Composite bearing core for external current-conducting strands of overhead high-voltage power transmission line wires and method of its production

FIELD: electric engineering.

SUBSTANCE: composite core is arranged in the form of one or multiple-strand structure, which represents a lengthy rod or twisted lengthy rods of high-strength hear resistant of continuously reinforced composite material. Composite material consists of high-strength reinforcing fiber of one composition with filling extent of 30-85 wt % and thermosetting heat resistant polymer binder with content of 15-70 wt %. Core for protection against damages at the stage of winding of current-conducting layer and under conditions of operation against effect of active factors of environment comprises external metal or heat resistant varnish-cloth shell. In process of core manufacturing, shaping of core profile is carried out by means of cord pulling through heated draw plate or by means of core profile shaping directly in protective external metal shell.

EFFECT: core makes it possible to improve throughput capacity, to provide for minimum sagging of overhead wire of power transmission line and to reduce loads at power transmission line supports.

18 cl, 5 dwg, 2 ex

 

The invention relates to electrical engineering, and in particular to designs supporting cores external conductive wire for transmitting electric energy in the air main high-voltage lines and electric networks.

Characteristic of the world economy steady growth of industrial production and consumption leads to a global problem of electric power industry, as a problem of limited capacity of existing transmission lines (PTL). To increase the capacity of power transmission lines (PTL) and increase transmitted through the power grid companies carry out technical modifications of existing networks:

- by constructing parallel lines;

- by transferring more load on the wires of larger diameter;

- through the development of new advanced materials wires and cores of the lines.

The construction of parallel lines requires significant capital investment, time, and permits the installation of new lines.

Transfer of additional load on the wire gauge is not always possible, because the currently used wire transmission lines larger cross-section are of such weight that the old poles are often not RASSC the Tana, which ultimately leads to the necessity of installing new transmission towers. Organization of construction of new footings turns serious problems in densely populated areas, areas of private land, national parks, nature reserves and other areas closed for construction.

Practice leading electricity companies shows that a promising direction in solving capacity transmission lines (PTL) is the development of new structural materials for cables and cores power lines capable of long-term operated at temperatures of 150-250°C, because the increase in the number of transmitted electricity while saving space live Posiva in wires high voltage power lines is inevitably linked with additional ohmic losses and, accordingly, with the heating wire under operating conditions. Currently used in high-voltage transmission lines stale-aluminum wire the speakers have a long-term service 90°C. these wires are designed so that under operating conditions the mechanical load is distributed between current-carrying aluminum polivom and steel bearing core. At a temperature of 100-110°C current-carrying Powel wire AC start the AET to otjihase, loses strength and the wire breaks or the value of its slack is becoming more acceptable values defined by the regulations for the safe operation of high voltage lines.

When choosing wire for renovation of existing lines or construction of new power lines network companies seek to increase the capacity of transmission lines, to reduce the load on the bearing, to reduce wind load. At least two of the above symptoms wire is considered to be promising for use.

The applicant, in accordance with the substance of patented technical solutions, analyzed the characteristics and parameters are known and used at present, domestic and foreign construction materials cores for overhead transmission lines. The analysis showed the following.

Famous traditional domestic materials for the manufacture of cores.

For example, the well-known design stranded wire, containing made of copper wire Central core, the coils of the inner and outer powwow ("bare Wires for overhead transmission lines" GOST 839-80). Such designs wires have a high electrical conductivity, working for many years, their long-term operation in an open atmosphere possible bliod the OC relatively low rate of corrosion from exposure to the environment. The disadvantages of such constructions wires is their high cost and relatively low mechanical strength, which resulted in the change in ambient temperature cause large fluctuations in shafts of SAG of conductors.

A known design of stranded wires, all polivy and a Central core which is made of galvanized steel wires (GOST 3062-80 and GOST 3063-80). These wires have high mechanical strength, but lower electrical conductivity, corrosion, despite the fact that they are made of galvanized wires. In operation it is necessary to additionally cover anti-corrosion grease.

Known wire transmission line (patent RF №2063080, NV 5/08). The wire consists of a steel core and several powwow of aluminum wires of different diameters. The core is made of nitrogen-containing non-magnetic austenitic steel with low magnetic permeability and high strength. The wire has a low resistance and high mechanical strength.

Known wire for overhead transmission lines (patent RF №2179348, NV 5/08). Core and Powel made of steel wire with at least one protective layer of Nickel and/or chromium and/or copper. Version of " the wire is the wire, which consists of the orbits of the outer Posiva made of copper wire, the Central core and inner powwow, made of steel wire with a protective layer of zinc. The coils of the outer powwow performed with at least one protective layer of Nickel and/or chromium.

Study of the technical and operational characteristics of these materials allows us to state that the traditional domestic market of construction materials core high-voltage power lines are not significantly increase bandwidth and transmitted power transmission line, which is relevant technical problem at the present time.

One of the most promising ways of increasing the capacity of transmission lines using stale-aluminum wires, in which the conductors are made of high-temperature aluminum-zirconium alloy that retains its mechanical properties at a temperature of 180-240°C, and the bearing core is a special steel wire is coated on the surface of various protective coatings to provide corrosion resistance of the core at the operating conditions.

Known wire type GTACSR (news electrical engineering 5 (35), 2005), in which aluminum conductors of aluminum-zirconium alloy inner layer, near Ichigo to the core, have a trapezoidal cross-section. The internal layer is made in such a way that between it and the steel core has a gap filled with lubricant, resistant to temperature. This design provides slip aluminum layers relative to the steel core, which GTACSR wire can be pulled, only fixing a steel core and eliminating the mechanical tension of the aluminum layer. This solution guarantees a small (determined only by the linear expansion coefficient of steel) elongation (sagging) of the wire due to temperature increase. Accordingly GTACSR wires increase the transmitted power. On the other hand, these constructs special procedure is required wire tension, more complex compared to a normal tension stale-aluminum wires. The main difference between technology installation GTACSR and conventional wires is mounting clamps. In the case of the use GTACSR wire aluminum layers must be Raspletina for attaching wires to the anchor supports. After mounting and tensioning the wire left for 24 hours for alignment (slide) conductive layers relative to the tense of the steel core, then the wire is tightened.

Maximum operating temperature GTACSR wires 150°C. At this temperature, the transmitted power can the t to be increased in 2 times.

For wire type ZTACIR (news electrical engineering 5(35), 2005) with power core from staticimage alloy INVAR allowable temperature reaches 210°C and the transmitted torque is 2.5-3 times higher than in the lines with the usual stale-aluminum wires with the same design supports (the height of the suspension point). However, the cost of the wires type ZTACIR today at 5 times the cost of conventional wire, a GTACSR wire is more expensive than conventional wire 2.5 times.

Similar designs have wire type T ACSR, GAP, ACSS, TAI (news electrical engineering 5 (47), 2007). These wires provide increased bandwidth transmission lines. However, a lot of weight and cost make the prospects of their practical application unattractive.

Also known wire with a composite core for transmission lines (PCT application WO No. 2005/040017, VN; the applicant is an American company Composite Technology Corp.'s (CTC)that is closest to the technical nature of the patented invention and selected as a prototype.

Aluminum conductor composite core (Aluminum Conductor Composite Core (ACCC) cable from the Composite Technology Corp.(CTC) has a supporting core, which represents an epoxy matrix reinforced with carbon and glass fibers. During the process of pultrusion continuous unidirectional carbon fiber forms a solid core is ylindrical form, while the layer of fibers of E-glass is the same orientation fits around the outer casing. Carbon and glass fiber impregnated with a high temperature epoxy resin.

A layer of fiberglass serves two purposes: first, it separates the carbon from the conductive aluminum current-carrying Posiva to prevent contact corrosion; second, it "balances" more fragile carbon fiber and improves the flexibility of the core. Light conductive cable ACCC from Composite Technology Sagrader received ultronia solid structural core of the epoxy matrix reinforced with carbon and glass fibers coated with a conductive annealed aluminum wire. To obtain a solid core in the form of a rod wet bundle of fibers is carried out through the steel die plate and utverjdayut at 260°C. Protective outer coating is applied and cured on the production line. Rod cut to customer length. The cores have diameters from 12.7 mm to 69.85 mm, which gives a current density of 300 a to 3500 And on line. In the wiring system ACCC can continuously operate at 180°C and can withstand intermittent surges of up to 200°C With only 10%SAG on the extent of sagging wire with a steel core.

Significant disadvantages of the composite core and how it is manufactured, described in PCT application WO No. 2005/040017 are:

- complex, multi-layered design of the core, representing a single lengthy rod, consisting of cross section of the internal high modulus layer, reinforced with fibers having a modulus of elasticity of 100-300 GPA and a tensile strength at break of 2.5-7 HPa (in the patent described and recommended carbon fiber), external low-modulus layer reinforced with fibers having a modulus of elasticity of 40-100 GPA and a tensile strength at break of 1.2-2 HPa (in the patent described and recommended glass fiber) and an outer polymeric protective coating. The content of reinforcing fibers in the core of the company CTC is not less than 50 wt.%. A negative consequence of core construction company CTC is that the core can be manufactured in the form of a solid rod of relatively large minimum diameter, unable to curl, which determines the loss of flexibility as the core and wires in General, the decrease in resistance of the core to the alternating loads during operation, the necessity of using large coils of non-standard diameters at the stages of manufacturing and transportation. Use in the core of two different fibers having different coefficients of thermal expansion, causes the appearance in the core is ri temperatures of 180-200°C optional internal thermal stresses, negatively affecting the efficiency of the core and wires in General. In addition, when attaching wires on poles you want to use non-standard fittings, not available to the General consumer;

- technological complexity of production of the core, due to the need by passing through the die plate to simultaneously produce all the layers of the core of two dissimilar fibers having different physical and mechanical characteristics. Moreover, low-modulus fibers have high uniformity distributed in the outer layer of the core. The disadvantage of this method, in addition to requiring the use of expensive technological equipment, the limited capacity of 18 m/min, is the presence of a high probability of partial or complete absence of low-modulus glass fibers on individual sections of the outer layer of the core. On such sites under operating conditions may develop contact corrosion with the participation of current-carrying aluminum Posiva and carbon fiber core, resulting in premature destruction of the entire wire.

The present invention solves the problem:

- development of high-strength, flexible and able to curl core for aerial wires of high-voltage transmission lines,

- increase throughput, is Eisenia slack wires of high-voltage transmission lines, reduce the load on the electric poles;

- ensure reliable operation wires of high-voltage transmission lines at temperatures of 150-300°C.;

- simplify the method of manufacturing a core and improve manufacturability of its manufacture for wire transmission lines.

The solution of a technical problem is achieved as follows.

Composite bearing core to the external current-carrying wire overhead high-voltage transmission lines, such as those described in PCT application WO No. 2005/040017, patentable according to the invention the core is made in the form of single or multi-strand designs, representing a long rod or twisted long rods of high strength heat resistant continuous reinforced composite material having a tensile strength at break of not less than 1 GPA.

The invention provides that the core consists of high-strength reinforcing fibers of the same composition with a degree of filling of 30-85 wt.% and heat resistant thermosetting polymeric binder content of 15-30 wt.%.

According to the invention the core to protect it from damage at the stage of winding current-carrying Posiva and conditions from exposure to active environmental factors contains the outer metal or heat resistant to lakhadanova the shell.

The invention provides for the use of different variants of the reinforcing fibers. As a reinforcing fibre use: glass fibers having a tensile strength of 2-5 GPA and a modulus of elasticity of 40-100 GPA; carbon, aramid, polyimide, ceramic, glass, basalt, boron fibers having a tensile strength at 2-8 GPA and a modulus of elasticity of 50-600 HPa.

According to patent the invention the binder is a modified epoxy resin with a glass transition temperature of 150-300°C. Provided that the binder is made on the basis of crasneanscki, polyimide, polyester, epoxy, phenol-formaldehyde resins and dihydrophosphate binder having a long-term operation up to 300°C.

According to the present invention developed a high-tech method of manufacturing a composite rotor core for an external current-carrying wire overhead high-voltage transmission lines. In the newly developed method provides that for forming lived core use of high-strength reinforcing fiber of the same composition. The degree of filling heat-resistant polymer matrix, the reinforcing fiber is 30-85 wt.%, while the content of thermosetting heat-resistant polymer binder - 15-70 wt.%.

For the formation of composite core is the quality of the reinforcing glass fibers are used, carbon, aramid, polyimide, ceramic, basalt, boron fibers, and for the formation of the polymeric matrix core as a thermosetting binder use epoxy composition with a glass transition temperature of 150-300°C or thermosetting binder based on crasneanscki, polyimide, polyester, epoxy, phenol-formaldehyde resins and dihydrophosphate binder having a long-term operation up to 300°C.

The invention provides for the possibility of two options for applying the outer protective coating of the core. The outer protective lacademie coating of the core is produced by spiral winding ribbon of glass or other heat resistant fabric pre-impregnated with heat-resistant polymer composition having long-term operation up to 300°C. the formation of the metal outer protective coating of the core is carried out by placing the bundle of reinforcing fibers impregnated with thermosetting heat-resistant binder, aluminum tape, which roll together with impregnated fiber into the cylinder in a forming device.

Summary of the invention shows that the basis of patentable inventions (modifications of the composition of the core and method of its manufacture) is a complex new the x and original technical solutions, which causes the following technical result:

- added ability to manufacture core wires for high voltage transmission lines, which combines high mechanical strength, flexibility and the possibility of twisting;

- achieved an increase in operating temperature wire transmission line. Wires of high-voltage transmission lines from patentable bearing composite core and current-carrying wires, aluminum wires capable of long-term operated at a temperature of 150-300°C;

- provides a significant increase in the throughput of high-voltage transmission lines. The use of patent-pending core wires operated at temperatures of 150-300°C, allows to increase the capacity of high-voltage transmission lines 2-5 times;

the invention allows for the minimum slack of the aerial wire transmission line and reduce the load on the electric poles, to increase the turnaround time period.

The technical result of patentable inventions is that for the manufacture of composite core is implemented in a simpler and less labor-intensive production technology that can improve the efficiency of the process.

The invention is illustrated lower the following description of patentable options designed composition of the core, method of manufacture and graphics that represent:

figure 1 - patented solid core in the outer leacockanimal sheath and the wire on its basis;

figure 2 - multi-core in the outer leacockanimal sheath and the wire on its basis;

figure 3 - multi-core in the outer metal shell;

figure 4. - scheme for single conductor core;

5 is a scheme for single conductor core in a metal shell.

Patented composite bearing core to the external current-carrying wire overhead high-voltage transmission lines designed for continuous operation at temperatures of 150-300°C. you can also use patent-pending weight-bearing composite core wires of high-voltage transmission lines at temperatures up to 90°C instead of steel carrier cores stale-aluminum speaker wires.

Depending on the final modification of the core may be made in the form of solid (1) or stranded (figure 2, 3) designs and have outer lamtkupvufu 2 or metal 6 protective shell.

Wire-based single core contains (1) a single core 1, the outer protective lamtkupvufu shell 2, the current-carrying Powel 3.

Wire-based multi-core contains (2) many of the wire core 4, outer lamtkupvufu shell 2 and the current-carrying Powel 3.

The essential advantage of the patented core is the possibility of multiple realization through the use of different source components to form a composite material. However, the degree of filling of the reinforcing fiber in the composite core is 30-85 wt.%, while the content of the heat resistant binder is 15-70 wt.%.

For the production of patented rotor core use the following types of reinforcing fibres:

- high modulus glass fibers having a tensile strength of 2-5 GPA and a modulus of elasticity of 40-100 GPA. The degree of filling of reinforcing glass fibers is 60-85 wt.%;

carbon aramid, polyimide, ceramic, glass, basalt, boron fibers having a tensile strength of 2.8 GPA and a modulus of elasticity of 50-600 HPa.

According patentable invention binder represents:

- heat resistant epoxy composition with a glass transition temperature up to 300°C;

- binder based crasneanscki, polyimide, epoxy, polyester, phenol-formaldehyde resins and dihydrophosphate with long-term operation up to 300°C.

The diameter of long rods for the manufacture of stranded composite core pillar is t from 0.5 to 6 mm, while the diameter of the elongated rod for the manufacture of single-conductor composite core is from 2 to 20 mm.

As already noted, a significant advantage of the present invention is the ability of different final modifications to the design of the core, method of its production, as well as the possibility of their use for industrial production of patentable core of a wide range of polymeric materials and components.

The choice of end-constructive version of the core is determined by the specific manufacturer based on the availability of raw materials (for example, a manufacturer associated with the production of a particular fiber or binder and has accordingly it a substantial discount), the presence of production facilities (for example, the manufacturer has set pultrusion), production program, marketing research. The choice of the optimal composition of the core and the final contents of the components, the choice of modifying core construction and method of its production is, ultimately, based on the technical and operational requirements.

Bearing core high-voltage wire must have high physical and mechanical properties, heat resistance and long life.

Mechanical properties of the core member is raised by the properties of the reinforcing fibers. So:

- glass fiber - durable, low-modulus, heat-resistant, cheap, satisfactory fragile clips that are resistant to alternating loads;

carbon fiber is a strong, high modulus, heat-resistant, expensive, fragile;

- aramid fiber is a high strength, srednemotornoy, partially resistant, malapropos, very expensive.

Manufacturer of cables for high-voltage transmission lines has a wide choice of potential brands reinforcing fiber that allows you to choose the best design, technology and production strategy.

The applicant considers it necessary to clarify the significance of patentable ratio of reinforcing fibers and a binder.

It is known that the lower the composite core of reinforcing fibers, the less its strength properties. It is established that at 30 wt.% the content of the reinforcing fibers are the strongest known fibers such as aramid fibers "Rusar", provide the core strength at 1 HPa, which allows the use of such cores produced in the wires. The minimum allowable strength properties of the core define the lower limit of the content of the reinforcing fibers is 30 wt.% (rest binding).

The heat resistance of the core is determined by the properties of the binder. So,

Epoque is ednie binders are characterized by high adhesion, strength, high shrinkage, reduced resistance, average price,

- polyester resins are characterized by average values for all indicators, low heat;

kremniiorganicheskie binder characterized by low adhesion and durability, low shrinkage, high temperature resistance and chemical resistance, high price.

The applicant States that when the binder content is less than 15 wt.%. may be compromised the integrity of the core (not achieved impregnation of all fibers). These technological aspects limit the maximum content of the reinforcing fibers at the level of 85 wt.%, (rest binding).

Thus, patentable invention valid range of the content of the reinforcing fibers are set at the level of 30-85 wt.%, and connecting at the level of 15-70 wt.%.

It should be noted that professionals working in the field of development of composite materials that have the appropriate knowledge about the presence of diverse polymeric and composite materials for ultimate realization of all variants of patentable composition of the core, in addition to those polymeric materials that are listed as possible implementations.

Specific technical implementation and identification of all possible initial components and a binder for the production of patentowego the composite core is not difficult for experts as follows from the prior art on the basis of practical data and includes well-known standard binders and components that are found in various scientific and technical journals and books (see, for example, "Encyclopedia of polymers" vol. 1, 2, 3), on the basis of which can be obtained the desired binder, whereby a more detailed disclosure of these initial components and the binder is impractical.

Manufacturer of patented core exercise by pultrusion or method of molding core in a protective outer metal shell.

Method pultrusion.

Glass, carbon, or any other reinforcing fiber 7 (figure 4) delivered with special coils in a dry condition and comes in the tub 8 impregnation with a heat resistant polymer binder, where wetted polyester, epoxy or other heat-resistant composition, the excess binder is removed by passing the beam moistened fibers through the calibration hole (not shown in figure 4), after which the dipped beam fiber passes through the zone 9 preliminary Galatasaray binder and extending through the die plate 10 to the specified profile, heated to a temperature of 80-300°C.

In filiere 10 is formed profile and curing of the core. If necessary, the final curing of the core is carried out in thermop the Chi. At the die exit 10 get ready material, having a cross-section defined by Villeroy, and stable properties both along the length and across the section.

On the formed core (solid or stranded) apply the outer protective shell. The application of the outer protective sheath carry out the method of the spiral winding of the ribbon of glass or other heat resistant fabric pre-impregnated with heat-resistant polymer composition having long-term operation up to 300°C. In a variant stranded core construction conductors of core twist on the torsion machines and then winding machines is wound on the twisted core lamtkupvufu membrane impregnated with heat-resistant polymer composition. In the manufacture of the core in the form of a multi-strand twisted lived use the standard torsion machine with twist and coiling machines for applying the outer protective leacockanimal tape (figure 4 and 5 not shown). When the twisted multi-core use the standard schema type 1+6 i.e. around the Central veins on the torsion machines rolled six lived. In multi-core there is always a Central vein and curled around her wrists. Central vein stranded core 5 shown in figure 2, 3.

The prepared core material is wound on the take-up cat is the Cabinet 11.

Patented production technology developed composite core helps to ensure the performance of the manufacturing core of 20-30 m/min, which exceeds the corresponding performance of manufacturing a core for the prototype method.

Method of molding core in a protective outer casing

The applicant has developed a radically new and efficient technology of molding core in a protective outer metal shell.

A significant advantage of the developed method of molding the core in a protective sheath is its high productivity and the ability of the outer protective metal sheath, which is part of the core, to pass electrical current, which further increases the capacity of the core.

Forming core in a protective outer metal shell is as follows. Glass, carbon, or any other reinforcing fiber 7 (5) leaves the coils in the dry state and is supplied into the tub 8 impregnation, where wetted polyester, epoxy or other heat-resistant resin, the excess binder is removed by passing the beam moistened fibers through the calibration hole (figure 5 are not shown), after which the beam moistened fibers placed on yeosulsa aluminum tape 12, usually made of the same material as the conductive wire Posiva. In a forming device 13 carry out the folding of the tape together with impregnated fiber into the cylinder. Curing the binder in the formed core exercise as a result of its continuous passage through the zone of thermal heating 14. The finished core is wound on the take-up spool 11. If necessary, the final curing of the core is carried out in heat treatment furnaces (figure 5 are not shown).

The outer protective metal shell protects the core from damage during manufacture and Posiva wire and conditions from thermo - and photo-oxidative degradation.

The resulting seam aluminum shell if necessary, weld laser or resistance welding before winding on the take-up spool 11.

To increase the adhesion of the aluminum tape previously subjected to chemical or electrochemical machining and dressing.

EXAMPLE 1.

Preparation of the binder is carried out by mixing the resin of SEDM-6 (OST 6-05-5125-82) 55 wt.%, which is a product of the modification epoxygenase resin Organoelement the oligomer with etilendiamin anhydride (IEA - 610) 45 wt.%. Mixing of the epoxy composition is carried out in dissolver for 10 minutes.

Glass is e high modulus fiber FMP 7 (5) (roving (300 Tex) JSC "GRP"), having a tensile strength of 3.5 GPA in micro-plastic and elastic modulus of 70 GPA, wound with coils at a speed of 5 m/min and passed through a bath of 8 heated to 40°C finish epoxy composition. Moistened with a binder fiber impose on the moving aluminum strip 12, after which they pass through a forming device 13 in the form of a snail, heated to 130°C. where aluminum tape roll together with impregnated fiber into the cylinder and get the core in the form of a rod with a diameter of 2 mm, the Finished core is heat treated in a heating zone 14. Final curing of the core is in heat treatment furnaces (figure 5 are not shown). The content of reinforcing fibers in the finished core 80% (wt.), epoxy binder 20% (wt.).

The resulting core has the following characteristics: tensile strength of 1.92 GPA, a density of 1.7 g/cm3the coefficient of thermal expansion of 0.8·10-61/deg, temperature limit long-term operation 180°C, the possible short-term heating up to 200°C.

EXAMPLE 2.

Getting weight-bearing composite core as in example 1. As reinforcing fibers used aramid fiber "Rusar" (thread (600 Tex) LLC Thermotex)having a tensile strength in micro-plastic 6,5 GPA and the elastic modulus of 130 GPA. The content of reinforcing fibers in the finished core 70 wt.%, epoxy SV is based on 30 wt.%.

The resulting core has the following characteristics: a tensile strength of 2.8 GPA, a density of 1.2 g/cm3the coefficient of thermal expansion - 1.5·10-61/deg, temperature limit long-term operation 180°C, the possible short-term heating up to 200°C.

Steel cores are used at present in the wires of the AC high-voltage transmission lines have the following characteristics: tensile strength of 1.35 GPA, a density of 7.8 g/cm3the coefficient of thermal expansion of 11.2·10-61/deg, temperature limit long-term operation 90°C.

Comparison of physico-mechanical characteristics of the cores described in examples 1, 2, with steel core wire AC suggests that the patented composite cores are 1.5-2 times stronger, 4,5-6,5 easier, have a 7.5-14 times smaller than the coefficient of thermal expansion. The use of patented cores in wires high voltage power lines will significantly increase resistance to ice and wind loads, to reduce the load on the electric poles in ensuring 3-10% of SAG compared with steel cores. In addition, the operation of the wire with the patented core described in examples 1, 2, in high-voltage transmission lines at a temperature of 180°C will increase their capacity by 3 times.

Tested prototype patented core and patent-pending method of manufacturing confirmed high performance composite bearing reinforced core, as well as high efficiency and manufacturability of the process of its manufacture. Testing showed that the developed composite core in its technical-economic parameters and operational capabilities significantly superior to products of similar purpose, which ensures its effective use in stranded wires for transmitting electric energy in the air main high-voltage power lines.

1. Composite bearing core to the external current-carrying wire overhead high-voltage transmission lines, wherein the core has a single - core or multicore design, is a long rod or twisted long rods of high strength heat resistant continuous reinforced composite material having a tensile strength at break of not less than 1 GPA, consisting of high-strength reinforcing fibers of the same composition with a degree of filling of 30-85 wt.% and heat resistant thermosetting polymeric binder content of 15-70 wt.%.

2. The core according to claim 1, characterized in that series is echnic to protect it from damage at the stage of winding current-carrying Posiva and conditions from exposure to active environmental factors contains the outer metal or heat-resistant lamtkupvufu shell.

3. The core according to claim 1, characterized in that the reinforcing fibers used are glass fibers having a tensile strength of 2-5 GPA and a modulus of elasticity of 40-100 GPA.

4. The core according to claim 1, characterized in that the reinforcing fibers are carbon aramid, polyimide, ceramic, glass, basalt, boron fibers having a tensile strength at 2-8 GPA and a modulus of elasticity of 50-600 HPa.

5. The core according to claim 1, characterized in that the binder is an epoxy composition with a glass transition temperature of 150-300°C.

6. The core according to claim 1, characterized in that the binder is made on the basis of crasneanscki, polyimide, polyester, epoxy, phenol-formaldehyde resins and dihydrophosphate binder having a long-term operation up to 300°C.

7. The core according to claim 1, characterized in that the diameter of the long rods for the manufacture of stranded composite core comprises from 0.5 to 6 mm

8. The core according to claim 1, characterized in that the diameter of the elongated rod for the manufacture of single-conductor composite core is from 2 to 20 mm.

9. The core according to claim 1, characterized in that each lived core has a protective metal sheath thickness from 0.1 to 0.3 mm, usually made of the same material as the conductive wire stand the VA.

10. A method of manufacturing a composite rotor core for an external current-carrying wire overhead high-voltage power lines, comprising winding a continuous reinforcing fibers, coils, impregnation obtained harness heat resistant polymer binder, wring out the excess binder, pre-Galatasaray binder, molding the core in the form of a long rod, causing the outer protective shell and the winding core on the take-up spool, characterized in that for the formation of one or several cores core use of high-strength reinforcing fiber of the same composition, the degree of filling heat-resistant polymer matrix, the reinforcing fiber is 30-85 wt.%, while the content of thermosetting heat-resistant polymer binder 15-70 wt.%, when forming core in the form of a long rod is carried out by pulling the harness through a heated die plate, after which the core cause the outer protective lamtkupvufu shell or by molding the core directly in a protective outer metal shell, which is placed tow of reinforcing fibers impregnated with thermosetting heat-resistant binder, on a moving aluminum tape, which roll together with impregnated fiber in the Qili the others in a forming device.

11. The method according to claim 10, characterized in that for forming a composite core as reinforcing fibers are used, respectively, of glass, carbon, aramid, polyimide, ceramic, basalt, boron fibers.

12. The method according to claim 10, characterized in that for forming the polymer matrix of the core is used as a thermosetting binder, respectively epoxy composition with a glass transition temperature of 150-300°C, or thermosetting binder based on crasneanscki, polyimide, epoxy, polyester, phenol-formaldehyde resins and dihydrophosphate binder having a long-term operation up to 300°C.

13. The method according to claim 10, characterized in that the outer protective lacademie coating of the core is produced by spiral winding ribbon of glass or other heat resistant fabric pre-impregnated with heat-resistant polymer composition having long-term operation up to 300°C.

14. The method according to claim 10, characterized in that the core multi-strand designs are a result of twisting single molded lived on the torsion machines, then on the received multi-core spiral winding is wound ribbon of glass or other heat resistant fabric pre-impregnated teplostroy the ow of the polymer composition, having long-term operation up to 300°C.

15. The method according to claim 10, characterized in that the formation of the outer metallic protective coating of the core is carried out by placing the bundle of reinforcing fibers impregnated with thermosetting heat-resistant binder, the subsequent removal of excess binder and its preliminary Galatasaray, on a moving aluminum tape, usually made of the same material as the conductive wire povia, aluminum tape roll together with impregnated fiber into the cylinder in a forming device, utverjdayut binder in the formed in the form of a long rod core during its continuous passage through the heating zone and is wound on the take-up spool.

16. The method according to item 15, wherein forming the seam of the outer protective coating in the form of an aluminum shell weld laser or resistance welding before winding on the take-up spool.

17. The method according to item 15, wherein the full curing of thermosetting binders if necessary to complete after winding core on the take-up spool in the furnaces.

18. The method according to item 15, wherein the core multi-strand designs are a result of twisting single molded lived with outer protective metal shell for kroutil who's machines.



 

Same patents:

FIELD: electric engineering.

SUBSTANCE: invention relates to electric engineering. The overhead ground wire cable consists of central steel wire (1) having D1 diametre. The first layer in the cable consists of seven wires (2) having D2 diametre, while the second layer is composed of interchanging seven steel wires (3) of D3 diametre and seven steel wires (4) of D4 diametre. The third layer of fourteen steel wires (5) of D5 diametre is implemented so that the first, second and third layers have similar lays in one direction and linear contact with the first, second and third layers. The diametres ratio is as follows D1 : D2 : D3 : D4 : D5 = (1.81-1.9):(1.3-1.36):(1.3-1.36):1:(1.6-1.67). The external surfaces of the third layer wires are laid with a gap sized as 3-5% from nominal wire diametre. They are plastically deformed, and contact surface area between the third layer wires is increased as well as the contact surface between the first and second layer wires. Generally, the overhead ground wire cable is tightened.

EFFECT: increased stability of overhead ground wire cable to lightning, vibration impacts and to short circuit impacts and etc.

1 dwg

FIELD: railway transport; conductors for choke , choke-to-choke, track, track-to-track jumpers and electric-traction connectors of rail circuits in electrified railways using direct- and alternating-current traction.

SUBSTANCE: proposed steel-core copper wires whose electric conductivity amounts to 50-60% of that of copper wires of same sectional area are twisted to form stranded conductor incorporating definite number of wires; stranded conductor is subjected to flexible plastic bend at least in two relatively perpendicular planes through at least size of conductor diameter and to heat treatment by way of annealing in acid-free atmosphere at temperature of 720-820 °C for 4-6 h followed by cooling down to 180-200 °C in same atmosphere, and final cooling in the open. Stranded conductor is twisted in at least four lays applied sequentially in alternating directions of lays , pitch ratio of external lays being 1.3 to 1.5 fold lower than that of internal ones, Stranded-conductor jumpers and connectors are flexible and reliably function under cyclic bend and twist conditions at heavy load currents of DC and AC traction circuits.

EFFECT: enhanced reliability and service life of jumpers and connectors made of proposed conductors.

2 cl, 3 dwg, 1 tbl

FIELD: uninsulated (bare) wires and current-conducting bodies consisting of several wires twisted in the form of a rope.

SUBSTANCE: bimetallic wire forming the conductor is replaced by a bimetallic structure of wire. The wire consists of seven copper and twelve steel conductors, the first and the six subsequent conductors are copper ones, the rest twelve conductors are steel ones, the copper conductors have a lay of a strand within 100 to 150 mm, and the rest conductor - 150 to 200 mm, the steel conductor may have a zinc-coated surface.

EFFECT: enhanced service life of wire and reduced cost of wire.

2 cl, 1 dwg

The invention relates to electrical engineering and railway transport

The invention relates to electrical engineering, namely, to designs of stranded conductors for overhead lines used for transmission of electric energy in the air networks and lines electrified transport as cable pin pendants

The invention relates to electrical engineering, and in particular to structures of bare stranded conductors for overhead lines used for transmission of electric energy in the air networks and lines electrified transport as a reinforcing feeding and suction lines

The invention relates to the electric power industry, namely air lines electroparadise

The invention relates to power engineering and can be used on air lines

FIELD: electricity.

SUBSTANCE: in the known method including cable wires ends fixing to receiving device, their subsequent drawing with concurrent wires twisting around core, the new consists in cable wires ends fixing to receiving device using terminal in which wires are pressed together with cable core, and wires twisting around core is executed by disk rotation at angular velocity that is found from empiric formula. To implement declared method for twisting wires of water-cooled cable device is offered which in contrast to known device for manufacturing additionally contains table and press for squeezing cable terminals. It is reasonable to insert short tubes in peripheral holes of disks. Suggested device allows to fabricate cables of definite length with embedding wires into terminals, at that effective wire twisting is performed taking in consideration various cable psrsmeters. Tubes installed in disks prevent wire damage during drawing.

EFFECT: widening of technical facilities arsenal, method and device for manufacturing cables of definite length with regard to required parameters and quality improvement.

3 cl, 2 dwg, 1 tbl

FIELD: electrical engineering including cable engineering; midget control cables for wire communication lines of small-size missiles and their manufacturing process.

SUBSTANCE: proposed midget control cable has two electrically insulated enameled copper conductors (current-carrying conductors), one strengthening complex thread of cross securing lea winding of three polyamide threads forming thread assembly, as well as seven strengthening complex threads placed on top of cross securing winding in parallel with copper conductors, and secondary securing winding of one complex strengthening thread; thread assembly is impregnated with water-repelling liquid. Proposed method for manufacturing midget control cable includes manufacture of thread assembly followed by finishing midget control cable for which purpose seven strengthening complex threads are arranged in parallel with thread assembly whereupon finished midget control wire is wound on take-in reel.

EFFECT: improved electrical and mechanical characteristics, ability of using cable immersed in water including sea water.

2 cl, 2 dwg

FIELD: electrical engineering including cable engineering; midget control cables for wire communication lines of small-size missiles and their manufacturing process.

SUBSTANCE: proposed midget control cable has two electrically insulated enameled copper conductors (current-carrying conductors), one strengthening complex thread of cross lea securing winding of three polyamide threads forming thread assembly, as well as four strengthening complex threads placed on top of cross securing winding in parallel with copper conductors, two-layer lea winding of two polyamide threads wound in opposite directions, and one complex thread. Proposed method for manufacturing midget control cable includes manufacture of thread assembly followed by finishing midget control cable for which purpose four strengthening complex threads are arranged in parallel with thread assembly and two-layer winding is placed overall.

EFFECT: improved electrical and mechanical characteristics, ability of using cable immersed in water including sea water.

2 cl, 3 dwg

FIELD: cable or rope manufacturing industry, possible use for producing flexible current-conductive wires of ropes.

SUBSTANCE: proposed method for laying multi-wire current-conductive wire is performed in accordance to system m x (n x d), where m -number of strands in lay of cable or rope; n - number of wires in each strand; d - diameter of elementary wire. For realization of aforementioned laying system in m giving devices of spinning machines of hoop or cigar type coils are mounted with clusters of n wires on each coil, while output of wire from giving devices to frames or rotor of machines is performed in direction, opposite to movement of cable template. Cluster with n wires during movement from giving coil onto rotating frame is laid with step h=v/w, where v - linear speed of pulling device, m/min, w - turns of frame, 1/min. during displacement from the frame into caliber, strand is also laid for step h in the same direction. Therefore, at output direction of lay is produced which matches direction of lay of strand and step of lay of wires in strand is averagely twice less than step of lay of strands in the lay.

EFFECT: possible laying of multi-wire cable products, providing for simultaneous laying of strands and laying of cable or rope using said strands.

5 cl

Electric cable // 2256969

FIELD: electrical engineering; electric cables for signaling, control, and data transfer and processing systems.

SUBSTANCE: cable has at least one pair of insulated and stranded current-carrying conductors and cable sheath. Insulating material is either halogen-containing polymer (polyvinyl chloride), or halogen-free polyolefin base material (polyethylene), or its copolymer. Insulation thickness is chosen from equation strand pitch is found from equation h = 25(2Δ + d), where d is conductor diameter; εr is relative dielectric constant of insulating material. With diameter of cable current-carrying conductors being enlarged, capacitance of cable pair was reduced (other characteristics being retained at desired level.

EFFECT: enhanced capacitance of working load on cable pair.

1 cl, 4 dwg, 1 tbl

The invention relates to a device for the manufacture of twisted wires of two or more nutrient wires

The invention relates to the cable industry and can be used mainly for reverse splicing power cables with solid conductors

The invention relates to the field of electrical engineering and relates to the execution device for SZ-stranding conductive lived pie

The invention relates to the field of hardware industry and can be used in the production of steel cords and multi-layered rope and cables

Electric cable // 2256969

FIELD: electrical engineering; electric cables for signaling, control, and data transfer and processing systems.

SUBSTANCE: cable has at least one pair of insulated and stranded current-carrying conductors and cable sheath. Insulating material is either halogen-containing polymer (polyvinyl chloride), or halogen-free polyolefin base material (polyethylene), or its copolymer. Insulation thickness is chosen from equation strand pitch is found from equation h = 25(2Δ + d), where d is conductor diameter; εr is relative dielectric constant of insulating material. With diameter of cable current-carrying conductors being enlarged, capacitance of cable pair was reduced (other characteristics being retained at desired level.

EFFECT: enhanced capacitance of working load on cable pair.

1 cl, 4 dwg, 1 tbl

FIELD: cable or rope manufacturing industry, possible use for producing flexible current-conductive wires of ropes.

SUBSTANCE: proposed method for laying multi-wire current-conductive wire is performed in accordance to system m x (n x d), where m -number of strands in lay of cable or rope; n - number of wires in each strand; d - diameter of elementary wire. For realization of aforementioned laying system in m giving devices of spinning machines of hoop or cigar type coils are mounted with clusters of n wires on each coil, while output of wire from giving devices to frames or rotor of machines is performed in direction, opposite to movement of cable template. Cluster with n wires during movement from giving coil onto rotating frame is laid with step h=v/w, where v - linear speed of pulling device, m/min, w - turns of frame, 1/min. during displacement from the frame into caliber, strand is also laid for step h in the same direction. Therefore, at output direction of lay is produced which matches direction of lay of strand and step of lay of wires in strand is averagely twice less than step of lay of strands in the lay.

EFFECT: possible laying of multi-wire cable products, providing for simultaneous laying of strands and laying of cable or rope using said strands.

5 cl

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