CN102255273B - Efficient direct current ice melting method - Google Patents
Efficient direct current ice melting method Download PDFInfo
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- CN102255273B CN102255273B CN 201110221088 CN201110221088A CN102255273B CN 102255273 B CN102255273 B CN 102255273B CN 201110221088 CN201110221088 CN 201110221088 CN 201110221088 A CN201110221088 A CN 201110221088A CN 102255273 B CN102255273 B CN 102255273B
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- ice melting
- melting
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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 direct current ice melting method, belongs to the innovative technology that the power transmission network power line DC ice-melting is used.
Background technology
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, 2009, Guizhou Power Grid company executes II line, 220 kilovolts of old lines of good fortune, 110 kilovolts of water tree plum lines of 110 kilovolts of good fortune ox lines to 500 kilovolts of good fortune and has carried out DC ice melting, Yunnan Power Grid Company has carried out DC ice melting to 220 kilovolts of clear large 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 again, the 19 cover DC de-icing devices of having installed in south electric network have all been brought into play significant role, the 110kV Above Transmission Lines is carried out DC ice melting to be amounted to 227 times, wherein 500kV alternating current circuit more than 40 bars are inferior, given full play to the power of DC de-icing device.
The icing overload causes transmission line tripping operation and device damage, naturally deicing the wire jump that causes and waving of dependence weather also will cause transmission line tripping operation and device damage, and untimely ice-melt also may cause wire to jump and wave causing that also transmission facility damages.Simultaneously in the icing process, when wire certain icing after, center of gravity can be offset, further accumulated ice is convenient on each side in the torsion that wire occurs, and accelerates icing and increases, ice-melt timely is the important means that delays wire icing.According to heavy ice phase in 2008 statistics, line ice coating daily thickens approximately 5mm, is no more than 10mm as need control circuit icing, just need to complete an ice-melt to circuit in every 2 days.The practical application of DC de-icing device in 2011 has proved that also in time ice-melt efficiently 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 direct current ice melting method.
technical scheme of the present invention is: direct current ice melting method of the present invention, described direct current ice melting method DC de-icing device used includes converter, the DC side disconnecting link, 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, the first disconnecting link S1 of DC side disconnecting link converter side is connected with the negative pole of converter after disconnecting link S2 parallel connection with being connected, be connected with the positive pole of converter after the 3rd disconnecting link S3 and 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 direct current ice melting method comprises the steps:
Start this line direct-current ice-melting flow process when 1) line ice coating thickness surpasses warning value;
2) will access DC de-icing device by the DC side disconnecting link after A, the series connection of B phase conductor, the first disconnecting link S1 and the 3rd disconnecting link S3 is closed, the second disconnecting link S2 and four blade lock S4 disconnect, and namely A, B phase conductor are by the first disconnecting link S1 in the DC side disconnecting link and the rear access of the 3rd disconnecting link S3 series connection DC de-icing device;
3) close circuit breaker QF after closed isolation switch K sends unlock command release DC de-icing device controlling on protection system, with the speed of 300-600A/s, direct current is risen to this wire design ice melting current, waits the circuit coating ice falling; After line ice coating comes off, send the locking order controlling protection system, the DC de-icing device output current is down to locking after minimum permissible value according to setting speed 300-600A/s;
4) carry out minute closing operation of DC side disconnecting link after the DC de-icing device locking, closed the second disconnecting link S2 and four blade lock S4, keep the first disconnecting link S1 closed, disconnect the 3rd disconnecting link S3, with after completing two phase conductor A of ice-melt and B and being in parallel with the 3rd wire C rear access DC de-icing device that is in series;
5) release DC de-icing device again, and promote DC de-icing device with the speed of 300-600A/s and output current to this line design ice melting current, the 3rd wire C phase coating ice falling waited; After line ice coating comes off, send the locking order controlling protection system, the DC de-icing device output current is down to locking after minimum permissible value according to setting speed 300-600A/s, completes the three-phase line ice-melt;
6) open DC de-icing device AC circuit breaker Q F, isolation switch K and DC side disconnecting link, recover to have completed the operation of DC ice-melting.
In said process, AC circuit breaker Q F, isolation switch K remain closed.
Above-mentioned is 0.4-0.6 over icing ratio warning value.
DC de-icing device of the present invention comprises the structure of converter, control protection equipment, DC side disconnecting link due to employing; direct current ice melting method of the present invention is just to begin to carry out DC ice melting when the circuit ice covering thickness not yet surpasses design load; the first step with the series connection of two wires after the access DC de-icing devices complete two phase conductor ice-melts, access DC de-icing device after second step will be completed and connect with the 3rd wire after ice-melt two phase conductor parallel connections and complete the 3rd wire ice-melt.By controlling the operation of DC side disconnecting link, do not need to disconnect AC 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 fast and safely ice-melt of three-phase line, has greatly improved security of system and reliability; Reduce simultaneously the grid switching operation of switch tool and the work of ice-melt field connection.Direct current 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 line ice coating, the consumption electric energy is minimum, avoids icing to surpass the convenient and practical direct current ice melting method that design load, DC ice melting or the process that naturally deices cause that equipment damages.
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 as shown in Figure 1.I.e. this line outage after powerline ice-covering ratio reaches 0.4-0.6, three-phase line three-phase end short circuit, head end access DC de-icing device.
The first disconnecting link S1 and the 3rd disconnecting link S3 in DC side disconnecting link 2 in Fig. 1 that close, the second disconnecting link S2 and four blade lock S4 disconnect, and the QF that closes a switch after the isolation switch K that closes namely forms the ice-melt loop by A phase, B phase conductor and deicing device.The release DC de-icing device rises to this wire design ice melting current with 300-600A/s speed with direct current, waits A phase, B phase conductor coating ice falling; After A phase, B phase conductor coating ice falling, send the locking order in control system, the DC de-icing device output current is down to locking after minimum permissible value according to setting speed 300-600A/s.
Carry out minute closing operation of DC side disconnecting link after the DC de-icing device locking, will disconnect the 3rd disconnecting link S3 after the second disconnecting link S2 and four blade lock S4 closure, soon having completed connect with the C phase conductor after ice-melt A phase, the parallel connection of B phase conductor accesses DC de-icing device afterwards.
Release DC de-icing device again, and promote DC de-icing device with 300-600A/s speed and output current to this line design ice melting current, C phase conductor coating ice falling waited; After C phase conductor coating ice falling, send the locking order in control system, the DC de-icing device output current is down to locking after minimum permissible value according to setting speed 300-600A/s.
Separately separate isolation switch K after AC circuit breaker Q F, then separate DC side the first disconnecting link S1, the second disconnecting link S2 and four blade lock S4, recover at last to have completed the DC ice-melting operation.
Embodiment 2:
The connection diagram of 6 pulsating direct current deicing devices and DC ice-melting as shown in Figure 2.
I.e. this line outage after powerline ice-covering ratio reaches 0.4-0.6, three-phase line three-phase end short circuit, head end access DC de-icing device.
Close in Fig. 1 DC side the first disconnecting link S1 and the 3rd disconnecting link S3 is closed, and the second disconnecting link S2 and four blade lock S4 disconnect, and the circuit breaker Q F that closes after the AC isolation switch K that closes namely forms the ice-melt loop by A phase, B phase conductor and deicing device.The release DC de-icing device rises to this wire design ice melting current with 300-600A/s speed with direct current, waits A phase, B phase conductor coating ice falling; After A phase, B phase conductor coating ice falling, send the locking order in control system, the DC de-icing device output current is down to locking after minimum permissible value according to setting speed 300-600A/s.
Carry out minute closing operation of DC side disconnecting link after the DC de-icing device locking, will disconnect the 3rd disconnecting link S3 after the second disconnecting link S2 and four blade lock S4 closure, soon having completed connect with the C phase conductor after ice-melt A phase, the parallel connection of B phase conductor accesses DC de-icing device afterwards.
Release DC de-icing device again, and promote DC de-icing device with 300-600A/s speed and output current to this line design ice melting current, C phase conductor coating ice falling waited; After C phase conductor coating ice falling, send the locking order in control system, the DC de-icing device output current is down to locking after minimum permissible value according to setting speed 300-600A/s.
Separately separate the K isolation switch after AC circuit breaker Q F, then separate direct current the first disconnecting link S1, the second disconnecting link S2 and four blade lock S4, recover at last to have completed the DC ice-melting operation.
Claims (3)
1. direct current ice melting method, described direct current ice melting method DC de-icing device used 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, the first disconnecting link S1 of DC side disconnecting link (2) converter side is connected with the negative pole of converter (1) after disconnecting link S2 parallel connection with being connected, be connected with the positive pole of converter (1) after the 3rd disconnecting link S3 and 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 direct current ice melting method comprises the steps:
Start this line direct-current ice-melting flow process when 1) line ice coating thickness surpasses warning value;
2) will access DC de-icing device by DC side disconnecting link (2) after A, the series connection of B phase conductor, the first disconnecting link S1 and the 3rd disconnecting link S3 is closed, the second disconnecting link S2 and four blade lock S4 disconnect, and namely A, B phase conductor are by the first disconnecting link S1 in DC side disconnecting link (2) and the rear access of the 3rd disconnecting link S3 series connection DC de-icing device;
3) close circuit breaker QF after closed isolation switch K sends unlock command release DC de-icing device controlling on protection system (3), with the speed of 300-600A/s, direct current is risen to this wire design ice melting current, waits the circuit coating ice falling; After line ice coating comes off, send the locking order controlling protection system, the DC de-icing device output current is down to locking after minimum permissible value according to setting speed 300-600A/s;
4) carry out minute closing operation of DC side disconnecting link (2) after the DC de-icing device locking, closed the second disconnecting link S2 and four blade lock S4, keep the first disconnecting link S1 closed, disconnect the 3rd disconnecting link S3, with after completing two phase conductor A of ice-melt and B and being in parallel with the 3rd wire C rear access DC de-icing device that is in series;
5) release DC de-icing device again, and promote DC de-icing device with the speed of 300-600A/s and output current to this line design ice melting current, the 3rd wire C phase coating ice falling waited; After line ice coating comes off, send the locking order controlling protection system, the DC de-icing device output current is down to locking after minimum permissible value according to setting speed 300-600A/s, completes the three-phase line ice-melt;
6) open DC de-icing device AC circuit breaker Q F, isolation switch K and DC side disconnecting link, recover to have completed the operation of DC ice-melting.
2. direct current ice melting method according to claim 1, is characterized in that in said process, AC circuit breaker Q F, isolation switch K remain closed.
3. direct current ice melting method according to claim 1, is characterized in that above-mentioned is 0.4-0.6 over icing ratio warning value.
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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 true CN102255273B (en) | 2013-06-12 |
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| CN102290773B (en) * | 2011-08-25 | 2013-12-25 | 中国电力工程顾问集团西南电力设计院 | Wiring method for realizing full-automatic line direct-current ice-melting operation |
| 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 |
| CN102841286B (en) * | 2012-08-07 | 2015-05-06 | 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 |
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| US4082962A (en) * | 1977-07-11 | 1978-04-04 | Burgsdorf Vladimir Vladimirovi | Device for melting the icing by direct current on conductors of overhead power transmission line |
| CN101316033A (en) * | 2008-06-11 | 2008-12-03 | 国网武汉高压研究院 | High-capacity direct current de-icing device |
| CN201332248Y (en) * | 2008-12-31 | 2009-10-21 | 许继集团有限公司 | DC ice melting switching device |
| CN101882774B (en) * | 2010-03-30 | 2012-09-26 | 南方电网科学研究院有限责任公司 | DC de-icing device without special rectifier transformer and protection method thereof |
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