CN203026242U - Variable frequency cable for frequency converter - Google Patents
Variable frequency cable for frequency converter Download PDFInfo
- Publication number
- CN203026242U CN203026242U CN 201220715407 CN201220715407U CN203026242U CN 203026242 U CN203026242 U CN 203026242U CN 201220715407 CN201220715407 CN 201220715407 CN 201220715407 U CN201220715407 U CN 201220715407U CN 203026242 U CN203026242 U CN 203026242U
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- CN
- China
- Prior art keywords
- cable
- conductor
- frequency
- variable frequency
- frequency converter
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- Expired - Fee Related
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Abstract
The utility model discloses a variable frequency cable for a frequency converter. The variable frequency cable is characterized in that insulated conductors are formed by extruding crosslinked polyethylene insulating layers outside conductors (1), three insulated conductors are stranded to form a main conductor, glass cords (3) are adopted to fill gaps among the insulated conductors, and two layers of non-woven wrapping tapes (4) are wrapped outside each main conductor; and a copper wire open lapping shielding layer (5), a reverse copper tape lapping shielding layer (6) and a flame-retardant polyvinyl chloride jacket (7) are sequentially wrapped outside the non-woven wrapping tapes (4). A conductor 1 of a 3+1 type cable is arranged outside a cable core to form a concentric conductor, and the phases of the three main conductors are sequentially lagged for 120 degrees so as to form a symmetrical balance state, so that current cannot be superimposed, and the damage of upper harmonics to the variable frequency cable is effectively reduced; and by utilizing the cable, the anti-interference performance of a special cable of a variable frequency motor can be improved, and the electromagnetic radiation of a whole system is reduced.
Description
Technical field
The utility model relates to a kind of power cable, and particularly the frequency converter frequency-changing cable, belong to technical field of electric wires and cables.
Background technology
Recent two decades comes frequency control motor that very large development is arranged at home and abroad, and annual growth slightly surpasses 10%, and the DC Transmission annual growth is 3-4%.Variable-frequency motor has advantages of more, and is as few in the equipment investment expense, and simple in structure, volume is little, and cost is low, and is energy-conservation, and speed adjustable range is large, has the characteristic of permanent power, permanent rotating speed, easy to use, and capacity is large etc.Therefore currently use widely in industrial aspect such as metallurgy, mine, railways, widely apply too in household appliance technical field.Owing to generally having adopted frequency control motor in heavy-duty motor, whole generating set can economize on electricity 30% as certain cogeneration power plant.And after the use frequency control, realized the soft start of motor, made machine operation steady, the motor bearings wearing and tearing reduce, and have extended motor useful life and maintenance period.
External environment condition is mainly the impact of the high order harmonic component of frequency converter generation on the impact of frequency-changing cable.For the frequency converter of friendship-straight-friendship type, due to the handoff technique that has adopted switch, what make its output is no longer sinusoidal wave, but can be decomposed into the staircase waveform of sinusoidal fundamental wave and high order harmonic component.Take common 3+1 type power cable as example, complete three-phase power supply system, when three-phase balance, the electric current of its neutral core is zero; When high-order harmonic generation, through the Multi reflection of cable, crest and crest or the superimposed chance of trough and trough to this just can appear, and the longer stacking machine of cable more multilist shows also just more obviously.This large electric capacity of cable itself just has the effect of amplification to high order harmonic component in addition, for 3+1 type cable, without phase difference, so electric current will be superimposed as the several times of former component to the current component of high-order harmonic generation at neutral line in-core, and neutral core will soon be breakdown under high-frequency impulse.
The utility model content
The problem that the utility model exists in order to solve prior art provides a kind of frequency converter frequency-changing cable that improves structure, and electric current can not superposeed, and has effectively reduced the harm of high order harmonic component to frequency-changing cable; And better electromagnetic compatibility is arranged, and can improve the anti-interference of Special cable of frequency-variable electric motor, reduce the electromagnetic radiation in whole system.
The utility model technical solution problem adopts following scheme:
The frequency converter frequency-changing cable, its design feature is, extrudes crosslinked polyetylene insulated layer outward by conductor and consists of insulated wire cores, and three thoroughly do away with the stranded rear formation master core of edge core, space between described insulated wire cores is filled out and is adopted glass cord to fill, wrapped two-layer nonwoven band outside master core; Coated copper wire is thin around screen, reverse copper strips lapped shielding layer and flame-proof polyvinyl chloride sheath successively outward for described nonwoven fabrics band.
The utility model design feature also is:
Described copper wire dredges that adjacent copper wire spacing is not more than 4mm in screen.
Described conductor adopts annealed copper conductor compacting lay configuration.
Advantage of the present utility model is mainly reflected in:
1, the utility model cable is made concentric conductor outside 1 core in the cable of 3+1 type is arranged on into cable core, the phase place of such three master cores lags behind 120 ° successively, formed the state of a symmetrical balance, make electric current can not form stack, effectively reduced the harm of high order harmonic component to frequency-changing cable, better electromagnetic compatibility is arranged, play a role to suppressing electromagnetic interference, and can offset the humorous odd frequency in that of high order, improve the anti-interference of Special cable of frequency-variable electric motor, reduce the electromagnetic radiation in whole system.
2, the utility model cable employing copper wire is thin adds the wrapped two-layer compound shielding of copper strips around shielding, and screen had both played and suppressed the effect that electromagnetic wave is externally launched, and can be used as again the passage and the effect of playing the ground connection core of short circuit current.
3, the utility model adopts copper wire to dredge around shielding, and its surface adopts oppositely wrapped copper strips to tighten, and the adjacent copper wire spacing that copper wire is dredged around screen is not more than 4mm, and what the copper wire spacing equated is distributed in above the cable core circumference.
Description of drawings
Fig. 1 is the utility model construction of cable schematic diagram.
Number in the figure: 1 conductor, 2 crosslinked polyetylene insulated layers, 3 glass cords, 4 nonwoven fabrics bands, 5 copper wires are dredged around screen, 6 copper strips lapped shielding layers, 7 flame-proof polyvinyl chloride sheaths.
Embodiment
As shown in Figure 1, the utility model cable is dredged and is formed around screen 5, copper strips lapped shielding layer 6, flame-proof polyvinyl chloride sheath 7 by conductor 1, crosslinked polyetylene insulated layer 2, glass cord 3, nonwoven fabrics band 4, copper wire.
In concrete enforcement, conductor 1 adopts annealed copper conductor compacting lay configuration, and crosslinked polyetylene insulated layer 2 is extruded in and consists of insulated wire cores on copper conductor, adopts vapor crosslinking; Three thoroughly do away with the edge core twists together, between insulated wire cores, fill and wrapped two-layer nonwoven band 4 with glass cord 3 in the space, set gradually copper wire in the outside of band and dredge around screen 5, the reverse overlapping lapped shielding layer 6 of copper strips, extrude flame-proof polyvinyl chloride sheath 7 at last in shielding; Wherein, copper wire dredges that adjacent copper wire spacing is not more than 4mm in screen.This cable has better electromagnetic compatibility is arranged, and plays a role to suppressing electromagnetic interference, can offset the humorous odd frequency in that of high order, improves the anti-interference of Special cable of frequency-variable electric motor, has reduced the electromagnetic radiation in the whole system.The shielded type cable of this structure can anti-electromagnetic induction, imperfect earth and power line conducted interference, reduces inductance, prevents that induced electromotive force is excessive.Screen had both played and had suppressed the externally effect of emission of electromagnetic wave, can be used as again the passage of short circuit current, can play again the effect of ground connection core.
Claims (3)
1. frequency converter frequency-changing cable, it is characterized in that, consist of insulated wire cores by the outer crosslinked polyetylene insulated layer (2) that extrudes of conductor (1), three thoroughly do away with the stranded rear formation master core of edge core, space between described insulated wire cores adopts glass cord (3) to fill, wrapped two-layer nonwoven band (4) outside master core; The outer coated copper wire successively of described nonwoven fabrics band (4) is dredged around screen (5), reverse copper strips lapped shielding layer (6) and flame-proof polyvinyl chloride sheath (7).
2. frequency converter frequency-changing cable according to claim 1, is characterized in that, described copper wire dredges that adjacent copper wire spacing is not more than 4mm in screen (5).
3. frequency converter frequency-changing cable according to claim 1, is characterized in that, described conductor (1) adopts annealed copper conductor compacting lay configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220715407 CN203026242U (en) | 2012-12-21 | 2012-12-21 | Variable frequency cable for frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220715407 CN203026242U (en) | 2012-12-21 | 2012-12-21 | Variable frequency cable for frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203026242U true CN203026242U (en) | 2013-06-26 |
Family
ID=48650208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220715407 Expired - Fee Related CN203026242U (en) | 2012-12-21 | 2012-12-21 | Variable frequency cable for frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203026242U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104733108A (en) * | 2015-02-26 | 2015-06-24 | 安徽环宇电缆集团有限公司 | Variable frequency cable |
| CN107945934A (en) * | 2017-10-17 | 2018-04-20 | 安徽庆华电缆有限公司 | A kind of thermoplastic elastomer (TPE) insulating sheath flexible cable |
-
2012
- 2012-12-21 CN CN 201220715407 patent/CN203026242U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104733108A (en) * | 2015-02-26 | 2015-06-24 | 安徽环宇电缆集团有限公司 | Variable frequency cable |
| CN107945934A (en) * | 2017-10-17 | 2018-04-20 | 安徽庆华电缆有限公司 | A kind of thermoplastic elastomer (TPE) insulating sheath flexible cable |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130626 Termination date: 20151221 |
|
| EXPY | Termination of patent right or utility model |