Q2D: Cable parameter identification

This example shows how you can use PyAEDT to perform these tasks:

• Create a Q2D design using the Modeler primitives and importing part of the geometry.

• Set up the entire simulation.

• Link the solution to a Simplorer design.

For cable information, see 4 Core Armoured Power Cable

Perform required imports

import ansys.aedt.core
import math

Set AEDT version

Set AEDT version.

aedt_version = "2024.2"

Initialize core strand dimensions and positions

Initialize cable sizing - radii in mm.

c_strand_radius = 2.575
cable_n_cores = 4
core_n_strands = 6
core_xlpe_ins_thickness = 0.5
core_xy_coord = math.ceil(3 * c_strand_radius + 2 * core_xlpe_ins_thickness)

Initialize filling and sheath dimensions

Initialize radii of further structures incrementally adding thicknesses.

filling_radius = 1.4142 * (core_xy_coord + 3 * c_strand_radius + core_xlpe_ins_thickness + 0.5)
inner_sheath_radius = filling_radius + 0.75
armour_thickness = 3
armour_radius = inner_sheath_radius + armour_thickness
outer_sheath_radius = armour_radius + 2

Initialize armature strand dimensions

Initialize radii.

armour_centre_pos = inner_sheath_radius + armour_thickness / 2.0
arm_strand_rad = armour_thickness / 2.0 - 0.2
n_arm_strands = 30

Initialize dictionaries

Initialize dictionaries that contain all the definitions for the design variables and output variables.

core_params = {
    "n_cores": str(cable_n_cores),
    "n_strands_core": str(core_n_strands),
    "c_strand_radius": str(c_strand_radius) + 'mm',
    "c_strand_xy_coord": str(core_xy_coord) + 'mm'
}
outer_params = {
    "filling_radius": str(filling_radius) + 'mm',
    "inner_sheath_radius": str(inner_sheath_radius) + 'mm',
    "armour_radius": str(armour_radius) + 'mm',
    "outer_sheath_radius": str(outer_sheath_radius) + 'mm'
}
armour_params = {
    "armour_centre_pos": str(armour_centre_pos) + 'mm',
    "arm_strand_rad": str(arm_strand_rad) + 'mm',
    "n_arm_strands": str(n_arm_strands)
}

Initialize Q2D

Initialize Q2D, providing the version, path to the project, and the design name and type.

project_name = 'Q2D_ArmouredCableExample'
q2d_design_name = '2D_Extractor_Cable'
setup_name = "MySetupAuto"
sweep_name = "sweep1"
tb_design_name = 'CableSystem'
q2d = ansys.aedt.core.Q2d(project=project_name, design=q2d_design_name, version=aedt_version)

C:\actions-runner\_work\_tool\Python\3.10.9\x64\lib\subprocess.py:1072: ResourceWarning: subprocess 3076 is still running
  _warn("subprocess %s is still running" % self.pid,
C:\actions-runner\_work\pyaedt\pyaedt\.venv\lib\site-packages\ansys\aedt\core\generic\settings.py:231: ResourceWarning: unclosed file <_io.TextIOWrapper name='D:\\Temp\\pyaedt_ansys_260622a4-692f-48cc-bef3-b1a76554a3cc.log' mode='a' encoding='cp1252'>
  self.__logger = val

Define variables from dictionaries

Define design variables from the created dictionaries.

for k, v in core_params.items():
    q2d[k] = v
for k, v in outer_params.items():
    q2d[k] = v
for k, v in armour_params.items():
    q2d[k] = v

Create object to access 2D modeler

Create the mod2D object to access the 2D modeler easily.

mod2D = q2d.modeler
mod2D.delete()
mod2D.model_units = "mm"

Initialize required material properties

Cable insulators require the definition of specific materials since they are not included in the Sys Library. Plastic, PE (cross-linked, wire, and cable grade)

mat_pe_cable_grade = q2d.materials.add_material("plastic_pe_cable_grade")
mat_pe_cable_grade.conductivity = "1.40573e-16"
mat_pe_cable_grade.permittivity = "2.09762"
mat_pe_cable_grade.dielectric_loss_tangent = "0.000264575"
mat_pe_cable_grade.update()
# Plastic, PP (10% carbon fiber)
mat_pp = q2d.materials.add_material("plastic_pp_carbon_fiber")
mat_pp.conductivity = "0.0003161"
mat_pp.update()

True

Create geometry for core strands, filling, and XLPE insulation

mod2D.create_coordinate_system(['c_strand_xy_coord', 'c_strand_xy_coord', '0mm'], name='CS_c_strand_1')
mod2D.set_working_coordinate_system('CS_c_strand_1')
c1_id = mod2D.create_circle(['0mm', '0mm', '0mm'], 'c_strand_radius', name='c_strand_1', material='copper')
c2_id = c1_id.duplicate_along_line(vector=['0mm', '2.0*c_strand_radius', '0mm'], nclones=2)
mod2D.duplicate_around_axis(c2_id, axis="Z", angle=360 / core_n_strands, clones=6)
c_unite_name = mod2D.unite(q2d.get_all_conductors_names())

fill_id = mod2D.create_circle(['0mm', '0mm', '0mm'], '3*c_strand_radius', name='c_strand_fill',
                              material='plastic_pp_carbon_fiber')
fill_id.color = (255, 255, 0)
xlpe_id = mod2D.create_circle(['0mm', '0mm', '0mm'], '3*c_strand_radius+' + str(core_xlpe_ins_thickness) + 'mm',
                              name='c_strand_xlpe',
                              material='plastic_pe_cable_grade')
xlpe_id.color = (0, 128, 128)

mod2D.set_working_coordinate_system('Global')
all_obj_names = q2d.get_all_conductors_names() + q2d.get_all_dielectrics_names()
mod2D.duplicate_around_axis(all_obj_names, axis="Z", angle=360 / cable_n_cores, clones=4)
cond_names = q2d.get_all_conductors_names()

Create geometry for filling object

filling_id = mod2D.create_circle(['0mm', '0mm', '0mm'], 'filling_radius', name='Filling',
                                 material='plastic_pp_carbon_fiber')
filling_id.color = (255, 255, 180)

Create geometry for inner sheath object

inner_sheath_id = mod2D.create_circle(['0mm', '0mm', '0mm'], 'inner_sheath_radius', name='InnerSheath',
                                     material='PVC plastic')
inner_sheath_id.color = (0, 0, 0)

Create geometry for armature fill

arm_fill_id = mod2D.create_circle(['0mm', '0mm', '0mm'], 'armour_radius', name='ArmourFilling',
                                  material='plastic_pp_carbon_fiber')
arm_fill_id.color = (255, 255, 255)

Create geometry for outer sheath

outer_sheath_id = mod2D.create_circle(['0mm', '0mm', '0mm'], 'outer_sheath_radius', name='OuterSheath',
                                     material='PVC plastic')
outer_sheath_id.color = (0, 0, 0)

Create geometry for armature steel strands

arm_strand_1_id = mod2D.create_circle(['0mm', 'armour_centre_pos', '0mm'], '1.1mm', name='arm_strand_1',
                                      material='steel_stainless')
arm_strand_1_id.color = (128, 128, 64)
arm_strand_1_id.duplicate_around_axis('Z', '360deg/n_arm_strands', clones='n_arm_strands')
arm_strand_names = mod2D.get_objects_w_string('arm_strand')

Create region

region = q2d.modeler.create_region([500, 500, 500, 500])
region.material_name = "vacuum"

Assign conductors and reference ground

obj = [q2d.modeler.get_object_from_name(i) for i in cond_names]
[q2d.assign_single_conductor(assignment=i, name='C1' + str(obj.index(i) + 1), conductor_type='SignalLine') for i
 in obj]
obj = [q2d.modeler.get_object_from_name(i) for i in arm_strand_names]
q2d.assign_single_conductor(assignment=obj, name="gnd", conductor_type="ReferenceGround")
mod2D.fit_all()

Assign design settings

lumped_length = "100m"
q2d_des_settings = q2d.design_settings
q2d_des_settings['LumpedLength'] = lumped_length

Insert setup and frequency sweep

q2d_setup = q2d.create_setup(name=setup_name)
q2d_sweep = q2d_setup.add_sweep(name=sweep_name)

Analyze setup

# q2d.analyze(name=name)

Add a Simplorer/Twin Builder design and the Q3D dynamic component

tb = ansys.aedt.core.TwinBuilder(design=tb_design_name)

Add a Q3D dynamic component

tb.add_q3d_dynamic_component(project_name, q2d_design_name, setup_name, sweep_name, coupling_matrix_name="Original",
                             model_depth=lumped_length)

<ansys.aedt.core.modeler.circuits.object_3d_circuit.CircuitComponent object at 0x000002724E4C0E20>

Save project and release desktop

tb.save_project()
tb.release_desktop(True, True)

True