L
Lord Snooty
- Jan 1, 1970
- 0
I'm looking for a dielectric material that can be used in a capacitor subject
to AC, which should have the following characteristics:
1. Should be able to be used in high power and high frequency situations
2. Should have as high a permittivity as possible
3. Exhibits the highest possible polarising velocity of its ions when subject
to AC electric fields.
#3 is the unusual one. It refers to the small displacements that occur in a
dielectric when polarised. I want the charges on the polarised molecules to
move as fast as possible for a given applied voltage. Maximum velocity will
correspond, for sinusoidal AC, to the zero-volts crossing point, since maximum
acceleration occurs at peak volts - and velocity and acceleration are phased
90 degrees apart for a sinewave.
I am wondering whether a liquid dielectric would be the best bet in respect of
#3. How does one calculate the value of the polarising velocity in any case,
for the kind of dielectrics commonly used in HV capacitors?
to AC, which should have the following characteristics:
1. Should be able to be used in high power and high frequency situations
2. Should have as high a permittivity as possible
3. Exhibits the highest possible polarising velocity of its ions when subject
to AC electric fields.
#3 is the unusual one. It refers to the small displacements that occur in a
dielectric when polarised. I want the charges on the polarised molecules to
move as fast as possible for a given applied voltage. Maximum velocity will
correspond, for sinusoidal AC, to the zero-volts crossing point, since maximum
acceleration occurs at peak volts - and velocity and acceleration are phased
90 degrees apart for a sinewave.
I am wondering whether a liquid dielectric would be the best bet in respect of
#3. How does one calculate the value of the polarising velocity in any case,
for the kind of dielectrics commonly used in HV capacitors?