CN112765762A - Modeling method of cable T-shaped quick joint three-dimensional electric field simulation model - Google Patents
Modeling method of cable T-shaped quick joint three-dimensional electric field simulation model Download PDFInfo
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Abstract
The invention relates to the technical field of cable joints, in particular to a modeling method of a three-dimensional electric field simulation model of a T-shaped quick joint of a cable, which comprises the following steps: s1, establishing a three-dimensional simulation model according to the size of a T-shaped quick joint of a cable to be tested, obtaining a characteristic value and an electrical property value of the T-shaped quick joint of the cable to be tested, and substituting the characteristic value and the electrical property value into the three-dimensional structure model to obtain an electric field simulation model of the T-shaped quick joint of the cable to be tested; s2, performing electric field simulation calculation on the T-shaped quick connector of the cable to be tested, and obtaining electric field distribution of the T-shaped quick connector of the cable to be tested by considering electric field boundary conditions of the T-shaped quick connector of the cable to be tested through an electric field control equation so as to obtain a three-dimensional electric field simulation model. The invention can simulate the electric field distribution of the T-shaped quick joint of the cable under the normal operation condition, and the three-dimensional electric field simulation model can more accurately reflect the operation condition of the cable, thereby having important significance for the insulation evaluation of the T-shaped quick joint of the cable.
Description
Technical Field
The invention relates to the technical field of cable connectors, in particular to a modeling method of a three-dimensional electric field simulation model of a T-shaped quick cable connector.
Background
With the increasing demand of national production and life for electric energy, the crosslinked polyethylene power cable is widely used in the power industry, the T-shaped quick connector matched with the crosslinked polyethylene and the power cable is widely applied, and the T-shaped quick connector of the cable can be used for quickly switching the cable in a partial discharge test. However, since the power cable is already formed when the power cable is shipped, when the cable joint is used, the power cable needs to be stripped and cut in site construction, and accessories such as the cable joint are easy to be subjected to insulation breakdown and burnout, which brings adverse effects to power transmission safety. At present, electric field analysis of a cable middle joint has been researched a lot, but electric field analysis of a cable T-shaped quick joint is less, and two-dimensional simulation is not fine enough compared with three-dimensional simulation because the T-shaped quick joint is not a two-dimensional axisymmetric structure.
Chinese patent CN110427637A discloses a simulation method of dc cable space charge distribution considering the influence of temperature and electric field gradient, comprising the following steps: establishing a two-dimensional physical model of the circular section of the direct-current cable; theoretical analysis of space charge injection of the insulating layer of the direct current cable; theoretical analysis of space charge transport and accumulation in the insulating layer; adding a physical field and performing multi-physical field coupling; setting parameters and boundary conditions according to the actual running condition; mesh subdivision is carried out on the model based on a finite element method, and the space charge and electric field distribution result of the insulating layer of the direct current cable under the action of different temperature gradients and electric field gradients are obtained through simulation; but the above scheme does not perform three-dimensional simulation modeling. Chinese patent CN109408901A discloses a modeling method of a three-dimensional simulation model of electric field distribution of a cable joint, wherein the three-dimensional simulation model is established according to the size of a 35kV cable intermediate joint and is contrastively analyzed with a two-dimensional model and a two-dimensional axisymmetric model.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a modeling method of a three-dimensional electric field simulation model of a T-shaped quick joint of a cable, which can simulate the electric field distribution of the T-shaped quick joint of the cable under the normal operation condition, thereby more accurately reflecting the operation condition of the cable.
In order to solve the technical problems, the invention adopts the technical scheme that:
the modeling method of the three-dimensional electric field simulation model of the cable T-shaped quick joint comprises the following steps:
s1, establishing a three-dimensional simulation model according to the size of a T-shaped quick joint of a cable to be tested, obtaining a characteristic value and an electrical property value of the T-shaped quick joint of the cable to be tested, and substituting the characteristic value and the electrical property value into the three-dimensional structure model to obtain an electric field simulation model of the T-shaped quick joint of the cable to be tested;
s2, performing electric field simulation calculation on the T-shaped quick connector of the cable to be tested, and obtaining electric field distribution of the T-shaped quick connector of the cable to be tested by considering electric field boundary conditions of the T-shaped quick connector of the cable to be tested through an electric field control equation so as to obtain a three-dimensional electric field simulation model.
The modeling method of the three-dimensional electric field simulation model of the cable T-shaped quick joint can carry out simulation calculation aiming at various defects generated in the movement process, study the influence of the defects on the electric field distribution of the cable T-shaped quick joint and further obtain the influence of the defects on the actual operation of the cable T-shaped quick joint; the electric field distribution of the T-shaped quick joint of the cable under the normal operation condition can be simulated, the three-dimensional electric field simulation model can more accurately reflect the operation condition of the cable, and the method has important significance for the insulation evaluation of the T-shaped quick joint of the cable.
Preferably, cable T type quick-operation joint includes sinle silk, crosslinked polyethylene main insulation layer, insulating barrier, copper shield layer, stress cone insulating layer, crimping terminal, connects internal shield layer, connects main insulation layer, sleeve pipe and connects external shield, and the sinle silk periphery is located to crosslinked polyethylene main insulation layer, and crosslinked polyethylene main insulation layer periphery and stress cone are located between stress cone insulating layer and the crosslinked polyethylene main insulation layer to stress cone insulating layer periphery and stress cone, and from the inside to the outsides between stress cone insulating layer and the crosslinked polyethylene main insulation layer and be equipped with insulating barrier and copper shield layer, bushing connection is in crimping terminal, and the sleeve pipe periphery is equipped with and connects main insulation layer, connects and is equipped with between main insulation layer and the sleeve pipe and connects the internal shield layer, connects the external shield and locates cable T type quick-operation joint's surface.
Preferably, step S10 is performed according to the following steps:
s11, carrying out geometric modeling on each part of the T-shaped quick joint of the cable according to the size of the T-shaped quick joint of the cable, and establishing a three-dimensional structure model;
s12, setting electrical property values of structural materials of all parts in a three-dimensional structure model of the T-shaped quick joint of the cable, and dividing grids to obtain an electric field analysis model of the T-shaped quick joint of the cable;
s13, according to the specification of the T-shaped quick connector of the cable, setting the voltage of a core conductor in an electric field analysis model of the T-shaped quick connector of the cable, setting boundary conditions of electric field analysis of the T-shaped quick connector of the cable, and constructing the electric field analysis model of the T-shaped quick connector of the cable.
Preferably, in step S12, the electrical property values include electrical conductivity and relative permittivity; when the grids are divided, carrying out refinement analysis processing on the stress cone, the inner shielding layer and the grids at the corners of the three-dimensional structure model of the T-shaped quick joint of the cable.
Preferably, the relative dielectric constants of the wire core, the crosslinked polyethylene main insulating layer, the insulation shielding layer, the copper shielding layer, the crimping terminal, the stress cone insulating layer, the joint inner shielding layer, the joint main insulating layer, the joint outer shielding layer and the sleeve are respectively as follows: 1. 2.35, 30, 1, 50, 2.78, 50, 2.9, 50, 4.
Preferably, the electrical conductivities of the wire core, the crosslinked polyethylene main insulating layer, the insulation shielding layer, the copper shielding layer, the crimping terminal, the stress cone insulating layer, the joint inner shielding layer, the joint main insulating layer, the joint outer shielding layer and the sleeve are respectively as follows: 5.998X 107S/m、1×10-14S/m、1×10-4S/m、5.998×107S/m、5.998×107S/m、1S/m、1×10-15S/m、1S/m、3×10-15S/m、1S/m、1×10-13S/m。
Preferably, in step S13, the boundary conditions are: the insulation shielding layer of the T-shaped quick connector of the cable is grounded with the outer shielding layer of the connector.
Preferably, in step S13, the voltage of the core conductor in the electric field analysis model of the cable T-type quick connector is set to 10 kV.
Preferably, in step S2, the electric field control equation is:
J＝σE+Je
wherein ^ is a vector differential operator; j is the current density vector, A/m3(ii) a Qj is a current source, A/m3(ii) a Sigma is the conductivity, S/m; e is the electric field vector, V/m; v is the potential, V; j. the design is a squareeFor external injection of current density, A/m3。
Preferably, the potential V is a basic parameter, the other parameters being solved on the basis of the basic parameter.
Compared with the prior art, the invention has the beneficial effects that:
the modeling method of the three-dimensional electric field simulation model of the cable T-shaped quick joint can carry out simulation calculation aiming at various defects generated in the movement process, study the influence of the defects on the electric field distribution of the cable T-shaped quick joint and further obtain the influence of the defects on the actual operation of the cable T-shaped quick joint;
the invention can simulate the electric field distribution of the T-shaped quick joint of the cable under the normal operation condition, and the three-dimensional electric field simulation model can more accurately reflect the operation condition of the cable, thereby having important significance for the insulation evaluation of the T-shaped quick joint of the cable.
Drawings
FIG. 1 is a schematic structural view of a T-shaped quick connector for cables;
FIG. 2 is a three-dimensional simulation model diagram of a cable T-shaped quick coupling;
FIG. 3 is a schematic diagram of a three-dimensional simulation model meshing of a cable T-shaped quick coupling;
FIG. 4 is an electric field distribution diagram of a three-dimensional simulation model of a cable T-shaped quick coupling;
FIG. 5 is an electric field distribution diagram of a section of a three-dimensional simulation model of a T-shaped cable quick coupling;
in the drawings: 1-wire core, 2-crosslinked polyethylene main insulating layer, 3-insulating shielding layer, 4-copper shielding layer, 5-stress cone, 6-stress cone insulating layer, 7-crimping terminal, 8-joint inner shielding layer, 9-joint main insulating layer, 10-joint outer shielding layer and 11-sleeve.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Examples
The embodiment of the invention is an embodiment of a modeling method of a three-dimensional electric field simulation model of a cable T-shaped quick joint, and comprises the following steps:
s1, establishing a three-dimensional simulation model according to the size of a T-shaped quick joint of a cable, as shown in figure 2; obtaining a characteristic value and an electrical property value of the T-shaped quick connector of the cable to be tested, and substituting the characteristic value and the electrical property value into the three-dimensional structure model to obtain an electric field simulation model of the T-shaped quick connector of the cable to be tested;
s2, performing electric field simulation calculation on the T-shaped quick connector of the cable to be tested, and obtaining electric field distribution of the T-shaped quick connector of the cable to be tested by considering electric field boundary conditions of the T-shaped quick connector of the cable to be tested through an electric field control equation so as to obtain a three-dimensional electric field simulation model, as shown in figures 4 and 5.
The embodiment is used for simulation calculation of the electric field analysis model of the T-shaped quick joint of the cable to be measured, can carry out simulation calculation aiming at various defects in the motion process, and researches the influence of the defects on the electric field distribution of the T-shaped quick joint of the cable, thereby obtaining the influence of various defects on the actual operation of the T-shaped quick joint of the cable.
The T-shaped quick connector for the cable comprises a wire core 1, a crosslinked polyethylene main insulating layer 2, an insulating shielding layer 3, a copper shielding layer 4, a stress cone 5, a stress cone insulating layer 6, a crimping terminal 7, a connector inner shielding layer 8, a connector main insulating layer 9, a sleeve 11 and a connector outer shielding layer 10, wherein the crosslinked polyethylene main insulating layer 2 is arranged on the periphery of the wire core 1, the stress cone insulating layer 6 is arranged on the periphery of the crosslinked polyethylene main insulating layer 2, the stress cone 5 is arranged between the stress cone insulating layer 6 and the crosslinked polyethylene main insulating layer 2, the insulating shielding layer 3 and the copper shielding layer 4 are overlapped from inside to outside between the stress cone insulating layer 6 and the crosslinked polyethylene main insulating layer 2, the sleeve 11 is connected with the crimping terminal 7, the connector main insulating layer 9 is arranged on the periphery of the sleeve 11, the connector inner shielding layer 8 is arranged between the connector main insulating layer 9 and the sleeve 11, and the connector outer shielding, as shown in fig. 1.
Step S10 is performed as follows:
s11, carrying out geometric modeling on each part of the T-shaped quick joint of the cable according to the size of the T-shaped quick joint of the cable, and establishing a three-dimensional structure model;
s12, setting electrical property values of structural materials of all parts in a three-dimensional structure model of the T-shaped quick joint of the cable, and dividing grids to obtain an electric field analysis model of the T-shaped quick joint of the cable;
s13, according to the specification of the T-shaped quick connector of the cable, setting the voltage of a core conductor in an electric field analysis model of the T-shaped quick connector of the cable, setting boundary conditions of electric field analysis of the T-shaped quick connector of the cable, and constructing the electric field analysis model of the T-shaped quick connector of the cable.
In step S12, the electrical property values include electrical conductivity and relative permittivity; when the grids are divided, the stress cone, the inner shielding layer and the grids at the corners of the three-dimensional structure model of the T-shaped quick connector of the cable are subjected to thinning analysis processing, as shown in fig. 3. Therefore, the potential and electric field distribution of the T-shaped quick joint of the cable to be detected can be obtained, and the electric field concentrated area in the T-shaped quick joint of the cable can be visually seen. The boundary condition of an electric field model of the T-shaped quick connector of the cable to be tested is considered through an electric field control equation, then the network is split, the stress cone and the connector inner shielding layer are refined, the potential and the electric field distribution of the T-shaped quick connector of the cable to be tested are obtained, and the concentrated area of the electric field in the T-shaped quick connector of the cable can be visually seen.
The electric conductivity of sinle silk 1, crosslinked polyethylene main insulating layer 2, insulating barrier layer 3, copper shield layer 4, crimping terminal 7, stress cone 5, stress cone insulating layer 6, joint internal shield layer 8, joint main insulating layer 9, joint external shield layer 10 and sleeve pipe 11 is respectively: 5.998X 107S/m、1×10-14S/m、1×10-4S/m、5.998×107S/m、5.998×107S/m、1S/m、1×10-15S/m、1S/m、3×10-15S/m、1S/m、1×10-13S/m。
In step S13, the boundary conditions are: the insulation shielding layer of the T-shaped quick connector of the cable is grounded with the outer shielding layer of the connector.
In step S13, the voltage of the core conductor in the electric field analysis model of the T-type quick connector for cables is set to 10 kV.
In step S2, the electric field control equation is:
J＝σE+Je
wherein ^ is a vector differential operator; j is the current density vector, A/m3(ii) a Qj is a current source, A/m3(ii) a Sigma is the conductivity, S/m; e is the electric field vector, V/m; v is the potential, V; j. the design is a squareeFor external injection of current density, A/m3。
The potential V is a basic parameter, and other parameters are solved on the basis of the basic parameter.
Through the steps, the electric field distribution of the T-shaped quick joint of the cable under the normal operation condition can be simulated, the three-dimensional electric field simulation model can more accurately reflect the operation condition of the cable, and the method has important significance for the insulation evaluation of the T-shaped quick joint of the cable.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A modeling method of a cable T-shaped quick joint three-dimensional electric field simulation model is characterized by comprising the following steps:
s1, establishing a three-dimensional simulation model according to the size of a T-shaped quick joint of a cable to be tested, obtaining a characteristic value and an electrical property value of the T-shaped quick joint of the cable to be tested, and substituting the characteristic value and the electrical property value into the three-dimensional structure model to obtain an electric field simulation model of the T-shaped quick joint of the cable to be tested;
s2, performing electric field simulation calculation on the T-shaped quick connector of the cable to be tested, and obtaining electric field distribution of the T-shaped quick connector of the cable to be tested by considering electric field boundary conditions of the T-shaped quick connector of the cable to be tested through an electric field control equation so as to obtain a three-dimensional electric field simulation model.
2. The modeling method of the three-dimensional electric field simulation model of the T-shaped quick joint of the cable according to claim 1, wherein the T-shaped quick joint of the cable comprises a wire core (1), a main cross-linked polyethylene insulation layer (2), an insulation shielding layer (3), a copper shielding layer (4), a stress cone (5), a stress cone insulation layer (6), a crimping terminal (7), an inner joint shielding layer (8), a main joint insulation layer (9), a sleeve (11) and an outer joint shielding layer (10), the main cross-linked polyethylene insulation layer (2) is arranged on the periphery of the wire core (1), the stress cone insulation layer (6) is arranged on the periphery of the main cross-linked polyethylene insulation layer (2), the stress cone (5) is arranged between the stress cone insulation layer (6) and the main cross-linked polyethylene insulation layer (2), the insulation shielding layer (3) and the copper shielding layer (4) are overlapped from inside to outside between the stress cone insulation layer (6) and the main cross-linked polyethylene insulation layer, sleeve pipe (11) are connected in crimping terminal (7), and sleeve pipe (11) periphery is equipped with and connects main insulating layer (9), connects to be equipped with between main insulating layer (9) and sleeve pipe (11) and connects inner shield layer (8), connects outer shield layer (10) and locates cable T type quick-operation joint's surface.
3. The modeling method of the cable T-shaped quick coupling three-dimensional electric field simulation model according to claim 2, wherein the step S10 is performed according to the following steps:
s11, carrying out geometric modeling on each part of the T-shaped quick joint of the cable according to the size of the T-shaped quick joint of the cable, and establishing a three-dimensional structure model;
s12, setting electrical property values of structural materials of all parts in a three-dimensional structure model of the T-shaped quick joint of the cable, and dividing grids to obtain an electric field analysis model of the T-shaped quick joint of the cable;
s13, according to the specification of the T-shaped quick connector of the cable, setting the voltage of a conductor of a wire core (1) in the electric field analysis model of the T-shaped quick connector of the cable, setting the boundary condition of electric field analysis of the T-shaped quick connector of the cable, and constructing the electric field analysis model of the T-shaped quick connector of the cable.
4. The modeling method of the three-dimensional electric field simulation model of the cable T-shaped quick joint according to claim 3, wherein in the step S12, the electrical property values comprise conductivity and relative permittivity; when the grids are divided, the stress cone (5), the inner shielding layer and the grids at the corners of the three-dimensional structure model of the T-shaped quick joint of the cable are subjected to refining analysis processing.
5. The modeling method of the three-dimensional electric field simulation model of the T-shaped quick joint of the cable according to claim 4, wherein the relative dielectric constants of the cable core (1), the main insulating layer (2) of the cross-linked polyethylene, the insulating shielding layer (3), the copper shielding layer (4), the crimping terminal (7), the stress cone (5), the stress cone insulating layer (6), the inner shielding layer (8) of the joint, the main insulating layer (9) of the joint, the outer shielding layer (10) of the joint and the sleeve (11) are respectively as follows: 1. 2.35, 30, 1, 50, 2.78, 50, 2.9, 50, 4.
6. The modeling method of the three-dimensional electric field simulation model of the T-shaped quick joint for the cable according to claim 4, wherein the electric conductivities of the cable core (1), the main insulating layer (2) of the cross-linked polyethylene, the insulating shielding layer (3), the copper shielding layer (4), the crimping terminal (7), the stress cone (5), the insulating layer (6) of the stress cone, the inner shielding layer (8) of the joint, the main insulating layer (9) of the joint, the outer shielding layer (10) of the joint and the sleeve (11) are respectively as follows: 5.998X 107S/m、1×10-14S/m、1×10-4S/m、5.998×107S/m、5.998×107S/m、1S/m、1×10-15S/m、1S/m、3×10-15S/m、1S/m、1×10-13S/m。
7. The modeling method of the cable T-shaped quick coupling three-dimensional electric field simulation model according to claim 3, wherein in step S13, the boundary conditions are: the insulation shielding layer (3) of the T-shaped quick joint of the cable is grounded with the outer shielding layer (10) of the joint.
8. The modeling method of the three-dimensional electric field simulation model of the cable T-shaped quick joint as claimed in claim 3, wherein in step S13, the voltage of the conductor of the wire core (1) in the electric field analysis model of the cable T-shaped quick joint is set to 10 kV.
9. The modeling method for the three-dimensional electric field simulation model of the cable T-shaped quick coupling according to any one of claims 1 to 8, wherein in step S2, the electric field control equation is as follows:
J＝σE+Je
wherein ^ is a vector differential operator; j is the current density vector, A/m3(ii) a Qj is electricityFlow source, A/m3(ii) a Sigma is the conductivity, S/m; e is the electric field vector, V/m; v is the potential, V; j. the design is a squareeFor external injection of current density, A/m3。
10. The modeling method of the cable T-shaped quick coupling three-dimensional electric field simulation model according to claim 9, wherein the potential V is a basic parameter, and other parameters are solved on the basis of the basic parameter.
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