CN2805030Y - Concentric conductor type electric power cable - Google Patents

Abstract

The utility model relates to an electric power cable, particularly the electric power cable which has the mutual interference among line cores and the small loss and is characterized in that the three insulated line cores of the cable present the arrangement of the equilateral triangle, and a concentric conductor formed by winding a plurality of copper conductors in the inter-phase, parallel and inclined way is arranged outside the insulated line cores. The summation of the cross section of the concentric conductor is greater than or equal to the cross section of a zero line needed by the cable. Because the three insulated line cores of the cable present the arrangement of the equilateral triangle, the three-phase load line cores of the cable form balanced symmetrical structure. The alternating-current resistance of each core is caused to become equal, and the electromagnetic interference mutually generated by the three-phase load unbalance is reduced. The positive and negative sequence impedance of each line core approaches to zero, and the mutual electromagnetic interference is decreased. Therefore, the interference resisting capability is strong. The concentric conductor has two purposes and can be used as the fourth conductor of the zero line and a cable shield. Because another zero line is not arranged, the copper used quantity is decreased and the cable cost is saved. The electric power cable also causes the outer diameter of the cable to be decreased and the weight of the cable to be reduced.

Description

The concentric conductor power cable

Technical field

Utility model relates to a kind of power cable, phase mutual interference and the little power cable of loss between especially a kind of core.

Background technology

Power cable for some controls require sensitive, the anti-interference occasion of having relatively high expectations to use as the variable-frequency motor power cable, requires to disturb between cable core little.And three-phase four-wire system (3+1 core) service cable that uses at present, because core arrangement architecture imbalance, cause the impedance unbalance between the cable master core, make between the threephase load core that can produce mutual electromagnetic disturbs, to around lay secondary circuit and make it misoperation with the bigger induced current of instrument cable generation.

Chinese patent 01238406.2 discloses a kind of symmetric form concentric conductor power cable, cable adopts three-phase six line structures, the phase line of cable adopts the triangle distributed architecture, three ground wires are distributed in the intersection of per two phase lines, are surrounded by inner covering, concentric conductor layer and outer jacket successively in their outside again.This core is arranged in the balanced, symmetrical structure, greatly reduces the electromagnetic interference that threephase load produces mutually, thereby it is strong to have an antijamming capability, but adopts three ground configurations, has increased the cost and the cable rugosity of cable again.

Summary of the invention

The purpose of utility model is to overcome the deficiency of above-mentioned prior art, provides a kind of cable cost that do not increase, the concentric conductor power cable that antijamming capability is strong

The utility model purpose realizes, the main improvement is that zero line core with cable moves on to outside the cable core, make concentric conductor, and make cross section that concentric conductor forms more than or equal to zero-line section, be equilateral triangle like this between master core and be symmetrically distributed, the positive-negative sequence impedance of each core is zero, thereby has eliminated the uneven electromagnetic interference that produces of impedance, concentric conductor had both been made zero line, again as cable shield.Specifically, utility model concentric conductor power cable, comprise that three thoroughly do away with edge core and outer jacket, it is characterized in that said insulated wire cores is triangular arranged, the outer concentric conductor of being made up of the many alternate crossings arranged side by side of copper conductor of insulated wire cores, said concentric conductor cross section sum is more than or equal to the required zero-line section of cable.

Inhomogeneous for effectively preventing crossing copper wire concentric conductor distribution gap, influence shielding properties, a kind of better is outside the concentric conductor of the alternate crossing arranged side by side of copper conductor, and it is fixing to adopt metal tape or wire to tighten again, and for example copper strips twines, to strengthen shielding properties.

The said concentric conductor of utility model, monofilament cross section are determined, press mutual spacing 4-8mm, and it is long-pending that its gross area sum is equal to or greater than said zero-line section.

The said insulated wire cores of utility model can be the copper core, also can be the aluminium core.

Utility model is owing to the zero line with cable moves to the outer coiled concentric conductor of cable, make three eradication edge cores be triangular arranged, cable threephase load core has formed the balanced, symmetrical structure, make each core AC resistance equality, reduce the uneven electromagnetic interference that produces mutually of threephase load greatly, each core positive-negative sequence impedance all is close to zero, and reduced the mutual electromagnetic interference, thereby antijamming capability is strong; And concentric conductor one line dual-purpose, both can be used as zero line the 4th conductor and used, can make cable shield again, owing to do not establish zero line in addition, reduced copper consumption, saved cable cost, the external diameter of cable is reduced, weight saving.Do not have potential difference between the core, can carry short circuit current during short circuit, can not produce to external world electromagnetic interference, phase-nulling loop impedance and reduce, improved the cable lightning withstand level, improve power supply quality, prolonged the electric radius that send of cable.Utility model can be widely used in skyscraper, missile site and precision electronic device and concentrate place etc. to the anti-interference occasion of having relatively high expectations of cable itself.

Below in conjunction with two embodiments, further specify the utility model structure.

Description of drawings

Fig. 1,2 is a utility model example structure schematic diagram.

Embodiment

Embodiment 1: referring to Fig. 1, the utility model concentric cable, comprise that being three of triangular arranged thoroughly does away with edge core 1, core has inner sheath 2 outward, the outer concentric conductor of forming by the some alternate crossings arranged side by side of copper conductor 3, concentric conductor is outward an oversheath 4, wherein each copper conductor mutual spacing 4-8mm of concentric conductor.

Embodiment 2: referring to Fig. 2, as embodiment 1, concentric conductor has copper strips winding layer 5 outward.

Claims (3)

1, a kind of concentric conductor power cable, comprise that three thoroughly do away with edge core and outer jacket, it is characterized in that said insulated wire cores is triangular arranged, the outer concentric conductor of being made up of the many alternate crossings arranged side by side of copper conductor of insulated wire cores, said concentric conductor cross section sum is more than or equal to the required zero-line section of cable.

2,, it is characterized in that each copper conductor spacing of said concentric conductor is 4-8mm according to the described concentric conductor power cable of claim 1.

3, according to claim 1 or 2 described concentric conductor power cables, it is characterized in that said concentric conductor has the metal winding layer outward.

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