An investigation into the effects of partial discharge activity in sulphurhexafluoride gas on liquid insulation
Date
2015-09-09
Authors
Ruffini, Antonio Guido
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Abstract
The purpose of the work presented here was to investigate the affects
of SPg gas present in insulating liquids. This research was carried
out mainly by means of experimental work. Investigations involving
the gas evolving or absorbing properties of air and SFg saturated
ins;'ating liquids were carried out. These tests showed that the
liquids investigated (transformer oil and silicone liquid) were
capable of absorbing large amounts of SFg. Further experiments were
performed to discover what influence this would have on stressed,
enclosed liquid samples with air gaps above them. In addition to
this, partial discharges in gas bubbles trapped behind paper
insulation were investigated under high voltage stresses. These
comparative experiments were done using SFg and N; bubbles. The
results obtained have provided evidence that SFg present in liquid
insulation is not deleterious to the insulation when compared with
the presence of non electronegative gasses.
Description
A dissertation submitted to the Faculty of Engineering, University
of the Witwatersrand, Johannesburg, in fulfilment of the
requirements for the degree of Master of Science in Engineering
Johannesburg 1992