Natural rubber electrical conduction mechanism under high and low electrical field

Abstract

The services in energized line become each more indispensable time and its efficiency depends on the electrician worker who executes this activity. The efficiency of the work passes for the security of the worker, who is protected by tools such as gloves, sleeves, blankets, flexible coverings among others manufactured in natural rubber. The use, storage and maintenance of these tools guarantee the principle the quality and durability of the material, since that its conformation takes care of certain criteria. However is observed that good tools of these materials disapproved when received from manufactures, or when they are removed of the warehouse for replace. This work the experimental results obtained of ageing in temperature of 100/spl deg/C for times the 48, 70 and 312 h, although applying DC electrical tension in samples and measuring leakage current are presented. The measurements in samples were carried out through on samples prepared from the deformulated of commercial materials and respective reformulated in thin films. The obtained results showed to the mechanisms of conduction of the samples in low high e electric field, also identifying the electric tension transition showing that in low fields it prevails to the Ohm law conduction and in high electric fields it is had conduction space charge limited current (SCLC). These results can support the natural rubber formulation process having main objective to reduce the mechanisms that occur high conduction current in high electric fields, which lead the material to dielectric breakdown. Raw natural rubber in Brazil is cropped in rubber tree (Hevea brasiliensis) farm in Sao Paulo State through using new plantation technology in smaller spaces, spaced in few meters between trees. In Amazon forest rubber tree is found naturally and its spacing may be a hundreds meters to kilometers between trees. It's necessary to research this raw material from different internationally standard clones to characterize dielectric and electric properties for industrial applications. Moreover this natural material has a low commercial price compared with synthetic and no necessary to build expensive and dangerous chemical plants.