CN105205202A - Current carrying capacity calculation method - Google Patents
Current carrying capacity calculation method Download PDFInfo
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- CN105205202A CN105205202A CN201510413551.5A CN201510413551A CN105205202A CN 105205202 A CN105205202 A CN 105205202A CN 201510413551 A CN201510413551 A CN 201510413551A CN 105205202 A CN105205202 A CN 105205202A
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Abstract
Disclosed is a cable current carrying capacity calculation method. A finite element method adopts finite element software as a tool. The method comprises the two main steps of simulating calculation of a cable group temperature field and numerical calculation of the current carrying capacity by using the temperature field as the condition. The method can solve the problems that the calculation process is difficult and complex and obtained data are not accurate when an existing method is adopted for calculating the cable current carrying capacity.
Description
Technical field
The invention belongs to electrical and information engineering field, be specifically related to a kind of current-carrying capacity of cable computing method.
Background technology
The current-carrying capacity of cable is the important parameter determining cable transmission ability, steady state operating current when it refers to that cable core temperature reaches 90 DEG C.Its importance relates to operation and the cable life problem of safe and reliable, the economical rationality of transmission line of electricity.The current-carrying capacity of cable is bigger than normal, and cable core working temperature can be caused to exceed permissible value, and the life-span of insulation will shorten than desired value; Current-carrying capacity is less than normal, then cable core copper material or aluminium just can not be fully utilized, and causes unnecessary waste.The determination of current-carrying capacity is a difficulty and loaded down with trivial details problem, particularly for the occasion of service condition complexity, if any the situation that a large amount of directly buried installations and comb lay.Along with the development in city, the application of these system of layings is more and more extensive, and the dense degree of cable laying is also more and more higher, and the environment of operation also becomes more complicated.Traditional calculating current-carrying capacity method is the analytical Calculation based on IEC60287, and it have ignored the proximity effect between loop, and cable conductor is visualized as isothermal surface, ignores the impact etc. of soil moisture, there is many deficiencies.Therefore a lot of experts and scholars start to be devoted to the process of iteration based on numerical evaluation, although process of iteration can obtain the exact value of current-carrying capacity theoretically, but in actual computation process, iteration all needs to do a finite element simulation each time, if iteration convergence comparatively fast may only need to do finite element simulation several times just can obtain desirable result, otherwise need to do tens of even hundreds of finite element stimulation.
Summary of the invention
Technical matters to be solved by this invention is for above-mentioned the deficiencies in the prior art, and a kind of current-carrying capacity of cable computing method provided, when it can solve and adopt the current-carrying capacity of existing method to cable to calculate, the coarse problem of computation process data that are difficult, loaded down with trivial details and that obtain.
The object of invention is achieved in that
A kind of carrying current calculation method, it comprises the following steps:
One, computation model cell type is defined;
Two, according to cable material and lay Environment Definition material properties;
Three, cable-soil-air aggregation model is set up;
Four, model is carried out folded point of operation and gives characteristic to model making the corresponding corresponding material properties of the different Element of model by Boolean calculation;
Five, FEM meshing;
Six, imposed load and constraint;
Seven, solve and obtain model temperature cloud charts;
Eight, apply many group electric currents and obtain corresponding Temperature Distribution cloud atlas, be i.e. many group conductor temperature values;
Nine, the respective function of conductor temperature and conductor current can be tried to achieve according to above many group current values and many group conductor temperature values;
Ten, according to trying to achieve current value corresponding to conductor temperature 90 DEG C and current-carrying capacity with superior function.
2, carrying current calculation method according to claim 1, is characterized in that: the numerical evaluation of described current-carrying capacity is that curve calculates.
3, carrying current calculation method according to claim 1, is characterized in that: described material properties and lay environment and specifically comprise coefficient of heat conductivity, density, elastic modulus, the cable laying degree of depth, air themperature, the soil moisture, cable pitch arrangement mode.
Adopt above-mentioned computing method, obtain following beneficial effect: computing method eliminate loaded down with trivial details and are difficult to the thermal resistance parameters of accurate Calculation, simultaneously also the alternating current resistance of calculating conductor namely need not can obtain current-carrying capacity at varying environment temperature and temperature parameter, and the current-carrying capacity Comparative result IEC standard calculated is closer to actual value, the safety of transmission line of electricity and economy and its life problems is made to have had good guarantee like this, the transmission capacity of transmission line of electricity is improved to greatest extent under ensureing the prerequisite of safety, control the transmission line of electricity loading current aging accident of minimizing cable of effective operation in the scope that current-carrying capacity allows for a long time, even reduce the fire failure that cable causes.
Embodiment
A kind of carrying current calculation method, it comprises the following steps:
One, computation model cell type is defined;
Two, according to cable material and lay Environment Definition material properties;
Three, cable-soil-air aggregation model is set up;
Four, model is carried out folded point of operation and gives characteristic to model making the corresponding corresponding material properties of the different Element of model by Boolean calculation;
Five, FEM meshing;
Six, imposed load and constraint;
Seven, solve and obtain model temperature cloud charts;
Eight, apply many group electric currents and obtain corresponding Temperature Distribution cloud atlas, be i.e. many group conductor temperature values;
Nine, the respective function of conductor temperature and conductor current can be tried to achieve according to above many group current values and many group conductor temperature values;
Ten, according to trying to achieve current value corresponding to conductor temperature 90 DEG C and current-carrying capacity with superior function.
The numerical evaluation of described current-carrying capacity is that curve calculates.
Described material properties and lay environment and specifically comprise coefficient of heat conductivity, density, elastic modulus, the cable laying degree of depth, air themperature, the soil moisture, cable pitch arrangement mode.
With YJLW02-64/110kv.1 × 300mm
2cable is calculated as example: construction of cable parameter is as subordinate list 1, and cable laying condition is as subordinate list 2, and cable material parameter is as subordinate list 3.
First in Ansys software, define its cell type is plane 6 node two-order unit; According to table 3 material parameter, material properties is set; So two dimensional model is built according to table 2 cable laying condition and table 1 construction of cable parameter; Boolean calculation is carried out folded point of operation and is made the corresponding corresponding material properties of the different material layer of model to model imparting characteristic; To finite element model stress and strain model; Load and the condition that imposes restriction; Calculating solves and obtains cable temperature cloud charts.Repeatedly secondary loading current obtain many group conductor temperature values can the respective function curve of matching conductor temperature and conductor current; Current value corresponding to conductor temperature 90 DEG C and current-carrying capacity is tried to achieve according to function curve.
Table 1 construction of cable parameter
Table 2 cable laying condition
Table 3 cable material property parameters
Claims (3)
1. a carrying current calculation method, is characterized in that, it comprises the following steps:
One, computation model cell type is defined;
Two, according to cable material and lay Environment Definition material properties;
Three, cable-soil-air aggregation model is set up;
Four, model is carried out folded point of operation and gives characteristic to model making the corresponding corresponding material properties of the different Element of model by Boolean calculation;
Five, FEM meshing;
Six, imposed load and constraint;
Seven, solve and obtain model temperature cloud charts;
Eight, apply many group electric currents and obtain corresponding Temperature Distribution cloud atlas, be i.e. many group conductor temperature values;
Nine, the respective function of conductor temperature and conductor current can be tried to achieve according to above many group current values and many group conductor temperature values;
Ten, according to trying to achieve current value corresponding to conductor temperature 90 DEG C and current-carrying capacity with superior function.
2. carrying current calculation method according to claim 1, is characterized in that: the numerical evaluation of described current-carrying capacity is that curve calculates.
3. carrying current calculation method according to claim 1, is characterized in that: described material properties and lay environment and specifically comprise coefficient of heat conductivity, density, elastic modulus, the cable laying degree of depth, air themperature, the soil moisture, cable pitch arrangement mode.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN201510413551.5A CN105205202B (en) | 2015-07-14 | 2015-07-14 | A kind of carrying current calculation method |
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| CN105205202A true CN105205202A (en) | 2015-12-30 |
| CN105205202B CN105205202B (en) | 2017-12-12 |
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Cited By (4)
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| 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 |
| CN113177182A (en) * | 2021-04-29 | 2021-07-27 | 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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Cited By (5)
| 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 |
| CN113177182A (en) * | 2021-04-29 | 2021-07-27 | 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 |
| 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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| CN105205202B (en) | 2017-12-12 |
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