Accession Number:

AD0749925

Title:

Statistical analysis of Truncated-Data Method to Shorten Thermal-Aging Tests of Electrical Insulation

Descriptive Note:

Interim rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1972-09-19

Pagination or Media Count:

15.0

Abstract:

The standard tests of insulation materials motorette tests and magnet-wire twist tests call for aging ten specimens until failure at each of three or four temperatures to obtain a life-versus-temperature curve. Valuable time could be saved if an estimate of the life at each temperature is valid from data truncated at fewer than all ten failures. Therefore a statistical analysis was made, using 50 previous thermal evaluations, of the validity of three truncated-data estimates of the life at each temperature the log average of the times for the fifth and sixth failures method A, an estimate from a probability-plot fit to the first five failure times method B, and simply the fifth failure time method C.

Subject Categories:

  • Electrical and Electronic Equipment
  • Miscellaneous Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE