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Influence of partial discharges on properties of the polypropylene film in different insulation arrangements

In electrical insulation arrangements such as in high voltage capacitors [3] or cables, consisting only of synthetic films (e.g. polypropylene and polystyrene), the problem of proportionate spread of oil in the entire insulation has been observed. With the cable insulation in service, local drying of oil in the insulation has occurred. Thus resulting in the failure of the insulation.