CN205863868U - A kind of extra high voltage line ice melting system - Google Patents
A kind of extra high voltage line ice melting system Download PDFInfo
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- CN205863868U CN205863868U CN201620786830.6U CN201620786830U CN205863868U CN 205863868 U CN205863868 U CN 205863868U CN 201620786830 U CN201620786830 U CN 201620786830U CN 205863868 U CN205863868 U CN 205863868U
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Abstract
The utility model discloses a kind of extra high voltage line ice melting system, including extra high voltage line deicing device, two turn of three switching device, three-phase bus, first ground wire deicing access device, second ground wire deicing access device, wire ice-melt access device, wire ice-melt short-circuiting means and ground wire deicing short-circuiting means, for controlling extra high voltage line deicing device, two turn of three switching device, three-phase bus, first ground wire deicing access device, second ground wire deicing access device, wire ice-melt access device, the wire of ice-melt extra high voltage line treated by wire ice-melt short-circuiting means and ground wire deicing short-circuiting means and ground wire carries out ice-melt.This utility model can significantly improve the ice-melt efficiency of extra high voltage line, saves a large amount of personnel, simplifies execute-in-place, save a large amount of ice-melt time, ensure the safety of ice-melt personnel simultaneously, safely, quickly carry out extra high voltage line ice-melt work, thus ensure extra high voltage line power supply reliability.
Description
Technical field
This utility model relates to electrical engineering technical field, is specifically related to a kind of extra high voltage line ice melting system.
Background technology
National energy distribution is the most unbalanced with the distribution of load center, and the resource such as water power, coal is mainly distributed on western part
And the Northwest, and electricity needs is concentrated mainly on east and Southern Coast area, which dictates that China must carry out long distance
From, extensive, high efficiency transmission of electricity, to realize distributing electric power resource in China rationally.Extra-high voltage grid is to solve China
Energy resources and load center are the inevitable choice of contrary distribution, and extra high voltage line fed distance is long, and its corridor institute is through area
With a varied topography, meteorological condition is changeable, easily occurs serious icing the accidents such as the broken string of falling tower occur.Extra high voltage line transmission capacity
Greatly, supply district wide, reliability requirement is the highest, icing broken string that falls tower once occurs, easily causes bulk power grid off-the-line, cause greatly
Area has a power failure, and constitutes a serious threat national economy and people's productive life.UHV transmission line carries as used anti-ice measure
High design ice covering thickness, it is millions of that every kilometer of investment is accomplished by increase expense, and a track investment need to increase expense tens00000000.As
Using ice-melt measure that UHV transmission line is carried out ice-melt, deicing device only needs to invest several ten million, and economic benefit is fairly obvious.
At present, electrical network power transmission and transforming equipment anti-icing mitigation National Key Laboratory has succeeded in developing the ice-melt dress of extra high voltage line
Putting, and complete every test at laboratory, performance meets ice-melt requirement.But, device is not yet applied to Practical Project, as answered
For reality, the problem of most critical is how device line attachment.If using manual patch, because of extra-high line ball
Road ice melting current is big, and wiring workload is the hugest, needs 40～50 people to spend 3～4 day time, and upper circuit under ice and snow weather
There is the biggest potential safety hazard in work high above the ground, is unsatisfactory for the requirement of extra high voltage line ice-melt promptness and safety.Therefore, it is necessary to
Carry out extra high voltage line deicing device and automatically access the research of method, safely, quickly carry out ice-melt work for extra high voltage line and carry
For technical support.
Utility model content
The technical problems to be solved in the utility model:, safety low for extra high voltage line deicing device manual wiring efficiency
Property difference present situation, it is provided that extra high voltage line deicing device can be automatically accessed and treat ice-melt extra high voltage line by one, it is possible to significantly carry
The ice-melt efficiency of high extra high voltage line, saves a large amount of personnel, simplifies execute-in-place, saves a large amount of ice-melt time, ensures simultaneously and melts
The safety of match-maker person, safely, quickly carries out extra high voltage line ice-melt work, thus ensures the spy of extra high voltage line power supply reliability
High-tension line ice melting system.
In order to solve above-mentioned technical problem, the technical solution adopted in the utility model is:
This utility model provides a kind of extra high voltage line ice melting system, including extra high voltage line deicing device, two turn three cut
Changing device, three-phase bus, the first ground wire deicing access device, the second ground wire deicing access device, wire ice-melt access device, lead
Line ice-melt short-circuiting means and ground wire deicing short-circuiting means, two inputs of described two turn of three switching device and extra high voltage line melt
The outfan of ice production apparatus is connected, three outfans of described two turn of three switching device respectively with the phase bus phase in three-phase bus
Even, each of described three-phase bus is respectively connected with treat ice-melt extra high voltage line by wire ice-melt access device the most respectively, and
The A phase of described three-phase bus is passed through the first ground wire deicing access device, is treated that the first ground wire of ice-melt extra high voltage line and ground wire melt
Ice short-circuiting means is connected, the C phase of described three-phase bus by the second ground wire deicing access device, treat the of ice-melt extra high voltage line
Two ground wires are connected with ground wire deicing short-circuiting means, described ground wire deicing short-circuiting means also with treat that the single-phase of ice-melt extra high voltage line is led
Line is connected.
Preferably, described extra high voltage line deicing device, two turn of three switching device, the first ground wire deicing access device,
It is all provided with on two ground wire deicing access devices, wire ice-melt access device, wire ice-melt short-circuiting means and ground wire deicing short-circuiting means
Having for controlling self input and the fling-cut switch of excision state, each phase output terminal of described two turn of three switching device is provided with use
In the output polarity switching switch controlling output positive-negative polarity.
The advantage of this utility model extra high voltage line ice melting system is as follows: this utility model includes that extra high voltage line ice-melt fills
Put, two turn of three switching device, three-phase bus, the first ground wire deicing access device, the second ground wire deicing access device, wire ice-melt
Access device, wire ice-melt short-circuiting means and ground wire deicing short-circuiting means, can automatically access extra high voltage line deicing device and treat
Ice-melt extra high voltage line, is connected by each access device and short-circuiting means and treats ice-melt extra high voltage line, can realize treating melting
The automatic defrosting of ice extra high voltage line, ice-melt work efficiency is high, it is not necessary to artificial upper tower wiring, saves a large amount of personnel, saves a large amount of
The ice-melt time, ensure the safety of ice-melt personnel simultaneously, can safely, quickly carry out extra high voltage line ice-melt work, thus ensure spy
High-tension line power supply reliability.
Accompanying drawing explanation
Fig. 1 is the extra high voltage line ice melting system structural representation of this utility model embodiment one.
Marginal data: 1, extra high voltage line deicing device；2, two turn of three switching device；3, three-phase bus；4, the first ground wire
Ice-melt access device；5, the second ground wire deicing access device；6, wire ice-melt access device；7, wire ice-melt short-circuiting means；8、
Ground wire deicing short-circuiting means.
Detailed description of the invention
Embodiment one:
As it is shown in figure 1, the extra high voltage line ice melting system of the present embodiment includes extra high voltage line deicing device 1, two turn three
Switching device 2, three-phase bus the 3, first ground wire deicing access device the 4, second ground wire deicing access device 5, wire ice-melt access
Device 6, wire ice-melt short-circuiting means 7 and ground wire deicing short-circuiting means 8, two inputs of two turn of three switching device 2 and extra-high
The outfan of line ball road deicing device 1 is connected, three outfans of two turn of three switching device 2 respectively with the phase in three-phase bus 3
Bus is connected, and each of three-phase bus 3 passes through wire ice-melt access device 6 the most respectively and treat each phase phase of ice-melt extra high voltage line
Connect, and the A phase of three-phase bus 3 is by the first ground wire deicing access device 4, the first ground wire treating ice-melt extra high voltage line and ground wire
Ice-melt short-circuiting means 8 is connected, and the C phase of three-phase bus 3 is passed through the second ground wire deicing access device 5, treated ice-melt extra high voltage line
Second ground wire is connected with ground wire deicing short-circuiting means 8, ground wire deicing short-circuiting means 8 also with treat that the single-phase of ice-melt extra high voltage line is led
Line is connected.
In the present embodiment, ground wire deicing short-circuiting means 8 is connected, in addition with the B phase conductor treating ice-melt extra high voltage line, it is possible to
To select to be connected with the A phase treating ice-melt extra high voltage line or C phase conductor, the two of correspondence are in series ice-melt mode and two and a string
The connected mode of ice-melt mode is also required to carry out the adjustment of correspondence, and its principle is identical with the present embodiment, therefore the most superfluous at this
State.
In the present embodiment, 1, two turn of three switching device the 2, first ground wire deicing access device 4 of extra high voltage line deicing device,
Second ground wire deicing access device 5, wire ice-melt access device 6, wire ice-melt short-circuiting means 7 and ground wire deicing short-circuiting means 8
On be equipped with for control self put into and excision state fling-cut switch, each phase output terminal of two turn of three switching device 2 sets
There are the output polarity switching switch for controlling to export positive-negative polarity, therefore extra high voltage line deicing device 1, two turn three switching dress
Put 2, first ground wire deicing access device the 4, second ground wire deicing access device 5, wire ice-melt access device 6, wire ice-melt short
The operation of road device 7 and ground wire deicing short-circuiting means 8 is shift knob operation, simple to operation, quickness and high efficiency.
The present embodiment treats that ice-melt extra high voltage line is extra-high voltage length south line, hereafter will be so that extra-high voltage length south line be carried out
As a example by ice-melt, the automatic ice melting method of the present embodiment extra high voltage line ice melting system is further described.
The automatic ice melting method of the present embodiment extra high voltage line ice melting system, step includes:
1) three-phase conducting wire, the power supply of ground wire of extra-high voltage length south line being pulled open, the ground wire of extra-high voltage length south line includes first
Ground wire and the second ground wire, thus by the line power-off of extra-high voltage length south；
2) excision 1, two turn of three switching device the 2, first ground wire deicing access device 4, second of extra high voltage line deicing device
Ground wire deicing access device 5, wire ice-melt access device 6 and ground wire deicing short-circuiting means 8, put into wire ice-melt short-circuiting means 7
A, B, C three-phase conducting wire short circuit by extra-high voltage length south line；In the present embodiment, wire ice-melt short-circuiting means 7 is specifically at distance main deformation
Wire ice-melt short-circuiting means 7 is put into, by wire A, B, C three-phase short circuit of extra-high voltage length south line at the 100km of power station；
3) put into wire ice-melt access device 6, A, B, C three-phase conducting wire of extra-high voltage length south line is accessed three-phase bus 3；
4) selecting the wire ice-melt mode of extra-high voltage length south line, wire ice-melt mode includes that two are in series ice-melt mode and two
And a string ice-melt mode；The present embodiment specifically chosen two is in series ice-melt mode；
5) the output voltage positive-negative polarity of three outfans of two turn of three switching device 2 is controlled according to wire ice-melt mode；
6) extra high voltage line deicing device 1, A, B, C three-phase conducting wire ice-melt to extra-high voltage length south line are put into；
7) excision 1, two turn of three switching device 2 of extra high voltage line deicing device, wire ice-melt access device 6, wire ice-melt
Short-circuiting means 7, determines the ground wire short circuit mode of two ground wires, ground wire short circuit mode include the series connection of two ground wires short circuit mode and
The short circuit mode of single ground wire series connection B phase conductor；
8) control ground wire deicing short-circuiting means 8 according to the ground wire short circuit mode determined the ground wire of extra-high voltage length south line is connect
Ground；
9) according to ground wire short circuit mode, ground wire accessed three-phase bus 3；
10) the output voltage positive-negative polarity of three outfans of two turn of three switching device 2 is controlled according to ground wire short circuit mode；
11) put into extra high voltage line deicing device 1, the output voltage of extra high voltage line deicing device 1 is automatically accessed spy
The ground wire of high pressure length south line realizes the ice-melt of the ground wire to extra-high voltage length south line；
12) after ice-melt completes, 1, two turn of three switching device the 2, first ground wire deicing of extra high voltage line deicing device is excised
Access device the 4, second ground wire deicing access device 5, wire ice-melt access device 6, wire ice-melt short-circuiting means 7 and ground wire deicing
Short-circuiting means 8, exits ice-melt；
13) respectively three-phase conducting wire, the power supply of ground wire of extra-high voltage length south line are closed, recover the normal of extra-high voltage length south line
Power supply.
In the present embodiment, step 4) detailed step include: according to the three-phase conducting wire single-phase transmission line of extra-high voltage length south line
The resistance that resistance calculations two is in series, two resistance being in series are the twice of the resistance of single-phase transmission line, by extra high voltage line ice-melt
The output end voltage of device 1 obtains ice melting current divided by two resistance being in series, if ice melting current is more than or equal to extra-high voltage
The minimum ice melting current of the three-phase conducting wire of long south line, the most preferentially uses two to be in series ice-melt mode；Otherwise, if ice melting current is little
In the minimum ice melting current of the three-phase conducting wire of extra-high voltage length south line, then employing two a string ice-melt mode.Will in the present embodiment
The ice melting current that the output end voltage of extra high voltage line deicing device 1 obtains divided by two resistance being in series is 10050A, is more than
The minimum ice melting current 8000A of long south line wire, therefore uses two to be in series ice-melt mode.
In the present embodiment, step 5) detailed step include: judge the type of wire ice-melt mode, if wire ice-melt mould
Formula is two to be in series ice-melt mode, then the output voltage of the A phase output terminal controlling two turn of three switching device 2 is that positive polarity, C phase are defeated
The output voltage going out end is negative polarity；If wire ice-melt mode is two and a string ice-melt mode, then control two turn of three switching
The output voltage of the B phase output terminal of device 2 be positive polarity, the output voltage of A phase output terminal be negative polarity, C phase output terminal
Output voltage is negative polarity.In the present embodiment, wire ice-melt mode is two to be in series ice-melt mode, therefore controls two turn of three switching
The output voltage of the A phase output terminal of device 2 be positive polarity (" " pole tension), the output voltage of C phase output terminal be negative polarity (" "
Pole tension).
In the present embodiment, step 7) in determine that the detailed step of ground wire short circuit mode includes: according to extra-high voltage length south line
The resistance of two ground wire series connection of the resistance calculations of single ground wire, the two of the resistance that resistance is single ground wire of two ground wire series connection
Times, the resistance that the output end voltage of extra high voltage line deicing device 1 is connected divided by two ground wires is obtained ice melting current, if melted
Ice electric current, more than or equal to the minimum ice melting current of the single ground wire of extra-high voltage length south line, the most preferentially uses two ground wire series connection
Short circuit mode；Otherwise, if ice melting current is less than the minimum ice melting current of the single ground wire of extra-high voltage length south line, then use single
The short circuit mode of ground wire series connection B phase conductor.In the present embodiment, by the output end voltage of extra high voltage line deicing device 1 divided by two
The ice melting current that the resistance of root ground wire series connection obtains is 520A, and more than the minimum ice melting current 400A of long south line ground wire, ground wire is adopted
Short circuit mode with two ground wire series connection.
In the present embodiment, step 8) in control two by ground wire deicing short-circuiting means 8 according to the ground wire short circuit mode determined
When root is ground wire grounded, if it is determined that the short circuit mode that ground wire short circuit mode is the series connection of two ground wires, then by two ground wires
First ground wire and the second ground wire access ground wire deicing short-circuiting means 8 and realize short circuit；If it is determined that ground wire short circuit mode be single
The short circuit mode of ground wire series connection B phase conductor, then access ground wire deicing short circuit by the first ground wire in two ground wires or the second ground wire
Device 8 realizes short circuit.In the present embodiment, ground wire uses the short circuit mode of two ground wire series connection, therefore in distance main deformation power station
Utilize ground wire deicing short-circuiting means 8 that first ground wire and the second ground wire are accessed this device at 100km and realize short circuit.
In the present embodiment, step 9) when ground wire being accessed three-phase bus 3 according to ground wire short circuit mode, if ground wire short circuit side
Formula is the short circuit mode of two ground wire series connection, then put into the first ground wire deicing access device 4 and the second ground wire deicing access device
5；If the short circuit mode that ground wire short circuit mode is single ground wire series connection B phase conductor, put into when being the first ground wire when selecting ground wire
First ground wire deicing access device 4 and wire ice-melt access device 6, melt when selecting ground wire to put into the second ground wire when being the second ground wire
Ice access device 5 and wire ice-melt access device 6.In the present embodiment, ground wire uses the short circuit mode of two ground wire series connection, therefore
Put into the first ground wire deicing access device 4 and the second ground wire deicing access device 5, ground wire is accessed three-phase bus 3.
In the present embodiment, step 10) detailed step include: judge the type of ground wire short circuit mode, if it is determined that ground
Line short circuit mode is the short circuit mode of two ground wire series connection, then control the output voltage of the A phase output terminal of two turn of three switching device 2
Output voltage for positive polarity, C phase output terminal is negative polarity；If ground wire short circuit mode is single ground wire series connection B phase conductor
Short circuit mode, when the output voltage of the A phase output terminal selecting ground wire then to control two turn of three switching device 2 when being the first ground wire is just
Polarity, the output voltage of B phase output terminal are negative polarity, then control two turn of three switching device 2 when selecting ground wire when being the second ground wire
The output voltage of B phase output terminal be positive polarity, the output voltage of B phase output terminal be negative polarity.In the present embodiment, ground wire uses
The short circuit mode of two ground wire series connection, therefore Changzhi transformer station utilizes two turn of three switching device 2 that A phase is exported " " pole tension, C
Output " " pole tension mutually.
In sum, extra high voltage line ice melting system and the de-icing method thereof of the present embodiment has following beneficial effect: 1,
Can be automatically accessed by extra high voltage line deicing device 1 and treat ice-melt extra high voltage line, ice-melt work efficiency is high；2, all access fills
Put, switching device, short-circuiting means all can use push-botton operation, simple to operation；3, without artificial upper tower wiring, save a large amount of
Personnel, save a large amount of ice-melt time, ensure the safety of ice-melt personnel simultaneously；4, extra high voltage line ice-melt can safely, be quickly carried out
Work, thus ensure extra high voltage line power supply reliability.
Embodiment two:
The extra high voltage line ice melting system of the present embodiment is identical with embodiment one, treats that ice-melt is extra-high in the present embodiment
Line ball road is extra-high voltage all banyan lines, hereafter will be as a example by extra-high voltage, all banyan line carries out ice-melt, to the present embodiment extra high voltage line
The automatic ice melting method of ice melting system is further described.
The automatic ice melting method of the present embodiment extra high voltage line ice melting system, step includes:
1) extra-high voltage all three-phase conducting wires of banyan line, the power supply of ground wire being pulled open, the ground wire of extra-high voltage all banyan lines includes first
Ground wire and the second ground wire, thus by extra-high voltage all banyan line power-off；
2) excision 1, two turn of three switching device the 2, first ground wire deicing access device 4, second of extra high voltage line deicing device
Ground wire deicing access device 5, wire ice-melt access device 6 and ground wire deicing short-circuiting means 8, at Rong Cheng transformer station 180km
Put into wire ice-melt short-circuiting means 7 by A, B, C three-phase conducting wire short circuit of extra-high voltage all banyan lines；In the present embodiment, wire ice-melt is short
Road device 7 specifically at distance main deformation power station 100km put into wire ice-melt short-circuiting means 7, by the wire A of extra-high voltage all banyan lines,
B, C three-phase short circuit；
3) put into wire ice-melt access device 6, A, B, C three-phase conducting wire of extra-high voltage all banyan lines is accessed three-phase bus 3；
4) selecting the wire ice-melt mode of extra-high voltage all banyan lines, wire ice-melt mode includes that two are in series ice-melt mode and two
And a string ice-melt mode；The present embodiment specifically chosen two is in series ice-melt mode；In the present embodiment, by extra-high in the present embodiment
The output end voltage of line ball road deicing device 1 is 9500A divided by the ice melting current that two resistance being in series obtain, less than all banyan lines
The minimum ice melting current 10000A of wire, wire employing two a string ice-melt mode；
5) the output voltage positive-negative polarity of three outfans of two turn of three switching device 2 is controlled according to wire ice-melt mode；
Wire employing two a string ice-melt mode in the present embodiment, hence with two turn of three switching device 2 of Rong Cheng transformer station by defeated for B phase
Going out " " pole tension, A, C phase exports " " pole tension；
6) extra high voltage line deicing device 1, A, B, C three-phase conducting wire ice-melt to extra-high voltage all banyan lines are put into；
7) excision 1, two turn of three switching device 2 of extra high voltage line deicing device, wire ice-melt access device 6, wire ice-melt
Short-circuiting means 7, determines the ground wire short circuit mode of two ground wires, ground wire short circuit mode include the series connection of two ground wires short circuit mode and
The short circuit mode of single ground wire series connection B phase conductor；In the present embodiment, the output end voltage of extra high voltage line deicing device 1 is removed
The ice melting current obtained with the resistance of two ground wires series connection is as 320A, less than the minimum ice melting current 450A of all banyan line ground wires, ground
Line uses the short circuit mode of single ground wire series connection B phase conductor；
8) control ground wire deicing short-circuiting means 8 according to the ground wire short circuit mode determined the ground wire of extra-high voltage all banyan lines is connect
Ground；In the present embodiment, specifically utilizing ground wire deicing short-circuiting means 8 by the first ground wire or at Rong Cheng transformer station 180km
Two ground wires and B phase conductor access this device and realize short circuit；
9) according to ground wire short circuit mode, ground wire accessed three-phase bus 3；In the present embodiment, ground wire uses the series connection of single ground wire
The short circuit mode of B phase conductor, therefore puts into the first ground wire deicing access device 4 and wire ice-melt access device 6, is accessed by ground wire
Three-phase bus 3；
10) the output voltage positive-negative polarity of three outfans of two turn of three switching device 2 is controlled according to ground wire short circuit mode；
In the present embodiment, ground wire uses the short circuit mode of single ground wire series connection B phase conductor, hence with two turn of three switching device 2 by A phase
Output " " pole tension, B phase exports " " pole tension；
11) put into extra high voltage line deicing device 1, the output voltage of extra high voltage line deicing device 1 is automatically accessed spy
The ground wire of high pressure all banyan lines realizes the ice-melt to extra-high voltage all ground wires of banyan line；
12) after ice-melt completes, 1, two turn of three switching device the 2, first ground wire deicing of extra high voltage line deicing device is excised
Access device the 4, second ground wire deicing access device 5, wire ice-melt access device 6, wire ice-melt short-circuiting means 7 and ground wire deicing
Short-circuiting means 8, exits ice-melt；In the present embodiment, Rong Cheng transformer station excision extra high voltage line deicing device 1, two turn three switching dress
Put the 2, first ground wire deicing access device 4, wire ice-melt access device 6, exit deicing device, away from Rong Cheng transformer station 180km
Place's excision ground wire deicing short-circuiting means 8；
13) respectively extra-high voltage all three-phase conducting wires of banyan line, the power supply of ground wire are closed, recover the normal of extra-high voltage all banyan lines
Power supply.
The above is only preferred implementation of the present utility model, and protection domain of the present utility model is not limited merely to
Above-described embodiment, all technical schemes belonged under this utility model thinking belong to protection domain of the present utility model.Should refer to
Go out, for those skilled in the art, without departing from the some improvement under this utility model principle premise and
Retouching, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (2)
1. an extra high voltage line ice melting system, it is characterised in that: include extra high voltage line deicing device (1), two turn of three switching
Device (2), three-phase bus (3), the first ground wire deicing access device (4), the second ground wire deicing access device (5), wire ice-melt
Access device (6), wire ice-melt short-circuiting means (7) and ground wire deicing short-circuiting means (8), described two turn of three switching device (2)
Two inputs are connected with the outfan of extra high voltage line deicing device (1), three outputs of described two turn of three switching device (2)
End is respectively connected with the phase bus in three-phase bus (3), and each of described three-phase bus (3) accesses dress by wire ice-melt the most respectively
Put (6) and be respectively connected with treat ice-melt extra high voltage line, and the A phase of described three-phase bus (3) is accessed by the first ground wire deicing
Device (4), treat that the first ground wire of ice-melt extra high voltage line is connected with ground wire deicing short-circuiting means (8), described three-phase bus (3)
C phase is by the second ground wire deicing access device (5), the second ground wire treating ice-melt extra high voltage line and ground wire deicing short-circuiting means
(8) being connected, described ground wire deicing short-circuiting means (8) is also connected with the single-phase transmission line treating ice-melt extra high voltage line.
Extra high voltage line ice melting system the most according to claim 1, it is characterised in that: described extra high voltage line deicing device
(1), two turn of three switching device (2), the first ground wire deicing access device (4), the second ground wire deicing access device (5), wire melt
It is equipped with on ice access device (6), wire ice-melt short-circuiting means (7) and ground wire deicing short-circuiting means (8) for controlling self throwing
Entering and excise the fling-cut switch of state, each phase output terminal of described two turn of three switching device (2) is provided with and just exports for controlling
The output polarity switching switch of negative polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620786830.6U CN205863868U (en) | 2016-07-25 | 2016-07-25 | A kind of extra high voltage line ice melting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620786830.6U CN205863868U (en) | 2016-07-25 | 2016-07-25 | A kind of extra high voltage line ice melting system |
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| CN205863868U true CN205863868U (en) | 2017-01-04 |
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| CN201620786830.6U Expired - Fee Related CN205863868U (en) | 2016-07-25 | 2016-07-25 | A kind of extra high voltage line ice melting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058777A (en) * | 2016-07-25 | 2016-10-26 | 国网湖南省电力公司 | Uhv transmission line ice-melting system and automatic ice-melting method thereof |
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2016
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058777A (en) * | 2016-07-25 | 2016-10-26 | 国网湖南省电力公司 | Uhv transmission line ice-melting system and automatic ice-melting method thereof |
| CN106058777B (en) * | 2016-07-25 | 2017-10-03 | 国网湖南省电力公司 | A kind of extra high voltage line ice melting system and its automatic ice melting method |
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