9.16 A conductor with cross-sectional area of 10 cm carries a conduction current 0.2 sin 10°t mA. Given that o = 2.5 X 10 S/m and e, = 6, calculate the magnitude of the dis- placement current density.
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- Each of the three insulators forming a string has a self capacitance of C farad. The shunt capacitance of each insulator is 0-2 C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the metal work of the lowest insulator to 0-3 C. Calculate the string efficiency of the arrangement : (1) with the guard ring, (ii) without guard ring. [1) 95% (i) 86-13%]Estimate the dielectric losses in the solid specimen subjected to an alternating field of 40KV/cm, has an absolute permittivity of 4.445 x10-11 and the loss angle of that solid dielectric material is 0.28647at Oman power frequency. And also the same specimen while subjected to 3 KV/cm DC supply with the resistance value of 10 Mega Ohm, then determine the heat generated in the specimen.A coaxial cable has an inside wire with a 1.2 mm radius and an outside conductor with an inside radius 1.4 mm and an outside radius of 1.7 mm. Take the insulator between the conductors to have a dielectric constant of 8.30. If it is connected across a 95 V de source then what is the energy per length (U/L) of the conductors
- A parallel-plate capacitor using a dielectric material having an Pr of 2.2 has a plate spacing of 2 mm (0.08 in.). If another material having a dielectric constant of 3.7 is used and the capacitance is to be unchanged, what must the new spacing be between the plates?8. Each of the three insulators forming a string has a self capacitance of C farad The shunt capacitance of each insulator is 02C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the metal work of the lowest insulator to 0-3 C. Calculate the string efficiency of the arrangement: )with the guard ring. (7) without guard ring. 10 95% () 86 13%|Q5: What is the values of (P.d)min & ( Vbr)min for a gas dielectric with constants A=14, B=362 and Y=0.04/torr.cm
- 8. Each of the three insulators forming a string has a self capacitance of C farad. The shunt capacitance of each insulator is 0-2 C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the metal work of the lowest insulator to 0-3 C. Calculate the string efficiency of the arrangement: (i) with the guard ring, (ii) without guard ring. [(i) 95% (ii) 86-13%)7. Each of three insulators forming a string has self-capacitance of “C" farad. The shunt capacitance of each o h cap of insulator is 0-25 C to earth and 0-15 C to line. Calculate the voltage distribution across each insulator as a pecentage of line voltage to earth and the string efficiency. [ 31-7%, 29-4%, 38-9%; 85-7%]A solid dielectric specimen of dielectric constant of 4.0 has internal void of thickness 0.05 mm. The specimen is 0.5 cm thick and is subjected to a voltage of 40 kV (rms). If the void is filled with air and if the breakdown strength of air can be taken as 30 kV (peak)/cm, find the voltage at which an internal discharge can occur.
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