Voltage-Current Characteristic of Free Burning Arcs in SF6 Alternative Gas Mixtures
OPEN ACCESS
Loading...
Author / Producer
Date
2022-11
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
OPEN ACCESS
Data
Rights / License
Abstract
Voltage-current characteristics of free burning arcs
in SF6 and air have been known for decades. As the demand for
an SF6-free solution is increasing, there is an accompanying need
to determine arc parameters in the alternative gases. An unblown
arc experiment has been established to determine the voltagecurrent
characteristics of SF6 alternative gases, which have not
yet been thoroughly studied. In this experiment free burning
arc measurements were performed in a number of gases under
consideration of SF6 alternatives, including CO2 and mixtures
of CO2 /O2 with and without C4F7N or C5F10O additives at
concentrations of up to 10 %. Measurements were also performed
in air and SF6 for comparison. Arc voltage was measured in
each gas at pressures ranging from 1 bar to 5 bar absolute, and
electrode separations ranging from 20mm to 95 mm. Voltagecurrent
characteristic measurements for air and SF6 show good
agreement with previously published results. A linear relationship
of the arc voltage to the arc length is shown, as well as fourth root
dependence of the arc voltage on the gas pressure. It was shown
that neither the O2 nor the fluorinated additives to CO2 have any
significant influence on the voltage-current characteristic. The
minimum arc voltage in all measured gases was slightly higher
than in SF6, but the arc in SF6 was the least stable and had
the highest elongations resulting in high voltage peaks. The arc
voltage in air had a similar minimum value to the CO2 based
gases, but the arc was much more stable, resulting in lower
effective voltage, especially at low currents.
Permanent link
Publication status
published
External links
Editor
Book title
Journal / series
Volume
50 (11)
Pages / Article No.
4744 - 4752
Publisher
IEEE
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Arc discharges; gas insulation; sulfur hexafluoride; switchgear
Organisational unit
03869 - Franck, Christian / Franck, Christian