Abstract
This paper presents our new experimental facility and techniques to measure ac loss and current distribution between the layers for High Temperature Superconducting (HTS) cables. The facility is powered with a 45 kVA three-phase power supply which can provide three-phase currents up to 5 kA per phase via high current transformers. The system is suitable for measurements at any frequency between 20 and 500 Hz to better understand the ac loss mechanisms in HTS cables. In this paper, we will report techniques and results for ac loss measurements carried out on several HTS cables with and without an HTS shielding layer. For cables without a shielding layer, care must be taken to control the effect of the magnetic fields from return currents on loss measurements. The waveform of the axial magnetic field was also measured by a small pick-up coil placed inside a two-layer cable. The temporal current distribution between the layers can be calculated from the waveform of the axial field.
| Original language | English |
|---|---|
| Article number | 5635359 |
| Pages (from-to) | 996-1000 |
| Number of pages | 5 |
| Journal | IEEE Transactions on Applied Superconductivity |
| Volume | 21 |
| Issue number | 3 PART 2 |
| DOIs | |
| State | Published - Jun 2011 |
Funding
Manuscript received August 02, 2010; accepted October 03, 2010. Date of publication November 15, 2010; date of current version May 27, 2011. This work was supported by the US Department of Energy, Office of Electricity Delivery and Energy Reliability.
| Funders | Funder number |
|---|---|
| US Department of Energy | |
| Office of Electricity Delivery and Energy Reliability |
Keywords
- AC loss measurement
- Axial magnetic field
- Current distribution
- Superconducting cable