CN102255274A - Direct-current ice melting method for overhead ground wire and composite optical fiber ground wire - Google Patents
Direct-current ice melting method for overhead ground wire and composite optical fiber ground wire Download PDFInfo
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Abstract
The invention relates to a direct-current ice melting method for an overhead ground wire and a composite optical fiber ground wire. The direct-current ice melting device used by the direct-current ice melting method comprises a current converter, a direct-current side disconnecting link and a control protection system, wherein the whole line is electrically communicated with two insulating overhead ground wires or an insulating overhead ground wire and an insulating composite optical fiber ground wire in parallel, a phase conductor is used as a return line, the head ends of the two insulating ground wires are connected to the negative electrode of the current converter in the direct-current ice melting device through the direct-current side disconnecting link after being in short circuit, the tail ends of the two insulating ground wires are in short circuit with the tail end of any phase conductor in a three-phase alternating-current circuit needing ice melting, the any phase conductor is connected with the positive electrode of the current converter in the direct-current ice melting device through the direct-current side. The ice melting method of the direct current ice melting device can obviously reduce the voltage of the insulated ground wire to the ground voltage during ice melting, reduce the operating voltage requirements on the ground wire insulator and the parallel gap thereof, and greatly reduce the line loss caused by the overhead ground wire and the composite optical fiber ground wire.
Description
Technical field
The present invention is the DC ice melting method of a kind of overhead ground wire and composite fiber ground wire, belongs to the innovative technology that the power transmission network power line DC ice-melting is used.
Background technology
Along with the continuous deterioration of global climate, ice damage is serious all the more to the harm that transmission line causes.Particularly the ice damage at the beginning of 2008 has caused tremendous loss to China's electrical network.
Behind the ice damages in 2008, China electric power scientific worker has independently carried out the research and development of DC ice melting technology and device, successfully developed high power DC deicing device with complete independent intellectual property right, mainly comprise the band special rectifier transformer, be not with multiple patterns such as special rectifier transformer and vehicle-mounted removable, and then apply in the whole nation.
In January, 2011, be subjected to the consecutive low temperature sleet weather effect that congeals, the icing dangerous situation appears in the power transformating and supplying facility in most of area, Guizhou, backlands district, osmanthus, Guangxi, Guangdong Northern Guangdong Province and backlands district, the eastern regions of the Yunnan Province, Yunnan in succession in the south electric network power supply area, successively causes 1414 10kV and above circuit, 70 35kV and above transformer station to stop transport.2011 ice damages are extra heavy ice damages again that south electric network meets with after 2008.But suffer heavy losses, electrical network many places off-the-line or lonely network operation, subtract for load and compare in a large number with many circuit wire breaking and tower fallings, 500kV main grid structure in 2008,220kV and the above circuit accident of falling the tower do not take place during this ice damage, at county level and above city power outage does not take place, and has guaranteed power network safety operation and electric power regular supply.In the ice damages in 2011, the 19 cover DC de-icing devices that south electric network has been installed have obtained comprehensive actual combat check first, have brought into play enormous function, and accumulative total is to 110kV and above line ice-melting 227 times, wherein surplus the 500kV circuit 40 time.
Analyze from the damaged condition of ice damage accident in recent years, overhead ground wire and composite fiber ground wire (OPGW) are relatively more fragile in a transmission line links, and icing causes overhead ground wire and composite fiber ground wire (OPGW) to damage, and cause that line tripping stops transport.According to south electric network actual conditions in 2011, after solving the aerial condutor icing, ground wire icing and composite fiber ground wire (OPGW) recover to send electric chief factors of success after having become line tripping and having influenced the lead ice-melt.
Be different from aerial condutor, the common overhead ground wire of China mainly adopts graded insulation, one point earth mode, and composite fiber ground wire (being called for short OPGW) adopts basically by basic earthing mode, can't directly carry out ice-melt to overhead ground wire and composite fiber ground wire (OPGW).Because Ground wire with insulation ocver can significantly reduce transmission line loss, electric power scientific worker unanimity is in the research of carrying out this respect and practice both at home and abroad, and existing research and practical application show that overhead ground wire and composite fiber ground wire (OPGW) insulation operation are fully feasible.
Therefore, realize overhead ground wire and composite fiber ground wire (OPGW) DC ice melting,, ensure that the mains supply reliability has crucial meaning, economic benefit and social benefit highly significant improving the whole anti-icing ability of transmission line.
Summary of the invention
The objective of the invention is to consider the problems referred to above and the investment of a kind of reduction DC de-icing device is provided, easy to operate, the DC ice melting method of overhead ground wire that efficient is high and composite fiber ground wire.
Technical scheme of the present invention is: the DC ice melting method of overhead ground wire of the present invention and composite fiber ground wire; the used DC de-icing device of described DC ice melting method includes converter; the DC side disconnecting link; the control protection system; electrical communication two is thoroughly done away with the parallel connection of edge overhead ground wire completely; or one thoroughly do away with edge overhead ground wire and and thoroughly do away with edge composite fiber ground line parallel; with a phase conductor as the line of return; receive the negative pole of converter in the DC de-icing device behind the two eradication edge ground wire head end short circuits by the DC side disconnecting link; two thoroughly do away with edge ground wire end and the terminal short circuit of any phase conductor in the three-phase AC line that needs ice-melt; this any phase conductor is connected with the positive pole of converter in the DC de-icing device by the DC side disconnecting link; the control protection system is connected with converter, and described DC ice melting implementation method comprises the steps:
1) defines the transmission line of overhead ground wire and composite fiber ground wire deicing demand;
2) situation of this transmission line overhead ground wire and composite fiber ground wire is added up;
3) overhead ground wire poor conductor ground wire is replaced by the good conductor ground wire of resistivity basically identical completely, overhead ground wire is transform as the insulated static wire that is electrically connected through band parallel connection gaps insulator dielectric, maintenance completely, overhead ground wire road insulation completely over the ground during operate as normal, when be struck by lightning overhead ground wire or line fault caused occurring the transient state high voltage on the overhead ground wire, overhead ground wire was then by parallel connection gaps electrically conducting ground connection;
4) the composite fiber ground wire is transform as the insulated compound optical fiber ground wire that is electrically connected through band parallel connection gaps insulator dielectric, maintenance completely; Composite fiber ground wire road insulation completely over the ground during operate as normal; When be struck by lightning composite fiber ground wire or line fault caused the transient state high voltage occurring on the composite fiber ground wire, the composite fiber ground wire was then by parallel connection gaps electrically conducting ground connection;
5) overhead ground wire and the induced voltage of composite fiber ground wire under various operating modes to insulation carries out electro-magnetic transient calculating, adopts the method for lead, ground wire transposition that the induced voltage on overhead ground wire and the composite fiber ground wire is controlled in the 1.5kV;
6) before overhead ground wire and composite fiber ground wire are carried out ice-melt after insulation is transformed, this circuit is stopped transport, thoroughly do away with the edge ground wire with two, perhaps receive the negative pole of converter in the DC de-icing device behind an eradication edge ground wire and the eradication edge composite fiber ground wire head end short circuit by the DC side disconnecting link, end and the terminal short circuit of any phase conductor in the three-phase AC line that needs ice-melt, this any phase conductor is received the positive pole of converter in the DC de-icing device by the DC side disconnecting link;
7) close to the isolating switch and the circuit breaker of DC de-icing device power supply, setting DC de-icing device output DC stream reference value is that DC de-icing device allows minimum current, send the DC de-icing device unlock command, examine the DC de-icing device release and the DC de-icing device output current is risen to the design ice melting current after correct, wait on ground wire and the composite fiber ground wire icing back that comes off fully and recover transmission line and normally move.
Above-mentioned steps 2) situation of transmission line overhead ground wire and composite fiber ground wire is carried out statistical packages vinculum type, is connected and the ground connection statistics.
The present invention is owing to adopt the overhead ground wire that will have multiple earthing mode and multiple resistivity now to transform the resistivity all fronts electrical communication insulated static wire of basically identical completely as, to transform electrical communication insulated compound optical fiber ground wire completely by the composite fiber ground wire (OPGW) of basic ground connection as, when ice-melt with two thoroughly do away with edge overhead ground wires (perhaps an overhead ground wire and a composite fiber ground wire) in parallel, utilize a lead to carry out the structure of DC ice melting as the line of return.Ground wire with insulation ocver voltage to earth when the DC ice melting method of overhead ground wire of the present invention and composite fiber ground wire (OPGW) can significantly reduce ice-melt, reduction is to the working voltage requirement of ground wire insulator and parallel connection gaps thereof, make that ground wire, lead can shared same DC de-icing devices, make the DC ice melting of overhead ground wire and composite fiber ground wire (OPGW) become a reality.The DC ice melting method of overhead ground wire provided by the invention and composite fiber ground wire (OPGW) is convenient and practical, and the line loss that makes overhead ground wire and composite fiber ground wire cause reduces greatly.De-icing method of the present invention is easy to operate, the efficient height, and cost is low.
Description of drawings
Fig. 1 carries out the wiring schematic diagram of overhead ground wire and composite fiber ground wire (OPGW) DC ice melting method for the present invention utilizes 12 pulsating direct current deicing devices.
Fig. 2 carries out the wiring schematic diagram of overhead ground wire and composite fiber ground wire (OPGW) DC ice melting method for the present invention utilizes 6 pulsating direct current deicing devices.
Embodiment
The DC ice melting method of overhead ground wire of the present invention and composite fiber ground wire; the used DC de-icing device of described DC ice melting method includes converter 1; DC side disconnecting link 2; control protection system 3; electrical communication two is thoroughly done away with the parallel connection of edge overhead ground wire completely; or one thoroughly do away with edge overhead ground wire and and thoroughly do away with edge composite fiber ground line parallel; with a phase conductor as the line of return; receive the negative pole of converter 1 in the DC de-icing device behind the two eradication edge ground wire head end short circuits by DC side disconnecting link 2; two thoroughly do away with edge ground wire end and the terminal short circuit of any phase conductor in the three-phase AC line that needs ice-melt; this any phase conductor is connected with the positive pole of converter 1 in the DC de-icing device by DC side disconnecting link 2; control protection system 3 is connected with converter 1, and described DC ice melting implementation method comprises the steps:
(1) defines the transmission line of overhead ground wire and composite fiber ground wire (OPGW) ice-melt demand.
(2) to the situation of this transmission line overhead ground wire and composite fiber ground wire (OPGW), comprise line style, connection and ground connection etc., add up.
(3) overhead ground wire poor conductor ground wire is replaced by the good conductor ground wire of resistivity basically identical completely, overhead ground wire is transform as the insulated static wire that is electrically connected through band parallel connection gaps insulator dielectric, maintenance completely.
(4) composite fiber ground wire (OPGW) is transform as the insulated compound optical fiber ground wire (OPGW) that is electrically connected through band parallel connection gaps insulator dielectric, maintenance completely.
(5) overhead ground wire and the induced voltage of composite fiber ground wire (OPGW) under various operating modes to insulation carries out electro-magnetic transient calculating, adopts the method for lead, ground wire transposition that the induced voltage on overhead ground wire and the composite fiber ground wire (OPGW) is controlled in the 1.5kV.
(6) before overhead ground wire and composite fiber ground wire (OPGW) are carried out ice-melt after insulation is transformed, this circuit is stopped transport, to receive the DC de-icing device negative pole behind two eradication edge ground wires (perhaps thoroughly doing away with an edge ground wire and an eradication edge composite fiber ground wire) the head end short circuit, terminal and A be (or B phase or C phase) wire end short circuit mutually, and A phase (or B phase or C phase) lead is received the DC de-icing device positive pole.
(7) close to the isolating switch and the circuit breaker of DC de-icing device power supply, setting DC de-icing device output DC stream reference value is that DC de-icing device allows minimum current, send the DC de-icing device unlock command, examine the DC de-icing device release and the DC de-icing device output current is risen to the design ice melting current after correct, wait two ground wires (perhaps thoroughly do away with edge ground wire and thoroughly do away with edge composite fiber ground wire) and go up the icing back that comes off fully and recover transmission line and normally move.
Be described as follows below in conjunction with drawings and Examples:
Embodiment:
Certain 500kV AC power line line conductor ice-melt relevant parameter calculates as shown in table 1, and the overhead ground wire basic condition is as shown in table 2.As two overhead ground wires not being carried out all fronts electrical communication and insulation transformation, can't carry out DC ice melting work.As only carrying out all fronts electrical communication, and overhead ground wire is not changed into the ground wire of resistivity basically identical, the direct current pressure drop that needs during then to ground wire deicing is about 74.1kV(and sees Table 3), far above the 20.4kV that the lead ice-melt needs, can't adopt same DC de-icing device to realize lead and ground wire deicing.For carrying out DC ice melting, carry out following work to this transmission line:
(1) this transmission line wire ice-melt parameter is as shown in table 1, ice melting current 4389A, and the direct current pressure drop is 20.4kV.
(2) this transmission line overhead ground wire basic condition is as shown in table 2, and this overhead ground wire comprises two kinds of resistivity ground wires: poor conductor steel strand wire GJ-80 and good conductor aluminum-cladding stranded wire LBGJ-120-40AC, resistivity and ice melting current are widely different.
(3) poor conductor steel strand wire GJ-80 in the overhead ground wire is replaced by good conductor aluminum-cladding stranded wire LBGJ-120-40AC, overhead ground wire is transform as the insulated static wire that is electrically connected through band parallel connection gaps insulator dielectric, maintenance completely.
(4) induced voltage of overhead ground wire under various operating modes to insulation carries out electro-magnetic transient calculating, adopts the method for lead, ground wire transposition that the induced voltage on the overhead ground wire is controlled in the 1.5kV;
(5) after the above measure of employing, adopt the ice-melt mode of connection shown in Figure 1 (two ground line parallels, with a phase conductor as the line of return) time DC ice melting pressure drop that needs as shown in table 4, before overhead ground wire is carried out ice-melt after insulation is transformed, this circuit is stopped transport, to receive the negative pole of converter in the DC de-icing device (1) by DC side disconnecting link (2) behind the two eradication edge ground wire head end short circuits, the terminal short circuit of terminal and A phase conductor, the A phase conductor is received the positive pole of converter in the DC de-icing device (1) by DC side disconnecting link (2), as shown in Figure 1, DC side disconnecting link S1, S2, the S4 closure, S3 disconnects.The direct current pressure drop that needs during ground wire deicing is about 14.3kV, and being lower than the lead ice-melt needs the direct current pressure drop, can the shared direct current deicing device of lead.During ground wire deicing over the ground ceiling voltage be about 14.3kV/2=7.2kV, ground wire insulation parallel connection gaps can design in view of the above.
(7) close to the isolating switch and the circuit breaker of DC de-icing device power supply, setting DC de-icing device output DC stream reference value is that DC de-icing device allows minimum current, send the DC de-icing device unlock command, examine the DC de-icing device release and the DC de-icing device output current is risen to design ice melting current 520A after correct, wait on the ground wire icing back that comes off fully and recover transmission line and normally move.
Certain 500kV lead of table 1 ice-melt parameter of being correlated with
| Section | Line style | Length (km) | D.C. resistance in the time of 20 ℃ (Ω/km) | Minimum ice melting current (A) | DC ice melting needs capacity (MW) | Direct current pressure drop (kV) |
| The 1#-361# tower | 6×LGJ-300 | 144.69 | 0.01606 | 4389.6 | 89.55 | 20.4 |
Annotate: 1. minimum ice melting current design conditions are ice thickness 10mm, temperature-5 ℃, wind speed 5m/s, finished ice-melt in 1 hour; 2. lead adopts two lead series connection back access DC de-icing devices to carry out ice-melt.
Certain 500kV overhead ground wire basic condition of table 2
Annotate: the ice melting current design conditions are ice thickness 10mm, temperature-5 ℃, wind speed 5m/s, finished ice-melt in 1 hour.
DC ice melting parameter when table 3 is kept former model overhead ground wire
| Section | The overhead ground wire model | 20 ℃ of D.C. resistances (Ω/Km) | Length (km) | Ice melting current (A) | Each section resistance (Ω) | Direct current pressure drop (kV) |
| 1#-24# | LBGJ-120-40AC | 0.3629 | 10.45 | 260 | 3.8 | 1.0 |
| 24#-333# | GJ-80 | 2.24 | 122.61 | 260 | 274.6 | 71.4 |
| 333#-361# | LBGJ-120-40AC | 0.3629 | 11.63 | 260 | 4.2 | 1.1 |
| The line of return | 6×LGJ-300 | 0.01606 | 144.69 | 260 | 2.3 | 0.6 |
Annotate: 1. ice melting current adopts the minimum ice melting current of LBGJ-120-40AC; 2. the ground wire deicing mode is to return by a phase conductor behind two ground line parallels.
Table 4 adopts the DC ice melting parameter behind the same model overhead ground wire
| Section | The overhead ground wire model | 20 ℃ of D.C. resistances (Ω/Km) | Length (km) | Ice melting current (A) | Each section resistance (Ω) | Direct current pressure drop (kV) |
| 1#-24# | LBGJ-120-40AC | 0.3629 | 10.45 | 260 | 3.8 | 1.0 |
| 24#-333# | LBGJ-120-40AC | 0.3629 | 122.61 | 260 | 44.5 | 11.6 |
| 333#-361# | LBGJ-120-40AC | 0.3629 | 11.63 | 260 | 4.2 | 1.1 |
| The line of return | 6×LGJ-300 | 0.01606 | 144.69 | 260 | 2.3 | 0.6 |
Annotate: 1. ice melting current adopts the minimum ice melting current of LBGJ-120-40AC; 2. the ground wire deicing mode is to return by a phase conductor behind two ground line parallels.
Claims (2)
1. the DC ice melting method of overhead ground wire and composite fiber ground wire; the used DC de-icing device of described DC ice melting method includes converter (1); DC side disconnecting link (2); control protection system (3); electrical communication two is thoroughly done away with the parallel connection of edge overhead ground wire completely; or one thoroughly do away with edge overhead ground wire and and thoroughly do away with edge composite fiber ground line parallel; with a phase conductor as the line of return; receive the negative pole of converter in the DC de-icing device (1) by DC side disconnecting link (2) behind the two eradication edge ground wire head end short circuits; two thoroughly do away with edge ground wire end and the terminal short circuit of any phase conductor in the three-phase AC line that needs ice-melt; this any phase conductor is connected with the positive pole of converter (1) in the DC de-icing device by DC side disconnecting link (2); control protection system (3) is connected with converter (1), it is characterized in that described DC ice melting implementation method comprises the steps:
1) defines the transmission line of overhead ground wire and composite fiber ground wire deicing demand;
2) situation of this transmission line overhead ground wire and composite fiber ground wire is added up;
3) overhead ground wire poor conductor ground wire is replaced by the good conductor ground wire of resistivity basically identical completely, overhead ground wire is transform as the insulated static wire that is electrically connected through band parallel connection gaps insulator dielectric, maintenance completely, overhead ground wire road insulation completely over the ground during operate as normal, when be struck by lightning overhead ground wire or line fault caused occurring the transient state high voltage on the overhead ground wire, overhead ground wire was then by parallel connection gaps electrically conducting ground connection;
4) the composite fiber ground wire is transform as the insulated compound optical fiber ground wire that is electrically connected through band parallel connection gaps insulator dielectric, maintenance completely; Composite fiber ground wire road insulation completely over the ground during operate as normal; When be struck by lightning composite fiber ground wire or line fault caused the transient state high voltage occurring on the composite fiber ground wire, the composite fiber ground wire was then by parallel connection gaps electrically conducting ground connection;
5) overhead ground wire and the induced voltage of composite fiber ground wire under various operating modes to insulation carries out electro-magnetic transient calculating, adopts the method for lead, ground wire transposition that the induced voltage on overhead ground wire and the composite fiber ground wire is controlled in the 1.5kV;
6) before overhead ground wire and composite fiber ground wire are carried out ice-melt after insulation is transformed, this circuit is stopped transport, thoroughly do away with the edge ground wire with two, perhaps an eradication edge ground wire and is received the negative pole of converter in the DC de-icing device (1) by DC side disconnecting link (2) after thoroughly doing away with edge composite fiber ground wire head end short circuit, end and the terminal short circuit of any phase conductor in the three-phase AC line that needs ice-melt, this any phase conductor is received the positive pole of converter in the DC de-icing device (1) by DC side disconnecting link (2);
7) close to the isolating switch and the circuit breaker of DC de-icing device power supply, setting DC de-icing device output DC stream reference value is that DC de-icing device allows minimum current, send the DC de-icing device unlock command, examine the DC de-icing device release and the DC de-icing device output current is risen to the design ice melting current after correct, wait on ground wire and the composite fiber ground wire icing back that comes off fully and recover transmission line and normally move.
2. the DC ice melting method of overhead ground wire according to claim 1 and composite fiber ground wire is characterized in that above-mentioned steps 2) situation of transmission line overhead ground wire and composite fiber ground wire is carried out statistical packages vinculum type, is connected and the ground connection statistics.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102611061A (en) * | 2012-03-13 | 2012-07-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) |
| CN102611062A (en) * | 2012-03-13 | 2012-07-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for determining parameters of transmission line overhead ground wire direct-current ice-melting device |
| CN102780193A (en) * | 2012-07-06 | 2012-11-14 | 广东电网公司电力科学研究院 | Current ice-melting method for overhead ground wires of electric transmission line |
| CN102856869A (en) * | 2012-08-30 | 2013-01-02 | 中国电力工程顾问集团西南电力设计院 | Wiring method for realizing direct-current deicing of ground wire of converter station |
| CN103247992A (en) * | 2013-05-07 | 2013-08-14 | 陈广生 | DC deicing method for overhead ground wires and OPGWs in electric transmission lines |
| CN103296899A (en) * | 2013-06-20 | 2013-09-11 | 国家电网公司 | Direct-current voltage output mechanism of six-pulse-wave de-icing rectifier |
| CN103346518A (en) * | 2013-07-18 | 2013-10-09 | 国家电网公司 | Direct current deicing device for long-distance optical fiber composite overhead ground wire |
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| 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 |
| CN105207156A (en) * | 2014-06-16 | 2015-12-30 | 南京电力金具设计研究院有限公司 | Protection device for ground wire deicing automatic wiring device |
| CN105281275A (en) * | 2014-06-16 | 2016-01-27 | 南京电力金具设计研究院有限公司 | Electric control device applied to automatic wiring device for ground wire deicing |
| CN105322493A (en) * | 2014-06-16 | 2016-02-10 | 中国南方电网有限责任公司超高压输电公司 | Ground wire ice melting automatic wiring device |
| 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 |
| CN107368650A (en) * | 2017-07-19 | 2017-11-21 | 武汉大学 | The method that quadrature analysis formulates tower linear system system ice-melt strategy |
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| 张庆武等: "《特高压直流控制***融冰工作方式研究》", 《高电压技术》 * |
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| CN102611061A (en) * | 2012-03-13 | 2012-07-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) |
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| CN105322493B (en) * | 2014-06-16 | 2017-07-07 | 中国南方电网有限责任公司超高压输电公司 | A kind of ground wire deicing automatic connection device |
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| 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 |
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