CN202352407U - Power cable special for frequency conversion system - Google Patents
Power cable special for frequency conversion system Download PDFInfo
- Publication number
- CN202352407U CN202352407U CN2011203216349U CN201120321634U CN202352407U CN 202352407 U CN202352407 U CN 202352407U CN 2011203216349 U CN2011203216349 U CN 2011203216349U CN 201120321634 U CN201120321634 U CN 201120321634U CN 202352407 U CN202352407 U CN 202352407U
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- CN
- China
- Prior art keywords
- power cable
- cable
- frequency conversion
- metal conductors
- conversion system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a power cable special for frequency conversion system, which comprises an outer sheath wrapped on the outermost layer of the cable and a plurality of metal conductors, wherein insulation layers wrapped outside the metal conductors enable the metal conductors to be insulate with each other, the plurality of metal conductors are distributed symmetrically, a lining layer is wrapped between the insulation layers and the outer sheath, and a copper wire weaved shielding layer is arranged outside the lining layer. The shielding layer of the power cable has a shielding function and simultaneously can be used as a neutral line or a ground line, so that the power cable can be used in normal places and special places like places which require strong antijamming capability, and can generate higher harmonic due to frequent starting so as to influence other control circuits, and therefore the power cable avoids larger damage to equipment and sensitivity of instruments.
Description
Technical field
The utility model relates to power cable, particularly a kind of frequency conversion system special electric power cable.
Background technology
Converter technique is a technological revolution in dynamo-electric field in recent years; The application of frequency conversion speed-adjusting system is more and more universal; Corresponding; The variable-frequency motor of connection governing system and power cable, the control cable of frequency-variable controller are also had higher requirement, with the higher harmonic current of avoiding generation in service other power supplies, control loop are produced and disturb, or receive the interference of external electromagnetic signal.The structure of the cable that uses mostly at present is 3+1 or 3+3 structure.The plain conductor that comprises mutually insulated, plain conductor are wrapped with an insulating barrier, and wrapped belting layer outside said insulating barrier is provided with inner covering at wrapped belt, and copper wire woven shield, separator, armour, oversheath are set outside inner covering.When this cable uses, generally be fine.But use at special occasions, as the frequency-tuning range that is applied in its variable frequency power supply in the frequency conversion system is than broad, but its waveform is the frequency band profile of a basic frequency, has comprised many high order harmonic components that amplitude is also bigger.This harmonic wave will inevitably feed through to cable, might cause the puncture of cable, and cable length is long more, and high-frequency harmonic voltage is also high more.But, if the cable insulation withstand voltage level is higher, the puncture of cable then can not take place.If the structure of cable adopts common 3+1 core, i.e. three master cores and a zero line, this will make master core unbalanced with interference harmonic voltage that zero line produces, and make the cable can operate as normal, certainly will need the insulation level of increase cable.If symmetrical structure is adopted in the position of master core and zero line; Because lead exchanges effect and symmetrical balance thereof, can adopt general insulation level to get final product so with interference reduction to floor level; So the design of cable should be adopted the pattern of symmetrical structure; And the cable that connects variable-frequency motor and variable frequency power supply is when operation, if generate electromagnetic waves, and then will be to the serious disturbance of neighbouring area means of communication or amplitude modulation recipient generation on every side; Otherwise the external electromagnetic ripple also possibly disturb it.Therefore, should make it not produce or produce less interference signal, to reduce the interference of operational system to external world; Also will improve simultaneously the antijamming capability of cable self, can stop extraneous interference, this is two aspects of problem; All being vital, also is that prior art is needed solution badly.
The utility model content
The utility model provides antijamming capability strong a kind of frequency conversion system special electric power cable.
The utility model solves the problems of the technologies described above through following technical scheme; The utility model proposes a kind of frequency conversion system special electric power cable; Comprise being coated on outermost oversheath of cable and number of metal lead that the insulating barrier that coats said plain conductor makes and keeps insulation, said number of metal lead symmetric arrays between said plain conductor; Wrapped inner covering between said insulating barrier and the said oversheath, said inner covering is provided with the copper wire woven shield outward.
Compared to prior art, the utlity model has following beneficial effect:
Because the utility model adopts 3 core symmetrical structures; Owing to exchange effect and symmetrical balance thereof; Can make the utility model except that can replacing the instructions for use of 3+1 core cable with interference reduction to floor level, also can replace the frequency conversion system special electric power cable of 3+1 and 3+3 structure; Omit the neutral line, reduced the outside diameter of cable, greatly reduced the cable production cost.
Description of drawings
Below in conjunction with accompanying drawing the utility model is done further explanation:
Fig. 1 is the cross section structure sketch map of the embodiment of a kind of frequency conversion system special electric power of the utility model cable proposition.
1, plain conductor; 2, insulating barrier; 3, inner covering; 4, screen; 5, oversheath.
Embodiment
Following embodiment and Fig. 1 of combining is described further the utility model:
Present embodiment provides a kind of frequency conversion system special electric power cable; Comprise and be coated on outermost oversheath 5 of cable and number of metal lead 1; The insulating barrier 2 of clad metal lead 1 makes 1 of plain conductor keep insulation; Wrapped inner covering 3 between insulating barrier 2 and the oversheath 5, number of metal lead 1 symmetric arrays is in oversheath 5 inside.The inner covering 3 outer copper wire woven shields 4 that are provided with.
The utility model is not limited thereto execution mode, and the related realization assembly that is the basis with the utility model thought is all in the protection range of the utility model.
Claims (1)
1. frequency conversion system special electric power cable; Comprise and be coated on outermost oversheath of cable (5) and number of metal lead (1); The insulating barrier (2) that coats said plain conductor (1) makes and keeps insulation between the said plain conductor (1), it is characterized in that said number of metal lead (1) symmetric arrays; Wrapped inner covering (3) between said insulating barrier (2) and the said oversheath (5), the outer copper wire woven shield (4) that is provided with of said inner covering (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203216349U CN202352407U (en) | 2011-08-30 | 2011-08-30 | Power cable special for frequency conversion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203216349U CN202352407U (en) | 2011-08-30 | 2011-08-30 | Power cable special for frequency conversion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202352407U true CN202352407U (en) | 2012-07-25 |
Family
ID=46541392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203216349U Expired - Fee Related CN202352407U (en) | 2011-08-30 | 2011-08-30 | Power cable special for frequency conversion system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202352407U (en) |
-
2011
- 2011-08-30 CN CN2011203216349U patent/CN202352407U/en not_active Expired - Fee Related
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20170830 |