CN101431224A - De-icing technology for overhead transmission line - Google Patents
De-icing technology for overhead transmission line Download PDFInfo
- Publication number
- CN101431224A CN101431224A CNA2008102368188A CN200810236818A CN101431224A CN 101431224 A CN101431224 A CN 101431224A CN A2008102368188 A CNA2008102368188 A CN A2008102368188A CN 200810236818 A CN200810236818 A CN 200810236818A CN 101431224 A CN101431224 A CN 101431224A
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- ice
- icing
- melt
- transmission line
- overhead transmission
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Abstract
The invention relates to an AC/DC overhead transmission line ice-melting technology which adopts split-phase conductors. When a line needs ice-melting, the load current which is evenly distributed in every split-phase conductor under normal conditions is transferred to one or more split-phase conductors; and when the centralized single conductor has the load current to a certain extent, the ice on the conductor can be melted. The deicing purpose can be realized by adopting the alternate switching manner by melting the ice on other split-phase conductors in sequence. If the manner is adopted before the line is iced, the purpose of line-icing prevention can be achieved.
Description
Affiliated technical field
The present invention relates to a kind of de-icing technology for overhead transmission line, be applicable to the alternating current-direct current overhead transmission line ice-melt of adopting bundle conductor.
Background technology
Overhead transmission line icing in the winter time is one of natural calamity of electric power system.Owing to increased ice load on the lead, all can bring certain mechanical failure to lead, iron tower and gold utensil, can cause rupture of line, shaft tower to cover when icing is serious, cause large area blackout.Because accident occurs in severe winter, heavy snow has sealed the mountain passes, or highway freezes, and makes the repairing condition very difficult, causes long-time power failure, and national economy is caused heavy losses.
Present both at home and abroad de-icing technology for overhead transmission line mainly can be divided into three kinds of mechanical deicing's methods, the anti-icing method of coating, thermal ice-melting method.
Mechanical deicing's method is that a kind of mechanical external force that uses makes the de-icing method that icing comes off on the lead.
The anti-icing method of coating is a kind ofly to coat certain coating in conductive line surfaces, reducing rainwater or the adhesive force of snow on lead, thus the method that stops conductive line surfaces to be frozen.
The thermal ice-melting method is the method that a kind of Joule heat that utilizes electric current to produce in lead melts wire icing.Difference according to power supply can be divided into short-circuit method, DC ice melting method, trend transfer method etc. again.Short-circuit method needs circuit to stop transport, and with single-phase, two-phase or three-phase conducting wire short circuit, utilizes the short circuit current heating wires to reach molten ice purpose.The DC ice melting method needs circuit to stop transport, and an end passes to direct current, and other end short circuit is realized the ice-melt purpose.The load transfer method to certain bar circuit, raises the load current of this circuit the load transfer of other circuit, reaches the purpose of ice-melt.
The present invention is primarily aimed at the alternating current-direct current overhead transmission line that adopts bundle conductor, can its conductor temperature be raise at the part of path that needs ice-melt and melt wire icing, and do not influencing the normal power delivery of circuit, do not having a power failure, do not changing under the condition of trend, solve the ice-melt problem of transmission line, have positive meaning alleviating the infringement that ice damage brings to electrical network.
Summary of the invention
The present invention relates to a kind of de-icing technology for overhead transmission line, be applicable to the ice-melt of the alternating current-direct current overhead transmission line that adopts bundle conductor.When circuit needs ice-melt, the load current that is evenly distributed under the normal condition in each phase bundle conductor is concentrated one or a few bundle conductor of transferring to wherein, when the solid conductor load current size after concentrating acquires a certain degree, can melt the icing of this bundle conductor.Adopt the mode of switching in turn then, melt the icing on all the other bundle conductors successively, reach the purpose of deicing.If before circuit freezes, adopt this mode, also can reach the anti-icing purpose of circuit.
When utilizing the present invention, can its conductor temperature be raise at the part of path that needs ice-melt and melt wire icing, do not change the normal operation of non-icing part of path, not influence the normal power delivery of circuit, need not to have a power failure, need not trend and shift line ice-melting.The icing of three-phase conducting wire melts simultaneously, can avoid shaft tower to bear uneven bias force.The present invention also can cooperate other thermal ice-melting mode, reduces the power demand under other ice-melting mode.
A kind of de-icing technology for overhead transmission line is characterized in that: be applicable to the ice-melt of the alternating current-direct current overhead transmission line that adopts bundle conductor.When circuit needs ice-melt, the load current that is evenly distributed under the normal condition in each phase bundle conductor is concentrated one or a few bundle conductor of transferring to wherein, when the solid conductor load current size after concentrating acquires a certain degree, can melt the icing of this bundle conductor.Adopt the mode of switching in turn then, melt the icing on all the other bundle conductors successively, reach the purpose of deicing.If before circuit freezes, adopt this mode, also can reach the anti-icing purpose of circuit.
At above-mentioned de-icing technology for overhead transmission line, when circuit needs ice-melt, can its conductor temperature be raise at the part of path that needs ice-melt and melt wire icing, do not change the normal operation of non-icing part of path, do not influence the normal power delivery of circuit, need not to have a power failure, need not trend and shift.
At above-mentioned de-icing technology for overhead transmission line, when circuit needed ice-melt, the icing of three-phase conducting wire melted simultaneously, avoided shaft tower to bear uneven bias force.
At above-mentioned de-icing technology for overhead transmission line, can cooperate other thermal ice-melting mode, reduce the power demand under other ice-melting mode.
At above-mentioned de-icing technology for overhead transmission line, zone one end that needs ice-melt at circuit, series connection inserts switching device respectively in each phase conductor, the real-time detection line load current of this switching device size, according to the ice melting current control strategy that embeds, automatically control the break-make of each bundle conductor, and realize the switching between the bundle conductor automatically.
At above-mentioned de-icing technology for overhead transmission line, bundle conductor yoke plate wire clamp and conductor spacer to the part of path that needs ice-melt are transformed, make them between every phase bundle conductor, form certain resistance, the value of this resistance both can realize the current transfer between the bundle conductor, suppress superpotential generation, can satisfy the requirement that equipotential connects between the bundle conductor when the non-ice-melt phase, circuit normally moved again.
At above-mentioned de-icing technology for overhead transmission line, switching device is responded to power taking from line load, and to battery charge, this battery is as the power supply of switching device by charging circuit.
At above-mentioned de-icing technology for overhead transmission line, switching device and master-control room are set up telecommunication, accept the teleinstruction of master-control room and realize start-stop, and transmit the running state information of switching device to master-control room.
At above-mentioned de-icing technology for overhead transmission line, during switching device series connection line attachment, hang on the lead connecting plate below of strain tower, two ends are respectively the bundle conductor splicing ear, and when withdrawing from circuit, line connection can return to connection status at ordinary times.
The present invention comprises a kind of switching device, and this switching device is installed on circuit zone one end that needs ice-melt, hangs on the lead connecting plate below of this end strain tower, and series connection inserts in each phase conductor.Its real-time detection line load current size according to the ice melting current control strategy of its embedding, is controlled the break-make of each bundle conductor automatically, and realizes the switching between the bundle conductor automatically.It responds to power taking from line load, to battery charge, this battery is as the power supply of switching device by charging circuit.It and master-control room are set up telecommunication, accept the teleinstruction of master-control room and realize start-stop, and transmit the running state information of switching device to master-control room.When it withdrawed from circuit, line connection can return to connection status at ordinary times.
The present invention comprises a kind of novel bundle conductor yoke plate wire clamp and conductor spacer, they form certain resistance between every phase bundle conductor, this resistance value both can realize the current transfer between the bundle conductor, suppress superpotential generation, can satisfy the requirement that equipotential connects between the bundle conductor when the non-ice-melt phase, circuit normally moved again.
Description of drawings
Fig. 1 is that the switching device series connection inserts scheme of installation
Fig. 2 is a circuit phase bundle conductor current transfer schematic diagram
Fig. 3 is the switching device schematic diagram
Fig. 4 is the induction coil schematic diagram
Fig. 5 is that schematic diagram is looked on the left side of Fig. 4
Embodiment
Below in conjunction with accompanying drawing 1, Fig. 2, Fig. 3, Fig. 4, the present invention is described in further detail.
Referring to Fig. 1, the switching device among the present invention is installed on the strain tower between DC ice-melting and the non-DC ice-melting, hangs on the connecting plate below of every phase conductor, and wire jumper is disconnected, and series connection inserts switching device.
Referring to Fig. 2, the ice-melt operation principle among the present invention is: CT and induction coil are installed on non-ice-melt side lead, and CT is used for the load current size of detection line, and induction coil is used for getting energy from line load.Switching device is according to detecting load current size that obtains and the ice melting current control strategy that embeds, the break-make of control switch group A1, A2, A3, A4 in real time.As the A1 closure, A2, A3, A4 disconnect, and then melt bundle conductor A1; As A1, A2 closure, A3, A4 disconnect, and then melt bundle conductor A1 and A2, so analogize.Switches set A1, A2, A3, A4 take turns break-make according to the ice melting current control strategy, melt the icing on all the other bundle conductors.Bus in parallel is installed on non-ice-melt side lead.Lead connecting plate gold utensil and conductor spacer on the ice-melt side lead are transformed, they form certain resistance between every phase bundle conductor, this resistance value both can realize the current transfer between the bundle conductor, suppress superpotential generation, can satisfy the requirement that equipotential connects between the bundle conductor when the non-ice-melt phase, circuit normally moved again.
Referring to Fig. 2, the operation principle of the switching device among the present invention is: the line influence coil is installed on the lead, and induced voltage offers charge circuit, and charge circuit charges the battery.Battery is as the power supply of on-off controller, switches set and telecommunication.Line current instrument transformer detection load electric current, input to on-off controller, embedding in the on-off controller has ice-melt control strategy, the make-break operation of control switch group, telecommunication is responsible for receiving the instruction of master control and is passed to on-off controller, and sends the operating state of switches set to master-control room.
Referring to Fig. 4 and Fig. 5, the induction coil among the present invention mainly comprises: iron core 1.; The rogowski coil 2.; Securing member 3.; Lead 4..4. go up at transmission line wire, 1. with 3. make-up of securing member, the interface of iron core is smooth with the iron core of two annulars, and the magnetic field that produces for the electric current of lead in 4. provides magnetic resistance as far as possible little magnetic loop, to increase interlinkage coil magnetic flux 2..2. coil is wound on iron core and 1. goes up, and the electric current on the lead induces voltage at coil on 2. by alternating magnetic field, as the power supply 2. of the charge circuit among Fig. 3.
Claims (9)
1. a de-icing technology for overhead transmission line is characterized in that: be applicable to the ice-melt of the alternating current-direct current overhead transmission line that adopts bundle conductor.When circuit needs ice-melt, the load current that is evenly distributed under the normal condition in each phase bundle conductor is concentrated one or a few bundle conductor of transferring to wherein, when the solid conductor load current size after concentrating acquires a certain degree, can melt the icing of this bundle conductor.Adopt the mode of switching in turn then, melt the icing on all the other bundle conductors successively, reach the purpose of deicing.If before circuit freezes, adopt this mode, also can reach the anti-icing purpose of circuit.
2. de-icing technology for overhead transmission line according to claim 1, it is characterized in that: when circuit needs ice-melt, can its conductor temperature be raise at the part of path that needs ice-melt and melt wire icing, do not change the normal operation of non-icing part of path, do not influence the normal power delivery of circuit, need not to have a power failure, need not trend and shift.
3. de-icing technology for overhead transmission line according to claim 1 is characterized in that: when circuit needed ice-melt, the icing of three-phase conducting wire melted simultaneously, avoided shaft tower to bear uneven bias force.
4. de-icing technology for overhead transmission line according to claim 1 is characterized in that: can cooperate other thermal ice-melting mode, reduce the power demand under other ice-melting mode.
5. de-icing technology for overhead transmission line according to claim 1, it is characterized in that: zone one end that needs ice-melt at circuit, series connection inserts switching device respectively in each phase conductor, the real-time detection line load current of this switching device size, according to the ice melting current control strategy that embeds, automatically control the break-make of each bundle conductor, and realize the switching between the bundle conductor automatically.
6. de-icing technology for overhead transmission line according to claim 1, it is characterized in that: bundle conductor yoke plate wire clamp and conductor spacer to the part of path that needs ice-melt are transformed, make them between every phase bundle conductor, form certain resistance, the value of this resistance both can realize the current transfer between the bundle conductor, suppress superpotential generation, can satisfy the requirement that equipotential connects between the bundle conductor when the non-ice-melt phase, circuit normally moved again.
7. de-icing technology for overhead transmission line according to claim 2 is characterized in that: switching device is responded to power taking from line load, and to battery charge, this battery is as the power supply of switching device by charging circuit.
8. de-icing technology for overhead transmission line according to claim 2 is characterized in that: switching device and master-control room are set up telecommunication, accept the teleinstruction of master-control room and realize start-stop, and transmit the running state information of switching device to master-control room.
9. de-icing technology for overhead transmission line according to claim 2, it is characterized in that: during switching device series connection line attachment, hang on the lead connecting plate below of strain tower, two ends are respectively the bundle conductor splicing ear, when withdrawing from circuit, line connection can return to connection status at ordinary times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102368188A CN101431224A (en) | 2008-12-12 | 2008-12-12 | De-icing technology for overhead transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102368188A CN101431224A (en) | 2008-12-12 | 2008-12-12 | De-icing technology for overhead transmission line |
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| CN101431224A true CN101431224A (en) | 2009-05-13 |
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| CNA2008102368188A Pending CN101431224A (en) | 2008-12-12 | 2008-12-12 | De-icing technology for overhead transmission line |
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Cited By (24)
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| CN103022947A (en) * | 2012-11-28 | 2013-04-03 | 西昌市世通配件加工厂 | Automatic temperature-rising power transmission line system |
| CN103050920A (en) * | 2013-02-16 | 2013-04-17 | 湖南省电力公司科学研究院 | Intelligent device for circularly melting ice on power transmission line with eight split sub-conductors by current |
| CN103050923A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with eight split sub-conductors by current |
| CN103050919A (en) * | 2013-02-16 | 2013-04-17 | 湖南省电力公司科学研究院 | Intelligent device for circularly melting ice on power transmission line with ten split sub-conductors by current |
| CN103050922A (en) * | 2013-02-16 | 2013-04-17 | 重庆广仁铁塔制造有限公司 | Intelligent device for circularly melting ice on power transmission line with eleven split sub-conductors by current |
| CN103050918A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with four split sub-conductors by current |
| CN103050917A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with twelve split sub-conductors by current |
| CN103050921A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with six split sub-conductors by current |
| CN103066543A (en) * | 2013-02-16 | 2013-04-24 | 湖南省电力公司科学研究院 | Current circulating smart ice melting device of three-bundle-conductor electric transmission line |
| CN103078285A (en) * | 2013-02-16 | 2013-05-01 | 重庆广仁铁塔制造有限公司 | Nine-bundle conductor transmission line current circulation intelligent ice-melting device |
| CN103094869A (en) * | 2013-02-16 | 2013-05-08 | 重庆广仁铁塔制造有限公司 | Electric transmission line current circulation intelligent ice melting device of five divided conductors |
| CN103326300A (en) * | 2013-06-18 | 2013-09-25 | 国家电网公司 | Power-failure-free direct-current deicing device |
| CN103490364A (en) * | 2013-09-27 | 2014-01-01 | 中海阳能源集团股份有限公司 | DCS control power grid power transmission line ice-preventing device |
| CN104577927A (en) * | 2015-01-21 | 2015-04-29 | 武汉大学 | Self-adaption composite heating power ice melting cooperating method |
| CN107302204A (en) * | 2017-02-22 | 2017-10-27 | 中国能源建设集团南京线路器材有限公司 | Upper box-like electricity getting device |
| CN109586232A (en) * | 2019-01-31 | 2019-04-05 | 西京学院 | The UAV system and its application method of high-voltage and ultra-high overhead transmission line deicing |
| CN113471769A (en) * | 2021-07-07 | 2021-10-01 | 贵州电网有限责任公司 | Current circulation ice-melting junction station for split conductor |
| CN113517667A (en) * | 2021-07-14 | 2021-10-19 | 四川大学 | Nondestructive single-phase anti-icing and de-icing control equipment based on insulated gate bipolar transistor |
| CN113541081A (en) * | 2021-07-14 | 2021-10-22 | 四川大学 | Lossless single-phase anti-icing and de-icing control equipment based on thyristor |
| CN113889957A (en) * | 2021-09-26 | 2022-01-04 | 武汉理工大学 | Non-contact coupling type ice melting topology based on distributed power flow control and ice melting method |
| CN115360665A (en) * | 2022-08-09 | 2022-11-18 | 国网四川省电力公司内江供电公司 | Ice melting device and method for load section of power distribution network power transmission line |
| CN116564581A (en) * | 2023-07-10 | 2023-08-08 | 江东金具设备有限公司 | Conductive component of ground wire ice melting device and ground wire ice melting device |
| CN117239933A (en) * | 2023-11-09 | 2023-12-15 | 国网辽宁省电力有限公司 | Power network transmission line detection device and system thereof |
| WO2024093069A1 (en) * | 2022-10-31 | 2024-05-10 | 李荷泉 | Line bundle conductor anti-icing and deicing device, sub-conductor spacer, and system |
-
2008
- 2008-12-12 CN CNA2008102368188A patent/CN101431224A/en active Pending
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| CN103022947A (en) * | 2012-11-28 | 2013-04-03 | 西昌市世通配件加工厂 | Automatic temperature-rising power transmission line system |
| CN103022947B (en) * | 2012-11-28 | 2016-03-02 | 西昌市世通配件加工厂 | A kind of automatic heating line system |
| CN103050922B (en) * | 2013-02-16 | 2015-04-29 | 重庆广仁铁塔制造有限公司 | Intelligent device for circularly melting ice on power transmission line with eleven split sub-conductors by current |
| CN103078285A (en) * | 2013-02-16 | 2013-05-01 | 重庆广仁铁塔制造有限公司 | Nine-bundle conductor transmission line current circulation intelligent ice-melting device |
| CN103050922A (en) * | 2013-02-16 | 2013-04-17 | 重庆广仁铁塔制造有限公司 | Intelligent device for circularly melting ice on power transmission line with eleven split sub-conductors by current |
| CN103050920B (en) * | 2013-02-16 | 2015-09-02 | 湖南省电力公司科学研究院 | Binary fission wire transmission line current cycle intelligence deicing device |
| CN103050917A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with twelve split sub-conductors by current |
| CN103050920A (en) * | 2013-02-16 | 2013-04-17 | 湖南省电力公司科学研究院 | Intelligent device for circularly melting ice on power transmission line with eight split sub-conductors by current |
| CN103066543A (en) * | 2013-02-16 | 2013-04-24 | 湖南省电力公司科学研究院 | Current circulating smart ice melting device of three-bundle-conductor electric transmission line |
| CN103050921A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with six split sub-conductors by current |
| CN103094869A (en) * | 2013-02-16 | 2013-05-08 | 重庆广仁铁塔制造有限公司 | Electric transmission line current circulation intelligent ice melting device of five divided conductors |
| CN103050919A (en) * | 2013-02-16 | 2013-04-17 | 湖南省电力公司科学研究院 | Intelligent device for circularly melting ice on power transmission line with ten split sub-conductors by current |
| CN103050918A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with four split sub-conductors by current |
| CN103078285B (en) * | 2013-02-16 | 2015-04-08 | 重庆广仁铁塔制造有限公司 | Nine-bundle conductor transmission line current circulation intelligent ice-melting device |
| CN103050919B (en) * | 2013-02-16 | 2015-04-08 | 湖南省电力公司科学研究院 | Intelligent device for circularly melting ice on power transmission line with ten split sub-conductors by current |
| CN103050923B (en) * | 2013-02-16 | 2015-04-08 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with eight split sub-conductors by current |
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| CN103050918B (en) * | 2013-02-16 | 2015-04-08 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with four split sub-conductors by current |
| CN103094869B (en) * | 2013-02-16 | 2015-04-29 | 重庆广仁铁塔制造有限公司 | Electric transmission line current circulation intelligent ice melting device of five divided conductors |
| CN103050917B (en) * | 2013-02-16 | 2015-04-29 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with twelve split sub-conductors by current |
| CN103050923A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with eight split sub-conductors by current |
| CN103326300A (en) * | 2013-06-18 | 2013-09-25 | 国家电网公司 | Power-failure-free direct-current deicing device |
| CN103326300B (en) * | 2013-06-18 | 2016-03-02 | 国家电网公司 | One does not have a power failure DC de-icing device |
| CN103490364B (en) * | 2013-09-27 | 2016-08-17 | 中海阳能源集团股份有限公司 | DCS controls power grid transmission line ice-proof device |
| CN103490364A (en) * | 2013-09-27 | 2014-01-01 | 中海阳能源集团股份有限公司 | DCS control power grid power transmission line ice-preventing device |
| CN104577927B (en) * | 2015-01-21 | 2017-01-25 | 武汉大学 | Self-adaption composite heating power ice melting cooperating method |
| CN104577927A (en) * | 2015-01-21 | 2015-04-29 | 武汉大学 | Self-adaption composite heating power ice melting cooperating method |
| CN107302204B (en) * | 2017-02-22 | 2022-10-14 | 中国能源建设集团南京线路器材有限公司 | Upper combined electricity taking device |
| CN107302204A (en) * | 2017-02-22 | 2017-10-27 | 中国能源建设集团南京线路器材有限公司 | Upper box-like electricity getting device |
| CN109586232A (en) * | 2019-01-31 | 2019-04-05 | 西京学院 | The UAV system and its application method of high-voltage and ultra-high overhead transmission line deicing |
| CN109586232B (en) * | 2019-01-31 | 2020-03-24 | 西京学院 | Unmanned aerial vehicle system for deicing high-voltage and ultrahigh-voltage overhead transmission line and use method thereof |
| CN113471769A (en) * | 2021-07-07 | 2021-10-01 | 贵州电网有限责任公司 | Current circulation ice-melting junction station for split conductor |
| CN113471769B (en) * | 2021-07-07 | 2024-04-02 | 贵州电网有限责任公司 | Split conductor current circulation ice melting combiner |
| CN113541081A (en) * | 2021-07-14 | 2021-10-22 | 四川大学 | Lossless single-phase anti-icing and de-icing control equipment based on thyristor |
| CN113517667A (en) * | 2021-07-14 | 2021-10-19 | 四川大学 | Nondestructive single-phase anti-icing and de-icing control equipment based on insulated gate bipolar transistor |
| CN113889957A (en) * | 2021-09-26 | 2022-01-04 | 武汉理工大学 | Non-contact coupling type ice melting topology based on distributed power flow control and ice melting method |
| CN115360665A (en) * | 2022-08-09 | 2022-11-18 | 国网四川省电力公司内江供电公司 | Ice melting device and method for load section of power distribution network power transmission line |
| CN115360665B (en) * | 2022-08-09 | 2024-02-23 | 国网四川省电力公司内江供电公司 | Ice melting device and method for load section of power transmission line of power distribution network |
| WO2024093069A1 (en) * | 2022-10-31 | 2024-05-10 | 李荷泉 | Line bundle conductor anti-icing and deicing device, sub-conductor spacer, and system |
| CN116564581B (en) * | 2023-07-10 | 2023-11-03 | 江东金具设备有限公司 | Conductive component of ground wire ice melting device and ground wire ice melting device |
| CN116564581A (en) * | 2023-07-10 | 2023-08-08 | 江东金具设备有限公司 | Conductive component of ground wire ice melting device and ground wire ice melting device |
| CN117239933B (en) * | 2023-11-09 | 2024-02-09 | 国网辽宁省电力有限公司 | Power network transmission line detection device and system thereof |
| CN117239933A (en) * | 2023-11-09 | 2023-12-15 | 国网辽宁省电力有限公司 | Power network transmission line detection device and system thereof |
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Open date: 20090513 |