Conductivity Measurement and Interpretation in Dibenzyltoluene at High Temperature and High Electric Field

This paper presents a study of the electrical conduction of dibenzyltoluene liquid (Jarytherm® DBT) for a wide range of electric field up to 30kV/mm, and temperature up to 300°C. The measurement is carried out in a high voltage and high temperature test cell with plane-plane electrode system. The conduction current is measured with applied dc voltage up to 10 kV/mm, and impulse voltage up to 30kV/mm. It is observed that conductivity of DBT is highly dependent on temperature and electric field. Results are interpreted in terms of ion dissociation mechanism, mobility increase with temperature and injection mechanism at high field.