Effect of Pre-Qualification Test on Space Charge Accumulation Phenomenon

This paper is focused on the measurement of space charge in flat specimens deriving from a cable subjected to the Pre-Qualification (PQ) test. In particular, before starting the PQ test and after finishing them, the flat specimens have been taken from the cable. This with the aim to evaluate the effect of PQ test on the space charge accumulation phenomenon. The PEA cell has been used for the space charge detection, while the Standard IEEE 1732–2017 has been followed for the measurement procedure. For both unaged and aged specimens, the space charge and the related electric field distribution have been reported in the paper. Measurement results highlight that the more accentuated electric field distortion has been observed during the test carried out on the aged specimen stressed under positive polarity.