Question

4. (a) (i) Explain with neat diagram how rod gaps can be used for measurement of high voltages. Compare its performance with a sphere gap.

(ii) Explain with neat diagram the principle of operation of an Electrostatic Voltmeter. Discuss its advantages and limitations for high voltage measurements.

Or

(b) A Rogowski coil is required to measure impulse current of 8 kA having rate of change of current of 1010 A/sec. The voltmeter is connected across the integrating circuit which reads 8 volts for full scale deflection. The input to the integrating circuit is from the Rogowski Coil. Determine the mutual inductance of coil, R and C of the integrating circuit.

Answer 1