Abstract
BTA (1, 2, 3-benzotriazole) added oil compared with oil without BTA shows following properties.
(1) Resistivity becomes low value
(2) Dielectric loss tangent, tanδ, becomes low value
(3) Absorption coefficient of absorption current becomes low value
Usually, tanδ of the liquid dielectrics is reversely proportional to the resistivity. That is, properties of (1) and (2) are unnatural physically. The reason is due to property of (3).
From experimental results of BTA content dependence of the absorption current, it was found that the absorption current was related to the mobility of the ionic charge carrier, and that the mobility of BTA added oil was lower than that of the oil without BTA. The reason for the slow mobility is considered on existence of the large ionic charge carrier which consists of BTA and original ion in the insulating oil.
Here reports about chance of the existence of the large ionic charge carrier.
