BS EN 61251:2016

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Voltage endurance
5 Test methods
6 Evaluation of voltage endurance
Annex A (informative) - The Weibull distribution
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Defines many of the factors involved in voltage endurance tests on electrical insulating materials and systems.

This International Standard describes many of the factors involved in voltage endurance tests on electrical insulating materials and systems. It describes the voltage endurance graph, lists test methods illustrating their limitations and gives guidance for evaluating the sinusoidal a.c. voltage endurance of insulating materials and systems from the results of the tests. This International Standard is applicable over the voltage frequency range 20Hz to 1000Hz. The general principles can also be applicable to other voltage shapes, including impulse voltages. The terminology to be used in voltage endurance is defined and explained.