Progressively-censored aging tests on XLPE-insulated cable models

Author

Montanari, Gian Carlo ; Cacciari, Mario

Author_Institution

Istituto di Elettrotecnica Ind., Bologna Univ., Italy

Volume

23

Issue

3

fYear

1988

fDate

6/1/1988 12:00:00 AM

Firstpage

365

Lastpage

372

Abstract

The problem of evaluating the time-to-failure percentiles in progressively-censored tests on solid insulating materials is addressed. Statistical methods to estimate the parameters of the Weibull distribution (and their confidence limits) are examined on the basis of the results of aging with combined thermal-electrical stresses carried out on XLPE insulated cable models. These tests are performed at the same stresses on samples more than 1 m long and subjected to progressive censoring of aging times, or on short specimens about 20 cm long and subjected to complete, or singly-censored, life tests. This procedure allows the effectiveness of progressively-censored tests in estimating life percentiles to be verified, and the accuracy of the methods to be compared

Keywords

ageing; cable insulation; insulation testing; life testing; organic insulating materials; polymers; statistical analysis; Weibull distribution; XLPE-insulated cable models; aging tests; combined thermal-electrical stresses; confidence limits; life tests; progressively-censored tests; statistical methods; time-to-failure percentiles; Aging; Life testing; Materials testing; Parameter estimation; Power cable insulation; Power cables; Solids; Statistical analysis; Thermal stresses; Weibull distribution;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.2376

Filename

2376