CN208781621U - Weak capacity current type medium-pressure power cable - Google Patents
Weak capacity current type medium-pressure power cable Download PDFInfo
- Publication number
- CN208781621U CN208781621U CN201821805887.1U CN201821805887U CN208781621U CN 208781621 U CN208781621 U CN 208781621U CN 201821805887 U CN201821805887 U CN 201821805887U CN 208781621 U CN208781621 U CN 208781621U
- Authority
- CN
- China
- Prior art keywords
- insulating layer
- layer
- coated
- power supply
- capacity current
- 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.)
- Active
Links
Landscapes
- Organic Insulating Materials (AREA)
Abstract
The utility model discloses a kind of weak capacity current type medium-pressure power cables, are coated with the conducting wire of insulating layer in stranding wrapping layer including being arranged in, the insulation screen between insulating layer and stranding wrapping layer is arranged in, be coated on the oversheath of stranding wrapping layer outer peripheral surface；The insulating layer is made of the first insulating layer and second insulating layer, and first insulating layer is coated on the conducting wire outer peripheral surface, and the second insulating layer is coated on the first insulating layer outer peripheral surface；First insulating layer is crosslinked polyetylene insulated layer, has been uniformly arranged the Vacuum spheres made of cross-linking polyethylene materials in the crosslinked polyetylene insulated layer.The utility model advantage is embodied in the power supply quality for optimizing power supply system, reduce power supply system capacitive reactive power, the inductance current (absorbing capacity current) generated in cable reduces, cable electric energy loss reduces, the policy requirements for meeting national energy-saving consumption reduction, contribute to whole society's energy-saving and environmental protection.
Description
Technical field
The utility model relates to the middle voltage distribution networks long range service cable routes in electric system, more particularly, to weak capacitive
Current mode medium-pressure power cable.
Background technique
China Middle Line Project For Transferring Water From South To North general main canal Tao Cha builds 35kV along canal right bank to Shijiazhuang section overall length about 1100km channel
Route forms private network power supply, forms supply network by 35kV route, center switch station, load point let-down stations.Power supply is quoted from place
13 35kV center switch stations, each center is arranged in 35kV bus in 110~220kV of electric system substation in area altogether
Switchyard draws 1 to 2 time 35kV power supply from the electric system of location, draws 2 times 35kV route difference by center switch station
It is radiated to trunk canal upstream, downstream two sides, 35kV/0.4kV step-down substation is set at the load point of trunk canal and is powered to load point, along canal
13,35kV center switch station of setting altogether, load point step-down substation about 309.By the influence of topography and environmental restrictions, 35kV line
Take overhead transmission line and cable ground burying mixing laying mode in road.
By taking South-to-North Water Diversion Middle Route Project Xu Shui river inverted-siphon center switch station as an example, draws and meet 110kV Tan Shan substation
35kV bus power supply is 2 times, power circuit total length 24.5km, wherein overhead transmission line length 12km, cable run length
12.5km.The river Xu Shui inverted-siphon center switch station 35kV bus outlet 2 is returned, and is powered respectively to trunk canal upstream and downstream side load bus,
Let-down stations are set at each load bus.Total line length 50.7km in the supply district of upstream, wherein overhead transmission line length 37.2km,
Cable run length 13.5km, is dispersed with 16 let-down stations, total line length 41.6km in the supply district of downstream, wherein overhead line
Road length 31.2km, cable run length 10.4km are dispersed with 12 let-down stations；The let-down stations transformer of each load bus always holds
Amount is 4305kVA.Power supply, which puts into operation, will have run nearly 3 year by the end of the end of the year 2017, and electricity consumption data analysis learns that private network supplies
Device for electric load is maximum during electric maximum operational mode is channel maintenance, device for electric during normal water flowing is supplied water
Load capacity is smaller, and the let-down stations power load of each load bus is 700kW or so, and private network power supply system is capacitive power supply system
System, 35kV is for the excessive problem of capacitive current than more prominent, i.e., electric system is needed to the river Xu Shui inverted-siphon center switch station
Capacitive reactive power is provided, power factor is the power tune electricity charge that power consumer is paid to power supply company between 0.2~0.3 in advance
It has been more than that active energy expense used in power consumer (pays the electricity charge of power tune up to hundred according to the regulation of State Grid Corporation of China every year
Ten thousand yuan or more), the end of the year 2017 increased a set of 35kV, 1500kVar reactive power compensator at the river Xu Shui inverted-siphon center switch station
(SVG), the operation of hair capacitive reactive power is addressed problem.The reason of causing problem above to occur, is analyzed as follows:
1, Middle Line Project For Transferring Water From South To North general main canal project inputs initial operating stage, engineering water conservancy project building facility are in serviceable condition, work
Journey maintenance, maintenance workload are small, and maintenance, to maintain equipment power load are small, small to the active power of electric system demand, at this moment
The lagging reactive power (absorbing capacitive) that 35kV cable generates still remains, and causes power supply system power factor low, power supply system
For capacitive systems.
2, the Middle Line Project For Transferring Water From South To North general main canal engineering design period is longer, and the design phase is not considered with economic development in the whole nation
Various regions infrastructure and real estate construction are so swift and violent, and power supply system 35kV route cannot be complete using the scheme of overhead transmission line
It is complete to implement.35kV route and natural river, highway, high-speed railway, local traffic road and bridge, rural area production bridge, city
The infalls such as area's building are both needed to using cable run.Big using cable run quantity, it is long that cable run length accounts for whole route
1/3 or more of degree, the cable of YJV22-26/35-3 × 120 used in power supply line, line capacitance value are the μ f/km of C=0.16,
System voltage is 35kV, is computed, and the lagging reactive power of every kilometer of threephase cable generation is about 65kvar.With system voltage wave
Dynamic, cable is alternate and the lagging reactive power that relatively generates is in 60~70kVar/km, about 10 with length overhead transmission line
Times.
3, the technical performance of medium-pressure power cable is needed with respect to the individual character in special environment condition not yet currently on the market
It asks, the lagging reactive power that 35kV cable run generates is the inherent technology index of normal cable in 60~70kVar/km.Not yet
There is 35kV cable producer to be researched and developed and innovated to the inductive reactive power that cable run generates is reduced, is difficult to choose conjunction on the market
Suitable product can only purchase hair capacitive reactive power equipment (electric reactor compensation device or SVG reactive power compensator) and be mounted on power supply system
System increases equipment investment.
Summary of the invention
The utility model aim is to provide a kind of weak capacity current type medium-pressure power cable.
To achieve the above object, the utility model takes following technical proposals:
Weak capacity current type medium-pressure power cable described in the utility model, including setting are coated in stranding wrapping layer
The insulation screen between insulating layer and stranding wrapping layer is arranged in the conducting wire of insulating layer, is coated on stranding wrapping layer outer peripheral surface
Oversheath；The insulating layer is made of the first insulating layer and second insulating layer, and first insulating layer is coated on the conducting wire
Outer peripheral surface, the second insulating layer are coated on the first insulating layer outer peripheral surface；First insulating layer is crosslinked polyetylene insulated layer, described
The Vacuum spheres made of cross-linking polyethylene materials have been uniformly arranged in crosslinked polyetylene insulated layer.
The ratio between internal diameter r and outer diameter R of the Vacuum spheres are 4:5.
Conductor shield is provided between the conducting wire outer peripheral surface and first insulating layer.
The utility model advantage embodies in the following areas:
1, in capacitive power supply system, such as during the long distance water transfer power supply the private network normally operation of non-turn(a)round, city
During the operation of iron wire road night dip, during the operation of high-speed rail tunnel night dip etc., using the weak capacity current of the utility model
Type medium-pressure power cable can optimize the power supply quality of power supply system, reduce power supply system capacitive reactive power, reduce or exempt
The power tune electricity charge that power consumer is paid to power supply company；It especially applies in long range, the linear power supply system of more load bus
In, the utility model advantage is more prominent；
2, the weak capacity current type medium-pressure power cable of the utility model has dielectric level high compared with common cable
Effect；
3, the inductance current (absorbing capacity current) generated in the weak capacity current type medium-pressure power cable of the utility model
Reduce, cable electric energy loss reduces, and meets the policy requirements of national energy-saving consumption reduction, contributes to whole society's energy-saving and environmental protection.
Detailed description of the invention
Fig. 1 is the section structure diagram of the utility model.
Fig. 2 is Vacuum spheres structural schematic diagram described in the utility model.
Specific embodiment
It elaborates with reference to the accompanying drawing to the embodiment of the present invention, the present embodiment before being with technical solution of the present invention
It puts and is implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to down
State embodiment.
As shown in Figure 1, 2, weak capacity current type medium-pressure power cable described in the utility model, including setting stranding around
It is coated with the conducting wire 2 of insulating layer in covering 1, the insulation screen 3 between insulating layer and stranding wrapping layer 1 is set, is coated on
The oversheath 4 of 1 outer peripheral surface of stranding wrapping layer；Insulating layer is made of the first insulating layer 5 and second insulating layer 6, the first insulating layer 5 packet
2 outer peripheral surface of conducting wire is overlayed on, second insulating layer 6 is coated on 5 outer peripheral surface of the first insulating layer；First insulating layer 5 is that crosslinked polyethylene is exhausted
Edge layer has been uniformly arranged Vacuum spheres 7 made of cross-linking polyethylene materials in crosslinked polyetylene insulated layer, Vacuum spheres 7
The ratio between internal diameter r and outer diameter R are 4:5；To further increase field distribution quality, between 2 outer peripheral surface of conducting wire and the first insulating layer 5
It is provided with conductor shield 8.
The working principle of the utility model is summarized as follows:
1, it in prior art cross-linked polyethylene insulated cable manufacturing process, in cross-linking polyethylene materials, uniformly participates in
The first insulating layer 5 containing Vacuum spheres 7 is made in Vacuum spheres 7 made of cross-linking polyethylene materials.
The relative dielectric constant of cross-linking polyethylene materials is 2.3, disruptive field intensity 35kV/mm；The opposite dielectric of vacuum is normal
Number is 1, disruptive field intensity 130kV/mm.This characteristic of vacuum low-k, high insulation resistance, so that the first insulation
Crosslinked polyethylene volume in layer 5 accounts for the 75% of 5 volume of the first insulating layer, and Vacuum spheres 7 account for the 25% of 5 volume of the first insulating layer,
So that the equivalent relative dielectric constant of the first insulating layer 5 is 1.975.Therefore, piezoelectricity in the weak capacity current type of the utility model
Power cable is compared with existing cross-linked polyethylene insulated cable, and the capacitive coupling electric current of cable reduces 15%, in cable of ignoring
Relatively under the influence of capacitance current, capacity current is reduced by about 19%~20%, greatly reduces electric energy loss.
2, electric field space is formed between conducting wire 2 and the first insulating layer 5 when the utility model is powered, the electricity of the electric field space
Field intensity is distributed by the dielectric constant of insulating materials, i.e., according to Jie of crosslinked polyetylene insulated dielectric constant and vacuum
Electric constant is allocated, and electric field strength is inversely proportional with dielectric constant.The relative dielectric constant 2.3 and the phase of vacuum of crosslinked polyethylene
To dielectric constant 1 compared to differing larger, the cross-linking polyethylene materials field strength distribution that this is allowed in the first insulating layer 5 is extremely uneven
Even, the field strength in Vacuum spheres 7 for causing dielectric constant small is larger, the field strength of the big cross-linking polyethylene materials of dielectric constant compared with
It is small.Further, the larger disruptive field intensity of field strength in the small Vacuum spheres 7 of dielectric constant is also big, the big crosslinked polyethylene of dielectric constant
The field strength of material is smaller, and disruptive field intensity is also smaller, this is exactly the weak capacity current type medium-pressure power cable that the invention is longed for
With the high result of dielectric level.
Claims (3)
1. a kind of weak capacity current type medium-pressure power cable, the conducting wire of insulating layer is coated with including being arranged in stranding wrapping layer,
Insulation screen between insulating layer and stranding wrapping layer is set, the oversheath of stranding wrapping layer outer peripheral surface is coated on；It is special
Sign is: the insulating layer is made of the first insulating layer and second insulating layer, and first insulating layer is coated on outside the conducting wire
Circumferential surface, the second insulating layer are coated on the first insulating layer outer peripheral surface；First insulating layer is crosslinked polyetylene insulated layer, the friendship
The Vacuum spheres made of cross-linking polyethylene materials have been uniformly arranged in connection polyethylene layer.
2. weak capacity current type medium-pressure power cable according to claim 1, it is characterised in that: the Vacuum spheres it is interior
The ratio between diameter r and outer diameter R are 4:5.
3. weak capacity current type medium-pressure power cable according to claim 1 or 2, it is characterised in that: outside the conducting wire
Conductor shield is provided between circumferential surface and first insulating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821805887.1U CN208781621U (en) | 2018-11-05 | 2018-11-05 | Weak capacity current type medium-pressure power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821805887.1U CN208781621U (en) | 2018-11-05 | 2018-11-05 | Weak capacity current type medium-pressure power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208781621U true CN208781621U (en) | 2019-04-23 |
Family
ID=66163676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821805887.1U Active CN208781621U (en) | 2018-11-05 | 2018-11-05 | Weak capacity current type medium-pressure power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208781621U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109243702A (en) * | 2018-11-05 | 2019-01-18 | 河南省水利勘测设计研究有限公司 | Weak capacity current type medium-pressure power cable |
-
2018
- 2018-11-05 CN CN201821805887.1U patent/CN208781621U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109243702A (en) * | 2018-11-05 | 2019-01-18 | 河南省水利勘测设计研究有限公司 | Weak capacity current type medium-pressure power cable |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Liu | Ultra-high voltage AC/DC grids | |
| CN106374463B (en) | A kind of A+ classes power supply area power distribution network powering mode configuration method | |
| Zhao et al. | Technical and economic demands of HVDC submarine cable technology for Global Energy Interconnection | |
| CN105448384B (en) | Power transmission line | |
| CN103839116A (en) | Transformer substation capacity allocation method based on different power supply areas | |
| CN208781621U (en) | Weak capacity current type medium-pressure power cable | |
| CN205230622U (en) | Network system is joined in marriage with compound flexible direct current medium voltage cable of positive negative pole unification optic fibre in city | |
| CN204205591U (en) | A kind of electric automobile can the high reliability DC distribution net of flexible access | |
| Gatta et al. | Steady-state operating conditions of very long EHVAC cable lines: Two case studies | |
| Li | Industrial frequency single-phase AC traction power supply system for urban rail transit and its key technologies | |
| CN108923440A (en) | A kind of negative sequence compensation measure and control device of traction substation group, system and method | |
| CN201430401Y (en) | Position-changing and connection system for tower and ground wires | |
| CN109065338A (en) | A kind of homo-phase traction transformer | |
| CN109215977A (en) | A kind of traction-compensator transformer | |
| Huang et al. | Electrical characteristics of new three-phase traction power supply system for rail transit | |
| Cresta et al. | Prospective installation of EV charging points in a real LV network: Two case studies | |
| CN106026119B (en) | Over long distances, the reactive-load compensation method of more load bus wire electric power systems | |
| CN109243702A (en) | Weak capacity current type medium-pressure power cable | |
| CN113949058A (en) | Energizing method and system suitable for chain circuit in long and narrow area | |
| CN204230893U (en) | A kind of high reliability DC distribution net being applicable to electric automobile and registering one's residence | |
| Liun | Stochastic methodology to estimate costs of HVDC transmission system | |
| Kilter et al. | Modelling of high-speed electrical railway system for transmission network voltage quality analysis: Rail Baltic case study | |
| CN205646836U (en) | Long distance, many load bus threadiness power supply reactive compensation system | |
| Meridji et al. | High-voltage dc conversion: Boosting transmission capacity in the grid | |
| CN208076599U (en) | A kind of power wire broadband carrier communication collector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |