CN106300199A - A kind of ice melting system being automatically adjusted output electric current according to icing line temperature - Google Patents

Abstract

The present invention relates to a kind of ice melting system being automatically adjusted output electric current according to icing line temperature, system includes: icing circuit is drawn by the DC side of ice-melt power module, is connected to respectively obtain the temperature on-site supervision sensing module of icing line conductor temperature data and for obtaining the icing on-site supervision sensing module of icing line conductor external diameter data；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 respectively, and monitoring computing module connects ice-melt power module；The present invention provides a kind of ice melting system being automatically adjusted output electric current according to icing line temperature, can be according to gathering icing line temperature and icing situation, be automatically adjusted the output electric current of ice-melt power supply, have be automatically adjusted, communicate rapidly, the advantage such as long-distance transmissions, adaptation adverse circumstances.

Description

A kind of ice melting system being automatically adjusted output electric current according to icing line temperature

Technical field

The present invention relates to a kind of transmission system SVC voltage regulator, be specifically related to one and be automatically adjusted defeated according to icing line temperature Go out the ice melting system of electric current.

Background technology

Transmission line of electricity icing in the winter time is one of natural disaster of power system.Can break when icing is serious, fall bar/fall tower, cause Large area blackout, and repair difficulty is big, the cycle is long, and coverage is wide.Therefore, for reply ice disaster to electricity The serious threat of Force system infrastructure, strengthens the research to transmission line de-icing technology both at home and abroad.

The most relatively broad deicing, deicing device are DC de-icing devices, and the ultimate principle that DC de-icing device uses is to hand over Stream power conversion becomes DC source, then is loaded into by DC source on icing circuit, is realized by the heating of the resistance of icing circuit The ice-melt of circuit；Its principle is as load using icing circuit, applies DC source, provides short circuit current heating by low voltage Wire makes icing melt.Generator power supply rectification can be used and use two kinds of methods of silicon controlled rectifier of system power supply.Though the former can Reducing investment but generate electricity and limited with ice-melt desired volume by unit capacity, most cases is all unsatisfactory for demand.Therefore, use The silicon controlled rectifier ice-melt of system power supply is the focus in thermal ice-melting method, and its suitability is higher, can be straight according to different situations regulation Stream ice-melt voltage, is allowed to meet the demand of different application environment, is optimal one in existing de-icing method.

Conventional DC de-icing device is independent operating with temperature and ice covering monitoring system, is not in contact with each other, if covered Ice circuit needs ice-melt, it is necessary to whether jeopardize shaft tower safety by manual observation icing circuit, it is judged that icing is serious, starts direct current Deicing device, determines the ice melting current of circuit, carries out ice-melt.If in deicing processes, find that icing line ice-melting effect is poor, Need manual operation DC de-icing device, improve the ice melting current of circuit；In deicing processes, find the temperature monitoring system of icing circuit System displays temperature is too high, has the danger burning circuit, needs manual operation DC de-icing device, reduces the ice melting current of circuit, with On deicing processes need manual operation, use process loaded down with trivial details.

Summary of the invention

For the deficiencies in the prior art, the present invention provides a kind of ice melting system being automatically adjusted output electric current according to icing line temperature, The output electric current of ice-melt power supply can be automatically adjusted according to gathering icing line temperature and icing situation, have be automatically adjusted, logical The advantages such as letter is rapid, long-distance transmissions, adaptation adverse circumstances.

It is an object of the invention to use following technical proposals to realize:

A kind of ice melting system being automatically adjusted output electric current according to icing line temperature, it thes improvement is that, including:

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；

Described icing circuit is drawn by the DC side of described ice-melt power module, is connected to respectively obtain icing line conductor temperature The described temperature on-site supervision sensing module of data and passing for obtaining the described icing on-site supervision of icing line conductor external diameter data Sense module；

Described temperature on-site supervision sensing module is bi-directionally connected described optical fiber temperature grating adjustment module；

Described icing on-site supervision sensing module is bi-directionally connected described icing fiber grating adjustment module；

Described optical fiber temperature grating adjustment module and described icing fiber grating adjustment module connect described monitoring computing module respectively, Described monitoring computing module connects described ice-melt power module；

Preferably, described temperature data includes: conductor temperature T_i, ambient temperature T_eTemperature T with wire Yu ice interface₀；Institute State external diameter data to include: the outer diameter D after wire icing and wire diameter d.

Preferably, described temperature on-site supervision sensing module is bi-directionally connected described optical fiber temperature grating adjustment module and includes:

Described optical fiber temperature grating adjustment module is for by the way of erbium-doped fiber amplifier carries out light amplification to signal, to described Temperature on-site supervision sensing module send for gather the optical signal of described icing line conductor temperature data and reception carry described in cover The return signal of ice line conductor temperature data.

Preferably, described icing on-site supervision sensing module is bi-directionally connected described icing fiber grating adjustment module and includes:

Described icing fiber grating adjustment module is for by the way of erbium-doped fiber amplifier carries out light amplification to signal, to described Icing on-site supervision sensing module send for gather the optical signal of described icing line conductor external diameter data and reception carry described in cover The return signal of ice line conductor external diameter data.

Preferably, described optical fiber temperature grating adjustment module and described icing fiber grating adjustment module connect described monitoring meter respectively Calculating module, described monitoring computing module connects described ice-melt power module and includes:

Described monitoring computing module is for according to described temperature data, the heat balance equation (1-1) of described external diameter data and wire ice-melt Calculate ice-melt time t and the relation of ice melting current I and critical ice melting current I_C, and control to melt described in the output of described ice-melt power module Ice electric current I, output time is ice-melt time t；The heat balance equation (1-1) of described wire ice-melt is:

I²R₀T=Q₁+Q₂+Q₃+Q₄+Q₅ (1-1)

I: ice melting current；

R₀Conductor temperature is conductor resistance when 0 DEG C；

Q₁: it is melted the temperature of ice of part from wire ambient temperature T_eIt is warming up to temperature T of wire and ice interface₀Absorbed Heat；

Q₂: melt the required heat absorbed of ice；

Q₃: the heat that the ice temperature change not being melted absorbs；

Q₄: conductor temperature is from wire ambient temperature T_eIt is warming up to temperature T of wire and ice interface₀The heat absorbed；

Q₅: ice surface dispersed heat.

Further, described according to described temperature data, the heat balance equation (1-1) of described external diameter data and wire ice-melt calculates Critical ice melting current I_CIncluding:

$\begin{array}{c}{I}_C={\left[\frac{2\mathrm{\π}{k}_i(T_0-T_i)}{R_0\ln \left(\frac{D+2d}{D}\right)}\right]}^{\frac{1}{2}}={(\frac{2\mathrm{\π}{k}_i}{R_0\ln \frac{D_i}{D}}\×T_i)}^{\frac{1}{2}}-\frac{0.851075612T_i}{(T_i-T_e)\ln \left(\frac{D+2d}{D}\right)}=\\ 4.05503055\×{10}^{-8}(D+2d){(T_e+273)}^3+\{4.16942731463\×{10}^{-3}C\·R_e^n+{\left[\frac{(T_i-T_e){(D+2d)}^3}{\frac{(T_i+T_e)}{2}+273}\right]}^{0.25}\}\end{array}---(1-2)$

In formula (1-2), T_eFor wire ambient temperature, T₀For the temperature of wire Yu ice interface, T_iFor conductor temperature, D is for leading External diameter after line icing, d is wire diameter, R₀Conductor temperature is conductor resistance when 0 DEG C, R_eFor Reynolds number, k_iFor heat conduction system Number, n and C is environmental coefficient and confirms according to formula (1-3)；

Wherein, R_eFor Reynolds number, computing formula is:

$R_e=7.517442\&times;{10}^4{D}_i{v}_a,\left(\begin{array}{c}40\&le;R_e<4000,C=0.683,n=0.466\\ 4000\&le;R_e<40000,C=0.193,n=0.618\\ 40000\&le;R_e<400000,C=0.0266,n=0.805\end{array}\right)---(1-3)$

In formula (1-3), D_iFor ice layer thickness, v_aFor wind speed, n and C is environmental coefficient and confirms according to formula (1-3)；

Further, the relation calculating ice-melt time t and ice melting current I is:

$\begin{array}{c}t\&times;{10}^{-6}=\frac{3.01047574135d(D+d)-1.0540915D(0.1073D+d)}{2(I^2-I{c}^2)R_0}\&times;T_i+337.9145\&times;\frac{D(0.1073D+d)}{(I^2-I{c}^2)R_0}\\ -\frac{6.0209514827d(D+d)+2.444420A_{\mathrm{Al}}+3.698{9A}_{\mathrm{Fe}}}{(I^2-I{c}^2)R_0}\&times;T_e(I>I_c)\end{array}---(1-4)$

In formula, D is the external diameter after wire icing, and d is wire diameter, and I is ice melting current, I_CFor critical ice melting current, R₀ Conductor temperature is conductor resistance when 0 DEG C, T_iFor conductor temperature, T_eFor wire ambient temperature, A_AlAmass for wire aluminum cross section, A_FeAmass for wire steel cross section.

Preferably, described monitoring computing module is additionally operable to when conductor temperature exceedes limiting temperature, controls described ice-melt power module Stop output ice melting current.

Preferably, described icing circuit includes: transmission line of electricity and OPGW.

Preferably, described ice-melt power module includes: chopper, fuse, catalyst, current transformer, booster transformer, Silicon controlled rectifier, Hall current sensor and Hall voltage sensor；；

The outfan of electromotor or transformer station's power supply is sequentially connected with described chopper, fuse, catalyst, current transformer, liter Pressure transformer；Described silicon controlled rectifier includes: the first branch road, the second branch road and the 3rd branch road in parallel successively, wherein, and institute State the first branch road, the second branch road and the 3rd branch road and all include two IGCTs connected；The three-phase output end of described booster transformer It is connected with the junction point between in described first branch road, the second branch road and the 3rd branch road two IGCTs connected respectively；

Described Hall voltage sensor respectively with the first branch road, the second branch road and the 3rd branch circuit parallel connection of described silicon controlled rectifier； One end of described Hall current sensor connects one end of described Hall voltage sensor, the other end of described Hall current sensor It is connected with the outfan of described silicon controlled rectifier.

Beneficial effects of the present invention:

1. a kind of ice melting system being automatically adjusted output electric current according to icing line temperature of the present invention, wherein comprises temperature on-site supervision Sensing module, optical fiber temperature grating adjustment module, icing on-site supervision sensing module, icing fiber grating adjustment module, monitoring Computing module, ice-melt power module and icing circuit, monitoring computing module obtains the icing situation of icing circuit, timely and ice-melt Power module communication determines ice-melt time and the ice melting current of ice-melt power module, controls the output of ice-melt power module, and temperature is existing Monitoring sensing module monitors the temperature of icing circuit constantly, finds to exceed line temperature limit value, with DC de-icing device communication and Time stop ice-melt.

2. the present invention a kind of according to icing line temperature be automatically adjusted output electric current ice melting system can according to gather icing circuit temperature Degree and icing situation, be automatically adjusted the output electric current of ice-melt power supply, have be automatically adjusted, communicate rapidly, long-distance transmissions, suitable Answer the advantages such as adverse circumstances.

Accompanying drawing explanation

Fig. 1 is the system structure schematic diagram of a kind of ice melting system being automatically adjusted output electric current according to icing line temperature of the present invention；

Fig. 2 is amplifying based on unidirectional EDFA of a kind of ice melting system being automatically adjusted output electric current according to icing line temperature of the present invention The structural representation of overlength sensing solutions；

Fig. 3 is amplifying based on two-way EDFA of a kind of ice melting system being automatically adjusted output electric current according to icing line temperature of the present invention The structural representation of overlength sensing solutions；

Fig. 4 is the ice-melt power module circuitry of a kind of ice melting system being automatically adjusted output electric current according to icing line temperature of the present invention Connection diagram.

Detailed description of the invention

Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is elaborated.

For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, attached below in conjunction with in the embodiment of the present invention Figure, is clearly and completely described the technical scheme in the embodiment of the present invention, it is clear that described embodiment is the present invention A part of embodiment rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having Make all other embodiments obtained under creative work premise, broadly fall into the scope of protection of the invention.

A kind of ice melting system being automatically adjusted output electric current according to icing line temperature, as it is shown in figure 1, described system includes:

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；

Described icing circuit is drawn by the DC side of described ice-melt power module, is connected to respectively obtain icing line conductor temperature The described temperature on-site supervision sensing module of data and passing for obtaining the described icing on-site supervision of icing line conductor external diameter data Sense module；

Wherein, described temperature data includes: conductor temperature T_i, ambient temperature T_oTemperature T with wire Yu ice interface₀；Described External diameter data include: the outer diameter D after wire icing and wire diameter d.

Described temperature on-site supervision sensing module is bi-directionally connected described optical fiber temperature grating adjustment module；

Described optical fiber temperature grating adjustment module is for by the way of erbium-doped fiber amplifier carries out light amplification to signal, to described Temperature on-site supervision sensing module send for gather the optical signal of described icing line conductor temperature data and reception carry described in cover The return signal of ice line conductor temperature data.

Described icing on-site supervision sensing module is bi-directionally connected described icing fiber grating adjustment module；

Described icing fiber grating adjustment module is for by the way of erbium-doped fiber amplifier carries out light amplification to signal, to described Icing on-site supervision sensing module send for gather the optical signal of described icing line conductor external diameter data and reception carry described in cover The return signal of ice line conductor external diameter data.

Owing to the current practical fiber grating sensing system single-ended distance sensing of supported maximum is about 30km-40km, it is not enough to Cover most of transmission line length.The application, by the way of using erbium-doped optical fiber amplifier EDFA to carry out light amplification, is put Big fiber Bragg grating (FBG) demodulator input/output optical signal power, improves fiber grating sensing system coverage, it is achieved single-ended sensing is surveyed Span is from can reach the target of 120km not less than 60km, both-end sensing measurement distance, thus it is defeated to substantially meet the current overwhelming majority The sensing measurement required distance of electric line.

Such as, as in figure 2 it is shown, the overlength sensing solutions amplified based on unidirectional EDFA, by fiber Bragg grating (FBG) demodulator is exported light The amplification of signal, and then increase the optical power budget of fiber Bragg grating (FBG) demodulator, thus increase its light that can support sensing and cover Lid scope；

As it is shown on figure 3, the overlength sensing solutions amplified based on two-way EDFA, by fiber Bragg grating (FBG) demodulator output optical signal and Fiber-optic grating sensor reflected light signal carries out Bi-directional amplifier, and then increases the light merit of fiber Bragg grating (FBG) demodulator to a greater extent Rate budget, it is achieved that the sensing coverage that fiber Bragg grating (FBG) demodulator is bigger.

In view of the feature of the application and described optical fiber temperature grating adjustment module and described icing fiber grating adjustment module respectively with Described optical fiber temperature grating adjustment module and the line length of described icing fiber grating adjustment module data transmission, monitoring calculates mould Block uses 1 DTS 200-240 (22 kilometer of 4 passage), uses single-ended connected mode that transmission line of electricity running temperature is carried out reality Time monitoring.First monitoring calculating center calculates, according to the formula of ice melting current, the ice melting current that OPGW passes through, and produces heat and makes icing The reference ice melting current melted；Further according to landform, weather, icing situation (character, shape, ice thickness), OPGW structure with melt The differences such as ice method, allow the ice melting current by OPGW by OPGW optics, mechanical property test analysis.

Simultaneously according to the temperature information recorded, grasp conductor temperature along the line, the stress of the line ice coating of long term accumulation and Temperature Datum Foundation can be provided to the operation of transmission line of electricity and design.

Described optical fiber temperature grating adjustment module and described icing fiber grating adjustment module connect described monitoring computing module respectively, Described monitoring computing module connects described ice-melt power module；

Described monitoring computing module is for according to described temperature data, described external diameter data and the heat balance equation (1-1) of wire ice-melt Calculate ice-melt time t and the relation of ice melting current I and critical ice melting current I_C, and it is described to control the output of described ice-melt power module Ice melting current I, output time is ice-melt time t；

Wherein, described ice-melt principle formula (1-1) is:

I²R₀T=Q₁+Q₂+Q₃+Q₄+Q₅ (1-1)

I: ice melting current；

R₀Conductor temperature is conductor resistance when 0 DEG C；

Q₁: it is melted the temperature of ice of part from wire ambient temperature T_eIt is warming up to temperature T of wire and ice interface₀Absorbed Heat；

Q₂: melt the required heat absorbed of ice；

Q₃: the heat that the ice temperature change not being melted absorbs；

Q₄: conductor temperature is from wire ambient temperature T_eIt is warming up to temperature T of wire and ice interface₀The heat absorbed；

Q₅: ice surface dispersed heat.

The described heat balance equation (1-1) according to described temperature data, described external diameter data and wire ice-melt can derive critical melting Ice electric current I_CFor:

$\begin{array}{c}{I}_C={\left[\frac{2\mathrm{\&pi;}{k}_i(T_0-T_i)}{R_0\ln \left(\frac{D+2d}{D}\right)}\right]}^{\frac{1}{2}}={(\frac{2\mathrm{\&pi;}{k}_i}{R_0\ln \frac{D_i}{D}}\&times;T_i)}^{\frac{1}{2}}-\frac{0.851075612T_i}{(T_i-T_e)\ln \left(\frac{D+2d}{D}\right)}=\\ 4.05503055\&times;{10}^{-8}(D+2d){(T_e+273)}^3+\{4.16942731463\&times;{10}^{-3}C\&CenterDot;R_e^n+{\left[\frac{(T_i-T_e){(D+2d)}^3}{\frac{(T_i+T_e)}{2}+273}\right]}^{0.25}\}\end{array}---(1-2)$

In formula (1-2), T_eFor wire ambient temperature, T₀For the temperature of wire Yu ice interface, T_iFor conductor temperature, D is for leading External diameter after line icing, d is wire diameter, R₀Conductor temperature is conductor resistance when 0 DEG C, R_eFor Reynolds number, k_iFor heat conduction system Number, n and C is environmental coefficient and confirms according to formula (1-3)；

Wherein, R_eFor Reynolds number, computing formula is:

$R_e=7.517442\&times;{10}^4{D}_i{v}_a,\left(\begin{array}{c}40\&le;R_e<4000,C=0.683,n=0.466\\ 4000\&le;R_e<40000,C=0.193,n=0.618\\ 40000\&le;R_e<400000,C=0.0266,n=0.805\end{array}\right)---(1-3)$

In formula (1-3), D_iFor ice layer thickness, v_aFor wind speed, n and C is environmental coefficient and confirms according to formula (1-3)；

The relation calculating ice-melt time t and ice melting current I according to formula (1-4) is:

$\begin{array}{c}t\&times;{10}^{-6}=\frac{3.01047574135d(D+d)-1.0540915D(0.1073D+d)}{2(I^2-I{c}^2)R_0}\&times;T_i+337.9145\&times;\frac{D(0.1073D+d)}{(I^2-I{c}^2)R_0}\\ -\frac{6.0209514827d(D+d)+2.444420A_{\mathrm{Al}}+3.6989A_{\mathrm{Fe}}}{(I^2-I{c}^2)R_0}\&times;T_e(I>I_c)\end{array}---(1-4)$

In formula, D is the external diameter after wire icing, and d is wire diameter, and I is ice melting current, I_CFor critical ice melting current, R₀Lead Line temperature is conductor resistance when 0 DEG C, T_iFor conductor temperature, T_eFor wire ambient temperature, A_AlAmass for wire aluminum cross section, A_Fe Amass for wire steel cross section.

Described monitoring computing module is additionally operable to when conductor temperature exceedes limiting temperature, controls described ice-melt power module and stops output Ice melting current, described limiting temperature can be manually set according to the practical situation of wire.

Described icing circuit includes: transmission line of electricity and OPGW.

Described ice-melt power module, as described in Figure 4, including: chopper, fuse, catalyst, current transformer, boosting Transformator, silicon controlled rectifier, Hall current sensor and Hall voltage sensor；

The outfan of electromotor or transformer station's power supply is sequentially connected with described chopper, fuse, catalyst, current transformer, liter Pressure transformer；Described silicon controlled rectifier includes: the first branch road, the second branch road and the 3rd branch road in parallel successively, wherein, and institute State the first branch road, the second branch road and the 3rd branch road and all include two IGCTs connected；The three-phase output end of described booster transformer Connect respectively in described first branch road, the second branch road and the 3rd branch road between the IGCTs of two series connection；

Described Hall voltage sensor respectively with the first branch road, the second branch road and the 3rd branch circuit parallel connection of described silicon controlled rectifier； One end of described Hall current sensor connects one end of described Hall voltage sensor, the other end of described Hall current sensor It is connected with the outfan of described silicon controlled rectifier.

Wherein, described booster transformer.Acting primarily as the effects such as isolation, boosting, wiring is Y/D11 mode；Silicon controlled rectifier The main convertor equipment of ice melting system, provides DC ice melting current for icing circuit, by changing touching of gate tube valve in deicing processes Send out angle and carry out adjusting circuit DC current；Described chopper and catalyst, can realize functions such as normal drop-out currents.

Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although reference The present invention has been described in detail by above-described embodiment, those of ordinary skill in the field it is understood that still can to this Invention detailed description of the invention modify or equivalent, and without departing from spirit and scope of the invention any amendment or etc. With replacing, it all should be contained within the claims of the present invention.

Claims (10)

1. the ice melting system being automatically adjusted output electric current according to icing line temperature, it is characterised in that described system includes:

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；

Described icing circuit is drawn by the DC side of described ice-melt power module, is connected to respectively obtain icing line conductor temperature The described temperature on-site supervision sensing module of data and passing for obtaining the described icing on-site supervision of icing line conductor external diameter data Sense module；

Described temperature on-site supervision sensing module is bi-directionally connected described optical fiber temperature grating adjustment module；

Described icing on-site supervision sensing module is bi-directionally connected described icing fiber grating adjustment module；

Described optical fiber temperature grating adjustment module and described icing fiber grating adjustment module connect described monitoring computing module respectively, Described monitoring computing module connects described ice-melt power module.

2. the system as claimed in claim 1, it is characterised in that described temperature data includes: conductor temperature T_i, ambient temperature T_eTemperature T with wire Yu ice interface₀；Described external diameter data include: the outer diameter D after wire icing and wire diameter d.

3. the system as claimed in claim 1, it is characterised in that described temperature on-site supervision sensing module is bi-directionally connected described temperature Degree fiber grating adjustment module includes:

Described optical fiber temperature grating adjustment module is used for by erbium-doped fiber amplifier being used for gathering described icing line conductor temperature The optical signal of data and carry out light amplification for carrying the return signal of described icing line conductor temperature data, existing to described temperature Field monitoring sensing module sends the optical signal for gathering described icing line conductor temperature data and described icing circuit is carried in reception The return signal of conductor temperature data.

4. the system as claimed in claim 1, it is characterised in that described icing on-site supervision sensing module be bi-directionally connected described in cover Ice fiber grating adjustment module includes:

Described icing fiber grating adjustment module is used for by erbium-doped fiber amplifier being used for gathering described icing line conductor external diameter The optical signal of data and carry out light amplification for carrying the return signal of described icing line conductor external diameter data, existing to described icing Field monitoring sensing module sends the optical signal for gathering described icing line conductor external diameter data and described icing circuit is carried in reception The return signal of wire diameter data.

5. the system as claimed in claim 1, it is characterised in that described optical fiber temperature grating adjustment module and described icing optical fiber Grating adjustment module connects described monitoring computing module respectively, and described monitoring computing module connects described ice-melt power module and includes:

Described monitoring computing module is for according to described temperature data, the heat balance equation (1-1) of described external diameter data and wire ice-melt Calculate ice-melt time t and the relation of ice melting current I and critical ice melting current I_c, and it is described to control the output of described ice-melt power module Ice melting current I, output time is ice-melt time t；The heat balance equation (1-1) of described wire ice-melt is:

I²R₀T=Q₁+Q₂+Q₃+Q₄+Q₅ (1-1)

I: ice melting current；

R₀Conductor temperature is conductor resistance when 0 DEG C；

Q₁: it is melted the temperature of ice of part from wire ambient temperature T_eIt is warming up to temperature T of wire and ice interface₀Absorbed Heat；

Q₂: melt the required heat absorbed of ice；

Q₃: the heat that the ice temperature change not being melted absorbs；

Q₄: conductor temperature is from wire ambient temperature T_eIt is warming up to temperature T of wire and ice interface₀The heat absorbed；

Q₅: ice surface dispersed heat.

6. system as claimed in claim 5, it is characterised in that according to described temperature data, described external diameter data and wire melt The heat balance equation (1-1) of ice calculates critical ice melting current I_cIncluding:

$\begin{array}{c}{I}_C={\left[\frac{{2\mathrm{\&pi;k}}_i(T_0-T_i)}{R_0\ln \left(\frac{D+2d}{D}\right)}\right]}^{\frac{1}{2}}={(\frac{{2\mathrm{\&pi;k}}_i}{R_0\ln \frac{D_i}{D}}\&times;T_i)}^{\frac{1}{2}}-\frac{0.851075612T_i}{(T_i-T_e)\ln \left(\frac{D+2d}{D}\right)}=\\ 4.05503055\&times;{10}^{-8}(D+2d){(T_e+273)}^3+\{4.16942731463\&times;{10}^{-3}C\&CenterDot;R_e^n+{\left[\frac{(T_i-T_e){(D+2d)}^3}{\frac{(T_i+T_e)}{2}+273}\right]}^{0.25}\}\end{array}---(1-2)$

In formula (1-2), T_eFor wire ambient temperature, T₀For the temperature of wire Yu ice interface, T_iFor conductor temperature, D is for leading External diameter after line icing, d is wire diameter, R₀Conductor temperature is conductor resistance when 0 DEG C, R_eFor Reynolds number, k_iFor heat conduction system Number, n and C is environmental coefficient and confirms according to formula (1-3)；

Wherein, R_eFor Reynolds number, computing formula is:

$R_e=7.517442\&times;{10}^4{D}_i{v}_a,\left(\begin{array}{c}40\&le;R_e<4000,C=0.683,n=0.466\\ 4000\&le;R_e<40000,C=0.193,n=0.618\\ 40000\&le;R_e<400000,C=0.0266,n=0.805\end{array}\right)---(1-3)$

In formula (1-3), D_iFor ice layer thickness, v_aFor wind speed, n and C is environmental coefficient and confirms according to formula (1-3).

7. system as claimed in claim 6, it is characterised in that the relation calculating ice-melt time t and ice melting current I is:

$\begin{array}{c}t\&times;{10}^{-6}=\frac{3.01047574135d(D+d)-1.0540915D(0.1073D+d)}{2(I^2-{\mathrm{Ic}}^2)R_0}\&times;T_i+337.9145\&times;\frac{D(0.1073D+d)}{(I^2-{\mathrm{Ic}}^2)R_0}\\ -\frac{6.0209514827d(D+d)+2.444420A_{\mathrm{Al}}+3.6989A_{\mathrm{Fe}}}{(I^2-{\mathrm{Ic}}^2)R_0}\&times;T_e(I>I_c)\end{array}---(1-4)$

In formula, D is the external diameter after wire icing, and d is wire diameter, and I is ice melting current, I_CFor critical ice melting current, R₀Lead Line temperature is conductor resistance when 0 DEG C, T_iFor conductor temperature, T_eFor wire ambient temperature, A_AlAmass for wire aluminum cross section, A_Fe Amass for wire steel cross section.

8. the system as claimed in claim 1, it is characterised in that described monitoring computing module is additionally operable to when conductor temperature exceedes limit During fixed temperature, control described ice-melt power module and stop output ice melting current.

9. the system as claimed in claim 1, it is characterised in that described icing circuit includes: transmission line of electricity and Optical Fiber Composite frame Vacant lot line.

10. the system as claimed in claim 1, it is characterised in that described ice-melt power module includes: chopper, fuse, Catalyst, current transformer, booster transformer, silicon controlled rectifier, Hall current sensor and Hall voltage sensor；

The outfan of electromotor or transformer station's power supply is sequentially connected with described chopper, fuse, catalyst, current transformer, liter Pressure transformer；Described silicon controlled rectifier includes: the first branch road, the second branch road and the 3rd branch road in parallel successively, wherein, and institute State the first branch road, the second branch road and the 3rd branch road and all include two IGCTs connected；The three-phase output end of described booster transformer It is connected with the junction point between in described first branch road, the second branch road and the 3rd branch road two IGCTs connected respectively；

Described Hall voltage sensor respectively with the first branch road, the second branch road and the 3rd branch circuit parallel connection of described silicon controlled rectifier； One end of described Hall current sensor connects one end of described Hall voltage sensor, the other end of described Hall current sensor It is connected with the outfan of described silicon controlled rectifier.