NBN EN 61858 : 2009
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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ELECTRICAL INSULATION SYSTEMS - THERMAL EVALUATION OF MODIFICATIONS TO AN ESTABLISHED WIRE-WOUND EIS
01-06-2014
12-01-2013
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General considerations
5 Evaluation of the change of thickness of an EIM
5.1 Samples
5.2 Acceptance
6 Substitution of winding wire
6.1 General
6.2 Substitution of enamel
6.3 Substitution of conductor material
6.4 Alternate winding wire
7 Substitution of impregnating resin/varnish
7.1 Thermal class determination
7.2 Evaluation
7.2.1 Thermal classes equal or better
7.2.2 One thermal class lower
7.2.3 Other criteria
8 Substitution of other EIMs
8.1 Technically equivalent materials
8.2 Previous evaluation
8.3 Other
9 Evaluation of additions
9.1 Addition of an impregnating resin/varnish
9.2 Addition of other components
10 Single-point thermal ageing test
10.1 Test objects
10.2 Establishing the relative thermal index (RTI)
10.3 Interpretation of results
Annex A (normative) Classes of winding wire
Annex ZA (normative) Normative references to international
publications with their corresponding
European publications
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