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3 (a) Suppose a dielectric sample has a surrounding ambient temperature To which is lower than 300 K. What will be its impact on Ec (increase or decrease)? If the value of Ec needs to be restricted, how you will choose the impulse time te (increase or decrease)? Explain. (b) For a porcelain solid slab dielectric insulator, Cy = 1.16 kJ/kg °K, u =0.25 eV, oo = 2.45 W/m °K and To = 420 K. For te = 3.35 µs, what is the value of critical breakdown field Eci? (c) If the specimen thickness is 5.48 cm, what is the breakdown voltage Vb1?

3 (a) Suppose a dielectric sample has a surrounding ambient temperature To which is lower than 300 K. What will be its impact on Ec (increase or decrease)? If the value of Ec needs to be restricted, how you will choose the impulse time te (increase or decrease)? Explain. (b) For a porcelain solid slab dielectric insulator, Cy = 1.16 kJ/kg °K, u =0.25 eV, oo = 2.45 W/m °K and To = 420 K. For te = 3.35 µs, what is the value of critical breakdown field Eci? (c) If the specimen thickness is 5.48 cm, what is the breakdown voltage Vb1?

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3 (a) Suppose a dielectric sample has a surrounding ambient temperature To which is lower than 300 K. What will be its impact on Ec (increase or decrease)? If the value of Ec needs to be restricted, how you will choose the impulse time to (increase or decrease)? Explain. (b) For a porcelain solid slab dielectric insulator, Cv = 1.16 kJ/kg °K, u =0.25 eV, 0o = 2.45 W/m °K and To = 420 K. For te = 3.35 us, what is the value of critical breakdown field Eei? (c) If the specimen thickness is 5.48 cm, what is the breakdown voltage Vb1? (d) Now consider for the same porcelain slab of 3(b), To is now 220 K and all other parameters are unchanged. What is the value of new critical breakdown field Ec2 ? (e) For the same specimen thickness of 3(c), what is the new breakdown voltage Vb2 ? What is the ratio Vb2/ Vb1 ? u E.? = 3 (오) () 7.? exo Cy 2 E
Transcribed Image Text:3 (a) Suppose a dielectric sample has a surrounding ambient temperature To which is lower than 300 K. What will be its impact on Ec (increase or decrease)? If the value of Ec needs to be restricted, how you will choose the impulse time to (increase or decrease)? Explain. (b) For a porcelain solid slab dielectric insulator, Cv = 1.16 kJ/kg °K, u =0.25 eV, 0o = 2.45 W/m °K and To = 420 K. For te = 3.35 us, what is the value of critical breakdown field Eei? (c) If the specimen thickness is 5.48 cm, what is the breakdown voltage Vb1? (d) Now consider for the same porcelain slab of 3(b), To is now 220 K and all other parameters are unchanged. What is the value of new critical breakdown field Ec2 ? (e) For the same specimen thickness of 3(c), what is the new breakdown voltage Vb2 ? What is the ratio Vb2/ Vb1 ? u E.? = 3 (오) () 7.? exo Cy 2 E
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