A partial discharge detection test link and system is disclosed to detect partial discharge of a power cable accessory. The electrical path from one electrode of the capacitor passes through a first interconnecting line, then through multiple via holes to a second interconnecting line. The intermediate part may include a porous metal such as tantalum. An active pulse-inducing mechanism having a scattering-limited drive generates a consistent pulsatile venous signal utilized for the venous blood measurements. Then, various improvements are made such as tilting front and rear wall surfaces of the blade grooves in a predetermined direction, forming one- and opposite-side blade grooves in a zigzag fashion, forming a guide surface in a communicating passage of a pump housing, and forming communicating holes in an impeller.