Measurement and research of electrical properties of new insulating material of pipeline transmission

In order to meet the requirements of UHV transmission and ultra-large capacity, Safety and reliability, developing a new type of high voltage and low cost insulation material has been the key problem in the development of UHV transmission equipment. In this paper, the dielectric properties of a new polymer cement concrete insulation material have been studied. The component and the manufacture process of PCC insulations have been optimized and the samples have been made. Breakdown test, volume resistivity, dielectric spectroscopy and space charge measurement have been used to study its dielectric properties. As shown in the test results, the breakdown strength of the PCC insulations can reach up to 11 kV/mm, its volume resistivity is around 10
¹²
Ω·cm. Its permittivity decreases with the frequency and the dielectric loss can reach a peak value upon 1 Hz and then starts to decrease. As seen from the space charge measurement results, homocharge can be found in the vicinity of the electrode and heterocharge accumulates in the middle region and the total amount of the accumulated charge increases with time.