Hello everyone,
currently I am kind of lost at my material science class homework because I basically have no real clue about electronics which is needed for this particular assignment.
For the down time of a wind energy device, a capacitor should be able to "keep" 150 kWh of energy while an electric field of min 350 MV/m is applied.
Basically I found a plastic-foil-capacitor suitable as it can handle electric fields of up to 500 MV/m.
But heres my problem:
Formula for the energy in a capacitor: E=0,5 C U²
and C = epsilonr*epsilon0*A/d
150kWh is equivalent about 520 MJ. If I choose a voltage of 220V as in most households in Europe, I get a capacity of about 20000 Farad which as I have seen on wikipedia is not do-able with normal capacitor. They tend to be around the mikrofarads or even smaller?
What I am doing wrong? Would be so great if someone could help me out. Thanks
currently I am kind of lost at my material science class homework because I basically have no real clue about electronics which is needed for this particular assignment.
For the down time of a wind energy device, a capacitor should be able to "keep" 150 kWh of energy while an electric field of min 350 MV/m is applied.
Basically I found a plastic-foil-capacitor suitable as it can handle electric fields of up to 500 MV/m.
But heres my problem:
Formula for the energy in a capacitor: E=0,5 C U²
and C = epsilonr*epsilon0*A/d
150kWh is equivalent about 520 MJ. If I choose a voltage of 220V as in most households in Europe, I get a capacity of about 20000 Farad which as I have seen on wikipedia is not do-able with normal capacitor. They tend to be around the mikrofarads or even smaller?
What I am doing wrong? Would be so great if someone could help me out. Thanks