Triax

The Triax design places the three phase conductors concentrically around a common central core, surrounded by a copper shield. The three superconducting phases and a copper screen are separated by a thin, 15 kV-class, electrical insulation material, Cryoflex™. The compact design gives low impedance, low loss and reduced materials cost. It uses half the quantity of superconducting material needed and reduces the cold surface area, which reduces the critical cooling requirements.

Prior to installation, the Triax design cable was tested by Southwire and nkt, partners in the cable design, at nkt's test rig at the Danish Technical University in Copenhagen, Denmark. The cable was loaded to 3 x 3.0-3.2 kA for more than two hours, and temperatures were monitored inside the cable.

Top of page

 

	Triax
	Cable designs
	RTD design
	3-phase design
	Cooling
	Standard and norms
	Critical current
	Losses
	AC losses
	Overcurrent