CN103151745A - Method for deicing by connecting double-side deicing overhead ground wires in series - Google Patents
Method for deicing by connecting double-side deicing overhead ground wires in series Download PDFInfo
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- CN103151745A CN103151745A CN2013100542208A CN201310054220A CN103151745A CN 103151745 A CN103151745 A CN 103151745A CN 2013100542208 A CN2013100542208 A CN 2013100542208A CN 201310054220 A CN201310054220 A CN 201310054220A CN 103151745 A CN103151745 A CN 103151745A
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Abstract
The invention discloses a method for deicing by connecting double-side deicing overhead ground wires in series. Deicing is carried out through a method that an overhead ground wire is connected with a power transmission phase line in series, or after being connected in parallel, two overhead ground wires are connected with the power transmission phase line in series, but the power transmission phase line must be cut off under the condition. The implementation objects of the method are two composite overhead ground wires; each overhead ground wire comprises an outer stranding layer, an inner stranding layer and an insulation wire; in a double-side ground wire power grid, the insulation wires of the two composite overhead ground wires are connected in series to form a loop; one end of a deicing section shorts out; the other end of the deicing section is connected with two electrodes of a deicing power source; and heat is generated by insulation wires through direct current of a direct-current deicing power source. With the adoption of the composite overhead ground wire with one insulation wire, self-circulation de-icing is realized, namely, the insulation wires in the double-side ground wires are connected in series for deicing; when the ground wire is deiced, a power transmission circuit needs not to be cut off; and the series direct-current resistance of the two insulation wires is not high, and the requirement on the volume of the direct-current deicing power source is not high, so that the method is easy to realize.
Description
Technical field
The present invention relates to overhead ground wire de-icing technology field, but the method for especially a kind of bilateral ice-melt composite overhead ground wire series connection ice-melt.
Background technology
The south China local climate is moist, often falls sleet winter, and transmission pressure very easily covers glaze under low temperature, and is larger compared to dry northern common snow river in Jiangsu Province which flows into the Huangpu River of Shanghai density, difficult drop-off more, and the disaster of bringing to electrical network is more severe.In January, 2008 south on a large scale freezing disaster brought huge economic loss, also exposed China in the deficiency of the inside, transmission line ice-melt field.
Though overhead ground wire and transmission pressure are located under same environment, the current-carrying heating of transmission pressure own is therefore the thickness on transmission pressure head and shoulders above of the ice covering thickness on overhead ground wire generally more easily fractures.The ground wire that fractures may cause short circuit or the earth fault of transmission line, has increased the risk of discharging between lead wire and earth wire.Therefore, the anti-ice de-icing technology of ground wire has received increasing concern.
Transmission pressure DC ice melting technology is introduced in the overhead ground wire ice-melt, can adopt the mode ice-melt of connecting with a transmission of electricity phase line after an overhead ground wire or two overhead ground wire parallel connections, but transmission line must be stopped transport in this case, bring greatly inconvenience for the scheduling of electrical network, can not satisfy the requirement of power supply reliability; Perhaps common overhead ground wire is connected to a side of ice-melt power supply, very high to the requirement of ice-melt power supply capacity because ground resistance is very large with the de-icing method in the earth formation loop, so uneconomical even unfeasible in practice; Simultaneously, with the ice-melt of simply connecting of two aluminium-clad steel wires in overhead ground wire, also be difficult to greatly implement because of its resistance.
Summary of the invention
Technical problem to be solved by this invention is to overcome the defective that above-mentioned prior art exists, but provide a kind of method of bilateral ice-melt composite overhead ground wire series connection ice-melt, when making the bilateral ground wire deicing, transmission line does not need to stop transport and not high to the capacity requirement of DC ice melting power supply, is easy to realize.
for this reason, the present invention adopts following technical scheme: but the method for a kind of bilateral ice-melt composite overhead ground wire series connection ice-melt, it is characterized in that, the objective for implementation of the method is two composite overhead ground wires, every composite overhead ground wire comprises outer twisted layer, interior twisted layer and one insulated conductor, in bilateral ground wire electrical network, the insulated conductor series connection of two composite overhead ground wires forms a loop, at ice-melt Duan Yiduan short circuit, the two poles of the earth at another termination DC ice melting power supply of ice-melt section, direct current by the DC ice melting power supply makes insulated conductor produce heat, thereby make the ice dissolution that covers on composite overhead ground wire.Ice-melt power supply output DC stream can be avoided the impact of circuit induction reactance, has reduced the requirement to the ice-melt power supply capacity.
Further, described composite overhead ground wire comprises outer twisted layer and interior twisted layer, described outer twisted layer is comprised of the outer aluminium-clad steel wire that multiply is circumferential distribution, and described interior twisted layer is comprised of the unlined aluminium steel clad wire that multiply is circumferential distribution, and described one insulated conductor twists in interior twisted layer.Consider the insulated conductor lightning protection not as good as aluminium-clad steel wire, operated by rotary motion is avoided directly being struck by lightning in ground wire inner (during namely strand enters interior twisted layer).
Further, described insulated conductor is the copper conductor of surperficial wrap insulate layer, and the resistance of copper is less, and is not high to the capacity requirement of DC ice melting power supply, is easy to realize.The wire diameter of insulated conductor and the thickness of insulating barrier calculate according to thermal capacity, and it is withstand voltage that insulating barrier satisfies 10kV.
Further, described DC ice melting power supply is continuously adjustable power supply, adjusts period according to actual icing situation and ice-melt, thereby ice-melt time and energy loss are weighed optimization.
Further, the earthing mode of described composite overhead ground wire is pointwise ground connection or insulation completely on the ice-melt section, and pointwise ground connection can strengthen lightning protection effect, and insulation completely can reduce circulation loss.
Further, be compounded with fiber unit in described composite overhead ground wire, utilize fiber unit to carry out optical fiber communication or optical fiber temperature-measurement.
Beneficial effect of the present invention is: the composite overhead ground wire that contains one insulated conductor has been realized the self-loopa ice-melt, i.e. the series connection of insulated conductor in bilateral ground wire ice-melt, and during ground wire deicing, the transmission of electricity circuit does not need to stop transport; The series direct current resistance of two strand insulation wires is little, and is not high to the capacity requirement of DC ice melting power supply, is easy to realize.
Description of drawings
Fig. 1 is the cross sectional representation of composite overhead ground wire of the present invention.
Fig. 2 is the winding diagram of bilateral ground wire of the present invention series connection de-icing method, employing be the earthing mode of ground wire pointwise ground connection.
Fig. 3 is the winding diagram of bilateral ground wire of the present invention series connection de-icing method, employing be ground wire earthing mode of insulation completely on the ice-melt section.
In figure, 1,2-composite overhead ground wire, 3,4-insulated conductor, 5, the 6-tower that continues, the strain insulator string of 7-band gap, 8-suspension insulator, the outer aluminium-clad steel wire of 9-, 10-unlined aluminium steel clad wire, 11-center aluminium-clad steel wire, 12-DC ice melting power supply.
Embodiment
Below in conjunction with Figure of description, the present invention is described in further detail.
Composite overhead ground wire 2 as shown in Figure 1, it is formed by the center aluminium-clad steel wire 11 strand systems that 12 strands of outer aluminium-clad steel wires 9,5 strands of unlined aluminium steel clad wires 10,1 strand insulation wire 3 and one are positioned at the ground wire center, 12 strands of outer aluminium-clad steel wires that are circumferential distribution form outer twisted layer, 5 strands of unlined aluminium steel clad wires that are circumferential distribution form interior twisted layer, and described one insulated conductor twists in interior twisted layer.The structure of composite overhead ground wire 1 is identical with the structure of composite overhead ground wire 2.
The principle of the inventive method as shown in Figure 2, in an ice-melt section, with the composite overhead ground wire 2 of one insulated conductor 3 and with the composite overhead ground wire 1 of one insulated conductor 4 through several towers 6 that continue, composite overhead ground wire both can pointwise ground connection, as shown in Figure 2; Also can insulate completely as required, as shown in Figure 3.
The composite overhead ground wire 1 and 2 of drawing by the strain insulator string 7 of band gap at tower 5 places of continuing, insulated conductor 3 wherein and the 4 side short circuits in the ice-melt section, opposite side is connected with the both positive and negative polarity of corresponding DC ice melting power supply.
Calculate maximum ice melting current and minimum ice melting current according to influencing factors such as line parameter circuit value, outside air temperature, air humidity, wind speed, select as required suitable ice melting current; It is continuously adjustable requiring the size of current of ice-melt DC power supply, can reasonably adjust according to the stage of icing situation and ice-melt, has simultaneously the effect of anti-ice and ice-melt, makes in ice-melt time and ice-melt power consumption to be optimized.
Claims (6)
1. but the method for bilateral ice-melt composite overhead ground wire series connection ice-melt, it is characterized in that, the objective for implementation of the method is two composite overhead ground wires, every composite overhead ground wire comprises outer twisted layer, interior twisted layer and one insulated conductor, in bilateral ground wire electrical network, the insulated conductor series connection of two composite overhead ground wires forms a loop, at ice-melt Duan Yiduan short circuit, the two poles of the earth at another termination DC ice melting power supply of ice-melt section, direct current by the DC ice melting power supply makes insulated conductor produce heat, thereby makes the ice dissolution that covers on composite overhead ground wire.
2. but the method for bilateral ice-melt composite overhead ground wire according to claim 1 series connection ice-melt, it is characterized in that, described composite overhead ground wire comprises outer twisted layer and interior twisted layer, described outer twisted layer is comprised of the outer aluminium-clad steel wire that multiply is circumferential distribution, described interior twisted layer is comprised of the unlined aluminium steel clad wire that multiply is circumferential distribution, and described one insulated conductor twists in interior twisted layer.
3. but the method for bilateral ice-melt composite overhead ground wire according to claim 1 and 2 series connection ice-melt, it is characterized in that, described insulated conductor is the copper conductor of surperficial wrap insulate layer, the wire diameter of insulated conductor and the thickness of insulating barrier calculate according to thermal capacity, and it is withstand voltage that insulating barrier satisfies 10kV.
4. but the method for bilateral ice-melt composite overhead ground wire according to claim 1 and 2 series connection ice-melt, it is characterized in that, described DC ice melting power supply is continuously adjustable power supply, adjust period according to actual icing situation and ice-melt, thereby ice-melt time and energy loss are weighed optimization.
5. but the method for bilateral ice-melt composite overhead ground wire series connection ice-melt according to claim 1 and 2, is characterized in that, the earthing mode of described composite overhead ground wire is pointwise ground connection or insulation completely on the ice-melt section.
6. but the method for bilateral ice-melt composite overhead ground wire series connection ice-melt according to claim 1 and 2, is characterized in that, is compounded with fiber unit in described composite overhead ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100542208A CN103151745A (en) | 2013-02-20 | 2013-02-20 | Method for deicing by connecting double-side deicing overhead ground wires in series |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100542208A CN103151745A (en) | 2013-02-20 | 2013-02-20 | Method for deicing by connecting double-side deicing overhead ground wires in series |
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| CN103151745A true CN103151745A (en) | 2013-06-12 |
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| CN2013100542208A Pending CN103151745A (en) | 2013-02-20 | 2013-02-20 | Method for deicing by connecting double-side deicing overhead ground wires in series |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103390874A (en) * | 2013-07-24 | 2013-11-13 | 国家电网公司 | Deicing method for deicing optical fiber composite overhead ground wire wound by insulated wires |
| CN105207161A (en) * | 2015-10-30 | 2015-12-30 | 国网浙江省电力公司电力科学研究院 | Double earth wire ice melting system |
| CN106329385A (en) * | 2015-07-03 | 2017-01-11 | 中国电力科学研究院 | OPGW icing thickness measuring method and measuring device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60216711A (en) * | 1984-04-10 | 1985-10-30 | 株式会社フジクラ | Method of fusing snow of aerial ground wire |
| CN101834016A (en) * | 2010-05-13 | 2010-09-15 | 湖南省电力公司试验研究院 | Deicing ground wire with high-voltage heavy current |
| CN202110837U (en) * | 2011-07-06 | 2012-01-11 | 史云强 | Embedded ground wire used for high-temperature high-voltage large current to pass through for deicing |
| CN102360610A (en) * | 2011-09-14 | 2012-02-22 | 湖南金杯电缆有限公司 | Ice-melting type overhead earth wire |
| CN102789840A (en) * | 2012-08-09 | 2012-11-21 | 江苏宏图高科技股份有限公司 | Ice melting optical fiber composite overhead ground wire or ice melting ground wire, ice melting method and matched device |
| CN102915808A (en) * | 2012-11-14 | 2013-02-06 | 中天日立光缆有限公司 | Optical fiber composite overhead ground wire capable of melting ice |
-
2013
- 2013-02-20 CN CN2013100542208A patent/CN103151745A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60216711A (en) * | 1984-04-10 | 1985-10-30 | 株式会社フジクラ | Method of fusing snow of aerial ground wire |
| CN101834016A (en) * | 2010-05-13 | 2010-09-15 | 湖南省电力公司试验研究院 | Deicing ground wire with high-voltage heavy current |
| CN202110837U (en) * | 2011-07-06 | 2012-01-11 | 史云强 | Embedded ground wire used for high-temperature high-voltage large current to pass through for deicing |
| CN102360610A (en) * | 2011-09-14 | 2012-02-22 | 湖南金杯电缆有限公司 | Ice-melting type overhead earth wire |
| CN102789840A (en) * | 2012-08-09 | 2012-11-21 | 江苏宏图高科技股份有限公司 | Ice melting optical fiber composite overhead ground wire or ice melting ground wire, ice melting method and matched device |
| CN102915808A (en) * | 2012-11-14 | 2013-02-06 | 中天日立光缆有限公司 | Optical fiber composite overhead ground wire capable of melting ice |
Non-Patent Citations (1)
| Title |
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| 杨济海 等: "对抗覆冰光纤复合架空地线的思考", 《电力系统通信》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103390874A (en) * | 2013-07-24 | 2013-11-13 | 国家电网公司 | Deicing method for deicing optical fiber composite overhead ground wire wound by insulated wires |
| CN106329385A (en) * | 2015-07-03 | 2017-01-11 | 中国电力科学研究院 | OPGW icing thickness measuring method and measuring device |
| CN105207161A (en) * | 2015-10-30 | 2015-12-30 | 国网浙江省电力公司电力科学研究院 | Double earth wire ice melting system |
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Application publication date: 20130612 |