Characterization of HFO1234ze mixtures with N2 and CO2 for use as gaseous electrical insulation media

Summary

The hydrofluoroolefine HFO1234ze was recently proposed as an environment-friendly gas for use in medium or high voltage electrical insulation. Due to its relatively high boiling (254 K), it should be used as part of a gas mixture. In this work, the electric properties of HFO1234ze mixtures with N2 and CO2 are experimentally characterized using a pulsed Townsend setup. For this purpose, the electric displacement current of electron avalanches in these gas mixtures is recorded and analyzed. The analysis yields the effective ionization rate constant (and in particular the critical electric field), the electron drift velocity and the electron diffusion coefficient. These results are applied to assess the potential of such mixtures for medium and high voltage insulation applications.

Additional informations

Keywords

Gaseous electrical insulation, HFO1234ze, Critical electric field, New materials