Dielectric breakdown in gases typically involves the avalanche ionization of the gas molecules by energetic electrons accelerated by the applied field. The mean free path between collisions must be sufficiently long to allow the electrons to gain sufficient energy from the field to impact-ionize the gas molecules. The breakdown voltage, Vbr, between two electrodes depends on the distance, d, between the electrodes as well as the gas pressure, P, as shown in Figure 7Q10-1. Vbr versus Pd plots are called Paschen curves. We consider gaseous insulation, air and SF6, in an HV switch. a. What is the breakdown voltage between two electrodes of a switch separated by a 5 mm gap with air at 1 atm when the gaseous insulation is air and when it is SF6? b. What are the breakdown voltages in the two cases when the pressure is 10 times greater? What is your conclusion? c. At what pressure is the breakdown voltage minimum? d. What air gap spacing, d, at 1 atm gives the minimum breakdown voltage? e. What would be the reasons for preferring gaseous insulation over liquid or solid insulation?

Dielectric breakdown in gases typically involves the avalanche ionization of the gas molecules by
energetic electrons accelerated by the applied field. The mean free path between collisions must be
sufficiently long to allow the electrons to gain sufficient energy from the field to impact-ionize the
gas molecules. The breakdown voltage, Vbr, between two electrodes depends on the distance, d,
between the electrodes as well as the gas pressure, P, as shown in Figure 7Q10-1. Vbr versus Pd
plots are called Paschen curves. We consider gaseous insulation, air and SF6, in an HV switch.
a. What is the breakdown voltage between two electrodes of a switch separated by a 5 mm gap with
air at 1 atm when the gaseous insulation is air and when it is SF6?
b. What are the breakdown voltages in the two cases when the pressure is 10 times greater? What is
your conclusion?
c. At what pressure is the breakdown voltage minimum?
d. What air gap spacing, d, at 1 atm gives the minimum breakdown voltage?
e. What would be the reasons for preferring gaseous insulation over liquid or solid insulation?

Solution:

15% off for this assignment.

Our Prices Start at $11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!

Why US?

100% Confidentiality

Information about customers is confidential and never disclosed to third parties.

Timely Delivery

No missed deadlines – 97% of assignments are completed in time.

Original Writing

We complete all papers from scratch. You can get a plagiarism report.

Money Back

If you are convinced that our writer has not followed your requirements, feel free to ask for a refund.