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Rozwój wyładowań elektrycznych w estrach biodegradowalnych przy napięciu udarowym w układzie z przegrodą izolacyjną

Stanek M.

Przegląd Elektrotechniczny

2018

R. 94, nr 10

45--48

W artykule przedstawione zostały wyniki badań eksperymentalnych, dotyczących rozwoju wyładowań elektrycznych w estrach biodegradowalnych, w układzie elektrod ostrze kula z przegrodą izolacyjną. Badaniom poddano pięć cieczy izolacyjnych: dwa estry syntetyczne, ester naturalny, ester mieszany o obniżonej lepkości i olej mineralny, jako ciecz odniesienia. Wyniki zawierają porównanie przebiegów światła rejestrowanych za pomocą fotopowielacza i pomiarów wartości progowej napięcia, do rozpoczęcia rozwoju streamera poniżej bariery izolacyjnej.

Article presents the results of experimental studies of streamer propagation in biodegradable dielectric esters liquids in a point-to-sphere electrode system with insulating barrier placed between them. The studies based on five insulating liquids: two synthetic esters, natural ester, low viscosity blended ester and mineral oil as a reference liquid. The measurements results consider comparison of light waveforms registered using photomultiplier technique, as well as the threshold value of voltage for streamer inception below the insulating barrier used.

Streamer propagation in a non-uniform electric field under lightning impulse in short gaps insulated with natural ester and mineral oil

Rozga P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2016

Vol. 64, nr 1

171--179

This article describes the comparative experimental studies on streamer propagation in natural ester and mineral oil under a high voltage lightning impulse. These studies were concentrated around the small electrode gaps and the point-plane electrode arrangement. The spatial shapes of the developing streamers, light emission and propagation velocity were analyzed and compared between the two different dielectric liquids. In both of them two streamer propagation modes were registered during the studies performed. Propagation of slow 2nd mode streamers took place below the so-called acceleration voltage while fast 3rd mode streamers developed at acceleration voltage and above. Comparing the streamer shapes corresponding to a given voltage polarity, no visible differences were observed between the liquids tested. Concerning the light emission, higher frequencies of light pulses were registered however in the case of natural ester. The significant differences between both liquids were noticed in the value of the acceleration voltage estimated. In the case of positive polarity streamers started to develop in natural ester as a 3rd mode at lower value of testing voltage than in the case of mineral oil. For negative polarity, within the applied testing voltages, 3rd mode streamers appeared only in natural ester. On this basis, the fundamental conclusion is that natural ester may have a lower ability of preventing the development of fast and energetic 3rd mode streamers, even at small electrode gaps.