CN106856319A - A kind of deicing device that DC current is passed through to icing circuit - Google Patents
A kind of deicing device that DC current is passed through to icing circuit Download PDFInfo
- Publication number
- CN106856319A CN106856319A CN201710132628.0A CN201710132628A CN106856319A CN 106856319 A CN106856319 A CN 106856319A CN 201710132628 A CN201710132628 A CN 201710132628A CN 106856319 A CN106856319 A CN 106856319A
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- China
- Prior art keywords
- current
- icing
- circuit
- ice
- icing circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
Abstract
The present invention discloses a kind of deicing device that DC current is passed through to icing circuit, including：Icing circuit, DC current generating means and shortening contact, described DC current generator are connected with pulse current generator controller；The both positive and negative polarity of pulse current generator controller is connected with the both sides of described icing circuit one end, the both sides shortening contact of the other end of icing circuit, transmission line of electricity localized ice build is solved the problems, such as with the heat that DC current device circuit is produced, so as to ensure the stability of link performance for a long time.
Description
Technical field
The present invention relates to DC ice melting field, more particularly to a kind of ice-melt dress that DC current is passed through to icing circuit
Put.
Background technology
DC ice melting is mainly carries out short circuit by transmission line of electricity applying DC voltage and in transmission line of electricity end, makes to lead
Line heating carries out ice-melt to transmission line of electricity, so as to avoid circuit because of icing rod disconnection.The principle of DC ice melting technology is exactly
Using icing circuit as load, apply dc source, providing short circuit current heating wires with low voltage melts icing.But it is right
In the current power for applying, the selection of the ice-melt operating parameter code of DC current such as duration is mainly and relies on dc power
Substantially convert a de-icing technology code for DC current with the resistivity of target line, and melting by related DC current
Ice experience is operated.It is -5 DEG C in environment temperature such as the LGJ240 wires commonly used, during ice covering thickness 10mm, electric current choosing
More than 600A is selected, in 2.5h or so, there is ice-melt to drop.
It is worth noting that, icing circuit is passed through DC current when carrying out ice-melt, the temperature on transmission line of electricity is not equal
Even.The reason for causing non-uniform temperature has：First, the line footpath of the transmission line of electricity that DC current passes through is uneven.On transmission line of electricity
There is the device that circuit crimping joint or shockproof gold utensil etc. are connected on transmission line of electricity, can cause that modeling occurs in the local of transmission line of electricity
Property deformation, cause the line footpath of transmission line of electricity uneven, and then cause the non-uniform temperature on transmission line of electricity.2nd, DC current warp
The resistance of the transmission line of electricity crossed is uneven.Steel-cored aluminium strand regional area process relaxes, and occurs contact electricity between aluminium stock, steel stock
Resistance, when constant electric current is passed through, causes the lax zone resistance of process in DC ice melting operating process higher, therefore the process
The temperature in lax region is also higher, makes the non-uniform temperature of transmission line of electricity.And in the presence of Constant Direct Current electric current, it is above-mentioned
Mean temperature of the temperature of the regional area of transmission line of electricity far above transmission line of electricity（Calculate temperature）, then it is constant being continually fed into
After DC current, the ice on the transmission line of electricity surface of the regional area can be directly sublimed into vapor by thermal evaporation, very low when running into
Ambient temperature when, vapor can again sublimate on outer layer icing, go round and begin again, and will substantially reduce DC ice melting efficiency,
The a large amount of icing being consequently formed have a strong impact on the safety of transmission line of electricity and steel tower；Also occur that transmission line of electricity concentration of local is sent out simultaneously
The problem of heat, causes the hydraulic performance decline of transmission line of electricity.
The content of the invention
It is an object of the invention to provide a kind of deicing device that DC current is passed through to icing circuit, to solve transmission line of electricity
The problem of localized ice build, so as to ensure the stability of link performance for a long time.
To achieve the above object, the invention provides following scheme：
A kind of deicing device that DC current is passed through to icing circuit, including：Icing circuit, DC current generating means and short circuit
Wiring, it is characterised in that：Described DC current generator is connected with pulse current generator controller；Pulse current is controlled
The both positive and negative polarity of device processed is connected with the both sides of described icing circuit one end, the both sides shortening contact of the other end of icing circuit.
Described DC current generating means includes DC current generator and controller；Described controller is arranged on institute
State inside DC current generator.
Adjustment knob is installed outside described DC current generator.
Described DC current generating means power input is connected with external power source.
Compared with prior art, the present invention has following technique effect：Icing line is carried out by the device using pulse current
Road thermal ice-melting, the program is by electric current the increasing or decreasing in some cycles on transmission line of electricity, it is ensured that tieed up on circuit
Hold uniform and stable temperature range, on the one hand can prevent from being continually fed into constant dc and it is persistently overheating caused by icing first distil
Sublimate again icing phenomenon repeatedly so that the icing of transmission line of electricity is gradually melted into water drippage, improves ice-melt efficiency；On the other hand it is logical
Cross the control to current cycle increase and decrease to meet the stabilization of line temperature, partial zones on circuit when preventing use constant current
Domain persistent fever and cause temperature too high, so as to cause circuit mechanical property reduction problem.
Figure of description
Fig. 1 is deicing device structure chart of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in figure 1, a kind of deicing device that DC current is passed through to icing circuit, including：Icing circuit, DC current
Generating means and shortening contact, it is characterised in that：Described DC current generator is connected with pulse current generator controller；
The both positive and negative polarity of pulse current generator controller is connected with the both sides of described icing circuit one end, and the two of the other end of icing circuit
Side shortening contact.
Described DC current generating means includes DC current generator and controller；Described controller is arranged on institute
State inside DC current generator.
Adjustment knob is installed outside described DC current generator.
Described DC current generating means power input is connected with external power source.
Because the steel core in the steel-cored aluminium strand of power transmission and transformation line is cold drawn wire, aluminium stock is also cold-drawn aluminium stock, described
Cold drawn wire（Steel wire）With cold-drawn aluminium stock（Aluminium stock）The characteristics of belonging to cold-drawn metal, cold-drawn metal be by cold deformation and then
Reinforcing.In steel wire and aluminium stock, due to cold deformation, steel wire and aluminium stock produce substantial amounts of dislocation, and the rising of dislocation density improves steel
The yield strength and tensile strength of silk and aluminium stock, under these conditions, there is the steel-cored aluminium strand of process higher using to carry
Lotus.But, this cold deformation wire rod will recover after it experienced certain temperature, i.e., in uniform temperature and time
Under effect, dislocation is recovered, density reduction, therefore its mechanical property can also occur obvious reduction.In the failure of some transmission lines of electricity
In analysis report, under the conditions of abnormal service temperature, steel wire therein can be by under normal condition for some steel-cored aluminium strands
1500-1700MPa is reduced to 1000-1200MPa, and aluminum stranded conductor can be reduced to 80MPa by 170MPa.In such a situa-tion, it is whole
Individual steel-cored aluminium strand begins to occur destruction since the weak link of these performances reduction, most during lasting military service
Cause fracture eventually.After icing operation is completed, occurred in that in some circuits it is abnormal stranded, or even broken string report, in broken string
Region, steel wire significantly decreases with the intensity of aluminium stock.Particularly steel wire, regional area intensity can be reduced to by 1600MPa
1200MPa。
Because direct current ice-melt is main, it is most directly perceived the need for be to realize that temperature rise carrys out melted surface icing in circuit surface,
Therefore under many circumstances, the direct current power of input, duration makes surface temperature rise reach 50-70 DEG C of temperature, opens
When beginning gradually causes the fusing of icing layer, internal temperature often taller 30-40 DEG C of specific surface, in some steel-cored aluminium strand materials
Extremely uneven region, temperature may be close to more than 150 DEG C, if being conducive to producing the line of contact resistance in some parts
Road defective locations, temperature even more high.The time of enough continuous heatings is needed due to deicing processes, therefore in this condition
Under, it is heated for a long time equivalent to wire regional area, cause aluminium stock, steel characteristic of stock on circuit to be greatly lowered, such case
In the presence of the hidden danger for greatly threatening circuit military service safety, serious circuit collapse accident is easily caused.
In sum, although DC De-icing Scheme can solve the problems, such as line ice coating, circuit reliability reduction is also brought along
Problem.The present invention mainly carries out reasonably optimizing to existing DC De-icing Scheme, proposes a kind of pulse DC ice-melt scheme,
By pulse mode, periodically it is passed through DC current to solve concentration of local heating, causes asking for link performance Quality Down
Topic.
Using above-mentioned deicing device, icing circuit local pyrexia can be effectively solved the problems, such as, and icing line can be avoided
The phenomenon that ice on road is sublimated repeatedly, so as to substantially increase ice-melt efficiency, to a certain extent, is prevented from the performance of circuit
Decline, so as to ensure the long-term use of circuit.
Optionally, the 3rd time interval is spaced equal to the very first time；The present invention selects peak point current and low water
The reason for ordinary telegram stream, is, in deicing processes, if having been used up high-level electric current, heating temp is high, and ice-melt is fast, but meeting
Bring that some local non-uniform areas temperature are too high to cause the reduction of circuit mechanical property, while temperature is high to cause again solidifying again after distillation
China is unfavorable for ice-melt on the contrary.And low current caloric value is low, although guaranteed for line security, but efficiency is slow.Therefore, this hair
It is bright then to be reduced to low-level electric current and be incubated using carrying out heat production first with peak point current, then reach peak point current heat production
This periodicity pattern, local temperature is controlled, and ice-melt efficiency is also higher.
Time interval can be adjusted according to the condition of equipment or site operation, and time interval can be with different, but mistake
Fast increase electric current may cause impact of the peak point current to device line；Special shadow will not be also brought if the time is different
Ring or effect；Preferably, when the 3rd time interval will be equal with very first time interval, ice-melt effect preferably, is also convenient for operation
Easily remember during setting DC current generator.
Optionally, the 4th time interval is less than second time interval；One obtained by according to lot of experiments
Substantially it is worth, when the 4th time interval is less than the second time interval, readily satisfies ice-melt efficiency and control local temperature.Peak value
Electric current generates heat within a certain period of time, and this heat has an outside conductive process, if continuing through peak value electricity at this moment
Stream, the then heat for producing is former higher than the heat for conducting（Particularly one or more fasteners or iced insulator region high, form one
Individual insulated shell, temperature rise is very fast）, then local temperature will rapid increase, cause link performance to reduce.The present invention is in peak point current
Between set a low current buffer value, great heat will not be produced in the electric current in this stage, but will not allow circuit
Quick cooling under field conditions (factors) is gone down, while ensureing that peak point current produces heat outwards to conduct.
By taking LGJ240 steel-cored aluminium strands as an example：
It is electric from direct current is passed through when carrying out ice-melt operation for LGJ240 shaped steel core aluminum stranded wire circuits in icing below freezing
Stream scope be 400-800A, during being passed through using pulsed access, direct current since 0A, by the time of 1-300 seconds
Increase to peak point current（Peak point current refers to carry out maximum current when ice-melt is operated, generally 400-800A）, then at peak
Kept during value electric current 1-600 seconds, then by current reduction to below 400A within the time of 1-300 seconds, kept for 1-300 seconds.
Then increased electric current to peak point current in 1-300 seconds time again, kept for 1-600 seconds.Thus iterative cycles are carried out, until icing
Circuit reaches expectation ice-melt degree.
Research has shown that, after pulse direct current de-icing technology scheme, any position temperature rise of LGJ240 steel-cored aluminium strands is not
More than 70 DEG C, the device avoids the ice-melt layer of the regelation on the line of the steam after ice-melt, circuit surface from obtaining very completely
Good solution, that is, solve the problems, such as ice-melt, and the safety of circuit military service, integrity problem are solved again.
Under conditions of sleet, temperature -8 ~ -2 DEG C, certain LGJ240 test circuit covers ice layer thickness 8mm, using this
The deicing device of invention, determines peak point current 600A, is passed through direct current in 60 second time from 0A to 600A, is kept for 1200 seconds, so
Below 400A is dropped to from 600A in 60s afterwards, is kept for 1200 seconds, be raised to 600A in 60 seconds again.Thus it is circulated, 2 is small
When or so, and coordinate the slight vibrations of circuit can be deiced.Now, temperature is uniform everywhere for circuit, and each point detection temperature is super
90 DEG C are crossed, so as to avoid the problem of icing circuit local pyrexia.
When the deformation quantity of the icing circuit is judged, it is first determined the deformation of icing circuit circuit before non-icing
Amount, in deicing processes are carried out to icing circuit, installs the measuring instrument of measurement deformation quantity such that it is able in real time on icing circuit
The change of icing circuit deformation quantity is observed, when expectation ice-melt degree is reached, the shape measured by the deformation flowmeter
The deformation quantity of circuit of the variable before non-icing is allowed in the range of fluctuation.
In actual deicing processes, it is also possible to observed by human eye or video camera, it is found that icing starts on circuit
Fall, icing circuit takes place can be shaken, because icing circuit is shaken so as to further promote circuit to continue fall ice, Jin Erda
To desired ice-melt result.
Using ice melting system of the invention, the DC current being passed through can be automatically adjusted, so as to form pulse current so that
DC current gradually increases or is gradually reduced, and so as to reach the effect of ice-melt, and pulse current is not in persistent fever
Vapor and icing line after phenomenon, it is to avoid the problem of icing circuit local pyrexia, and the distillation caused by local pyrexia
Road surrounding environment is touched and sublimates into the problem that ice is attached on icing circuit again repeatedly.
In actual applications, the DC current generator outside can also mounting and adjusting knob；By adjusting knob to institute
State the DC current produced by DC current generator to be adjusted manually, pulse current is formed, so as to realize direct current
Current feedback circuit can not only automatically adjust but also can adjust to form pulse current manually, and then can select different modes of operation
It is more convenient that DC current generator is controlled.
The application using high current by icing circuit so that the heating of icing circuit and then promoting melting for ice on circuit
Change.In other words, DC current generator is just as a power supply, by wire needing the circuit of ice-melt part to form an electric current
Loop, after energization, on wire, the relation according to electric current and heat understands heat production to the function of current, so as to realize ice-melt.In actual behaviour
During work, having added and transmission line of electricity between at " DC current generator " can also add a pulse current and control
Device, the controller is controlled to the electric current of output in " DC current generator " so that output to the ice melting current on circuit
The pulse feature met in the present invention can be formed.
Current strength increases with the time, and the electric current of transmission line of electricity gradually increases or is gradually reduced, and then makes on transmission line of electricity
The heat of generation gradually increases or gradually decreases so that the icing of transmission line of electricity is gradually melted into water drippage, it is to avoid directly logical
Enter icing caused by constant dc first to distil the phenomenon sublimated freeze repeatedly again, solve and be passed through Constant Direct Current in the prior art
Electric ice-melt produced problem, improves ice-melt efficiency.Simultaneously because the temperature on transmission line of electricity is changed with the size of electric current
, also avoid the problem of icing circuit concentration of local heating, it is ensured that the stability of link performance.
Specific case used herein is set forth to principle of the invention and implementation method, and above example is said
It is bright to be only intended to help and understand device of the invention and its core concept；Simultaneously for those of ordinary skill in the art, foundation
Thought of the invention, will change in specific embodiments and applications.In sum, this specification content is not
It is interpreted as limitation of the present invention.
Claims (4)
1. a kind of deicing device that DC current is passed through to icing circuit, including：Icing circuit, DC current generating means and short
Road wiring, it is characterised in that：Described DC current generator is connected with pulse current generator controller；Pulse current occurs
The both positive and negative polarity of controller is connected with the both sides of described icing circuit one end, the both sides shortening contact of the other end of icing circuit.
2. a kind of deicing device that DC current is passed through to icing circuit according to claim 1, it is characterised in that described
DC current generating means include DC current generator and controller；Described controller is sent out installed in the DC current
Inside raw device.
3. a kind of deicing device that DC current is passed through to icing circuit according to claim 1, it is characterised in that described
DC current generator outside adjustment knob is installed.
4. a kind of deicing device that DC current is passed through to icing circuit according to claim 1,2, it is characterised in that institute
The DC current generating means power input stated is connected with external power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710132628.0A CN106856319A (en) | 2017-03-07 | 2017-03-07 | A kind of deicing device that DC current is passed through to icing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710132628.0A CN106856319A (en) | 2017-03-07 | 2017-03-07 | A kind of deicing device that DC current is passed through to icing circuit |
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| Publication Number | Publication Date |
|---|---|
| CN106856319A true CN106856319A (en) | 2017-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710132628.0A Pending CN106856319A (en) | 2017-03-07 | 2017-03-07 | A kind of deicing device that DC current is passed through to icing circuit |
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| CN (1) | CN106856319A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877265A (en) * | 2017-03-07 | 2017-06-20 | 贵州电网有限责任公司电力科学研究院 | A kind of de-icing method and device that DC current is passed through to icing circuit |
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| JPH0937448A (en) * | 1995-07-18 | 1997-02-07 | Nissin Electric Co Ltd | Snow-melting method of transmission line |
| CN101394073A (en) * | 2008-04-02 | 2009-03-25 | 广州普瑞电力控制系统设备有限公司 | Method and device for ice coating prevention and melt ice removing on electricity transmission and distribution line |
| CN201994673U (en) * | 2011-02-15 | 2011-09-28 | 贵州电网公司 | Switching virtual circuit (SVC) control system with direct-current ice melting function |
| CN103151746A (en) * | 2013-02-20 | 2013-06-12 | 浙江浙电经济技术研究院 | Internal recyclable ice melting method of composite overhead ground wire capable of melting ice |
| CN103378574A (en) * | 2012-04-25 | 2013-10-30 | 南京南瑞继保电气有限公司 | Control protection method for achieving deicing function of direct-current deicing device |
| CN206559010U (en) * | 2017-03-07 | 2017-10-13 | 贵州电网有限责任公司电力科学研究院 | A kind of deicing device that DC current is passed through to icing circuit |
-
2017
- 2017-03-07 CN CN201710132628.0A patent/CN106856319A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0937448A (en) * | 1995-07-18 | 1997-02-07 | Nissin Electric Co Ltd | Snow-melting method of transmission line |
| CN101394073A (en) * | 2008-04-02 | 2009-03-25 | 广州普瑞电力控制系统设备有限公司 | Method and device for ice coating prevention and melt ice removing on electricity transmission and distribution line |
| CN201994673U (en) * | 2011-02-15 | 2011-09-28 | 贵州电网公司 | Switching virtual circuit (SVC) control system with direct-current ice melting function |
| CN103378574A (en) * | 2012-04-25 | 2013-10-30 | 南京南瑞继保电气有限公司 | Control protection method for achieving deicing function of direct-current deicing device |
| CN103151746A (en) * | 2013-02-20 | 2013-06-12 | 浙江浙电经济技术研究院 | Internal recyclable ice melting method of composite overhead ground wire capable of melting ice |
| CN206559010U (en) * | 2017-03-07 | 2017-10-13 | 贵州电网有限责任公司电力科学研究院 | A kind of deicing device that DC current is passed through to icing circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877265A (en) * | 2017-03-07 | 2017-06-20 | 贵州电网有限责任公司电力科学研究院 | A kind of de-icing method and device that DC current is passed through to icing circuit |
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Application publication date: 20170616 |