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A study about the influence of joint use of nanosilica and ATH as fillers on room temperature vulcanized silicone rubber used in the outdoor insulation is carried out. This study is made by comparison between room temperature vulcanized silicone rubber coating with nanosilica and ATH as simultaneous fillers and room temperature vulcanized silicone rubber coating with nanosilica and ATH as independents fillers. The parameters of this comparison are: erosion resistance, circulation of leakage currents under salt fog conditions and hydrophobicity loss. The results of this work show a better development of room temperature vulcanized silicone rubber coating with nanosilica and ATH as simultaneous fillers than room temperature vulcanized silicone rubber coating with nanosilica and ATH as independents fillers., En el presente trabajo se realiza un estudio sobre la influencia que tiene el uso conjunto de la nanosílice y la ATH como cargas en la goma de silicona vulcanizada a temperatura ambiente que se emplea actualmente en el aislamiento externo para cubrir aisladores de porcelana o vidrio. Este estudio se realiza comparando recubrimientos de silicona vulcanizada a temperatura ambiente que contienen como cargas conjuntamente nanosílice y ATH con otros recubrimientos que contienen estas cargas de manera independiente. Dicha comparación se realiza en cuanto a la resistencia a la erosión, la limitación de las corrientes de fuga en condiciones de niebla salina y la pérdida y recuperación de la hidrofobicidad. Los resultados de este trabajo muestran un mejor desempeño de los recubrimientos que contienen conjuntamente como cargas la nanosílice y la ATH que los recubrimientos que las contienen de manera independiente.

A study about the influence of joint use of nanosilica and ATH as fillers on room temperature vulcanized silicone rubber used in the outdoor insulation is carried out. This study is made by comparison between room temperature vulcanized silicone rubber coating with nanosilica and ATH as simultaneous fillers and room temperature vulcanized silicone rubber coating with nanosilica and ATH as independents fillers. The parameters of this comparison are: erosion resistance, circulation of leakage currents under salt fog conditions and hydrophobicity loss. The results of this work show a better development of room temperature vulcanized silicone rubber coating with nanosilica and ATH as simultaneous fillers than room temperature vulcanized silicone rubber coating with nanosilica and ATH as independents fillers., En el presente trabajo se realiza un estudio sobre la influencia que tiene el uso conjunto de la nanosílice y la ATH como cargas en la goma de silicona vulcanizada a temperatura ambiente que se emplea actualmente en el aislamiento externo para cubrir aisladores de porcelana o vidrio. Este estudio se realiza comparando recubrimientos de silicona vulcanizada a temperatura ambiente que contienen como cargas conjuntamente nanosílice y ATH con otros recubrimientos que contienen estas cargas de manera independiente. Dicha comparación se realiza en cuanto a la resistencia a la erosión, la limitación de las corrientes de fuga en condiciones de niebla salina y la pérdida y recuperación de la hidrofobicidad. Los resultados de este trabajo muestran un mejor desempeño de los recubrimientos que contienen conjuntamente como cargas la nanosílice y la ATH que los recubrimientos que las contienen de manera independiente.

This paper reviews the main contributions of the CIGELE research team to the dynamics of streamer discharges along ice surfaces. These investigations were mainly performed under lightning impulse voltage, in atmospheric air. High-speed streak photography techniques were used to observe the streamers propagating between a rod-plane configuration half-submerged in ice bulk. The dynamics of streamer were investigated as influenced by the voltage characteristics, gap configuration, freezing water conductivity, and surrounding temperature. In addition to ice surface, corona discharge was also studied at insulator surface and at the air gaps between the electrodes in order to assess the role played by ice surface on discharge inception and propagation processes. The paper is not restricted to previously published work but contains a substantial amount of new material with a view to closing some major gaps in the present state of ice surface flashover knowledge.

This paper reviews the main contributions of the CIGELE research team to the dynamics of streamer discharges along ice surfaces. These investigations were mainly performed under lightning impulse voltage, in atmospheric air. High-speed streak photography techniques were used to observe the streamers propagating between a rod-plane configuration half-submerged in ice bulk. The dynamics of streamer were investigated as influenced by the voltage characteristics, gap configuration, freezing water conductivity, and surrounding temperature. In addition to ice surface, corona discharge was also studied at insulator surface and at the air gaps between the electrodes in order to assess the role played by ice surface on discharge inception and propagation processes. The paper is not restricted to previously published work but contains a substantial amount of new material with a view to closing some major gaps in the present state of ice surface flashover knowledge.