BS EN 60422:2006 Mineral insulating oils in electrical equipment. Supervision and maintenance guidance
BS EN 60422 gives guidance on the supervision and maintenance of the quality of the insulating oil in electrical equipment.
BS EN 60422 applies to mineral insulating oils, originally supplied conforming to BS IEC 60296, and used in transformers, switchgear and other electrical apparatus where oil sampling is reasonably practicable and where the normal operating conditions specified in the equipment specifications apply.
BS EN 60422 assists the power equipment operator to evaluate the condition of the oil and maintain it in a serviceable condition. It also provides a common basis for the preparation of more specific and complete local codes of practice.
BS EN 60422 includes recommendations on tests and evaluation procedures and outlines methods for reconditioning and reclaiming oil and the decontamination of oil contaminated with PCB.
The condition monitoring of electrical equipment, for example by analysis of dissolved gases, furanic compounds or other means is outside the scope of this standard.
Contents of BS EN 60422:
- Introduction
- Scope
- Normative references
- Terms and definitions
- General remarks
- General caution
- Environment
- Properties and deterioration/degradation of oil
- Oil tests and their significance
- General
- Colour and appearance
- Breakdown voltage
- Water content
- Acidity
- Dielectric Dissipation Factor (DDF) and resistivity
- Inhibitor content and oxidation stability
- Sediment and sludgeInterfacial tension (IFT)
- Particle count
- Flash-point
- Compatibility of insulating oils
- Pour-point
- Density
- Viscosity
- Polychlorinated biphenyls (PCBs)
- Corrosive sulphur
- Sampling of oil from equipment
- Categories of equipment
- Evaluation of mineral insulating oil in new equipment
- Evaluation of oil in service
- General
- Frequency of examination of oils in service
- Testing procedures
- Classification of the condition of oils in service
- Corrective action
- Handling and storage
- Treatment
- General
- Reconditioning
- Reclaiming
- Decontamination of oils containing PCB
- Replacement of oil in electrical equipment
- Replacement of oil in transformers rated below 72,5 kV and in switchgear and associated
- equipment
- Replacement of oil in transformers rated 72,5 kV and above
- Replacement of oil in electrical equipment contaminated with PCB
- Sampling temperature below 20 ºC
- Particles
- Test method for determination of sediment and sludge
- Bibliography
