CN113158504B - Method and system for enhancing insulation of connector of extra-high voltage direct current cable - Google Patents
Method and system for enhancing insulation of connector of extra-high voltage direct current cable Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 172
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 13
- 239000011810 insulating material Substances 0.000 claims abstract description 73
- 230000005684 electric field Effects 0.000 claims abstract description 67
- 238000012360 testing method Methods 0.000 claims abstract description 50
- 238000004364 calculation method Methods 0.000 claims abstract description 42
- 238000004088 simulation Methods 0.000 claims abstract description 34
- 238000012512 characterization method Methods 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 239000004020 conductor Substances 0.000 claims description 29
- 230000008878 coupling Effects 0.000 claims description 21
- 238000010168 coupling process Methods 0.000 claims description 21
- 238000005859 coupling reaction Methods 0.000 claims description 21
- 230000008859 change Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 18
- 230000003014 reinforcing effect Effects 0.000 claims description 18
- 239000012774 insulation material Substances 0.000 claims description 17
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims description 15
- 230000004913 activation Effects 0.000 claims description 13
- 230000005672 electromagnetic field Effects 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 13
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- 238000005457 optimization Methods 0.000 claims description 11
- 230000015556 catabolic process Effects 0.000 claims description 10
- 230000001965 increasing effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000005485 electric heating Methods 0.000 claims 2
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- 238000013461 design Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 229920003020 cross-linked polyethylene Polymers 0.000 description 6
- 239000004703 cross-linked polyethylene Substances 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
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- 230000017525 heat dissipation Effects 0.000 description 2
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- 229920000642 polymer Polymers 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 1
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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
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/16—Cables, cable trees or wire harnesses
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- G—PHYSICS
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Abstract
The invention discloses a method and a system for enhancing insulation of a connector of an extra-high voltage direct current cable, and belongs to the technical field of power cable equipment. The method of the invention comprises the following steps: acquiring test data, conducting conductivity fitting on the test data, and determining characterization parameters; determining the length of an insulation interface and an enhanced insulation interface of the extra-high voltage direct current cable connector and the thickness of the connector enhanced insulation; according to the characterization parameters, optimizing data of the insulation and reinforced insulation interface length and the joint reinforced insulation thickness are obtained through simulation calculation; and obtaining the conductivity fitting parameters of the modified reinforced insulating material. The invention solves the problem of optimizing the electric field and thermal field distribution in the extra-high voltage direct current cable joint, effectively controls the joint length, the outer diameter and the thickness, ensures that the extra-high voltage direct current cable joint meets the performance requirements of the electric field and the thermal field, and greatly facilitates the processing, manufacturing and mounting processes of the extra-high voltage direct current cable joint.
Description
Technical Field
The invention relates to the technical field of power cable equipment, in particular to a method and a system for enhancing insulation of a joint of an extra-high voltage direct current cable.
Background
Under the direct current field, the electric charge conduction in the polymer insulating medium is limited by the electric charge injected by the electrode, the phenomena of electron transition on a local energy band, electrode electron emission current, space charge limiting current and the like exist, the electric conductivity of the polymer insulating medium shows a nonlinear volt-ampere relationship depending on the temperature and the electric field intensity, and the electric field distribution of the nonlinear conductive polymer insulating material under the effect of the direct current field in the insulating layer can be reversed under different conveying loads of the cable.
Because the electric conductivity orders of the two insulating materials in the direct current cable intermediate joint are far different, the electric field intensity difference at two sides of the double-layer insulating interface of the joint is larger, the electric field intensity ratio is gradually increased along with the increase of the load current of the direct current cable, space charges can be accumulated on the interface of the main insulation of the direct current cable and the reinforced insulation of the joint, and the tangential electric field at the interface is distorted. The enhanced insulation of the direct current cable connector has a decisive influence on the electric field distribution in the cable connector, and an effective way to reduce the degree of electric field distortion in the connector is to increase the length and thickness of the enhanced insulation material in the connector, which has a direct influence on the heat dissipation, processing, manufacturing and installation of the connector parts.
Therefore, the selection of structural parameters for enhancing insulation in the intermediate connector of the extra-high voltage direct current cable becomes a key problem, and a design method for enhancing insulation of the connector, which can realize the coordination of electric fields and thermal fields of the connector, is needed, the geometric dimension of the connector of the extra-high voltage direct current cable is controlled, the electric field intensity and the temperature field distribution in the connector of the extra-high voltage direct current cable are optimized, the distortion degree of the electric field is reduced, the heat dissipation of the connector is facilitated, and the processing, the manufacturing and the installation are facilitated.
Disclosure of Invention
In view of the above problems, the present invention provides a method for enhancing insulation of a connector of an extra-high voltage dc cable, comprising:
Conducting conductivity tests on the insulating material and the original reinforced insulating material of the characteristic high-voltage direct-current cable connector at different temperatures and different field strengths to obtain test data, conducting conductivity fitting on the test data, and determining characterization parameters;
Aiming at the extra-high voltage direct current cable connector, carrying out simulation calculation on an electric-thermal coupling physical field of an extra-high voltage direct current cable connector model under a preset condition, and determining the insulation and reinforced insulation interface length and the connector reinforced insulation thickness of the extra-high voltage direct current cable connector;
According to the characterization parameters, optimizing data of the insulation and reinforced insulation interface length and the joint reinforced insulation thickness are obtained through simulation calculation;
modifying the extra-high voltage direct current cable joint reinforced insulating material, conducting conductivity test data of different modified reinforced insulating materials, conducting conductivity fitting on the test data, and obtaining conductivity fitting parameters of the modified reinforced insulating materials;
The fitting parameters of the conductivity of the modified reinforced insulating material are used for determining the type of the reinforced insulating material in the connector of the extra-high voltage direct current cable;
And installing an insulation structure according to the type of the reinforced insulation material in the connector and the size information, wherein the insulation structure is used for reinforcing the connector insulation performance of the extra-high voltage direct current cable.
Alternatively, the conductivity fit to the test data uses the following formula:
Wherein sigma is conductivity, T is test temperature, E is test electric field and E >0, A is material constant, B is field intensity coefficient, For activation energy, q is the electron charge amount, and k b is the Boltzmann constant;
the characterization parameters include: material constant A, field strength coefficient B, and activation energy parameter
Optionally, the building of the extra-high voltage direct current cable joint model comprises the following steps:
And determining the profile curves of the stress cone and the high-voltage shielding tube in the extra-high voltage direct current cable joint, obtaining parameters of the outer diameter and thickness of the insulating material of the matched extra-high voltage direct current cable joint and the insulating layer, the outer shielding layer, the buffer layer, the metal sheath and the outer sheath of the reinforced insulating material, establishing an axial section two-dimensional graph of the extra-high voltage direct current cable joint according to the parameters, and establishing an extra-high voltage direct current cable joint model according to the axial section two-dimensional graph.
Optionally, performing an electrothermal coupling physical field simulation calculation, including:
Each component unit in the extra-high voltage direct current cable connector model is provided with parameters of conductivity, relative dielectric constant, density, specific heat capacity and heat conductivity coefficient, and under the conditions of rated voltage U, rated current I and preset temperature, coupling simulation calculation is carried out according to an electromagnetic field physical equation and a solid heat transfer physical equation:
The electromagnetic field physical equation is as follows:
Wherein J is the full current density, Q j,V is the total charge quantity, sigma is the conductivity, E is the electric field strength, and J e is the displacement current density;
the solid heat transfer physical equation is as follows:
Wherein t is a preset temperature, k is a heat conductivity coefficient, q=j·e is a cable internal heat source, and Q out is a cable external heat source.
Optionally, obtaining insulation and enhancing insulation interface length includes:
determining the initial length L of the insulation and enhanced insulation interface according to the following formula;
The method comprises the steps of taking a preset distance as an interval, increasing the initial length of a joint insulation and reinforced insulation interface, determining electric field distribution in an extra-high voltage direct current cable joint model with different interface lengths under the condition of empty load and full load, if the change rate delta E% of a tangential electric field of the joint interface under the condition of empty load and full load is more than or equal to 1%, continuing to increase the interface length until delta E% is less than 1%, and taking the length of the last calculation as the interface length of the extra-high voltage direct current cable joint;
Δe% is the rate of change of the tangential electric field at the interface of the joint, and E T is the critical breakdown field strength at the interface.
Optionally, obtaining the joint enhanced insulation thickness includes:
the initial thickness of the joint reinforcing insulation is determined according to the following formula:
The method comprises the steps of taking a preset distance as an interval, reducing the initial thickness of joint reinforced insulation, determining the steady-state temperature of a cable conductor in an extra-high voltage direct current cable joint model under a full load condition, if the steady-state temperature of the cable conductor under the full load condition is greater than T max, continuing to reduce the thickness of the joint reinforced insulation until the highest steady-state temperature of the conductor is less than and is close to T max, and taking the thickness value calculated last time as the thickness of the extra-high voltage direct current cable joint reinforced insulation;
T max is the maximum allowable continuous working temperature of the insulation material of the extra-high voltage direct current cable.
The invention also provides a system for enhancing insulation of the connector of the extra-high voltage direct current cable, which comprises:
The initial module is used for conducting conductivity tests on the insulating material and the original reinforced insulating material of the characteristic high-voltage direct-current cable connector at different temperatures and different field strengths to obtain test data, conducting conductivity fitting on the test data and determining characterization parameters;
The structure optimization calculation module is used for carrying out electric-thermal coupling physical field simulation calculation on the extra-high voltage direct current cable joint model under the preset condition aiming at the extra-high voltage direct current cable joint, and determining the insulation and reinforced insulation interface length and the joint reinforced insulation thickness of the extra-high voltage direct current cable joint;
the material optimization module is used for obtaining optimization data of the insulation and reinforced insulation interface length and the joint reinforced insulation thickness through simulation calculation according to the characterization parameters;
modifying the extra-high voltage direct current cable joint reinforced insulating material, conducting conductivity test data of different modified reinforced insulating materials, conducting conductivity fitting on the test data, and obtaining conductivity fitting parameters of the modified reinforced insulating materials;
The fitting parameters of the conductivity of the modified reinforced insulating material are used for determining the type of the reinforced insulating material in the connector of the extra-high voltage direct current cable;
And installing an insulation structure according to the type of the reinforced insulation material in the connector and the size information, wherein the insulation structure is used for reinforcing the connector insulation performance of the extra-high voltage direct current cable.
Alternatively, the conductivity fit to the test data uses the following formula:
Wherein sigma is conductivity, T is test temperature, E is test electric field and E >0, A is material constant, B is field intensity coefficient, For activation energy, q is the electron charge amount, and k b is the Boltzmann constant;
the characterization parameters include: material constant A, field strength coefficient B, and activation energy parameter
Optionally, the building of the extra-high voltage direct current cable joint model comprises the following steps:
And determining the profile curves of the stress cone and the high-voltage shielding tube in the extra-high voltage direct current cable joint, obtaining parameters of the outer diameter and thickness of the insulating material of the matched extra-high voltage direct current cable joint and the insulating layer, the outer shielding layer, the buffer layer, the metal sheath and the outer sheath of the reinforced insulating material, establishing an axial section two-dimensional graph of the extra-high voltage direct current cable joint according to the parameters, and establishing an extra-high voltage direct current cable joint model according to the axial section two-dimensional graph.
Optionally, performing an electrothermal coupling physical field simulation calculation, including:
Each component unit in the extra-high voltage direct current cable connector model is provided with parameters of conductivity, relative dielectric constant, density, specific heat capacity and heat conductivity coefficient, and under the conditions of rated voltage U, rated current I and preset temperature, coupling simulation calculation is carried out according to an electromagnetic field physical equation and a solid heat transfer physical equation:
The electromagnetic field physical equation is as follows:
Wherein J is the full current density, Q j,V is the total charge quantity, sigma is the conductivity, E is the electric field strength, and J e is the displacement current density;
the solid heat transfer physical equation is as follows:
Wherein t is a preset temperature, k is a heat conductivity coefficient, q=j·e is a cable internal heat source, and Q out is a cable external heat source.
Optionally, obtaining insulation and enhancing insulation interface length includes:
determining the initial length L of the insulation and enhanced insulation interface according to the following formula;
The method comprises the steps of taking a preset distance as an interval, increasing the initial length of a joint insulation and reinforced insulation interface, determining electric field distribution in an extra-high voltage direct current cable joint model with different interface lengths under the condition of empty load and full load, if the change rate delta E% of a tangential electric field of the joint interface under the condition of empty load and full load is more than or equal to 1%, continuing to increase the interface length until delta E% is less than 1%, and taking the length of the last calculation as the interface length of the extra-high voltage direct current cable joint;
Δe% is the rate of change of the tangential electric field at the interface of the joint, and E T is the critical breakdown field strength at the interface.
Optionally, obtaining the joint enhanced insulation thickness includes:
the initial thickness of the joint reinforcing insulation is determined according to the following formula:
The method comprises the steps of taking a preset distance as an interval, reducing the initial thickness of joint reinforced insulation, determining the steady-state temperature of a cable conductor in an extra-high voltage direct current cable joint model under a full load condition, if the steady-state temperature of the cable conductor under the full load condition is greater than T max, continuing to reduce the thickness of the joint reinforced insulation until the highest steady-state temperature of the conductor is less than and is close to T max, and taking the thickness value calculated last time as the thickness of the extra-high voltage direct current cable joint reinforced insulation;
T max is the maximum allowable continuous working temperature of the insulation material of the extra-high voltage direct current cable.
According to the invention, through relatively accurate data fitting of the relation between the conductivity of the insulating material and the temperature and the electric field, the joint interface length, the enhanced insulation thickness and the enhanced insulating material parameters meeting the design requirements of the extra-high voltage direct current cable joint are successively optimized and determined, the optimization problem of electric field and thermal field distribution in the extra-high voltage direct current cable joint is solved, the joint length and the outer diameter (thickness) are effectively controlled, the extra-high voltage direct current cable joint meets the performance requirements of the electric field and the thermal field, and the processing, manufacturing and mounting processes of the extra-high voltage direct current cable joint are greatly facilitated.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a graph of simulation calculation results of the interface length of the extra-high voltage DC cable connector in the embodiment of the method of the invention;
FIG. 3 is a graph of simulation calculation results of the thickness of the reinforced insulation of the extra-high voltage direct current cable in the embodiment of the method of the invention;
Fig. 4 is a graph of simulation calculation results of the type of the extra-high voltage direct current cable reinforced insulation material in the embodiment of the method of the invention;
fig. 5 is a block diagram of the system of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for enhancing insulation of a connector of an extra-high voltage direct current cable, which is shown in fig. 1 and comprises the following steps:
Conducting conductivity tests on the insulating material and the original reinforced insulating material of the characteristic high-voltage direct-current cable connector at different temperatures and different field strengths to obtain test data, conducting conductivity fitting on the test data, and determining characterization parameters;
Aiming at the extra-high voltage direct current cable connector, carrying out simulation calculation on an electric-thermal coupling physical field of an extra-high voltage direct current cable connector model under a preset condition, and determining the insulation and reinforced insulation interface length and the connector reinforced insulation thickness of the extra-high voltage direct current cable connector;
According to the characterization parameters, optimizing data of the insulation and reinforced insulation interface length and the joint reinforced insulation thickness are obtained through simulation calculation;
modifying the extra-high voltage direct current cable joint reinforced insulating material, conducting conductivity test data of different modified reinforced insulating materials, conducting conductivity fitting on the test data, and obtaining conductivity fitting parameters of the modified reinforced insulating materials;
The fitting parameters of the conductivity of the modified reinforced insulating material are used for determining the type of the reinforced insulating material in the connector of the extra-high voltage direct current cable;
And installing an insulation structure according to the type of the reinforced insulation material in the connector and the size information, wherein the insulation structure is used for reinforcing the connector insulation performance of the extra-high voltage direct current cable.
Wherein, the conductivity fitting of the test data uses the following formula:
Wherein sigma is conductivity, T is test temperature, E is test electric field and E >0, A is material constant, B is field intensity coefficient, For activation energy, q is the electron charge amount, and k b is the Boltzmann constant;
the characterization parameters include: material constant A, field strength coefficient B, and activation energy parameter
The method for establishing the extra-high voltage direct current cable joint model comprises the following steps:
And determining the profile curves of the stress cone and the high-voltage shielding tube in the extra-high voltage direct current cable joint, obtaining parameters of the outer diameter and thickness of the insulating material of the matched extra-high voltage direct current cable joint and the insulating layer, the outer shielding layer, the buffer layer, the metal sheath and the outer sheath of the reinforced insulating material, establishing an axial section two-dimensional graph of the extra-high voltage direct current cable joint according to the parameters, and establishing an extra-high voltage direct current cable joint model according to the axial section two-dimensional graph.
Wherein, carry out the simulation calculation of electric heat coupling physical field, include:
Each component unit in the extra-high voltage direct current cable connector model is provided with parameters of conductivity, relative dielectric constant, density, specific heat capacity and heat conductivity coefficient, and under the conditions of rated voltage U, rated current I and preset temperature, coupling simulation calculation is carried out according to an electromagnetic field physical equation and a solid heat transfer physical equation:
The electromagnetic field physical equation is as follows:
Wherein J is the full current density, Q j,V is the total charge quantity, sigma is the conductivity, E is the electric field strength, and J e is the displacement current density;
the solid heat transfer physical equation is as follows:
Wherein t is a preset temperature, k is a heat conductivity coefficient, q=j·e is a cable internal heat source, and Q out is a cable external heat source.
Wherein, obtain insulation and reinforcing insulation interface length, include:
determining the initial length L of the insulation and enhanced insulation interface according to the following formula;
The method comprises the steps of taking a preset distance as an interval, increasing the initial length of a joint insulation and reinforced insulation interface, determining electric field distribution in an extra-high voltage direct current cable joint model with different interface lengths under the condition of empty load and full load, if the change rate delta E% of a tangential electric field of the joint interface under the condition of empty load and full load is more than or equal to 1%, continuing to increase the interface length until delta E% is less than 1%, and taking the length of the last calculation as the interface length of the extra-high voltage direct current cable joint;
Δe% is the rate of change of the tangential electric field at the interface of the joint, and E T is the critical breakdown field strength at the interface.
Wherein, acquire joint reinforcing insulation thickness, include:
the initial thickness of the joint reinforcing insulation is determined according to the following formula:
The method comprises the steps of taking a preset distance as an interval, reducing the initial thickness of joint reinforced insulation, determining the steady-state temperature of a cable conductor in an extra-high voltage direct current cable joint model under a full load condition, if the steady-state temperature of the cable conductor under the full load condition is greater than T max, continuing to reduce the thickness of the joint reinforced insulation until the highest steady-state temperature of the conductor is less than and is close to T max, and taking the thickness value calculated last time as the thickness of the extra-high voltage direct current cable joint reinforced insulation;
T max is the maximum allowable continuous working temperature of the insulation material of the extra-high voltage direct current cable.
The invention is further illustrated by the following examples:
The invention adopts finite element simulation to calculate the tangential electric field intensity on the joint interface and the electric field intensity in the reinforced insulation, and optimizes the electric field intensity and the temperature field distribution in the joint and controls the geometric dimension of the extra-high voltage direct current cable joint by changing the length of the main insulation and the reinforced insulation interface and the reinforced insulation thickness of the joint and adjusting the conductivity nonlinear parameters of the reinforced insulation material.
According to an alternating current cable connector and a low-voltage-class (less than 800 kV) direct current cable connector design method, determining the profile curves of a stress cone and a high-voltage shielding tube in an extra-high voltage direct current cable connector, establishing an axial section two-dimensional graph of each part unit of the extra-high voltage direct current cable connector, and obtaining the connector XLPE insulation and enhanced insulation interface length L according to the following formula (2):
the thickness Δr of the joint reinforcing insulating layer is obtained by the formula (3):
Wherein sigma 1、σ2 is the conductivity of the cable XLPE insulation and joint reinforced insulation at 25 ℃ and E s electric field, and S/m; u is the potential difference between the cable conductor and the joint reinforcing insulation outer surface, V; r 1 is the radius of the cable conductor, mm; r i is the cable insulation outer radius, mm.
Parameters such as conductivity, relative dielectric constant, density, specific heat capacity, heat conductivity coefficient and the like are given to each component unit in the ultra-high voltage direct current cable joint two-dimensional simulation model, and under the conditions of voltage U, rated current I and initial temperature of 25 ℃, the electromagnetic field physical equation is adopted:
Wherein J is the full current density, A/m2; q j,V is the total charge, C; sigma is conductivity, S/m; e is the electric field strength, V/m; j e is the displacement current density, A/m2.
And the solid heat transfer physical equation:
Wherein T is temperature, K; k is the heat conductivity coefficient, W/(m.k2); q=j·e is the cable internal heat source, W; q out is the cable external heat source, W.
And performing electric-thermal coupling physical field simulation calculation on the extra-high voltage direct current cable connector model by adopting an electric-thermal field direct coupling mode.
And (3) taking 10cm as an interval, increasing the length of an insulating and reinforced insulating interface of the joint XLPE, calculating electric field distribution in an extra-high voltage direct current cable joint model with different interface lengths under the condition of empty load and full load, if the change rate delta E% of the tangential electric field of the joint interface under the condition of empty load and full load is more than or equal to 1%, continuing to increase the interface length until delta E% is less than 1%, and taking the length of the last calculation as the interface length of the extra-high voltage direct current cable joint.
And (3) reducing the thickness of the joint reinforced insulation by taking 1cm as an interval, calculating the steady-state temperature of the cable conductor in the extra-high voltage direct current cable joint model under the full load condition, if the steady-state temperature of the cable conductor under the full load condition is greater than T max, continuously reducing the thickness of the joint reinforced insulation until the highest steady-state temperature of the conductor is less than and is close to T max, and taking the thickness value calculated last time as the thickness of the extra-high voltage direct current cable joint reinforced insulation.
And performing electric field and thermal field coupling simulation calculation on the extra-high voltage direct current cable joint model with the reinforced insulating materials with different conductivity parameters, changing the material constant, the activation energy and the field intensity coefficient parameters of the reinforced insulating materials until the tangential electric field of the joint interface is smaller than the critical breakdown field intensity E T of the interface, the maximum electric field in the reinforced insulation is smaller than E s, the highest temperature of the conductor under the full load condition is smaller than and is close to 70 ℃, and selecting the modified insulating material closest to the conditions as the reinforced insulating material of the extra-high voltage direct current cable joint.
And forming the design result of the reinforced insulation of the extra-high voltage direct current cable connector in terms of structural and material requirements according to the joint interface length, the reinforced insulation thickness and the type of the reinforced insulation determined in the reinforced insulation design process.
The change rate delta E% of the tangential electric field of the joint interface is set to be 1%, the critical breakdown field intensity E T of the interface is set to be 3kV/mm, the maximum allowable continuous working temperature T max of the ultra-high voltage direct current cable insulating material is set to be 70 ℃, and the normal allowable working direct current field intensity E s of the reinforced insulating material at 70 ℃ is set to be 9kV/mm;
According to the structural characteristics of a 500kV alternating current cable joint and 320kV and 500kV direct current cable joints, determining the profile curves of a stress cone and a high-voltage shielding tube in the extra-high voltage direct current cable joint, obtaining the outer diameters and thickness parameters of a crosslinked polyethylene insulating layer, an outer shielding layer, a buffer layer, a metal sheath and an outer sheath of a matched extra-high voltage direct current cable, combining the voltage U of a cable conductor, the critical breakdown field strength E T of an interface, calculating the interface length and the thickness of the reinforced insulation of the extra-high voltage direct current cable joint by the conductivity of XLPE insulation and joint reinforced insulation of the cable when the normal allowable working direct current field strength electric field is E s at 25 ℃, and then establishing the axial section two-dimensional graph of each part unit of the extra-high voltage direct current cable joint;
Simulation calculation for determining the interface length, the enhanced insulation thickness and the enhanced insulation material type of the extra-high voltage direct current cable joint is carried out by using COMSOL finite element simulation software, and simulation calculation results for determining the interface length, the enhanced insulation thickness and the enhanced insulation material type of the extra-high voltage direct current cable joint are respectively shown in figures 2, 3 and 4;
In the process of determining the interface length of the extra-high voltage direct current cable connector, when the interface length is increased to 0.9m from 0.8m, the maximum value of the tangential electric field of the interface is reduced to 4.282kV/mm from 4.323kV/mm when the cable is empty, the electric field change rate is 0.95%, when the cable is full-load, the maximum value of the tangential electric field of the interface is reduced to 4.011kV/mm from 4.023kV/mm, the electric field change rate is 0.3%, the judgment condition of the influence of the interface length change on the intensity of the tangential electric field of the interface is met, and the interface length of the extra-high voltage direct current cable connector is selected to be 0.8m and is used as the basis for the next design of the connector insulation structure.
In the process of determining the enhanced insulation thickness of the extra-high voltage direct current cable connector, under the full load condition, when the enhanced insulation thickness is reduced from 0.19m to 0.18m, the highest temperature of a cable conductor is reduced from 70.36 ℃ to 69.89 ℃, the highest temperature of the cable conductor is smaller than T max, the method meets the judging condition of the influence of the enhanced insulation thickness change on the highest temperature of the cable conductor, and the enhanced insulation thickness of the extra-high voltage direct current cable connector is selected to be 0.18m and is used as the basis of the next design of the connector insulation structure.
In the process of determining the type of the reinforced insulating material of the extra-high voltage direct current cable joint, when the XLPE insulating material of the extra-high voltage direct current cable is matched with the reinforced insulating material D, under the empty load condition, the tangential electric field of the interface of the joint is 2.954kV/mm, which is smaller than the critical breakdown field strength E T of the interface, the maximum electric field in the reinforced insulation is 7.947kV/mm, which is smaller than the normal allowable working direct current field strength E s, the highest temperature of the conductor is smaller than and close to the highest allowable continuous working temperature T max, and the type of the reinforced insulating material D is selected, so that the insulating material D is selected as the reinforced insulating material of the extra-high voltage direct current cable joint.
And forming the design result of the reinforced insulation of the extra-high voltage direct current cable connector in terms of structural and material requirements according to the interface length, the reinforced insulation thickness and the type of the reinforced insulation determined in the reinforced insulation design process.
The present invention provides a system 200 for joint enhanced insulation of extra-high voltage DC cables, as shown in FIG. 5, comprising:
the initial module 201 performs conductivity tests on the insulation material and the original reinforced insulation material of the characteristic high-voltage direct-current cable connector at different temperatures and different field strengths to obtain test data, performs conductivity fitting on the test data, and determines characterization parameters;
The structure optimization calculation module 202 performs electric-thermal coupling physical field simulation calculation on the extra-high voltage direct current cable joint model under the preset condition aiming at the extra-high voltage direct current cable joint, and determines the insulation and reinforced insulation interface length and the joint reinforced insulation thickness of the extra-high voltage direct current cable joint;
The material optimization module 203 acquires optimization data of the insulation and reinforced insulation interface length and the joint reinforced insulation thickness through simulation calculation according to the characterization parameters;
modifying the extra-high voltage direct current cable joint reinforced insulating material, conducting conductivity test data of different modified reinforced insulating materials, conducting conductivity fitting on the test data, and obtaining conductivity fitting parameters of the modified reinforced insulating materials;
The fitting parameters of the conductivity of the modified reinforced insulating material are used for determining the type of the reinforced insulating material in the connector of the extra-high voltage direct current cable;
And installing an insulation structure according to the type of the reinforced insulation material in the connector and the size information, wherein the insulation structure is used for reinforcing the connector insulation performance of the extra-high voltage direct current cable.
Wherein, the conductivity fitting of the test data uses the following formula:
Wherein sigma is conductivity, T is test temperature, E is test electric field and E >0, A is material constant, B is field intensity coefficient, For activation energy, q is the electron charge amount, and k b is the Boltzmann constant;
the characterization parameters include: material constant A, field strength coefficient B, and activation energy parameter
The method for establishing the extra-high voltage direct current cable joint model comprises the following steps:
And determining the profile curves of the stress cone and the high-voltage shielding tube in the extra-high voltage direct current cable joint, obtaining parameters of the outer diameter and thickness of the insulating material of the matched extra-high voltage direct current cable joint and the insulating layer, the outer shielding layer, the buffer layer, the metal sheath and the outer sheath of the reinforced insulating material, establishing an axial section two-dimensional graph of the extra-high voltage direct current cable joint according to the parameters, and establishing an extra-high voltage direct current cable joint model according to the axial section two-dimensional graph.
Wherein, carry out the simulation calculation of electric heat coupling physical field, include:
Each component unit in the extra-high voltage direct current cable connector model is provided with parameters of conductivity, relative dielectric constant, density, specific heat capacity and heat conductivity coefficient, and under the conditions of rated voltage U, rated current I and preset temperature, coupling simulation calculation is carried out according to an electromagnetic field physical equation and a solid heat transfer physical equation:
The electromagnetic field physical equation is as follows:
Wherein J is the full current density, Q j,V is the total charge quantity, sigma is the conductivity, E is the electric field strength, and J e is the displacement current density;
the solid heat transfer physical equation is as follows:
Wherein t is a preset temperature, k is a heat conductivity coefficient, q=j·e is a cable internal heat source, and Q out is a cable external heat source.
Wherein, obtain insulation and reinforcing insulation interface length, include:
determining the initial length L of the insulation and enhanced insulation interface according to the following formula;
The method comprises the steps of taking a preset distance as an interval, increasing the initial length of a joint insulation and reinforced insulation interface, determining electric field distribution in an extra-high voltage direct current cable joint model with different interface lengths under the condition of empty load and full load, if the change rate delta E% of a tangential electric field of the joint interface under the condition of empty load and full load is more than or equal to 1%, continuing to increase the interface length until delta E% is less than 1%, and taking the length of the last calculation as the interface length of the extra-high voltage direct current cable joint;
Δe% is the rate of change of the tangential electric field at the interface of the joint, and E T is the critical breakdown field strength at the interface.
Wherein, acquire joint reinforcing insulation thickness, include:
the initial thickness of the joint reinforcing insulation is determined according to the following formula:
The method comprises the steps of taking a preset distance as an interval, reducing the initial thickness of joint reinforced insulation, determining the steady-state temperature of a cable conductor in an extra-high voltage direct current cable joint model under a full load condition, if the steady-state temperature of the cable conductor under the full load condition is greater than T max, continuing to reduce the thickness of the joint reinforced insulation until the highest steady-state temperature of the conductor is less than and is close to T max, and taking the thickness value calculated last time as the thickness of the extra-high voltage direct current cable joint reinforced insulation;
T max is the maximum allowable continuous working temperature of the insulation material of the extra-high voltage direct current cable.
According to the invention, through relatively accurate data fitting of the relation between the conductivity of the insulating material and the temperature and the electric field, the joint interface length, the enhanced insulation thickness and the enhanced insulating material parameters meeting the design requirements of the extra-high voltage direct current cable joint are successively optimized and determined, the optimization problem of electric field and thermal field distribution in the extra-high voltage direct current cable joint is solved, the joint length and the outer diameter (thickness) are effectively controlled, the extra-high voltage direct current cable joint meets the performance requirements of the electric field and the thermal field, and the processing, manufacturing and mounting processes of the extra-high voltage direct current cable joint are greatly facilitated.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following appended claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A method for joint enhanced insulation of an extra-high voltage direct current cable, the method comprising:
Conducting conductivity tests on the insulating material and the original reinforced insulating material of the characteristic high-voltage direct-current cable connector at different temperatures and different field strengths to obtain test data, conducting conductivity fitting on the test data, and determining characterization parameters;
Aiming at the extra-high voltage direct current cable connector, carrying out simulation calculation on an electric-thermal coupling physical field of an extra-high voltage direct current cable connector model under a preset condition, and determining the insulation and reinforced insulation interface length and the connector reinforced insulation thickness of the extra-high voltage direct current cable connector;
according to the characterization parameters, optimizing data of the insulation and reinforced insulation interface length and the joint reinforced insulation thickness are obtained through simulation calculation;
Modifying the extra-high voltage direct current cable joint reinforced insulating material, conducting conductivity test data of different modified reinforced insulating materials, conducting conductivity fitting on the test data, and obtaining conductivity fitting parameters of the modified reinforced insulating materials;
The fitting parameters of the conductivity of the modified reinforced insulating material are used for determining the type of the reinforced insulating material in the connector of the extra-high voltage direct current cable;
According to the type of the reinforced insulating material in the connector, an insulating structure is installed according to the size information, and the insulating structure is used for reinforcing the connector insulating performance of the extra-high voltage direct current cable;
The performing the simulation calculation of the electric heating coupling physical field comprises the following steps:
Each component unit in the extra-high voltage direct current cable connector model is provided with parameters of conductivity, relative dielectric constant, density, specific heat capacity and heat conductivity coefficient, and under the conditions of rated voltage U, rated current I and preset temperature, coupling simulation calculation is carried out according to an electromagnetic field physical equation and a solid heat transfer physical equation:
The electromagnetic field physical equation is as follows:
Wherein J is the full current density, Q j,v is the total charge quantity, sigma is the conductivity, E is the electric field strength, and J e is the displacement current density;
the solid heat transfer physical equation is as follows:
Wherein t is a preset temperature, k is a heat conductivity coefficient, q=j·e is a cable internal heat source, and Q out is a cable external heat source;
The obtaining insulation and enhancing insulation interface length includes:
determining the initial length L of the insulation and enhanced insulation interface according to the following formula;
The method comprises the steps of taking a preset distance as an interval, increasing the initial length of a joint insulation and reinforced insulation interface, determining electric field distribution in an extra-high voltage direct current cable joint model with different interface lengths under the condition of empty load and full load, if the change rate delta E% of a tangential electric field of the joint interface under the condition of empty load and full load is more than or equal to 1%, continuing to increase the interface length until delta E% is less than 1%, and taking the length of the last calculation as the interface length of the extra-high voltage direct current cable joint;
Δe% is the rate of change of the tangential electric field at the interface of the joint, and E T is the critical breakdown field strength at the interface.
2. The method of claim 1, said conductivity fitting of test data using the formula:
Wherein sigma is conductivity, T is test temperature, E is test electric field and E >0, A is material constant, B is field intensity coefficient, For activation energy, q is the electron charge amount, and k b is the Boltzmann constant;
the characterization parameters include: material constant A, field strength coefficient B, and activation energy parameter
3. The method of claim 1, wherein the establishing of the extra-high voltage direct current cable joint model comprises:
And determining the profile curves of the stress cone and the high-voltage shielding tube in the extra-high voltage direct current cable joint, obtaining parameters of the outer diameter and thickness of the insulating material of the matched extra-high voltage direct current cable joint and the insulating layer, the outer shielding layer, the buffer layer, the metal sheath and the outer sheath of the reinforced insulating material, establishing an axial section two-dimensional graph of the extra-high voltage direct current cable joint according to the parameters, and establishing an extra-high voltage direct current cable joint model according to the axial section two-dimensional graph.
4. The method of claim 1, the obtaining joint enhanced insulation thickness comprising:
the initial thickness of the joint reinforcing insulation is determined according to the following formula:
The method comprises the steps of taking a preset distance as an interval, reducing the initial thickness of joint reinforced insulation, determining the steady-state temperature of a cable conductor in an extra-high voltage direct current cable joint model under a full load condition, if the steady-state temperature of the cable conductor under the full load condition is greater than T max, continuing to reduce the thickness of the joint reinforced insulation until the highest steady-state temperature of the conductor is less than and is close to T max, and taking the thickness value calculated last time as the thickness of the extra-high voltage direct current cable joint reinforced insulation;
T max is the maximum allowable continuous working temperature of the insulation material of the extra-high voltage direct current cable.
5. A system for joint enhanced insulation of extra-high voltage dc cables, the system comprising:
The initial module is used for conducting conductivity tests on the insulating material and the original reinforced insulating material of the characteristic high-voltage direct-current cable connector at different temperatures and different field strengths to obtain test data, conducting conductivity fitting on the test data and determining characterization parameters;
The structure optimization calculation module is used for carrying out electric-thermal coupling physical field simulation calculation on the extra-high voltage direct current cable joint model under the preset condition aiming at the extra-high voltage direct current cable joint, and determining the insulation and reinforced insulation interface length and the joint reinforced insulation thickness of the extra-high voltage direct current cable joint;
the material optimization module is used for obtaining optimization data of the insulation and reinforced insulation interface length and the joint reinforced insulation thickness through simulation calculation according to the characterization parameters;
Modifying the extra-high voltage direct current cable joint reinforced insulating material, conducting conductivity test data of different modified reinforced insulating materials, conducting conductivity fitting on the test data, and obtaining conductivity fitting parameters of the modified reinforced insulating materials;
The fitting parameters of the conductivity of the modified reinforced insulating material are used for determining the type of the reinforced insulating material in the connector of the extra-high voltage direct current cable;
According to the type of the reinforced insulating material in the connector, an insulating structure is installed according to the size information, and the insulating structure is used for reinforcing the connector insulating performance of the extra-high voltage direct current cable;
The performing the simulation calculation of the electric heating coupling physical field comprises the following steps:
Each component unit in the extra-high voltage direct current cable connector model is provided with parameters of conductivity, relative dielectric constant, density, specific heat capacity and heat conductivity coefficient, and under the conditions of rated voltage U, rated current I and preset temperature, coupling simulation calculation is carried out according to an electromagnetic field physical equation and a solid heat transfer physical equation:
The electromagnetic field physical equation is as follows:
Wherein J is the full current density, Q j,V is the total charge quantity, sigma is the conductivity, E is the electric field strength, and J e is the displacement current density;
the solid heat transfer physical equation is as follows:
Wherein t is a preset temperature, k is a heat conductivity coefficient, q=j·e is a cable internal heat source, and Q out is a cable external heat source;
The obtaining insulation and enhancing insulation interface length includes:
determining the initial length L of the insulation and enhanced insulation interface according to the following formula;
The method comprises the steps of taking a preset distance as an interval, increasing the initial length of a joint insulation and reinforced insulation interface, determining electric field distribution in an extra-high voltage direct current cable joint model with different interface lengths under the condition of empty load and full load, if the change rate delta E% of a tangential electric field of the joint interface under the condition of empty load and full load is more than or equal to 1%, continuing to increase the interface length until delta E% is less than 1%, and taking the length of the last calculation as the interface length of the extra-high voltage direct current cable joint;
Δe% is the rate of change of the tangential electric field at the interface of the joint, and E T is the critical breakdown field strength at the interface.
6. The system of claim 5, the conductivity fitting of the test data using the formula:
Wherein sigma is conductivity, T is test temperature, E is test electric field and E >0, A is material constant, B is field intensity coefficient, For activation energy, q is the electron charge amount, and k b is the Boltzmann constant;
the characterization parameters include: material constant A, field strength coefficient B, and activation energy parameter
7. The system of claim 5, the building of the uhv dc cable joint model comprising:
And determining the profile curves of the stress cone and the high-voltage shielding tube in the extra-high voltage direct current cable joint, obtaining parameters of the outer diameter and thickness of the insulating material of the matched extra-high voltage direct current cable joint and the insulating layer, the outer shielding layer, the buffer layer, the metal sheath and the outer sheath of the reinforced insulating material, establishing an axial section two-dimensional graph of the extra-high voltage direct current cable joint according to the parameters, and establishing an extra-high voltage direct current cable joint model according to the axial section two-dimensional graph.
8. The system of claim 5, the obtaining joint enhanced insulation thickness comprising:
the initial thickness of the joint reinforcing insulation is determined according to the following formula:
The method comprises the steps of taking a preset distance as an interval, reducing the initial thickness of joint reinforced insulation, determining the steady-state temperature of a cable conductor in an extra-high voltage direct current cable joint model under a full load condition, if the steady-state temperature of the cable conductor under the full load condition is greater than T max, continuing to reduce the thickness of the joint reinforced insulation until the highest steady-state temperature of the conductor is less than and is close to T max, and taking the thickness value calculated last time as the thickness of the extra-high voltage direct current cable joint reinforced insulation;
T max is the maximum allowable continuous working temperature of the insulation material of the extra-high voltage direct current cable.
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