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IEEH
Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Designing of Endwinding Corona Protection by help of Simulation
Milan, 09.10.2012 Moyan Wei
Excerpt from the Proceedings of the 2012 COMSOL Conference in Milan
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Milan, 10/23/2012 Slide 2
Outline
1 Introduction and Motivation 2 Simulative approach with COMSOL
3 Conclusion
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 3
1 Introduction and Motivation Field of application – HV Rotating Machines
Milan, 10/23/2012
Endwinding Corona Protection (ECP)
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 4 Milan, 10/23/2012
no ECP
U
x
Conductor
GND CORE
Insulation
This potential jump could lead to discharge, which are harmful to the insulation
with ECP
ECP Control of potential distribution is realized by applying ECP layer onto the coil surface
Problem: ECP causes extra loss and heating
Potential jump at the end of GND
1 Introduction and Motivation Potential Control
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 5 Milan, 10/23/2012
GND ECP
GND ECP
To be clear: • Value of the field strength • Temperature of the Object
Thermal runaway
Study the details of electrical and thermal behavior of ECP
FEM modeling: Electric Current Heat Transfer
1 Introduction and Motivation Overheating of the ECP
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 6 Milan, 10/23/2012
Cu ISO
Heat Transfer: ECP as heat source; initial and ambient temperature: 25°C; convective and radiative cooling.
Electric Current: AC (50Hz Û=31kV), GND
2 Simulative Approach 2D Axisymmetric
ECP
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 7 Milan, 10/23/2012
The inner impedance of the probe has influenced the measure-ment!
2 Simulative Approach Potential Distribution Û=31 kV
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 8 Milan, 10/23/2012
2 Simulative Approach Temperature Distribution 2D Û=31 kV
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 9 Milan, 10/23/2012
Cu strips serve as measuring electrodes, but have different emissivity
2 Simulative Approach Temperature Distribution 2D Û=31 kV
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 10
2 Simulative Approach 3D Modeling
Milan, 10/23/2012
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 11
2 Simulative Approach Temperature Distribution: 3D Û=31 kV
Milan, 10/23/2012
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Slide 12
2 Simulative Approach Temperature Distribution: 3D Û=31 kV
Milan, 10/23/2012
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
• Simulation tools for 2D and 3D were developed • Pre-calculation: Potential distribution • Pre-calculation: Heating effect • Experimental verification • Successfully applied in ECP design
Slide 13 Milan, 10/23/2012
3 Conclusion
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Faculty of Electrical and Computer Engineering Institute of Electrical Power Systems and High Voltage Engineering
Thank you for your attention
Slide 14 Milan, 10/23/2012