1. Example Problem #1 230kV XLPE Cable Splice

2. Example Problem #1 230kV XLPE Cable Splice
Description:
Dielectric model of a cable splice consisting of two conductors, crimp connector, insulation, and an outer shield.
Solver:
2D RZ Electrostatic

3. Example Problem #1 230kV XLPE Cable Splice
Basic Procedure:
Create new 2D Electrostatic project
Import cable.sm2 file, and make four modifications as necessary
Setup materials
Setup boundaries/sources
Solve
Post Process

4. Example Problem #1 230kV XLPE Cable Splice
Step 1:
Create 2D RZ Electrostatic project: splice
The splice.pjt will open automatically

5. Example Problem #1 230kV XLPE Cable Splice
Step 2.1:
Change drawing plane to: RZ Plane
Verify that the solver is set to: Electrostatic
Enter the modeler using: Define Model/Draw Model
File Import/
../emprojects/floppy/cable.sm2

6. Example Problem #1 230kV XLPE Cable Splice
Step 2.2:
Set grid: Window/Grid/Suggested Spacing/Ok
or hit “g” on keyboard/Suggested Spacing/Ok
Change units to mm: Model/Drawing Units/mm/Rescale to new units/Ok
Change view: Window/Change View/Fit All of hit “f” on keyboard

7. Example Problem #1 230kV XLPE Cable Splice
Step 2.3:
Zoom in
Reset grid: Window/ Grid/ Suggested Spacing/ Ok
Draw crimp connector using polyline command: Object/ Polyline
Name: connector Color: green

8. Example Problem #1 230kV XLPE Cable Splice
Step 2.4:
Modify e_shield by removing edge and adding lower arc
Zoom in
Reset grid: Window/ Grid/ Suggested Spacing/ Ok
Delete lower straight edge: Reshape/edge/delete
Add additional vertical edge: Object/Polyline/click/double click to end
Create clockwise arc: Object/Arc/clockwise/Ok click on center/click on start point/click on end point/Ok/Ok
Select e_shield and then Boolean/ Simplify to remove extra vertices that are not necessary
(refer to drawing on next page)

9. Example Problem #1 230kV XLPE Cable Splice
10mm

10. Example Problem #1 230kV XLPE Cable Splice
Step 2.5:
Modify block insulator:
Zoom in
Turn on hatches for block insulator
Move vertex on epoxy block insulator: reshape/vertex/move
Turn off hatches for block insulator

11. Example Problem #1 230kV XLPE Cable Splice
Step 2.6:
Duplicate top cable insulation to create the bottom insulation:
Edit/ Deselect All
Click inside of top cable insulation to select it
Edit/Duplicate/ Mirror duplicate/ click on (0,0) click on (100,0) to “define mirror”
Edit/Attributes/Rename/ (type in insul_bottom)/ Rename/ Ok to change the copied object to insul_bottom

12. Example Problem #1 230kV XLPE Cable Splice
Step 2.7:
Finish modifying and exit:
Fit model to window: f
Fill solids: [control-hold] f
Edit/ Visibility/ Show All
Deselect All
File Save/File Exit

13. Example Problem #1 230kV XLPE Cable Splice
Step 2.8:
Group objects with same material and excitation (voltage) together:
Define model/Group Objects
insul_top/insul_bottom  insulation/Ok
cond_top/cond_bottom  conductor/Ok/Exit/Yes

14. Example Problem #1 230kV XLPE Cable Splice
Step 3:
Setup Material Properties:
[conductor] and connector/copper/assign
e_shield and outershield/aluminum/assign
Material/add/XLPE1/eps=3.25/cond=0/Enter
[insulation]/XLPE1/assign
Material/add/XLPE2/eps=7.0/cond=0/Enter
[block_insulator]/XLPE2/assign
Background/ Exclude/ Exit

15. Example Problem #1 230kV XLPE Cable Splice

16. Example Problem #1 230kV XLPE Cable Splice
Step 4:
Setup Boundary/Sources:
Edit/Select/Object/by clicking/ conductor, connector, and e_shield/ right click
Assign/Source/Solid/Name: line/ volts/Assign
Edit/Select/ Object/by clicking/ outershield/right click
Assign/Source/Solid/Name: ground/0 volts/color green/Assign
File/Save/File/Exit

17. Example Problem #1 230kV XLPE Cable Splice
Step 5:
Solve the problem:
Solve/Nominal problem
(please note it is not always necessary to go into Setup Solution/Options)
View the Convergence table
View the Profile information

18. Example Problem #1 230kV XLPE Cable Splice

19. Example Problem #1 230kV XLPE Cable Splice
Step 6.1
Post process the problem and create an equipotential plot:
Select the Post Processor/Nominal Problem
Plot/Field/Plot Quantity: phi/ On Geometry: Surface -all- / In Area: -all- / Ok
Uncheck filled (to get a contour plot) and accept all other default conditions by clicking on Ok

20. Example Problem #1 230kV XLPE Cable Splice

21. Example Problem #1 230kV XLPE Cable Splice
Step 6.2
Create an E-field plot:
Choose Plot/ Visibility and turn off the voltage plot
Plot/Field/Plot Quantity: mag E / On Geometry: Surface -all- / In Area: -all- / Ok
Check filled to get a shaded plot
Select “use limits” and change maximum to 2e7
Accept all other default conditions by clicking on Ok

22. Example Problem #1 230kV XLPE Cable Splice
E-field in
V/m

23. Example Problem #1 230kV XLPE Cable Splice
Step 6.3
Change the units on the E-field plot to kV/mm:
Choose Plot/ Visibility and turn off the E-field plot
Select Data/ Calculator
Choose Constant/ Conversion Constants and select: Quantity: ElectricField, From V/m, To kV/mm and click on Ok
Exch/ Rlup/ * / RlDn
Plot/ Name: E (kV/mm)
Change maximum to 20 instead of 2e7
Accept all other default conditions by clicking on Ok

24. Example Problem #1 230kV XLPE Cable Splice
E-field in kV/mm

25. Example Problem #1 230kV XLPE Cable Splice
Step 6.4
Graph E-field along front of e_shield using the line already created in the 2D modeler:
Choose Plot/ Visibility and turn off the E (kV/mm) shade plot
Select Data/ Calculator
Pop/ Geom/ Line/ e_shield_front/ ok/ 2D plot/ Name: Magnitude/ ok
Note: the line e_shield_front was drawn in the modeler and was automatically imported into the post processor

26. Example Problem #1 230kV XLPE Cable Splice
Step 6.5
Decompose E-field along front of e_shield into R, Z, normal, and tangential components:
Select: Data /Calculator /Quantity/ E/ Smooth/ Number/ Scalar/ 1e-6/ ok/ *
Scalar R/ exchange/ 2D Plot/ Name: R component/ ok
Exchange/ Undo/ Scalar Z/ Exchange/ 2D Plot/ Name: Z component/ ok
Exchange/ Undo/ Exchange/ Normal/ Undo/ 2D plot/ Name: Normal/ ok
Exchange/ Undo/ pop/ Exchange/ Tangent/ Undo/ 2D plot/ Name: Tangent/ ok
Choose Plot/ Format/ Axis and add following descriptions:
Heading: Components of E Field along front of shield
X Label: Distance (mm)
Y Label: E Field (kV/mm)

27. Example Problem #1 230kV XLPE Cable Splice