PROJECT TITLE :

Effect of cellulose particles on impulse breakdown in ester transformer liquids in uniform electric fields

ABSTRACT:

This paper presents experimental studies on the effect of cellulose particles on breakdown voltages and breakdown mechanisms of a synthetic ester and a natural ester underneath normal lightning impulse voltages. A mineral oil was additionally tested and used because the benchmark. In total, liquids with four particle contamination levels, i.e. low, traditional, marginal and high; 2 moisture levels, i.e. dry and wet conditions, and 3 types of electrodes, i.e. plane-plane, rod-rod, and VDE electrodes were investigated. Results showed that the presence of cellulose particles reduces the fiftyp.c breakdown voltages of the ester liquids and also the mineral oil in uniform fields, which is further enhanced when the particle is combined with the moisture. The particle effect on breakdown voltages conjointly becomes more outstanding when the effective stressed area/volume of the electrode configurations is increased. Nevertheless, at the same conditions, fiftyp.c lightning impulse breakdown voltages of the ester liquids are always like that of the mineral oil. Linking with previously printed results below AC voltages, it's summarised that the particle impact on liquid breakdown is related to the effective stressed space, the duration of electric stress and therefore the viscosity of the liquid itself. Still, the streamer imaging tests revealed that the detrimental result of cellulose particles on breakdowns in liquids is because of the promotion on streamer initiations rather than on streamer propagations.This paper presents experimental studies on the effect of cellulose particles on breakdown voltages and breakdown mechanisms of a synthetic ester and a natural ester underneath customary lightning impulse voltages. A mineral oil was also tested and used because the benchmark. In total, liquids with four particle contamination levels, i.e. low, normal, marginal and high; 2 moisture levels, i.e. dry and wet conditions, and 3 varieties of electrodes, i.e. plane-plane, rod-rod, and VDE electrodes were investigated- Results showed that the presence of cellulose particles reduces the 50% breakdown voltages of the ester liquids and also the mineral oil in uniform fields, which is further enhanced when the particle is combined with the moisture. The particle result on breakdown voltages conjointly becomes more prominent when the effective stressed area/volume of the electrode configurations is increased. Nevertheless, at the same conditions, 50% lightning impulse breakdown voltages of the ester liquids are invariably reminiscent of that of the mineral oil. Linking with previously published results underneath AC voltages, it is summarised that the particle result on liquid breakdown is associated with the effective stressed space, the duration of electric stress and therefore the viscosity of the liquid itself. Still, the streamer imaging tests revealed that the detrimental result of cellulose particles on breakdowns in liquids is due to the promotion on streamer initiations rather than on streamer propagations.


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