tender for condition assessment of transformer oil at cpp, hwp ( manuguru ) ; transformer insulating oil in service testingas per specification :is:1866 – 2017 ( or its latest revision ) 1 ) clause 7.1 appearance2 ) clause 7.2 breakdown voltage3 ) clause 7.3 water content4 ) clause 7.4 neutralization value 5 ) clause 7.5 sediment & sludge6 ) clause 7.6.1 dielectric dissipation factor ( tan delta ) at ambient temperature and 90° c 7 ) clause 7.6.2 specific resistance at ambient temperature and 90° c8 ) clause 7.7 interfacial tension at 27° c9 ) clause 7.9 flash point sample collection and report submission is in the scope of the testing agency