BS EN 61203:1995

Committees responsible
National foreword
Foreword
1. Scope
2. Normative references
3. Tests and their significance
3.1 Colour and appearance
3.2 Density
3.3 Kinematic viscosity
3.4 Flash point - Fire point
3.5 Water content
3.6 Neutralization value
3.7 Breakdown voltage
3.8 D.C. resistivity
3.9 Dielectric dissipation factor
3.10 Diagnosis by gas analysis (IEC 567 and IEC 599)
4. Frequency of examination of liquids in service
5. Sampling
6. Testing procedures
6.1 Field screening tests
6.2 Laboratory tests
7. Classification of esters in service
8. Treatment of ester liquids in group 2
8.1 Vacuum treatment and filtration
8.2 Molecular sieve and filtration
9. Materials used for maintenance equipment
Annex ZA (normative) Other international publications
quoted in this standard with the references of the
relevant European publications

Applicable to esters orginally complying with the requirements of BS EN 61099

This International Standard is a guide to the maintenance of synthetic organic esters, originally complying with the requirements of IEC 1099, in transformers with rated voltages up to 35 kV. It is intended to assist the equipment operator in assessing the quality of the liquid during use in the equipment and maintaining it in a serviceable condition.

Methods for reconditioning ester transformer liquid are outlined.

This standard deals only with ester liquid used in equipment where liquid sampling is practicable and which has not previously been filled with any other liquid.