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Electrical field sketching at the cable terminals is carried out theoretically by the aids of computer programs. The results give an indication of the maximum stresses occurs in the cables insulation at the terminals and the maximum longitudinal stresses along the cables screen at outer surface of the XLPE insulation. The results show that maximum stress occurred by lightning impulse is found much higher than that of switching operation but the later has longer period. And both are found depends on the polarity of the over voltages and the polarity of the (power/frequency) voltages.

The Effect of the Over Voltage on the Stress Distribution at the Terminals of H.V. XLPE Cables