Dielectric strength(kV)

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Presentation transcript:

Dielectric strength(kV) Table 1. Standard Value Of Various Parameters Related To Power Transformer Properties U≤66kV 66<U≤22kV U>220kV Score Dielectric strength(kV) ≥40 ≥47 ≥50 100 35-40 42-47 45-50 80 30-35 40-45 60 <30 <35 <40 40 Acidity (mg(KOH/g)) ≤.05 ≤0.04 ≤0.03 0.05-0.1 0.1-0.15 0.03-0.07 0.1-0.2 0.07-0.1 ≥0.2 ≥0.15 ≥0.1 IFT(25®C) ≥25 ≥30 ≥35 20-25 23-30 25-35 15-20 19-23 <15 <19 <20 Tan δ <1.5 <1 <0.5 1.5-3 1-1.5 0.5-1 3-4 1-2 ≥4 ≥3 ≥2 Colour Light yellow Yellow Dark yellow Chocolate brown Leakage current 100µA Power factor 0.8 Sonali Mayuresh Akolkar et al. Remaining Life Assessment of Power Transformer. Journal of Automation and Control, 2014, Vol. 2, No. 2, 45-48. doi:10.12691/automation-2-2-2 © The Author(s) 2013. Published by Science and Education Publishing.