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HV Coil Excitation and Multi turn coil modeling
Posted Apr 25, 2011, 12:02 a.m. EDT Low-Frequency Electromagnetics Version 3.5a 1 Reply
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Hi ,
I am designing a HV (5kV ) multi turn coil. I have been through all the discussions about the multi turn coils. But it is not very clear to me. Let me explain my objective in brief.
1. To design a multi turn HV coil on an iron core submerged in a oil tank.
2. Excite it with voltage (not current )
3. Observe the electric field distribution and resistive heating in insulation on various frequencies.
i have designed the coil in 2D axis symmetry. My question is how to excite the coil with voltage?
I would appreciate if anyone can answer my question.
regards,
Muhammad
I am designing a HV (5kV ) multi turn coil. I have been through all the discussions about the multi turn coils. But it is not very clear to me. Let me explain my objective in brief.
1. To design a multi turn HV coil on an iron core submerged in a oil tank.
2. Excite it with voltage (not current )
3. Observe the electric field distribution and resistive heating in insulation on various frequencies.
i have designed the coil in 2D axis symmetry. My question is how to excite the coil with voltage?
I would appreciate if anyone can answer my question.
regards,
Muhammad
1 Reply Last Post Apr 25, 2011, 3:29 a.m. EDT
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Posted:
1 decade ago
Hi
if you have such a high power transformer, you might have drawn each coil (anyhow in 3.5 I do not believe you have the new v4 "multi-turn coil BC" that does everything for you, search the forum for other references, apart your specific heating issue).
If I remember right, in 3.5, you can only define a current as is, to apply a voltage you must define a new dependent variable Vcoil and get COMSOL to resolve it by adjusting the current an estimating the resistance. Then if you have several turns you need to define Vcoil_i one per "i" coil turn and add them up to get the total voltage, assuming a constant total current. Take car to resolve correctly the skin effect (perhaps not too critical if you are at 50/60 Hz).
It's a challenging but perfectly achievable task. The best is to start with some similar and simple "school-book" examples to get familiar with the set-up, and to validate the procedure, then to tackle your specific model.
--
Good luck
Ivar
if you have such a high power transformer, you might have drawn each coil (anyhow in 3.5 I do not believe you have the new v4 "multi-turn coil BC" that does everything for you, search the forum for other references, apart your specific heating issue).
If I remember right, in 3.5, you can only define a current as is, to apply a voltage you must define a new dependent variable Vcoil and get COMSOL to resolve it by adjusting the current an estimating the resistance. Then if you have several turns you need to define Vcoil_i one per "i" coil turn and add them up to get the total voltage, assuming a constant total current. Take car to resolve correctly the skin effect (perhaps not too critical if you are at 50/60 Hz).
It's a challenging but perfectly achievable task. The best is to start with some similar and simple "school-book" examples to get familiar with the set-up, and to validate the procedure, then to tackle your specific model.
--
Good luck
Ivar