Abstract
The normalized Townsend first ionization coefficient α/N and normalized attachment coefficient η/N in pure C4F7N were measured by using the steady-state Townsend (SST) method for a range of reduced electric fields E/N from 750 to 1150 Td at room temperature (20 °C). Meanwhile, the effective ionization coefficients are obtained. All SST experimental results show good agreement with pulsed Townsend (PT) experiment results. Comparisons of the critical electric fields of C4F7N with SF6 and other alternative gases such as c-C4F8 and CF3I indicate that C4F7N has a better insulation performance with a much higher normalized critical electric field at 959.19 Td.
Highlights
As is well known, sulfur hexafluoride (SF6 ), with a good insulation performance and thermal stability, is widely used as an insulation gas and arc quenching medium in many fields such as high-voltage engineering and electrical power applications [1,2]
In order to slow down global warming, searching for an environment-friendly insulation gas to reduce the use of SF6 is of great importance
C4 F7 N gas has a good insulation performance, because of its high boiling temperature, it has to be mixed with other buffer gases such as CO2 to adapt to the operating conditions under high gas pressure [11]
Summary
Sulfur hexafluoride (SF6 ), with a good insulation performance and thermal stability, is widely used as an insulation gas and arc quenching medium in many fields such as high-voltage engineering and electrical power applications [1,2]. There has been some research about the discharge characteristics of c-C4 F8 [4,5,6] and CF3 I [7,8,9], which have been thought of as potential alternative gases to SF6. As another newly potential substitutional insulation gas of SF6 , fluoronitriles (C4 F7 N, known as 3M Novec-4710), which have a GWP value of 2100, have been designed and have attracted great attention [10]. It is worthy to obtain the basic electron swarms of C4 F7 N, such as the ionization coefficient α and attachment coefficient η, which can be used to evaluate the insulation performance of gases [12]
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