Electrical insulating materials and systems - A.C. voltage endurance evaluation

Published date

26-02-2016

Publisher

European Committee for Standards - Electrical

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

IEC 61251:2015 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 20 Hz to 1 000 Hz. 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. This first edition of IEC 61251 cancels and replaces the second edition of IEC TS 61251, published in 2008. This edition constitutes a technical revision and includes the following significant technical changes with respect to the second edition of IEC TS 61251:a) upgrade from Technical Specification to an International Standard;b) clarification of issues raised since publication of IEC TS 61251.

Committee	CLC/SR 112
DocumentType	Standard
PublisherName	European Committee for Standards - Electrical
Status	Current

Standards	Relationship
IEC 61251:2015	Identical
NF EN 61251 : 2016	Identical
NBN EN 61251 : 2016	Identical
NEN EN IEC 61251 : 2016	Identical
I.S. EN 61251:2016	Identical
PN EN 61251 : 2016	Identical
SN EN 61251:2016	Identical
DIN EN 61251 : 2016	Identical
VDE 0303-251 : 2016	Identical
UNE-EN 61251:2016	Identical
BS EN 61251:2016	Identical
CEI EN 61251 : 2016	Identical

IEC 60243-1:2013	Electric strength of insulating materials - Test methods - Part 1: Tests at power frequencies
EN 60243-3:2014	Electric strength of insulating materials - Test methods - Part 3: Additional requirements for 1,2/50 µs impulse tests
IEC 61649:2008	Weibull analysis
EN 60343:1992	Recommended test methods for determining the relative resistance of insulating materials to breakdown by surface discharges
IEC 60343:1991	Recommended test methods for determining the relative resistance of insulating materials to breakdown by surface discharges
EN 61649:2008	Weibull analysis
IEC 60243-3:2013	Electric strength of insulating materials - Test methods - Part 3: Additional requirements for 1,2/50 µs impulse tests
EN 60243-1:2013	ELECTRIC STRENGTH OF INSULATING MATERIALS - TEST METHODS - PART 1: TESTS AT POWER FREQUENCIES (IEC 60243-1:2013)
IEC 60243-2:2013	Electric strength of insulating materials - Test methods - Part 2: Additional requirements for tests using direct voltage
IEC 62539:2007	Guide for the statistical analysis of electrical insulation breakdown data
EN 60243-2:2014	Electric strength of insulating materials - Test methods - Part 2: Additional requirements for tests using direct voltage