Dielectric characteristic of dichlorodifluoromethane (R12) gas and mixture with [inline-formula]/air as an alternative to [inline-formula] gas

• Main Authors: Rahmat Ullah, Abdur Rashid, Arooj Rashid, Faisal Khan, Amjad Ali
• Format: Article
• Language: English
• Published: Wiley 2017-07-01
• Series: High Voltage
• Subjects: electric strength; SF(6) insulation; direct current; alternating current; quasiuniform field; dielectric strength; self-recoverability test; synergistic effects; low-temperature environment; dielectric properties; mixed gases; high-voltage application; mixing ratios; SF(6) gas; R12 gas; dichlorodifluoromethane gas; dielectric characteristic
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/hve.2017.0047

In this study, dichlorodifluoromethane (R12) gas and mixtures with nitrogen (N(2)) and air at different pressures and mixing ratios have been investigated and showed good alternative to [inline-formula] gas in terms of high-voltage application. Mixed gases contain R12 gas, they offer good dielectric properties and possibility to be used in low-temperature environment. Synergistic effects and self-recoverability test have been performed. Dielectric strength under quasi-uniform field showed in the order of [inline-formula] air in alternating current (AC), direct current (DC) and impulse was examined. Mixture R12/N(2) (80/20%) could reach over 0.90–0.95 times to that of [inline-formula] gas at 50 lb/in^2 at AC and R12/air (70/30%) gives 0.80–0.90 to [inline-formula] gas. R12 gas presents brilliant self-recoverability. The optimal ratio to switch [inline-formula] gas is R12/N(2) (80/20%) and R12/air (70/30%) is based on the authors’ experimental condition and setup.