CN107068285B - It is a kind of can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver - Google Patents

It is a kind of can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver Download PDF

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CN107068285B
CN107068285B CN201611032689.1A CN201611032689A CN107068285B CN 107068285 B CN107068285 B CN 107068285B CN 201611032689 A CN201611032689 A CN 201611032689A CN 107068285 B CN107068285 B CN 107068285B
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layer
wire
ground wire
insulating
ice
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CN107068285A (en
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张健
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张华�
许钧
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00Power cables
    • H01B9/008Power cables for overhead application
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/02Disposition of insulation
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/30Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying alternating current, e.g. due to skin effect

Abstract

The present invention relates to it is a kind of can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver.Present invention aim to address the icing problems of aerial earth wire, not only realize ice-melt snow removing with the smallest cost input, protection transmission of electricity phase line can not also be damaged in lightning stroke or when line fault occurs, and aerial earth wire itself is also intact.The technical scheme is that the ground wire is followed successively by layer in electroconductive magnetic body, composite insulation layer and electroconductive magnetic volume surrounding from inside to outside, in which: layer is formed by more zinc-coated wire process in the electroconductive magnetic body;The composite insulation layer is by inner insulating layer, main insulating layer and insulating outer layer is laminating forms, and wherein inner insulating layer and insulating outer layer are semi-conductive layer;The electroconductive magnetic volume surrounding is formed by more zinc-coated wire process, is coated on the outside of insulating outer layer.The zinc-coated wire uses soft magnetism wire galvanization.The present invention is suitable for the lightning protection and ice-melt of electric system mesohigh overhead transmission line ground wire.

Description

It is a kind of can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver
Technical field
The present invention relates to it is a kind of can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver.It is aerial suitable for electric system mesohigh The lightning protection and ice-melt of earth wire of power transmission line.
Background technique
Since 2008, there is low temperature sleet rarely seen in the history and congeals disaster in southern region of China.Many routes cover Ice causes large area broken string or tower far beyond route ability to bear.It is usually solid for being erected at the ground wire above transmission line of electricity Be scheduled on the tower top of line steel tower, during icing, power line conductive, ground wire can icing, due to aerial earth wire be higher than conducting wire, and And aerial earth wire does not have electric current to flow through under transmission line of electricity normal operation, the ice covering thickness of aerial earth wire is often led than transmission of electricity Line also wants thick (generally its ice covering thickness is 5~10mm thicker than conducting wire under identical meteorological condition).If only solving on conducting wire Icing, one side wire icing melt after arc sag will rise, lead, the distance of ground wire reduce, when icing is serious even will appear Ground wire is lower than the case where conducting wire, cause to lead, ground wire electrical distance deficiency influence route operate normally or conducting wire deice after produce Life, which is jumped, to be caused to lead in deicing processes, ground wire flashover;On the other hand, ground wire icing may also seriously cause ground wire upper frame or steel tower Situations such as deformation of top stretch bending, shaft tower inclination, equally will cause route and be unable to operate normally.
Therefore, if only carrying out ice-melt to phase conductor, still it is difficult to ensure that line security is run, it is necessary to also carry out to ground wire Ice-melt.Current way is to carry out Insulation Transformation to whole ground wires in ice-melt area, installs the insulator 4 of band gap additional on ground wire (as shown in Figure 2 and Figure 3) cuts off the electrical connection between shaft tower 5 and ground wire.When ice-melt, power end substation adds aerial earth wire Ice melting current is carried, substation is shorted two ground wires directly in opposite side, and ice melting current is formed into a loop by aerial earth wire, leads ground wire Body fever ice-melt snow, as shown in Figure 1.But this method is implemented and is had the following problems:
1), since ground wire is mostly by tower ground connection or graded insulation one point earth, in actual operation, discovery is exhausted For edge 4 under the conditions of icing, insulator average flashover severity voltage is respectively 12.6~13.5kV when ice covering thickness is 10mm and 20mm With 9.0~12.0kV, far below cleaning insulator average flashover severity voltage (24.6~28.5kV), it is seen then that covering ice for insulator and Its flashover voltage can all be reduced by staining.
2), in the case where aerial earth wire completely insulate (shown in Fig. 1), if the air gap of insulator 4 is 100mm, when Be struck by lightning ground wire and when the not breakdown the air gap, it is possible to find be greater than ground wire in the overvoltage of tower top at this time and shaft tower 5 be normal Overvoltage when connection, especially in the wave head part of over-voltage waveform.The reason is that due to the air between ground wire and shaft tower Gap does not puncture, and thunder energy postponement discharges downwards bigly, so that overvoltage wave head part steepening, overvoltage degree mention It is high.
3) it can be induced, in thunder and lightning descending leader into transmission line of electricity development process, on ground wire different with thunder and lightning descending leader The charge of property, to maintain the ground potential (zero potential) of ground wire.In ground wire by under tower grounding requirement, the heterocharge on ground wire is main It is to be fed via adjacent gear away from shaft tower, this process generally only has 2 μ s or so, develops to the ground far below thunder and lightning descending leader Required time (i.e. tens of microseconds even the stepped leader process of hundreds of microseconds).Correlative study shows the induction on ground wire Charge has great influence to the formation of ground wire upward leader, so that influence ground wire draws Lei Nengli.And it completely insulate in ground wire Under the conditions of, the charge inducing on ground wire can reduce, i.e. all fronts insulation of ground wire will affect the induction aggregation of ground wire, and lead to ground wire Lightning protection capability is poor.
4), power department is to reduce the electric energy loss on ground wire, if by ground wire all insulation, under this mode of connection, frame Field strength on the line of vacant lot can be less than the electric field strength on transmission pressure, when thunder and lightning downlink arrives first, if cannot puncture aerial earth wire The air gap between shaft tower makes ground wire grounded, since the electric field strength on transmission pressure at this time is greater than ground wire field strength, makes Transmission pressure will become head-on guide, generate lightning stroke shielding, cause transmission line malfunction, can produce to system safe and stable operation Raw larger impact.
Conducting wire is struck back to prevent from falling in the thunder on ground wire due to the above reasons, is arranged again manually in the season of not icing Again minefield ground wire is restored to be grounded, the line upkeep workload of this process is very huge.
Summary of the invention
The technical problem to be solved by the present invention is provide it is a kind of can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver, master Syllabus is the icing for solving the problems, such as aerial earth wire, not only realizes ice-melt snow removing with the smallest cost input, can also be in lightning stroke Or protection transmission of electricity phase line is not damaged when line fault generation, and aerial earth wire itself is also intact.
The technical scheme adopted by the invention is that: can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver, which is characterized in that institute It states ground wire and is followed successively by layer in electroconductive magnetic body, composite insulation layer and electroconductive magnetic volume surrounding from inside to outside, in which:
Layer is formed by more zinc-coated wire process in the electroconductive magnetic body;
The composite insulation layer is by inner insulating layer, main insulating layer and insulating outer layer is laminating forms, wherein inner insulating layer and absolutely Edge outer layer is semi-conductive layer;
The electroconductive magnetic volume surrounding is formed by more zinc-coated wire process, is coated on the outside of insulating outer layer.
The zinc-coated wire uses soft magnetism wire galvanization.
The conductor cross sectional area of layer and electroconductive magnetic volume surrounding is not less than 50mm in the electroconductive magnetic body2
The semi-conductive layer is prepared with a thickness of 1~3mm, the raw material of semi-conductive layer by following weight %:
Graphite 10~20
Iron powder 5~10
Crosslinked polyethylene surplus.
The main insulating layer is prepared with a thickness of 3~25mm, the raw material of main insulating layer by following weight %:
MgZn ferrite powder 20~30
Crosslinked polyethylene surplus.
The beneficial effects of the present invention are:
1, the present invention utilizes outer contact and inner conductor mutual induction principle, using composite insulation layer as insulating carrier Outer layer conductor is hanging over the ground, cut off the current path between ground wire and the earth.Under normal circumstances, ground wire outer contact and bar Tower insulation, can save energy decreasing loss, remarkable in economical benefits;When lightning surge occurs or when line fault, the ground wire is except through hitting The air gap of insulator is worn to outside the earth release electric energy, it can also hf channel caused by the capacitor layers structure by the ground wire It is connected with the earth magnetic circuit, realizes the automatic removal of mines.
2, secondary arc current is reduced, the reliability of power supply is improved, improves the success rate of single-pole reclosing, it is reliable to improve power grid Property.
3, solve the problems, such as that field takes electric difficulty to transmission line of electricity monitoring device in operation.
Detailed description of the invention
Fig. 1 is the schematic diagram that background of invention carries out ice-melt to ground wire.
Fig. 2, Fig. 3 are the structure chart of the two kinds of model insulators used when background technique ice-melt respectively.
Fig. 4 is the sectional view of ground wire of the present invention.
Fig. 5 is the three-dimensional internal anatomy of ground wire of the present invention.
Specific embodiment
As shown in Figure 4, Figure 5, the present embodiment can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver by three-decker cover it is multiple and At being followed successively by layer 1 in electroconductive magnetic body, composite insulation layer 2 and electroconductive magnetic volume surrounding 3 from inside to outside.
Layer 1 is formed by more zinc-coated wire process and (is used stranding machine process) in the electroconductive magnetic body, because requiring magnetic conduction It needs, zinc-coated wire is zinc-plated using soft magnetism wire galvanization or martensitic stainless steel wire.Layer 1 leads in the electroconductive magnetic body Body section product is no less than 50mm2
The composite insulation layer 2 is by inner insulating layer 2-1, main insulating layer 2-2 and insulating outer layer 2-3 is laminating forms, wherein Inner insulating layer 2-1 and insulating outer layer 2-3 is semi-conductive layer.Composite insulation layer realizes that equipment includes squeezing by the way of extruding Molding machine, rubber extruding machine, crosslinking apparatus and other auxiliary devices are the equipment and technique of existing maturation in the market.
Two layers semi-conductive layer with a thickness of 1~3mm, the raw material of semi-conductive layer by graphite 10~20 (weight %), iron powder 5~ 10 (weight %), remaining is formulated for crosslinked polyethylene.
The main insulating layer 2-2 is with a thickness of 3~25mm, and the raw material of main insulating layer is by (the weight of MgZn ferrite powder 20~30 Measure %), remaining is formulated for crosslinked polyethylene.
The electroconductive magnetic volume surrounding 3 be also by more zinc-coated wire process into (tube-type line strander process can be used, if Standby and technique is the prior art), this example electroconductive magnetic volume surrounding 3 shares two layers, is coated on the outside of insulating outer layer 2-3.Plating Zinc steel wire is zinc-plated using soft magnetism wire galvanization or martensitic stainless steel wire.The conductor cross sectional area of electroconductive magnetic volume surrounding 3 is wanted It asks not less than 50mm2
The present invention adds the composite insulation layer of intermediate course by dual-layer metal line, mutual with inner conductor using outer contact Principle of induction, it is using composite insulation layer as insulating carrier that outer layer conductor is hanging over the ground, ground wire and the earth are shut off in this way Between current path.Under normal circumstances, ground wire outer contact and bar (iron) tower insulate, when lightning surge generation or route event When barrier, aerial earth wire can lead to outside ground discharge, while also except through puncturing the air gap of insulator (installing) It crosses hf channel caused by capacitor layers structure designed by this cable earth wire and is connected with the earth through magnetic circuit, it is automatic to remove mines, guarantee Lightning current is effectively released.
Working principle of the present invention is as follows:
Since ground wire of the invention increases a composite insulation layer 2 between two layers of electroconductive magnetic body, in this way in physics A capacitor layers are formed in structure, according to the theoretical calculation of plate condenser, capacitanceε is Jie of air Electric constant, εrFor the dielectric constant of medium, it is the thickness of insulating layer in this programme that S, which is area, and d is the distance between conductor δ, i.e. the conductor spacing d=δ of capacitor with insulating layer are usually in this way 30~100kV pressure resistance design, insulating layer is generally 6~ 20mm thickness, if pressing the capacitance of this structure lower wire, usually with the capacitance of the left and right every kilometer of 0.2 μ F (microfarad), if conducting wire Continuous length be 10~20 kilometers when, capacitance can reach the capacitor of 4~5 μ F.It is in the case where transmission line of electricity is very long, then electric Capacitance increases accordingly, since lightning current is a kind of high-frequency impulse wave, usual f=1~100kHZBetween, it is easy to pass through Capacitive electrical component, the ground wire of such structure, which is equivalent to, provides an energy transmission to the lightning wave with high frequency characteristics Channel.
If capacitance C is every kilometers length up to 0.2 μ F, if ground line length is 50km, capacitance up to 10 μ F, And the capacitive reactance that thus capacitance is formedWhen lightning current frequency f is 10kHZWhen, the capacitive resistance of ground wire presentation Resist and isThis resistance value is the equal of one good Electric path, it can quickly drain lightning current in greatly in the channel constituted from this capacitor.However the ground wire is electric Cable is to 50HZCapacitive reactance is then presented in power-frequency voltage Impedance ratio increases when being struck by lightning Add about 300 times, close to high impedance, is equivalent to open-circuit condition.
If arrester is connect with electroconductive magnetic volume surrounding 3 in actual installation engineering, so that it may effectively utilize ground connection Cable achievees the effect that lightning protection, while it is hanging that electroconductive magnetic volume surrounding 3 can again achieved the purpose that in usually operation.
Vacantly rear another advantage of bring is outer contact: since distance of the three-phase aerial condutor for ground wire is unequal, Some mutual sympathetic difference between them, although the load current on three-phase conducting wire is balance under normal circumstances, on ground Still a longitudinal electromotive force is induced on line, if the mode that ground wire takes each steel tower to be grounded, this electromotive force Electric current will be generated and flow into the earth, result increases the energy loss of route.This additional energy loss is born with same The quadratic sum line length of charged current is proportional, for the power transmission sequence of 220kV, long 200~300km, annual loss electricity Measure about millions of degree.In the world at the beginning of the fifties in last century, energy-efficient project after research ground wire vacantly insulate is begun to.Using After double-layer conductor ground wire of the invention, outer contact is equivalent to a hanging induction ground wire, reduces phase line to the electricity of the earth The energy-saving effect of overhead transmission line may be implemented in capacitance current.

Claims (1)

1. one kind can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver, it is characterised in that: the ground wire is followed successively by from inside to outside leads Electromagnetically internal layer (1), composite insulation layer (2) and electroconductive magnetic volume surrounding (3), in which:
Layer (1) You Duogen zinc-coated wire process forms in the electroconductive magnetic body;
The composite insulation layer (2) is combined by inner insulating layer (2-1), main insulating layer (2-2) and insulating outer layer (2-3), Wherein inner insulating layer (2-1) and insulating outer layer (2-3) are semi-conductive layer;
Electroconductive magnetic volume surrounding (3) the You Duogen zinc-coated wire process forms, and is coated on the outside of insulating outer layer (2-3);
The zinc-coated wire uses soft magnetism wire galvanization;
The main insulating layer (2-2) is prepared with a thickness of 3~25mm, the raw material of main insulating layer by following weight %:
MgZn ferrite powder 20~30
Crosslinked polyethylene surplus;
The semi-conductive layer is prepared with a thickness of 1~3mm, the raw material of semi-conductive layer by following weight %:
Graphite 10~20
Iron powder 5~10
Crosslinked polyethylene surplus;
The conductor cross sectional area of layer (1) and electroconductive magnetic volume surrounding (3) is not less than 50mm in the electroconductive magnetic body2
CN201611032689.1A 2016-11-22 2016-11-22 It is a kind of can ice-melt aerial lightning protection two-conductor Ground wire with insulation ocver Active CN107068285B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1571075A (en) * 2003-07-23 2005-01-26 新疆特变电工股份有限公司 A double winding cable for electromagnetic induction device
CN203225131U (en) * 2013-04-16 2013-10-02 江苏润华电缆股份有限公司 High-voltage-resistant photoelectric mixing tension type flat cable
CN103509229A (en) * 2013-10-12 2014-01-15 绿宝电缆(集团)有限公司 Irradiation crosslinking low-smoke halogen-free flame-retardant polyolefin cable material for photovoltaic cables
CN103730201A (en) * 2014-01-07 2014-04-16 国家电网公司 High-resistance steel core ice melting wire
CN203733539U (en) * 2013-08-16 2014-07-23 深圳市沃尔核材股份有限公司 Fireproof thermal shrinkable casing pipe
CN203930147U (en) * 2014-04-29 2014-11-05 江苏亨通高压电缆有限公司 A kind of submarine optical fiber cable for multiple systems, environment
CN206349177U (en) * 2016-11-22 2017-07-21 张华� It is a kind of can ice-melt built on stilts lightning protection two-conductor Ground wire with insulation ocver

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1571075A (en) * 2003-07-23 2005-01-26 新疆特变电工股份有限公司 A double winding cable for electromagnetic induction device
CN203225131U (en) * 2013-04-16 2013-10-02 江苏润华电缆股份有限公司 High-voltage-resistant photoelectric mixing tension type flat cable
CN203733539U (en) * 2013-08-16 2014-07-23 深圳市沃尔核材股份有限公司 Fireproof thermal shrinkable casing pipe
CN103509229A (en) * 2013-10-12 2014-01-15 绿宝电缆(集团)有限公司 Irradiation crosslinking low-smoke halogen-free flame-retardant polyolefin cable material for photovoltaic cables
CN103730201A (en) * 2014-01-07 2014-04-16 国家电网公司 High-resistance steel core ice melting wire
CN203930147U (en) * 2014-04-29 2014-11-05 江苏亨通高压电缆有限公司 A kind of submarine optical fiber cable for multiple systems, environment
CN206349177U (en) * 2016-11-22 2017-07-21 张华� It is a kind of can ice-melt built on stilts lightning protection two-conductor Ground wire with insulation ocver

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