a high voltage power cable assembly for applying rectangular high voltage pulses to an x - ray tube of an x - ray diagnostic apparatus , including two conducting lines formed of a plurality of stranded or twisted wires covered with insulating layers , two conductors including a plurality of stranded or twisted wires arranged in opposition to a contact point of the conduct lines , the conductors having opposite ends connected to each other , a semi - conductive layer enclosing the conducting lines and the conductors , an insulating layer covering the semi - conductive layer , a shield layer covering the insulating layer , and a sheath wrapping the shield layer .