Title :
Dynamic breakdown characteristics of liquid helium induced by a quench of superconducting wire and coil
Author :
Okubo, H. ; Wakita, M. ; Chigusa, S. ; Hayakawa, N. ; Hikita, M.
Author_Institution :
Dept. of Electr. Eng., Nagoya Univ., Japan
fDate :
2/1/1997 12:00:00 AM
Abstract :
For practical insulation design of superconducting power apparatus, it is necessary to take into account an inherent phenomenon known as quench, the transition from the superconducting to the normal state. We investigated quench-induced dynamic breakdown and prebreakdown characteristics of liquid helium (LHe). Experimental results revealed that the quench of the superconductor drastically reduced the breakdown voltage of LHe in the thermal bubble disturbance. Moreover, dynamic breakdown characteristics in a quasi-uniform field using a superconducting coil were investigated. The results revealed that the breakdown was induced in the quench-initiated region where the largest thermal energy was generated
Keywords :
dielectric liquids; electric breakdown; liquid helium; machine insulation; partial discharges; quenching (thermal); superconducting coils; superconducting machines; He; breakdown voltage; dynamic breakdown characteristics; liquid He; partial discharges; prebreakdown characteristics; quasi-uniform field; quench; superconducting coil; superconducting power apparatus insulation design; superconducting to normal state transition; superconducting wire; thermal bubble disturbance; thermal energy generation; Cryogenics; Dielectric liquids; Electric breakdown; Electrodes; Helium; Superconducting cables; Superconducting coils; Superconducting filaments and wires; Superconducting integrated circuits; Thermal quenching;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
