CN204332400U - Graphite composite overhead ground wire - Google Patents
Graphite composite overhead ground wire Download PDFInfo
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- CN204332400U CN204332400U CN201520067096.3U CN201520067096U CN204332400U CN 204332400 U CN204332400 U CN 204332400U CN 201520067096 U CN201520067096 U CN 201520067096U CN 204332400 U CN204332400 U CN 204332400U
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- overhead ground
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Abstract
The utility model provides a kind of graphite composite overhead ground wire, the outermost layer comprising the inner core be made up of the first composite stone line of ink marker, time skin be made up of longitudinal arrangement outside the second composite graphite wire-wound inner core and obtained around secondary outer braid by metallic fiber, secondary skin wraps up inner core completely, and outermost layer wraps up outermost layer completely; Wherein, the first composite stone line of ink marker is obtained by composite stone ink ribbon twisted, second graphite line is obtained around metallic fiber twisted by composite stone ink ribbon, composite stone ink ribbon comprises two-layer myrmekite layer of ink and is laid in fibrous skeleton, the carbon fiber of two-layer graphite layers, and fibrous skeleton and carbon fiber are coated with adhesive phase.The utility model has lightweight, low resistance, low induction reactance, low kelvin effect advantage, coordinates the lightning protection that can expand overhead ground wire with lightning arrester.
Description
Technical field
The utility model relates to electric power Lightning protection field, particularly relates to a kind of graphite composite overhead ground wire and preparation method thereof.
Background technology
System is the important electric power facility ensureing power equipment safety reliability service, ensure operation power personnel personal safety power ground.Protection overhead transmission line exempts from the device that lightning attacks, and also known as lightning conducter, is called for short ground wire.Transmission line crosses over wide region, is easily struck by lightning and causes power transmission to interrupt at thunderstorm season, becomes in electric power system the one of the main reasons that power outage occurs.Extensively, require that the region of direct striking thunder prevention is large, installing lightning rod can have any problem, and thus sometimes also above wire, sets up overhead ground wire for high pressure and EHV Substation floor space.When there is thundercloud to ground discharge, first lightning passage easily hits overhead ground wire, makes lightning current enter the earth, with the normal power transmission of guardwire.Meanwhile, overhead ground wire also has electromagnetic shielding action, when thundercloud is to ground discharge near circuit, can be reduced in the thunder and lightning induction voltage that wire causes.Overhead ground wire firmly must be connected with tower grounding device, lightning current reliably can be imported the earth, and avoid lightning strike spot current potential raise suddenly and cause counterattack after ensureing to be struck by lightning.Therefore, installing overhead ground wire can reduce lightening hazard, improves the fail safe that circuit runs.Overhead ground wire is also the important component part of high voltage transmission line line structure.
Overhead ground wire is not owing to bearing the function of conveying electric current, so do not require to have the conductance identical with wire and conductor cross-section, the steel strand wire that adopt form more usually.During the normal power transmission of circuit, the electromagnetic induction of three-phase current can be subject in overhead ground wire and occur electric current, thus increase line power loss and affect transmission performance.In addition, because overhead ground wire is generally hung on steel tower highest point, cross section excessive weight increase can bring larger Mechanical loading to steel tower, be used as the aluminum-cladding stranded wire of overhead ground wire or galvanized strand wires cross section so general and compare cable and Yan Geng little, resistance is larger, but which has limited the range of application of conventional steel twisted wire overhead ground wire.
When electric power system generation lightning fault, amplitude of lightning current focuses mostly at 10 ~ 200kA, and according to the lightning current waveform that actual acquisition arrives, most of amplitude of lightning current is all more than 20kA.When electric power system is short-circuited fault, due to current amplitude up to tens kilo-amperes and the duration be generally Microsecond grade.And overhead ground wire mostly is steel strand wire; its resistance, induction reactance are relatively high; high frequency lightning current is difficult to distally propagate at short notice, strongly limit the protection range of steel strand wire overhead ground wire and lightning arrester, causes in Practical Project that a lightning arrester can only available protecting one-level shaft tower.
Utility model content
For existing overhead ground wire Problems existing, the utility model provide a kind of lightweight, resistance is little, induction reactance is little, the graphite composite overhead ground wire of low kelvin effect and preparation method thereof.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of graphite composite overhead ground wire, the outermost layer comprising the inner core be made up of the first composite stone line of ink marker, time skin be made up of longitudinal arrangement outside the second composite graphite wire-wound inner core and obtained around secondary outer braid by metallic fiber, secondary skin wraps up inner core completely, and outermost layer wraps up outermost layer completely; Wherein, the first composite stone line of ink marker is obtained by composite stone ink ribbon twisted, second graphite line is obtained around metallic fiber twisted by composite stone ink ribbon, composite stone ink ribbon comprises two-layer myrmekite layer of ink and is laid in fibrous skeleton, the carbon fiber of two-layer graphite layers, and fibrous skeleton and carbon fiber are coated with adhesive phase; Fibrous skeleton is inorfil, and metallic fiber is copper fiber or aluminum fiber, and the second composite stone line of ink marker is identical with the metallic fiber in outermost layer or not identical.
The fibrous skeleton being positioned at two-layer worm graphite layers mainly plays " skeleton " supporting role, can be glass fibre, boron fibre, kevlar fiber or ceramic fibre, but be not limited thereto.
Copper fiber and aluminum fiber have good conductivity and non-magnetic conductivity, effectively can reduce the induction reactance under the resistance of overhead ground wire and high-frequency current.
As preferably, in the second composite stone line of ink marker, metallic fiber diameter is 0.5mm ~ 0.8mm.
As preferably, in outermost layer, metallic fiber diameter is 0.1mm ~ 1mm.
The preparation method of above-mentioned graphite composite overhead ground wire, comprises step:
Step 1, carries out roll-in to worm graphite and makes worm graphite paper;
Step 2, infiltrates adhesive by fibrous skeleton and carbon fiber surface, and is laid between two-layer worm graphite paper, obtain composite graphite paper, cut composite graphite paper and obtain composite stone ink ribbon through thermosetting, roll-in;
Step 3, carries out twisted to composite graphite band and obtains the first composite stone line of ink marker;
Step 4, obtains the second composite stone line of ink marker by composite stone ink ribbon around the first metallic fiber twisted, and the first metallic fiber is copper fiber or aluminum fiber;
Step 5, with at least one first composite stone line of ink marker for inner core, adopt the second composite stone line of ink marker longitudinally to wrap up inner core and obtain at least one deck second composite stone line of ink marker layer, the second metallic fiber is adopted to obtain at least one deck weaving metallic fibers layer around the second composite stone line of ink marker layer braiding, second metallic fiber is copper fiber or aluminum fiber, identical with the first metallic fiber or not identical.
As preferably, worm graphite paper thickness is 0.1 ~ 1mm.
As preferably, fibrous skeleton and carbon fiber are laid between two-layer worm graphite paper at equal intervals.
As preferably, composite graphite bandwidth is 10 ~ 25mm.
The utility model carries out stranded design to overhead ground wire, and the graphite composite overhead ground wire of design comprises the inner core of the first composite stone line of ink marker formation, time skin that the second composite stone line of ink marker is formed and the outermost layer that metallic fiber is formed; The mechanical property of inner core primary responsibility overhead ground wire, secondary skin mainly takes into account conductivity and the mechanical property of overhead ground wire, the conductivity of outermost layer primary responsibility overhead ground wire.
Copper fiber and aluminum fiber have good conductivity and non-magnetic conductivity, can effectively reduce induction reactance under the resistance of overhead ground wire and high-frequency current; Carbon fiber has good tensile property and has the advantage of lightweight, and graphite has the feature of good conductivity, heat absorptivity and lightweight.Metallic fiber is distributed in time outer and outermost layer of overhead ground wire by the utility model, can reduce high-frequency current to greatest extent by the kelvin effect in situation, effectively make use of the tensile property of copper metal and the good electric conductivity of aluminum metal and carbon fiber.
Compared to the prior art, the utility model tool has the following advantages and beneficial effect:
Existing overhead ground wire is mostly galvanized strand wires or aluminum-cladding stranded wire, needs to limit its size because weight is large, and the restriction of size causes resistance bigger than normal.In addition, the high magnetic permeability of steel cause high frequency lightning current by time there is larger induction reactance and kelvin effect, the serious propagation hindering lightning current, causes the lightning protection of overhead ground wire and lightning arrester limited, and increases the cost of equipment and maintenance.
The utility model provides a kind of graphite composite overhead ground wire of lightweight, low resistance, low induction reactance, low kelvin effect, can solve the problems referred to above that existing overhead ground wire exists, coordinate can expand its lightning protection with lightning arrester; And technique is simple, cost is low, engineer applied Be very effective.
Accompanying drawing explanation
Fig. 1 is the first composite stone line of ink marker schematic cross-section;
Fig. 2 is the second composite stone line of ink marker schematic cross-section;
Fig. 3 is the metallic fibres section schematic diagram of braiding;
Fig. 4 is the utility model overhead ground wire schematic cross-section.
In figure, 1-metallic fiber, the 2-second composite stone line of ink marker, the 3-first composite stone line of ink marker.
Specific embodiment
In concrete enforcement, the main raw materials of the utility model comprise carbon content higher than 85% high-purity worm graphite, metallic fiber, carbon fiber, fibrous skeleton and adhesive, metallic fiber is copper fiber or aluminum fiber, adhesive can be ethyl acrylate water-soluble binder or resinae water-soluble binder, fibrous skeleton is inorfil, can adopt glass fibre etc.
Carry out roll-in to worm graphite and make that smooth surface is smooth, the uniform worm graphite paper of thickness, worm graphite paper thickness is advisable with 0.1 ~ 1mm, and worm graphite paper thickness is excessive, and during twisted, graphite tape easily ruptures.Carbon fiber and fibrous skeleton top layer are infiltrated adhesive, then parallel, be laid between upper and lower two-layer worm graphite paper equally spacedly, adjacent fiber interval 0.5mm ~ 1.2mm, carbon fiber and fibrous skeleton quantity do not do requirement, can adjust according to embody rule environment.60 ~ 100s is kept to carry out thermosetting process in 80 ~ 120 DEG C of temperature; Then, composite graphite paper is obtained through more than twice roll-in.Further, obtain the composite stone ink ribbon of width 10mm ~ 25mm along fiber longitudinally cutting composite graphite paper, gained composite graphite belt surface should be smooth, exposes graphite tape top layer without fiber.
Twisted is carried out to composite graphite band and obtains the first composite stone line of ink marker.Composite stone ink ribbon is obtained the second composite stone line of ink marker around metallic fiber twisted, and the metallic fiber diameter for twisted is 0.5mm ~ 0.8mm.
With the first composite stone line of ink marker for inner core, adopt the second composite graphite wire-wound inner core closely to wrap up inner core and form time skin, adopt metallic fiber to be woven into weaving metallic fibers layer outside secondary skin, the metallic fiber diameter for weaving is 0.1mm ~ 1mm, and the overhead ground wire cross section structure of acquisition is shown in Fig. 4.In inner core, the first composite stone line of ink marker is used for the mechanical characteristic being responsible for overhead ground wire, therefore can need the first composite stone line of ink marker quantity in setting inner core according to the mechanics of Practical Project.
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
See Fig. 4, adopt the graphite wire harness of 91 first composite stone lines of ink marker formations as inner core, the first composite graphite linear diameter is about 2.2mm; Adopt 36 longitudinal close-packed arrays of second composite graphite wire-wound inner core, obtain one deck second composite stone line of ink marker layer, i.e. secondary skin, the second composite graphite linear diameter is about 2.4mm; Copper fiber is adopted to obtain one deck copper fiber braiding layer around secondary outer braid, i.e. outermost layer.The graphite composite overhead ground wire diameter of final acquisition is about 38mm, adopts every meter of resistance of four-electrode method microresistivity survey the present embodiment overhead ground wire, about 0.5 milliohm.
Illustrate this patent described in above-described embodiment; though be described by specific term in literary composition; but the protection range of this patent can not be limited with this; the personage being familiar with this technical field can change it or revise and reach equivalent object after the spirit understanding this patent and principle; and this equivalence is changed and amendment, all should be covered by right and define in category.
Claims (4)
1. a graphite composite overhead ground wire, is characterized in that:
The outermost layer comprising the inner core be made up of the first composite stone line of ink marker, time skin be made up of longitudinal arrangement outside the second composite graphite wire-wound inner core and obtained around secondary outer braid by metallic fiber, secondary skin wraps up inner core completely, and outermost layer wraps up outermost layer completely; Wherein, the first composite stone line of ink marker is obtained by composite stone ink ribbon twisted, second graphite line is obtained around metallic fiber twisted by composite stone ink ribbon, composite stone ink ribbon comprises two-layer myrmekite layer of ink and is laid in fibrous skeleton, the carbon fiber of two-layer graphite layers, and fibrous skeleton and carbon fiber are coated with adhesive phase; Fibrous skeleton is inorfil, and metallic fiber is copper fiber or aluminum fiber, and the second composite stone line of ink marker is identical with the metallic fiber in outermost layer or not identical.
2. graphite composite overhead ground wire as claimed in claim 1, is characterized in that:
Described fibrous skeleton is glass fibre, boron fibre, kevlar fiber or ceramic fibre.
3. graphite composite overhead ground wire as claimed in claim 1, is characterized in that:
In the second described composite stone line of ink marker, metallic fiber diameter is 0.5mm ~ 0.8mm.
4. graphite composite overhead ground wire as claimed in claim 1, is characterized in that:
Metallic fiber diameter in described outermost layer is 0.1mm ~ 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520067096.3U CN204332400U (en) | 2015-01-30 | 2015-01-30 | Graphite composite overhead ground wire |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520067096.3U CN204332400U (en) | 2015-01-30 | 2015-01-30 | Graphite composite overhead ground wire |
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| CN204332400U true CN204332400U (en) | 2015-05-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104599743A (en) * | 2015-01-30 | 2015-05-06 | 武汉大学 | Graphite composited overhead ground wire and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104599743A (en) * | 2015-01-30 | 2015-05-06 | 武汉大学 | Graphite composited overhead ground wire and preparation method thereof |
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