KOLEKTOR ETRA

1. dr. Nikola Jakšić
2016 ANSYS Convergence Conference
Ljubljana, Slovenia, 25 May 2016
Examples of successful simulation in the
development cycle of Kolektor Etra
KOLEKTOR ETRA d.o.o.

2. • About Kolektor Etra
• Main transformer parts
• Noise
– TrafoS application:
• Transformer core dynamics
• Winding dynamics
• Complete transformer dynamics
– Winding magnetic forces
• Design optimization
Overview
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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3. • Type of enterprise: Limited Liability Company
• Total company area: 44.769 m2
• Buildings: 19.638 m2
• Employees: 330
• Technical sector: 72
Kolektor ETRA
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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4. Main transformer parts
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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Transformer core
Winding
Drying of active part.
Electrical tests in laboratory.

5. • TrafoS was developed in cooperation with UL FS LADISK.
• MATLAB GUI application runs ANSYS in background.
• Prediction of transformer noise.
TrafoS
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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TrafoS application.

6. TrafoS – transformer core
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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Static analysis for determining
normal pressure due to core
clamping.
Modal analysis of
laminated core with
inclusion of interlaminar
friction effects*.
* Pirnat, M., Čepon, G., Boltežar, M. (2013), Introduction of the linear contact model in the dynamic model of laminated
structure dynamics: an experimental and numerical identification, Mech. mach. theory, vol. 64, pp. 144-154.

7. TrafoS – windings
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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Winding model.
Winding harmonic response due to
magnetic forces.

8. TrafoS – transformer dynamics
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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Creo 3D model for technical drawings.
Finished ANSYS model with core,
windings and oil. Solid-fluid
interaction included.
Harmonic analysis of the
model.

9. • Calculation of electromagnetic forces
Winding magnetic forces
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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Magnetic flux density.
Magnetic forces.
2D axisymmetric model.
Magnetic core
Air
Low voltage
winding
High voltage
winding

10. Design optimization
(Virtual prototyping)
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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Structural integrity is ensured by the numerical modelling

11. Design optimization
(Virtual prototyping)
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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m=323000kg
crane lifting
hydraulic jacks lifting
railway transport
Fmax = m*g/2

12. • The Expert System
Design optimization (Automatic)
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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13. • Wall of the transformer tank with ribs –
parametric model
Design optimization (Automatic)
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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14. • Wall of the
transformer tank
with ribs – APDL
created model
Design optimization (Automatic)
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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15. Design optimization (Automatic)
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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EXCEL
• Input data
• Output data
PYTHON
• Process driver
• Outer optimization loop
ANSYS
• Solver for the mechanical model
• Main optimization driver
LATEX
• Report creator

16. Design optimization (Automatic)
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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• Resulting report

17. Design optimization (Automatic)
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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•Resultingreport

18. • 3D models  Ansys WB
• Parametric modelling  Ansys APDL
• Both approaches are used!
• Both approaches are needed!
Conclusion
2016 ANSYS Convergence conference
Ljubljana, Slovenia, 25 May 2016
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19. Thank you for your attention.