Accession Number:

ADA256338

Title:

Microstack Insulator for Flashover Inhibition. Phase 2

Descriptive Note:

Technical rept. 27 Mar 1989-31 Mar 1991

Corporate Author:

TETRA CORP ALBUQUERQUE NM

Personal Author(s):

Report Date:

1992-10-01

Pagination or Media Count:

146.0

Abstract:

The program achieved results that represent a breakthrough in vacuum surface flashover insulation. The samples designed as the optimum configuration failed through the dielectric bulk before surface flashover was observed. In fact the ultimate limitation is the vacuum breakdown of the anode-cathode electrode system. As shown later we determine that for 100-nsec-long pulses the vacuum breakdown voltage of the electrode system was above 350 kVcm, with some pulses as high as 450 kvcm. Typical microstacks will sustain voltages above 280 kvcm, with optimized samples failing typically at average fields above 400 kvcm and not because of surface flashover but through the bulk of the sample. These numbers are excellent considering that the fitted data corresponds to 1 failure out of 15 pulses. The scaling equation from J. C. Martin is used for a 50 probability of failure. The scaling equation produced by the microstack insulator comes from better than 10 6.6 probability of failure, or 94 reliability at the calculated voltage. Insulator, Flashover, Breakdown. Vacuum, Surface,

Subject Categories:

  • Electrical and Electronic Equipment
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE