CN101667722B - Method for melting ice and snow on power transmission and distribution lines by low voltage and high current - Google Patents
Method for melting ice and snow on power transmission and distribution lines by low voltage and high current Download PDFInfo
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- CN101667722B CN101667722B CN2008102143790A CN200810214379A CN101667722B CN 101667722 B CN101667722 B CN 101667722B CN 2008102143790 A CN2008102143790 A CN 2008102143790A CN 200810214379 A CN200810214379 A CN 200810214379A CN 101667722 B CN101667722 B CN 101667722B
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Abstract
The invention discloses a method for melting ice and snow on power transmission and distribution lines by low voltage and high current. The method adopts the power transmission and distribution lines needed to melt the ice and snow and transformer substations at two ends of a power transmission line; at the two ends of the power transmission line, namely inlet and outlet lines of the transformer substations, one end of the power transmission line is connected with the low voltage of 12 to 80 volts, and the other end of the power transmission line is connected with a short-circuit operating station. When the ice and snow need to be melted, a low voltage output operation is carried out at one end connected with the low voltage, and a short-circuit operation is carried out at one end connected with the short-circuit operating station so as to achieve the low voltage and the high current on the power transmission and distribution lines needed to melt the ice and snow to generate heat so that the ice and snow needed to be melted on the power transmission and distribution lines acquire the heat to be melted. The method for removing the ice and snow on the power transmission line saves manpower, avoids climbing a pole tower, and is quite convenient, quick and safe when the ice and snow on any line are melted at the ice and snow weather. Particularly in winter, the method can designedly remove the ice and snow on each line, and does not influence industrial and agricultural production and daily life power consumption of people.
Description
Technical field
The present invention relates to the guard method on the defeated modified line road of electric power, particularly a kind of method with the low voltage and high current melting ice and snow on power transmission and distribution lines.
Background technology
14 provinces of in February, 2008 China suffer that the harm of ice and snow makes the electrical network broken string of falling the shaft tower, electrical network has a power failure comprehensively and makes national economy suffer heavy losses never before seen, Guizhou ice and snow not seen once in a hundred years especially congeals, make Duyun City and high-and low-voltage circuit, the whole Bouyei-Miao Autonomous Prefecture of Qiannan broken string of falling the shaft tower even more serious, caused Quanzhou to have a power failure not having a circuit is the intact not broken string of falling the shaft tower.How eliminating the ice and snow that coagulates that overlays on the lead, is China and countries in the world problem anxious to be solved in winter.
The power supply administration of northern China electrical network, the past, the Chinese Central Television (CCTV) reported with the ice and snow on the method removal lead of low-voltage short circuit, reported also that Russia also used low-voltage short circuit deicing, what they adopted is that 220 volts, 380 volts voltages are removed the ice and snow on the lead.220, can produce blast during 380 volts of high voltage short circuit deicing, and their short-circuit voltage electric current increases severely fast, have loosening point will emit arc light on short circuit place switch and lead contact point and the lead, stronger than the arc light of common electric welding.The loosening point of switch is lived in the weldering of high temperature arc light will blow lead, so the short circuit deicing of China does not continue development.
Summary of the invention
The objective of the invention is provides both safety for the deficiency that solves above-mentioned technology, can not damage electric line, again need not rod-rising tower, economize people's a kind of method in labour-saving again with the low voltage and high current melting ice and snow on power transmission and distribution lines.
In order to achieve the above object, a kind of method provided by the invention with the low voltage and high current melting ice and snow on power transmission and distribution lines, it comprises that employing need melt the electric line of ice and snow and the transformer station at transmission line two ends, two ends at transmission line, be on the turnover line of transformer station, the one end connects 12 volts to 80 volts low-voltage, and the other end connects the short circuit operating desk.When need fusing ice and snow, carry out the low tension output function at an end that connects low-voltage, carry out the short circuit operation at an end that connects the short circuit operating desk, make and realize low voltage and high current on the electric line that needs fusing ice and snow and produce heat, need the obtained heat of ice and snow of fusing on the electric line and melt thereby make.
On the turnover line of described transformer station at an end between the electric line, the low-voltage of input is to realize by the out-put supply of special transformer.Described special transformer is a three-phase low voltage and high current transformer, its input is that 10 kilovolts of high pressure are made power supply, and output voltage is two pole tensions, 80 volts of one-levels, another is 12 volts low-voltage output very, and the employing output current is 200 amperes to 300 amperes a transformer.This special transformer is used in industrial, is used for the transformer of metal smelting.It is three-phase low voltage and high current transformer.Molten ice and snow mainly is the heat that sends with high electric current, through short circuit, except that the heat of the point of impingement than much higher on the lead, the heat on the lead is consistent.The blast when operating in order to reduce short circuit and the arc light of generation, 110 kilovolts, 12 volts of voltages inputs of the used for transmission line of two-conductor line more than 220 kilovolts and 500 kilovolts reach 80 volts of voltages of short used for transmission line for 10 kilovolts and import.Select the size of transformer for use with circuit length, 220 kilovolts of two-conductor lines and 500 kilovolt adopt 300 amperes transformer.
Described short circuit operating desk comprises the carbon-point and the short circuit operating handle of contact short circuit, makes carbon-point realize the short circuit operation between the lead of required short circuit by the short circuit operating handle; The short circuit operation is to be duration of short circuit with the second, collides back and forth between each utmost point of the lead of need short circuit operation with 5 seconds to 10 seconds that are interrupted and realizes the short circuit operation.
Because during short circuit, can produce the high temperature arc light, if do contact point with metal, the high temperature of contact point can and be stained with metal molten and stick together, and can not in time separate.If the overlong time of contact also can be blown lead.For fear of the generation of this phenomenon, and make things convenient for the short circuit operation, on the short circuit operating desk, be provided with the carbon-point and the short circuit operating handle of contact short circuit, make carbon-point between the lead of required short circuit, realize short circuit by the short circuit operating handle.Adopt carbon-point as contact point (short dot), can not melt because of high temperature and be stained with and stick together.For fear of lonely light, high temperature burn operating personnel, available iron plate self-control 100
*100
*The 140cm operating desk back and forth collides short circuit with the carbon-point the operating desk to the centre from three directions by operating personnel.As long as have the people of electric power knowledge all can realize this short circuit operation, be not described in detail in this.12V voltage is safe voltage, as long as and 80V voltage is worn insulation boots, catch to touch the lead people and can not shocked by electricity.It is in order to protect operating personnel not burnt by high temperature that operating personnel wear gloves, dark glasses, and eyes are not by welding flash.
When described electric line is transmission line, overhead ground wire, the on-insulated overhead ground wire of the on-insulated overhead ground wire of transmission line and transformer station's turnover line is transformed into insulated static wire; To be transformed into on-insulated overhead ground wire and use a slice porcelain insulator, and long with 1.5m, and with the joining seam line of the same specification of overhead ground wire, its two ends connect on shaft tower ironware and the overhead ground wire and ground connection by porcelain insulator; On the terminal pole of two ends transformer station, draw to descend to the earth connection of ground with two insulated conductors with the same specification of overhead ground wire, untie before the molten ice and snow; Want line to untie joining seam line on the overhead ground wire and colligation on the shaft tower metallic support before the molten ice and snow, again the downlead in the transformer station of circuit two ends is untied; The molten ice and snow of short circuit just can be carried out the work; This moment, overhead ground wire was earth-free state, so be called insulated static wire.After removing the ice and snow on lead and the overhead ground wire, the downlead at two is recovered ground connection; The circuit ice and snow that congeals repeatedly can repeat the work of molten ice and snow.
A kind of method with the low voltage and high current melting ice and snow on power transmission and distribution lines that the present invention obtains is removed the ice and snow on the electric line, and people from province is laborsaving, need not rod-rising tower.Unify call command by on-the-spot person in overall.Send electricity by on-the-spot director commander, the order of accepting the person in overall, commander send.The short circuit operating desk of the other end is by the telephone order of another on-the-spot director according to the person in overall, and commander's short circuit is operated.Establish the special messenger in the circuit and supervise molten ice condition condition, Advise By Wire person in overall.As long as establish point of observation in the line.
In 10 KV distribution circuits, have one section be cable and the lead of insulation arranged, cable and have between the lead of insulation can not direct short-circuit, in order to avoid burn out the insulating barrier of cable and insulated conductor, the work of the molten ice and snow of short circuit will be avoided cable and insulated conductor is arranged, and at uninsulated conductor and cable, have the junction of insulated conductor to carry out; Before the molten ice and snow, distribution transforming disconnecting link switches all in the 10kV distribution line is disconnected, the high-voltage fuse in the circuit will be with the copper cash that is not less than φ 16mm; When melting ice and snow; carrying out low voltage and high current at transformer station's outlet bar send; short circuit is at distribution line terminal pole and the enterprising line operate of branch line terminal pole; time is controlled in 5 seconds to 10 seconds; also can sight path length and the ice-melt situation suitably increase and decrease the time, molten ice and snow speed is fast, the frozen water of fusing plays a part guardwire safety; in short time, can not cause the accident of blowing lead.
The used special transformer of the present invention can have been bought in China transformer producer, and the tool materials of making are simple.As long as overhead ground wire is made into insulated static wire, the overhead ground wire transformation can be carried out under charged situation, and the staff is before transforming insulated static wire, and overhead ground wire should have good earth, carries out construction safety.Ice and snow weather thinks that molten which bar circuit is very convenient, fast, safe.
Before going into the winter overhead ground wire joining seam line is untied, before the thunderstorm season joining seam line is recovered ground connection, step on the intact situation that bar is checked parts such as porcelain vase in passing.Untie and recover and under the charged situation of circuit, to untie and recover ground connection, carry out the safety requirements of live line working.Unties when the earth connection of transformer station's two terminal shaft tower has only molten ice, recover after melting ice, recover ground connection and need not rod-rising tower.
With 12 volts, 80 volts low-voltage deicing safety, quick, reliable.Just can accomplish in the winter time in a planned way each bar circuit to be carried out deicing work, can not influence industrial and agricultural production and daily life electricity consumption.The loss that ice and snow has a power failure has been educated us, and China's power supply department and the world are subjected to the country of ice and snow harm, all are badly in need of carrying out this work.
Description of drawings
Fig. 1 is the circuit connection diagram between two transformer stations;
Fig. 2 is that the power transmission line overhead ground wire adopts a slice insulator every playing structural representation.Wherein: transformer station 1; The transmission line 2 of molten ice and snow; Turnover line 3 on two substation architecture; The fastening hook 4 of lead; Special transformer 5; Power line connects 6; Output LOW voltage 7; Transformer grounding line 8; Send electric operating desk 9; Power-cutting switch 10; Prop up the tripod 11 of support sending electric lead; Short circuit operating desk 12; The fastening short circuit anchor post 13 of solid conductor; Short circuit operating handle 14; Lead 15; Overhead ground wire 16, a slice insulator 17, joining seam 18, metallic support 19; Joining seam line 20; Iron tower 21; Downlead 22.
Embodiment
The invention will be further described in conjunction with the accompanying drawings below by embodiment.
Embodiment 1
As shown in Figure 1, a kind of method that present embodiment is described with the low voltage and high current melting ice and snow on power transmission and distribution lines, it comprises that employing need melt the transmission line 2 of ice and snow and the transformer station 1 at transmission line two ends, on the turnover line of an end transformer station of the transformer station 1 at transmission line 2 two ends, connect and send electric operating desk 9, by power-cutting switch 10 output 12V to 80V low-voltages, on the turnover line of the transformer station 1 of transmission line 2 other ends, connect short circuit operating desk 12; On the turnover line 3 of the transformer station 1 of transmission line 2 one ends of need fusings ice and snow, carry out the low tension input operation, on the short circuit operating desk 12 that other end transformer station 1 connects, carry out the short circuit operation, make the snow cover acquisition heat that needs fusing on the transmission line 2 and melt.The turnover line 3 of transformer station 1 is connected with sending electric operating desk 9 and short circuit operating desk 12 by the fastening hook 4 of lead.
Input 12V to 80V low-voltage on the turnover line 3 of described transformer station 1 at an end between the transmission line 2, be that power supply by special transformer 5 send electricity to realize, described special transformer 5, its input is 1 to be that 10 kilovolts of high pressure are made power supply, special transformer 5 output voltages are two pole tensions, 80 volts of one-levels, another is 12 volts low-voltage output very, and special transformer adopts 200 amperes to 300 amperes transformer.Special transformer 5 connects 6 input power supplys by power line, and output LOW voltage 7; Output LOW voltage 7 is 12 volts and 80 volts of two ends, and special transformer 5 passes through transformer grounding line 8 ground connection when using.
Industrial, special transformer 5 is used for metal smelting.Special transformer 5 usefulness among the present invention be that the 10kV high pressure is done power supply, output voltage is the two poles of the earth, a 80V very, another is 12V very.This is that a kind of three-phase low voltage and high current transformer 5 can be tailor-made in transformer production producer.Three support porcelain vase sheets are installed on the crossbeam of the tripod 11 of support sending electric lead, are used for fixing and send electric lead to avoid sending electric lead ground connection.The tripod 11 that props up the support sending electric lead can decide the quantity of tripod according to the length of sending electric lead.When melting ice and snow, with power-cutting switch 10 closures, at this moment the voltage of the 12V of special transformer or 80V is delivered on the transmission line 2 by sending electric lead.
The blast when operating and the arc light of generation in order to reduce short circuit, 110 kilovolts, 12 volts of voltages inputs of the used for transmission line of two-conductor line more than 220 kilovolts and 500 kilovolts, 10 kilovolts of lines and short 80 volts of voltages of used for transmission line are imported.
The operation of short circuit for convenience is provided with short circuit operating handle 14 on short circuit operating desk 12.
During operation, the blast that produces when 12 volts and 80 volts of voltage short circuits is minimum, short circuit operating desk 12 is provided with anchor post 13, there are 3 carbon-points to link to each other in the operating desk with anchor post 13, the collision of these three carbon-points of operating handle 14 control with separate, the arc light that produces in collision place is big, but the strength ratio electric welding is much smaller.Operating personnel must be with degree of depth tinted glasses.Everywhere heat is consistent on lead.When separating carbon-point, the distance between the carbon-point should not be drawn back excessive, generally between 5cm to 10cm.Because in certain distance, when carbon-point separated, the distance between them was directly proportional with the intensity that produces arc light.10 kilovolt will disconnect the order of the distribution transforming in circuit gram switch with 80 volts, and the fusing fuse of the disconnecting link switch in branch line and the circuit is replaced with copper cash.The staff of the main line end and the branch line end will accept commander in chief's phone, and sight path length and ice-melt situation are controlled at the time in 5～10 seconds, and short circuit simultaneously disconnects simultaneously.Send electricity from transformer station's outlet bar, do the short circuit operation at circuit end bar and branch line end bar farthest.The short circuit tool making is simple.Because big high-voltage fuse all is unable to bear the temperature of big electric current again, the disconnect disconnecting link is arranged in the circuit, will linking up with copper cash of high-voltage fuse particularly arranged.
As shown in Figure 2, be a basic iron tower, the 16th, overhead ground wire, the 17th, a slice insulator, the 18th, joining seam is to use and overhead ground wire 16 the same specifications, long steel strand wire of 1.5m or steel reinforced aluminium conductor are the joining seam 18 that joining seam line 20 is done, metallic support 19.What accompanying drawing 2 was painted is the annexation of iron tower 21, overhead ground wire 16, joining seam line 20 under normal condition, and at this moment, overhead ground wire 16 is by joining seam line 20 and metallic support 19 ground connection.The present invention will make accompanying drawing 2 overhead ground wires 16 of transmission line with a slice insulator 17 into every rising, every have a slice insulator 17 of all will using of overhead ground wire 16 to isolate, with making joining seam line 20, connect overhead ground wire 16 and tower grounding with the steel strand wire or the steel reinforced aluminium conductor of 1.5 meters length of accompanying drawing 2 overhead ground wires 16 the same specifications.Do not have each end of the year and before thunderstorm season snows the joining seam 18 of 1.5 meters joining seam lines on the circuit is untied, and colligation is on metallic support 19.This moment, overhead ground wire 16 was earth-free state, so be called insulated static wire.Terminal shaft tower at accompanying drawing 1 transformer station two draws down to the earth connection of ground with the insulated copper lead of the same specification of overhead ground wire with two.Untie when circuit congeals, the molten ice and snow of short circuit just can be carried out the work.After removing the ice and snow on the overhead ground wire, the downlead 22 at accompanying drawing one two is recovered ground connection.The circuit ice and snow that congeals repeatedly can repeat the work of molten ice and snow.In a planned way carry out deicing work, do not influence the electricity consumption of industrial and agricultural production and people's normal life.Unify call command by on-the-spot person in overall before the molten ice, operation is commanded by the work on the spot director by two transformer stations, establishes the special messenger with lower aloft on the circuit and observes molten ice condition condition and notify the commander in chief and send electric person in overall.Serve electricity back notice short circuit director, commander's short circuit operating personnel carry out the short circuit operation, and duration of short circuit should not be grown, and is controlled at (sight path length and ice-melt situation suitably increase and decrease the time and select transformer for use) in 5 seconds to 10 seconds.The heat melts ice and snow that produces during the short circuit operation, the water that fusing ice and snow produces plays a part cooling, guardwire and overhead ground wire, is can not burn out lead and overhead ground wire in the short time.Fast with 12 volts and the molten speed of icing of 80 volts of low-voltages, it is laborsaving to economize the people, and it is safe need not rod-rising tower just can melting away the ice and snow that covers lead, can avoid coagulating the power outage of the ice and snow weather broken string of falling the shaft tower.The order of molten ice and snow is a pilot line, back overhead ground wire.
Claims (7)
1. method with the low voltage and high current melting ice and snow on power transmission and distribution lines, it comprises that employing need melt the electric line of ice and snow and the transformer station at transmission line two ends, two ends at transmission line, be on the turnover line of transformer station, the one end connects 12 volts to 80 volts low-voltage, and the other end connects the short circuit operating desk; When need fusing ice and snow, carry out the low tension output function at an end that connects low-voltage, carry out the short circuit operation at an end that connects the short circuit operating desk, make and realize low voltage and high current on the electric line that needs fusing ice and snow and produce heat, thereby make the ice and snow acquisition heat that needs fusing on the electric line and melt.
2. a kind of method according to claim 1 with the low voltage and high current melting ice and snow on power transmission and distribution lines, it is characterized in that the low-voltage of input is to realize by the out-put supply of special transformer on the turnover line of described transformer station at electric line one end; Described special transformer is a three-phase low voltage and high current transformer, its input is that 10 kilovolts of high pressure are made power supply, and output voltage is two pole tensions, 80 volts of utmost points, another is 12 volts low-voltage output very, and the output current of described transformer is 200 amperes to 300 amperes.
3. a kind of method according to claim 1 and 2 with the low voltage and high current melting ice and snow on power transmission and distribution lines, it is characterized in that described short circuit operating desk, the carbon-point and the short circuit operating handle that comprise contact short circuit make carbon-point realize the short circuit operation between the lead of required short circuit by the short circuit operating handle; The short circuit operation is to be duration of short circuit with the second, and collision realizes back and forth between each utmost point of the lead that the need short circuit is operated, and the time of short circuit operation was controlled at 5 seconds to 10 seconds.
4. a kind of method according to claim 1 and 2 with the low voltage and high current melting ice and snow on power transmission and distribution lines, when it is characterized in that described electric line is transmission line, overhead ground wire, the on-insulated overhead ground wire of the on-insulated overhead ground wire of transmission line and transformer station's turnover line is transformed into insulated static wire; To be transformed into on-insulated overhead ground wire and use a slice porcelain insulator, and long with 1.5m, and with the joining seam line of the same specification of overhead ground wire, its two ends connect on shaft tower ironware and the overhead ground wire and ground connection by porcelain insulator; On the terminal pole of two ends transformer station, draw down to the earth connection of ground with two insulated conductors with the same specification of overhead ground wire; To untie joining seam line on the overhead ground wire and colligation before the molten ice and snow earlier on the shaft tower metallic support, again the downlead in the transformer station of circuit two ends be untied; This moment, overhead ground wire was earth-free state, and the molten ice and snow of short circuit just can be carried out the work; After removing the ice and snow on lead and the overhead ground wire, the downlead at two is recovered ground connection; The circuit ice and snow that congeals repeatedly can repeat the work of molten ice and snow.
5. a kind of method according to claim 3 with the low voltage and high current melting ice and snow on power transmission and distribution lines, when it is characterized in that described electric line is transmission line, overhead ground wire, the on-insulated overhead ground wire of the on-insulated overhead ground wire of transmission line and transformer station's turnover line is transformed into insulated static wire; To be transformed into on-insulated overhead ground wire and use a slice porcelain insulator, and long with 1.5m, and with the joining seam line of the same specification of overhead ground wire, its two ends connect on shaft tower ironware and the overhead ground wire and ground connection by porcelain insulator; On the terminal pole of two ends transformer station, draw down to the earth connection of ground with two insulated conductors with the same specification of overhead ground wire; To untie joining seam line on the overhead ground wire and colligation before the molten ice and snow earlier on the shaft tower metallic support, again the downlead in the transformer station of circuit two ends be untied; This moment, overhead ground wire was earth-free state, and the molten ice and snow of short circuit just can be carried out the work; After removing the ice and snow on lead and the overhead ground wire, the downlead at two is recovered ground connection; The circuit ice and snow that congeals repeatedly can repeat the work of molten ice and snow.
6. a kind of method according to claim 1 and 2 with the low voltage and high current melting ice and snow on power transmission and distribution lines, when it is characterized in that described electric line is 10 KV distribution circuits, 10 KV distribution circuits are provided with one section cable and the lead of insulation are arranged, the work of the molten ice and snow of short circuit will be avoided cable and insulated conductor is arranged, and at uninsulated conductor and cable, have the junction of insulated conductor to carry out; Before the molten ice and snow, distribution transforming disconnecting link switches all in the 10kV distribution line is disconnected, the high-voltage fuse in the circuit will be with the copper cash that is not less than φ 16mm; When melting ice and snow, carry out low voltage and high current at transformer station's outlet bar and send electricity, short circuit is at distribution line terminal pole and the enterprising line operate of branch line terminal pole.
7. a kind of method according to claim 3 with the low voltage and high current melting ice and snow on power transmission and distribution lines, when it is characterized in that described electric line is 10 KV distribution circuits, 10 KV distribution circuits are provided with one section cable and the lead of insulation are arranged, the work of the molten ice and snow of short circuit will be avoided cable and insulated conductor is arranged, and at uninsulated conductor and cable, have the junction of insulated conductor to carry out; Before the molten ice and snow, distribution transforming disconnecting link switches all in the 10kV distribution line is disconnected, the high-voltage fuse in the circuit will be with the copper cash that is not less than φ 16mm; When melting ice and snow, carry out low voltage and high current at transformer station's outlet bar and send electricity, short circuit is at distribution line terminal pole and the enterprising line operate of branch line terminal pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102143790A CN101667722B (en) | 2008-09-05 | 2008-09-05 | Method for melting ice and snow on power transmission and distribution lines by low voltage and high current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102143790A CN101667722B (en) | 2008-09-05 | 2008-09-05 | Method for melting ice and snow on power transmission and distribution lines by low voltage and high current |
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| CN101667722A CN101667722A (en) | 2010-03-10 |
| CN101667722B true CN101667722B (en) | 2011-07-20 |
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| CN2008102143790A Expired - Fee Related CN101667722B (en) | 2008-09-05 | 2008-09-05 | Method for melting ice and snow on power transmission and distribution lines by low voltage and high current |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136711A (en) * | 2011-01-20 | 2011-07-27 | 何正华 | Method for forming resistance heat to melt ice on high-tension line with low tension |
| CN102231506A (en) * | 2011-07-13 | 2011-11-02 | 潘明清 | Device and method for rapidly melting ice and snow of transmission line |
| CN102611061B (en) * | 2012-03-13 | 2015-06-24 | 云南电力试验研究院（集团）有限公司电力研究院 | Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) |
| CN102780193B (en) * | 2012-07-06 | 2015-08-19 | 广东电网公司电力科学研究院 | A kind of power transmission line overhead ground wire electric current de-icing method |
| CN104049158A (en) * | 2014-05-13 | 2014-09-17 | 国家电网公司 | Single-phase instant artificial grounding short-circuit test system for power transmission line |
| CN104953529B (en) * | 2015-03-05 | 2017-07-11 | 国家电网公司 | A kind of online de-icing method of distribution line based on single-phase earth fault current |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2130295Y (en) * | 1992-05-09 | 1993-04-21 | 能源部武汉高压研究所 | Automatic ice-melting device for transmission line without power-cut |
| US6018152A (en) * | 1999-04-13 | 2000-01-25 | Allaire; Marc-Andre | Method and device for de-icing conductors of a bundle of conductors |
| CN200944519Y (en) * | 2006-08-29 | 2007-09-05 | 薛辉 | Automatic ice-melting device for transmission line |
| CN101162831A (en) * | 2007-10-12 | 2008-04-16 | 龚良贵 | Divided conductor powerline with loading ice melting scheme |
-
2008
- 2008-09-05 CN CN2008102143790A patent/CN101667722B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2130295Y (en) * | 1992-05-09 | 1993-04-21 | 能源部武汉高压研究所 | Automatic ice-melting device for transmission line without power-cut |
| US6018152A (en) * | 1999-04-13 | 2000-01-25 | Allaire; Marc-Andre | Method and device for de-icing conductors of a bundle of conductors |
| CN200944519Y (en) * | 2006-08-29 | 2007-09-05 | 薛辉 | Automatic ice-melting device for transmission line |
| CN101162831A (en) * | 2007-10-12 | 2008-04-16 | 龚良贵 | Divided conductor powerline with loading ice melting scheme |
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| CN101667722A (en) | 2010-03-10 |
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