CN204991268U - Middling pressure variable frequency power cable - Google Patents
Middling pressure variable frequency power cable Download PDFInfo
- Publication number
- CN204991268U CN204991268U CN201520817417.7U CN201520817417U CN204991268U CN 204991268 U CN204991268 U CN 204991268U CN 201520817417 U CN201520817417 U CN 201520817417U CN 204991268 U CN204991268 U CN 204991268U
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Abstract
The utility model provides a middling pressure variable frequency power cable, includes the cable core, the outer from interior to exterior of cable core overlaps in proper order and is equipped with inner liner, total shielding layer and low smoke halogen free outer sheath layer, the cable core is formed by three insulation core symmetry strandings, insulation core from interior to exterior comprises conductive layer, conductor shield, crosslinked polyethylene insulating layer, insulation screen and phase separating shielding layer in proper order, and the thickness of crosslinked polyethylene insulating layer is the 5.0 -5.5 millimeter, the phase separating shielding layer is with always the shielding layer is thin around wrapping opposite direction with the copper strips around covering, winding of copper wire and copper strips for the copper wire. The utility model provides a middling pressure variable frequency power cable solves the high -power transportation problem of middling pressure converter. It is not high to solve insulating factor of safety to the cable, the easy problem that is punctured, and insulating properties is good, can deal with the impact of high frequency impulse reflection stack voltage, and anti -interference ability is good, adapts to the multiple environment that lays.
Description
Technical field
The utility model relates to a kind of cable, especially a kind of medium voltage variable frequency power cable for RHVC.
Background technology
In recent years, RHVC relies on its significant advantage that is energy-conservation, laborsaving, that be easy to control automatically, becomes electrically-driven maincenter equipment, impels variable-frequency control technique to be deep into more and more widely in all trades and professions.
Along with the fast development of modern power electronics technology and microelectric technique, high-power RHVC is constantly grown up, and is originally difficult to the high-voltage problem solved always, obtains good solution in recent years by devices in series or units in series.At present, have the low voltage frequency converter manufacturer being not less than 200 at home, its major part is the low voltage product of AC380V, and in middle pressure big-power transducer, at about 30.The power of domestic high voltage AC converter also does larger and larger, and 8000KW has been accomplished in the application of current largest domestic.Domestic generally use 0.6/1kV and following frequency-conversion power cable, because power output is limited, use is restricted.
Frequency due to high order harmonic component is 3 ~ 8 times of first-harmonic, and the impedance accounting rate therefore produced by inductance, electric capacity is much bigger compared with first-harmonic, and this is enough to cause the attention to reactive loss.The frequency-tuning range of variable frequency power supply is wider, no matter frequency height, has the waveform profiles of a basic frequency.It contains many high order harmonic components, and as a kind of row ripple through multiple reflections, amplitude superposition can reach the several times of operating voltage, and cable is longer, and amplitude is higher, if cable insulation coefficient of safety is not high, will puncture.Existing general power cable often punctures situation.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of medium voltage variable frequency power cable, can solve cable insulation coefficient of safety not high, easily breakdown problem, good insulation preformance, the impact of high-frequency impulse reflection superimposed voltage can be tackled, good in anti-interference performance, adapt to multiplely lay environment.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of medium voltage variable frequency power cable, comprises cable core, and cable core is arranged with inner covering, total screen and low smoke and zero halogen external sheath layer outward from the inside to the outside successively;
Cable core is formed by the symmetrical stranding of three insulated wire cores;
Insulated wire cores is made up of conductor layer, conductor shield, crosslinked polyetylene insulated layer, insulation screen and phase-splitting screen from the inside to the outside successively, and the thickness of crosslinked polyetylene insulated layer is 5.0-5.5 millimeter;
Phase-splitting screen and total screen are that copper wire is dredged around adding copper strips lapping layer, and the lapping direction of copper wire and copper strips is contrary.
Insulation screen is peelable release insulation screen, and thickness is 0.64-0.8 millimeter.
In phase-splitting screen and total screen, it is 14 ~ 18 times of brass wire shielding external diameter that copper wire is dredged around pitch, copper wire to dredge around direction be left-hand, be surrounded with copper strips outside copper wire, the lapping direction of copper strips is dextrad.
Conductor shield, crosslinked polyetylene insulated layer and insulation screen adopt three-layer co-extruded mode to be sheathed on outside conductor layer.
The medium voltage variable frequency power cable that the utility model provides, beneficial effect is as follows:
1, utilize the crosslinked polyetylene insulated layer thickeied, make the utility model have excellent insulation property;
2, the mode adopting conductor shield, insulating barrier and insulation screen three-layer co-extruded, interlayer is smooth, homogenizing electric field, improves insulation property, can tackle the impact of high-frequency impulse reflection superimposed voltage.
3, adopt the mode of phase-splitting screen and total screen, achieve the complete closed shield effect of whole cable, make shielding rejection coefficient be less than 0.01.
4, three symmetrical strandings of insulated wire cores, good symmetrical cable structure has better electromagnetic compatibility, can suppress Electromagnetic Interference, improves the anti-thousand immunity energy of cable.
5, phase-splitting screen and total screen are that copper wire is dredged around adding copper strips lapping layer, the lapping direction of copper wire and copper strips is contrary, achieve the complete closed shield effect of whole cable, shielding rejection coefficient is less than 0.01, effectively can suppress high order harmonic component, electromagnetic radiation and conduction, reach the flat Title of symmetry of the every electric parameter of cable, (comprising the various electric parameter such as inductance, electric capacity) containing under high order poised state, transfer impedance is low, high order harmonic component emission measure is little.Cable is in optimum state and plays its insulation level fully, to guarantee that under high-frequency impulse transmitting effect retention is stablized, safe and reliable, and has good combination property, adapts to multiplely lay environment, ensures that cable runs reliably and with long-term.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail:
Fig. 1 is the utility model structural representation.
Embodiment
As shown in Figure 1, a kind of medium voltage variable frequency power cable, comprises cable core, and cable core is arranged with inner covering 6, total screen 7 and low smoke and zero halogen external sheath layer 8 outward from the inside to the outside successively;
Cable core is formed by the symmetrical stranding of three insulated wire cores;
Insulated wire cores is made up of conductor layer 1, conductor shield 2, crosslinked polyetylene insulated layer 3, insulation screen 4 and phase-splitting screen 5 from the inside to the outside successively, and the thickness of crosslinked polyetylene insulated layer 3 is 5.0-5.5 millimeter;
Phase-splitting screen 5 and total screen 7 are dredged around adding copper strips lapping layer for copper wire, and the lapping direction of copper wire and copper strips is contrary.
Insulation screen 4 is peelable release insulation screen, and thickness is 0.64-0.8 millimeter.
In phase-splitting screen 5 and total screen 7, it is 14 ~ 18 times of brass wire shielding external diameter that copper wire is dredged around pitch, copper wire to dredge around direction be left-hand, be surrounded with copper strips outside copper wire, the lapping direction of copper strips is dextrad.
Conductor shield 2, crosslinked polyetylene insulated layer 3 and insulation screen 4 adopt three-layer co-extruded mode to be sheathed on outside conductor layer 1.
Through testing to cable, result shows that cable property indices is excellent, all meets designing requirement, represents cable for specification BPYJVPP2-8.7/10kV3 × 300:
Manufacture process of the present utility model is as follows:
1, conductor layer 1: be made up of (purity >=99.97% of copper) the naked annealed copper wire meeting GB/T3956 regulation.In the manufacturing engineering of cable conductor, first manufacture oxygen-free copper bar by the up-drawing method production line of import, draw single line by the import big drawing machine of continuous annealing.Conductor presses shaping at strand layered processed, ensure that the tight of conductor and Stability Analysis of Structures.Press coefficient and be not less than 0.9, conductive surface bright and clean, that shield without greasy dirt, not damaged and insulate burr, sharp edge, without single line that is protruding or fracture.
2, crosslinking process is extruded
Conductor shield 2, crosslinked polyetylene insulated layer 3 and insulation screen 4 adopt three-layer co-extruded, totally-enclosed chemical crosslinking technique.
3, conductor shield 2
Extrude semi-conductive layer should be coated on equably on conductor layer 1, smooth surface, without obvious twisted wire burr, without wedge angle, particle, burn or abrasive vestige.When peeling off conductor screen, semi-conductive layer should not cause having card to stay phenomenon between conductor strand.
Conductor shield 2 nominal thickness is 0.8 millimeter, and minimum thickness should be not less than 0.64 millimeter.
Conductor shield 2 resistivity is no more than 1000 Europe rice.
4, crosslinked polyetylene insulated layer 3
Insulating barrier 3 adopts cross-linked polyethylene insulating material, and insulation nominal thickness is 5.5 millimeters, and insulation thickness mean value should be not less than nominal value, and the minimum detect thickness of any point should be not less than 5.0 millimeters.
5, insulation screen 4
The crosslinked semi-conductive layer of insulation screen 4 for extruding, semi-conductive layer is coated on insulating surface equably, and surface should be smooth, without wedge angle, particle, to burn or abrasive vestige.
The nominal thickness of insulation screen 4 is 0.8 millimeter, and minimum thickness should be not less than 0.64 millimeter.Insulation screen 4 should be peelable release.
The resistivity of insulation screen 4 is not more than 500 Europe rice.
6, phase-splitting screen 5
Brass wire shielding by dredge around annealed copper wire form, annealed copper wire should meet the regulation of GB/T3953-2009.It is 14 ~ 18 times of brass wire shielding external diameter that copper wire is dredged around pitch, and dredging around direction is left-hand, and the wrapped copper strips of its surface dextrad is tightened, and the mean gap of adjacent copper wire should be not more than 4 millimeters, and any adjacent two interradicular spaces should be not more than 8 millimeters.
Cable copper strip nominal thickness is not less than 0.10 millimeter, and copper strips minimum thickness is not less than 90% of nominal value.
Copper strip shielding is made up of the soft copper band that a ply is wrapped, copper strips is wrapped should be smooth, and the on average rate of putting up between copper strips should be no less than 15% (nominal value), and its minimum rate of putting up should be not less than 5%, without the defect such as crimping, scratch, copper strip joint should be firm, smooth.
6, stranding
Stranding lay ratio controls 25 ~ 30, and cable core should closely and rounding and bending flexibility after stranding to ensure cable.During multicore cable stranding, center and edge all should select PP rope material to fill, and cable core PP tightens, and PP band is overlapping wrapped, and wrapped thickness is 2 millimeters, and Duplication is 10% ~ 30%.After stranding, cable shall be rounded up, without deep-fried twisted dough sticks phenomenon.
8, inner covering 6 is extruded
Its average thickness of inner covering 6 should be not less than nominal value, and the most minimal thickness of any point should be not less than the 85%-0.1 ㎜ of nominal value.Extruding rear outward appearance should smooth, closely knit, rounding.
9, total screen 7
Brass wire shielding by dredge around annealed copper wire form, annealed copper wire should meet the regulation of GB/T3953-2009.It is 14 ~ 18 times of brass wire shielding external diameter that copper wire is dredged around pitch, and dredging around direction is left-hand, and the wrapped copper strips of its surface dextrad is tightened, and the mean gap of adjacent copper wire should be not more than 4 millimeters, and any adjacent two interradicular spaces should be not more than 8 millimeters.
Cable copper strip nominal thickness is not less than 0.10 millimeter, and copper strips minimum thickness is not less than 90% of nominal value.
Copper strip shielding is made up of the soft copper band that a ply is wrapped, copper strips is wrapped should be smooth, and the on average rate of putting up between copper strips should be no less than 15% (nominal value), and its minimum rate of putting up should be not less than 5%, without the defect such as crimping, scratch, copper strip joint should be firm, smooth.
10, external sheath layer 8 is extruded
Adopt the oxygen index of material to be not less than 32 low-smoke halogen-free polyolefin materials, its average thickness should be not less than nominal value, and the most minimal thickness of any point should be not less than the 85%-0.1 ㎜ of nominal value.After sheath extrudes, outward appearance should smooth, closely knit, rounding.
Claims (4)
1. a medium voltage variable frequency power cable, comprises cable core, it is characterized in that: cable core is arranged with inner covering (6), total screen (7) and low smoke and zero halogen external sheath layer (8) outward from the inside to the outside successively;
Cable core is formed by the symmetrical stranding of three insulated wire cores;
Insulated wire cores is made up of conductor layer (1), conductor shield (2), crosslinked polyetylene insulated layer (3), insulation screen (4) and phase-splitting screen (5) from the inside to the outside successively, and the thickness of crosslinked polyetylene insulated layer (3) is 5.0-5.5 millimeter;
Phase-splitting screen (5) and total screen (7) are dredged around adding copper strips lapping layer for copper wire, and the lapping direction of copper wire and copper strips is contrary.
2. medium voltage variable frequency power cable according to claim 1, is characterized in that: insulation screen (4) for peelable release insulation screen, thickness be 0.64-0.8 millimeter.
3. medium voltage variable frequency power cable according to claim 1, it is characterized in that: in phase-splitting screen (5) and total screen (7), it is 14 ~ 18 times of brass wire shielding external diameter that copper wire is dredged around pitch, the thin of copper wire is left-hand around direction, be surrounded with copper strips outside copper wire, the lapping direction of copper strips is dextrad.
4. medium voltage variable frequency power cable according to claim 1, is characterized in that: conductor shield (2), crosslinked polyetylene insulated layer (3) and insulation screen (4) adopt three-layer co-extruded mode to be sheathed on conductor layer (1) outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520817417.7U CN204991268U (en) | 2015-10-21 | 2015-10-21 | Middling pressure variable frequency power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520817417.7U CN204991268U (en) | 2015-10-21 | 2015-10-21 | Middling pressure variable frequency power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204991268U true CN204991268U (en) | 2016-01-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520817417.7U Expired - Fee Related CN204991268U (en) | 2015-10-21 | 2015-10-21 | Middling pressure variable frequency power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204991268U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938738A (en) * | 2016-05-26 | 2016-09-14 | 合肥中海信息科技有限公司 | Variable frequency cable for silver-copper alloy conductor aerospace |
| CN109585071A (en) * | 2018-12-14 | 2019-04-05 | 明达线缆集团有限公司 | A kind of resistance to lightning impulse thunder-lightning cable and preparation method |
-
2015
- 2015-10-21 CN CN201520817417.7U patent/CN204991268U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938738A (en) * | 2016-05-26 | 2016-09-14 | 合肥中海信息科技有限公司 | Variable frequency cable for silver-copper alloy conductor aerospace |
| CN105938738B (en) * | 2016-05-26 | 2017-12-26 | 安徽省巢湖海兴电缆集团有限公司 | A kind of yellow gold conductor Aero-Space frequency-changing cable |
| CN109585071A (en) * | 2018-12-14 | 2019-04-05 | 明达线缆集团有限公司 | A kind of resistance to lightning impulse thunder-lightning cable and preparation method |
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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: 20160120 Termination date: 20191021 |