CN102255274B - 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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- CN102255274B CN102255274B CN 201110221089 CN201110221089A CN102255274B CN 102255274 B CN102255274 B CN 102255274B CN 201110221089 CN201110221089 CN 201110221089 CN 201110221089 A CN201110221089 A CN 201110221089A CN 102255274 B CN102255274 B CN 102255274B
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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 direct current 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, caused huge loss to China's electrical network.
After 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 the high power DC deicing device with complete independent intellectual property right, mainly comprise the band special rectifier transformer, be not with the 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 of Guizhou most area in the south electric network power supply area, northern Guangxi area, Guangdong Northern Guangdong Province and Yunnan Northeastern Yunnan in succession, successively causes 1414 10kV and Above Transmission Lines, 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 falling tower, 500kV main grid structure with many circuit breakings in 2008 suffers heavy losses, electrical network many places off-the-line or lonely network operation, subtracts for load and compare in a large number, 220kV and the Above Transmission Lines accident of falling the tower do not occur during this ice damage, at county level and above city power outage does not occur, and has guaranteed power network safety operation and electric power regular supply.In 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 huge effect, and accumulative total is to 110kV and Above Transmission Lines ice-melt 227 times, and wherein the 500kV circuit is more than 40 times.
Analyze from the damaged condition of ice damage accident in recent years, overhead ground wire and composite fiber ground wire (OPGW) are links more fragile in transmission line, and icing causes overhead ground wire and composite fiber ground wire (OPGW) to damage, and cause that line tripping stops transport.According to the south electric network actual conditions of 2011, after solving the aerial condutor icing, ground wire icing and composite fiber ground wire (OPGW) recover the power transmission chief factors of success after having become line tripping and having affected the wire ice-melt.
Be different from aerial condutor, the common overhead ground wire of China mainly adopts graded insulation, one point grounding 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, the electric power scientific worker is unanimously at the research and practice that carries out this respect 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 feasible.
Therefore, realize overhead ground wire and composite fiber ground wire (OPGW) DC ice melting, to improving the whole anti-icing ability of transmission line, ensure that the mains supply reliability has very important meaning, economic benefit and social benefit highly significant.
Summary of the invention
The object of the invention is to consider the problems referred to above and a kind of reduction DC de-icing device investment is provided, easy to operate, the direct current ice melting method of the overhead ground wire that efficient is high and composite fiber ground wire.
technical scheme of the present invention is: the direct current ice melting method of overhead ground wire of the present invention and composite fiber ground wire, described direct current ice melting method DC de-icing device used includes converter, the DC side disconnecting link, 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 DC de-icing device after two eradication edge ground wire head end short circuits by the DC side disconnecting link, two thoroughly do away with any phase conductor end short circuit in edge ground wire ends and the three-phase AC line that needs ice-melt, this any phase conductor is connected with the positive pole of converter in DC de-icing device by the DC side disconnecting link, controlling protection system is connected with converter, described DC ice melting implementation method comprises the steps:
1) define the transmission line of overhead ground wire and composite fiber ground wire deicing demand;
2) situation of this power 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 basically identical good conductor ground wire of resistivity completely, overhead ground wire is transform as band parallel connection gaps insulator dielectric, keeps the insulated static wire of electrical connection completely, overhead ground wire road insulation completely over the ground during normal operation, when be struck by lightning overhead ground wire or line fault caused occurring the transient state high voltage on overhead ground wire, overhead ground wire was by parallel connection gaps electrically conducting ground connection;
4) the composite fiber ground wire is transform as the insulated compound optical fiber ground wire of band parallel connection gaps insulator dielectric, maintenance electrical connection completely; Composite fiber ground wire road insulation completely over the ground during normal operation; 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 by parallel connection gaps electrically conducting ground connection;
5) electro-magnetic transient calculating is carried out in overhead ground wire and the induced voltage of composite fiber ground wire under various operating modes of insulation, adopt the method for wire, ground wire transposition that the induced voltage on overhead ground wire and composite fiber ground wire is controlled in 1.5kV;
6) before overhead ground wire and composite fiber ground wire are carried out ice-melt after to Insulation Transformation, with this line outage, thoroughly do away with the edge ground wire with two, perhaps receive the negative pole of converter in DC de-icing device after an eradication edge ground wire and an eradication edge composite fiber ground wire head end short circuit by the DC side disconnecting link, end and any phase conductor end short circuit that needs in the three-phase AC line of ice-melt, this any phase conductor is received the positive pole of converter in DC de-icing device by the DC side disconnecting link;
7) close to 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 composite fiber ground wire the icing rear recovery transmission line that comes off fully and normally move.
Above-mentioned steps 2) power transmission line overhead ground wire and the composite fiber ground wire situation of being connected are added up comprise line style, connection and ground connection statistics.
The present invention is owing to adopting the overhead ground wire that will have multiple earthing mode and multiple resistivity now to transform the basically identical all fronts electrical communication insulated static wire in resistivity all fronts as, to transform by the composite fiber ground wire (OPGW) of basic ground connection electrical communication insulated compound optical fiber ground wire completely 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 wire to carry out the structure of DC ice melting as the line of return.Ground wire with insulation ocver voltage to earth when the direct current ice melting method of overhead ground wire of the present invention and composite fiber ground wire (OPGW) can significantly reduce ice-melt, the working voltage requirement of reduction to ground insulator and parallel connection gaps thereof, make ground wire, wire can share same DC de-icing device, make the DC ice melting of overhead ground wire and composite fiber ground wire (OPGW) become a reality.The direct current 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, and efficient is high, and cost is low.
Description of drawings
Fig. 1 is that the present invention utilizes 12 pulsating direct current deicing devices to carry out the wiring schematic diagram of overhead ground wire and composite fiber ground wire (OPGW) direct current ice melting method.
Fig. 2 is that the present invention utilizes 6 pulsating direct current deicing devices to carry out the wiring schematic diagram of overhead ground wire and composite fiber ground wire (OPGW) direct current ice melting method.
Embodiment
the direct current ice melting method of overhead ground wire of the present invention and composite fiber ground wire, described direct current ice melting method DC de-icing device used 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 DC de-icing device after two eradication edge ground wire head end short circuits by DC side disconnecting link 2, two thoroughly do away with any phase conductor end short circuit in edge ground wire ends and the three-phase AC line that needs ice-melt, this any phase conductor is connected with the positive pole of converter 1 in DC de-icing device by DC side disconnecting link 2, controlling protection system 3 is connected with converter 1, described DC ice melting implementation method comprises the steps:
(1) define the transmission line of overhead ground wire and composite fiber ground wire (OPGW) ice-melt demand.
(2) to the situation of this power 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 basically identical good conductor ground wire of resistivity completely, overhead ground wire is transform as band parallel connection gaps insulator dielectric, keeps the insulated static wire of electrical connection completely.
(4) composite fiber ground wire (OPGW) is transform as the insulated compound optical fiber ground wire (OPGW) of band parallel connection gaps insulator dielectric, maintenance electrical connection completely.
(5) overhead ground wire and the induced voltage of composite fiber ground wire (OPGW) under various operating modes of insulation are carried out electro-magnetic transient calculating, adopt the method for wire, ground wire transposition that the induced voltage on overhead ground wire and composite fiber ground wire (OPGW) is controlled in 1.5kV.
(6) before overhead ground wire and composite fiber ground wire (OPGW) are carried out ice-melt after to Insulation Transformation, with this line outage, receive the DC de-icing device negative pole after thoroughly doing away with edge ground wire (perhaps thoroughly doing away with edge ground wire and an eradication edge composite fiber ground wire) head end short circuit with two, end is received the DC de-icing device positive pole with A phase (or B phase or C phase) wire end short circuit, A phase (or B phase or C phase) wire.
(7) close to 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 the upper icing of two ground wires (perhaps thoroughly do away with edge ground wire and thoroughly do away with edge composite fiber ground wire) the rear recovery transmission line that comes off fully 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 basically identical ground wire of resistivity, the direct current pressure drop that needs during to ground wire deicing is about 74.1kV(and sees Table 3), the 20.4kV far above the wire ice-melt needs can't adopt same DC de-icing device to realize wire and ground wire deicing.For carrying out DC ice melting to this transmission line, carry out following work:
(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 power 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 overhead ground wire is replaced by good conductor aluminum-cladding stranded wire LBGJ-120-40AC, overhead ground wire is transform as band parallel connection gaps insulator dielectric, keeps the insulated static wire of electrical connection completely.
(4) electro-magnetic transient calculating is carried out in the induced voltage of overhead ground wire under various operating modes of insulation, adopt the method for wire, ground wire transposition that the induced voltage on overhead ground wire is controlled in 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 to Insulation Transformation, with this line outage, receive the negative pole of converter in DC de-icing device (1) by DC side disconnecting link (2) after thoroughly doing away with edge ground wire head end short circuit with two, end and A phase conductor end short circuit, the A phase conductor is received the positive pole of converter in DC de-icing device (1) by DC side disconnecting link (2), as shown in Figure 1, DC side disconnecting link S1, S2, S4 is closed, S3 disconnects.The direct current pressure drop that needs during ground wire deicing is about 14.3kV, needs the direct current pressure drop lower than the wire ice-melt, can share a direct current deicing device by wire.During ground wire deicing over the ground ceiling voltage be about 14.3kV/2=7.2kV, ground wire insulation parallel connection gaps can design accordingly.
(7) close to 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 ground wire the icing rear recovery transmission line that comes off fully and normally move.
Certain 500kV wire 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, completed ice-melt in 1 hour; 2. after wire adopts two wire series connection, the access DC de-icing device carries 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, completed 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 after two ground line parallels.
Table 4 adopts the DC ice melting parameter after 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 after two ground line parallels.
Claims (2)
1. the direct current ice melting method of an overhead ground wire and composite fiber ground wire, described direct current ice melting method DC de-icing device used includes converter (1), DC side disconnecting link (2), control protection system (3), two of electrical communication thoroughly do 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 any phase conductor as the line of return, receive the negative pole of converter in DC de-icing device (1) by DC side disconnecting link (2) after two eradication edge ground wire head end short circuits, two thoroughly do away with the described any phase conductor end short circuit in edge ground wire ends and the three-phase AC line that needs ice-melt, this any phase conductor is connected with the positive pole of converter (1) in DC de-icing device by DC side disconnecting link (2), controlling protection system (3) is connected with converter (1), it is characterized in that described direct current ice melting method comprises the steps:
1) define the transmission line of overhead ground wire and composite fiber ground wire deicing demand;
2) situation of this power 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 basically identical good conductor ground wire of resistivity completely, overhead ground wire is transform as the parallel connection gaps insulator dielectric, keeps the insulated static wire of electrical connection completely, overhead ground wire road insulation completely over the ground during normal operation, when be struck by lightning overhead ground wire or line fault caused occurring the transient state high voltage on overhead ground wire, overhead ground wire was by parallel connection gaps electrically conducting ground connection;
4) the composite fiber ground wire is transform as the insulated compound optical fiber ground wire of parallel connection gaps insulator dielectric, maintenance electrical connection completely; Composite fiber ground wire road insulation completely over the ground during normal operation; 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 by parallel connection gaps electrically conducting ground connection;
5) electro-magnetic transient calculating is carried out in overhead ground wire and the induced voltage of composite fiber ground wire under various operating modes of insulation, adopt the method for wire, ground wire transposition that the induced voltage on overhead ground wire and composite fiber ground wire is controlled in 1.5kV;
6) before overhead ground wire and composite fiber ground wire are carried out ice-melt after to Insulation Transformation, with this line outage, 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 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 described any phase conductor end short circuit that needs in the three-phase AC line of ice-melt, this any phase conductor is received the positive pole of converter in DC de-icing device (1) by DC side disconnecting link (2);
7) close to 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 composite fiber ground wire the icing rear recovery transmission line that comes off fully and normally move.
2. the direct current ice melting method of overhead ground wire according to claim 1 and composite fiber ground wire, is characterized in that above-mentioned steps 2) power transmission line overhead ground wire and the composite fiber ground wire situation of being connected are added up comprise line style, connection and ground connection statistics.
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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》.2008,第34卷(第11期),第2276-2282页. |
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