CN209344514U - The device of steel tower tower head overvoltage when a kind of inhibition transmission line lightning stroke - Google Patents

The device of steel tower tower head overvoltage when a kind of inhibition transmission line lightning stroke Download PDF

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Publication number
CN209344514U
CN209344514U CN201822026688.7U CN201822026688U CN209344514U CN 209344514 U CN209344514 U CN 209344514U CN 201822026688 U CN201822026688 U CN 201822026688U CN 209344514 U CN209344514 U CN 209344514U
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CN
China
Prior art keywords
coaxial
steel tower
tower
overvoltage
transmission line
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Expired - Fee Related
Application number
CN201822026688.7U
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Chinese (zh)
Inventor
孔晓峰
方玉群
姜文东
虞驰
张健
江道灼
赵俊杰
贺燕
王斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jinhua Bada Group Co Ltd Science And Technology Information Branch
Zhejiang University ZJU
State Grid Zhejiang Electric Power Co Ltd
Jinhua Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
Jinhua Bada Group Co Ltd Science And Technology Information Branch
Zhejiang University ZJU
State Grid Zhejiang Electric Power Co Ltd
Jinhua Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Application filed by Jinhua Bada Group Co Ltd Science And Technology Information Branch, Zhejiang University ZJU, State Grid Zhejiang Electric Power Co Ltd, Jinhua Power Supply Co of State Grid Zhejiang Electric Power Co Ltd filed Critical Jinhua Bada Group Co Ltd Science And Technology Information Branch
Priority to CN201822026688.7U priority Critical patent/CN209344514U/en
Application granted granted Critical
Publication of CN209344514U publication Critical patent/CN209344514U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model relates to the high pressure anti-thunder technical field of power engineering transmission line of electricity, the device of steel tower tower head overvoltage when more particularly, to a kind of inhibition transmission line lightning stroke.The device of steel tower tower head overvoltage when a kind of inhibition transmission line lightning stroke, including coaxial-type aerial cable line, coaxial cable downlead, the ground arrester that steel tower bottom is arranged in and the grounded screen being arranged under steel tower bottomland being mounted at the top of steel tower, one end of the coaxial cable downlead is connected on coaxial-type aerial cable line, the other end of the coaxial-type cable downlead is connect with ground arrester, and the ground arrester is electrically connected with grounded screen.When can reduce lightning stroke trip accident and counterattack accident occur for the utility model.

Description

The device of steel tower tower head overvoltage when a kind of inhibition transmission line lightning stroke
Technical field
The utility model relates to the high pressure anti-thunder technical fields of power engineering transmission line of electricity, inhibit defeated more particularly, to a kind of The device of steel tower tower head overvoltage when electric line is struck by lightning.
Background technique
In recent years, since lightening activity is increasingly enhanced, route accident because of caused by lightning stroke is increasing, to the peace of route Row for the national games, which causes, to be seriously threatened, and the power supply reliability of power transmission sequence is seriously affected.The lightning protection measures of current power transmission route itself Rely primarily on the aerial earth wire for being erected at steel tower top, in operation and maintenance mainly to the detection of steel tower ground resistance and Transformation, due to the unicity of its lightning protection measures, is unable to reach lightning protection requirement.Since lightning stroke intensity is big, when lightning current is more than steel tower When resistance to thunder level, flashover will occur for the insulator chain of the steel tower, cause line tripping, this be line tripping will be because.
1, the problem of existing lightning conducter shocking preventing technology:
According to the observation of the viewpoint of high pressure research Suo Lipei state, China Electric Power Research Institute professor and former Soviet Union scholar It was found that lightning conducter can be caused when thunder and lightning hits the lightning conducter at the mid span position of transmission line of electricity --- phase conductor gap breakdown Electric discharge, and then cause line tripping, and it is not avoided that this electric discharge occurs using the negative shielding angle of lightning conducter.And it is it is thought that high The main reason for pressure transmission line lightning stroke trip generates.
Be believed that by analyzing above: existing lightning conducter is general model GJ-90~120mm with wire2, according to Known to " power engineering high voltage circuit design manual ":
The forward-sequence reactance calculation method of single conductor:
X1Unit be Ω/km
In upper two formula, μ is the relative permeability of conductor material, for aluminium A1 conductor μ=1, for steel μ=2000~ 4000, f be frequency;Hz;The f=10 of lightning current5Hz~106Hz;And the geometry of power frequency supply f=50Hz, Dm between phase conductor is equal Away from;Dab, dbc and dca are respectively distance between three-phase conducting wire;R is the radius of conducting wire;Re is the effective radius of conducting wire.
By analyze above it is found that when be struck by lightning lightning conducter on when due to the every kilometers length of steel wire conducting wire under generated reactance value Are as follows:
XL0.0001 π μ f/ Ω km of ≈, if taking μ=2000, f=5 × 105When Hz,
XL=10-4×3.14×2×103×5×105=3.14105Ω/km
When span is 400M, the reactance under 1/2 span length is XL1=0.2 × 3.14 × 105=6.28 × 104Ω, this A impedance value is very high impedance, if lightning current is 30KA, then the voltage accumulated on lightning conducter is, fixed according to ohm Restrain U=IR=U=6.28 × 104× 30KA=1.88 × 106KV, so high voltage, substantially can by lightning conducter with mutually lead The air gap breakdown between line, so as to cause tripping, this is also the theory that regular short circuit breakdown tripping fault occurs for lightning stroke Calculate reason for it.
2, the problem of being struck back about steel tower on lightning stroke route
It will cause to strike back after at the top of lightning stroke electric power line steel tower, tower top current potential Utop can be calculated by following formula:
Wherein Ri is steel tower impulse earthed resistance, and steel tower total inductance is indicated with Lt,Indicate lightning current steepness: β is to shunt Coefficient is by, as it can be seen that tower top current potential Utop consists of two parts, first item is to be caused by steel tower impulse resistance in above-mentioned formula;Section 2 It is the voltage that the variation of lightning current incudes on steel tower inductance.
Therefore when the route that is struck by lightning is struck back, with the raising of tower top current potential, the voltage that insulator is born also gradually increases Greatly, when voltage be more than tower insulation flashover voltage after, insulator is likely occurred edge flashing, even punctures, i.e., when lightning stroke in Steel tower top often occurs the counterattack accident of very high voltage, to solve the problems, such as counterattack it is necessary to reduce tower bar top current potential Utop, The prior art is usually to reduce ground resistance (generation of rosin joint should be avoided in earth mat construction, increase the ground network area), route installing The schemes such as coupling ground wire, but the effect generated is very poor.
Utility model content
The utility model provides one kind and trip accident and counterattack occurs when can reduce lightning stroke primarily directed to the above problem The device of steel tower tower head overvoltage when the inhibition transmission line lightning stroke of accident.
The purpose of this utility model is mainly to be achieved by following proposal: iron when a kind of inhibition transmission line lightning stroke The device of tower tower head overvoltage, including being mounted on coaxial-type aerial cable line at the top of steel tower, coaxial cable downlead, setting exist One end of the ground arrester of steel tower bottom and the grounded screen being arranged under steel tower bottomland, the coaxial cable downlead connects It connects on coaxial-type aerial cable line, the other end of the coaxial-type cable downlead is connect with ground arrester, described Ground arrester is electrically connected with grounded screen.Coaxial-type aerial cable line is mounted at the top of steel tower, and ground arrester is arranged in steel tower Bottom, grounded screen are arranged under steel tower bottomland, and one end of coaxial cable downlead is connected on coaxial-type aerial cable line, together The other end of shaft type cable downlead is connect with ground arrester, and ground arrester is electrically connected with grounded screen, when thunder and lightning is hit together When shaft type aerial cable line, lightning current passes sequentially through coaxial-type aerial cable line, coaxial cable downlead, ground arrester and connects Earth mat finally flows into underground.
Preferably, the coaxial-type aerial cable line includes interior core conductor, the insulating layer set gradually from inside to outside And outer contact.Coaxial-type aerial cable line includes interior core conductor, insulating layer and the outer contact set gradually from inside to outside, this Sample designs so that when coaxial-type aerial cable line is by being struck by lightning, and lightning current can be made to run through, and on aerial earth wire outer layer The leading role of downlink is presented, that is, connects the equipotential value with the earth, forms apparent potential difference with phase conductor, promote thunder and lightning Flow rate is first discharged to the outer contact of aerial earth wire, to reach the lightning protection purpose prevented on thunderbolt to electrification phase line.
Preferably, the interior core conductor is made of steel wire, the outer contact is made of aluminum foil material.Inner core is led Body is made of steel wire, and outer contact is made of aluminum foil material, at low cost, and can play effective electric action.
Preferably, the coaxial cable downlead include the polyvinyl chloride filled core set gradually from inside to outside, it is interior Portion's conductor layer, cross-linked polrvinyl chloride layer, external conductor layer and polyvinyl chloride outer shell.Coaxial cable downlead include from inside to outside according to Polyvinyl chloride filled core, internal conductor layer, cross-linked polrvinyl chloride layer, external conductor layer and the polyvinyl chloride outer shell of secondary setting, this Structure designs the low wave impedance characteristic for foring downlead, and when lightning stroke line steel tower occurs, powerful thunder energy must be fast It is transmitted in the grounded screen of underground fastly, could safely disappear thunder, and coaxial cable downlead designs the height that can be carried to thunder and lightning in this way Pressure high current has extremely strong tolerance to ensure not generate side to adjacent object and dodge electric discharge.
Preferably, the ground arrester is Zinc-Oxide Arrester.Ground arrester is Zinc-Oxide Arrester, works as thunder When voltage Intruding wave is more than the breakdown strength of portable protective gaps, gap is breakdown, limits the Overvoltage Amplitude of intrusion electrical equipment, After the Intruding wave past, the dielectric strength in gap can voluntarily be restored, so that electrical equipment can continue to run, Zinc-Oxide Arrester There is the stronger ability for restoring dielectric strength than general gap.
Therefore, when a kind of inhibition transmission line lightning stroke of the utility model the device of steel tower tower head overvoltage have it is following excellent Point: the utility model replaces the wire of original aerial earth wire with coaxial-type aerial cable line, meanwhile, with coaxial cable downlead Introducing ground is carried out as in the personal of iron tower of power transmission line, then coaxial cable downlead is connect with ground arrester, then will Ground arrester leads to the process of grounded screen, and tower head electric discharge, insulator arc-over flashover can be greatly reduced by this method by connecting Failure, thus reduce route lightning stroke trip-out rate, improve power supply reliability;The design of coaxial-type aerial cable line can be to make When lightning conducter is by being struck by lightning, do not puncture the air gap, reduces the generation of the accident of short circuit tripping;The design of coaxial cable downlead The generation of counterattack accident can be reduced;The ground arrester device for being used to receive thunder energy of setting in steel tower bottom, can So that route Lightning disservice caused by present weakens significantly.
Detailed description of the invention
Attached drawing 1 is the structural schematic diagram of the utility model.
Attached drawing 2 is the structural schematic diagram of coaxial-type aerial cable line in the utility model.
Attached drawing 3 is the cross-sectional view of the utility model standard coaxial cable downlead.
Attached drawing 4 is the structural schematic diagram of ground arrester in the utility model.
It illustrates: 1- coaxial-type aerial cable line, 2- coaxial cable downlead, the ground 3- arrester, 4- grounded screen, 5- Polyvinyl chloride filled core, 6- internal conductor layer, 7- cross-linked polrvinyl chloride layer, 8- external conductor layer, 9- polyvinyl chloride outer shell, 1-1- Interior core conductor, 1-2- insulating layer, 1-3- outer contact.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment 1:
As shown in Figure 1, a kind of device of steel tower tower head overvoltage when inhibiting transmission line lightning stroke, including is mounted on steel tower top Coaxial-type aerial cable line 1, coaxial cable downlead 2, the ground arrester 3 that steel tower bottom is arranged in and the setting in portion are in steel tower Grounded screen 4 under bottomland, one end of coaxial cable downlead 2 are connected on coaxial-type aerial cable line 1, and coaxial-type cable draws The offline other end is connect with ground arrester 3, and ground arrester 3 is electrically connected with grounded screen 4, and the one of coaxial cable downlead 2 End is connected on coaxial-type aerial cable line 1, and the other end of coaxial-type cable downlead is connect with ground arrester 3, and ground is kept away Thunder device 3 is electrically connected with grounded screen 4, and when thunder and lightning hits coaxial-type aerial cable line 1, lightning current passes sequentially through the aerial electricity of coaxial-type Cable 1, coaxial cable downlead 2, ground arrester 3 and grounded screen 4, finally flow into underground.
As shown in Fig. 2, coaxial-type aerial cable line 1 includes interior core conductor 1-1, the insulating layer 1- set gradually from inside to outside 2 and outer contact 1-3, in this way design so that lightning current can be made to run through when coaxial-type aerial cable line 1 is by being struck by lightning, And the leading role of downlink is presented on aerial earth wire outer layer, that is, the equipotential value with the earth is connected, is formed obviously with phase conductor Potential difference, promote lightning current take the lead in the outer contact 1-3 of aerial earth wire discharge, so that reaching prevents thunderbolt to band Lightning protection purpose in electric phase line;Interior core conductor 1-1 is made of steel wire, and outer contact 1-3 is made of aluminum foil material, at low cost, and Effective electric action can be played.
As shown in figure 3, coaxial cable downlead 2 includes that the polyvinyl chloride filled core 5 that sets gradually from inside to outside, inside are led Body layer 6, cross-linked polrvinyl chloride layer 7, external conductor layer 8 and polyvinyl chloride outer shell 9, this structure design the low wave for foring downlead Impedance operator, when lightning stroke line steel tower occurs, powerful thunder energy must be rapidly transmitted in underground grounded screen 4, Can safely be disappeared thunder, and the design in this way of coaxial cable downlead 2 can have extremely strong tolerance energy to the high pressure high current that thunder and lightning carries Power dodges electric discharge to ensure not generate side to adjacent object.
As shown in figure 4, ground arrester 3 is Zinc-Oxide Arrester, when lightning voltage Intruding wave is more than the breakdown of portable protective gaps When intensity, gap is breakdown, limits the Overvoltage Amplitude of intrusion electrical equipment, after the Intruding wave past, the insulation in gap is strong Degree can voluntarily restore, so that electrical equipment can continue to run, Zinc-Oxide Arrester has stronger restore absolutely than general gap The ability of edge intensity.
It should be understood that the embodiment is merely to illustrate the utility model rather than limitation the scope of the utility model.Furthermore It should be understood that after reading the content taught by the present invention, those skilled in the art can make the utility model various Change or modification, these equivalent forms also fall within the scope of the appended claims of the present application.

Claims (5)

1. the device of steel tower tower head overvoltage when a kind of inhibition transmission line lightning stroke, which is characterized in that including being mounted on steel tower top Coaxial-type aerial cable line, coaxial cable downlead, the ground arrester that steel tower bottom is arranged in and the setting in portion are at steel tower bottom One end of the grounded screen of portion underground, the coaxial cable downlead is connected on coaxial-type aerial cable line, and described is coaxial The other end of formula cable downlead is connect with ground arrester, and the ground arrester is electrically connected with grounded screen.
2. the device of steel tower tower head overvoltage, feature exist when a kind of inhibition transmission line lightning stroke according to claim 1 In the coaxial-type aerial cable line includes interior core conductor, insulating layer and the outer contact set gradually from inside to outside.
3. the device of steel tower tower head overvoltage, feature exist when a kind of inhibition transmission line lightning stroke according to claim 2 In the interior core conductor is made of steel wire, and the outer contact is made of aluminum foil material.
4. the device of steel tower tower head overvoltage, feature when a kind of inhibition transmission line lightning stroke according to claim 1 or 2 It is, the coaxial cable downlead includes the polyvinyl chloride filled core set gradually from inside to outside, internal conductor layer, crosslinking Polyvinyl chloride layer, external conductor layer and polyvinyl chloride outer shell.
5. the device of steel tower tower head overvoltage when a kind of inhibition transmission line lightning stroke according to claim 1 or 2 or 3, It is characterized in that, the ground arrester is Zinc-Oxide Arrester.
CN201822026688.7U 2018-12-04 2018-12-04 The device of steel tower tower head overvoltage when a kind of inhibition transmission line lightning stroke Expired - Fee Related CN209344514U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201822026688.7U CN209344514U (en) 2018-12-04 2018-12-04 The device of steel tower tower head overvoltage when a kind of inhibition transmission line lightning stroke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201822026688.7U CN209344514U (en) 2018-12-04 2018-12-04 The device of steel tower tower head overvoltage when a kind of inhibition transmission line lightning stroke

Publications (1)

Publication Number Publication Date
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112186700A (en) * 2020-09-27 2021-01-05 秦锦峰 Lightning protection method for power transmission line
CN113193484A (en) * 2021-04-30 2021-07-30 广东电网有限责任公司湛江供电局 Lightning device for overhead line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112186700A (en) * 2020-09-27 2021-01-05 秦锦峰 Lightning protection method for power transmission line
CN113193484A (en) * 2021-04-30 2021-07-30 广东电网有限责任公司湛江供电局 Lightning device for overhead line

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Granted publication date: 20190903

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