Cryogenic Voltage Withstand and Heat Transfer Tests for the General Electric Large Coil Turn Heaters

摘要

The cryogenic hipot tests indicate that undamaged heaters will perform acceptably in the coil. However, the 1050 V dc hi-pot test does not appear adequate to diagnose all flaws. It was decided that during coil production the heaters will be tested with at least 1400 V dc and 400 V ac. Further tests at lower voltages will be performed after the heated conductor section is wound into the coil, with a final test at the layer of 900 V dc or 1.5 times the operating voltage. On the basis of the heat transfer tests, the power supply for the heaters will be specified to provide voltage pulses of up to 1000 V at 60 A for a maximum of 1 sec. (ERA citation 09:021534)