a) What is thermal breakdown in solid dielectric? How is it practically more important than other methods?
b) A solid specimen of dielectric consists of a dielectric constant of 4.2, and tan = 0.0001 at a frequency of 50 Hz. If it is subjected to an alternating field of 50 kV/cm, compute the heat generated in the specimen due to the dielectric loss.
problem 2: Give the temperature classification of solid insulating materials. Why is this categorization not done for liquids and gases?
a) Describe the properties and applications of Fiber solid dielectric materials used in practice in the high voltage engineering.
b) Describe about the avalanche breakdown in solid dielectric material.
problem 4: Describe the different method by which break down in solid dielectrics in practice.
a) describe the method of short-term breakdown of composite solid insulating material.
b) A coaxial cylindrical capacitor is to be designed with an effective length of 20 cm. The capacitor is expected to have a capacitor of 1000 pF and to operate at 150 kHz. Choose an appropriate insulating material and give the dimensions of the electrode.