CN106680641A - Simulation experiment apparatus utilizing DC-based de-icing technique for ice-coated line - Google Patents
Simulation experiment apparatus utilizing DC-based de-icing technique for ice-coated line Download PDFInfo
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- CN106680641A CN106680641A CN201710132326.3A CN201710132326A CN106680641A CN 106680641 A CN106680641 A CN 106680641A CN 201710132326 A CN201710132326 A CN 201710132326A CN 106680641 A CN106680641 A CN 106680641A
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- current
- ice
- icing
- direct current
- circuit
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- 238000000034 method Methods 0.000 title abstract description 17
- 238000004088 simulation Methods 0.000 title description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 30
- 239000004411 aluminium Substances 0.000 claims description 13
- 238000002474 experimental method Methods 0.000 claims description 10
- 238000004904 shortening Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 description 24
- 230000005540 biological transmission Effects 0.000 description 23
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 238000002844 melting Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 239000004020 conductor Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 206010037660 Pyrexia Diseases 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000027950 fever generation Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- 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 invention discloses a de-icing method and system enabling a direct current to access an ice-coated line. The method includes the following steps: determining the range of a direct current accessing an ice-coated line according to the specification of the line, and obtaining a peak value current; allowing the direct current to access the ice-coated line; increasing a current value of the direct current from zero to a current value of the peak value current after a first time interval; after the current value of the peak value current is maintained for a second time interval, reducing the current value of the peak value current within a third time interval, and obtaining a current value with a low level current; maintaining the current value with a low level current for a fourth time interval; determining whether the ice-coated line reaches an expected de-icing degree, and stopping inputting the direct current if the ice-coated line reaches the expected de-icing degree; and if the ice-coated line does not reach the expected de-icing degree, returning the step that increases the direct current from zero to the peak value current after the first time interval. The de-icing method and system can effectively improve the de-icing efficiency.
Description
Technical field
The present invention relates to DC ice melting field, it is more particularly to a kind of to icing circuit using pulse direct current ice-melt emulation
Experimental provision.
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 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
Mainly dc power is relied in the selection of the ice-melt operating parameter codes of DC current such as the current power for applying, persistent period
Substantially convert the de-icing technology code of a DC current with the resistivity of target line, and melting by related DC current
Ice experience is operated.It is -5 DEG C in ambient temperature such as conventional LGJ240 wires, during ice covering thickness 10mm, electric current choosing
More than 600A is selected, in 2.5h or so, has ice-melt to drop.
It should be noted 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 is passed 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, modeling occurs in the local that can cause 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, unidirectional current is flowed through
The resistance of the transmission line of electricity crossed is uneven.Steel-cored aluminium strand regional area process relaxes, and occurs contact electricity between aluminum 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 it is a kind of to icing circuit using pulse direct current ice-melt nature imitation experiment device, by reality
Freeze in testing to solve the problems, such as transmission line of electricity, so as to ensure the stability of link performance for a long time.
For achieving the above object, the invention provides following scheme：It is a kind of that pulse direct current ice-melt is adopted to icing circuit
Nature imitation experiment device, including：Icing circuit, DC current generating meanss, shortening contact, temperature element, temperature display unit, its
It is characterised by：Described DC current generator is connected with pulse current generator controller；Pulse current generator controller
Both positive and negative polarity 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 survey
Warm element is arranged on the steel-cored aluminium strand zones of different position of icing circuit, and temperature element outfan is input into temperature display unit
End connection.
Described DC current generating meanss include 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 meanss power input is connected with external power source.
Described temperature element is K-type thermocouple.
Described temperature display unit is number display type.
Compared with prior art the invention discloses following technique effect：The present invention is covered using the method for pulse current
Ice circuit thermal ice-melting is tested, and ice-melt effect is demonstrated substantially using test method, so as to avoid untested dress
The inadequate problem of practicality is put, the program is by electric current the increasing or decreasing in some cycles on transmission line of electricity, it is ensured that
Uniform and stable temperature range is maintained on circuit, on the one hand can prevent from being continually fed into constant dc and it is persistently overheating caused by cover
Ice 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；Separately
On the one hand stablizing for line temperature is met by the control increased and decreased current cycle, is prevented using circuit during constant current
Upper regional area persistent fever and cause temperature too high, so as to cause circuit mechanical property reduce problem.
Figure of description
Fig. 1 is embodiment of the present invention emulation technology assay device structure chart；
Fig. 2 positions the installation of TC schematic diagram 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 the embodiment of whole.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 1-2, it is an object of the invention to provide it is a kind of to icing circuit using pulse direct current ice-melt emulation reality
Experiment device, including：Icing circuit, DC current generating meanss, shortening contact, temperature element, temperature display unit, its feature exists
In：Described DC current generator is connected with pulse current generator controller；The both positive and negative polarity of pulse current generator controller
It 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 temperature element
Installed in the steel-cored aluminium strand zones of different position of icing circuit, temperature element outfan connects with temperature display unit input
Connect.
Described DC current generating meanss include 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 meanss power input is connected with external power source.
Described temperature element is K-type thermocouple.
Described temperature display unit is number display type.
Because the steel core in the steel-cored aluminium strand of power transmission and transformation line is cold drawn wire during test, aluminum stock is also cold-drawn aluminum
Stock, the cold drawn wire（Steel wire）With cold-drawn aluminum stock（Aluminum stock）The characteristics of belonging to cold-drawn metal, cold-drawn metal is by cold
Deformation and then reinforcing.In steel wire and aluminum stock, due to cold deformation, steel wire and aluminum stock produce substantial amounts of dislocation, the rising of dislocation density,
The yield strength and tensile strength of steel wire and aluminum stock are improve, under these conditions, the steel-cored aluminium strand of process is with higher
Maneuvering load.But, this cold deformation wire rod will recover, i.e., in uniform temperature after it experienced certain temperature
In the presence of the time, dislocation is recovered, and density is reduced, therefore its mechanical property can also occur significantly reduction.In some transmissions of electricity
In line out of service analysis report, under the conditions of abnormal service temperature, steel wire therein can be by normal condition for some steel-cored aluminium strands
Under 1500-1700MPa be reduced to 1000-1200MPa, aluminum stranded conductor can be reduced to 80MPa by 170MPa.In such condition
Under, during lasting military service, the weak link for beginning to be reduced from these performances starts to occur broken whole steel-cored aluminium strand
It is bad, ultimately result in fracture.After icing operation is completed, abnormal stranded, or even the report of broken string is occurred in that in some circuits,
Broken string region, steel wire significantly decreases with the intensity of aluminum stock.Particularly steel wire, regional area intensity can be dropped by 1600MPa
It is low for 1200MPa.
In the imitation technology that DC ice melting is carried out to icing circuit is tested, thermocouple is inserted into steel-cored aluminium strand
Zones of different carries out temperature survey.
As shown in Fig. 2 in the position of thermocouple, mainly aluminum stranded conductor surface, outer layer aluminum stranded conductor and internal layer aluminum stranded conductor line it
Between measure and aluminum stranded conductor and steel strand wires between.
By taking LGJ240 steel-cored aluminium strands as an example：
It is electric from unidirectional 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, unidirectional current from the beginning of 0A, through the time of 1-300 seconds
Increase to peak point current（Peak point current refers to the maximum current carried out when ice-melt is operated, generally 400-800A）, then at peak
Kept for the 1-600 seconds during value electric current, then by current reduction to below 400A within the time of 1-300 seconds, kept for the 1-300 seconds.
Then in 1-300 times second increase electric current to peak point current again, kept for the 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 method avoids completely the ice-melt layer of the regelation on the line of the steam after ice-melt, circuit surface from obtaining very
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 de-icing method of invention, determines peak point current 600A, is passed through unidirectional current 60 second time from 0A to 600A, is kept for 1200 seconds, so
Afterwards below 400A is dropped to from 600A in 60s, kept for 1200 seconds, be raised to 600A in 60 seconds again.Thus it is circulated, 2 is little
When or so, and coordinate the slight vibrations to circuit to deice.Now, everywhere temperature is uniform 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.
By the simulation test heated with logical dc point in -5 DEG C of icing environment of laboratory walk-in type environmental test chamber,
Different DC supply inputs are being carried out, the temperature in these three positions for installing thermocouple has notable difference.In actual ice-melt bar
Under part, maximally effective heating is the aluminum stranded conductor surface for directly contacting with ice in the position of thermocouple 1, and thermocouple 2, thermocouple 3
Point also can be generated heat due to the effect of electric current, therefore its heat for producing is internally, to need outwardly transfer of heat.But in direct current
During electricity is passed through, because the temperature difference between the wire of outer layer heating and the wire of internal layer heating is in fact less, do not exist larger
Thermograde, therefore the conduction output of internal heat is really very slow, and this results in the direct current in long-time by ice-melt
When electric, internal temperature more and more higher.And due to being mounted with the devices such as fixture, securing member on steel-cored aluminium strand, at these
Region with device, the ANOMALOUS VARIATIONS of resistivity so that the temperature contrast of diverse location is bigger.
Because unidirectional current ice-melt is main, most intuitively need to 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, often specific surface is taller 30-40 DEG C for internal temperature, in some steel-cored aluminium strand materials
Extremely uneven region, temperature may be close more than 150 DEG C, if being locally conducive to producing the line of contact resistance at some
Road defective locations, temperature even more high.Because deicing processes need the time of enough continuous heatings, therefore in this condition
Under, it is heated equivalent to wire regional area long-time, cause aluminum stock on circuit, steel characteristic of stock to be greatly lowered, such case
There is the hidden danger for greatly threatening circuit to be on active service safety, easily cause serious circuit collapse accident.
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.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For system disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
Specific case used herein is set forth to the principle and embodiment of the present invention, and above example is said
It is bright to be only intended to help and understand the method for the present invention and its core concept；Simultaneously for one of ordinary skill in the art, foundation
The thought of the present 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 (6)
1. it is a kind of to icing circuit using pulse direct current ice-melt nature imitation experiment device, including：Icing circuit, DC current occur
Device, shortening contact, temperature element, temperature display unit, it is characterised in that：Described DC current generator and pulse current
Generator controller is connected；The both positive and negative polarity of pulse current generator controller is connected with the both sides of described icing circuit one end, covers
The both sides shortening contact of the other end of ice circuit；Described temperature element is arranged on the steel-cored aluminium strand zones of different of icing circuit
Position, temperature element outfan is connected with temperature display unit input.
2. it is according to claim 1 it is a kind of to icing circuit using pulse direct current ice-melt nature imitation experiment device, its feature
It is that described DC current generating meanss include DC current generator and controller；Described controller is arranged on described
Inside DC current generator.
3. it is according to claim 1 it is a kind of to icing circuit using pulse direct current ice-melt nature imitation experiment device, its feature
It is that adjustment knob is installed outside described DC current generator.
4. according to claim 1,2 it is a kind of to icing circuit using pulse direct current ice-melt nature imitation experiment device, it is special
Levy and be, described DC current generating meanss power input is connected with external power source.
5. it is according to claim 1 it is a kind of to icing circuit using pulse direct current ice-melt nature imitation experiment device, its feature
It is that described temperature element is K-type thermocouple.
6. it is according to claim 1 it is a kind of to icing circuit using pulse direct current ice-melt nature imitation experiment device, its feature
It is that described temperature display unit is number display type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710132326.3A CN106680641A (en) | 2017-03-07 | 2017-03-07 | Simulation experiment apparatus utilizing DC-based de-icing technique for ice-coated line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710132326.3A CN106680641A (en) | 2017-03-07 | 2017-03-07 | Simulation experiment apparatus utilizing DC-based de-icing technique for ice-coated line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106680641A true CN106680641A (en) | 2017-05-17 |
Family
ID=58826381
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710132326.3A Pending CN106680641A (en) | 2017-03-07 | 2017-03-07 | Simulation experiment apparatus utilizing DC-based de-icing technique for ice-coated line |
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|---|---|---|---|---|
| CN101286629A (en) * | 2008-02-13 | 2008-10-15 | 郑卫东 | A device for covering surface of melting wires, poles and insulators in transmission line with ice |
| 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 |
| 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 |
| CN103186106A (en) * | 2011-12-28 | 2013-07-03 | 深圳市金威源科技股份有限公司 | High voltage direct current control switch |
| RU2569318C1 (en) * | 2014-08-14 | 2015-11-20 | федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Российский государственный политехнический университет (НПИ) имени М.И. Платова" | Method for melting ice on wires of overhead electric line |
| CN105182119A (en) * | 2015-08-31 | 2015-12-23 | 国网浙江省电力公司电力科学研究院 | Anti-icing current test method |
| CN206557312U (en) * | 2017-03-07 | 2017-10-13 | 贵州电网有限责任公司电力科学研究院 | It is a kind of to icing circuit use pulse direct current ice-melt nature imitation experiment device |
-
2017
- 2017-03-07 CN CN201710132326.3A patent/CN106680641A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101286629A (en) * | 2008-02-13 | 2008-10-15 | 郑卫东 | A device for covering surface of melting wires, poles and insulators in transmission line with ice |
| 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 |
| CN103186106A (en) * | 2011-12-28 | 2013-07-03 | 深圳市金威源科技股份有限公司 | High voltage direct current control switch |
| 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 |
| RU2569318C1 (en) * | 2014-08-14 | 2015-11-20 | федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Российский государственный политехнический университет (НПИ) имени М.И. Платова" | Method for melting ice on wires of overhead electric line |
| CN105182119A (en) * | 2015-08-31 | 2015-12-23 | 国网浙江省电力公司电力科学研究院 | Anti-icing current test method |
| CN206557312U (en) * | 2017-03-07 | 2017-10-13 | 贵州电网有限责任公司电力科学研究院 | It is a kind of to icing circuit use pulse direct current ice-melt nature imitation experiment device |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170517 |
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