CN105205202B - A kind of carrying current calculation method - Google Patents
A kind of carrying current calculation method Download PDFInfo
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- CN105205202B CN105205202B CN201510413551.5A CN201510413551A CN105205202B CN 105205202 B CN105205202 B CN 105205202B CN 201510413551 A CN201510413551 A CN 201510413551A CN 105205202 B CN105205202 B CN 105205202B
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Abstract
A kind of current-carrying capacity of cable computational methods, it provides a kind of finite element algorithm having using finite element software as instrument, including the simulation calculation in Cable Group temperature field and the two big step of numerical computations using temperature field as the current-carrying capacity of condition.The problem of present invention be when can solve to calculate the current-carrying capacity of cable using existing method, and calculating process is difficult, data that are cumbersome and obtaining are inaccurate.
Description
Technical field
The invention belongs to electrical and information engineering field, and in particular to a kind of current-carrying capacity of cable computational methods.
Background technology
The current-carrying capacity of cable is an important parameter for determining cable transmission ability, and it refers to that cable core temperature reaches 90
DEG C when steady state operating current.Its importance is related to safe and reliable, economical rationality operation and the cable longevity of transmission line of electricity
Life problem.The current-carrying capacity of cable is bigger than normal, and cable core operating temperature can be caused to exceed permissible value, and the life-span of insulation will contract than desired value
It is short；Current-carrying capacity is less than normal, then cable core copper material or aluminium cannot be fully utilized, and cause unnecessary waste.Current-carrying capacity
Determination the problem of being one difficult and cumbersome, especially for the occasion that service condition is complicated, if any substantial amounts of directly buried installation
And the situation of comb laying.With the development of the city, the application of these system of layings is more and more extensive, and cable laying is intensive
Also more and more higher, the environment of operation also become more complicated to degree.Traditional calculating current-carrying capacity method is based on IEC60287
Analytical Calculation, it have ignored the kindred effect between loop, and cable conductor is visualized as isothermal level, ignore the influence of soil moisture
Deng, exist many deficiency.Therefore many experts and scholars start to be directed to the iterative method based on numerical computations, although iterative method from
The exact value of current-carrying capacity can be obtained in theory, but in actual calculating process, iteration is required for doing a finite element each time
Emulation, if iteration convergence comparatively fast may only need to do finite element simulation several times and can be obtained by preferable result, otherwise need
Do tens of times or even hundreds of secondary finite element stimulations.
The content of the invention
The technical problems to be solved by the invention are to be directed to above-mentioned the deficiencies in the prior art, and a kind of cable current-carrying provided
Measure computational methods, when it can solve to calculate the current-carrying capacity of cable using existing method, calculating process is difficult, it is cumbersome and
The problem of obtained data are inaccurate.
What the purpose of invention was realized in：
A kind of carrying current calculation method, it comprises the following steps：
First, computation model cell type is defined；
2nd, according to cable material and laying Environment Definition material properties；
3rd, cable-soil-air aggregation model is established；
4th, model is carried out folded point of operation and assigns characteristic to model to make the different Element of model by Boolean calculation
Corresponding corresponding material properties；
5th, FEM meshing；
6th, load and constraint are applied；
7th, solve and obtain model temperature cloud charts；
8th, apply multigroup electric current and obtain corresponding Temperature Distribution cloud atlas, i.e., multigroup conductor temperature value；
9th, multigroup current value and multigroup conductor temperature value can try to achieve corresponding letter of the conductor temperature with conductor current more than
Number；
Tenth, current value i.e. current-carrying capacity corresponding to 90 DEG C of conductor temperature is tried to achieve according to superior function.
2nd, carrying current calculation method according to claim 1, it is characterised in that：The numerical computations of the current-carrying capacity are
Curve matching calculates.
3rd, carrying current calculation method according to claim 1, it is characterised in that：The material properties and laying environment
Specifically include thermal conductivity factor, density, modulus of elasticity, cable laying depth, air themperature, the soil moisture, cable spacing arrangement side
Formula.
Using above-mentioned computational methods, following beneficial effect is obtained：Computational methods eliminate cumbersome and are difficult to what is accurately calculated
Thermal resistance parameters, while the alternating current resistance that need not also calculate conductor can obtain the current-carrying capacity and temperature at a temperature of varying environment
Parameter, and the current-carrying capacity Comparative result IEC standard calculated is closer to actual value, so that the safety and economy of transmission line of electricity
And its life problems has preferable guarantee, ensure to improve the transmission capacity of transmission line of electricity on the premise of safety to greatest extent,
Control transmission line of electricity loading current for a long time in the range of current-carrying capacity permission effective operation reduction cable aging accident, or even subtract
Fire incident caused by few cable.
Embodiment
A kind of carrying current calculation method, it comprises the following steps：
First, computation model cell type is defined；
2nd, according to cable material and laying Environment Definition material properties；
3rd, cable-soil-air aggregation model is established；
4th, model is carried out folded point of operation and assigns characteristic to model to make the different Element of model by Boolean calculation
Corresponding corresponding material properties；
5th, FEM meshing；
6th, load and constraint are applied；
7th, solve and obtain model temperature cloud charts；
8th, apply multigroup electric current and obtain corresponding Temperature Distribution cloud atlas, i.e., multigroup conductor temperature value；
9th, multigroup current value and multigroup conductor temperature value can try to achieve corresponding letter of the conductor temperature with conductor current more than
Number；
Tenth, current value i.e. current-carrying capacity corresponding to 90 DEG C of conductor temperature is tried to achieve according to superior function.
The numerical computations of the current-carrying capacity calculate for curve matching.
The material properties and laying environment specifically include thermal conductivity factor, density, modulus of elasticity, cable laying depth, sky
Temperature degree, the soil moisture, cable spacing arrangement.
With YJLW02-64/110kv.1 × 300mm2Exemplified by cable calculates：Construction of cable parameter such as subordinate list 1, cable laying
Condition such as subordinate list 2, cable material parameter such as subordinate list 3.
Its cell type is the node two-order unit of plane 6 first defined in Ansys softwares；Set according to the material parameter of table 3
Put material properties；Two dimensional model is so built according to the cable laying condition of table 2 and the construction of cable parameter of table 1；Boolean calculation is folded
Divide operation and assigning characteristic to model makes the different material layer of model correspond to corresponding material properties；To FEM model grid
Division；Loading and application constraints；Calculate solution and obtain cable temperature cloud charts.Repeatedly time loading current obtains multigroup lead
Body temperature angle value can be fitted conductor temperature and the respective function curve of conductor current；It is right that 90 DEG C of conductor temperature is tried to achieve according to function curve
The current value answered i.e. current-carrying capacity.
The construction of cable parameter of table 1
The cable laying condition of table 2
The cable material property parameters of table 3
Claims (2)
- A kind of 1. carrying current calculation method, it is characterised in that it comprises the following steps：First, computation model cell type is defined；2nd, according to cable material and laying Environment Definition material properties；3rd, cable-soil-air aggregation model is established；4th, model is carried out folded point of operation and makes the different Element of model corresponding model imparting characteristic by Boolean calculation AccordinglyMaterial properties；5th, FEM meshing；6th, load and constraint are applied；7th, solve and obtain model temperature cloud charts；8th, apply multigroup electric current and obtain corresponding Temperature Distribution cloud atlas, i.e., multigroup conductor temperature value；9th, multigroup current value and multigroup conductor temperature value are fitted to obtain the respective function of conductor temperature and conductor current more than Curve；Tenth, the current value i.e. current-carrying capacity according to corresponding to above function curve tries to achieve 90 °C of conductor temperature.
- 2. the carrying current calculation method according to claim 1, it is characterised in that：The material properties and laying environment tool Body includes thermal conductivity factor, density, modulus of elasticity, cable laying depth, air themperature, the soil moisture, cable spacing arrangement.
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| CN201510413551.5A CN105205202B (en) | 2015-07-14 | 2015-07-14 | A kind of carrying current calculation method |
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| CN105205202B true CN105205202B (en) | 2017-12-12 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106294963A (en) * | 2016-08-04 | 2017-01-04 | 国网上海市电力公司 | Direct-buried cable carrying current calculation method |
| CN106326572A (en) * | 2016-08-26 | 2017-01-11 | 国网四川省电力公司电力科学研究院 | Calculation method of real-time current-carrying capacity of cable connector |
| CN113128080A (en) * | 2019-12-31 | 2021-07-16 | 安波福电气系统有限公司 | Method and apparatus for predicting temperature of wire harness |
| CN113177182B (en) * | 2021-04-29 | 2023-06-27 | 中国电力工程顾问集团中南电力设计院有限公司 | GIL current-carrying capacity calculation method in tunnel |
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