BS EN 62770:2014
$102.76
Fluids for electrotechnical applications. Unused natural esters for transformers and similar electrical equipment
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 22 |
IEC 62770:2013 describes specifications and test methods for unused natural esters in transformers and similar oil-impregnated electrical equipment in which a liquid is required as an insulating and heat transfer medium. Natural esters with additives are within the scope of this standard. Because of their different chemical composition, natural esters differ from insulating mineral oils and other insulating fluids that have high fire points, such as synthetic esters or silicone fluids. Natural, ester-derived insulating fluids with low viscosity have been introduced but are not covered by this standard. Pertinent properties of such fluids are given in Annex B. This standard is applicable only to unused natural esters. Reclaimed natural esters and natural esters blended with non-natural esters fluids are beyond the scope of this standard.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | English CONTENTS |
| 9 | INTRODUCTION |
| 10 | 1 Scope 2 Normative references |
| 12 | 3 Terms and definitions 4 Properties, their significance and test methods 4.1 General 4.2 Physical properties 4.2.1 Appearance |
| 13 | 4.2.2 Viscosity 4.2.3 Pour point 4.2.4 Water content 4.2.5 Density 4.3 Electrical properties 4.3.1 Breakdown voltage 4.3.2 Dielectric dissipation factor (DDF) |
| 14 | 4.3.3 Relative permittivity (dielectric constant) 4.4 Chemical properties 4.4.1 Acidity 4.4.2 Corrosive sulfur 4.4.3 Additive content 4.4.4 Furfural content 4.5 Performance 4.5.1 Oxidation stability |
| 15 | 4.5.2 Total acidity 4.5.3 Viscosity 4.5.4 Dielectric dissipation factor (DDF) 4.6 Health, safety and environmental (HSE) properties 4.6.1 Fire point and flash point 4.6.2 Polychlorinated biphenyls (PCBs) 4.6.3 Biodegradation 4.6.4 Toxicity 5 Classification, identification, general delivery requirements and sampling 5.1 Classification |
| 16 | 5.2 Identification and general delivery requirements 5.3 Sampling |
| 17 | Tables Table 1 – General specifications |
| 18 | Annex A (normative) Summary of the test method for evaluating oxidation stability of unused natural esters A.1 Introductory remark A.2 Test conditions A.3 Precision A.4 Relative repeatability (r) A.5 Relative reproducibility (R) Table A.1 – Relative repeatability and relative reproducibility obtained for different parameters during RRT |
| 19 | Annex B (informative) Specifications of low-viscosity insulating fluids derived from natural esters Table B.1 – Specifications for low-viscosity of monoesters derived from natural esters |
| 20 | Bibliography |
