The Assessment of Mildly Aged XLPE Insulation using Polarization – Depolarization Current measurement
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Abstract
Insulation systems used in the power system have to interact with the environment, which leads to its ageing and, eventually, failure. Cross – Linked Polyethylene (XLPE) insulation of underground cables is a vital component of the power system. Condition of XLPE underground cable insulation has a significant impact on the reliablity and economical operation of the electrical power grid. Several techniques have been in use for the condition assessment of underground cables. Polarisation and Depolarisation Current (PDC) measurement method has been commonly used to assess moisture and the ageing condition of the underground cable insulation system. In this work, dielectric response of XLPE samples, aged under different humidity and temperature conditions are investigated. The PDC measurement is carried out on unaged and aged samples. The XLPE samples are aged under constant stress and cyclic stress. The PDC measured data are used to estimate Degradation Index and Loss Factor. The depolarization characteristics obtained from PDC measurement, is further processed to obtain equivalent electrical circuit parameters i.e. resistance and capacitance of XLPE insulation based on Extended Debye Model. Using Model parameters, dissipation factor and ageing factor are estimated under different ageing conditions.
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