CN103247992B - The direct current ice melting method of the common overhead ground wire of transmission line and OPGW - Google Patents
The direct current ice melting method of the common overhead ground wire of transmission line and OPGW Download PDFInfo
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Abstract
The invention discloses the direct current ice melting method of the common overhead ground wire of a kind of transmission line and OPGW, belong to circuit de-icing method.First common overhead ground wire and OPGW are carried out all insulation by the present invention, then transform circuit according to different Transmission level, by connecting line sectionalizing, transposition, and coordinate ice-melt power supply and ice-melt switch to realize flexible, circuit deicing efficiently.The present invention achieves the common overhead ground wire of various transmission line and the ice-melt operation of OPGW flexibly, saves resource, improves ice-melt efficiency; Common overhead ground wire is connected with OPGW segmentation transposition, by the induction high voltage control on circuit in rational scope, reduce the induced voltage on circuit, also greatly reduce the electric energy loss on circuit simultaneously, energy-saving effect is remarkable, also has acceleration arc blowout effect to discharging gap simultaneously; The all insulation of common overhead ground wire and OPGW, eliminates electrical network hidden danger, and the electric power accident preventing the blast of old-fashioned porcelain insulator from causing, improves power circuit security performance.
Description
Technical field
The invention belongs to the de-icing method of common overhead ground wire and OPGW in overhead transmission line.
Background technology
Overhead ground wire is mainly divided into common overhead ground wire as steel strand wire or good conductor ground wire and Optical Fiber composite overhead Ground Wire (being called for short OPGW).Common overhead ground wire mainly adopts the earthing mode by base ground connection and graded insulation single-point grounding, and OPGW, owing to having the dual-use function of ground wire and communications optical cable concurrently, generally adopts the earthing mode by base ground connection.For existing common overhead ground wire and OPGW, there is following technological deficiency: 1) the direct ground connection of common overhead ground wire of many shaft towers, what have is then segmented ground, can waste a large amount of electric energy, causes huge power loss to electric power system; 2) the old-fashioned ceramic ground insulator existing common overhead ground wire and OPGW used can produce zero voltage, and causes electric power accident thus; 3) because OPGW is by base ground connection, segmented ground, the accident such as disconnected core, disconnected stock can be caused when being struck by lightning; 4) due to by base ground connection, when ice damage, common overhead ground wire and OPGW can not effectively ice-melts, can cause the accidents such as shaft tower collapses, broken string.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of direct current ice melting method integrating ice-melt, the common overhead ground wire of transmission line that is energy-conservation, line loss reducing several functions and OPGW.In the face of the OPGW ice-melt of current national grid 220kV and above power transmission line 500,000 kilometers, not change OPGW for foothold, make full use of original resource, and when not needing to increase tower head, saving resource is when being aim, researches and develops this scheme.Long distance superhigh pressure, extra-high voltage transmission line to be run and the circuit installing OPGW can not replace, caused induction too high and develop the program and solve this and affect an energy-conservation and difficult problem that is ice-melt for many years.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the direct current ice melting method of the common overhead ground wire of a kind of transmission line and OPGW, comprises the steps:
The first step, carries out all insulation operation by the common overhead ground wire on transmission line and OPGW;
Second step, carries out track remodelling to common overhead ground wire and OPGW, different for different transmission line modification scheme:
1) for 110kV transmission line of alternation current: keep standing state constant after common overhead ground wire and OPGW all insulation;
2) for 220-1000kV transmission line of alternation current: common overhead ground wire and OPGW are carried out segmentation by section gap, the segmentation transposition switch of segmentation transposition effect has been installed in the segmentation position of common overhead ground wire, in the segmentation position of OPGW, photodetachment device has been installed; When containing a common overhead ground wire and an OPGW in transmission line, the section gap of common overhead ground wire and OPGW is equal, transposition between the segmentation of same segment position on two circuits transposition switch and photodetachment device is connected; When containing two common overhead ground wires in transmission line, the section gap of two common overhead ground wires is equal, the transposition of the segmentation of two circuit same segment positions transposition switch is connected; When transmission line containing two OPGW, the section gap of two OPGW is equal, the transposition of the photodetachment device of same segment position on two OPGW is connected; During not ice-melt, adjustment segmentation transposition switch and/or photodetachment device, make two circuits run on transposition operating state;
3) for 400-1000kV DC power transmission line: according to section gap two common overhead ground wires, between two OPGW or common overhead ground wires and an OPGW install more than one ice-melt switch;
3rd step, determines the icing part of path needing ice-melt, and utilize ice-melt power supply and ice-melt switch to coordinate and carry out ice-melt operation, concrete operation method is: when transmission line is only containing a common overhead ground wire or an OPGW, adopt option A; When transmission line contains two common overhead ground wires or two OPGW or common overhead ground wires and an OPGW, adopt option b;
Described option A is: one end ice-melt power supply being arranged on icing part of path, ice-melt switch is arranged on the other end of icing part of path, the first common overhead ground wire or an OPGW, ice-melt power supply and ice-melt switch are connected to form DC ice melting loop by the earth or the second common overhead ground wire or the 2nd OPGW or hollow wire;
Described option b is: one end ice-melt power supply being arranged on icing part of path, install ice-melt switch at the other end of icing part of path, adjacent common overhead ground wire, adjacent OPGW or common overhead ground wire and OPGW are connected to form DC ice melting loop by ice-melt power supply and ice-melt switch;
4th step, when adopting option A in above-mentioned 3rd step, closed ice-melt switch, carries out ice-melt operation; When adopting option b in above-mentioned 3rd step, for transmission line of alternation current, first the segmentation transposition switch on common overhead ground wire and/or the photodetachment device on OPGW is adjusted as required, two common overhead ground wires adjacent on icing part of path, two OPGW or common overhead ground wire and OPGW is made to be in separately independently normal operating condition, then closed ice-melt switch, carries out ice-melt operation; For DC power transmission line, selectivity closes ice-melt switch and carries out ice-melt operation.
Described all insulation is operating as: 1) common overhead ground wire and OPGW are insulated by being with the synthetic material ground insulator of portable protective gaps; 2) insulating sleeve of the drop wire clip 35kV of common overhead ground wire and OPGW insulate, and the cable splice closure simultaneously on drop wire clip, remaining cable box and OPGW adopts the pressure-resistant material of 35kV grade to insulate; 3) downlead of the upper cable splice closure of OPGW adopts and the good conductor electric wire short circuit of OPGW with cross section.
The two ends of described segmentation transposition switch are connected with common overhead ground wire, and while replaces be connected with replace switch or photodetachment device of other segmentation.
When circuit runs on transposition operating state, segmentation transposition switch is in off-state.
At ice-melt power supply and common overhead ground wire, be provided with control switch between ice-melt power supply and OPGW, the model of described control switch is 35kV/2000A.
The section gap of described common overhead ground wire and OPGW is to ensure that the induced voltage on sectionalized line is not as the criterion higher than 20kV.
Described ice-melt power supply is existing DC ice melting power supply or mobile ice-melting vehicle in plant stand, and the model of described ice-melt switch is 35kV/2000A.
The beneficial effect adopting technique scheme to obtain is:
1) the present invention is utilized can to carry out ice-melt operation to the common overhead ground wire of various transmission line and OPGW very flexibly, can single ice-melt, can double joint ice-melt, can segmentation, subregion, timesharing ice-melt, make full use of original circuit, greatly save resource, improve ice-melt efficiency, reach the object that ice-melt is energy-conservation;
2) program is connected replacing after common overhead ground wire and OPGW segmentation, by the induction high voltage control on circuit in rational scope, reduce the induced voltage on circuit, also greatly reduce the electric energy loss on circuit simultaneously, energy-saving effect is remarkable, also has acceleration arc blowout effect to discharging gap simultaneously;
3) all insulation of common overhead ground wire and OPGW eliminates electrical network hidden danger, and the electric power accident preventing the blast of old-fashioned porcelain insulator from causing, improves power circuit security performance;
4) program can be applied to all kinds of transmission line, and universality is good; And in actual implementation process, according to this scheme flexible, multiple different ice-melt scheme can be derived, for existing ice-melt engineering, there is higher Technical Reference and be worth.
Accompanying drawing explanation
Fig. 1 is that 110kV transmission line of alternation current is only containing ice-melt conceptual scheme when a common overhead ground wire or OPGW;
Fig. 2 is the ice-melt conceptual scheme of 110kV transmission line of alternation current when containing a common overhead ground wire and an OPGW;
Fig. 3 is the ice-melt conceptual scheme of 220kV-1000kV transmission line of alternation current when containing a common overhead ground wire and an OPGW;
Fig. 4 is the structural representation that Fig. 3 is in transposition operating state;
Fig. 5 is the structural representation that Fig. 3 is in ice-melt operating state;
Fig. 6 is the ice-melt conceptual scheme of 400kV-1000kV DC power transmission line when containing a common overhead ground wire and an OPGW
Fig. 7 is the ice-melt conceptual scheme derived.
Embodiment
Composition graphs 1 to Fig. 7, is further described in more detail ice-melt scheme of the present invention.
For different transmission line, detailed explanation is carried out to the DC De-icing Scheme of the common overhead ground wire of transmission line and OPGW.
Following embodiment is all carry out under the prerequisite of transmission line power failure.
For the line ice-melting of 110kV transmission line of alternation current, concrete ice-melt is operating as:
The first step, by common overhead ground wire and OPGW all insulation; Concrete operations are: 1) common overhead ground wire and OPGW are insulated by being with the synthetic material ground insulator of portable protective gaps; 2) downlead of common overhead ground wire and OPGW adopts the insulating sleeve of 35kV to insulate, and the cable splice closure simultaneously on drop wire clip, remaining cable box and OPGW adopts the pressure-resistant material of 35kV grade to insulate; 3) downlead of the upper cable splice closure of OPGW adopts and the good conductor electric wire short circuit of OPGW with cross section.
Second step, because the distance in 110kV transmission line of alternation current between shaft tower is not far, the induced voltage on circuit is not high, does not therefore do further transformation to circuit, keeps circuit former state.During ice-melt, only need install control switch at each circuit two ends and be convenient to access ice-melt power supply.
3rd step, determines the icing part of path needing ice-melt, utilizes ice-melt power supply and ice-melt switch to coordinate and carries out ice-melt operation.On 110kV transmission line of alternation current, the form of overhead ground wire is generally: only contain a common overhead ground wire, only containing an OPGW, a common overhead ground wire and an OPGW, two common overhead ground wires, two OPGW.When only containing a common overhead ground wire or an OPGW, adopt option A, ice-melt power supply is arranged on one end of icing part of path, ice-melt switch is arranged on the other end of icing part of path, first common overhead ground wire or an OPGW, ice-melt power supply and ice-melt switch are connected to form DC ice melting loop by the earth or the second common overhead ground wire or the 2nd OPGW or hollow wire, as schemed, 1 shows, after closed ice-melt switch, direct current can flow through and realize ice-melt in this loop.Certainly, common overhead ground wire or OPGW or other wires etc. that also the earth can be changed into other form ice-melt loop.
When transmission line contains a common overhead ground wire and an OPGW or two common overhead ground wire or two OPGW, to be introduced containing a common overhead ground wire and an OPGW, at this moment need to adopt option b, change the earth in Fig. 1 into adjacent common overhead ground wire or OPGW, like this, common overhead ground wire, ice-melt power supply, ice-melt switch and OPGW form DC ice melting loop, as shown in Figure 2.Certainly, also any in common overhead ground wire or OPGW and adjacent ABC three phase transmission line can be connected to form ice-melt loop, ice-melt while so just can realizing common overhead ground wire or OPGW and ABC three phase transmission line.
4th step, closed ice-melt switch carries out DC ice melting operation.DC voltage and current in ice-melt loop is adjusted slowly, and the operating instruction of ice-melting device is shown in operation in detail.
For the line ice-melting of 220kV-1000kV transmission line of alternation current, concrete operation step is:
The first step, by common overhead ground wire and OPGW all insulation, concrete operations are the same with the operation in 110kV transmission line.
Second step, 220kV-1000kV transmission line of alternation current all contains two common overhead ground wires or a common overhead ground wire and OPGW or two OPGW tri-kinds of situations usually.For 220kV transmission line of alternation current, when circuit is shorter, the induced voltage on common overhead ground wire and OPGW usually can not be very high, therefore do not need to carry out segment processing, according to the ice-melting mode ice-melt of 110kV; When circuit is longer, in order to ensure that the induced voltage on common overhead ground wire and OPGW is no more than 20kV, just need to carry out segmentation transformation to circuit, usual section gap is that 100km just can reach this standard.330-1000kV transmission line of alternation current all needs segment processing usually, and section gap is to ensure that the induced voltage on sectionalized line is not as the criterion higher than 20kV.For common overhead ground wire, segmentation place arranges segmentation transposition switch and connects, for OPGW, segmentation place arranges photodetachment device, photodetachment device had not only separated optical fiber in OPGW and high pressure but also can Transmission Fibers signal (in the present invention there being the model of photodetachment device from 35kV to 1000kV, can select according to the voltage of actual transmission line).Section gap on adjacent two common overhead ground wires or two OPGW or common overhead ground wires and an OPGW should be consistent, and the segmentation of same segment position transposition switch and/or photodetachment device are carried out transposition connection.When containing a common overhead ground wire and an OPGW, the segmentation transposition switch of same segment position and photodetachment device carry out transposition and are connected that (concrete connected mode is shown in the specification of equipment, those skilled in the art can understand according to the specification of photodetachment device how to connect), transposition connect after state as shown in Figure 3.When containing two common overhead ground wires, the segmentation of same segment position transposition switch cross is connected and can realize transposition connection.When containing two OPGW, the input and output of adjustment photodetachment device, also easily can realize transposition and connect.
Below to introduce transposition operating state in detail containing a common overhead ground wire and an OPGW, specifically as shown in Figure 4.
Suppose common overhead ground wire to divide into N section with OPGW according to identical section gap, be respectively the 1st section, the 2nd section ..., N section.By segmentation transposition switch opens in common overhead ground wire, like this, the 1st section of common overhead ground wire, the 2nd section of OPGW, the 3rd section of common overhead ground wire ... according to this rule, the odd number section of common overhead ground wire and the even number section of OPGW are just cross-linked to form a path; In like manner, the odd number section of OPGW and the even number section of common overhead ground wire are cross-linked and also form path, and two interlaced connections of circuit constitute transposition operating state.Induced voltage in common overhead ground wire and each segmentation of OPGW, not higher than 20kV, so just greatly reduces the electric energy loss on circuit.
3rd step, determines the icing part of path needing ice-melt, utilizes ice-melt power supply and ice-melt switch to coordinate and carries out ice-melt operation.Adopt option b, ice-melt power supply and ice-melt switch are arranged between OPGW between adjacent common overhead ground wire, adjacent or between common overhead ground wire and OPGW and form ice-melt loop, ice-melt power supply is positioned at one end of icing part of path, and ice-melt switch is positioned at the other end of icing part of path.In order to ensure the safety that ice-melt operates further, at ice-melt power supply and common overhead ground wire, between ice-melt power supply and OPGW, be provided with control switch.Based on Fig. 3 and Fig. 4, ice-melt power supply and ice-melt switch should be arranged between common overhead ground wire and OPGW.
4th step, first the segmentation transposition switch on common overhead ground wire and the photodetachment device on OPGW is adjusted, make common overhead ground wire adjacent on icing part of path and OPGW be in separately independently normal operating condition, then closed ice-melt switch, carries out ice-melt operation.Or specifically introduce ice-melt scheme for a common overhead ground wire and an OPGW, as shown in Figure 5.Segmentation transposition switches all in overhead ground wire common on icing part of path can be closed, like this, common overhead ground wire on icing part of path and OPGW are just in pass-through state respectively, and the common overhead ground wire beyond icing part of path and OPGW are still in the transposition operating state be cross-linked.Ice-melt power supply, ice-melt switch and straight-through common overhead ground wire, OPGW define DC ice melting loop, the control switch on closed ice-melt power supply, and closed ice-melt switch can carry out DC ice melting operation simultaneously.Another kind segmentation ice-melting mode more flexibly can also be had, be exactly only the segmentation needed in the section of ice-melt transposition switch is closed, like this, closed segmentation transposition switch, ice-melt power supply and on control switch, common overhead ground wire and OPGW form DC loop, ice melting current flows through this loop and carries out ice-melt.As shown in Figure 5, suppose to carry out ice-melt to common overhead ground wire the 1st section and OPGW the 1st section, so closed by the segmentation transposition switch of the 1st on common overhead ground wire, such ice-melt power supply, common overhead ground wire the 1st section, OPGW the 1st section just define ice-melt loop.And other segmentation transposition switches being in off-state can not form other ice-melt loops on icing part of path, common overhead ground wire therebetween and OPGW are still in transposition operating state.So just can realize sectional ice-melt very flexibly, avoid ice-melt switch in non-DC ice-melting repeat install and operation.
For the ABC three phase transmission line in transmission line, also track remodelling can be carried out according to the form of common overhead ground wire and OPGW, then ice-melt loop is connected to form with common overhead ground wire and OPGW, to realize the DC ice melting synchronous with common overhead ground wire and OPGW.
For the line ice-melting of 400-1000kV DC power transmission line, concrete ice-melt is operating as:
The first step, by common overhead ground wire and OPGW all insulation, concrete operations are the same with the operation in 110kV transmission line.
Second step, 400kV DC power transmission line is usually containing two common overhead ground wires or a common overhead ground wire and OPGW or two OPGW.In DC power transmission line, the too high problem of high pressure is responded to after there is not common overhead ground wire and OPGW all insulation, therefore, do not need transposition, only need according to section gap at two common overhead ground wires, between two OPGW or common overhead ground wires and an OPGW, more than one ice-melt switch is installed, as shown in Figure 6.Meanwhile, must ensure two downleads of cable splice closure on OPGW with the good conductor wire short circuit of OPGW with cross section, to ensure that DC ice melting current is unimpeded.
3rd step, determine the icing part of path needing ice-melt, adopt option b, ice-melt power supply and ice-melt switch are arranged between OPGW between adjacent common overhead ground wire, adjacent or between common overhead ground wire and OPGW and form ice-melt loop, ice-melt power supply is positioned at one end of icing part of path, and ice-melt switch is positioned at the other end of icing part of path.In order to ensure the safety that ice-melt operates further, at ice-melt power supply and common overhead ground wire, between ice-melt power supply and OPGW, be provided with control switch.
4th step, selects the icing part of path needing ice-melt, ice-melt power supply and the control switch between common overhead ground wire and OPGW is closed, and close needs the ice-melt switch in ice-melt region to carry out DC ice melting operation simultaneously.So just achieve segmentation ice-melt.
Ice-melt power supply used in the present invention is plant stand existing DC ice melting power supply or mobile ice-melting vehicle, and in order to cost-saving, first-selected existing equipment, utilizes the DC ice melting power supply in plant stand can also realize ice-melt at times simultaneously, improve ice-melt efficiency.The model of ice-melt switch used is 35kV/200A.
For the situation containing two common overhead ground wires or two OPGW or common overhead ground wires and an OPGW in power delivery circuit in the present invention, only explain for a common overhead ground wire and an OPGW and introduce, other two kinds of situations are also process according to this example, and those skilled in the art can know that errorless carrying out is understood.
According to the solution of the present invention, multiple ice-melt scheme flexibly can be derived.Remark additionally with one below, as shown in Figure 7.
For a common overhead ground wire in 220-1000kV transmission line of alternation current and an OPGW, with ice-melt scheme above unlike, between common overhead ground wire and OPGW, be provided with two ice-melt switches.Meanwhile, by ice-melt power ground, by the node of two ice-melt switches also ground connection.Material is thus formed two ice-melt loops, article one, be trolley wire, the loop that formed of ice-melt power supply, the earth and one of them ice-melt master switch (switch above in figure), one be OPGW, the loop that formed of ice-melt power supply, the earth and another ice-melt master switch (switch below in figure).Ice-melt effect can be reached so more flexible again, namely can only carry out ice-melt to common overhead ground wire or only ice-melt be carried out to OPGW, also can carry out ice-melt to common overhead ground wire and OPGW simultaneously.Those skilled in the art can develop as example and various similar ice-melt scheme.
Method of the present invention covers most situation on transmission line, applied widely.The particularly proposition of common overhead ground wire and OPGW all insulation and transposition operating state, existing ice-melt, problem that is energy-conservation and line loss are solved in the lump, both ensure that effective ice-melt, ensure that induced voltage on circuit is not higher than 20kV by segmentation transposition again, reduce the induced voltage in circuit, power loss thereupon on circuit and expense also just considerably reduce, reduction amplitude can reach 64 times, if national transmission line can adopt this kind of scheme, the energy so saved will be very huge.The 110kV transmission line of alternation current of 1000km after all insulation, economize on electricity in a year about 500,000 degree, the 220kV transmission line of alternation current of 1000km, economize on electricity in a year about 2,250,000 degree.The 500kV transmission line of alternation current of 900km, economize on electricity in a year about 1,000 ten thousand degree, is equivalent to one the 3000 kilowatts coal burner groups energy output of a year, economizes on coal about 5000 tons/year.The 1000kV transmission line of alternation current of 1000km, economize on electricity in a year about 4,000 ten thousand degree, is equivalent to one the 12000 kilowatts coal burner groups energy output of a year, economizes on coal about 20000 tons/year.China has the 220kV transmission line of alternation current of 500,000 kilometers, the big the first in the world of its scale, and adopt this scheme if complete, its energy-saving effect is well imagined, 1 year economize on electricity about 5,000,000,000 kilowatt hour after the 500000 kilometers of overhead ground wire all insulations process of initial estimate China.The transmission line of 110km more than about 1,000,000 kilometers, though energy-conservation little, also can not underestimate.From the effect analysis of social benefit and input and output, the fund that the common overhead ground wire of transformation plains region and OPGW only expend on the insulating material is 5000-8000 unit/kilometer, and because electric pressure is different, cost is different.Recoup the investment the time limit for the fastest superhigh pressure Above Transmission Lines, needs 1 year to 2 years.
This programme is particularly convenient in construction, for tangent tower, changing suspension insulator does not need to have a power failure, for strain tower, the high engineering troop of technical ability also can uninterrupted operation, for realize ice-melt remove the evil and energy-conservation, fall to damage and create good economic base and technical foundation.
Claims (7)
1. a direct current ice melting method of the common overhead ground wire of transmission line and OPGW, is characterized in that comprising the steps:
The first step, carries out all insulation operation by the common overhead ground wire on transmission line and OPGW;
Second step, carries out track remodelling to common overhead ground wire and OPGW, different for different transmission line modification scheme:
1) for 110kV transmission line of alternation current: keep standing state constant after common overhead ground wire and OPGW all insulation;
2) for 220-1000kV transmission line of alternation current: common overhead ground wire and OPGW are carried out segmentation by section gap, the segmentation transposition switch of segmentation transposition effect has been installed in the segmentation position of common overhead ground wire, in the segmentation position of OPGW, photodetachment device has been installed; When containing a common overhead ground wire and an OPGW in transmission line, the section gap of common overhead ground wire and OPGW is equal, transposition between the segmentation of same segment position on two circuits transposition switch and photodetachment device is connected; When containing two common overhead ground wires in transmission line, the section gap of two common overhead ground wires is equal, the transposition of the segmentation of two circuit same segment positions transposition switch is connected; When transmission line containing two OPGW, the section gap of two OPGW is equal, the transposition of the photodetachment device of same segment position on two OPGW is connected; During not ice-melt, adjustment segmentation transposition switch and/or photodetachment device, make two circuits run on transposition operating state;
3) for 400-1000kV DC power transmission line: according to section gap two common overhead ground wires, between two OPGW or common overhead ground wires and an OPGW install more than one ice-melt switch;
3rd step, determines the icing part of path needing ice-melt, and utilize ice-melt power supply and ice-melt switch to coordinate and carry out ice-melt operation, concrete operation method is: when transmission line is only containing a common overhead ground wire or an OPGW, adopt option A; When transmission line contains two common overhead ground wires or two OPGW or common overhead ground wires and an OPGW, adopt option b;
Described option A is: one end ice-melt power supply being arranged on icing part of path, ice-melt switch is arranged on the other end of icing part of path, the first common overhead ground wire or an OPGW, ice-melt power supply and ice-melt switch are connected to form DC ice melting loop by the earth or the second common overhead ground wire or the 2nd OPGW or hollow wire;
Described option b is: one end ice-melt power supply being arranged on icing part of path, install ice-melt switch at the other end of icing part of path, adjacent common overhead ground wire, adjacent OPGW or common overhead ground wire and OPGW are connected to form DC ice melting loop by ice-melt power supply and ice-melt switch;
4th step, when adopting option A in above-mentioned 3rd step, closed ice-melt switch, carries out ice-melt operation; When adopting option b in above-mentioned 3rd step, for transmission line of alternation current, first the segmentation transposition switch on common overhead ground wire and/or the photodetachment device on OPGW is adjusted as required, two common overhead ground wires adjacent on icing part of path, two OPGW or common overhead ground wire and OPGW is made to be in separately independently normal operating condition, then closed ice-melt switch, carries out ice-melt operation; For DC power transmission line, selectivity closes ice-melt switch and carries out ice-melt operation.
2. the direct current ice melting method of the common overhead ground wire of a kind of transmission line according to claim 1 and OPGW, is characterized in that described all insulation is operating as: 1) common overhead ground wire and OPGW are insulated by being with the synthetic material ground insulator of portable protective gaps; 2) insulating sleeve of the drop wire clip 35kV of common overhead ground wire and OPGW insulate, and the cable splice closure simultaneously on drop wire clip, remaining cable box and OPGW adopts the pressure-resistant material of 35kV grade to insulate; 3) downlead of the upper cable splice closure of OPGW adopts and the good conductor electric wire short circuit of OPGW with cross section.
3. the direct current ice melting method of the common overhead ground wire of a kind of transmission line according to claim 1 and OPGW, it is characterized in that the two ends of described segmentation transposition switch are connected with common overhead ground wire, while, replaces be connected with replace switch or photodetachment device of other segmentation.
4. the direct current ice melting method of the common overhead ground wire of a kind of transmission line according to claim 1 and OPGW, is characterized in that, when circuit runs on transposition operating state, segmentation transposition switch is in off-state.
5. the direct current ice melting method of the common overhead ground wire of a kind of transmission line according to claim 1 and OPGW, it is characterized in that at ice-melt power supply and common overhead ground wire, be provided with control switch between ice-melt power supply and OPGW, the model of described control switch is 35kV/2000A.
6. the direct current ice melting method of the common overhead ground wire of a kind of transmission line according to claim 1 and OPGW, is characterized in that the section gap of described common overhead ground wire and OPGW is to ensure that the induced voltage on sectionalized line is not as the criterion higher than 20kV.
7. the direct current ice melting method of the common overhead ground wire of a kind of transmission line according to claim 1 and OPGW, it is characterized in that described ice-melt power supply is existing DC ice melting power supply or mobile ice-melting vehicle in plant stand, the model of described ice-melt switch is 35kV/2000A.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106154448A (en) * | 2015-04-20 | 2016-11-23 | 中国电力科学研究院 | One can optical fiber composite overhead ground wire capable of melting ice connector box and attaching method thereof |
| CN105024335B (en) * | 2015-06-24 | 2018-05-04 | 国家电网公司 | OPGW DC ice meltings monitor system |
| CN104897214B (en) * | 2015-06-26 | 2016-12-07 | 国家电网公司 | OPGW icing ice-melt pilot system under natural environment |
| CN106329385B (en) * | 2015-07-03 | 2019-03-22 | 中国电力科学研究院 | A kind of OPGW ice covering thickness measurement method and its measuring device |
| CN110021904A (en) * | 2019-05-15 | 2019-07-16 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Automatic phase selecting disconnecting link |
| CN113541035B (en) * | 2021-05-27 | 2023-08-15 | 国网浙江省电力有限公司台州供电公司 | Accurate ice melting system for ground wires and optical cables |
| CN114362083A (en) * | 2021-12-02 | 2022-04-15 | 贵州电网有限责任公司 | Structure and method for multiplexing functions of MMC (modular multilevel converter) type ice melting device |
| CN114421402A (en) * | 2022-01-21 | 2022-04-29 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Ground wire ice melting operation one-key sequence control system based on OPGW communication |
| CN115296246B (en) * | 2022-08-26 | 2024-05-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | High-voltage direct-current uninterrupted ground wire ice melting circuit, equipment and operation method |
| CN115800169B (en) * | 2022-12-27 | 2023-06-09 | 西南交通大学 | Non-split-phase-area sectionally adjustable direct-current ice melting system applicable to overhead contact line and carrier cable ice coating |
| CN117175523B (en) * | 2023-11-03 | 2024-01-26 | 中国电力工程顾问集团西南电力设计院有限公司 | Method for inhibiting ice melting induced voltage of earth wire of uninterrupted AC line |
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| JP5323568B2 (en) * | 2009-04-16 | 2013-10-23 | 株式会社ビスキャス | Snow melting equipment for overhead power transmission lines |
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| CN102780193A (en) * | 2012-07-06 | 2012-11-14 | 广东电网公司电力科学研究院 | Current ice-melting method for overhead ground wires of electric transmission line |
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Effective date of registration: 20200902 Address after: 050000 southeast of Fangcun village, Yuhua District, Shijiazhuang City, Hebei Province Patentee after: SHIJIAZHUANG HUAHENG HARDWARE Co.,Ltd. Address before: 050021, room 23, 2-2101 Fu Qiang street, Yuhua District, Hebei, Shijiazhuang Patentee before: Chen Guangsheng |
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