltage, whether the lightning impulse flashover path is along an air interval between the down lead and the test wire every time or not is examined, if yes, the distance is decreased by a step length, the test continues in the same mode until the lightning impulse flashover path is not along the air interval between the down lead and the test wire every time, then the test is carried out by increasing the distance by half a step length, if the lightning impulse flashover path is along the air interval between the down lead and the test wire every time, the distance is the minimum distance, and if the lightning impulse flashover path is not along the air interval between the down lead and the test wire every time, the minimum distance is the sum of the distance and half a step length. The method has the advantages that erosion to the tower body or the cross arm part of the tower made of composite materials from the lightning impulse flashover discharge is avoided to the maximum extent in the test process, and the test method is simple and easy in operation and implementation.
Description
Technical field
The present invention relates to a kind of definite method that tower grounding downlead enters ground framework and lower phase cross-arm distance, specifically, relate to composite material pole tower down conductor under the grounding lead of a kind of inner side enter definite method of framework and lower phase cross-arm distance.
Background technology
Shaft tower is the visual plant of transmission line of electricity, and it uses properties of materials directly to have influence on security, economy and the reliability of circuit operation.Due to steel, to have strength-weight ratio high, easily processes and the advantage such as installation, mostly adopts at present all steel material shaft tower both at home and abroad.But also there is the self shortcomings such as quality large (steel density is higher), easy-to-rust in all steel shaft tower, so need to drop into larger man power and material in shaft tower construction transportation and aspect safeguarding.
In recent years, along with the energetically promotion of country to electric power science and technology, Southern Power Grid Company and State Grid Corporation of China have successively set up the composite material pole tower scientific research project of a plurality of incorporation engineerings, attempt promoting composite material pole tower at the application and development of electric system, utilize compound substance have lightweight, intensity is large, corrosion-resistant, high-low temperature resistant, excellent in durability and the feature such as insulativity is strong, to reduce overhead line structures transportation and maintenance cost, the electric failure rate of circuit etc., comprehensively improve economy and the safe reliability of circuit.
Patent No. ZL2010102283469 < < method for vertical grounding down leading on inner side of composite material tower by name and shaft tower > > thereof have solved the Lightning Protection of composite material pole tower.The situation of most " the half composite structure composite material pole towers " that combine for the first half compound material insulation tower head and the latter half metal tower body of current composite material pole tower, on ground wire metal cross arm perpendicular bisector, set up one section of certain length metal down conductor framework, and vertically draw down conductor at this framework end, then down conductor be connected to shaft tower bottom down conductor enter ground framework on, this enter ground framework be connected with shaft tower the latter half metal tower body, by metal tower body ground connection.The object of this grounding down-leading formula be by down conductor with insulation tower body maintain a certain distance d, thereby guarantee lightning stroke flashover path by down conductor directly to wire and without compound cross-arm.This patented method needs to determine two key parameters in using use procedure: the one, and the distance of down conductor and insulation tower body, the 2nd, the lightning impulse dielectric strength of shaft tower.These two parameters are all that the lightning impulse test by true type insulation tower head obtains definite.
But in the process of the lightning impulse test of the actual true type insulation tower head of lattice composite material pole tower, when down conductor enters ground framework with lower phase cross-arm distance too closely time, discharge path has passed through tower body.The bolt at lattice composite material pole tower tower body tie point place all adopts metal bolts, and remainder all adopts compound substance (insulating material), and electric discharge, after tower body, has left electric discharge scar near metal bolts.In actual moving process, after lightning stroke flashover, can there is power frequency continued flow, make the result of the hazard ratio testing laboratory of lightning stroke flashover want much serious.So in process of the test, should enter ground framework and lower phase cross-arm distance by regulated ground downlead, make the path of lightning impulse electric discharge can not pass through tower body.Therefore, how by test, to determine that down conductor enters ground framework and lower phase cross-arm distance, being needs research and absorbed problem emphatically.
Summary of the invention
The object of the present invention is to provide a kind of tower grounding downlead to enter definite method of ground framework and lower phase cross-arm distance, can effectively solve determine how fast down conductor enter the problem of framework and lower phase cross-arm distance.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions: a kind of tower grounding downlead enters definite method of ground framework and lower phase cross-arm distance, comprises the following steps successively:
A. down conductor enter ground framework with lower phase cross-arm apart from being more than or equal to wire vertical inter-layer distance, and between test lead and down conductor, apply 20 times or 40 lightning impulse test voltages, check that whether each lightning impulse flashover path is all along the clearance between down conductor and test lead, if it is carries out next step;
B. adjust down conductor and enter ground framework and lower cross-arm distance, reduce by a step-length, between test lead and down conductor, apply 20 times or 40 lightning impulse test voltages, check whether each lightning impulse flashover path is all along the clearance between down conductor and test lead;
If it is repeating step B, until occur that lightning impulse flashover path is not along the airspace between down conductor and test lead;
C. occurring that lightning impulse flashover path is not behind the airspace between down conductor and test lead, down conductor is entered to ground framework and lower cross-arm apart from half step-length of increase, between test lead and down conductor, apply 20 times or 40 lightning impulse test voltages;
If lightning impulse flashover path is not also along the airspace between down conductor and test lead, down conductor enter ground framework and lower phase cross-arm distance for lightning impulse flashover path in step B during along clearance between down conductor and test lead the shortest distance between downlead and test lead;
If lightning impulse flashover path is along the airspace between down conductor and test lead, down conductor when down conductor enters ground framework and tests for step C with lower phase cross-arm distance enter framework and lower phase cross-arm distance.
Preferably, a described step-length is 50cm; Consider error in practice of construction and the length of a given step-length, the too short construction error of cannot offsetting of length, length is long cannot obtain distance comparatively accurately.
Compared with prior art, advantage of the present invention is: (1) has avoided lightning impulse flashover in process of the test to discharge to the ablation of composite material pole tower tower body or cross-arm part (owing to there is no power frequency continued flow after lightning flash in process of the test to greatest extent, partly there is flashover one time in composite material pole tower tower body or cross-arm, generally can not cause essence damage to its insulation, repeatedly will bring essence damage or hidden danger), increased the confidence level of test findings;
And then avoided changing test material cost that test test product brings and the lifting of time cost (2);
(3) test method scheme is simple and clear, and easy operating is carried out;
(4) step-length of selecting in test has been considered the error range in practice of construction.
Accompanying drawing explanation
Consult the schematic diagram that a kind of tower grounding downlead of Fig. 1 enters ground framework and definite method of lower phase cross-arm distance.
Embodiment
Consult Fig. 1, a kind of tower grounding downlead enters definite method of ground framework and lower phase cross-arm distance, comprises the following steps successively:
A. down conductor enter ground framework 1 with lower phase cross-arm 2 apart from equaling wire perpendicular layers space D
1a step-length is 50cm, and between test lead and down conductor, apply 20 times or 40 lightning impulse test voltages, check that whether each lightning impulse flashover path is all along the clearance between down conductor and test lead, if it is carries out next step; If continue above-mentioned experiment otherwise lengthen half step-length L, until each lightning impulse flashover path is all along the clearance between down conductor and test lead, this distance is that final down conductor enters ground framework and lower phase cross-arm distance;
B. adjust down conductor and enter ground framework and lower cross-arm distance, reduce by a step-length L, it is D with lower phase cross-arm distance that down conductor now enters ground framework
1-L applies 20 times or 40 lightning impulse test voltages between test lead and down conductor, checks whether each lightning impulse flashover path is all along the clearance between down conductor and test lead;
If it is repeating step B, until occur that lightning impulse flashover path is not along the airspace between down conductor and test lead, it is D with lower phase cross-arm distance that down conductor now enters ground framework
1-nL, n adjusts the number of times that down conductor enters ground framework and lower phase cross-arm distance in step B, and the n in following steps is also identical meanings;
C. occurring that lightning impulse flashover path is not behind the airspace between down conductor and test lead, down conductor entered to ground framework and lower cross-arm apart from increasing by half step-length, down conductor now enter ground framework with lower phase cross-arm apart from being D
1-nL+0.5L applies 20 times or 40 lightning impulse test voltages between test lead and down conductor;
If lightning impulse flashover path is not also along the airspace between down conductor and test lead, down conductor enter ground framework and lower phase cross-arm distance for lightning impulse flashover path in step B during along clearance between down conductor and test lead the shortest distance between downlead and test lead, be D
1-nL;
If lightning impulse flashover path is along the airspace between down conductor and test lead, down conductor when down conductor enters ground framework and tests for step C with lower phase cross-arm distance enter framework and lower phase cross-arm distance, be D
1-nL+0.5L.
Adopt said method to determine that down conductor enters ground framework and lower phase cross-arm distance, avoided to greatest extent lightning impulse flashover in process of the test to discharge to the ablation of composite material pole tower tower body or cross-arm part (owing to there is no power frequency continued flow after lightning flash in process of the test, partly there is flashover one time in composite material pole tower tower body or cross-arm, generally can not cause essence damage to its insulation, repeatedly will bring essence damage or hidden danger), increased the confidence level of test findings, and then test material cost that test test product brings and the lifting of time cost have been avoided changing, this test method scheme is simple and clear, and easy operating is carried out, and the step-length of selecting in test has been considered the error range in practice of construction.
The foregoing is only specific embodiments of the invention, but technical characterictic of the present invention is not limited to this, any those skilled in the art is in the field of the invention, and the variation of doing or modification are all encompassed among the scope of the claims of the present invention.
Claims (2)
1. tower grounding downlead enters a definite method for ground framework and lower phase cross-arm distance, it is characterized in that: comprise the following steps successively:
A. down conductor enter ground framework with lower phase cross-arm apart from being more than or equal to wire vertical inter-layer distance, and between test lead and down conductor, apply 20 times or 40 lightning impulse test voltages, check that whether each lightning impulse flashover path is all along the clearance between down conductor and test lead, if it is carries out next step;
B. adjust down conductor and enter ground framework and lower cross-arm distance, reduce by a step-length, between test lead and down conductor, apply 20 times or 40 lightning impulse test voltages, check whether each lightning impulse flashover path is all along the clearance between down conductor and test lead;
If it is repeating step B, until occur that lightning impulse flashover path is not along the airspace between down conductor and test lead;
C. occurring that lightning impulse flashover path is not behind the airspace between down conductor and test lead, down conductor is entered to ground framework and lower cross-arm apart from half step-length of increase, between test lead and down conductor, apply 20 times or 40 lightning impulse test voltages;
If lightning impulse flashover path is not also along the airspace between down conductor and test lead, down conductor enter ground framework and lower phase cross-arm distance for lightning impulse flashover path in step B during along clearance between down conductor and test lead the shortest distance between downlead and test lead;
If lightning impulse flashover path is along the airspace between down conductor and test lead, down conductor when down conductor enters ground framework and tests for step C with lower phase cross-arm distance enter framework and lower phase cross-arm distance.
2. a kind of tower grounding downlead as claimed in claim 1 enters definite method of ground framework and lower phase cross-arm distance, it is characterized in that: a described step-length is 50cm.
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104298833A (en) * | 2014-10-30 | 2015-01-21 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for generating lightning stroke simulation model of combined type composite tower |
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| US20080270052A1 (en) * | 2007-03-07 | 2008-10-30 | Airbus France | Device and method for detecting lightning strikes on a structure made of electrically insulating material |
| CN101741043A (en) * | 2010-01-25 | 2010-06-16 | 广东电网公司深圳供电局 | Method for vertical grounding down leading on inner side of composite material tower and tower |
| CN201507140U (en) * | 2009-09-25 | 2010-06-16 | 国网电力科学研究院 | Composite material pole tower |
| CN101752819A (en) * | 2010-01-28 | 2010-06-23 | 国网电力科学研究院 | Method for vertical grounding led-down outside composite material pole tower and pole tower thereof |
| CN202042864U (en) * | 2011-01-24 | 2011-11-16 | 国网电力科学研究院 | Unbalance insulation earthing device for half-composite pole tower |
| CN202949190U (en) * | 2012-11-28 | 2013-05-22 | 南方电网科学研究院有限责任公司 | Shielding line for inhibiting ground composite field intensity below high-voltage direct current lines |
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2014
- 2014-06-05 CN CN201410246641.5A patent/CN104006733B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080270052A1 (en) * | 2007-03-07 | 2008-10-30 | Airbus France | Device and method for detecting lightning strikes on a structure made of electrically insulating material |
| CN201507140U (en) * | 2009-09-25 | 2010-06-16 | 国网电力科学研究院 | Composite material pole tower |
| CN101741043A (en) * | 2010-01-25 | 2010-06-16 | 广东电网公司深圳供电局 | Method for vertical grounding down leading on inner side of composite material tower and tower |
| CN101752819A (en) * | 2010-01-28 | 2010-06-23 | 国网电力科学研究院 | Method for vertical grounding led-down outside composite material pole tower and pole tower thereof |
| CN202042864U (en) * | 2011-01-24 | 2011-11-16 | 国网电力科学研究院 | Unbalance insulation earthing device for half-composite pole tower |
| CN202949190U (en) * | 2012-11-28 | 2013-05-22 | 南方电网科学研究院有限责任公司 | Shielding line for inhibiting ground composite field intensity below high-voltage direct current lines |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104298833A (en) * | 2014-10-30 | 2015-01-21 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for generating lightning stroke simulation model of combined type composite tower |
| CN104298833B (en) * | 2014-10-30 | 2016-04-13 | 国网电力科学研究院武汉南瑞有限责任公司 | Combined type composite material shaft tower lightning stroke simulation model generation method |
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