CN107179332B - A kind of transmission line de-icing time calculation method considering moisture film - Google Patents
A kind of transmission line de-icing time calculation method considering moisture film Download PDFInfo
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- CN107179332B CN107179332B CN201710349822.4A CN201710349822A CN107179332B CN 107179332 B CN107179332 B CN 107179332B CN 201710349822 A CN201710349822 A CN 201710349822A CN 107179332 B CN107179332 B CN 107179332B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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Abstract
The invention discloses a kind of transmission line de-icing time calculation methods for considering moisture film, it includes the following steps: (1) conductor temperature T before ice-melt startsw, Ice Temperature Ti, the temperature T of environmenteIt is identical to be set as Ts；Step 2, the area A for calculating ice-melt regionmWith the area A in remaining ice formation domainr；Step 3 calculates conducting wire from temperature TwThe heat Q of absorption required for rising to 0 DEG C1；Step 4 calculates ice from temperature TiThe heat Q of absorption required for rising to 0 DEG C2；Step 5, calculating ice continue absorption heat and are melted into water；Step 6 calculates the heat Q that remaining ice sheet absorbs4；Step 7 calculates ice sheet surface institute dispersed heat Q5；Step 8 calculates ice-melt time t；The present invention keeps deicing processes calorimetric analysis more accurate, so as to the parameters such as heat and ice-melt time required for more acurrate calculating electro-heat deicing；Theoretical foundation is provided for the design of transmission line of electricity electro-heat deicing apparatus and the selection of ice-melt scheme.
Description
Technical field
The invention belongs to transmission line de-icing technologies；More particularly to a kind of transmission line de-icing time for considering moisture film calculates
Method.
Background technique
The electro-heat deicing computation model of transmission line of electricity is the theoretical basis for designing deicing device and selecting ice-melt scheme, rationally
Ice-melt model be conducive to study influence of each impact factor to deicing processes, for select ice-melt driving source parameter and calculating melt
The ice time provides theoretical foundation, is of great significance for improving the ability of power grid prevention ice damage accident and improving de-icing technology.
The prior art has focused largely on the forming process and influence condition of icing to powerline ice-covering research, to power transmission line
The research of road deicing processes and electro-heat deicing characteristic is less.In existing ice-melt model, generally using cylinder model and
The moisture film generated in deicing processes is not taken into account；In fact, being covered since the ice cover in windward side than leeward side more
The shape of ice can generate certain thickness moisture film when ice sheet melts closer to ellipse, and the heat transfer of moisture film and ice
It is different；The prior art does not consider these factors, leads to the practicability of transmission pressure ice-melt computation model and calculates accuracy
It is poor.
Summary of the invention:
The technical problem to be solved in the present invention: a kind of transmission line de-icing time calculation method for considering moisture film is provided；With
The transmission line de-icing model of the prior art is solved using cylinder model and does not examine the moisture film generated in deicing processes
Including worry；Certain thickness moisture film can be generated when ice sheet melts simultaneously, and moisture film is different from the heat transfer of ice；The prior art is simultaneously
These factors are not accounted for, the practicability of transmission pressure ice-melt computation model is caused and calculate the technical problems such as accuracy is poor.
Technical solution of the present invention:
A kind of transmission line de-icing time calculation method considering moisture film, it includes:
Conductor temperature T before step 1, ice-melt startw, Ice Temperature Ti, the temperature T of environmenteIt is identical to be set as Ts
Tw=Ti=Te=Ts (1)
Step 2, the area A for calculating ice-melt regionmWith the area A in remaining ice formation domainr
Ar=π ab- π r2-Am (3)
Step 3 calculates conducting wire from temperature TwThe heat Q of absorption required for rising to 0 DEG C1
Q1=cwρwAw(0-Tw) (4)
C in formulawFor the specific heat capacity of conducting wire, ρwFor wire density, AwFor wire cross-section area；
Step 4 calculates ice from temperature TiThe heat Q of absorption required for rising to 0 DEG C2
Q2=ciρiAm(0-Ts) (5)
C in formulaiFor the specific heat capacity of ice, ρiFor the density of ice；
Step 5, calculating ice continue absorption heat and are melted into water, institute calorific requirement Q3
Q3=ρiAmLi (6)
L in formulaiFor the latent heat of ice；
Step 6 calculates the heat Q that remaining ice sheet absorbs4
Q4=ciρiAr(0-Ts/2) (7)
Step 7 calculates ice sheet surface institute dispersed heat Q5
In formula: hc, hrRespectively heat loss through convection coefficient and radiant heat coefficient；Heat loss through convection QcWith heat loss through radiation Qa；Ti(θ) and
di(θ) is respectively the temperature and ice layer thickness of ice sheet outer surface corresponding to angle, θ, and the two is all the function of angle, θ.
Step 8 calculates ice-melt time t
In formula: I is ice melting current, and ρ is conductor resistance rate, and l is conductor length, dr0For resistance infinitesimal.
Beneficial effects of the present invention:
The present invention provides a kind of two-dimentional calculating of ellipse that transmission line of electricity electro-heat deicing consideration deicing processes generate moisture film influence
Method.Start forward sight conducting wire in ice-melt and ice sheet is identical as environment temperature, and conducting wire is the good conductor of heat, is regarded in deicing processes
Conducting wire is isothermal body.It is as shown in Figure 1 four-stage: first stage by the formation of icing and deicing processes, ellipse icing,
Under the influence of wind, the icing of the windward side of wire icing is more than leeward side；Second stage, ice-melt generate moisture film, and ice-melt is opened
After beginning, conductor temperature is raised to the ice sheet inner surface for melting first after 0I and directly contacting with conducting wire, generates the moisture film with a thickness of x；The
In three stages, ice sheet rotation, icicle is vertically moving under gravity；Fourth stage, ice sheet fall off, with ice-melt
Continue, conducting wire is considered as ice-melt when rising to apart from upper one water film thickness in ice sheet outer surface and terminates.
Technical characterstic of the invention:
Deicing processes are divided into ellipse icing, ice-melt generates conducting wire-moisture film, ice sheet rotation, ice sheet fall off four ranks
Section, embodies the rule and characteristic during transmission pressure electro-heat deicing.
Influence of the moisture film to deicing processes is considered, ice water in deicing processes is embodied and mixes thermal characteristics, calculate ice-melt
Model is more reasonable.
The present invention reasonably simulates transmission pressure electro-heat deicing process, keeps deicing processes calorimetric analysis more accurate, from
And it can the parameters such as heat and ice-melt time required for more acurrate calculating electro-heat deicing.For transmission line of electricity electro-heat deicing apparatus design with
The selection of ice-melt scheme provides theoretical foundation, is of great significance to prevention Ice Disaster in Power Grids accident and raising de-icing technology；It solves
The transmission line de-icing model of the prior art is not using cylinder model and by the consideration of the moisture film that generates in deicing processes
Inside；Certain thickness moisture film can be generated when ice sheet melts simultaneously, and moisture film is different from the heat transfer of ice；The prior art is not
Have and consider these factors, lead to the practicability of transmission pressure ice-melt computation model and calculates the technical problems such as accuracy is poor.
Detailed description of the invention:
Fig. 1 is transmission line de-icing process model schematic diagram of the present invention.
Specific embodiment:
The present invention provides a kind of transmission line de-icing time calculation method for considering moisture film.Ice-melt start forward sight conducting wire and
Ice sheet is identical as environment temperature, and conducting wire is the good conductor of heat, regards conducting wire in deicing processes as isothermal body.As shown in Figure 1 will
The formation of icing and deicing processes are four-stage: first stage, ellipse icing, under the influence of wind, wire icing
The icing of windward side is more than leeward side；Second stage, ice-melt generates moisture film, and after ice-melt starts, conductor temperature is raised to head after 0I
First melt the ice sheet inner surface directly contacted with conducting wire, generates the moisture film with a thickness of x；Phase III, ice sheet rotation, in gravity
It is vertically moving to act on lower icicle；Fourth stage, ice sheet fall off, and with the continuation of ice-melt, conducting wire is risen to apart from upper ice
Being considered as ice-melt when layer one water film thickness in outer surface terminates.Wherein set moisture film with a thickness of x, the radius of conducting wire is r, oval
The major semiaxis and semi-minor axis of icing are respectively a, b；Ti (θ) is the temperature of corresponding ice sheet outer surface at the θ of angle；D θ is micro- angle member.
A kind of transmission line de-icing time calculation method considering moisture film, it includes:
Conductor temperature T before step 1, ice-melt startw, Ice Temperature Ti, the temperature T of environmenteIt is identical to be set as Ts
Tw=Ti=Te=Ts (1)
Step 2, the area A for calculating ice-melt regionmWith the area A in remaining ice formation domainr
Ar=π ab- π r2-Am (3)
Step 3 calculates conducting wire from temperature TwThe heat Q of absorption required for rising to 0 DEG C1
Q1=cwρwAw(0-Tw)(4)
C in formulawFor the specific heat capacity of conducting wire, ρwFor wire density, AwFor wire cross-section area.
Step 4 calculates ice from temperature TiThe heat Q of absorption required for rising to 0 DEG C2
Q2=ciρiAm(0-Ts) (5)
C in formulaiFor the specific heat capacity of ice, ρiFor the density of ice.
Step 5, calculating ice continue absorption heat and are melted into water, institute calorific requirement Q3
Q3=ρiAmLi (6)
L in formulaiFor the latent heat of ice；
Step 6 calculates the heat Q that remaining ice sheet absorbs4
Q4=ciρiAr(0-Ts/2) (7)
Step 7 calculates ice sheet surface institute dispersed heat Q5
In formula: hc, hrRespectively heat loss through convection coefficient and radiant heat coefficient；Heat loss through convection QcWith heat loss through radiation Qa；Ti(θ) and
di(θ) is respectively the temperature and ice layer thickness of ice sheet outer surface corresponding to angle, θ, and the two is all the function of angle, θ.
Step 8 calculates ice-melt time t
In formula: I is ice melting current, and ρ is conductor resistance rate, and l is conductor length, dr0For resistance infinitesimal.
Claims (1)
1. a kind of transmission line de-icing time calculation method for considering moisture film, it includes:
Conductor temperature T before step 1, ice-melt startw, Ice Temperature Ti, the temperature T of environmenteIt is identical to be set as Ts
Tw=Ti=Te=Ts (1)
Step 2, the area A for calculating ice-melt regionmWith the area A in remaining ice formation domainr
Ar=π ab- π r2-Am (3)
Step 3 calculates conducting wire from temperature TwThe heat Q of absorption required for rising to 0 DEG C1
Q1=cwρwAw(0-Tw) (4)
C in formulawFor the specific heat capacity of conducting wire, ρ w is wire density, AwFor wire cross-section area；
Step 4 calculates ice from temperature TiThe heat Q of absorption required for rising to 0 DEG C2
Q2=ciρiAm(0-Ts) (5)
C in formulaiFor the specific heat capacity of ice, ρ i is the density of ice；
Step 5, calculating ice continue absorption heat and are melted into water, institute calorific requirement Q3
Q3=ρiAmLi (6)
L in formulaiFor the latent heat of ice；
Step 6 calculates the heat Q that remaining ice sheet absorbs4
Q4=ciρiAr(0-Ts/2) (7)
Step 7 calculates ice sheet surface institute dispersed heat Q5
In formula: hc, hrRespectively heat loss through convection coefficient and radiant heat coefficient, heat loss through convection QcWith heat loss through radiation Qa, Ti(θ) and di
(θ) is respectively the temperature and ice layer thickness of ice sheet outer surface corresponding to angle, θ, and the two is all the function of angle, θ；
Step 8 calculates ice-melt time t
In formula: I is ice melting current, and ρ is conductor resistance rate, and l is conductor length, dr0For resistance infinitesimal.
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| 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 |
| CN111060509B (en) * | 2019-12-27 | 2021-05-07 | 四川大学 | Method and device for simulating ice-hang raw and consumed food and measuring raw and consumed food rate |
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| CN101656407B (en) * | 2009-08-18 | 2011-11-09 | 国家电网公司 | Method and device for preventing ice coating in electric transmission line |
| US20120006804A1 (en) * | 2010-07-09 | 2012-01-12 | Karen Lea Jenkins | Electrically Heated Push Device for Clearing Accumulated Snow and Ice |
| CN106300199B (en) * | 2015-05-29 | 2018-05-04 | 国家电网公司 | A kind of ice melting system that output current is automatically adjusted according to icing line temperature |
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