CN111130043A - OPGW overhead ground wire ice melting control system and method based on optical fiber monitoring - Google Patents

OPGW overhead ground wire ice melting control system and method based on optical fiber monitoring Download PDF

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Publication number
CN111130043A
CN111130043A CN201911261932.0A CN201911261932A CN111130043A CN 111130043 A CN111130043 A CN 111130043A CN 201911261932 A CN201911261932 A CN 201911261932A CN 111130043 A CN111130043 A CN 111130043A
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CN
China
Prior art keywords
ice
melting
monitoring
ground wire
overhead ground
Prior art date
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.)
Pending
Application number
CN201911261932.0A
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Chinese (zh)
Inventor
朱一峰
田霖
袁华璐
刘淼
茹正辉
陆国生
陈保豪
李任新
张祥
杨建新
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong South Electric Power Communication Co ltd
Extra High Voltage Power Transmission Co
Original Assignee
Guangdong South Electric Power Communication Co ltd
Extra High Voltage Power Transmission Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guangdong South Electric Power Communication Co ltd, Extra High Voltage Power Transmission Co filed Critical Guangdong South Electric Power Communication Co ltd
Priority to CN201911261932.0A priority Critical patent/CN111130043A/en
Publication of CN111130043A publication Critical patent/CN111130043A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00Overhead installations of electric lines or cables
    • H02G7/16Devices for removing snow or ice from lines or cables

Abstract

The invention relates to the field of power monitoring, and discloses an OPGW overhead ground wire ice-melting control system and method based on optical fiber monitoring. The invention ensures effective ice melting of the power transmission line and no damage to the lead in the ice melting process, provides necessary guarantee for quick and effective ice melting of the power grid, and can ensure the safety of the OPGW line in the ice melting process and realize comprehensive ice melting.

Description

OPGW overhead ground wire ice melting control system and method based on optical fiber monitoring
Technical Field
The invention relates to the field of power monitoring, in particular to an OPGW overhead ground wire ice melting control system and method based on optical fiber monitoring.
Background
The transmission line is an important device for electric energy transmission and plays an important role in the intelligent process of a power grid. The transmission line is affected by weather such as low-temperature freezing, so that the icing phenomenon is very serious, and serious consequences such as line breakage, tower collapse and the like of the transmission line can be caused. Therefore, the development of online monitoring of the running environment of the power transmission line containing the OPGW (optical fiber composite overhead ground wire) and the ice coating state information becomes an important measure for ensuring the safe and stable running of the whole power grid. The direct-current ice melting method adopted by the power transmission line has the advantages of high ice melting speed, good ice melting effect and the like. In the ice melting process, if the ice melting current is too small, the ice melting effect cannot be achieved, and if the ice melting current is too large, the transmission line or the OPGW is damaged, the communication is interrupted accidentally, and potential safety hazards exist. At present, in the aspect of ice melting monitoring of the OPGW, a distributed optical fiber temperature measurement technology is mainly adopted, real-time, online and continuous temperature measurement is realized based on an optical fiber Raman scattering phenomenon and optical time domain reflection, and the method can realize temperature monitoring during ice melting of an OPGW line. Because the temperature of the power transmission line is required to be higher than the critical ice melting temperature and not to exceed the allowable temperature of the line in the ice melting process, how to judge the ice melting state and control the ice melting current by using the monitored temperature data does not have a good solution at present.
Therefore, most of the existing monitoring control methods utilize temperature monitoring data, the size of the ice melting current is adjusted by experience, and no controllable and effective identification and control method exists. In the ice melting process, how to ensure that the ice melting current performs ice melting in an effective range so as to achieve the ice melting effect of the OPGW and ensure the safety of the line does not exist, and at present, an effective solution is not available. The ice coating degree of the OPGW is different, and the uniformity of the ice coating of the line is difficult to guarantee during ice melting, so that the conditions that the part of the line is de-iced and the part of the line is still coated with ice exist, the ice melting is stopped after the part of the line is de-iced, and the ice melting comprehensiveness of the OPGW line cannot be guaranteed.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides the OPGW overhead ground wire ice melting control system and method based on optical fiber monitoring, which can ensure the effective ice melting of the power transmission line, ensure no damage to the wires in the ice melting process, provide necessary guarantee for the quick and effective ice melting of the power grid, ensure the safety of the OPGW line in the ice melting process and realize the comprehensive ice melting.
The technical scheme adopted by the invention for solving the technical problems is as follows: an OPGW overhead ground wire ice-melting control system based on optical fiber monitoring is constructed, and comprises an OPGW overhead ground wire, an optical fiber splice closure, an ice-melting monitoring system, an ice-coating monitoring system, an ice-melting control device and an ice-melting device, wherein the optical fiber splice closure is connected with the OPGW overhead ground wire through an optical fiber, the ice-melting monitoring system is connected with the optical fiber splice closure through an optical fiber and used for monitoring the temperature data of the OPGW overhead ground wire in the ice-melting process and feeding back the temperature data to the ice-coating monitoring system, the ice-coating monitoring system is connected with the ice-melting monitoring system and used for monitoring the ice-coating state of the OPGW overhead ground wire, calculating the ice-coating condition of the OPGW overhead ground wire, further judging and identifying the ice-melting state, corresponding to different ice-melting current control schemes according to different ice-melting states, and the ice-coating monitoring system collects data through, the ice melting control device is connected with the ice coating monitoring system and used for controlling ice melting current, the ice melting device is connected with the ice melting control device and used for carrying out direct current ice melting on the OPGW overhead ground wire, and the ice melting device is also connected with the OPGW overhead ground wire through an ice melting wire.
In the OPGW overhead ground wire ice melting control system based on optical fiber monitoring, the ice melting state comprises an initial ice melting stage, an ice melting time stage, a partial ice removing stage and a full ice removing stage.
In the OPGW overhead ground wire ice melting control system based on optical fiber monitoring, the temperature data monitored by the ice melting monitoring system rises linearly when ice melting current is introduced into the OPGW overhead ground wire in the initial stage of ice melting.
In the OPGW overhead ground wire ice melting control system based on optical fiber monitoring, the OPGW overhead ground wire reaches a thermal balance when the temperature rises slowly and tends to a stable value in the ice melting process stage.
In the OPGW overhead ground wire ice melting control system based on optical fiber monitoring, the temperature data has the characteristic of rising before and after the coated ice on the OPGW overhead ground wire falls off in the partial ice-removing stage.
In the OPGW overhead ground wire deicing control system based on optical fiber monitoring, in the comprehensive deicing stage, when the OPGW overhead ground wire finishes deicing, the collected temperature data on the OPGW overhead ground wire are uniform and tend to be stable, and the deicing is finished at the moment.
The invention also relates to an OPGW overhead ground wire ice melting control method based on optical fiber monitoring, which is applied to the OPGW overhead ground wire ice melting control system based on optical fiber monitoring and comprises the following steps:
A) starting an icing monitoring system;
B) calculating the ice-melting current according to the ice coating degree;
C) starting ice melting;
D) setting the ice melting current to be I;
E) starting the ice melting device and the ice melting monitoring system;
F) setting the monitoring length of the OPGW overhead ground wire as L, judging whether the sum of the temperature mutation distances is less than 30% L, and if so, executing the step G); otherwise, executing step H);
G) keeping the ice melting current as I, and returning to the step F);
H) recalculating the size of the ice melting current, and executing the step I);
I) reducing the size of the ice-melting current to be I');
J) judging whether the sum of the temperature mutation distances is less than or equal to 30% L and less than 50% L, if so, executing the step K); otherwise, executing the step L);
K) keeping the ice melting current to be I', and returning to the step J);
l) recalculating the size of the ice-melting current, and executing the step M);
m) reducing the ice-melting current to I');
n) judging whether the sum of the temperature mutation distances is more than 80% L, if so, executing the step P); otherwise, executing step O);
o) keeping the ice melting current to be I'), and returning to the step N);
p) power failure;
and Q) finishing the ice melting.
The optical fiber monitoring-based OPGW overhead ground wire ice melting control system and method have the following beneficial effects: the device is provided with an OPGW overhead ground wire, an optical fiber splice closure, an ice melting monitoring system, an ice coating monitoring system, an ice melting control device and an ice melting device, wherein the ice melting monitoring system is used for monitoring the temperature data of the OPGW overhead ground wire in the ice melting process and feeding back the temperature data to the ice coating monitoring system, the ice coating monitoring system is used for monitoring the ice coating state of the OPGW overhead ground wire, the ice coating monitoring system calculates the ice coating condition of the OPGW overhead ground wire and further judges and identifies the ice melting state, the invention can ensure effective ice melting of the power transmission line and no damage to the wires in the ice melting process, provides necessary guarantee for quick and effective ice melting of the power grid, and can ensure the safety of the OPGW line in the ice melting process and realize comprehensive ice melting.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a system in an embodiment of the system and method for controlling ice melting of an OPGW overhead ground wire based on optical fiber monitoring according to the present invention;
FIG. 2 is a schematic diagram of temperature change in an ice melting process at a certain point of an OPGW overhead ground wire in the embodiment;
fig. 3 is a flow chart of the method in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the optical fiber monitoring-based OPGW overhead ground wire ice melting control system and method, the structural schematic diagram of the optical fiber monitoring-based OPGW overhead ground wire ice melting control system is shown in FIG. 1. In fig. 1, the optical fiber monitoring based ice melting control system for the OPGW overhead ground wire comprises an OPGW overhead ground wire 1, an optical fiber splice closure 2, an ice melting monitoring system 3, an ice coating monitoring system 4, an ice melting control device 5 and an ice melting device 6, wherein the optical fiber splice closure 2 is connected with the OPGW overhead ground wire 1 through an optical fiber, the ice melting monitoring system 3 is connected with the optical fiber splice closure 2 through an optical fiber and is used for monitoring the temperature data of the OPGW overhead ground wire 1 during the ice melting process and feeding back the temperature data to the ice coating monitoring system 4, the ice coating monitoring system 4 is connected with the ice melting monitoring system 3 and is used for monitoring the ice coating state of the OPGW overhead ground wire 1, calculating the ice coating condition of the OPGW overhead ground wire 1 and further judging and identifying the ice melting state, the ice coating monitoring system 4 collects data through an ice coating monitoring device (not shown in the figure) installed on the OPGW overhead ground wire 1 according to different, the ice melting control device 5 is connected with the ice coating monitoring system 4 and used for controlling ice melting current, the ice melting device 6 is connected with the ice melting control device 5 and used for carrying out direct current ice melting on the OPGW overhead ground wire 1, and the ice melting device 6 is also connected with the OPGW overhead ground wire 1 through an ice melting wire.
The invention transmits the temperature data monitored by the ice melting monitoring system 3 to the ice coating monitoring system 4, and calculates the current ice coating state, thereby controlling the ice melting current. The direct-current deicing method comprises the steps that a deicing device 6 of the transformer substation carries out direct-current deicing on an OPGW overhead ground wire 1, an icing monitoring system 4 is responsible for monitoring the icing state of a line, an icing monitoring system 3 is responsible for monitoring the temperature data of the OPGW overhead ground wire 1 in the deicing process, the temperature data are fed back to the icing monitoring system 4 to calculate the icing condition of the OPGW overhead ground wire 1, then the deicing state is judged and identified, and the deicing current is controlled by a deicing control device 5 according to different deicing current control schemes corresponding to different deicing states.
According to the ice melting process, the ice melting state can be divided into four stages, namely an initial ice melting stage (temperature rise), an ice melting time stage, a partial ice removing stage, a full ice removing stage and the like. Judging the ice melting state according to the temperature change characteristics, which comprises the following steps:
an initial stage of ice melting: before ice melting starts, the temperature is low, and when ice melting current is introduced into an OPGW (optical fiber composite overhead ground wire), the temperature data monitored by an ice melting monitoring system linearly rises;
a time-phase of ice melting: when the temperature rises slowly and tends to a stable value, the OPGW circuit reaches a thermal balance, the temperature is influenced by the external environment temperature at the stage, the monitoring temperature slightly changes, but the change range is small and basically negligible;
partial de-icing stage: before and after the ice coating on the wire falls off, the temperature data has the characteristic of obvious rise;
and (3) a comprehensive deicing stage: when the ice melting of the line is basically finished, the collected temperature data on the whole line is uniform and tends to be stable, and the ice melting is finished at the moment.
Fig. 2 is a schematic diagram of temperature change during ice melting process of a certain point of the OPGW overhead ground wire in this embodiment.
The OPGW overhead ground wire ice melting control system based on optical fiber monitoring can effectively identify the ice melting state and control ice melting, can ensure that a power transmission line effectively melts ice, can ensure that a lead is not damaged in the ice melting process, provides necessary guarantee for quick and effective ice removal of a power grid, can ensure the safety of an OPGW line in the ice melting process, and can realize comprehensive ice melting.
The invention also relates to an OPGW overhead ground wire ice melting control method based on optical fiber monitoring, which is applied to the OPGW overhead ground wire ice melting control system based on optical fiber monitoring in the embodiment. A flowchart of the OPGW overhead ground wire ice-melting control method based on optical fiber monitoring is shown in fig. 3. In fig. 3, the OPGW overhead ground wire ice melting control method based on optical fiber monitoring includes the following steps:
step S01 starts the icing monitoring system: in this step, the icing monitoring system is started to enable the icing monitoring system to work normally.
Step S02 calculates the ice-melting current according to the degree of ice coating: in this step, the ice-melting current is calculated according to the degree of ice coating.
Step S03 ice-melting start: in this step, ice melting starts.
Step S04 sets the ice-melting current to I: in this step, the ice-melting current is set to I.
Step S05 starts the ice melting device and ice melting monitoring system: in this step, the ice melting device and the ice melting monitoring system are started.
Step S06, setting the monitoring length of the OPGW overhead ground wire as L, and judging whether the sum of the temperature mutation distances is less than 30% L: in the step, the monitoring length of the OPGW overhead ground wire is set to be L, whether the sum of the temperature mutation distances is less than 30% L or not is judged, and if the judgment result is yes, the step S07 is executed; otherwise, step S08 is executed.
Step S07 keeps the ice-melting current I: if the judgment result of the above step S06 is yes, the present step is executed. In this step, the ice-melting current is kept at I. After the present step is executed, the process returns to step S06.
Step S08 recalculates the magnitude of the ice-melting current: if the judgment result of the above step S06 is no, the present step is executed. In this step, the magnitude of the ice-melting current is recalculated.
Step S09 reduces the ice-melting current to I': in this step, the magnitude of the ice-melting current is reduced to I'.
Step S10, judging whether the sum of the temperature mutation distances is less than or equal to 30% L and less than 50% L: in this step, it is judged whether the sum of the temperature jump distance satisfying 30% L or less is less than 50% L, and if the judgment result is yes, step S11 is executed; otherwise, step S12 is executed.
Step S11 keeps the ice-melting current I': if the judgment result of the above step S10 is yes, the present step is executed. In this step, the ice-melting current is kept at I'. After the present step is executed, the process returns to step S10.
Step S12 recalculates the magnitude of the ice-melting current: if the judgment result of the above step S10 is no, the present step is executed. In this step, the magnitude of the ice-melting current is recalculated. After the present step is executed, step S13 is executed.
Step S13 reduces the ice-melting current to I ": in this step, the ice-melting current is reduced to I ".
Step S14 judges whether the sum of the temperature jump distances > 80% L is satisfied: in this step, it is judged whether or not the sum of the temperature jump distances is > 80% L, and if the judgment result is yes, step S16 is executed.
Step S15 keeps the ice-melting current I ": if the judgment result of the above step S14 is no, the present step is executed. In this step, the ice-melting current is kept at I ", and the step is executed and the process returns to step S14.
Step S16 power off: if the judgment result of the above step S14 is yes, the present step is executed. In this step, power is cut off.
And step S17, ice melting is finished: in this step, the ice melting is finished.
In order to guarantee the performance of the OPGW cable and the safety of a line in the ice melting process, the ice melting monitoring system 3 is utilized to collect temperature data in the ice melting process of the OPGW overhead ground wire in real time, the ice melting state is identified through the temperature data, the ice melting data are fed back to the ice coating monitoring system 4 according to the ice melting state, the size of ice melting current is recalculated, the safety of the OPGW overhead ground wire in the ice melting process is guaranteed, and the comprehensive ice melting can be realized.
The invention is based on the existing optical fiber temperature sensing monitoring, utilizes the optical cable carried by the OPGW to monitor the ice melting process of the OPGW overhead ground wire, and controls the ice melting process according to the monitored temperature and stress data, thereby solving the problem that the ice melting process lacks an effective control method.
In a word, the ice melting monitoring system 3 is utilized, real-time acquisition of temperature data of the OPGW overhead ground wire and ice melting state monitoring can be achieved, visual data reference is provided for operation and maintenance personnel, and emergency situations can be handled conveniently in time. The ice melting state is identified through the temperature data collected by the ice melting monitoring system, the ice melting current is adjusted in time, and the safety of the line is guaranteed while the ice melting of the OPGW overhead ground wire 1 is guaranteed. The ice-melting current is adjusted according to different ice-coating degrees, so that the ice melting of the line is more comprehensive, and the effect is better.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. An OPGW overhead ground wire ice-melting control system based on optical fiber monitoring is characterized by comprising an OPGW overhead ground wire, an optical fiber splice closure, an ice-melting monitoring system, an ice-coating monitoring system, an ice-melting control device and an ice-melting device, wherein the optical fiber splice closure is connected with the OPGW overhead ground wire through optical fibers, the ice-melting monitoring system is connected with the optical fiber splice closure through optical fibers and used for monitoring the temperature data of the OPGW overhead ground wire in the ice-melting process and feeding back the temperature data to the ice-coating monitoring system, the ice-coating monitoring system is connected with the ice-melting monitoring system and used for monitoring the ice-coating state of the OPGW overhead ground wire, calculating the ice-coating condition of the OPGW overhead ground wire and further judging and identifying the ice-melting state, different ice-melting current control schemes are corresponded to according to different ice-melting states, and the ice-coating monitoring system collects data through the ice-coating monitoring, the ice melting control device is connected with the ice coating monitoring system and used for controlling ice melting current, the ice melting device is connected with the ice melting control device and used for carrying out direct current ice melting on the OPGW overhead ground wire, and the ice melting device is also connected with the OPGW overhead ground wire through an ice melting wire.
2. The OPGW overhead ground wire ice-melting control system based on optical fiber monitoring as claimed in claim 1, wherein the ice-melting state comprises an initial stage of ice-melting, an ongoing stage of ice-melting, a partial stage of ice-melting, and a full stage of ice-melting.
3. The OPGW overhead ground wire ice melting control system based on optical fiber monitoring as claimed in claim 2, wherein in the initial stage of ice melting, when ice melting current is introduced into the OPGW overhead ground wire, the temperature data monitored by the ice melting monitoring system rises linearly.
4. The fiber monitoring based OPGW overhead ground wire ice-melt control system of claim 2, wherein during the ice-melt on-going phase, as temperature rise slowly approaches a steady value, the OPGW overhead ground wire reaches a thermal equilibrium.
5. The OPGW overhead ground wire ice-melt control system based on optical fiber monitoring of claim 2, wherein the temperature data is characterized by an increase before and after ice coating on the OPGW overhead ground wire falls off during the partial ice-shedding stage.
6. The OPGW overhead ground wire ice melting control system based on optical fiber monitoring as claimed in claim 2, wherein in the full de-icing stage, when the OPGW overhead ground wire is de-iced, the collected temperature data on the OPGW overhead ground wire is uniform and tends to be stable, and at the moment, the de-icing is completed.
7. An OPGW overhead ground wire ice melting control method based on optical fiber monitoring is applied to the OPGW overhead ground wire ice melting control system based on optical fiber monitoring as claimed in claim 1, and comprises the following steps:
A) starting an icing monitoring system;
B) calculating the ice-melting current according to the ice coating degree;
C) starting ice melting;
D) setting the ice melting current to be I;
E) starting the ice melting device and the ice melting monitoring system;
F) setting the monitoring length of the OPGW overhead ground wire as L, judging whether the sum of the temperature mutation distances is less than 30% L, and if so, executing the step G); otherwise, executing step H);
G) keeping the ice melting current as I, and returning to the step F);
H) recalculating the size of the ice melting current, and executing the step I);
I) reducing the size of the ice-melting current to be I');
J) judging whether the sum of the temperature mutation distances is less than or equal to 30% L and less than 50% L, if so, executing the step K); otherwise, executing the step L);
K) keeping the ice melting current to be I', and returning to the step J);
l) recalculating the size of the ice-melting current, and executing the step M);
m) reducing the ice-melting current to I');
n) judging whether the sum of the temperature mutation distances is more than 80% L, if so, executing the step P); otherwise, executing step O);
o) keeping the ice melting current to be I'), and returning to the step N);
p) power failure;
and Q) finishing the ice melting.
CN201911261932.0A 2019-12-10 2019-12-10 OPGW overhead ground wire ice melting control system and method based on optical fiber monitoring Pending CN111130043A (en)

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Application Number Priority Date Filing Date Title
CN201911261932.0A CN111130043A (en) 2019-12-10 2019-12-10 OPGW overhead ground wire ice melting control system and method based on optical fiber monitoring

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Application Number Priority Date Filing Date Title
CN201911261932.0A CN111130043A (en) 2019-12-10 2019-12-10 OPGW overhead ground wire ice melting control system and method based on optical fiber monitoring

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Publication Number Publication Date
CN111130043A true CN111130043A (en) 2020-05-08

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CN106159859A (en) * 2015-04-20 2016-11-23 中国电力科学研究院 A kind of OPGW ice melting system
CN106300199A (en) * 2015-05-29 2017-01-04 国家电网公司 A kind of ice melting system being automatically adjusted output electric current according to icing line temperature

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Publication number Priority date Publication date Assignee Title
US3218384A (en) * 1962-03-29 1965-11-16 Int Nickel Co Temperature-responsive transmission line conductor for de-icing
CN106159859A (en) * 2015-04-20 2016-11-23 中国电力科学研究院 A kind of OPGW ice melting system
CN105119227A (en) * 2015-04-28 2015-12-02 中国电力科学研究院 OPGW DC ice-melting system
CN106300199A (en) * 2015-05-29 2017-01-04 国家电网公司 A kind of ice melting system being automatically adjusted output electric current according to icing line temperature
CN105634130A (en) * 2016-01-28 2016-06-01 中国电力科学研究院 De-icing communication method suitable for overhead line

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