CN107516846A - New de-icing method for agriculture distribution - Google Patents
New de-icing method for agriculture distribution Download PDFInfo
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- CN107516846A CN107516846A CN201710766214.3A CN201710766214A CN107516846A CN 107516846 A CN107516846 A CN 107516846A CN 201710766214 A CN201710766214 A CN 201710766214A CN 107516846 A CN107516846 A CN 107516846A
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- ice
- melt
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- transformer
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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
- 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
Ice-melt transformation is carried out the invention discloses a kind of new de-icing method for agriculture distribution, including to existing agriculture distribution；It is determined that need ice-melt treats ice-melt section；Distribution line has a power failure and disconnects isolation circuit breakers；Distribution transformer is selected, outputting it to hold and connect DC ice-melting all the way, to ice-melt section head end is treated, will treat the direct short circuit of ice-melt segment ends；Closed circuit breaker treats ice-melt section and carries out ice-melt；Open-circuit line breaker after the completion of ice-melt, DC ice-melting and shorting stub are removed, close isolation circuit breakers；Repeat the above steps, until the ice-melt work of all sections is completed；Closed circuit breaker, distribution line restore electricity.The present invention is simple and convenient, and ice-melt scope is wide, and transformation is convenient, and investment is small, can sectional ice-melt, save ice-melt power, and ice-melt is flexible；Be alternating voltage during ice-melt, can not turn off along part distribution transformer, workload is small, substantially reduces ice-melt operating time, and ice-melt easy-to-connect, ice-melt efficiency high.
Description
Technical field
Present invention relates particularly to a kind of new de-icing method for agriculture distribution.
Background technology
With the development and the improvement of people's living standards of national economy technology, electric energy has become people's production and life
Essential secondary energy sources in work, production and life to people bring endless facility.
However, the transmission line of electricity of power system is often arranged in outdoor, boisterous influence subject.In recent years, it is southern
The regional freezing rain and snow disaster in side is taken place frequently, and serious influence is caused to operation of power networks.Agriculture distribution line is and more due to multi-point and wide-ranging
The obvious mountain area of mima type microrelief microclimate is distributed in, winter icing situation especially severe, securely and reliably power supply causes to agriculture distribution
Serious threat.Electric current de-icing technology is the maximally efficient means of current reply Ice Disaster in Power Grids, but existing ice-melt research is main
It is directed to major network.Existing agriculture distribution line, its line construction are as shown in Figure 1：The agriculture distribution typically power taking from 10kV buses 1,
Output distribution circuit 4 after being protected by line-breaker 2, on distribution line 4 and multiple distribution transformers 31 are connect by voltage
Supplying power for outside after being depressured.Existing agriculture distribution line, because the branch line of circuit is more, and ice-covering area is mostly what is had inconvenient traffic
Mountain area, existing de-icing method cannot be used directly for agriculture distribution line ice-melt.Part R＆D institution, which develops, utilizes vehicle power
Move formula DC ice melting, be depressured the ice-melting modes such as ice-melt using AC power in station, formula is moved using vehicle power
Power distribution network transformer along need to being pulled open during the ice-melting mode ice-melt of DC ice melting, ice-melt preliminary preparation amount is big, ice-melt effect
Rate is low, and is limited during ice-melt by vehicle power capacity, and ice-melt is apart from limited；When being depressured ice-melt using AC power in station, need
A set of ice-melt dedicated transformer is set up in station, main line can only be typically directed to and carry out ice-melt, and cost of investment is higher, promotes at present
Seldom.Under the big situation that current major network is strong, distribution is weak, agriculture distribution network systems still lack cost-effective ice-melt means.
The content of the invention
Agriculture distribution ice-melt can be effectively realized it is an object of the invention to provide a kind of and de-icing method is simple and reliable
New de-icing method for agriculture distribution.
This new de-icing method for agriculture distribution provided by the invention, comprises the following steps：
S1. following ice-melt transformation is carried out to existing agriculture distribution：The ice-melt is transform as to be increased on existing distribution line
Add several isolation circuit breakers, isolation circuit breakers are arranged on distribution line, lean on main line mains side by distribution transformer；It is described every
In circuit normal work it is closure state from breaker；
S2. if distribution line icing needs to carry out ice-melt, it is determined that this time needing to carry out ice-melt to treat ice-melt section；
S3. open-circuit line breaker causes distribution line to have a power failure, and after carrying out safety measure, then disconnects and treats ice-melt section and this
Isolation circuit breakers between the secondary section without ice-melt, needed without the section of ice-melt close to line electricity source；
S4. one is selected to become close to the distribution for treating ice-melt section in this is without the distribution transformer of the section of ice-melt
Depressor by the output end of the distribution transformer and connects DC ice-melting all the way and is connected to and treat the head of ice-melt section as ice-melt transformer
End, while the direct short circuit in end that will treat ice-melt section using shorting stub；
S5. closed circuit breaker, ice-melt is treated using the distribution transformer described in step S4, DC ice-melting and shorting stub
Section carries out ice-melt；
S6. after the completion of ice-melt, open-circuit line breaker, described DC ice-melting and shorting stub are removed, and close step S3
Described isolation circuit breakers；
S7. repeat the above steps, until the ice-melt work of all sections is completed；It is closed again line-breaker, distribution line
Recover normal power supply.
Breaker is also equipped with described DC ice-melting, for being protected to DC ice-melting.
The station power distribution transformer of selection one described in step S4 is specially matched somebody with somebody as ice-melt transformer using following steps selection
Piezoelectric transformer is as ice-melt transformer：
A. ice-melt section is treated according to what step S2 was selected, calculates the line length for treating ice-melt section；
B. the line length obtained according to step A calculates the demand capacity of ice-melt transformer；
C. the demand capacity of capacity not less than ice-melt transformer is selected and positioned at the section without ice-melt and close
Treat the distribution transformer of ice-melt section as ice-melt transformer.
The station power distribution transformer of selection one described in step S4 is specially matched somebody with somebody as ice-melt transformer using following steps selection
Piezoelectric transformer is as ice-melt transformer：
A. ice-melt section is treated according to what step S2 was selected, calculates the line length for treating ice-melt section；
B. calculate it is all this time without ice-melt section distribution transformer as ice-melt transformer carry out ice-melt when
It is capable of the ultimate range of ice-melt；
C. select the ultimate range of an ice-melt to be more than the line length for treating ice-melt section and be located at the area without ice-melt
Section is close to treat the distribution transformer of ice-melt section as ice-melt transformer.
This new de-icing method for agriculture distribution provided by the invention, available for agriculture distribution line ice-melt, during ice-melt
It is simple and convenient using the distribution transformer being connected on circuit as ice-melt power supply, it can completely implement ice-melt, ice-melt scope to circuit
Extensively；The present invention is in ice-melt, it is only necessary to implements isolation transformation to circuit, transformation is convenient, and investment is small, only icing section can be implemented to melt
Ice, ice-melt power is effectively saved, and ice-melt is flexible；In addition, the present invention is alternating voltage in ice-melt, edge can not turned off
The part distribution transformer of line, workload is small, substantially reduces ice-melt operating time, and ice-melt easy-to-connect, ice-melt efficiency high.
Brief description of the drawings
Fig. 1 is the structural representation of existing agriculture distribution line.
Fig. 2 is the flow chart of the inventive method.
Fig. 3 is the connection schematic diagram of embodiments of the invention.
Embodiment
The flow chart of the inventive method is illustrated in figure 2, Fig. 3 is the connection schematic diagram of embodiments of the invention：This
This new de-icing method for agriculture distribution provided is provided, comprised the following steps：
S1. following ice-melt transformation is carried out to existing agriculture distribution：The ice-melt is transform as to be increased on existing distribution line
Add several isolation circuit breakers 32, isolation circuit breakers are arranged on distribution line, lean on main line mains side by distribution transformer；It is described
Isolation circuit breakers are closure state in circuit normal work；
S2. if distribution line icing needs to carry out ice-melt, it is determined that this time needing to carry out ice-melt to treat ice-melt section；
S3. open-circuit line breaker causes distribution line to have a power failure, and after carrying out safety measure, then disconnects and treats ice-melt section and this
Isolation circuit breakers between the secondary section without ice-melt, needed without the section of ice-melt close to line electricity source；
S4. one is selected to become close to the distribution for treating ice-melt section in this is without the distribution transformer of the section of ice-melt
Depressor as ice-melt transformer, by the output end of the distribution transformer and connect DC ice-melting 33 all the way (can be with DC ice-melting
Breaker is installed, for being protected to DC ice-melting) head end for treating ice-melt section is connected to, while will be treated using shorting stub
The direct short circuit in end (short circuit is carried out using shorting stub 34 in Fig. 3) of ice-melt section；
When selecting distribution transformer as ice-melt transformer, one in the following two kinds method can be used in the specific implementation
Kind：
Method one：
Distribution transformer is selected as ice-melt transformer using following steps：
A. ice-melt section is treated according to what step S2 was selected, calculates the line length for treating ice-melt section；
B. the line length obtained according to step A calculates the demand capacity of ice-melt transformer；
C. the demand capacity of capacity not less than ice-melt transformer is selected and positioned at the section without ice-melt close to treating
The distribution transformer of ice-melt section is as ice-melt transformer；
Method two：
A. ice-melt section is treated according to what step S2 was selected, calculates the line length for treating ice-melt section；
B. calculate it is all this time without ice-melt section distribution transformer as ice-melt transformer carry out ice-melt when
It is capable of the ultimate range of ice-melt；
C. select the ultimate range of an ice-melt to be more than the line length for treating ice-melt section and be located at the area without ice-melt
Section is close to treat the distribution transformer of ice-melt section as ice-melt transformer；
S5. closed circuit breaker, ice-melt is treated using the distribution transformer described in step S4, DC ice-melting and shorting stub
Section carries out ice-melt；
S6. after the completion of ice-melt, open-circuit line breaker, described DC ice-melting and shorting stub are removed, and close step S3
Described isolation circuit breakers；
S7. repeat the above steps, until the ice-melt work of all sections is completed；It is closed again line-breaker, distribution line
Recover normal power supply.
It is illustrated in figure 3 the connection schematic diagram of embodiments of the invention：
Determine the ice-melt distance per station power distribution transformer first, with current distribution network system using more 200kVA,
Exemplified by 315kVA and 400kVA distribution transformers, input, output voltage are 10kV/400V, and secondary rated current is respectively
288A, 454A and 577A, ice-melt distance is calculated according to formula, ice-melt of three kinds of capacity transformers to various agriculture distribution line styles can be obtained
Distance is calculated as follows：
The 200kVA distribution transformer ice-melt distances of table 1
| Line style | Z0(Ω/km) | Imin(A) | Imax(A) | Smin(km) | Smax(km) |
| LGJ×35 | 0.848 | 200 | 300 | 1.64 | 2.36 |
| LGJ×50 | 0.699 | 230 | 350 | 1.99 | 2.49 |
The 315kVA distribution transformer ice-melt distances of table 2
| Line style | Z0(Ω/km) | Imin(A) | Imax(A) | Smin(km) | Smax(km) |
| LGJ×35 | 0.848 | 200 | 300 | 1.57 | 2.36 |
| LGJ×50 | 0.699 | 230 | 350 | 1.64 | 2.49 |
| LGJ×70 | 0.569 | 290 | 420 | 1.67 | 2.42 |
| LGJ×95 | 0.499 | 360 | 520 | 1.77 | 2.23 |
| LGJ×120 | 0.554 | 420 | 650 | 1.59 | 1.72 |
The 400kVA distribution transformer ice-melt distances of table 3
| Line style | Z0(Ω/km) | Imin(A) | Imax(A) | Smin(km) | Smax(km) |
| LGJ×35 | 0.848 | 200 | 300 | 1.57 | 2.36 |
| LGJ×50 | 0.699 | 230 | 350 | 1.64 | 2.49 |
| LGJ×70 | 0.569 | 290 | 420 | 1.67 | 2.42 |
| LGJ×95 | 0.499 | 360 | 520 | 1.54 | 2.23 |
| LGJ×120 | 0.554 | 420 | 650 | 1.25 | 1.72 |
| LGJ×150 | 0.530 | 480 | 800 | 1.31 | 1.57 |
| LGJ×185 | 0.439 | 540 | 920 | 1.58 | 1.69 |
Line style is the wire of LGJ × 50, can choose a 200kVA distribution nearby by mains side outside easy icing section
Transformer installs isolation circuit breakers, this ice-melt unit melts as ice-melt power supply between distribution transformer and icing segment line
Ice distance is 1.99km-2.49km, equally chooses the distribution transformer and dress of suitable capacity after distance in OK range herein
If isolation circuit breakers, until all easily icing sections of ice-melt scope covering.
This new de-icing method for agriculture distribution provided by the invention, is applicable not only to agriculture distribution line, is also suitable
In other distribution network lines.
Claims (4)
1. a kind of new de-icing method for agriculture distribution, comprise the following steps：
S1. following ice-melt transformation is carried out to existing agriculture distribution：If the ice-melt is transform as to be increased on existing distribution line
Dry isolation circuit breakers, isolation circuit breakers are arranged on distribution line, lean on main line mains side by distribution transformer；The isolation is disconnected
Road device is closure state in circuit normal work；
S2. if distribution line icing needs to carry out ice-melt, it is determined that this time needing to carry out ice-melt to treat ice-melt section；
S3. open-circuit line breaker causes distribution line to have a power failure, and after carrying out safety measure, then disconnects and treats ice-melt section with this not
The isolation circuit breakers between the section of ice-melt are carried out, are needed without the section of ice-melt close to line electricity source；
S4. one is selected in this is without the distribution transformer of the section of ice-melt close to the distribution transformer for treating ice-melt section
As ice-melt transformer, by the output end of the distribution transformer and connect DC ice-melting all the way and be connected to and treat the head end of ice-melt section,
The direct short circuit in end that ice-melt section will be treated using shorting stub simultaneously；
S5. closed circuit breaker, ice-melt section is treated using the distribution transformer described in step S4, DC ice-melting and shorting stub
Carry out ice-melt；
S6. after the completion of ice-melt, open-circuit line breaker, described DC ice-melting and shorting stub are removed, and close described in step S3
Isolation circuit breakers；
S7. repeat the above steps, until the ice-melt work of all sections is completed；Line-breaker is closed again, distribution line recovers
Normal power supply.
2. the new de-icing method according to claim 1 for agriculture distribution, it is characterised in that in described DC ice-melting
Breaker is also equipped with, for being protected to DC ice-melting.
3. the new de-icing method according to claim 1 or 2 for agriculture distribution, it is characterised in that the choosing described in step S4
A station power distribution transformer is selected as ice-melt transformer, specially selects distribution transformer as ice-melt transformation using following steps
Device：
A. ice-melt section is treated according to what step S2 was selected, calculates the line length for treating ice-melt section；
B. the line length obtained according to step A calculates the demand capacity of ice-melt transformer；
C. the demand capacity of capacity not less than ice-melt transformer is selected and positioned at the section without ice-melt close to treating ice-melt
The distribution transformer of section is as ice-melt transformer.
4. the new de-icing method according to claim 1 or 2 for agriculture distribution, it is characterised in that the choosing described in step S4
A station power distribution transformer is selected as ice-melt transformer, specially selects distribution transformer as ice-melt transformation using following steps
Device：
A. ice-melt section is treated according to what step S2 was selected, calculates the line length for treating ice-melt section；
B. calculate it is all this time without ice-melt section distribution transformer as ice-melt transformer carry out ice-melt when can
The ultimate range of ice-melt；
C. select the ultimate range of an ice-melt to be more than the line length for treating ice-melt section and be located to lean on without the section of ice-melt
Closely treat the distribution transformer of ice-melt section as ice-melt transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710766214.3A CN107516846B (en) | 2017-08-30 | 2017-08-30 | Ice melting method for agricultural distribution network |
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|---|---|---|---|
| CN201710766214.3A CN107516846B (en) | 2017-08-30 | 2017-08-30 | Ice melting method for agricultural distribution network |
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| CN107516846B CN107516846B (en) | 2020-01-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110854738A (en) * | 2019-11-29 | 2020-02-28 | 国网湖南省电力有限公司 | Segmented ice melting method for high-voltage transmission line |
| CN112290548A (en) * | 2020-11-06 | 2021-01-29 | 国网湖南省电力有限公司 | Automatic switching-on and switching-off device of distribution transformer for agricultural distribution network alternating current ice melting |
| CN113964773A (en) * | 2021-11-03 | 2022-01-21 | 国网湖南省电力有限公司 | Distribution network line distribution transformer rapid ice melting system and ice melting method thereof |
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| CN103236668A (en) * | 2013-02-03 | 2013-08-07 | 凯里供电局 | Ice-melting method with voltage reduction, current increase and short circuit by using series connection of two transformers |
| CN105262001A (en) * | 2015-11-24 | 2016-01-20 | 国网四川省电力公司电力科学研究院 | Ice melting method for overhead ground wire of power transmission line |
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| US4085338A (en) * | 1976-02-20 | 1978-04-18 | Georgy Andreevich Genrikh | High-voltage network for areas with high rate of icing |
| CN101242087A (en) * | 2008-03-10 | 2008-08-13 | 薛辉 | Ice fusion method for power transmission line |
| CN102290773A (en) * | 2011-08-25 | 2011-12-21 | 中国电力工程顾问集团西南电力设计院 | Wiring method for realizing full-automatic operation of direct-current deicing of line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110854738A (en) * | 2019-11-29 | 2020-02-28 | 国网湖南省电力有限公司 | Segmented ice melting method for high-voltage transmission line |
| CN112290548A (en) * | 2020-11-06 | 2021-01-29 | 国网湖南省电力有限公司 | Automatic switching-on and switching-off device of distribution transformer for agricultural distribution network alternating current ice melting |
| CN113964773A (en) * | 2021-11-03 | 2022-01-21 | 国网湖南省电力有限公司 | Distribution network line distribution transformer rapid ice melting system and ice melting method thereof |
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