CN106207925B - A kind of distribution network line ice melting system and its de-icing method - Google Patents
A kind of distribution network line ice melting system and its de-icing method Download PDFInfo
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- CN106207925B CN106207925B CN201610589866.XA CN201610589866A CN106207925B CN 106207925 B CN106207925 B CN 106207925B CN 201610589866 A CN201610589866 A CN 201610589866A CN 106207925 B CN106207925 B CN 106207925B
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- 238000002844 melting Methods 0.000 title claims abstract description 66
- 230000008018 melting Effects 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000004020 conductor Substances 0.000 claims description 6
- 230000008014 freezing Effects 0.000 abstract description 6
- 238000007710 freezing Methods 0.000 abstract description 6
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 6
- 239000000155 melt Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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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
-
- 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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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Abstract
The invention discloses a kind of distribution network line ice melting system and its de-icing method, system includes the fixed exchange ice-melt unit of main line, long branch line movable DC ice-melt unit and short branch line Portable DC ice-melt unit, the fixed exchange ice-melt unit of main line switchs including ice-melt, ice-melt protection device, fixed ice-melt voltage output device, long branch line movable DC ice-melt unit includes the mobile ice-melt TRT and the first ice-melt fairing being connected with each other, short branch line Portable DC ice-melt unit includes the portable ice-melt TRT and the second ice-melt fairing being connected with each other；Method includes selecting different ice-melt units to carry out exchanging ice-melt or DC ice melting according to icing situation and circuit types.The present invention is designed for main line, long branch line, short branch line, covers all line ice-meltings of power distribution network, it is possible to increase the efficiency and expansion ice-melt scope of distribution network line ice-melt, enhancing distribution network line resist a wide range of freezing rain and snow disaster ability.
Description
Technical field
The invention belongs to electrical engineering technical field, and in particular to a kind of distribution network line ice melting system and its ice-melt side
Method.
Background technology
Since 2008, a wide range of freezing rain and snow disaster in south is to the province power system such as Hunan, Guizhou, Jiangxi, Zhejiang
Heavy losses are caused, distribution network line belongs to the most terminal of sale of electricity, and widely distributed, is in mima type microrelief microclimate region, tower more
Line-outage contingency takes place frequently, and has directly influenced the reliable power supply of user.The distribution network line ice melting system of research and design, is to ensure that ice
The key of calamity period customer power supply reliability.
Research at present on power distribution network ice melting system is few, and the power distribution network deicing device of part R＆D institution research and development is main
For short-term road and ultrashort line ice-melting, ice-melt distance all in below 3km, can only be directed to distribution branch line and partly melt substantially
Ice, not yet formed and be directed to some region of ice-melt system.And distribution network line various arch types are more, small bore can only typically be led
Line implements ice-melt, and ice-melt is difficult.During a wide range of ice damage of generation, the configuration of current deicing device is still not enough to support this area to match somebody with somebody
All line ice-meltings of network system.Therefore, establish a set of distribution network line ice melting system, cover all main lines of power distribution network,
The ice-melt of long branch line, short branch line, according to the difference for needing ice-melt section, suitable de-icing method is chosen, turns into distribution network line and carries
Rise and resist urgent problem to be solved in a wide range of freezing rain and snow disaster ability.
The content of the invention
The technical problem to be solved in the present invention：For the above mentioned problem of prior art, there is provided a kind of system is directed to power distribution network
Circuit main line, long branch line, short branch line are designed, and cover the ice-melt of all circuits of power distribution network, can effectively improve distribution netting twine
The efficiency and expansion ice-melt scope of road ice-melt, enhancing distribution network line resist the distribution netting twine of a wide range of freezing rain and snow disaster ability
Road ice melting system and its de-icing method.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of de-icing method of distribution network line ice melting system, it is fixed that the distribution network line ice melting system includes main line
Exchange ice-melt unit, long branch line movable DC ice-melt unit and short branch line Portable DC ice-melt unit, the main line are fixed
For formula exchange ice-melt unit in transformer station, the fixed exchange ice-melt unit of main line includes ice-melt switch, ice-melt protection dress
Put, fixed ice-melt voltage output device, the input of the fixed ice-melt voltage output device pass sequentially through ice-melt protection device,
Ice-melt switch is connected with the 10kV buses of transformer station, and the control terminal of the ice-melt switch is connected with ice-melt protection device, the length
Branch line movable DC ice-melt unit includes the mobile ice-melt TRT and the first ice-melt fairing being connected with each other, described short
Branch line Portable DC ice-melt unit includes the portable ice-melt TRT and the second ice-melt fairing being connected with each other, step bag
Include：
1) detect distribution network line power distribution network main line icing situation, if power distribution network main line reach the first designated ratio with
Icing occurs for upper scope, then redirects and perform step 2)；Otherwise redirected when power distribution network main line part icing and perform step 3)；
If 2) power distribution network main line icing reaches default icing warning value, by small section in the power distribution network main line of icing
The output end of fixed ice-melt voltage output device is connected and by target line as target line by face wire with target line
End short circuit ground connection, open ice-melt switch and exchange ice-melt is carried out to target line；Redirect and perform step 4)；
If 3) power distribution network main line part icing reaches default icing warning value, by the power distribution network main line of local icing
In large-section lead section as target line, by the output end of the first ice-melt fairing and one end phase of target line
DC ice melting even and by the end short circuit ground connection of target line, unlatching mobile ice-melt TRT is carried out to target line；Redirect
Perform step 4)；
4) the long branch line icing situation of power distribution network of distribution network line is detected, if the long branch line of power distribution network, which reaches second, specifies ratio
Icing occurs for example range above, then redirects and perform step 5)；Otherwise execution step is redirected when the long branch line part icing of power distribution network
6)；
5) if the long branch line icing of power distribution network reaches default icing warning value, the small bore in power distribution network main line is led
Be used as target line after the series connection of the power distribution network of line and icing long branch line, by the output end of fixation ice-melt voltage output device with
Target line is connected and the end short circuit ground connection of target line, unlatching ice-melt switch is carried out into exchange ice-melt to target line；Jump
Turn to perform step 7)；
If 6) the long branch line part icing of power distribution network reaches default icing warning value, the power distribution network of local icing is grown
The output end of first ice-melt fairing is then connected and by score as target line by branch line with one end of target line
The end short circuit ground connection on road, opens mobile ice-melt TRT and carries out DC ice melting to target line；Redirect and perform step 7)；
7) icing or the fixed exchange ice-melt list of main line occur for the target line being directed between the span of distribution network line part
First and long branch line movable DC ice-melt unit can not carry out the target line of ice-melt, if target line icing reaches default
Icing warning value, then the output end of the second ice-melt fairing is connected with one end of target line and by the end of target line
Short circuit is grounded, and is opened portable ice-melt TRT and is carried out DC ice melting to target line.
Preferably, it is described be connected with one end of target line specifically refer to respectively by the every of wire connecting clip and target line
One phase conductor one end is connected.
Preferably, it is described to refer to the end short circuit ground connection of target line respectively by shorting stub by target line end
It is grounded again by grounding nail after each phase conductor is commonly connected.
Distribution network line ice melting system tool of the present invention has the advantage that：
1st, distribution network line ice melting system of the present invention includes the fixed exchange ice-melt unit of main line, long branch line movable DC
Ice-melt unit and short branch line Portable DC ice-melt unit are portable straight by the fixed exchange ice-melt unit of main line, long branch line
Stream ice-melt unit and short branch line Portable DC ice-melt unit can cover different distribution network line length simultaneously, can be achieved a certain
The ice-melt of all power distribution networks in region, drastically increase the ability that distribution network line resists a wide range of freezing rain and snow disaster.
2nd, distribution network line ice melting system of the present invention includes the fixed exchange ice-melt unit of main line, long branch line movable DC
Ice-melt unit and short branch line Portable DC ice-melt unit, take from transformer station's power taking source, vehicle power and portable power supplies
Three kinds of ways to take power, ice-melt capacity and ice-melt convenience, exploitativeness are strong when taking into account distribution line ice-melt.
3rd, distribution network line ice melting system of the present invention includes the fixed exchange ice-melt unit of main line, long branch line movable DC
Ice-melt unit and short branch line Portable DC ice-melt unit, for different line lengths, can flexibly choose alternating current-direct current ice-melt
Mode, reduce the workload of system operation maintenance, ice-melt mobility strong, ice-melt efficiency high.
4th, distribution network line ice melting system of the present invention includes the fixed exchange ice-melt unit of main line, long branch line movable DC
Ice-melt unit and short branch line Portable DC ice-melt unit, by the way that different melt can be selected for different circuit types and length
Ice mode, solves in power distribution network that various arch types are more well, the difficult problem of ice-melt.
5th, when the present invention carries out ice-melt for part circuit, main line can be achieved and do not have a power failure, improve distribution network line ice-melt
When power supply reliability.
Brief description of the drawings
Fig. 1 is the structural representation of the present embodiment distribution network line ice melting system.
Marginal data：1st, the fixed exchange ice-melt unit of main line；11st, ice-melt switchs；12nd, ice-melt protection device；13rd, it is fixed
Ice-melt voltage output device；14th, ice-melt disconnecting link；2nd, long branch line movable DC ice-melt unit；21st, mobile ice-melt TRT；
22nd, the first ice-melt fairing；23rd, vehicle-mounted chassis；24th, the first termination；3rd, short branch line Portable DC ice-melt unit；
31st, portable ice-melt TRT；32nd, the second ice-melt fairing；33rd, the second termination.
Embodiment
As shown in figure 1, the present embodiment distribution network line ice melting system includes the fixed exchange ice-melt unit 1 of main line, drawn money on credit
Line movable DC ice-melt unit 2 and short branch line Portable DC ice-melt unit 3, the fixed exchange ice-melt unit 1 of main line are located at
In transformer station, it is defeated that the fixed exchange ice-melt unit 1 of main line includes ice-melt switch 11, ice-melt protection device 12, fixed ice-melt voltage
Go out device 13, the input of fixed ice-melt voltage output device 13 passes sequentially through ice-melt protection device 12, ice-melt switch 11 and become
The 10kV buses in power station are connected, and the control terminal of ice-melt switch 11 is connected with ice-melt protection device 12, and long branch line movable DC melts
Ice unit 2 includes the ice-melt fairing 22 of mobile ice-melt TRT 21 and first being connected with each other, short branch line Portable DC
Ice-melt unit 3 includes the ice-melt fairing 32 of portable ice-melt TRT 31 and second being connected with each other.
In the present embodiment, the 10kV buses of transformer station can be derived from corresponding regional distribution 35kV or 110kV as needed and become
Power station, ice-melt switch 11 use commercially available KYN28 types 10kV switch cubicles；Ice-melt protection device 12 is protected using commercially available XDBH-10 types
Device, possessed fast tripping protection, stream protection, differential protection function, and be provided simultaneously with excitation surge current identification braking function, ice-melt occurs
Tripping ice-melt switch 11 is cut off the electricity supply during failure；In the present embodiment, fixed ice-melt voltage output device 13 is that more gear voltages are defeated
Go out device, specifically use XDRB-7000 type deicing devices, capacity 7000kVA, input voltage 10kV, can be hindered according to circuit
Anti- selection different stalls ice-melt voltage, to meet the ice-melt needs of different circuit types and length.In the present embodiment, fixed ice-melt
The output end of voltage output device 13 is provided with ice-melt disconnecting link 14, and fixed ice-melt voltage can be easily controlled by ice-melt disconnecting link 14
The voltage output of output device 13, securely and reliably.Ice-melt disconnecting link 14 specifically uses XDDZ-10.5 type disconnecting links, and rated voltage is
10.5kV, three-phase ganged is to improve the reliability of operation.
The fixed exchange ice-melt unit 1 of main line is designed mainly for power distribution network main line ice-melt, and part build distribution change in
Inside power station, in the operating condition, from distribution network transformer substation 10kV bus power takings source, ice-melt switch 11, ice-melt switch 11 are connected to
Connect ice-melt protection device 12, ice-melt protection device 12 is connected ice-melt voltage output device 13, fixed ice-melt voltage output
Device 13 connects ice-melt disconnecting link 14, and ice-melt disconnecting link 14 is linked into by the wire connecting clip and treats ice-melt wire, is led in wire end
Cross shorting stub and carry out three-phase short circuit ground connection, realize exchange ice-melt.Distribution main line circuit is grown, and ice-melt power is big, carries electricity generation system
Deicing device can not meet its ice-melt capacity, and distribution wire diameter is small, and reactive component is suitable with resistive component, high-power to melt
DC ice melting relatively exchanges ice-melt advantage and unobvious during ice, therefore the fixed exchange ice-melt unit 1 of main line of the present embodiment is taken
Mode from transformer station's 10kV buses power taking source on the spot, is input to fixed ice-melt voltage output device 13, and fixed ice-melt voltage is defeated
It is adjustable to go out the low voltage of device 13, the suitable gear of line options can be gone out according to difference, exports three-phase alternating voltage, fixed ice-melt electricity
Pressure output device 13 treats ice-melt main line by wire connecting clip access, and three-phase short circuit ground connection is carried out by shorting stub in main line end,
Close ice-melt switch 11, you can exchange ice-melt is realized, all devices are protected by ice-melt protection device 12 during ice-melt, therefore
Tripping ice-melt switch 11 during barrier.The fixed exchange ice-melt unit 1 of main line can carry out ice-melt for 5km-30km main line wire.
In the present embodiment, mobile ice-melt TRT 21 is diesel-driven generator, and the first ice-melt fairing 22 is six pulse waves
Fairing.Mobile ice-melt TRT 21 specifically uses commercially available comingses diesel-driven generator, generated output 320kW, highest
Output voltage is 400V, sustainable every time to generate electricity 15 hours；First ice-melt fairing 22 is whole using XDZL-600 six pulse waves of type
Flow device, rectified power 600kW.In the present embodiment, long branch line movable DC ice-melt unit 2 also includes vehicle-mounted chassis 23, car
Carry chassis 23 and use commercially available Isuzu Motors motor van, mobile ice-melt TRT 21 and the first ice-melt fairing 22 fill respectively
On vehicle-mounted chassis 23.In the present embodiment, vehicle-mounted chassis 23 is provided with the first termination 24, the first termination 24 and
The output end of one ice-melt fairing 22 is connected, and the first termination 24 specifically uses YDJX-500 type terminations, by first
The direct current output both positive and negative polarity of ice-melt fairing 22 docks with three-phase line, rated current 500A.
Set when long branch line movable DC ice-melt unit 2 is mainly for the long branch line of power distribution network or main line part ice-melt
Meter, part can be realized by vehicle-mounted chassis 23 and moved, and be used as power supply by mobile ice-melt TRT 21, it is whole to be linked into the first ice-melt
Device 22 is flowed, the first ice-melt fairing 22 is moved and is connected to the first termination 24, the first termination 24 realizes that direct current is positive and negative
Docking between pole and AC three-phase, the first termination 24 is linked into by the wire connecting clip treats ice-melt conducting line segment head end,
Treat ice-melt conducting line segment end by the shorting stub carry out three-phase short circuit ground connection, realize that long branch line or main line local DC melts
Ice.Distribution line line style is complicated, a variety of line style mixed set-ups often be present on branch line and part main line, directly takes master
Wire mounting exchanges the wire progress ice-melt that ice-melt unit 1 can only be small to line footpath, and the wire big to line footpath exist during ice-melt
Blow the risk of small line footpath wire.Long branch line movable DC ice-melt unit 2 is used as power supply using mobile ice-melt TRT 21,
After the rectification of the first ice-melt fairing 22, ice-melt conducting line segment is treated by being linked into after wire connecting clip, is treating ice-melt conducting line segment
End carries out three-phase short circuit ground connection by shorting stub, starts mobile ice-melt TRT 21 and draw money on credit line or part main line can be achieved
DC ice melting.Long branch line movable DC ice-melt unit 2 is monolithically integrated on vehicle-mounted chassis 23, can flexibly be realized movement, be adopted
The mobile capacity of ice-melt TRT 21 can be reduced with DC ice melting, reduces the volume on vehicle-mounted chassis 23, optionally to not
DC ice melting is carried out with icing section.Long branch line movable DC ice-melt unit 2 can enter for 0-5km branch line and local main line
Row ice-melt.
In the present embodiment, portable ice-melt TRT 31 is intermediate frequency generator, and the second ice-melt fairing 32 is six pulse waves
Fairing.Portable ice-melt TRT 31 specifically uses commercially available TF-12 types intermediate frequency generator, generated output 12kW, maximum
Output voltage is 24V, weight 70kg；Second ice-melt fairing 32 specifically uses the pulse wave rectifier device of XDZL-15 types six, whole
Flow power 15kW.In the present embodiment, short branch line Portable DC ice-melt unit 3 also includes the second termination 33, the second wiring
Device 33 is connected with the output end of the second ice-melt fairing 32.Second termination 33 is specifically filled using the wiring of YDJX-400 types
Put, the direct current output both positive and negative polarity of the second ice-melt fairing 32 is docked with three-phase line, rated current 400A.Short branch line is just
The line ice-melting that taking formula DC ice melting unit 3 can not arrive at mainly for the short branch line of power distribution network or vehicle is designed, short branch line
Portable DC ice-melt unit 3 can be based on portable ice-melt TRT 31 and realize mobile ice-melt as carrying subject, be melted by portable
Ice TRT 31 is used as power supply, is linked into the second ice-melt fairing 32, and the second ice-melt fairing 32 is linked into second and connect
Line apparatus 33, the second termination 33 is linked into by the wire connecting clip treats ice-melt conducting line segment head end, is treating ice-melt conducting line segment
End carries out three-phase short circuit ground connection by the shorting stub, realizes the DC ice melting for the circuit that short branch line or vehicle can not arrive at.
Many power distribution networks are in the obvious remote mountain areas of mima type microrelief microclimate, and icing situation is serious but traffic is extremely inconvenient, and vehicle enters
It is difficult.Short branch line Portable DC ice-melt unit 3 takes the pattern of small power generation platform, take can 4 people carry portable ice-melt
TRT 31 is used as ice-melt power supply, after the rectification of the second ice-melt fairing 32, waits to melt by being linked into after wire connecting clip
Ice conducting line segment, treat ice-melt conducting line segment end by shorting stub carry out three-phase short circuit ground connection, start portable ice-melt TRT 31
Short branch line or vehicle, which can be achieved, can not arrive at the DC ice melting of circuit.Short branch line Portable DC ice-melt unit 3 can be directed to 0-
400m wire carries out ice-melt.
In summary, the present embodiment distribution network line ice melting system includes the fixed exchange ice-melt unit 1 of main line, long branch line
Movable DC ice-melt unit 2 and short branch line Portable DC ice-melt unit 3, possess a variety of ways to take power, can flexibly select to hand over
DC ice melting mode, ice-melt mobility strong, various arch types are more in solution power distribution network well, the difficult problem of ice-melt, cover
The ice-melt of a certain all power distribution networks in region, is greatly enhanced the ability that distribution network line resists a wide range of freezing rain and snow disaster.
The step of de-icing method of the present embodiment distribution network line ice melting system, includes：
1) the power distribution network main line icing situation of distribution network line is detected, if power distribution network main line reaches the first designated ratio
Icing occurs for (specific value is 30% in the present embodiment, can be adjusted as needed) range above, then redirects execution step
2)；Otherwise redirected when power distribution network main line part icing and perform step 3)；
If 2) power distribution network main line icing reaches default icing warning value, by small section in the power distribution network main line of icing
The output end of fixed ice-melt voltage output device 13 is connected and by target line as target line by face wire with target line
End short circuit ground connection, open ice-melt and switch 11 pairs of target lines and carry out exchange ice-melt；Redirect and perform step 4)；
If 3) power distribution network main line part icing reaches default icing warning value, by the power distribution network main line of local icing
In large-section lead section as target line, by the output end of the first ice-melt fairing 22 and one end phase of target line
DC ice melting even and by the end short circuit ground connection of target line, unlatching mobile ice-melt TRT 21 is carried out to target line；Jump
Turn to perform step 4)；
4) the long branch line icing situation of power distribution network of distribution network line is detected, if the long branch line of power distribution network, which reaches second, specifies ratio
Icing occurs for example range above, then redirects and perform step 5)；Otherwise execution step is redirected when the long branch line part icing of power distribution network
6)；
5) if the long branch line icing of power distribution network reaches default icing warning value, the small bore in power distribution network main line is led
Target line is used as after the long branch line series connection of the power distribution network of line and icing, by the output end of fixed ice-melt voltage output device 13
It is connected with target line and the end short circuit ground connection of target line, unlatching ice-melt 11 pairs of target lines of switch is carried out exchange and melted
Ice；Redirect and perform step 7)；
If 6) the long branch line part icing of power distribution network reaches default icing warning value, the power distribution network of local icing is grown
The output end of first ice-melt fairing 22 is then connected and by target as target line by branch line with one end of target line
The end short circuit ground connection of circuit, open mobile ice-melt TRT 21 and DC ice melting is carried out to target line；Redirect execution step
7)；
7) icing or the fixed exchange ice-melt list of main line occur for the target line being directed between the span of distribution network line part
Member 1 and long branch line movable DC ice-melt unit 2 can not carry out the target line of ice-melt, if target line icing reaches default
Icing warning value, then the output end of the second ice-melt fairing 32 is connected with one end of target line and by target line
End short circuit ground connection, opens portable ice-melt TRT 31 and carries out DC ice melting to target line.
In the present embodiment, it is connected with one end of target line and specifically refers to respectively by the every of wire connecting clip and target line
One phase conductor one end is connected.In the present embodiment, wire connecting clip uses XDJJ-2 type fast-wiring wire clamps, wire clamp can directly mount with
Treat DC ice-melting head end.In the present embodiment, the end short circuit ground connection of target line is referred to respectively by shorting stub by score
It is grounded again by grounding nail after each phase conductor of road end is commonly connected.In the present embodiment, shorting stub is short using XDDJ-3 types
Connection device, device possess grounding nail.
Such as in distribution network line, certain power distribution network main line is LGJ-95 and LGJ-70 various arch types, length 15km, wherein
The long 9km of LGJ-95 wires, the long 6km of LGJ-70 wires, there are in LGJ-70 wires 5km sections serious icing occur, that is, be up to and cover
Ice warning value.According to the de-icing method of the present embodiment distribution network line ice melting system, consolidated for transformer station's main line using main line
Fixed pattern exchange ice-melt unit 1 carries out exchange ice-melt, main line impedance：4.99+j6.00 Ω, LGJ-70 wire ice melting current scope are
290A~420A, exchanged according to formula (1) with (2) ice-melt calculation formula can calculate ice-melt voltage range for 3918V~
5674V。
In formula (1) and (2), UminFor the minimum value of ice-melt voltage range, UmaxFor the maximum of ice-melt voltage range, Imin
For wire ice melting current stated range minimum, ImaxFor wire ice melting current scope maximum, R is line resistance value, and X is line electricity
Inductance value.Within the scope of choosing the fixed ice-melt voltage of ice-melt voltage output device 13 herein, the protection of setting ice-melt protection device 12
Definite value, ice-melt disconnecting link 14 is closed, ice-melt voltage output device 13 is connected with treating ice-melt wire head end by wire connecting clip,
Wire end carries out three-phase short circuit, closes ice-melt and switchs 11 (breakers), you can starts to carry out ice-melt to wire.After ice-melt terminates
Ice-melt switch 11 is disconnected, removes wiring.
Such as in distribution network line, the serious icing of 3km occur in one, somewhere LGJ-50 branch lines, that is, it is up to icing warning
Value, local transit is adapted to long branch line movable DC ice-melt unit 2 to enter, according to the present embodiment distribution network line ice melting system
De-icing method, long branch line movable DC ice-melt unit 2 can be taken through and carry out long branch line movement DC ice melting.Icing section lead
Impedance：1.68+j1.55 Ω, LGJ-50 wire ice-melt scopes are 230A~350A, according to DC ice melting calculation formula
Umin=1.5IminR (3)
Umax=2ImaxR (4)
In formula (3) and (4), UminFor the minimum value of ice-melt voltage range, UmaxFor the maximum of ice-melt voltage range, Imin
For wire ice melting current stated range minimum, ImaxFor wire ice melting current scope maximum, R is line resistance value, wherein three connect
Line takes two coefficients when being in series to take 2, and coefficient takes 1.5 when three phase connections take two and a string of.Calculate DC ice melting voltage range
For 580V~1176V.Long branch line movement ice-melt part is positioned among ice coating wire section, carries out short circuit at one end first, directly
It is only 1/2 (U to flow ice-melt voltage rangemin~Umax), i.e. 290V~588V.
The rated output voltage U of long branch line movable DC ice-melt unit 2dc=1.25Uac=500V.Using wire connecting clip
The output voltage of long branch line movable DC ice-melt unit 2 is connected to and treated among ice-melt wire (target line), by shorting stub
Ice-melt wire end ground connection is being treated, is starting mobile ice-melt TRT 21, regulation ice melting current can start to melt to suitable size
Ice, after three-phase ice-melt terminates, mobile ice-melt TRT 21 is closed, removes shorted on one end line, three-phase short circuit is carried out in the other end,
DC ice melting is carried out to other half circuit.After the completion of all line ice-meltings, wiring is removed.
Such as in distribution network line, there is the serious icing of 0.5km in one, somewhere LGJ-70 branch lines, and icing section is positioned at inclined
Distant mountain area, vehicle cannot be introduced into, and have LGJ-70, LGJ-50 various arch types on the main line where branch line, and ice covering thickness will reach
To icing warning value, according to the de-icing method of the present embodiment distribution network line ice melting system, short branch line Portable DC is taken to melt
Ice unit 3 carries out short branch line Portable direct-current ice-melt.Icing section lead impedance：0.20+j0.20 Ω, LGJ-70 wire ice-melt scopes
For 290A~420A, it is 87V~168V to calculate DC ice melting voltage range according to formula (3) and (4).Short branch line Portable DC melts
The rated output voltage U of ice unit 3dc=1.25Uac=30V.In view of the short mobility strong of branch line Portable DC ice-melt unit 3
Feature, icing section is divided into 5 parts, is then 17.4V~33.6V per Partial DC ice-melt voltage range, it is portable in short branch line
Within the ice melting capability of formula DC ice melting unit 3, the portable ice-melt part of short branch line is connected to using wire connecting clip and treats ice-melt section,
Three-phase short circuit is carried out in end, starts portable ice-melt TRT 31, regulation ice melting current to suitable size, you can start to melt
Ice, after three-phase ice-melt terminates, portable ice-melt TRT 31 is closed, starts next section of ice-melt, until all 5 section ice-melts are complete
Terminate in portion.
In summary, the de-icing method of the present embodiment distribution network line ice melting system according to the icing section of service interruption and
Icing situation, ice-melting mode can be flexibly chosen, reduce the workload of system operation maintenance, ice-melt mobility strong, ice-melt efficiency
Height, the ice-melt that can have carried out to all distribution lines in a certain region, ice-melt scope include all main line and branch line,
And take from three kinds of transformer station's power taking source, vehicle power and portable power supplies ways to take power, when taking into account distribution line ice-melt
Ice-melt capacity and ice-melt convenience, exploitativeness are strong.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of de-icing method of distribution network line ice melting system, distribution network line ice melting system includes the fixed exchange of main line and melted
Ice unit (1), long branch line movable DC ice-melt unit (2) and short branch line Portable DC ice-melt unit (3), the main line are consolidated
In transformer station, the fixed exchange ice-melt unit (1) of main line switchs fixed pattern exchange ice-melt unit (1) including ice-melt
(11), ice-melt protection device (12), fixed ice-melt voltage output device (13), the fixed ice-melt voltage output device (13)
Input passes sequentially through ice-melt protection device (12), ice-melt switch (11) is connected with the 10kV buses of transformer station, and the ice-melt is opened
The control terminal for closing (11) is connected with ice-melt protection device (12), and the long branch line movable DC ice-melt unit (2) includes mutual
The mobile ice-melt TRT (21) of connection and the first ice-melt fairing (22), the short branch line Portable DC ice-melt unit
(3) portable ice-melt TRT (31) and the second ice-melt fairing (32) being connected with each other are included, it is characterised in that step bag
Include：
1) the power distribution network main line icing situation of distribution network line is detected, if power distribution network main line reaches the first designated ratio above model
Generation icing is enclosed, then redirects and performs step 2)；Otherwise redirected when power distribution network main line part icing and perform step 3)；
If 2) power distribution network main line icing reaches default icing warning value, the small bore in the power distribution network main line of icing is led
The output end of fixed ice-melt voltage output device (13) is connected and by target line as target line by line with target line
End short circuit ground connection, opens ice-melt switch (11) and carries out exchange ice-melt to target line；Redirect and perform step 4)；
If 3) power distribution network main line part icing reaches default icing warning value, by the power distribution network main line of local icing
Large-section lead section is as target line, by the output end of the first ice-melt fairing (22) and one end phase of target line
DC ice melting even and by the end short circuit ground connection of target line, unlatching mobile ice-melt TRT (21) is carried out to target line；
Redirect and perform step 4)；
4) detect distribution network line the long branch line icing situation of power distribution network, if the long branch line of power distribution network reach the second designated ratio with
Icing occurs for upper scope, then redirects and perform step 5)；Otherwise redirected when the long branch line part icing of power distribution network and perform step 6)；
If 5) the long branch line icing of power distribution network reaches default icing warning value, by the small section lead in power distribution network main line and
Be used as target line after the long branch line series connection of the power distribution network of icing, by the output end of fixation ice-melt voltage output device (13) with
Target line is connected and the end short circuit ground connection of target line, unlatching ice-melt switch (11) is carried out exchange to target line and melted
Ice；Redirect and perform step 7)；
If 6) the long branch line part icing of power distribution network reaches default icing warning value, by the long branch line of the power distribution network of local icing
As target line, then the output end of the first ice-melt fairing (22) is connected with one end of target line and by score
The end short circuit ground connection on road, opens mobile ice-melt TRT (21) and carries out DC ice melting to target line；Redirect execution step
7)；
7) icing or the fixed exchange ice-melt unit (1) of main line occur for the target line being directed between the span of distribution network line part
The target line of ice-melt can not be carried out with long branch line movable DC ice-melt unit (2), if target line icing reaches default
Icing warning value, then the output end of the second ice-melt fairing (32) is connected with one end of target line and by target line
End short circuit ground connection, open portable ice-melt TRT (31) and DC ice melting carried out to target line.
2. the de-icing method of distribution network line ice melting system according to claim 1, it is characterised in that described and score
The one end on road, which is connected, to be specifically referred to by wire connecting clip with each phase conductor one end of target line be connected respectively.
3. the de-icing method of distribution network line ice melting system according to claim 2, it is characterised in that described by score
The end short circuit ground connection on road refer to respectively by shorting stub by each phase conductor of target line end it is commonly connected after pass through again
Grounding nail is grounded.
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| CN201610589866.XA CN106207925B (en) | 2016-07-25 | 2016-07-25 | A kind of distribution network line ice melting system and its de-icing method |
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| CN107394734B (en) * | 2017-08-30 | 2018-11-20 | 国网湖南省电力公司 | The exchange de-icing method of 35kV distribution network line |
| CN107482530A (en) * | 2017-09-20 | 2017-12-15 | 湖南省湘电试研技术有限公司 | Based on the Portable rural distribution exchange de-icing method and device for handing over orthogonal Two Stages |
| CN107658778A (en) * | 2017-10-08 | 2018-02-02 | 国网江西省电力公司电力科学研究院 | A kind of quick de-icing method of distribution network line |
| CN108336688B (en) * | 2018-04-23 | 2023-11-14 | 贵州电网有限责任公司 | Mobile direct-current ice melting horizontal access device |
| CN110445080A (en) * | 2019-06-25 | 2019-11-12 | 贵州电网有限责任公司 | A kind of power distribution network vehicle-mounted mobile AC ice melting device and method |
| CN110779577B (en) * | 2019-11-12 | 2021-06-15 | 国网湖南省电力有限公司 | Method and system for acquiring ice melting technical parameters of hot water deicing system |
| CN111668791B (en) * | 2020-06-19 | 2021-07-27 | 南方电网数字电网研究院有限公司 | DC serial ice melting device and system |
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| CN202260346U (en) * | 2011-09-20 | 2012-05-30 | 湖南省电力公司科学研究院 | Alternating current (AC) ice-melting device with controllable output voltage |
| CN202368450U (en) * | 2011-11-30 | 2012-08-08 | 龙岩市海德馨汽车有限公司 | Circuit de-icing generator vehicle |
| CN202633873U (en) * | 2012-06-01 | 2012-12-26 | 湖南省电力公司科学研究院 | Portable ultrashort-distance direct current ice-melting device of agriculture electric power distribution network |
| CN205882638U (en) * | 2016-07-25 | 2017-01-11 | 国网湖南省电力公司 | Join in marriage electric network line ice -melt system |
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