Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > Dielectric strength of SF6 isa)less than that...
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Dielectric strength of SF6 is
- a)less than that of air at atmospheric pressure
- b)less than that of oil used in OCB
- c)more than that of oil used in OCB
- d)more at lower pressure and low at higher pressures
Correct answer is option 'B'. Can you explain this answer?
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Dielectric strength of SF6 isa)less than that of air at atmospheric pr...
SF6 gas as insulating and arc-quenching medium. Sulphur hexafluoride gas (SF6) is employed as insulation in all parts of the installation, and in the circuit-breaker also for arc-quenching. SF6 is an electronegative gas, its dielectric strength at atmospheric pressure is approximately three times that of air.
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Dielectric strength of SF6 isa)less than that of air at atmospheric pr...
Dielectric strength is a measure of the electric field strength a material can withstand before it breaks down and allows current to flow. It is an important characteristic when designing electrical insulation systems. In this question, we are comparing the dielectric strength of SF6 (sulfur hexafluoride) with that of oil used in oil circuit breakers (OCB) and air at atmospheric pressure.
Less than that of air at atmospheric pressure
The dielectric strength of air at atmospheric pressure is typically around 3 kV/mm. This means that air can withstand an electric field of 3 kilovolts per millimeter before it breaks down. SF6 has a higher dielectric strength compared to air at atmospheric pressure. Therefore, option (a) is incorrect.
Less than that of oil used in OCB
Oil used in OCB has a high dielectric strength, typically around 20-40 kV/mm. This means that oil can withstand a higher electric field before it breaks down compared to SF6. Therefore, option (b) is correct.
More than that of oil used in OCB
Option (c) is incorrect because SF6 has a lower dielectric strength compared to oil used in OCB.
More at lower pressure and low at higher pressures
SF6 has a unique property known as the Paschen curve. The dielectric strength of SF6 decreases with increasing pressure up to a certain point, beyond which it starts to increase again. At low pressures, SF6 has a higher dielectric strength compared to both air and oil. However, at higher pressures, the dielectric strength of SF6 decreases. Therefore, option (d) is incorrect.
In conclusion, the dielectric strength of SF6 is less than that of oil used in OCB. Oil has a higher dielectric strength and can withstand a higher electric field before breaking down compared to SF6.
Less than that of air at atmospheric pressure
The dielectric strength of air at atmospheric pressure is typically around 3 kV/mm. This means that air can withstand an electric field of 3 kilovolts per millimeter before it breaks down. SF6 has a higher dielectric strength compared to air at atmospheric pressure. Therefore, option (a) is incorrect.
Less than that of oil used in OCB
Oil used in OCB has a high dielectric strength, typically around 20-40 kV/mm. This means that oil can withstand a higher electric field before it breaks down compared to SF6. Therefore, option (b) is correct.
More than that of oil used in OCB
Option (c) is incorrect because SF6 has a lower dielectric strength compared to oil used in OCB.
More at lower pressure and low at higher pressures
SF6 has a unique property known as the Paschen curve. The dielectric strength of SF6 decreases with increasing pressure up to a certain point, beyond which it starts to increase again. At low pressures, SF6 has a higher dielectric strength compared to both air and oil. However, at higher pressures, the dielectric strength of SF6 decreases. Therefore, option (d) is incorrect.
In conclusion, the dielectric strength of SF6 is less than that of oil used in OCB. Oil has a higher dielectric strength and can withstand a higher electric field before breaking down compared to SF6.
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Dielectric strength of SF6 isa)less than that of air at atmospheric pressureb)less than that of oil used in OCBc)more than that of oil used in OCBd)more at lower pressure and low at higher pressuresCorrect answer is option 'B'. Can you explain this answer?
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