CN106300199B - A kind of ice melting system that output current is automatically adjusted according to icing line temperature - Google Patents

A kind of ice melting system that output current is automatically adjusted according to icing line temperature Download PDF

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Publication number
CN106300199B
CN106300199B CN201510283944.9A CN201510283944A CN106300199B CN 106300199 B CN106300199 B CN 106300199B CN 201510283944 A CN201510283944 A CN 201510283944A CN 106300199 B CN106300199 B CN 106300199B
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mrow
msub
temperature
icing
ice
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CN106300199A (en
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贲宝强
渠学景
王彦朋
陈贺
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State Grid Corp of China SGCC
NARI Group Corp
State Grid Sichuan Electric Power Co Ltd
China EPRI Science and Technology Co Ltd
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State Grid Corp of China SGCC
State Grid Sichuan Electric Power Co Ltd
Nanjing NARI Group Corp
China EPRI Science and Technology Co Ltd
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Abstract

The present invention relates to a kind of ice melting system that output current is automatically adjusted according to icing line temperature, system includes:Icing circuit is drawn by the DC side of ice-melt power module, is connected to the temperature on-site supervision sensing module for obtaining icing line conductor temperature data and the icing on-site supervision sensing module for obtaining icing line conductor outside diameter data respectively;Temperature on-site supervision sensing module is bi-directionally connected optical fiber temperature grating adjustment module;Icing on-site supervision sensing module is bi-directionally connected icing fiber grating adjustment module;Optical fiber temperature grating adjustment module and icing fiber grating adjustment module connect monitoring computing module, monitoring computing module connection ice-melt power module respectively;The present invention provides a kind of ice melting system that output current is automatically adjusted according to icing line temperature, can be according to collection icing line temperature and icing situation, the output current of ice-melt power supply is automatically adjusted, there is automatic adjustment, rapid, the remote transmission that communicates, adapt to adverse circumstances.

Description

A kind of ice melting system that output current is automatically adjusted according to icing line temperature
Technical field
The present invention relates to a kind of transmission system SVC voltage regulators, and in particular to a kind of automatic according to icing line temperature Adjust the ice melting system of output current.
Background technology
Icing is one of natural calamity of electric system to transmission line of electricity in the winter time.Icing can break when serious, fall bar/fall Tower, causes large area blackout, and repair difficulty is big, cycle length, and coverage is wide.Therefore, it is reply ice and snow calamity Evil strengthens the research to transmission line de-icing technology both at home and abroad to the serious threat of electric system infrastructure.
Relatively broad deicing at present, deicing device are DC de-icing devices, the basic principle that DC de-icing device uses It is that AC power is transformed into DC power supply, then DC power supply is loaded on icing circuit, passes through the resistance of icing circuit The ice-melt of circuit is realized in fever;Its principle is using icing circuit as load, applies DC power supply, short circuit is provided with low voltage Electric current heating wires melt icing.Generator power supply rectification and two kinds of sides of silicon controlled rectifier using system power supply can be used Method.Though the former can reduce investment but generate electricity and be limited by unit capacity and capacity needed for ice-melt, most cases are all unsatisfactory for needing Ask.Therefore, it is the hot spot in thermal ice-melting method using the silicon controlled rectifier ice-melt of system power supply, its applicability is stronger, can basis Different situations adjust DC ice melting voltage, are allowed to meet the needs of different application environment, are optimal in existing de-icing method It is a kind of.
Conventional DC de-icing device is independent operating with temperature and ice covering monitoring system, is not in contact with each other, If icing circuit needs ice-melt, it is necessary to by manually observing whether icing circuit jeopardizes shaft tower safety, judges that icing is serious, opens Dynamic DC de-icing device, determines the ice melting current of circuit, carries out ice-melt.If in deicing processes, find icing line ice-melting effect Fruit is poor, need to be manually operated DC de-icing device, improves the ice melting current of circuit;In deicing processes, the temperature of icing circuit is found It is excessive to spend monitoring system displays temperature, has the danger for burning circuit, DC de-icing device need to be manually operated, reduce the ice-melt of circuit Electric current, the deicing processes of the above need manual operation, cumbersome using process.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of melting according to icing line temperature automatic adjustment output current Ice system, according to collection icing line temperature and icing situation, can automatically adjust the output current of ice-melt power supply, have automatic Adjust, communication is rapid, transmit at a distance, adapts to the advantages that adverse circumstances.
The purpose of the present invention is what is realized using following technical proposals:
A kind of ice melting system that output current is automatically adjusted according to icing line temperature, it is improved in that including:
Temperature on-site supervision sensing module, optical fiber temperature grating adjustment module, icing on-site supervision sensing module, icing light Fine grating adjustment module, monitoring computing module, ice-melt power module and icing circuit;
The icing circuit is drawn by the DC side of the ice-melt power module, is connected to acquisition icing circuit respectively and is led The temperature on-site supervision sensing module of line temperature data and the icing for obtaining icing line conductor outside diameter data On-site supervision sensing module;
The temperature on-site supervision sensing module is bi-directionally connected the optical fiber temperature grating adjustment module;
The icing on-site supervision sensing module is bi-directionally connected the icing fiber grating adjustment module;
The optical fiber temperature grating adjustment module and the icing fiber grating adjustment module connect the monitoring meter respectively Module is calculated, the monitoring computing module connects the ice-melt power module;
Preferably, the temperature data includes:Conductor temperature Ti, environment temperature TeWith conducting wire and the temperature T of ice interface0; The outside diameter data include:Outer diameter D and wire diameter d after wire icing.
Preferably, the temperature on-site supervision sensing module is bi-directionally connected the optical fiber temperature grating adjustment module and includes:
The optical fiber temperature grating adjustment module is used for by way of erbium-doped fiber amplifier carries out light amplification to signal, Optical signal and the reception for being used for gathering the icing line conductor temperature data are sent to the temperature on-site supervision sensing module Carry the return signal of the icing line conductor temperature data.
Preferably, the icing on-site supervision sensing module is bi-directionally connected the icing fiber grating adjustment module and includes:
The icing fiber grating adjustment module is used for by way of erbium-doped fiber amplifier carries out light amplification to signal, Optical signal and the reception for being used for gathering the icing line conductor outside diameter data are sent to the icing on-site supervision sensing module Carry the return signal of the icing line conductor outside diameter data.
Preferably, the optical fiber temperature grating adjustment module and the icing fiber grating adjustment module connect described respectively Computing module is monitored, the monitoring computing module, which connects the ice-melt power module, to be included:
The monitoring computing module is used for the thermal balance public affairs according to the temperature data, the outside diameter data and conducting wire ice-melt Formula (1-1) calculates the relation of ice-melt time t and ice melting current I and critical ice melting current IC, and control the ice-melt power module The ice melting current I is exported, output time is ice-melt time t;The heat balance equation (1-1) of the conducting wire ice-melt is:
I2R0T=Q1+Q2+Q3+Q4+Q5 (1-1)
I:Ice melting current;
R0Conductor resistance when conductor temperature is 0 DEG C;
Q1:The temperature of the ice of part is melted from conducting wire environment temperature TeIt is warming up to the temperature T of conducting wire and ice interface0Institute The heat of absorption;
Q2:Melt the heat absorbed needed for ice;
Q3:The heat that the ice temperature change not being melted absorbs;
Q4:Conductor temperature is from conducting wire environment temperature TeIt is warming up to the temperature T of conducting wire and ice interface0The heat absorbed;
Q5:Ice surface dispersed heat.
Further, it is described according to the temperature data, the heat balance equation (1-1) of the outside diameter data and conducting wire ice-melt Calculate critical ice melting current ICIncluding:
In formula (1-2), TeFor conducting wire environment temperature, T0For the temperature of conducting wire and ice interface, TiFor conductor temperature, D is to lead Outside diameter after line icing, d are wire diameter, R0Conductor resistance when conductor temperature is 0 DEG C, ReFor Reynolds number, kiFor heat conduction system Number, n and C are that environmental coefficient confirms according to formula (1-3);
Wherein, ReFor Reynolds number, calculation formula is:
In formula (1-3), DiFor ice layer thickness, vaFor wind speed, n and C are that environmental coefficient confirms according to formula (1-3);
Further, the relation of calculating ice-melt time t and ice melting current I is:
In formula, D is the outside diameter after wire icing, and d is wire diameter, and I is ice melting current, ICFor critical ice melting current, R0Lead Conductor resistance when line temperature is 0 DEG C, TiFor conductor temperature, TeFor conducting wire environment temperature, AAlAccumulated for conducting wire aluminium cross section, AFe Accumulated for conducting wire steel cross section.
Preferably, the monitoring computing module is additionally operable to when conductor temperature exceedes limiting temperature, controls the ice-melt electricity Source module stops output ice melting current.
Preferably, the icing circuit includes:Transmission line of electricity and optical fiber composite overhead ground wire.
Preferably, the ice-melt power module includes:Breaker, fuse, contactor, current transformer, boosting transformation Device, silicon controlled rectifier, Hall current sensor and Hall voltage sensor;;
The output terminal of generator or substation's power supply is sequentially connected the breaker, fuse, contactor, Current Mutual Inductance Device, step-up transformer;The silicon controlled rectifier includes:The first branch, the second branch and the 3rd branch in parallel successively, its In, the first branch, the second branch and the 3rd branch include the thyristor of two series connection;The three-phase of the step-up transformer The output terminal tie point phase between two thyristors connected in the first branch, the second branch and the 3rd branch respectively Even;
The Hall voltage sensor first branch with the silicon controlled rectifier, the second branch and the 3rd branch respectively It is in parallel;One end of the Hall current sensor connects one end of the Hall voltage sensor, the Hall current sensor The other end be connected with the output terminal of the silicon controlled rectifier.
Beneficial effects of the present invention:
A kind of 1. ice melting system that output current is automatically adjusted according to icing line temperature of the present invention, wherein showing comprising temperature Field monitoring sensing module, optical fiber temperature grating adjustment module, icing on-site supervision sensing module, icing fiber grating adjust mould Block, monitoring computing module, ice-melt power module and icing circuit, monitoring computing module obtain the icing situation of icing circuit, and When determine ice-melt time and the ice melting current of ice-melt power module with the communication of ice-melt power module, control ice-melt power module it is defeated Go out, temperature on-site supervision sensing module constantly monitors the temperature of icing circuit, and discovery exceedes line temperature limit value, with DC ice melting Device communication stops ice-melt in time.
2. a kind of ice melting system that output current is automatically adjusted according to icing line temperature of the present invention can be covered according to collection Ice line temperature and icing situation, automatically adjust the output current of ice-melt power supply, rapid, remote with automatic adjustment, communication Transmission, adapt to the advantages that adverse circumstances.
Brief description of the drawings
Fig. 1 is that a kind of system structure for the ice melting system that output current is automatically adjusted according to icing line temperature of the present invention is shown It is intended to;
Fig. 2 is a kind of ice melting system that output current is automatically adjusted according to icing line temperature of the present invention based on unidirectional The structure diagram of the overlength sensing solutions of EDFA amplifications;
Fig. 3 is a kind of ice melting system that output current is automatically adjusted according to icing line temperature of the present invention based on two-way The structure diagram of the overlength sensing solutions of EDFA amplifications;
Fig. 4 is a kind of ice-melt power supply mould for the ice melting system that output current is automatically adjusted according to icing line temperature of the present invention Block circuit connection diagram.
Embodiment
Elaborate below in conjunction with the accompanying drawings to the embodiment of the present invention.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art The all other embodiment obtained without making creative work, belongs to the scope of protection of the invention.
A kind of ice melting system that output current is automatically adjusted according to icing line temperature, as shown in Figure 1, the system bag Include:
Temperature on-site supervision sensing module, optical fiber temperature grating adjustment module, icing on-site supervision sensing module, icing light Fine grating adjustment module, monitoring computing module, ice-melt power module and icing circuit;
The icing circuit is drawn by the DC side of the ice-melt power module, is connected to acquisition icing circuit respectively and is led The temperature on-site supervision sensing module of line temperature data and the icing for obtaining icing line conductor outside diameter data On-site supervision sensing module;
Wherein, the temperature data includes:Conductor temperature Ti, environment temperature ToWith conducting wire and the temperature T of ice interface0;Institute Stating outside diameter data includes:Outer diameter D and wire diameter d after wire icing.
The temperature on-site supervision sensing module is bi-directionally connected the optical fiber temperature grating adjustment module;
The optical fiber temperature grating adjustment module is used for by way of erbium-doped fiber amplifier carries out light amplification to signal, Optical signal and the reception for being used for gathering the icing line conductor temperature data are sent to the temperature on-site supervision sensing module Carry the return signal of the icing line conductor temperature data.
The icing on-site supervision sensing module is bi-directionally connected the icing fiber grating adjustment module;
The icing fiber grating adjustment module is used for by way of erbium-doped fiber amplifier carries out light amplification to signal, Optical signal and the reception for being used for gathering the icing line conductor outside diameter data are sent to the icing on-site supervision sensing module Carry the return signal of the icing line conductor outside diameter data.
Since the current practical supported single-ended distance sensing of maximum of fiber grating sensing system is about 30km-40km, It is not enough to cover most of transmission line length.The application carries out light amplification by using erbium-doped optical fiber amplifier EDFA Mode, amplifying fiber grating demodulation instrument input/output optical signal power, improves fiber grating sensing system coverage, realizes Single-ended sensing measurement distance can reach the target of 120km not less than 60km, both-end sensing measurement distance, so as to substantially meet current The sensing measurement required distance of most transmission lines of electricity.
For example, as shown in Fig. 2, based on unidirectional EDFA amplification overlength sensing solutions, by defeated to fiber Bragg grating (FBG) demodulator The amplification of optical signals, and then the optical power budget of fiber Bragg grating (FBG) demodulator is increased, so as to increase its light that can be supported Sense coverage;
As shown in figure 3, the overlength sensing solutions based on two-way EDFA amplifications, by believing fiber Bragg grating (FBG) demodulator output light Number and fiber-optic grating sensor reflected light signal carry out Bi-directional amplifier, and then increase fiber Bragg grating (FBG) demodulator to a greater extent Optical power budget, realize the sensing coverage of fiber Bragg grating (FBG) demodulator bigger.
The characteristics of in view of the application and the optical fiber temperature grating adjustment module and the icing fiber grating adjust mould Block respectively with the optical fiber temperature grating adjustment module and the line length of the icing fiber grating adjustment module data transfer, Monitoring computing module uses 1 DTS 200-240 (22 kilometer of 4 passage), and temperature is run to transmission line of electricity using single-ended connection mode Degree is monitored in real time.The ice melting current that monitoring calculating center passes through according to the formula of ice melting current calculating OPGW first, produces Heat makes the reference ice melting current that icing melts;Further according to landform, weather, icing situation (property, shape, ice thickness), OPGW knots Structure and de-icing method etc. are different, and the ice melting current by OPGW is allowed by OPGW optics, mechanical property test analysis.
At the same time according to the temperature information that measures, conductor temperature along grasp, the stress and temperature of the line ice coating of long-term accumulation Degree data can be to transmission line of electricity operation and design provide foundation.
The optical fiber temperature grating adjustment module and the icing fiber grating adjustment module connect the monitoring meter respectively Module is calculated, the monitoring computing module connects the ice-melt power module;
The monitoring computing module is used for the thermal balance public affairs according to the temperature data, the outside diameter data and conducting wire ice-melt Formula (1-1) calculates the relation of ice-melt time t and ice melting current I and critical ice melting current IC, and control the ice-melt power module The ice melting current I is exported, output time is ice-melt time t;
Wherein, the ice-melt principle formula (1-1) is:
I2R0T=Q1+Q2+Q3+Q4+Q5 (1-1)
I:Ice melting current;
R0Conductor resistance when conductor temperature is 0 DEG C;
Q1:The temperature of the ice of part is melted from conducting wire environment temperature TeIt is warming up to the temperature T of conducting wire and ice interface0Institute The heat of absorption;
Q2:Melt the heat absorbed needed for ice;
Q3:The heat that the ice temperature change not being melted absorbs;
Q4:Conductor temperature is from conducting wire environment temperature TeIt is warming up to the temperature T of conducting wire and ice interface0The heat absorbed;
Q5:Ice surface dispersed heat.
The heat balance equation (1-1) according to the temperature data, the outside diameter data and conducting wire ice-melt can export Critical ice melting current ICFor:
In formula (1-2), TeFor conducting wire environment temperature, T0For the temperature of conducting wire and ice interface, TiFor conductor temperature, D is to lead Outside diameter after line icing, d are wire diameter, R0Conductor resistance when conductor temperature is 0 DEG C, ReFor Reynolds number, kiFor heat conduction system Number, n and C are that environmental coefficient confirms according to formula (1-3);
Wherein, ReFor Reynolds number, calculation formula is:
In formula (1-3), DiFor ice layer thickness, vaFor wind speed, n and C are that environmental coefficient confirms according to formula (1-3);
According to formula (1-4) calculate the ice-melt time t and ice melting current I relation be:
In formula, D is the outside diameter after wire icing, and d is wire diameter, and I is ice melting current, ICFor critical ice melting current, R0Lead Conductor resistance when line temperature is 0 DEG C, TiFor conductor temperature, TeFor conducting wire environment temperature, AAlAccumulated for conducting wire aluminium cross section, AFe Accumulated for conducting wire steel cross section.
The monitoring computing module is additionally operable to, when conductor temperature exceedes limiting temperature, control the ice-melt power module to stop Ice melting current is only exported, the limiting temperature can be manually set according to the actual conditions of conducting wire.
The icing circuit includes:Transmission line of electricity and optical fiber composite overhead ground wire.
The ice-melt power module, as described in Figure 4, including:Breaker, fuse, contactor, current transformer, boosting Transformer, silicon controlled rectifier, Hall current sensor and Hall voltage sensor;
The output terminal of generator or substation's power supply is sequentially connected the breaker, fuse, contactor, Current Mutual Inductance Device, step-up transformer;The silicon controlled rectifier includes:The first branch, the second branch and the 3rd branch in parallel successively, its In, the first branch, the second branch and the 3rd branch include the thyristor of two series connection;The three-phase of the step-up transformer Output terminal connects in the first branch, the second branch and the 3rd branch between the thyristor of two series connection respectively;
The Hall voltage sensor first branch with the silicon controlled rectifier, the second branch and the 3rd branch respectively It is in parallel;One end of the Hall current sensor connects one end of the Hall voltage sensor, the Hall current sensor The other end be connected with the output terminal of the silicon controlled rectifier.
Wherein, the step-up transformer.Mainly play isolation, boosting etc., wiring is Y/D11 modes;Thyristor rectifier The main convertor equipment of device ice melting system, provides DC ice melting current, by varying gate tube valve in deicing processes for icing circuit Trigger Angle carry out adjusting circuit DC current;The breaker and contactor are, it can be achieved that to functions such as normal drop-out currents.
Finally it should be noted that:The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent Pipe is described in detail the present invention with reference to above-described embodiment, those of ordinary skills in the art should understand that:Still Can be to the embodiment technical scheme is modified or replaced equivalently of the present invention, and without departing from any of spirit and scope of the invention Modification or equivalent substitution, it should all cover within the claims of the present invention.

Claims (9)

  1. A kind of 1. ice melting system that output current is automatically adjusted according to icing line temperature, it is characterised in that the system comprises:
    Temperature on-site supervision sensing module, optical fiber temperature grating adjustment module, icing on-site supervision sensing module, icing optical fiber light Grid adjustment module, monitoring computing module, ice-melt power module and icing circuit;
    The icing circuit is drawn by the DC side of the ice-melt power module, is connected to obtain icing line conductor temperature respectively The temperature on-site supervision sensing module of degrees of data and the icing scene for obtaining icing line conductor outside diameter data Monitor sensing module;
    The temperature on-site supervision sensing module is bi-directionally connected the optical fiber temperature grating adjustment module;
    The icing on-site supervision sensing module is bi-directionally connected the icing fiber grating adjustment module;
    The optical fiber temperature grating adjustment module and the icing fiber grating adjustment module connect the monitoring and calculate mould respectively Block, the monitoring computing module connect the ice-melt power module;
    The temperature on-site supervision sensing module, which is bi-directionally connected the optical fiber temperature grating adjustment module, to be included:
    The optical fiber temperature grating adjustment module is used for by erbium-doped fiber amplifier to for gathering the icing line conductor The optical signal of temperature data and the return signal for carrying the icing line conductor temperature data carry out light amplification, to described Temperature on-site supervision sensing module, which sends the optical signal for being used for gathering the icing line conductor temperature data and receives, carries institute State the return signal of icing line conductor temperature data.
  2. 2. the system as claimed in claim 1, it is characterised in that the temperature data includes:Conductor temperature Ti, environment temperature Te With conducting wire and the temperature T of ice interface0;The outside diameter data include:Outer diameter D and wire diameter d after wire icing.
  3. 3. the system as claimed in claim 1, it is characterised in that the icing on-site supervision sensing module is bi-directionally connected described cover Ice fiber grating adjustment module includes:
    The icing fiber grating adjustment module is used for by erbium-doped fiber amplifier to for gathering the icing line conductor The optical signal of outside diameter data and the return signal for carrying the icing line conductor outside diameter data carry out light amplification, to described Icing on-site supervision sensing module, which sends the optical signal for being used for gathering the icing line conductor outside diameter data and receives, carries institute State the return signal of icing line conductor outside diameter data.
  4. 4. the system as claimed in claim 1, it is characterised in that the optical fiber temperature grating adjustment module and the icing optical fiber Grating adjustment module connects the monitoring computing module respectively, and the monitoring computing module connects the ice-melt power module bag Include:
    The monitoring computing module is used for the heat balance equation according to the temperature data, the outside diameter data and conducting wire ice-melt (1-1) calculates the relation of ice-melt time t and ice melting current I and critical ice melting current IC, and control the ice-melt power module defeated Go out the ice melting current I, output time is ice-melt time t;The heat balance equation (1-1) of the conducting wire ice-melt is:
    I2R0T=Q1+Q2+Q3+Q4+Q5 (1-1)
    I:Ice melting current;
    R0Conductor resistance when conductor temperature is 0 DEG C;
    Q1:The temperature of the ice of part is melted from conducting wire environment temperature TeIt is warming up to the temperature T of conducting wire and ice interface0Absorbed Heat;
    Q2:Melt the heat absorbed needed for ice;
    Q3:The heat that the ice temperature change not being melted absorbs;
    Q4:Conductor temperature is from conducting wire environment temperature TeIt is warming up to the temperature T of conducting wire and ice interface0The heat absorbed;
    Q5:Ice surface dispersed heat.
  5. 5. system as claimed in claim 4, it is characterised in that according to the temperature data, the outside diameter data and conducting wire melt The heat balance equation (1-1) of ice calculates critical ice melting current ICIncluding:
    <mrow> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mi>C</mi> </msub> <mo>=</mo> <msup> <mrow> <mo>&amp;lsqb;</mo> <mfrac> <mrow> <mn>2</mn> <msub> <mi>&amp;pi;k</mi> <mi>i</mi> </msub> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mn>0</mn> </msub> <mo>-</mo> <msub> <mi>T</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> </mrow> <mrow> <msub> <mi>R</mi> <mn>0</mn> </msub> <mi>ln</mi> <mrow> <mo>(</mo> <mfrac> <mrow> <mi>D</mi> <mo>+</mo> <mn>2</mn> <mi>d</mi> </mrow> <mi>D</mi> </mfrac> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>&amp;rsqb;</mo> </mrow> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </msup> <mo>=</mo> <msup> <mrow> <mo>(</mo> <mfrac> <mrow> <mn>2</mn> <msub> <mi>&amp;pi;k</mi> <mi>i</mi> </msub> </mrow> <mrow> <msub> <mi>R</mi> <mn>0</mn> </msub> <mi>ln</mi> <mfrac> <msub> <mi>D</mi> <mi>i</mi> </msub> <mi>D</mi> </mfrac> </mrow> </mfrac> <mo>&amp;times;</mo> <msub> <mi>T</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </msup> <mo>-</mo> <mfrac> <mrow> <mn>0.851075612</mn> <msub> <mi>T</mi> <mi>i</mi> </msub> </mrow> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>i</mi> </msub> <mo>-</mo> <msub> <mi>T</mi> <mi>e</mi> </msub> <mo>)</mo> <mi>ln</mi> <mo>(</mo> <mfrac> <mrow> <mi>D</mi> <mo>+</mo> <mn>2</mn> <mi>d</mi> </mrow> <mi>D</mi> </mfrac> <mo>)</mo> </mrow> </mfrac> <mo>=</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mn>4.05503055</mn> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>8</mn> </mrow> </msup> <mrow> <mo>(</mo> <mi>D</mi> <mo>+</mo> <mn>2</mn> <mi>d</mi> <mo>)</mo> </mrow> <msup> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>e</mi> </msub> <mo>+</mo> <mn>273</mn> <mo>)</mo> </mrow> <mn>3</mn> </msup> <mo>+</mo> <mo>{</mo> <mn>4.16942731463</mn> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>3</mn> </mrow> </msup> <mi>C</mi> <mo>&amp;CenterDot;</mo> <msubsup> <mi>R</mi> <mi>e</mi> <mi>n</mi> </msubsup> <mo>+</mo> <msup> <mrow> <mo>&amp;lsqb;</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>i</mi> </msub> <mo>-</mo> <msub> <mi>T</mi> <mi>e</mi> </msub> <mo>)</mo> <msup> <mrow> <mo>(</mo> <mi>D</mi> <mo>+</mo> <mn>2</mn> <mi>d</mi> <mo>)</mo> </mrow> <mn>3</mn> </msup> </mrow> <mrow> <mfrac> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>i</mi> </msub> <mo>+</mo> <msub> <mi>T</mi> <mi>e</mi> </msub> <mo>)</mo> </mrow> <mn>2</mn> </mfrac> <mo>+</mo> <mn>273</mn> </mrow> </mfrac> <mo>&amp;rsqb;</mo> </mrow> <mn>0.25</mn> </msup> <mo>}</mo> </mrow> </mtd> </mtr> </mtable> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
    In formula (1-2), TeFor conducting wire environment temperature, T0For the temperature of conducting wire and ice interface, TiFor conductor temperature, D covers for conducting wire Outside diameter after ice, d are wire diameter, R0Conductor resistance when conductor temperature is 0 DEG C, ReFor Reynolds number, kiFor thermal conductivity factor, n and C is that environmental coefficient confirms according to formula (1-3);
    Wherein, ReFor Reynolds number, calculation formula is:
    <mrow> <msub> <mi>R</mi> <mi>e</mi> </msub> <mo>=</mo> <mn>7.517442</mn> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mn>4</mn> </msup> <msub> <mi>D</mi> <mi>i</mi> </msub> <msub> <mi>v</mi> <mi>a</mi> </msub> <mo>,</mo> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <mn>40</mn> <mo>&amp;le;</mo> <msub> <mi>R</mi> <mi>e</mi> </msub> <mo>&lt;</mo> <mn>4000</mn> <mo>,</mo> <mi>C</mi> <mo>=</mo> <mn>0.683</mn> <mo>,</mo> <mi>n</mi> <mo>=</mo> <mn>0.466</mn> </mtd> </mtr> <mtr> <mtd> <mn>4000</mn> <mo>&amp;le;</mo> <msub> <mi>R</mi> <mi>e</mi> </msub> <mo>&lt;</mo> <mn>40000</mn> <mo>,</mo> <mi>C</mi> <mo>=</mo> <mn>0.193</mn> <mo>,</mo> <mi>n</mi> <mo>=</mo> <mn>0.618</mn> </mtd> </mtr> <mtr> <mtd> <mn>40000</mn> <mo>&amp;le;</mo> <msub> <mi>R</mi> <mi>e</mi> </msub> <mo>&lt;</mo> <mn>400000</mn> <mo>,</mo> <mi>C</mi> <mo>=</mo> <mn>0.0266</mn> <mo>,</mo> <mi>n</mi> <mo>=</mo> <mn>0.805</mn> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
    In formula (1-3), DiFor ice layer thickness, vaFor wind speed, n and C are that environmental coefficient confirms according to formula (1-3).
  6. 6. system as claimed in claim 5, it is characterised in that calculate the ice-melt time t and ice melting current I relation be:
    <mrow> <mtable> <mtr> <mtd> <mrow> <mi>t</mi> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>6</mn> </mrow> </msup> <mo>=</mo> <mfrac> <mrow> <mn>3.01047574135</mn> <mi>d</mi> <mrow> <mo>(</mo> <mi>D</mi> <mo>+</mo> <mi>d</mi> <mo>)</mo> </mrow> <mo>-</mo> <mn>1.0540915</mn> <mi>D</mi> <mrow> <mo>(</mo> <mn>0.1073</mn> <mi>D</mi> <mo>+</mo> <mi>d</mi> <mo>)</mo> </mrow> </mrow> <mrow> <mn>2</mn> <mrow> <mo>(</mo> <msup> <mi>I</mi> <mn>2</mn> </msup> <mo>-</mo> <msup> <mi>Ic</mi> <mn>2</mn> </msup> <mo>)</mo> </mrow> <msub> <mi>R</mi> <mn>0</mn> </msub> </mrow> </mfrac> <mo>&amp;times;</mo> <msub> <mi>T</mi> <mi>i</mi> </msub> <mo>+</mo> <mn>337.9145</mn> <mo>&amp;times;</mo> <mfrac> <mrow> <mi>D</mi> <mrow> <mo>(</mo> <mn>0.1073</mn> <mi>D</mi> <mo>+</mo> <mi>d</mi> <mo>)</mo> </mrow> </mrow> <mrow> <mo>(</mo> <msup> <mi>I</mi> <mn>2</mn> </msup> <mo>-</mo> <msup> <mi>Ic</mi> <mn>2</mn> </msup> <mo>)</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> </mrow> </mfrac> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>-</mo> <mfrac> <mrow> <mn>6.0209514827</mn> <mi>d</mi> <mrow> <mo>(</mo> <mi>D</mi> <mo>+</mo> <mi>d</mi> <mo>)</mo> </mrow> <mo>+</mo> <mn>2.444420</mn> <msub> <mi>A</mi> <mrow> <mi>A</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <mn>3.6989</mn> <msub> <mi>A</mi> <mrow> <mi>F</mi> <mi>e</mi> </mrow> </msub> </mrow> <mrow> <mo>(</mo> <msup> <mi>I</mi> <mn>2</mn> </msup> <mo>-</mo> <msup> <mi>Ic</mi> <mn>2</mn> </msup> <mo>)</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> </mrow> </mfrac> <mo>&amp;times;</mo> <msub> <mi>T</mi> <mi>e</mi> </msub> <mrow> <mo>(</mo> <mi>I</mi> <mo>&gt;</mo> <msub> <mi>I</mi> <mi>c</mi> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
    In formula, D is the outside diameter after wire icing, and d is wire diameter, and I is ice melting current, ICFor critical ice melting current, R0Conducting wire temperature Spend for 0 DEG C when conductor resistance, TiFor conductor temperature, TeFor conducting wire environment temperature, AAlAccumulated for conducting wire aluminium cross section, AFeTo lead Line steel cross section accumulates.
  7. 7. the system as claimed in claim 1, it is characterised in that the monitoring computing module is additionally operable to when conductor temperature exceedes limit When constant temperature is spent, the ice-melt power module is controlled to stop output ice melting current.
  8. 8. the system as claimed in claim 1, it is characterised in that the icing circuit includes:Transmission line of electricity and optical fiber composite frame Vacant lot line.
  9. 9. the system as claimed in claim 1, it is characterised in that the ice-melt power module includes:Breaker, fuse, connect Tentaculum, current transformer, step-up transformer, silicon controlled rectifier, Hall current sensor and Hall voltage sensor;
    The output terminal of generator or substation's power supply is sequentially connected the breaker, fuse, contactor, current transformer, liter Pressure transformer;The silicon controlled rectifier includes:The first branch, the second branch and the 3rd branch in parallel successively, wherein, it is described The first branch, the second branch and the 3rd branch include the thyristor of two series connection;The three-phase output end of the step-up transformer The tie point between the thyristor of two series connection in the first branch, the second branch and the 3rd branch is connected respectively;
    The first branch with the silicon controlled rectifier, the second branch and the 3rd branch be simultaneously respectively for the Hall voltage sensor Connection;One end of the Hall current sensor connects one end of the Hall voltage sensor, the Hall current sensor The other end is connected with the output terminal of the silicon controlled rectifier.
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CN107179332B (en) * 2017-05-17 2019-10-25 贵州电网有限责任公司电力科学研究院 A kind of transmission line de-icing time calculation method considering moisture film
CN107134740B (en) * 2017-06-29 2018-07-17 国网四川省电力公司电力科学研究院 The anti-icing method and system of extra high voltage direct current transmission line on-load
CN109838757A (en) * 2017-09-08 2019-06-04 南京钧乔行汽车灯具有限公司 A kind of headlight for vehicles cover surface removes accumulated snow method
CN108844660A (en) * 2018-07-11 2018-11-20 云南电网有限责任公司电力科学研究院 A kind of the conducting wire DC ice melting device for testing temperature rise and method shared based on shaft tower
CN109119931B (en) * 2018-08-06 2020-01-24 四川大学 Power transmission line online anti-icing and de-icing heat quantity calculation method based on self-made thermal conductor
CN111130043A (en) * 2019-12-10 2020-05-08 中国南方电网有限责任公司超高压输电公司 OPGW overhead ground wire ice melting control system and method based on optical fiber monitoring
CN111769644B (en) * 2020-07-08 2021-10-15 广州百畅信息科技有限公司 Monitoring system based on power grid safety
CN112087832B (en) * 2020-09-11 2022-02-11 安徽铱玛热能设备制造股份有限公司 Pipeline type electromagnetic induction heating system based on single chip microcomputer control

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