Space charge evolution in XLPE cable insulation under high electricfields

摘要

The authors improved the conventional pulse electro-acousticmethod to measure the space charge evolution in XLPE cable insulationwith applying very high voltage. Using this technique, the space chargedistribution was measured applying an electric field of over 1 MV/cm to3-mm thick XLPE cable insulation. Under high fields, positive chargepackets appeared intermittently in the vicinity of the anode and movedtowards the cathode. This behavior is supposed to be affected by thechange in temperature and material composition. This report deals withthe results of space charge measurement at different temperatures, aswell as with different material compositions