CN106384989B - A kind of pair of power transmission line overhead ground wire carries out the device and method of DC ice melting - Google Patents
A kind of pair of power transmission line overhead ground wire carries out the device and method of DC ice melting Download PDFInfo
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- CN106384989B CN106384989B CN201611015295.5A CN201611015295A CN106384989B CN 106384989 B CN106384989 B CN 106384989B CN 201611015295 A CN201611015295 A CN 201611015295A CN 106384989 B CN106384989 B CN 106384989B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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Abstract
A kind of pair of power transmission line overhead ground wire carries out the device of DC ice melting, including N number of segmentation tower, aerial earth wire, three-phase ac power supply, DC de-icing device, the first conducting wire, the second conducting wire, segmentation ground wire, grounding switch KG, automatic connection device KN；The aerial earth wire insulation against ground is simultaneously segmented through multiple grounding switch KG ground connection, first conducting wire or the second conducting wire and aerial earth wire are shorted by each segmentation tower by automatic connection device KN, minimum one section of segmentation ground wire or the minimum one section of segmentation ground wire of series connection in parallel, the automatic connection device KN pass through signal control opening and closing at each short circuit.Advantage is that ground wire deicing line short circuit time and short-circuit device expense can be made to reduce 1 times or more, and ice-melt segmentation selection flexibility greatly improves, and avoids needing the disconnection and connecting to optical cable in OPGW ground wire for ice-melt, reduces line upkeep cost.
Description
Technical field
The present invention relates to a kind of power transmission line overhead ground wire DC ice melting technical field, particularly a kind of pair of transmission line of electricity
The device and method of aerial earth wire progress DC ice melting.
Background technique
In recent years, because the low temperature sleet and snow ice of large area occurs again and again in southern region of China winter caused by climate change
Disaster causes influence very serious to the normal operation of power grid.Broken string, short circuit caused by transmission pressure icing fall tower very
Long to accidents repair times such as system sectionalizings, labor intensive is big.Wherein, the tightest with the icing situation of aerial earth wire in power grid
Weight.Therefore, the anti-ice technology of aerial earth wire is receive more and more attention.
Currently, DC ice melting mainly carries out ice-melt to AC transmission wire, because power transmission line overhead ground wire passes through shaft tower
Ground connection needs to take the technological transformation of insulation against ground to ground wire deicing, considers that ground wire Insulation Transformation economy and shocking preventing technology are wanted
It asks, ground wire insulation is generally designed by 35kV voltage class, and aerial earth wire Insulation Transformation includes that ground wire insulation against ground and segmentation connect
Deng costly；The D.C. resistance of ground wire is larger, is limited by DC de-icing device output voltage and ground wire insulation, and ground wire needs
It is segmented ice-melt, 4 sections or more will be usually divided into long range ultrahigh-voltage alternating-current power transmission line overhead ground wire, to super high voltage direct current electricity transmission
Fixed track usage plan ground wire will usually be divided into 9 sections or more.Each aerial earth wire waypoint in the ice-melt access circuit of existing aerial earth wire
Physical insulation isolation is carried out using sectionaliser, needing to install fiber optic closure to OPGW ground wire ensures that signal is unimpeded, each segmentation
Point is equipped with two sets in the big small size side of shaft tower and is manually shorted with wire clamp is collaborated, and the tower position of waypoint is fixed.More than being based on
Scheme, ground wire need to disconnect in waypoint, and reforming equipment is more, costly, and ground wire Insulation Test is difficult；When multistage ice-melt simultaneously,
Each segmentation need to operate two fitting streamlines folder, and the ground wire access operation time is long；Waypoint tower position is fixed, and ice-melt segmentation access is ineffective
It is living；OPGW fibre junction, increases fibre loss, increases maintenance cost；Collaborating wire clamp can only be by manually on cross arm of tower
Operation is completed, and operating time length, security risk are big.
Summary of the invention
The purpose of the invention is to overcome, there are ground wire insulation and segmentation improvement expenses height, ice-melt in existing ground wire deicing
The defects of operating time is long, the invention proposes the device and method that a kind of pair of power transmission line overhead ground wire carries out DC ice melting,
Specific technical solution is as follows：
A kind of pair of power transmission line overhead ground wire carries out the device of DC ice melting, including N number of segmentation tower, aerial earth wire, exchange
Three phase mains, DC de-icing device, the first conducting wire, the second conducting wire, segmentation ground wire, grounding switch KG, automatic connection device KN；Institute
The N number of segmentation tower stated be followed successively by segmentation tower 1, segmentation tower 2, segmentation tower 3 ..., segmentation tower N, first conducting wire, second are led
Line is isolated with power grid and insulation against ground, and first conducting wire is shorted point on the segmentation tower of odd number, and second conducting wire is short
On the segmentation tower of even number, the aerial earth wire insulation against ground is simultaneously segmented by multiple grounding switch KG ground connection, each contact
First conducting wire or the second conducting wire and aerial earth wire are shorted by the segmentation tower by automatic connection device KN, at each short circuit simultaneously
Join minimum one section of segmentation ground wire or the minimum one section of segmentation ground wire of series connection, the automatic connection device KN are opened by signal control
It closing, three-phase ac power supply is connect with DC de-icing device, the output cathode connection of first conducting wire and DC de-icing device,
The output negative pole of second conducting wire and DC de-icing device connects；The DC de-icing device and the first conducting wire, second
The access point of conducting wire is equipped with access disconnecting link K.
Insulation against ground transformation is implemented to aerial earth wire, access disconnecting link K and automatic connection device KN is opened when the non-ice age, is full
Sufficient lightning protection requires to be grounded aerial earth wire by closing grounding switch KG, and when ice age, which opens aerial earth wire grounding switch, makes aerial ground
The insulation against ground of line all fronts is shorted aerial earth wire by automatic connection device KN in ground wire waypoint when ice-melt and leads with corresponding one
Line (the first conducting wire or the second conducting wire), makes ice-melt sectional parallel on the first conducting wire and the second conducting wire；Ice-melt dress is operated when ice-melt
It sets output DC current and each segmentation aerial earth wire is accessed by conducting wire, suitable DC current is injected to ground wire, ground wire fever is melted
Change icing.
As the improvement of scheme one, three-phase ac power supply is 35kV or 10kV station electricity consumption.
As the improvement of scheme one, the adjustable extent of the stable DC electric current of DC de-icing device is 100-4500A.
As the improvement of scheme one, between the segmentation ground wire or aerial earth wire the first conducting wire of access and the second conducting wire etc.
Effect DC resistance is R, and the range of equivalent d.c. resistance is 1-90 Ω, ice melting current range is 100-600A.
Each section of line resistance value of sectional parallel access is matched with its ice melting current required value, makes the ice melting current of each segmentation
Between its minimum ice melting current and maximum ice melting current, and meet the ice melting current of each segmentation and the product of its resistance value is basic
Equal, deviation is no more than 10%
As the improvement of scheme one, grounding switch KG is the 35kV class of insulation.
As the improvement of scheme one, automatic connection device KN has two kinds of switching positions, when ice-melt it is in the close position will
Aerial earth wire is connect with the first conducting wire or the second conducting wire, and open position is in when route operates normally by aerial earth wire and grounding point
Connection.
The method that a kind of pair of power transmission line overhead ground wire carries out DC ice melting, includes the following steps：
S1 it) operates and confirms that the first conducting wire, the second conducting wire and aerial earth wire are isolated with power grid, open whole grounding switchs
KG makes the insulation against ground of aerial earth wire all fronts；
S2) the automatic connection device KN that closure needs ice-melt to be segmented is shorted the first conducting wire, the second conducting wire and aerial earth wire；
S3) closure deicing device accesses disconnecting link K, and starting DC de-icing device exports minimum ice melting current, according to live feelings
Condition gradually increases DC current within the scope of minimum ice melting current and maximum ice melting current, until icing thawing falls off, stops straight
Deicing device output is flowed, and disconnects access disconnecting link K, the first conducting wire, the second conducting wire is isolated with DC de-icing device.
S4 whole automatic connection device KN) are disconnected, the first conducting wire, the second conducting wire is isolated with aerial earth wire；Close ground connection
Disconnecting link KG keeps each segmentation aerial earth wire at least one point earth, route is made to have telegram in reply condition.
The present invention has beneficial effect below：Ground wire deicing line short circuit time and short-circuit device expense can be made to reduce
1 times or more, ice-melt segmentation selection flexibility greatly improves, and avoids being needed for ice-melt to the disconnection of optical cable in OPGW ground wire and being connect
It is continuous, reduce line upkeep cost.
Detailed description of the invention
Fig. 1 is the working principle diagram of the device that DC ice melting is carried out to power transmission line overhead ground wire of embodiment 1.
Fig. 2 is the working principle diagram of the device that DC ice melting is carried out to power transmission line overhead ground wire of embodiment 2.
Specific embodiment
Embodiment 1
As shown in Figure 1, a kind of pair of power transmission line overhead ground wire carries out the device of DC ice melting, including it is 5 segmentation towers, aerial
Ground wire, three-phase ac power supply, DC de-icing device, the first conducting wire, the second conducting wire, segmentation ground wire, grounding switch KG, automatic connection
Device KN；5 segmentation towers are followed successively by segmentation tower 1, segmentation tower 2... segmentation tower 5, first conducting wire, the second conducting wire
It is isolated with power grid and insulation against ground, first conducting wire is shorted point on the segmentation tower of even number, second conducting wire is shorted
On the segmentation tower of odd number, the aerial earth wire insulation against ground is simultaneously segmented through multiple grounding switch KG ground connection, Mei Gesuo point
First conducting wire or the second conducting wire and aerial earth wire are shorted by the segmentation tower stated by automatic connection device KN, in parallel at each short circuit
Two sections of segmentation ground wires access four sections of ground wires altogether, and the automatic connection device KN is controlled by signal and is opened and closed, three-phase ac power supply
It is connect with DC de-icing device, the output cathode connection of first conducting wire and DC de-icing device, second conducting wire
It is connect with the output negative pole of DC de-icing device；The access point of the DC de-icing device and the first conducting wire, the second conducting wire is equal
Equipped with access disconnecting link K.Three-phase ac power supply is 35kV or 10kV station electricity consumption.The stable DC electric current of DC de-icing device it is adjustable
Range is 100-4500A.The segmentation ground wire or aerial earth wire access the Equivalent DC electricity between the first conducting wire and the second conducting wire
Resistance value is R, and the range of equivalent d.c. resistance is 1-90 Ω, ice melting current range is 100-600A.Each section of sectional parallel access
Line resistance value is matched with its ice melting current required value, makes the ice melting current of each segmentation in its minimum ice melting current and maximum ice-melt
Between electric current, and meet the ice melting current of each segmentation and the product of its resistance value is of substantially equal, deviation is no more than 10%.Earthing
Lock KG is the 35kV class of insulation.Automatic connection device KN has two kinds of switching positions, when ice-melt it is in the close position will aerially
Line is connect with the first conducting wire or the second conducting wire, connect aerial earth wire with grounding point in open position when route operates normally.
Embodiment 2
As shown in Fig. 2, unlike the first embodiment, for being segmented the shorter particular segment (generally less than 10km) of tower distance,
It is accessed between the first conducting wire and the second conducting wire by parallel after the series connection of segmentation aerial earth wire two sides.
Embodiment 3
The method that a kind of pair of power transmission line overhead ground wire carries out DC ice melting, includes the following steps：
S1 it) operates and confirms that the first conducting wire, the second conducting wire and aerial earth wire are isolated with power grid, open whole grounding switchs
KG makes the insulation against ground of aerial earth wire all fronts；
S2) the automatic connection device KN that closure needs ice-melt to be segmented is shorted the first conducting wire, the second conducting wire and aerial earth wire；
S3) closure deicing device accesses disconnecting link K, and starting DC de-icing device exports minimum ice melting current, according to live feelings
Condition gradually increases DC current within the scope of minimum ice melting current and maximum ice melting current, until icing thawing falls off, stops straight
Deicing device output is flowed, and disconnects access disconnecting link K, the first conducting wire, the second conducting wire is isolated with DC de-icing device.
S4 whole automatic connection device KN) are disconnected, the first conducting wire, the second conducting wire is isolated with aerial earth wire；Close ground connection
Disconnecting link KG keeps each segmentation aerial earth wire at least one point earth, route is made to have telegram in reply condition.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and the embodiment is not to limit this hair
Bright the scope of the patents, all equivalence enforcements or change without departing from carried out by the present invention, is intended to be limited solely by the scope of the patents of this case.
Claims (7)
1. a kind of pair of power transmission line overhead ground wire carries out the device of DC ice melting, including N number of segmentation tower, aerial earth wire, the N
A segmentation tower be followed successively by segmentation tower 1, segmentation tower 2, segmentation tower 3 ..., segmentation tower N, which is characterized in that further include AC three-phase
Source, DC de-icing device, the first conducting wire, the second conducting wire, segmentation ground wire, grounding switch KG, automatic connection device KN；Described
One conducting wire, the second conducting wire is isolated with power grid and insulation against ground, and the first conducting wire ice-melt is shorted point on the segmentation tower of odd number,
The second conducting wire ice-melt is shorted point on the segmentation tower of even number, and the aerial earth wire insulation against ground is simultaneously segmented by multiple
Grounding switch KG ground connection, each segmentation tower pass through automatic connection device KN for the first conducting wire or the second conducting wire and aerial ground
Line is shorted, minimum one section of segmentation ground wire or the minimum one section of segmentation ground wire of series connection in parallel, the automatic connection dress at each short circuit
It sets KN and opening and closing is controlled by signal, three-phase ac power supply is connect with DC de-icing device, first conducting wire and DC ice melting
The output cathode of device connects, and the output negative pole of second conducting wire and DC de-icing device connects；The DC ice melting
The access point of device and the first conducting wire, the second conducting wire is equipped with access disconnecting link K.
2. the device that a kind of pair of power transmission line overhead ground wire according to claim 1 carries out DC ice melting, which is characterized in that
The three-phase ac power supply is 35kV or 10kV station electricity consumption.
3. the device that a kind of pair of power transmission line overhead ground wire according to claim 1 carries out DC ice melting, which is characterized in that
The adjustable extent of the stable DC electric current of the DC de-icing device is 100-4500A.
4. the device that a kind of pair of power transmission line overhead ground wire according to claim 1 carries out DC ice melting, which is characterized in that
The equivalent d.c. resistance value that the segmentation ground wire or aerial earth wire access between the first conducting wire and the second conducting wire is R, Equivalent DC
The range of resistance is 1-90 Ω, ice melting current range is 100-600A.
5. the device that a kind of pair of power transmission line overhead ground wire according to claim 1 carries out DC ice melting, which is characterized in that
The grounding switch KG is the 35kV class of insulation.
6. the device that a kind of pair of power transmission line overhead ground wire according to claim 1 carries out DC ice melting, which is characterized in that
The automatic connection device KN has two kinds of switching positions, when ice-melt it is in the close position by aerial earth wire and the first conducting wire or
Aerial earth wire, connect by the connection of the second conducting wire when route operates normally in open position with grounding point.
7. a kind of side for carrying out DC ice melting to power transmission line overhead ground wire based on device as claimed in any one of claims 1 to 6
Method, which is characterized in that include the following steps：
S1 it) operates and confirms that the first conducting wire, the second conducting wire and aerial earth wire are isolated with power grid, open whole grounding switch KG, make
The insulation against ground of aerial earth wire all fronts；
S2) the automatic connection device KN that closure needs ice-melt to be segmented is shorted the first conducting wire, the second conducting wire and aerial earth wire；
S3) closure DC de-icing device accesses disconnecting link K, and starting DC de-icing device exports minimum ice melting current, according to live feelings
Condition gradually increases DC current within the scope of minimum ice melting current and maximum ice melting current, until icing thawing falls off, stops straight
Deicing device output is flowed, and disconnects access disconnecting link K, the first conducting wire, the second conducting wire is isolated with DC de-icing device；
S4 whole automatic connection device KN) are disconnected, the first conducting wire, the second conducting wire is isolated with aerial earth wire；Close grounding switch
KG keeps each segmentation aerial earth wire at least one point earth, route is made to have telegram in reply condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015295.5A CN106384989B (en) | 2016-11-18 | 2016-11-18 | A kind of pair of power transmission line overhead ground wire carries out the device and method of DC ice melting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611015295.5A CN106384989B (en) | 2016-11-18 | 2016-11-18 | A kind of pair of power transmission line overhead ground wire carries out the device and method of DC ice melting |
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| CN106384989B true CN106384989B (en) | 2018-11-23 |
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| CN107215245B (en) * | 2017-05-22 | 2020-01-21 | 北京千驷驭电气有限公司 | Energy self-circulation contact net ice melting system |
| CN107215246B (en) * | 2017-05-22 | 2020-05-12 | 北京千驷驭电气有限公司 | Intelligent ice melting system of contact network |
| 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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000092673A (en) * | 1998-09-08 | 2000-03-31 | Ngk Insulators Ltd | Snow-melting device for iron tower |
| CN102856869B (en) * | 2012-08-30 | 2015-06-17 | 中国电力工程顾问集团西南电力设计院有限公司 | Wiring method for realizing direct-current deicing of ground wire of converter station |
| CN105529667A (en) * | 2016-02-23 | 2016-04-27 | 徐光武 | DC ice melting system and DC ice melting method for UHV ground wires |
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