CN203689973U - High-resistance steel core ice-melting lead - Google Patents
High-resistance steel core ice-melting lead Download PDFInfo
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- CN203689973U CN203689973U CN201420008841.2U CN201420008841U CN203689973U CN 203689973 U CN203689973 U CN 203689973U CN 201420008841 U CN201420008841 U CN 201420008841U CN 203689973 U CN203689973 U CN 203689973U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 47
- 239000010959 steel Substances 0.000 title claims abstract description 47
- 238000002844 melting Methods 0.000 title abstract description 18
- 239000004020 conductor Substances 0.000 claims description 24
- 230000004888 barrier function Effects 0.000 claims description 12
- 230000008018 melting Effects 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 230000011218 segmentation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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Abstract
A high-resistance steel core ice-melting lead relates to a lead, for solving the problems that when conventional ice-melting leads are used for melting ice, the turning-off of power is needed, the required ice melting power capacity is large, the leads are only applicable to full length lead heating and incapable of segment selection, the energy consumption is high, and the impact on a power grid is great. The high-resistance steel core ice-melting lead comprises split bare lead wires, an insulating layer, high-resistance split steel stranded core lines, and a section switch. The specification cross section of the high-resistance split steel stranded core lines is selected according to national standards. The high-resistance split steel stranded core lines are stranded sequentially from the inside to the outside in a layered manner, and are located in the inner side of the insulating layer. The split bare lead wires are stranded sequentially from the inside to the outside in a layered manner in the outer side of the insulating layer. The section switch is connected in series among the split bare lead wires. The section switch is a switch or disconnector of a 0.5-35 KV voltage grade. The high-resistance steel core ice-melting lead is used for electric power overhead lines.
Description
Technical field
The utility model relates to a kind of wire, is specifically related to high value steel core ice-melt wire.
Background technology
Power overhead network wire icing problem is accompanied by power supply network development always and expands, and has become worldwide problem.Be subject to greenhouse effect to affect extreme climate in recent years multiple, electric power transmission line icing problem happens suddenly day by day, the method that people prevent and treat line ice coating at continuous research and probe always.The de-icing method having adopted both at home and abroad at present has short circuit ice-melting method, adjusts load ice-melting method and 10KV capacitance compensation ice-melting method etc.Because being subject to electric network composition, main transformer capacity, ice-melt limiting voltage practical application successful case little, the ice-melt of 10KV capacitance compensation can not meet the demands at the above overlength circuit of 220KV, and short circuit ice-melting method effect is relatively good but install expensive, technical sophistication in 220KV and the universal difficulty of following power grid application.When these de-icing method ice-melts, circuit all needs to have a power failure, and required ice-melt power supply capacity is large, and short circuit ice-melt two phase conductor ice-melts need power supply capacity at 300,000 KW～600,000 KW, are equivalent to a medium-sized capacity of a power station.General minor scale power net does not all have such ability, and the feature of line ice coating is not all icing of all fronts mostly, just at special weather section icing, and above-mentioned de-icing method can only be applied to wire-heated completely, the ability that does not have segmentation to select, consumes the energy and greatly electrical network is impacted large.
Also immature by " automatic defrosting aerial condutor does not have a power failure " current technology of ice-melt, his problem reduces while being ice-melt behind wire current-carrying cross section, conductor overheating amount still can not meet the requirement of the transmission line electric current de-icing technology standard that State Grid Corporation of China issues for 2012, for example national grid regulation LGJ-300 wire is in the time that temperature is 5 meter per second for-5 DEG C, wind speed, maximum ice melting current and minimum ice melting current are respectively 1486.87A and 660.4A, and every km wire power consumption is that P is:
P＝I
2*r?W/km
Every meter of DC resistance r of LGJ-300 wire is:
r＝0.0935Ω/km，
Calculating and obtaining unit wire maximum power dissipation is 206W/m, and minimum power consumption is 40.7W/m.
Taking LGJ-300 wire as example, getting its economic current density is 0.8, and ampacity is 300 × 0.8=240A.When ice-melt, wire current-carrying cross section reduces 3/4, and being equivalent to every km D.C. resistance increases by 4 times, and every km DC resistance is:
0.0935Ω×4＝0.374Ω/km，
Every meter of wire ice-melt power output is:
240
2×0.375÷1000＝21.5w/m，
This value is less than the LGJ-300 wire minimum power 40.7w/m that State Grid Corporation of China requires, and can not meet the requirement of line ice-melting power demand.
In January, 2008, the freezing disaster of south China seven provinces caused electric grid large area to fall bar, disconnection portion region-by-region electrical network in collapse and state of paralysis.These above-mentioned ice-melt measures are owing to existing these problems not bring into play due effect.The direct economic loss that this freezing disaster causes is up to more than one hundred billion, brings great impact to people's production, life, and indirectly economic loss and social influence cannot be estimated for they.
Utility model content
The utility model all needs when solving existing ice-melt wire ice-melt to have a power failure, required ice-melt power supply capacity is large, and can only be applied to wire-heated completely, the ability that does not have segmentation to select, exist and consume the energy greatly and electrical network is impacted to large problem, thereby proposed high value steel core ice-melt wire.
High value steel core ice-melt wire comprises share split plain conductor, insulating barrier, high value share split steel strand heart yearn and block switch,
From inside to outside layering strand system successively of high value share split steel strand heart yearn, described high value share split steel strand heart yearn is positioned at insulating barrier inner side,
Share split plain conductor from inside to outside successively layering strand built in insulating barrier outside,
Block switch is connected in the middle of share split plain conductor.
Described block switch is 0.5～35KV electric pressure switch or disconnecting link.
The bright beneficial effect of this law is: its sectional is arranged on the transmission line in icing location and replaces former wire, coordinate segmentation block switch, can be under electrical network normal running (operation) conditions, without changing the mode of connection, the normal duty electric current that can utilize link tester to cross, normally carrying out ice-melt to realizing in customer power supply to transmission line.Avoid icing to work the mischief to power circuit.High resistant steel core ice-melt wire uses flexibly, consumes less energy consumption, fitting operation is simple, reliability is high, cost of investment is low, be convenient to operation maintenance management.
Brief description of the drawings
Fig. 1 is the schematic cross-section of high value steel core ice-melt wire described in the utility model;
Fig. 2 is fundamental diagram of the present utility model.
Embodiment
Embodiment one, illustrate present embodiment in conjunction with Fig. 1 and Fig. 2, high value steel core ice-melt wire comprises share split plain conductor 1, insulating barrier 2, high value share split steel strand heart yearn 3 and block switch 4,
From inside to outside layering strand system successively of high value share split steel strand heart yearn 3, described high value share split steel strand heart yearn 3 is positioned at insulating barrier 2 inner sides,
Share split plain conductor 1 from inside to outside successively layering twist built in insulating barrier 2 outsides,
The tensile strength of the high value share split steel strand heart yearn 3 described in present embodiment meets the national standard of dimension wire steel core, and the maximum ice melting current of wire that the transmission line electric current de-icing technology directive/guide Q/GDW716-2012 standard of promulgating according to State Grid Corporation of China provides and the economical operation electric current of each specification wire can calculate the steel strand core resistance value of this high value share split steel strand heart yearn 3.
Determining of the steel strand core resistance value of high value share split steel strand heart yearn 3:
The maximum ice melting current value of the LGJ type wire providing according to the Q/GDW716-2012 of State Grid Corporation of China " transmission line electric current de-icing technology directive/guide ", calculates the ice-melt power P t of every meter of wire:
Pt＝Ir
2*R
The power that in formula, Pt should provide for every meter of wire ice-melt, the maximum ice melting current that Ir provides for " transmission line electric current de-icing technology directive/guide ", R is the DC resistance of ice-melt wire.
According to wire ice-melt power P t, calculate the steel core DC resistance rG of the high value steel core ice-melt wire of different size again:
rG,＝Pt/If
2
I in formula
fload current value If while normally operation for ice-melt wire:
If＝Sj*J
S in formula
jfor conductor cross-section area, unit is mm
2, J is that economic current density gets 0.8, unit is A/mm
2.
The steel strand core resistance value of the high value share split steel strand heart yearn 3 of different size is different, and every kind of specification wire all needs to calculate separately the resistance value that steel core should configure man-hour adding.
When normal power supply moves in the present embodiment, all conduction loaded currents of high value share split steel strand heart yearn 3 and share split plain conductor 1.In the time that line conductor needs ice-melt, disconnect share split plain conductor 1 by the block switch 4 being located on outer layer conductor, circuit running current is all passed through from high value share split steel strand heart yearn 3, make high value share split steel strand heart yearn 3 produce the required heat energy of ice-melt, rising conductive line surfaces temperature is melted the icing on wire.The segmentation block switch 4 that closes after ice-melt completes recovers the operation of wire total cross-section current-carrying.
High value steel core ice-melt wire comprises two conductor circuits, and a conductor circuit is high value share split steel strand heart yearn 3, and this loop is for straight-through; Another conductor circuit is that share split plain conductor 1 and block switch 4 are in series.Between two conductor circuits, insulate, be connected in one end of DC ice-melting waypoint block switch 4 simultaneously with one end of conventional wires 5 and one end of high value share split steel strand heart yearn 3, the other end of block switch 4 is only connected with share split plain conductor 1.Block switch 4 can be installed on waypoint line tension shaft tower, also can below shaft tower, set up a switch stand is installed.
Present embodiment is under the condition of transmission of electricity circuit running current, by disconnecting outer current carrying conductor.Allow circuit running current only flow through high value steel core, make the required heat of steel core generation wire ice-melt reach the object of ice-melt.It can be under circuit normal running (operation) conditions, and in not affecting customer power supply, segmentation realizes the deicing of overhead power transmission line conductor.The harm of avoiding icing to cause electricity overhead power transmission line.
The difference of the high value steel core ice-melt wire described in embodiment two, present embodiment and embodiment one is, described block switch 4 is 0.5～35KV electric pressure switch or disconnecting link.
In present embodiment, high value steel core insulating barrier 2 withstand voltage Ur's is definite, can must not be greater than according to the voltage drop of deicing processes line powering the requirement of rated voltage 8%.Otherwise will affect normal power supply.Calculate the insulating barrier withstand voltage that uses the high resistant steel core ice-melt wire in different electric pressure circuits.The withstand voltage Ur of insulating barrier 2 is 11.55% of circuit working voltage.
Claims (2)
1. high value steel core ice-melt wire, is characterized in that: it comprises share split plain conductor (1), insulating barrier (2), high value share split steel strand heart yearn (3) and block switch (4),
From inside to outside layering strand system successively of high value share split steel strand heart yearn (3), described high value share split steel strand heart yearn (3) is positioned at insulating barrier (2) inner side,
Share split plain conductor (1) from inside to outside successively layering strand built in insulating barrier (2) outside,
Block switch (4) is connected in the middle of share split plain conductor (1).
2. high value steel core ice-melt wire according to claim 1, is characterized in that: described block switch (4) is 0.5～35KV electric pressure switch or disconnecting link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420008841.2U CN203689973U (en) | 2014-01-07 | 2014-01-07 | High-resistance steel core ice-melting lead |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420008841.2U CN203689973U (en) | 2014-01-07 | 2014-01-07 | High-resistance steel core ice-melting lead |
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| Publication Number | Publication Date |
|---|---|
| CN203689973U true CN203689973U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420008841.2U Expired - Fee Related CN203689973U (en) | 2014-01-07 | 2014-01-07 | High-resistance steel core ice-melting lead |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730201A (en) * | 2014-01-07 | 2014-04-16 | 国家电网公司 | High-resistance steel core ice melting wire |
| CN106803442A (en) * | 2016-12-15 | 2017-06-06 | 河海大学 | Cold-resistant high-strength pulling-resisting cable |
| CN112102984A (en) * | 2020-09-02 | 2020-12-18 | 永州电力勘测设计院有限公司 | Novel steel core ice melting insulated wire and ice melting system and method thereof |
-
2014
- 2014-01-07 CN CN201420008841.2U patent/CN203689973U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730201A (en) * | 2014-01-07 | 2014-04-16 | 国家电网公司 | High-resistance steel core ice melting wire |
| CN106803442A (en) * | 2016-12-15 | 2017-06-06 | 河海大学 | Cold-resistant high-strength pulling-resisting cable |
| CN112102984A (en) * | 2020-09-02 | 2020-12-18 | 永州电力勘测设计院有限公司 | Novel steel core ice melting insulated wire and ice melting system and method thereof |
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| 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: 20140702 Termination date: 20190107 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |