Properties of High Voltage Dielectrics

High Voltage Dielectrics are used for insulation of cables at high voltages.  These dielectrics are subjected to very high stresses and temperatures.  They also have very demanding reliability requirements. 

Some of the common properties of High Voltage Dielectrics are

  1. Dielectrics should be flexible as this reduces the bending radius.  A lower bending radius enables cables to take turns in small spaces. 
  2. The Permittivity should be low so that the charging current is as low as possible
  3. The power factor of the dielectric should be low so that the heat generated is minimum.
  4. The Impulse strength of the insulation should be high.