CN102255273A - Efficient direct current ice melting method - Google Patents
Efficient direct current ice melting method Download PDFInfo
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- CN102255273A CN102255273A CN2011102210886A CN201110221088A CN102255273A CN 102255273 A CN102255273 A CN 102255273A CN 2011102210886 A CN2011102210886 A CN 2011102210886A CN 201110221088 A CN201110221088 A CN 201110221088A CN 102255273 A CN102255273 A CN 102255273A
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- disconnecting link
- ice
- ice melting
- direct current
- icing
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Abstract
The invention relates to an efficient direct current ice melting method. A direct current ice melting device used for the direct current ice melting method comprises a converter, a direct current side disconnecting link and a control protective system; the three-phase input of the converter is connected to an alternating current power supply; and the direct current side positive electrode output and direct current side negative electrode output of the converter are respectively connected with a three-phase alternating current circuit which is required to be subjected to ice melting through the direct current side disconnecting link in direct current ice melting. The direct current ice melting method provided by the invention is characterized by carrying out direct current ice melting when the thickness of the ice covered on a circuit does not exceed the design value, and comprising the following steps: 1, switching in the direct current ice melting device to finish the two-phase lead ice melting after two leads are connected in series; and 2, switching in the direct current ice melting device to finish the ice melting of a third lead after the two leads subjected to ice melting are connected in parallel and then connected in series with the third lead. In the direct current ice melting process, through controlling the operation of the direct current side disconnecting link, the three leads are automatically switched and connected to the ice melting device for ice melting. By utilizing the ice melting method provided by the invention, the power transmission circuit ice melting can be realized safely and rapidly, the increase of ice covering the circuit can be slowed down effectively, and the power consumption is minimal.
Description
Technical field
The present invention is a kind of high efficiency DC ice melting method, belongs to the innovative technology that the power transmission network power line DC ice-melting is used.
Background technology
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, 2009, the Guizhou grid company is executed II line, 220 kilovolts of old lines of good fortune, 110 kilovolts of water trees of 110 kilovolts of good fortune ox lines plum line to 500 kilovolts of good fortune and has been carried out DC ice melting, Yunnan Power Grid Company has carried out DC ice melting to 220 kilovolts of clear big I lines, and Guangdong Power Grid company carries out DC ice melting to the logical plum line line of 110kV.In November, 2009, Yunnan Power Grid Company has carried out DC ice melting to 110 kilovolts big-and-middle T lines.The practical application at initial stage shows that the DC ice melting technology is the effective means of electrical network deicing.
In January, 2011, the large tracts of land icing attacks south electric network once more, the 19 cover DC de-icing devices of having installed in the south electric network have all been brought into play significant role, the above circuit of 110kV is carried out DC ice melting to be amounted to 227 times, wherein surplus the 500kV alternating current circuit 40 time, given full play to the power of DC de-icing device.
The icing overload causes transmission line tripping operation and device damage, the lead that relies on deicing naturally of weather to cause jumps and waves and also will cause transmission line tripping operation and device damage, and untimely ice-melt also may cause lead to jump and wave causing that also transmission facility damages.Simultaneously in the icing process, when lead certain icing after, center of gravity can be offset, lead takes place reverses and is convenient on each side further accumulated ice, quickens icing and increases, ice-melt timely is the important means that delays wire icing.According to heavy ice phase in 2008 statistics, the circuit icing daily thickens about 5mm, is no more than 10mm as need control circuit icing, just need finish an ice-melt to circuit in per 2 days.The practical application of DC de-icing device in 2011 has proved that also ice-melt efficiently in time is the important means that guarantees transmission line safety.
Summary of the invention
The object of the present invention is to provide a kind of easy to operate high efficiency DC ice melting method.
Technical scheme of the present invention is: high efficiency DC ice melting method of the present invention, the used DC de-icing device of described DC ice melting method includes converter, the DC side disconnecting link, the control protection system, the three-phase input of converter is connected to AC power, the DC side both positive and negative polarity output of converter is connected with the three-phase AC line that needs ice-melt by the DC side disconnecting link respectively when DC ice melting, the DC side disconnecting link comprises the first disconnecting link S1, the second disconnecting link S2, the 3rd disconnecting link S3, four blade lock S4, be connected with the negative pole of converter after the first disconnecting link S1 of DC side disconnecting link converter side and the second disconnecting link S2 parallel connection, be connected with the positive pole of converter after the 3rd disconnecting link S3 and the four blade lock S4 parallel connection; The first disconnecting link S1 in DC side disconnecting link line side is connected with DC ice-melting A, is connected with the B of DC ice-melting after the second disconnecting link S2 and the 3rd disconnecting link S3 parallel connection, and four blade lock S4 is connected with the C of DC ice-melting, and the DC ice melting method comprises the steps:
Start this circuit DC ice melting flow process when 1) the circuit ice covering thickness surpasses warning value;
2) DC de-icing device is inserted by the DC side disconnecting link in any two leads series connection back, with the first disconnecting link S1 and the 3rd disconnecting link S3 closure, the second disconnecting link S2 and four blade lock S4 disconnect, and promptly lead A, B insert DC de-icing device by first disconnecting link S1 in the DC side disconnecting link and the 3rd disconnecting link S3 series connection back mutually;
3) close circuit breaker QF behind the closed isolation switch K sends unlock command release DC de-icing device in control on the protection system, with the speed of 300-600A/s direct current is risen to this lead design ice melting current, waits the circuit icing and comes off; After the circuit icing comes off, send the locking order in control system, the deicing device output current is reduced to locking behind the minimum permissible value according to setting speed 300-600A/s;
4) carry out the branch closing operation of DC side disconnecting link after the DC de-icing device locking, closed second disconnecting link S2 and four blade lock S4, keep the first disconnecting link S1 closure, disconnect the 3rd disconnecting link S3, insert DC de-icing device finishing two phase conductor A of ice-melt and B back and the 3rd lead C back that is in series that is in parallel;
5) release DC de-icing device once more, and promote deicing device with the speed of 300-600A/s and output current to this line design ice melting current, wait the 3rd lead C phase icing and come off; After the circuit icing comes off, send the locking order in control system, the DC de-icing device output current is reduced to locking behind the minimum permissible value according to setting speed 300-600A/s, finishes the three-phase line ice-melt;
6) open deicing device AC side circuit breaker Q F, isolation switch K and DC side disconnecting link, recover to have finished the operation of DC ice-melting.
AC side circuit breaker Q F, isolation switch K remain closed in the said process.
Above-mentioned is 0.4-0.6 above icing ratio warning value.
DC de-icing device of the present invention is owing to adopt the structure that comprises converter, control protection equipment, DC side disconnecting link; DC ice melting method of the present invention is just to begin to carry out DC ice melting when the circuit ice covering thickness does not surpass design load as yet; the first step inserts DC de-icing devices with two leads series connection back and finishes two phase conductor ice-melts, and second step will be finished after the ice-melt two phase conductor parallel connections back access DC de-icing device of connect with the 3rd lead and be finished the 3rd lead ice-melt.By the operation of control DC side disconnecting link, do not need to disconnect AC side circuit breaker Q F and close isolation switch in the DC ice melting process, the automatic switchover three-phase conducting wire is connected to deicing device and carries out ice-melt.DC de-icing device of the present invention can guarantee three-phase line ice-melt fast and safely, has improved security of system and reliability greatly; Reduce the grid switching operation of switch tool and the work of ice-melt field connection simultaneously.DC ice melting method of the present invention is a kind of transmission line ice-melt that realizes safely and fast, can effectively delay the growth of circuit icing, consumed power is minimum, avoid icing surpass design load, DC ice melting or naturally the process of deicing cause the convenient and practical high efficiency DC ice melting method that equipment decreases.
Description of drawings
Fig. 1 is the connection diagram of 12 pulsating direct current deicing devices and DC ice-melting.
Fig. 2 is the connection diagram of 6 pulsating direct current deicing devices and DC ice-melting.
Embodiment
Be described as follows below in conjunction with drawings and Examples:
Embodiment 1:
The connection diagram of 12 pulsating direct current deicing devices and DC ice-melting is seen shown in Figure 1.Promptly this circuit is stopped transport after powerline ice-covering ratio reaches 0.4-0.6, the terminal short circuit of three-phase line three-phase, and head end inserts DC de-icing device.
The first disconnecting link S1 and the 3rd disconnecting link S3 in the DC side disconnecting link 2 among Fig. 1 that close, the second disconnecting link S2 and four blade lock S4 disconnect, and the QF that closes a switch behind the isolation switch K that closes promptly forms the ice-melt loop by A phase, B phase conductor and deicing device.The release DC de-icing device rises to this lead design ice melting current with 300-600A/s speed with direct current, waits the A phase, B phase conductor icing comes off; After A phase, B phase conductor icing come off, send the locking order in control system, the deicing device output current is reduced to locking behind the minimum permissible value according to setting speed 300-600A/s.
Carry out the branch closing operation of DC side disconnecting link after the DC de-icing device locking, will be after the second disconnecting link S2 and the four blade lock S4 closure disconnect the 3rd disconnecting link S3, soon finished after ice-melt A phase, the parallel connection of B phase conductor the access DC de-icing device afterwards of connect with the C phase conductor.
Release DC de-icing device once more, and promote deicing device with 300-600A/s speed and output current to this line design ice melting current, wait C phase conductor icing and come off; After C phase conductor icing comes off, send the locking order in control system, the DC de-icing device output current is reduced to locking behind the minimum permissible value according to setting speed 300-600A/s.
Separately separate isolation switch K behind the AC side circuit breaker Q F, separate the DC side first disconnecting link S1, the second disconnecting link S2 and four blade lock S4 again, recover to have finished the DC ice-melting operation at last.
Embodiment 2:
The connection diagram of 6 pulsating direct current deicing devices and DC ice-melting is seen shown in Figure 2.
Promptly this circuit is stopped transport after powerline ice-covering ratio reaches 0.4-0.6, the terminal short circuit of three-phase line three-phase, and head end inserts DC de-icing device.
Close DC side first disconnecting link S1 and the 3rd disconnecting link S3 closure among Fig. 1, the second disconnecting link S2 and four blade lock S4 disconnect, and the circuit breaker Q F that closes behind the AC side of the closing isolation switch K promptly forms the ice-melt loop by A phase, B phase conductor and deicing device.The release DC de-icing device rises to this lead design ice melting current with 300-600A/s speed with direct current, waits the A phase, B phase conductor icing comes off; After A phase, B phase conductor icing come off, send the locking order in control system, the deicing device output current is reduced to locking behind the minimum permissible value according to setting speed 300-600A/s.
Carry out the branch closing operation of DC side disconnecting link after the DC de-icing device locking, will be after the second disconnecting link S2 and the four blade lock S4 closure disconnect the 3rd disconnecting link S3, soon finished after ice-melt A phase, the parallel connection of B phase conductor the access DC de-icing device afterwards of connect with the C phase conductor.
Release DC de-icing device once more, and promote deicing device with 300-600A/s speed and output current to this line design ice melting current, wait C phase conductor icing and come off; After C phase conductor icing comes off, send the locking order in control system, the DC de-icing device output current is reduced to locking behind the minimum permissible value according to setting speed 300-600A/s.
Separately separate the K isolation switch behind the AC side circuit breaker Q F, separate the direct current first disconnecting link S1, the second disconnecting link S2 and four blade lock S4 again, recover to have finished the DC ice-melting operation at last.
Claims (3)
1. high efficiency DC ice melting method, the used DC de-icing device of described DC ice melting method includes converter (1), DC side disconnecting link (2), control protection system (3), the three-phase input of converter (1) is connected to AC power, the DC side both positive and negative polarity output of converter (1) is connected with the three-phase AC line that needs ice-melt by DC side disconnecting link (2) respectively when DC ice melting, DC side disconnecting link (2) comprises the first disconnecting link S1, the second disconnecting link S2, the 3rd disconnecting link S3, four blade lock S4, be connected with the negative pole of converter (1) after the first disconnecting link S1 of DC side disconnecting link (2) converter side and the second disconnecting link S2 parallel connection, be connected with the positive pole of converter (1) after the 3rd disconnecting link S3 and the four blade lock S4 parallel connection; The first disconnecting link S1 in DC side disconnecting link (2) line side is connected with DC ice-melting A, be connected with the B of DC ice-melting after the second disconnecting link S2 and the 3rd disconnecting link S3 parallel connection, four blade lock S4 is connected with the C of DC ice-melting, it is characterized in that the DC ice melting method comprises the steps:
Start this circuit DC ice melting flow process when 1) the circuit ice covering thickness surpasses warning value;
2) DC de-icing device is inserted by DC side disconnecting link (2) in any two leads series connection back, with the first disconnecting link S1 and the 3rd disconnecting link S3 closure, the second disconnecting link S2 and four blade lock S4 disconnect, and promptly lead A, B insert DC de-icing device by first disconnecting link S1 in the DC side disconnecting link (2) and the 3rd disconnecting link S3 series connection back mutually;
3) close circuit breaker QF behind the closed isolation switch K sends unlock command release DC de-icing device in control protection system (3), with the speed of 300-600A/s direct current is risen to this lead design ice melting current, waits the circuit icing and comes off; After the circuit icing comes off, send the locking order in control system, the deicing device output current is reduced to locking behind the minimum permissible value according to setting speed 300-600A/s;
4) carry out the branch closing operation of DC side disconnecting link (3) after the DC de-icing device locking, closed second disconnecting link S2 and four blade lock S4, keep the first disconnecting link S1 closure, disconnect the 3rd disconnecting link S3, insert DC de-icing device finishing two phase conductor A of ice-melt and B back and the 3rd lead C back that is in series that is in parallel;
5) release DC de-icing device once more, and promote deicing device with the speed of 300-600A/s and output current to this line design ice melting current, wait the 3rd lead C phase icing and come off; After the circuit icing comes off, send the locking order in control system, the DC de-icing device output current is reduced to locking behind the minimum permissible value according to setting speed 300-600A/s, finishes the three-phase line ice-melt;
6) open deicing device AC side circuit breaker Q F, isolation switch K and DC side disconnecting link, recover to have finished the operation of DC ice-melting.
2. high efficiency DC ice melting method according to claim 1 is characterized in that AC side circuit breaker Q F, isolation switch K remain closed in the said process.
3. high efficiency DC ice melting method according to claim 1 is characterized in that above-mentioned is 0.4-0.6 above icing ratio warning value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110221088 CN102255273B (en) | 2011-08-03 | 2011-08-03 | Efficient direct current ice melting method |
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| CN 201110221088 CN102255273B (en) | 2011-08-03 | 2011-08-03 | Efficient direct current ice melting method |
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| CN102255273B CN102255273B (en) | 2013-06-12 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841286A (en) * | 2012-08-07 | 2012-12-26 | 南京南瑞继保电气有限公司 | Method of judging reverse polarity of converter bridge control pulse cable |
| WO2013026253A1 (en) * | 2011-08-25 | 2013-02-28 | 南方电网科学研究院有限责任公司 | Power transmission line de-icing system and method thereof implemented using back braking operation during the whole process |
| CN103337821A (en) * | 2013-06-09 | 2013-10-02 | 南方电网科学研究院有限责任公司 | Overvoltage protection and insulation coordination design method of direct current ice melting system |
| CN103378574A (en) * | 2012-04-25 | 2013-10-30 | 南京南瑞继保电气有限公司 | Control protection method for achieving deicing function of direct-current deicing device |
| CN103500974A (en) * | 2013-10-17 | 2014-01-08 | 国家电网公司 | Output switchover system for DC (direct current)-based deicing device |
| CN113381629A (en) * | 2021-08-02 | 2021-09-10 | 南方电网科学研究院有限责任公司 | Current source type controllable direct current source ice melting circuit and device |
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| CN201332248Y (en) * | 2008-12-31 | 2009-10-21 | 许继集团有限公司 | DC ice melting switching device |
| CN101882774A (en) * | 2010-03-30 | 2010-11-10 | 南方电网技术研究中心 | DC de-icing device without special rectifier transformer and protection method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013026253A1 (en) * | 2011-08-25 | 2013-02-28 | 南方电网科学研究院有限责任公司 | Power transmission line de-icing system and method thereof implemented using back braking operation during the whole process |
| CN103378574A (en) * | 2012-04-25 | 2013-10-30 | 南京南瑞继保电气有限公司 | Control protection method for achieving deicing function of direct-current deicing device |
| CN103378574B (en) * | 2012-04-25 | 2016-03-02 | 南京南瑞继保电气有限公司 | DC de-icing device realizes the Control protection method of ice-melt function |
| CN102841286A (en) * | 2012-08-07 | 2012-12-26 | 南京南瑞继保电气有限公司 | Method of judging reverse polarity of converter bridge control pulse cable |
| CN103337821A (en) * | 2013-06-09 | 2013-10-02 | 南方电网科学研究院有限责任公司 | Overvoltage protection and insulation coordination design method of direct current ice melting system |
| CN103500974A (en) * | 2013-10-17 | 2014-01-08 | 国家电网公司 | Output switchover system for DC (direct current)-based deicing device |
| CN113381629A (en) * | 2021-08-02 | 2021-09-10 | 南方电网科学研究院有限责任公司 | Current source type controllable direct current source ice melting circuit and device |
| WO2023010651A1 (en) * | 2021-08-02 | 2023-02-09 | 南方电网科学研究院有限责任公司 | Current source-type controllable direct-current current source ice-melting circuit and apparatus |
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