Title :
Pulsed electrical breakdown in liquid helium in the μs range
Author :
Suehiro, J. ; Yamasaki, K. ; Matsuo, H. ; Hara, M. ; Gerhold, J.
Author_Institution :
Fac. of Eng., Kyushu Univ., Fukuoka, Japan
fDate :
6/1/1994 12:00:00 AM
Abstract :
Information about breakdown time-lags under pulsed voltage stress is prerequisite to the insulation design of superconducting devices. Experiments have been carried out using a pulse generator which provides a step voltage with 200 ns rise time and a long decay time constant of more than 1 ms. The present experiments may bridge the information gap between time lag measurements in the ns range using extremely high field strengths, and existing data found with usual lightning impulse voltage. The test device is described in the paper, and some typical results are discussed in detail
Keywords :
cable insulation; cable testing; electric breakdown of liquids; electric strength; insulation testing; liquid helium-4; machine insulation; power cables; superconducting cables; superconducting machines; He; breakdown time-lags; decay time constant; field strength; insulation design; lightning impulse voltage; pulse generator; pulsed electrical breakdown; pulsed voltage stress; rise time; step voltage; superconducting devices; time lag measurements; Breakdown voltage; Bridge circuits; Electric breakdown; Helium; Insulation; Lightning; Pulse generation; Stress; Superconducting devices; Time measurement;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
