Automated HiPot setup We use Bertan 5 k

Automated Hi-Pot setup We use Bertan 5 k. V power supply interfaced with NI DAQ / Labview control to ramp up voltage and measure leakage current • Voltage step, ramp rate and averages control • Storing data and graphs • Ability to monitor the test and stop manually, in addition to auto trip. • Typically we ramp up at 0. 5 or 1 V increments, at 2 -4 V/s • We normally choose current range of 1 m. A • Current is monitored and power supply automatically “trips” at ~80% of the current range, i. e. at 0. 8 m. A. 10/26/2010 1

IV curves examples Coil 12 to (PHA 01+PHA 02) Coil 11 to all PHs Initial current offset (due to the measurement system) is subtracted prior to the voltage ramp. The remaining offset is proportional to d. V/dt and capacitance of the pair(s) being tested, as I=d. Q/dt=C d. U/dt 10/26/2010 2

Hi. Pot - Coil 1 Coil PHA 01 849/893/ (615; 731)/ 1000 PHA 02 903/957/ (675; 993)/ 1000 PHB 01 725/ 721/8. 6 k. W/ 1000 PHB 02 784/ 772/5. 4 MW/ 1000 LE IL Endshoe 901/ 878/4251/ 1000 LE OL Endshoe 740/ 741/6. 5 W/ 1000 RE IL Endshoe 1000/598/ 1000 RE OL Endshoe 1000/621/ 1000 Shell -/1000/595/ 1000 Coil on the table / Magnet, Azimuthal / Magnet, Full Load/TARGET PHA 02 (1) Manual stop; (2) As follows from Coil-to-LE IL Endshoe result PHB 01 PHs measured after “pizza box” is assembled: (Coil-to-PH; PH-to-Coil) PHB 02 LE IL Endshoe 500/500/ 500 LE OL Endshoe 500/500/ 500 8. 59 k. W/ 8. 17 k. W/ 8. 44 k. W 500/500/ 500 116. 5 k. W/ 121 k. W/ 5. 4 MW 150/ 4061/4252/ 500 RE IL Endshoe RE OL Endshoe 500/500/ 500 500/500/ 500 No hipot/ 4001/ 500 Shell

Hi. Pot - Coil 8 Coil PHA 01 680/1000/ (685; 1000)/ 1000 PHA 02 913/1000/ (679; 1000)/ 1000 PHB 01 1000/ (718; 1000)/ 1000 PHB 02 1000/ (765; 1000)/ 1000 LE IL Endshoe 1000/9091/ 1000 LE OL Endshoe 1000/9091/ 1000 RE IL Endshoe 1000/1000/ 1000 RE OL Endshoe 1000/1000/ 1000 Shell -/1000/835 1000 PHA 02 Coil on the table / Magnet, Azimuthal / Magnet, Full Load/TARGET (1) IL and OL Endshoes connected PHB 01 PHB 02 PHs measured after “pizza box” is assembled: (Coil-to-PH; PH-to-Coil) LE IL Endshoe 500/500/ 500 LE OL Endshoe 500/500/ 500 500/500/ 500/500 500/ 500 RE IL Endshoe RE OL Endshoe 500/500/ 500 500/500 3. 95 k. W/ 5. 1 k. W/ 4. 75 k. W Shell

Hi. Pot - Coil 5 Coil PHA 01 PHA 02 1000/ (754; 1000)/ 1000 PHA 02 1000/ (746; 1000)/ 1000 PHB 01 1000/9172 /(-; 1000)/ 1000 PHB 02 1000/9172/ (-; 854) 1000 LE IL Endshoe 1000/ 1000 LE OL Endshoe 1000/ 1000 RE IL Endshoe 1000/ 1000 RE OL Endshoe 1000/ 1000 Shell -/1000/1000 Coil on the table / Magnet, Azimuthal / Magnet, Full Load/TARGET (1) Current rising PHB 01 (2) PHB 01+PHB 02 (3) All PHs to All Enshoes PHs measured after “pizza box” is assembled: (Coil-to-PH; PH-to-Coil) LE IL Endshoe 500/ 4193/500/5 00 LE OL Endshoe 500/ 4193/500/ 500 500/ 4193/500/5 00 500/ 4193/500/ 500 290/ 5001/ 500 RE IL Endshoe RE OL Endshoe 500/ 4193/500/ 500 No hipot/ 700 k. W/ 7. 2 MW Shell

Coil PHA 01 PHA 02 PHB 01 PHA 02 1000/ (-; 1000)/ 1000 Coil on the table / Magnet, Azimuthal / Magnet, Full Load/TARGET (1) Manual stop PHB 01 1000/1000/ (-; 1000)/ 1000 LE IL Endshoe 1000/ 6501/6581/ 1000 LE OL Endshoe 1000/ 8732/899/ 1000 RE IL Endshoe 1000/9583/ 1000 RE OL Endshoe 1000/9583/ 1000 -/1000/ 999/1000 (2) First Spike at 824 V, manual stop (3) IL and OL connected PHB 02 1000/ (-; 1000)/ 1000 PHB 02 Shell Hi. Pot - Coil 7 LE IL Endshoe 500/500/ 500 LE OL Endshoe 500/500/ 500 500/500/ 500 PHs measured after “pizza box” is assembled: (Coil-to-PH; PH-to-Coil) 500/500/ 500 RE IL Endshoe RE OL Endshoe 500/ 500/500/ 500 Shell

Insulation breakthrough test Sputtered film (Au, Ni. . etc) Hi Pot trace