BS 5691-1:1995
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Guide for the determination of thermal endurance properties of electrical insulating materials General guidelines for ageing procedures and evaluation of test results
Hardcopy , PDF
03-06-2002
English
11-15-1995
Committees responsible
National foreword
Foreword
Introduction
Section one. General
1 Scope
2 General considerations
3 Principles of evaluation and difinitions
4 Selection of test procedures - General guidelines
Section two. Experimental procedures
5 Selection of end-points
6 Preparation of test specimens
7 Establishment of initial property value and number
of test specimens
8 Exposure temperatures and times
9 Ageing ovens
10 Environmental conditioning
11 Procedure
Section three. Evaluation
12 Analysis of test results and determination of thermal
endurance characteristics
13 Treatment and presentation of test data which fail to
satisfy the statistical requirements
14 Test report
Appendices
A Notes on mechanisms of thermal degradation
B The halving interval
C Dispersion and non-linearity
D The thermal endurance profile (TEP)
Table
I Suggested exposure temperatures and times
Figures
1 Determination of the time to reach the end-point
criterion at each temperature. Property variation
2 Thermal endurance graph. T1: Temperature index. HIC:
Halving interval
3 Thermal endurance graph. RTI: Relative temperature
index. HIC (A): Halving interval
Annex
ZA (normative) Other international publications quoted
in this standard with the references of the relevant
European publications
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