CN2593327Y

CN2593327Y - Conductive wire core and cable for winding made thereof

Info

Publication number: CN2593327Y
Application number: CN 03226752
Authority: CN
Inventors: 刘军; 杜新梅; 刘坚栋
Original assignee: TEBIAN ELECTROTECHNICAL CO Ltd XINJIANG
Current assignee: Tebian Electric Apparatus Stock Co Ltd
Priority date: 2003-01-13
Filing date: 2003-01-13
Publication date: 2003-12-17
Anticipated expiration: 2013-01-13

Abstract

The utility model relates to a conductive wire core and a cable for windings made thereof. The conductive wire core with a special structure is made of copper foils, and conventional multi-core twisted conductors are replaced. The conducing wire core can be divided into a plurality of layers and at least comprises a core conductor, an insulating winding enveloping layer and a copper foil conductor layer. The cable for windings made of the conducting wire core at least comprises the conducting wire core, an inner semiconductive layer, an insulating layer and an outer semiconductive layer. The outermost layer of the conducting wire core must be a conductor layer, the inner semiconductive layer contacts a metal conductor electrically and reliably, and the potential of the inner semiconductive layer and the potential of the metal conductor are identical. The cable is exclusively used for manufacturing the windings of the electric apparatuses such as the transformer, the reactor, the motor, etc. The conducting wire core which is exclusively used for the windings and the cable which is made of the conducting wire core have the characteristics that the fabrication is convenient, the fabricating process is simple, the eddy current loss of the conductors in the strong magnetic field circumstance is reduced, the bending radius is large, the conductors are compact, etc.

Description

A kind of conductor wire core reaches the winding cable by its manufacturing

Technical field:

The utility model relates to a kind of conductor wire core and by the winding cable of its manufacturing, the conductor wire core of this special construction is to replace the multicore stranded conductor of routine to make by Copper Foil.This kind cable is exclusively used in the winding of electric equipments such as making transformer, reactor, motor.

Of the present utility modelly be exclusively used in the conductor wire core of winding and cable that this conductor is made has easily manufactured, characteristics such as technology is simple, loss is little, bending radius is big, conductor compactness.

Background technology:

For the power transformer of routine, generally adopt the square-section lead, the shape of this lead makes non-uniform electric, and is more concentrated in its edges and corners field intensity, easily has electric hidden danger.Simultaneously in order to make the eddy current loss in the winding reduce to minimum, must adopt the mode of transposition along the lead of winding short transverse, so that magnetic field that lead is received is even, therefore this transformer device structure will be tending towards complexity.In addition, also need take measures to improve Electric Field Distribution and prevent partial discharge, simultaneously, further eliminate of the influence of the control electric field of conventional electric power transformer, one of problem of the key when also being design grounded parts at winding overhang.

Conventional cable conductor adopts that multi-core conductor is stranded to form more, its conductor is processed into filament with prefabricated copper bar through the copper big drawing machine earlier because need, then through stranded technology, install layer insulation again additional, according to sectional area require again through stranded, install technology such as insulation additional and be made into the conductor wire core that replaces by strand and multi-core conductor and layer insulation, outer semiconducting layer and insulating barrier constitute the cable winding cable in squeezing into then.This cable can to coiling work bring certain difficulty because of bending radius because be stranded vertical long lead during the coiling winding.Simultaneously, the conductor structure of normal cable must improve compact degree through drawing-die, and technology such as stranded is also complicated.

Summary of the invention:

Technical problem to be solved in the utility model is at weak point of the prior art, provides a kind of conductor wire core and by the winding cable of its manufacturing.Thisly be exclusively used in the conductor wire core of winding and cable that this conductor is made has easily manufactured, characteristics such as technology is simple, loss is little, bending radius is big, compact conformation.

The technical scheme that solution the utility model technical problem is adopted is this conductor wire core, can be divided into several layers, comprise an axle center conductor at least, insulation lapping layer, Copper Foil conductor layer, the axle center conductor is by the wrapped covering of insulation lapping layer, and the Copper Foil conductor layer is wrapped again outside the insulation lapping layer.By the winding cable of this conductor wire core manufacturing, comprise the conductor wire core as conductor, interior semi-conductive layer, insulating barrier, outer semiconducting layer.The outermost layer of conductor wire core must be a conductor layer, and semi-conductive layer and metal tape reliably electrically contacted around conductor in this made, and had same potential.

With the cylinder mode that this cable winding of the utility model forms, its electric field can be confined to winding inside fully, and is therefore all different with traditional dry-type transformer and oil-filled transformer, do not need to control the electric field of end winding region.There is not the little fillet that rectangular conductor had in the conventional transformer winding in the cable conductor of circular winding, and the maximum allowable field intensity of conductor is being limited at the roundlet angle of this rectangular conductor.For traditional power transformer, promptly to consider the electrical design of electromagnetism and the feasibility of structural design, consider the effect of electromagnetic field, temperature and mechanical force again to transformer, also to consider influencing each other between these effects simultaneously.So general more complicated of the electrical design of conventional electric power transformer and structural design.Outer semiconducting layer of the present utility model is when causing zero or quite during electronegative potential, electric field will be confined to the inside of cable fully by reliable connection, this just provides a kind of brand-new electrical design and construction design method for transformer manufacturing firm.The utility model makes electric field be confined to the inside of cable fully, this makes between the winding and winding waits over the ground and can handle respectively, only need consider during design how to guarantee that fully cooling off required space gets final product, this makes winding that the utility model constitutes than the winding construction of conventional electric power equipment, easy and simple to handle many, has overcome the restriction of Electric Field Distribution aspect in the present traditional power transformer design.

The utility model adopts layered structure, and the insulating tape lapping layer is set between the Copper Foil lapping layer, and this structure can greatly reduce conductor and be in the eddy current loss that produces under the strong magnetic field circumstance, plays extraordinary energy-saving effect.Wrapped structure can also increase bending radius, the activity coefficient of cable simultaneously, has made things convenient for coiling work.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a cross section structure schematic diagram of the present utility model

Among the figure: the 1-conductor wire core; 1a-axle center conductor; The 1b-lapping layer that insulate; 1c-Copper Foil lapping layer; Semi-conductive layer in the 2-; The 3-insulating barrier; The 4-outer semiconducting layer.

Embodiment:

Conductor wire core of the present utility model can be divided into several layers, requires to increase the wrapped number of times that replaces of Copper Foil conductor layer (1c) and insulation lapping layer (1b) according to the cross section, thereby reaches the purpose that increases sectional area.According to the requirement of conductor wire core nominal cross, Copper Foil conductor layer (1c) alternately forms sandwich construction with insulation lapping layer (1b).The primary structure of cable is followed successively by as shown in Figure 1 from inside to outside: as the conductor wire core (1) of conductor, interior semi-conductive layer (2), insulating barrier (3), outer semiconducting layer (4).In order better to solve the winding heat dissipation problem, the axle center conductor in the conductor wire core (1) can be made hollow type, wherein can lead to refrigerating gas or cooling liquid, make it reach better cooling effect by circulation.

Conductor wire core of the present utility model (1) comprises an axle center conductor (1a) at least, axle center conductor (1a) is by the wrapped covering of insulation lapping layer (1b), Copper Foil lapping layer (1c) is outside this insulation lapping layer (1b), can be according to the requirement of nominal cross, Copper Foil lapping layer (1c) alternately constitutes cable conduction core (1) with insulation lapping layer (1b).This conductor outermost layer must be Copper Foil (1c), and this makes interior semi-conductive layer (2) and metal tape reliably electrically contact around conductor (1), has same potential.And must be attached to enough low current potential or zero potential by outer semiconducting layer (4).

The utility model is had similar thermal coefficient of expansion, and can push formation with its interior semi-conductive layer (2) of cable, insulating barrier (3), each layer of outer semiconducting layer (4) by the winding of conductor wire core (1) manufacturing.By the winding cable of conductor wire core manufacturing, the resistance coefficient of interior semi-conductive layer (2), outer semiconducting layer (4), it is worth 10 ^-6Ω cm～10 ⁵In the Ω cm scope, be preferably in 10 ^-3Ω cm～10 ³Ω cm, the best is 1 Ω cm～500 Ω cm.Semi-conductive layer (2), outer semiconducting layer (4), resistance is at 50 μ Ω～50M Ω.The insulating material of the solid insulator system in interior semi-conductive layer (2), insulating barrier (3), the outer semiconducting layer (4) is the thermoplastic of LDPE (low density polyethylene (LDPE)), HDPE (high density polyethylene (HDPE)), PP (polypropylene), PB (polybutene), PMP (polymethylpentene), XLPE (crosslinked polyethylene), EPR (ethylene-propylene rubber) family macromolecule material or silicone rubber kinds.The cross-section of cable amasss at 2～3000mm ²In the scope, the outside diameter of cable is between 20～250mm.Cable outer semiconducting layer (4) need be attached to enough low current potential or zero potential.

Can select different production line (Li Ta or stretched wire) with the increase of different electric pressures, cross-sectional area of conductor.The insulating layer material that extrudes can be the thermoplastic of following material: LDPE (low density polyethylene (LDPE)), HDPE (high density polyethylene (HDPE)), PP (polypropylene), PB (polybutene), PMP (polymethylpentene), XLPE (crosslinked polyethylene), EPR (ethylene-propylene rubber) or silicone rubber kinds.

Claims

1, a kind of conductor wire core can be divided into several layers, it is characterized in that comprising at least an axle center conductor (1a), insulation lapping layer (1b), Copper Foil conductor layer (1c).

2, conductor wire core according to claim 1 is characterized in that the requirement according to the conductor wire core nominal cross, and Copper Foil conductor layer (1c) alternately forms sandwich construction with insulation lapping layer (1b).

3, conductor wire core according to claim 1 is characterized in that axle center conductor (1a) can be made into hollow type, and wherein logical refrigerating gas or cooling liquid make it reach better cooling effect by circulation.

4, a kind of winding cable by claim 1 or 2 or 3 described conductor wire core manufacturings, the outermost layer that it is characterized in that the conductor wire core (1) as conductor must be Copper Foil conductor layer (1c), this makes interior semi-conductive layer (2) and metal tape reliably electrically contact around conductor, has same potential.

5, the winding cable by the conductor wire core manufacturing according to claim 4 is characterized in that interior semi-conductive layer (2), insulating barrier (3), each layer of outer semiconducting layer (4) have similar thermal coefficient of expansion, and can push formation.

6, the winding cable by the conductor wire core manufacturing according to claim 5 is characterized in that the resistance coefficient of interior semi-conductive layer (2), outer semiconducting layer (4), and it is worth 10 ^-6In Ω cm～100k Ω cm scope, be preferably in 10 ^-3Ω cm～10 ³Ω cm, the best is 1 Ω cm～500 Ω cm.

7, the winding cable by the conductor wire core manufacturing according to claim 5, the resistance that it is characterized in that interior semi-conductive layer (2), outer semiconducting layer (4) is 50 μ Ω～50M Ω.

8,, it is characterized in that the insulating material of the solid insulator system in interior semi-conductive layer (2), insulating barrier (3), the outer semiconducting layer (4) is the thermoplastic of LDPE (low density polyethylene (LDPE)), HDPE (high density polyethylene (HDPE)), PP (polypropylene), PB (polybutene), PMP (polymethylpentene), XLPE (crosslinked polyethylene), EPR (ethylene-propylene rubber) family macromolecule material or silicone rubber kinds according to claim 4 or 5 or 6 or 7 described winding cables by the conductor wire core manufacturing.

9, according to claim 4 or 5 or 6 or 7 described winding cables, it is characterized in that the cross-section of cable amasss at 2～3000mm by the conductor wire core manufacturing ²In the scope, the outside diameter of cable is between 20～250mm.

10, according to claim 4 or 5 or 6 or 7 described winding cables, it is characterized in that outer semiconducting layer (4) is connected to enough low current potential or zero potential by the conductor wire core manufacturing.