CN106599383A - Time domain response-based inter-double-cable transient state temperature rise acquisition method - Google Patents
Time domain response-based inter-double-cable transient state temperature rise acquisition method Download PDFInfo
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Abstract
The invention relates to a time domain response-based inter-double-cable transient state temperature rise acquisition method. The method comprises the following steps of 1) obtaining an intrinsic coefficient of each cable of the two cables separately, and establishing a double-cable heat dissipation finite element physical model; 2) determining parameters in the finite element physical model to generate an inter-double-cable transient state temperature rise model, and adjusting the parameters after verification; and 3) taking an environment temperature as a temperature reference point, obtaining a cable thermal load in actual operating of the first cable, and calculating inter-double-cable transient state temperature rise according to the inter-double-cable transient state temperature rise model, namely the thermal load of the first cable and the transient state temperature rise of a second cable core wire. Compared with the prior art, the method has the advantages of rapid and convenient calculation, convenient expansion and the like.
Description
Technical field
The present invention relates to power cable running technology field, more particularly, between a kind of two telegram in reply cables based on time domain response
The acquisition methods of transient state temperature rise.
Background technology
Due to the particularity of power cable operation, it is not generally possible to go to obtain power cable core temperature by direct measurement
Degree, the particularly real-time transient-state temperature of core, therefore technical staff propose various methods and go to calculate power cable core temperature,
It is the engineering formula or approximate formula based on numerical solution and result of the test.It is a kind of classical meter such as based on IEC60287 standards
Calculate the computational methods of power cable core temperature, the current-carrying capacity method for solving based on numerical computations.For the electricity in actual motion
Cable adopts numerical methods of solving, it is contemplated that the complexity of operating mode, required amount of calculation are huge, and it is very low to be embodied as middle efficiency, needs
The calculating time is very long, and in practical application, operations staff desirably can know power cable core transient state in real time
Temperature, relative to the time of numerical computations, this real-time is cannot be guaranteed.
Due to the restriction for calculating, therefore adopt is installed the devices such as light thermometric additional to obtain cable skin temperature more in running,
The method for further extrapolating cable core temperature, its principle are as shown in Figure 1.Also certain effect has been played in actual motion.
Wherein, I1For cable loss hot-fluid, U1For core temperature, U0For skin temperature, R1For " core-epidermis " thermal resistance, C1
For " core-epidermis " thermal capacitance.
But there are some defects in such method：1) essential such method only realizes the survey to unit cable temperature rise process
Amount and estimation, it is impossible to isolate influencing each other between cable, therefore the transient state under many times cable load change conditions cannot be realized
Temperature rise process is estimated；2) defects such as the health status of heavy dependence temperature measuring equipment, thermometric deviation, transmission communication will directly restrict electricity
The selection of cable equipment operation.There are some sections in view of a telegram in reply cable needs to be monitored, and is so accomplished by installing many set surveys additional
Warm device, therefore the reliability of total system is extremely low, this is also that current such method cannot direct applied basic original on a large scale
Cause；To improve the global reliability of device/system, need to strengthen Redundancy Design, the methods for covering and filling even, this not only increases more
Device/system is once invested, and brings huge workload to follow-up operation maintenance.
The content of the invention
The purpose of the present invention is exactly to provide one kind and calculate quick, calculating to overcome the defect of above-mentioned prior art presence
The acquisition methods of transient state temperature rise between the two telegram in reply cables based on time domain response that are convenient, being easy to extension.
The purpose of the present invention can be achieved through the following technical solutions：
The acquisition methods of transient state temperature rise between a kind of two telegram in reply cables based on time domain response, to the heat for obtaining the first telegram in reply cable
Transient state temperature rise of the load to the second telegram in reply core, comprises the following steps：
1) often wire back in obtaining two telegram in reply cables respectively the intrinsic coefficient of cable, including cable density, cable specific heat capacity, mediation are led
Hot coefficient and the soil density with single telegram in reply cable related soil, specific heat capacity are held and soil heat exchange coefficient, and according to intrinsic system
Number builds the finite element physical model of two telegram in reply cables radiating；
2) determine the parameter in finite element physical model, generate transient state Temperature Rise Model between two telegram in reply cables, and after being verified
Adjusting parameter；
3) the cable thermal force of the actual motion of the first telegram in reply cable with ambient temperature as temperature reference point, is obtained, according to two
Between telegram in reply cable, transient state Temperature Rise Model calculates the transient state temperature rise between two telegram in reply cables, i.e., the thermal force of the first telegram in reply cable is to the second telegram in reply cable
The transient state temperature rise of heart yearn.
Described step 2) specifically include following steps：
21) the step thermal force of the first telegram in reply cable is given, the first telegram in reply cable thermal force and the is obtained using FEM calculation
The response curve of two loop line core temperature rises；
22) design parameter of transient state Temperature Rise Model between two telegram in reply cables, including the second telegram in reply cable are obtained according to response curve
Comprehensive thermal resistance R of the core to environment1And transition parameter R2、L1And C1。
Described step 32) specifically include following steps：
221) numerical value according to steady-state response in response curve, calculates comprehensive thermal resistance of the second telegram in reply cable core to environment
R1；
222) comprehensive thermal resistance R by the second telegram in reply cable core to environment1Substitute into the finite element physics mould of two telegram in reply cables radiating
In type, and carry out response curve fitting acquisition transition parameter R2、L1And C1Concrete numerical value, in identical given first telegram in reply
Under the conditions of cable step thermal force so as to which response curve of the response with the first telegram in reply cable thermal force with the second loop line core temperature rise is harmonious.
Between two described telegram in reply cables, transient state Temperature Rise Model is：
Wherein, U3For transient state temperature rise between two telegram in reply cables, U1For thermal resistance R2Nominal temperature rise, U2For thermal sensation L1Nominal temperature rise,
I1For cable thermal force, I2To flow through thermal capacitance C1The hot-fluid of branch road, I3To flow through comprehensive thermal resistance R1The hot-fluid of branch road, t are the time.
Described step 222) in, transition parameter R2、L1、C1Obtained by genetic algorithm.
Described step 3) in, cable thermal force I1Calculating formula be：
I1=I2*R
R=R ' (1+Ys+Yp)
R '=R0[1+α(θ-20)]
Wherein, I is cable current, and R is cable AC electric resistance, and R ' is maximum operating temperature lower conductor D.C. resistance, YsFor
Kelvin effect factor, YpFor kindred effect factor, R0For 20 DEG C when conductor DC resistance, the temperature system of copper conductor when α is 20 DEG C
Number, θ is running temperature.
Compared with prior art, the present invention has advantages below：
First, calculate quick：Heat transfer response model between the cable that this method proposes based on time domain response first, overcomes number
The Re Lufa loaded down with trivial details shortcoming of value calculating method poor in timeliness, method of real-time poor reliability, tradition, quickly can realize between cable
Temperature rise response Transient calculation.
2nd, convenience of calculation：The determination of this model does not rely on cable caloric value itself or size of current, only with cable around
The thermal characteristicss of material are related, and the interior class feature of general temperature range of operation is believed that and is basically unchanged, so in conversion cable electricity
Just without the need for repeating the numerical computations such as finite element during stream, satisfied result can be obtained by simple matrix and iteration directly.
3rd, it is easy to extension：The method combines the transient state Temperature Rise Model of single telegram in reply cable, by certain combination, you can realize
The quick realization that many telegram in reply cable temperature rises are calculated.
Description of the drawings
Fig. 1 is existing single power cable lumped parameter thermal circuits.
Fig. 2 is thermal response model between cable.
Fig. 3 is limited element calculation model.
Fig. 4 is result of finite element.
Evolutionary process of the Fig. 5 for parameter extraction genetic algorithm.
Fig. 6 is mutual response model.
Fig. 7 is 2 transient state temperature rise comparison of computational results of cable.
Fig. 8 is CYMCAP computation models.
Fig. 9 is 1 temperature rise process of cable.
Figure 10 is impact of each cable to 1 temperature rise process of cable.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
1st, the principle of this method is as follows：
The heating of many telegram in reply cables depends primarily on the thermal characteristics of cable loss and residing section, the former with running current and
Running temperature has clear and definite corresponding relation, directly can apply；And the latter depends primarily on the thing of the geometric parameter of section, each several part
Reason parameter, it is believed that in temperature range of operation, physical parameter keep it is constant, these for model foundation provide theory according to
According to.
The temperature reference point of the carried model of the present invention is ambient temperature, and model is illustrated in fig. 2 shown below and (is passed to cable 2 with cable 1
As a example by heat).
Wherein, I1 is 1 thermal force of cable, can pass through electric Knowledge Acquirement；R1 is Thermal Synthetic of 2 core of cable to environment
Resistance；L1 and C1, without clear and definite physical significance, is for producing different transient process；R2 is damping, for suppressing L1, C1 element
The overshoot that may cause.
This Model Parameter is divided into two classes, and the first kind is R1, and which has a clear and definite physical significance, and Equations of The Second Kind C1, R2 and L1
Parameter collectively forms transient state Temperature Rise Model without clear and definite physical significance, two classes.After model structure confirms, for each group of parameter
(C1, R1, R2 and L1), it is determined that thermal force can correspond to the transient state temperature rise process of a time domain, from genetic algorithm adjusting parameter
Value, gradually convergence of approximation target, makes the transient process and numerical computations of model or tests the transient process as far as possible for obtaining
Cause.
2nd, the key step of this method includes：
(1) FEM calculation
1) computation model
This method adopts FEM calculation, and other numerical computations or test method are may also be employed in practical application.This example is selected
Limited element calculation model is as shown in Figure 3.
In figure, A1, A2 are the cross-section of cable；Hot-fluid current-carrying capacity is step wave；Boundary condition 1,2,3,4 is set to temperature 30 and takes the photograph
Family name's degree；Soil density is 1500kg/m3, and cable density is 8900kg/m3；Specific heat capacity is held for 855J/ (kg*K), cable specific heat
Hold for 400J/ (kg*K).Multiple structure is usually contained in view of high voltage power cable, and certain structures layer is very thin.Due to electricity
Cable is the axially symmetric structure of a cylinder, and all directions thermal resistance is identical, and the construction of cable of multilamellar can be entered using harmonic average method
Row is equivalent, and conductor in multi-layer cable outer each Rotating fields are equivalent to one layer of equivalent outer jacket, and the heat conductivity that reconciles in upper example is set to
23.3W/m2*K, soil heat exchange coefficient are 1W/m2*K.
2) design condition is arranged
Design condition is：Cable 1：0-100 (* 1000s), 74.96W；Cable 2：It is temporarily non-loaded.
3) result of calculation
Fig. 4 is cable 1,2 temperature rise process result of calculations.
(2) extraction of model parameter
1) comprehensive thermal resistance R1 of 2 core of cable to environment
According to result of finite element, after transient process terminates, 2 heart yearn temperature rise of cable is 0.983K, and cable 1 is warm to be born
Carry as 74.96W, therefore comprehensive thermal resistance R1=0.983/74.96=0.0132 of 2 core of cable to environment.
2)R2、L1、C1
As above-mentioned parameter is without clear and definite physical significance, it is only used for reflecting the transient process of section heat transfer, which is asked for
Using genetic algorithm.
A) arrange parameter scope：Take L1 ∈ (0,500), C1 ∈ (0,500), R2 ∈ (0,1000), binary coding, initially
Population quantity is 200, and maximum genetic algebra is 100, crossover probability 0.75, mutation probability 0.15.
B) fitness function is set：Responded according to the transient-state temperature of Fig. 2 institutes representation model and calculate shown in m (i) and Fig. 4 transient state temperature
The deviation of degree fem (i) two curves is taken as fitness function
C) convergence criterion is set：, less than 10 or genetic algebra more than 100, evolutionary process is as shown in Figure 5 for fitness function.
4) block mold
Block mold is as shown in Figure 6.
(3) checking of model
1) example 1
By above-mentioned model application and design condition (cable 1：0-100 (* 1000s), 74.96W, step load；Cable 2：Temporarily
It is non-loaded), and compared with FEM calculation, as shown in Figure 7.
Response ratio relatively from the point of view of, model described in Fig. 6 preferably can be realized loading in cable 1, cable under 2 idle condition of cable
The simulation of 2 temperature rise processes.It should be noted that 1) although model described in Fig. 6 is not necessarily optimum, which disclosure satisfy that engineering
Be actually needed；2) according to the characteristics of response process, model may be adjusted, but the method for establishing model based on response is to meet reality
Border.
2) example 2
For the feasibility and effectiveness of checking invention institute extracting method, compared with common software CYMCAP using the method
Compared with.
CYMCAP computation models are as shown in Figure 8.
Model parameter method for solving is with flow process as previously mentioned.
Design condition is as shown in table 1：
1 design condition of table
| 0-24h | 24-48h | 48-72h | 72-96h | |
| Cable 1 | 500A | 500A | 500A | 500A |
| Cable 2 | 500A | 1000A | 1000A | 750A |
| Cable 3 | 500A | 500A | 750A | 1000A |
| Cable 4 | 500A | 1000A | 1000A | 500A |
Result of calculation as shown in Figures 9 and 10, from above-mentioned comparison, the effectiveness of this method institute extracting method, may separate out
Impact of the adjacent cable to its temperature rise, so as to ensure that the credible and accuracy of overall temperature rise calculating.
Claims (6)
1. between a kind of two telegram in reply cables based on time domain response transient state temperature rise acquisition methods, to obtain the first telegram in reply cable heat carry
Transient state temperature rise of the lotus to the second telegram in reply core, it is characterised in that comprise the following steps：
1) often wire back in obtaining two telegram in reply cables respectively the intrinsic coefficient of cable, including cable density, cable specific heat capacity, reconcile heat conduction system
Number and the soil density with single telegram in reply cable related soil, specific heat capacity are held and soil heat exchange coefficient, and according to intrinsic coefficient structure
Build the finite element physical model of two telegram in reply cables radiating；
2) determine the parameter in finite element physical model, generate transient state Temperature Rise Model between two telegram in reply cables, and adjust after being verified
Parameter；
3) the cable thermal force of the actual motion of the first telegram in reply cable with ambient temperature as temperature reference point, is obtained, is wired back according to two
Between cable, transient state Temperature Rise Model calculates the transient state temperature rise between two telegram in reply cables, i.e., the thermal force of the first telegram in reply cable is to the second telegram in reply core
Transient state temperature rise.
2. between a kind of two telegram in reply cables based on time domain response according to claim 1 transient state temperature rise acquisition methods, which is special
Levy and be, described step 2) specifically include following steps：
21) the step thermal force of the first telegram in reply cable is given, the first telegram in reply cable thermal force is obtained with second time using FEM calculation
The response curve of core temperature rise；
22) design parameter of transient state Temperature Rise Model between two telegram in reply cables, including the second telegram in reply cable core pair are obtained according to response curve
Comprehensive thermal resistance R of environment1And transition parameter R2、L1And C1。
3. between a kind of two telegram in reply cables based on time domain response according to claim 2 transient state temperature rise acquisition methods, which is special
Levy and be, described step 32) specifically include following steps：
221) numerical value according to steady-state response in response curve, calculates comprehensive thermal resistance R of the second telegram in reply cable core to environment1；
222) comprehensive thermal resistance R by the second telegram in reply cable core to environment1Substitute in the finite element physical model of two telegram in reply cables radiating,
And carry out response curve fitting and obtain transition parameter R2、L1And C1Concrete numerical value, in identical the first given telegram in reply cable step
Under the conditions of thermal force so as to which response curve of the response with the first telegram in reply cable thermal force with the second loop line core temperature rise is harmonious.
4. between a kind of two telegram in reply cables based on time domain response according to claim 2 transient state temperature rise acquisition methods, which is special
Levy and be, transient state Temperature Rise Model is between two described telegram in reply cables：
Wherein, U3For transient state temperature rise between two telegram in reply cables, U1For thermal resistance R2Nominal temperature rise, U2For thermal sensation L1Nominal temperature rise, I1For
Cable thermal force, I2To flow through thermal capacitance C1The hot-fluid of branch road, I3To flow through comprehensive thermal resistance R1The hot-fluid of branch road, t are the time.
5. between a kind of two telegram in reply cables based on time domain response according to claim 3 transient state temperature rise acquisition methods, which is special
Levy and be, described step 222) in, transition parameter R2、L1、C1Obtained by genetic algorithm.
6. between a kind of two telegram in reply cables based on time domain response according to claim 1 transient state temperature rise acquisition methods, which is special
Levy and be, described step 3) in, cable thermal force I1Calculating formula be：
I1=I2*R
R=R ' (1+Ys+Yp)
R '=R0[1+α(θ-20)]
Wherein, I is cable current, and R is cable AC electric resistance, and R ' is maximum operating temperature lower conductor D.C. resistance, YsTo collect skin effect
Answer factor, YpFor kindred effect factor, R0For 20 DEG C when conductor DC resistance, the temperature coefficient of copper conductor when α is 20 DEG C, θ for fortune
Trip temperature.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107908827A (en) * | 2017-10-25 | 2018-04-13 | 国网上海市电力公司 | The acquisition methods of transient state temperature rise between a kind of two telegram in reply cables containing delay switch |
| CN107944079A (en) * | 2017-10-25 | 2018-04-20 | 国网上海市电力公司 | Comb laying threephase cable group's temperature rise fast acquiring method based on transfer matrix |
| CN108564174A (en) * | 2018-03-29 | 2018-09-21 | 国网上海市电力公司 | Using the lightning impulse voltage waveform double exponential fitting system and method for genetic algorithm |
| CN112861408A (en) * | 2021-02-26 | 2021-05-28 | 国网上海市电力公司 | Method for rapidly acquiring transient temperature rise of groove cable group by considering nonlinear convection heat dissipation |
| CN112883615A (en) * | 2021-02-26 | 2021-06-01 | 国网上海市电力公司 | Method for acquiring transient temperature rise between two cables in groove by considering nonlinear convection heat dissipation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672699A (en) * | 2009-09-21 | 2010-03-17 | 华南理工大学 | Electric cable conductor transient-state temperature determining method and determining device |
| CN103793558A (en) * | 2014-01-15 | 2014-05-14 | 西安交通大学 | Finite element method-based cable group wire core transient temperature calculation method |
| CN104198077A (en) * | 2014-08-29 | 2014-12-10 | 华南理工大学 | Method for calculating real-time conductor temperature of three-core cable |
| CN104750995A (en) * | 2015-04-07 | 2015-07-01 | 国家电网公司 | Calculation method of temperature of conductors of multi-loop soil directly buried cables |
| CN106021676A (en) * | 2016-05-13 | 2016-10-12 | 国网上海市电力公司 | Multi-circle cable steady-state temperature rise acquiring method based on transfer matrix |
-
2016
- 2016-11-23 CN CN201611036774.5A patent/CN106599383B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672699A (en) * | 2009-09-21 | 2010-03-17 | 华南理工大学 | Electric cable conductor transient-state temperature determining method and determining device |
| CN103793558A (en) * | 2014-01-15 | 2014-05-14 | 西安交通大学 | Finite element method-based cable group wire core transient temperature calculation method |
| CN104198077A (en) * | 2014-08-29 | 2014-12-10 | 华南理工大学 | Method for calculating real-time conductor temperature of three-core cable |
| CN104750995A (en) * | 2015-04-07 | 2015-07-01 | 国家电网公司 | Calculation method of temperature of conductors of multi-loop soil directly buried cables |
| CN106021676A (en) * | 2016-05-13 | 2016-10-12 | 国网上海市电力公司 | Multi-circle cable steady-state temperature rise acquiring method based on transfer matrix |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107908827A (en) * | 2017-10-25 | 2018-04-13 | 国网上海市电力公司 | The acquisition methods of transient state temperature rise between a kind of two telegram in reply cables containing delay switch |
| CN107944079A (en) * | 2017-10-25 | 2018-04-20 | 国网上海市电力公司 | Comb laying threephase cable group's temperature rise fast acquiring method based on transfer matrix |
| CN107908827B (en) * | 2017-10-25 | 2020-06-05 | 国网上海市电力公司 | Method for acquiring transient temperature rise between two loops of cables with time delay switches |
| CN107944079B (en) * | 2017-10-25 | 2020-12-11 | 国网上海市电力公司 | Method for rapidly acquiring temperature rise of pipe-arranging laying three-phase cable group based on transfer matrix |
| CN108564174A (en) * | 2018-03-29 | 2018-09-21 | 国网上海市电力公司 | Using the lightning impulse voltage waveform double exponential fitting system and method for genetic algorithm |
| CN112861408A (en) * | 2021-02-26 | 2021-05-28 | 国网上海市电力公司 | Method for rapidly acquiring transient temperature rise of groove cable group by considering nonlinear convection heat dissipation |
| CN112883615A (en) * | 2021-02-26 | 2021-06-01 | 国网上海市电力公司 | Method for acquiring transient temperature rise between two cables in groove by considering nonlinear convection heat dissipation |
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