CN106877265B - A kind of de-icing method and device being passed through DC current to icing circuit - Google Patents
A kind of de-icing method and device being passed through DC current to icing circuit Download PDFInfo
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- CN106877265B CN106877265B CN201710132308.5A CN201710132308A CN106877265B CN 106877265 B CN106877265 B CN 106877265B CN 201710132308 A CN201710132308 A CN 201710132308A CN 106877265 B CN106877265 B CN 106877265B
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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 de-icing method and device being passed through DC current to icing circuit, and this method includes：The current range that the DC current being passed through is determined according to the specification of icing circuit, obtains peak point current；It is passed through DC current to icing circuit；The current value of the DC current is increased to from zero after first time interval to the current value of the peak point current；After the current value of the peak point current is kept the second time interval, the current value of the peak point current is reduced in third time interval, obtains the current value of low-level electric current；The current value of the low-level electric current is kept into the 4th time interval；Judge whether the icing circuit reaches desired ice-melt degree, if so, being no longer passed through DC current；If it is not, then return it is described by DC current from zero increase to after first time interval the peak point current the step of.De-icing method and device using the present invention can effectively improve ice-melt efficiency.
Description
Technical field
The present invention relates to DC ice melting fields, more particularly to a kind of de-icing method being passed through DC current to icing circuit
And device.
Background technology
DC ice melting mainly by applying DC voltage to transmission line of electricity and carrying out short circuit in transmission line of electricity end, makes to lead
Line fever carries out ice-melt to transmission line of electricity, to avoid circuit rod disconnection due to icing.The principle of DC ice melting technology is exactly
Using icing circuit as load, apply DC power supply, providing short circuit current heating wires with low voltage makes icing melt.But it is right
Dc power is mainly relied in the selection of the current power of application, the ice-melt operating parameter regulation of the DC currents such as duration
With the resistivity of target line come the de-icing technology regulation for the DC current that substantially converts, and melting by related DC current
Ice experience is operated.It is -5 DEG C in environment temperature such as common LGJ240 conducting wires, when ice covering thickness 10mm, electric current choosing
600A or more is selected, in 2.5h or so, has ice-melt to fall.
It is worth noting that, when icing circuit is passed through DC current progress ice-melt, the temperature on transmission line of electricity is not equal
Even.The reason of leading to non-uniform temperature, has：One, the line footpath for the transmission line of electricity that DC current passes through is uneven.On transmission line of electricity
There are circuit crimping joints or shockproof gold utensil etc. to be connected to the device on transmission line of electricity, and the part of transmission line of electricity can be made to mould
Property deformation, cause the line footpath of transmission line of electricity uneven, and then cause the non-uniform temperature on transmission line of electricity.Two, DC current passes through
The resistance for 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 causes the zone resistance that process relaxes in DC ice melting operating process higher, therefore the process when being passed through constant electric current
The temperature in loose region is also higher, makes the non-uniform temperature of transmission line of electricity.It is above-mentioned and under the action of Constant Direct Current electric current
The temperature of the regional area of transmission line of electricity is far above the mean temperature of transmission line of electricity（Calculate temperature）, then 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 encountering
Ambient temperature when, vapor can again sublimate on outer layer icing, in cycles, will substantially reduce DC ice melting efficiency,
The a large amount of icing being consequently formed seriously affect the safety of transmission line of electricity and steel tower；It also will appear transmission line of electricity concentration of local hair simultaneously
The problem of heat, causes the performance of transmission line of electricity to decline.
Invention content
The object of the present invention is to provide a kind of de-icing methods and device being passed through DC current to icing circuit, to solve office
Portion concentrates the problem of fever, to ensure the stability of link performance for a long time.
To achieve the above object, the present invention provides following schemes：
A kind of de-icing method being passed through DC current to icing circuit, including：
The current range that the DC current being passed through is determined according to the specification of icing circuit, obtains peak point current；
It is passed through DC current to icing circuit；
The current value of the DC current is increased to from zero after first time interval to the electric current of the peak point current
Value；
After the current value of the peak point current is kept the second time interval, by the current value of the peak point current in third
It is reduced in time interval, obtains the current value of low-level electric current；
The current value of the low-level electric current is kept into the 4th time interval；
Judge whether the icing circuit reaches desired ice-melt degree, obtains the first judging result；
If first judging result be expressed as the icing circuit not up to it is expected ice-melt degree, return it is described will be straight
Galvanic electricity stream from zero increase to after first time interval the peak point current the step of.
Optionally, the third time interval is equal to the first time interval.
Optionally, the 4th time interval is less than second time interval.
Optionally, described to judge whether the icing circuit reaches desired ice-melt degree, it specifically includes：
Whether within a preset range the deformation quantity for judging the icing circuit, obtains the second judging result；
If second judging result is expressed as the deformation quantity of the icing circuit within a preset range, it is determined that described to cover
Ice circuit reaches desired ice-melt degree.
Optionally, described to judge whether the icing circuit reaches desired ice-melt degree, it specifically includes：
Judge that the diameter of the icing circuit whether in the diameter range of regular link, obtains third judging result；Institute
The diameter range of regular link is stated as the diameter range of the transmission line of electricity of no icing；
The third judging result is expressed as the diameter of the icing circuit in the diameter range of regular link, it is determined that
The icing circuit reaches desired ice-melt degree.
A kind of deicing device being passed through DC current to icing circuit, including：
Peak point current acquisition module, the current range for determining the DC current being passed through according to the specification of icing circuit,
Obtain peak point current；
DC current increases module, for increasing the current value of the DC current after first time interval from zero
To the current value of the peak point current；
Low-level electric current acquisition module, after the current value of the peak point current is kept the second time interval, by institute
State the current value of peak point current reduces in third time interval, obtains the current value of low-level electric current；
Low-level electric current keeps module, for the current value of the low-level electric current to be kept the 4th time interval；
First judgment module obtains the first judgement knot for judging whether the icing circuit reaches desired ice-melt degree
Fruit；
Circulate operation module, if being expressed as the icing circuit for first judging result not up to it is expected ice-melt journey
Degree, then return increases to the peak point current from zero by DC current after first time interval, carries out circulate operation.
A kind of deicing device being passed through DC current to icing circuit, a kind of ice-melt being passed through DC current to icing circuit
Device, including：Icing circuit, DC current generating means and shortening contact, it is characterised in that：The DC current generator
It is connected with pulse current generator controller；The both sides of the positive and negative anodes of pulse current generator controller and icing circuit one end
It is connected, the both sides shortening contact of the other end of icing circuit.
The DC current generating means includes DC current generator and controller；The controller is mounted on institute
It states inside DC current generator.
The controller is used for：
The current range that the DC current being passed through is determined according to the specification of icing circuit, obtains peak point current；
It is passed through DC current to icing circuit；
The current value of the DC current is increased to from zero after first time interval to the electric current of the peak point current
Value；
After the current value of the peak point current is kept the second time interval, by the current value of the peak point current in third
It is reduced in time interval, obtains the current value of low-level electric current；
The current value of the low-level electric current is kept into the 4th time interval；
Judge whether the icing circuit reaches desired ice-melt degree, obtains the first judging result；
If first judging result, which is expressed as the icing circuit, not up to it is expected ice-melt degree, return direct current
Increase to the peak point current after first time interval from zero, carries out circulate operation.
According to specific embodiment provided by the invention, the invention discloses following technique effects：The present invention is using pulse electricity
The method of stream carries out icing circuit thermal ice-melting, the program by transmission line of electricity increasing of the electric current in some cycles add deduct
It is few, it ensure that the temperature range for remaining uniform and stable on circuit, on the one hand can prevent from being continually fed into constant dc and lasting liter
Icing caused by temperature first distils icing phenomenon repeatedly of sublimating again so that the icing of transmission line of electricity is gradually melted into water drippage, improves
Ice-melt efficiency；On the other hand the stabilization of line temperature is met by the control increased and decreased current cycle, prevented using permanent
When constant current on circuit regional area persistent fever and cause temperature excessively high, to cause circuit mechanical property reduce the problem of.
Description of the drawings
Detail view of the thermocouple in steel-cored aluminium strand during Fig. 1 tests for emulation technology of the embodiment of the present invention；
Fig. 2 is de-icing method flow chart of the embodiment of the present invention；
Fig. 3 is deicing device structure chart of the embodiment of the present invention；
Fig. 4 is the practical deicing device structure chart of the embodiment of the present invention；
Fig. 5 m- current strength curve waveform figures when being the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figs. 1-5, the object of the present invention is to provide it is a kind of to icing circuit be passed through DC current de-icing method and
System to improve the ice-melt efficiency to icing circuit, and solves the problems, such as that concentration of local is generated heat, to ensure circuit for a long time
The stability of energy.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Since 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）Belong to cold-drawn metal, the characteristics of cold-drawn metal is by cold deformation
Strengthen.In steel wire and aluminium stock, due to cold deformation, steel wire and aluminium stock generate a large amount of dislocation, and the rising of dislocation density improves steel
There is higher use to carry for the yield strength and tensile strength of silk and aluminium stock, under these conditions, the steel-cored aluminium strand of process
Lotus.But this cold deformation wire rod will restore after it experienced certain temperature, i.e., in certain temperature and time
Under effect, dislocation is restored, and density reduces, therefore its mechanical property can also occur significantly to reduce.It fails in some transmission lines of electricity
In analysis report, some steel-cored aluminium strands are under the conditions of abnormal service temperature, steel wire therein, can be by under normal condition
1500-1700MPa is reduced to 1000-1200MPa, and aluminum stranded conductor can be reduced to 80MPa by 170MPa.In such a situa-tion, whole
A steel-cored aluminium strand begins to destroy since the weak link of these reduced performances, most during lasting military service
Cause to be broken eventually.After completing icing operation, occurs abnormal report that is stranded, or even breaking in some circuits, breaking
The intensity in region, steel wire and aluminium stock significantly decreases.Especially steel wire, regional area intensity can be reduced to by 1600MPa
1200MPa。
In the imitation technology experiment for carrying out DC ice melting to icing circuit, twisted by the way that thermocouple is inserted into steel-core-aluminium
The different zones of line are measured into trip temperature.
Fig. 1 be emulation technology of the embodiment of the present invention experiment in thermocouple steel-cored aluminium strand detail view, as shown in Figure 1,
In the position of thermocouple, mainly twisted with 3 aluminum stranded conductors and steel between 1 aluminum stranded conductor surface, 2 outer layer aluminum stranded conductors and internal layer aluminum stranded conductor line
It is measured between line.
Pass through the simulation test heated in -5 DEG C of icing environment of laboratory walk-in type environmental test chamber and logical dc point
Middle discovery, when carrying out different DC supply inputs, the temperature in 1,2,3 these three positions has notable difference.In practical ice-melt
Under the conditions of, most effective fever is the aluminum stranded conductor surface directly contacted with ice in 1 position, and 2,3 points of effects due to electric current
Also it can generate heat, therefore its heat generated is to need outwardly transfer of heat in inside.But during direct current is passed through, by
The temperature difference between the conducting wire and the conducting wire of internal layer fever of outer layer fever is in fact smaller, larger temperature gradient is not present, therefore
The conduction output of internal heat is really very slow, this is resulted in direct current of the long-time by ice-melt, internal temperature
It is higher and higher.And due to being mounted with the devices such as fixture, fastener on steel-cored aluminium strand, in these regions with device,
The anomalous variation of resistivity so that the temperature difference bigger of different location.
It is most intuitive to need to be to realize that temperature rises in circuit surface to carry out melted surface icing since direct current ice-melt is main,
Therefore the direct current power inputted in many cases, duration make surface temperature rise reach 50-70 DEG C of temperature, start
Gradually when leading to the fusing of icing layer, internal temperature often taller 30-40 DEG C of specific surface, in some steel-cored aluminium strand material poles
Hold non-uniform region, temperature may be close to 150 DEG C or more, if being conducive to generate the circuit of contact resistance in some parts
Defective locations, temperature are even higher.Since deicing processes need the time of enough continuous heatings, under these conditions,
It is equivalent to conducting wire regional area to be heated for a long time, causes aluminium stock on circuit, steel characteristic of stock that can be greatly lowered, such case exists
The hidden danger for greatly threatening circuit military service safety, be easy to cause serious circuit collapse accident.
In conclusion although DC De-icing Scheme can solve the problems, such as transmission line icing, circuit reliability reduction is also brought along
The problem of.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, it is periodically passed through DC current, to solve concentration of local fever, leads to asking for link performance quality decline
Topic.
Fig. 2 is de-icing method flow chart of the embodiment of the present invention, as shown in Fig. 2, a kind of being passed through DC current to icing circuit
De-icing method, including：
Step 401：The current range that the DC current being passed through is determined according to the specification of icing circuit, obtains peak point current；
Such as common LGJ240 conducting wires are passed through when environment temperature is -5 DEG C, and the ice covering thickness on icing circuit is 10mm
DC current selects between 400A-800A ranges, and 2.5 hours or so, the icing of transmission line of electricity can gradually be melted into water
Drippage；
Step 402：It is passed through DC current to icing circuit；
Step 403：The current value of the DC current is increased into the peak value electricity from zero after first time interval
The current value of stream；
Step 404：After the current value of the peak point current is kept the second time interval, by the electric current of the peak point current
Value reduces in third time interval, obtains the current value of low-level electric current；
Step 405：The current value of the low-level electric current is kept into the 4th time interval；In through the above steps repeatedly
The current value size for adjusting DC current, make by the electric current of transmission line of electricity gradually increase or be gradually reduced, and then make transmission of electricity
The heat generated on circuit is gradually increased or is gradually decreased；
Step 406：Judge whether the icing circuit reaches desired ice-melt degree, if so, step 407 is executed, if it is not, returning
Return step 403；
Step 407：DC current generator is closed, does not continue to be passed through DC current.
Using above-mentioned de-icing method, icing circuit local pyrexia can be effectively solved the problems, such as, and icing line can be avoided
The phenomenon that ice of road is sublimated repeatedly to a certain extent, can prevent the performance of circuit to substantially increase ice-melt efficiency
Decline, to ensure the long-time service of circuit.
Optionally, the third time interval is equal to the first time interval；The present invention selects peak point current and low water
The reason of ordinary telegram stream, is, in deicing processes, if using high-level electric current always, heating temperature is high, and ice-melt is fast, but meeting
Bring some local non-uniform areas temperature are excessively high to lead to the reduction of circuit mechanical property, while temperature height causes to coagulate again again after distilling
China is unfavorable for ice-melt instead.And low current calorific value is low, although guaranteed for line security, efficiency is slow.Therefore, this hair
It is bright to carry out heat production using first with peak point current, then be reduced to low-level electric current and kept the temperature, then reach peak point current heat production
This periodicity pattern, local temperature are controlled, and ice-melt efficiency is also relatively high.
Time interval can be adjusted according to the condition of equipment or site operation, and time interval can be different, but mistake
Fast increase electric current may lead to impact of the peak point current to device line；Special shadow will not be brought if the time is different
Sound or effect；Preferably, when third time interval will be equal with first time interval, ice-melt effect is best, is also convenient for operating
It is easy memory when setting DC current generator.
Optionally, the 4th time interval is less than second time interval；Obtained one according to a large number 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 produces heat within a certain period of time, this heat has an outside conductive process, at this moment if continuing through peak value electricity
Stream, then the heat original generated are higher than the heat conducted（The especially high region of one or more fasteners or iced insulator forms one
A insulated shell, temperature rise 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, not will produce great heat in the electric current in this stage, but will not allow circuit
It is quickly cooled down down under field conditions (factors), while ensureing that peak point current generates heat and conducts outward.
By taking LGJ240 steel-cored aluminium strands as an example：
For LGJ240 shaped steel core aluminum stranded wire circuits in icing below freezing, when carrying out ice-melt operation, selection is passed through direct current
Electric current range is 400-800A, is accessed using pulsed during being passed through, direct current was since 0A, by 1-300 seconds
Time increases to peak point current（Peak point current refers to maximum current when carrying out ice-melt operation, generally 400-800A）, then
Keep 1-600 seconds during peak point current, then within 1-300 seconds time by current reduction to 400A hereinafter, keeping 1-300
Second.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 desired ice-melt degree.
Research has shown that, after pulse direct current de-icing technology scheme, any position Wen Shengjun of LGJ240 steel-cored aluminium strands is not
More than 70 DEG C, this method avoids the regelation of steam on the line after ice-melt, the ice-melt layer of circuit surface from obtaining very completely
Good solution, that is, solve the problems, such as ice-melt, and solves the safety of circuit military service, integrity problem.
Under conditions of sleet, temperature -8 ~ -2 DEG C, certain LGJ240 test circuit, icing layer thickness 8mm, using this
The de-icing method of invention determines peak point current 600A, is passed through direct current in 60 second time from 0A to 600A, holding 1200 seconds, so
400A is dropped to from 600A hereinafter, being kept for 1200 seconds, be raised to 600A in 60 seconds again in 60s afterwards.Thus it is recycled, 2 is small
When or so, and cooperation can deice the slight vibrations of circuit.At this point, temperature is uniform everywhere for circuit, it is super that each point, which detects temperature,
90 DEG C are crossed, the problem of so as to avoid icing circuit local pyrexia.
Optionally, described to judge whether the icing circuit reaches desired ice-melt degree, it specifically includes：
Whether within a preset range the deformation quantity for judging the icing circuit, obtains the second judging result；
If second judging result is expressed as the deformation quantity of the icing circuit within a preset range, it is determined that described to cover
Ice circuit reaches desired ice-melt degree.
When judging the deformation quantity of the icing circuit, it is first determined the deformation of icing circuit circuit before non-icing
Amount, in carrying out deicing processes to icing circuit, the measuring instrument of installation measurement deformation quantity on icing circuit, so as to real-time
The variation for observing icing circuit deformation quantity, when reaching desired ice-melt degree, the shape measured by the deformation flowmeter
In the range of the deformation quantity of circuit of the variable before non-icing allows fluctuation.
Optionally, described to judge whether the icing circuit reaches desired ice-melt degree, it specifically includes：
Judge that the diameter of the icing circuit whether in the diameter range of regular link, obtains third judging result；Institute
The diameter range of regular link is stated as the diameter range of the transmission line of electricity of no icing；
The third judging result is expressed as the diameter of the icing circuit in the diameter range of regular link, it is determined that
The icing circuit reaches desired ice-melt degree.
When judging the diameter of the icing circuit, it is first determined the diameter of icing circuit circuit before non-icing,
Icing circuit is carried out in deicing processes, the measuring instrument of installation measurement diametral distance on icing circuit, so as to see in real time
The variation for measuring icing line diameters distance, when reaching desired ice-melt degree, measured by the diametral distance measuring instrument
In the range of the diametral distance of circuit of the diametral distance before non-icing allows fluctuation.
It in practical deicing processes, can also be observed by human eye or video camera, it is found that icing starts on circuit
It falls, icing circuit, which takes place, to be shaken, since icing circuit is shaken further circuit to be promoted to continue fall ice, Jin Erda
To desired ice-melt result.
Fig. 3 is deicing device structure chart of the embodiment of the present invention, as shown in figure 3, a kind of being passed through DC current to icing circuit
Deicing device, including：
Peak point current acquisition module 501, the electric current model for determining the DC current being passed through according to the specification of icing circuit
It encloses, obtains peak point current；
DC current increases module 502, is used for the current value of the DC current from zero after first time interval
Increase to the current value of the peak point current；
Low-level electric current acquisition module 503 will after the current value of the peak point current is kept the second time interval
The current value of the peak point current reduces in third time interval, obtains the current value of low-level electric current；
Low-level electric current keeps module 504, for the current value of the low-level electric current to be kept the 4th time interval；
First judgment module 505 obtains the first judgement for judging whether the icing circuit reaches desired ice-melt degree
As a result；
Circulate operation module 506 not up to it is expected to melt if being expressed as the icing circuit for first judging result
Ice degree, then return increases to the peak point current from zero by DC current after first time interval, carries out circulate operation.
Deicing device using the present invention can automatically adjust the DC current being passed through, to form pulse current so that
DC current is gradually increased or is gradually reduced, and to achieve the effect that ice-melt, and pulse current is not in persistent fever
Phenomenon, the problem of avoiding icing circuit local pyrexia, and the vapor after distilling caused by local pyrexia and icing line
Road ambient enviroment touches and sublimates into the problem that ice is attached to again on icing circuit repeatedly.
In the prior art, DC current generating means can only carry out manual adjustment at the scene according to actual demand, due to
There are many security risks for actual environment, to be not suitable for manually carrying out Field adjustment at certain moment.Therefore, the present invention discloses
A kind of DC current generating means, including：DC current generator, controller；
The controller is mounted on inside the DC current generator；
The controller is used for：The current range that the DC current being passed through is determined according to the specification of icing circuit, obtains peak
It is worth electric current；It is passed through DC current to icing circuit；The current value of the DC current is increased from zero after first time interval
It is added to the current value of the peak point current；After the current value of the peak point current is kept the second time interval, by the peak value
The current value of electric current reduces in third time interval, obtains the current value of low-level electric current；By the electricity of the low-level electric current
Flow valuve keeps the 4th time interval；Judge whether the icing circuit reaches desired ice-melt degree, if so, no longer to icing line
Road is passed through pulse current, if it is not, return increases to the peak point current from zero by direct current after first time interval, carries out
Circulate operation.
It in practical applications, can also mounting and adjusting knob outside the DC current generator；By adjusting knob to institute
It states DC current caused by DC current generator to be adjusted manually, pulse current is formed, 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.
Fig. 4 is the practical deicing device structure chart of the embodiment of the present invention, and specific connection type is as shown in figure 4, DC current is sent out
Raw device is connected with pulse current generator controller；The positive and negative anodes of pulse current generator controller and icing circuit one end
Both sides are connected, the both sides shortening contact of the other end of icing circuit, and the application uses high current by icing circuit, to make
Obtain the thawing that icing circuit generates heat and then promotes ice on circuit.In other words, DC current generator is just as a power supply, by leading
Bundle of lines needs the circuit of ice-melt part to form a current loop, and after energization, the function of current is on conducting wire, according to electric current and heat
Relationship can heat production, to realize ice-melt.In actual mechanical process, add between transmission line of electricity at " DC current generator "
A pulse current generator controller can also be added, which carries out the electric current exported in " DC current generator "
Control so that the ice melting current being output on circuit can form the pulse feature met in the present invention.
Fig. 5 m- current strength curve waveform figures when being the embodiment of the present invention, as shown in figure 5, current strength increases at any time
Add, the electric current of transmission line of electricity is gradually increased or is gradually reduced, and then the heat generated on transmission line of electricity is made to gradually increase or gradually
It reduces so that the icing of transmission line of electricity is gradually melted into water drippage, and it is first to avoid icing caused by being passed directly into constant dc
Distil the phenomenon that freezing repeatedly of sublimating again, solves and is passed through the constant dc ice-melt problem in the prior art, improves
Ice-melt efficiency.Simultaneously because the temperature on transmission line of electricity is changed with the size of electric current, icing circuit office is also avoided
Portion concentrates the problem of fever, ensure that the stability of link performance.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For system disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part
It is bright.
Principle and implementation of the present invention are described for specific case used herein, and above example is said
The bright method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (5)
1. a kind of de-icing method being passed through DC current to icing circuit, which is characterized in that including：According to the specification of icing circuit
The current range for determining the DC current being passed through, obtains peak point current；It is passed through DC current to icing circuit；By the direct current
The current value of stream increases to the current value of the peak point current from zero after first time interval；By the electricity of the peak point current
After flow valuve keeps the second time interval, the current value of the peak point current is reduced in third time interval, obtains low-level
The current value of electric current；The current value of the low-level electric current is kept into the 4th time interval；Heat production is carried out using peak point current, then
It is reduced to low-level electric current to be kept the temperature, then reaches peak point current heat production, to control local temperature；
Judge whether the icing circuit reaches desired ice-melt degree, obtains the first judging result；
If first judging result, which is expressed as the icing circuit, not up to it is expected ice-melt degree, return described by direct current
Stream from zero increase to after first time interval the peak point current the step of.
2. de-icing method according to claim 1, which is characterized in that the third time interval is equal to the first time
Interval.
3. de-icing method according to claim 1, which is characterized in that the 4th time interval is less than second time
Interval.
4. de-icing method according to claim 1, which is characterized in that described to judge whether the icing circuit reaches expectation
Ice-melt degree, specifically includes：Whether within a preset range the deformation quantity for judging the icing circuit, obtains the second judging result；
If second judging result is expressed as the deformation quantity of the icing circuit within a preset range, it is determined that the icing circuit reaches
To desired ice-melt degree.
5. de-icing method according to claim 1, which is characterized in that described to judge whether the icing circuit reaches expectation
Ice-melt degree, specifically includes：Judge that the diameter of the icing circuit whether in the diameter range of regular link, obtains third and sentences
Disconnected result；The diameter range of the regular link for the transmission line of electricity of no icing diameter range；The third judging result table
The diameter of the icing circuit is shown as in the diameter range of regular link, it is determined that the icing circuit reaches desired ice-melt journey
Degree.
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| CN109449852B (en) * | 2018-03-23 | 2021-01-26 | 国网浙江省电力公司丽水供电公司 | Distribution line ice melting method in non-power-loss mode |
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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 |
| CN102208792B (en) * | 2011-03-10 | 2015-05-13 | 中国电力科学研究院 | System debug method of movable type direct current ice melting apparatus based on gate turn-off (GTO) device |
| CN102545125A (en) * | 2012-02-08 | 2012-07-04 | 湖南省电力公司科学研究院 | Movable aerial earth wire direct current ice melting system |
| 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 |
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| CN204479717U (en) * | 2015-04-10 | 2015-07-15 | 国家电网公司 | Extra-high voltage ice-melt disconnector heavy current tester |
| CN105911375B (en) * | 2016-03-22 | 2018-06-15 | 国网江西省电力有限公司电力科学研究院 | A kind of test method of distribution line icing critical current properties |
| 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 |
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