Cryogenic power transmission technology: cryogenic dielectrics. Quarterly report, July 1--September 30, 1973
An investigation of the dielectric properties of fluids and solids for use in superconducting systems is underway at the Oak Ridge National Laboratory as part of the AEC program in superconducting power transmission. The investigation initially will encompass ac and dc breakdown and pre-breakdown phenomena in liquid helium and in a variety of solids in liquid helium. Extension to impulse measurements is expected in the near future. A prime objective of the investigation is to determine scaling laws applicable to various models of superconducting cables and other cryogenic apparatus. The experiments are being devised with this objective in mind. Experimental facilities have been set up for ac testing with a series resonant transformer to 700 kV rms and for dc testing to 600 kV. A high-voltage cryostat has been designed for service to l000 kV with provision for optical as well as electrical recording of both breakdown and pre-breakdown phenomena. Other apparatus for testing to lower voltages is also available. Instrumentation for partial discharge measurements by multichannel pulse height analysis, high speed oscilloscope, and bridge detection are available. The influence of electrode surfaces and impurities as well as pressure and temperature on the dielectric properties of liquid helium will be determined. The behavior at large gaps is of particular interest. Breakdown and surface flashover of bulk and laminated solids in liquid helium and in vacuum at liquid helium temperatures are to be included in the investigations. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn. (USA)
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-29-015025
- OSTI ID:
- 4366827
- Report Number(s):
- ORNL-TM-4433
- Resource Relation:
- Other Information: Orig. Receipt Date: 30-JUN-74
- Country of Publication:
- United States
- Language:
- English
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