Technical Specification of Transformer OIl

S..No. CHARACTERISTIC UNIT AS PER IS 335:93 AS PER BS 148 AS PER IEC 296/60296
1. Appearance Clear & Transparent free from sediments Clear & Transparent free from sediments Matter Clear & Transparent and free from suspended matter and sediments
2. Density at 29.5°C (Max.) at 20.0°C

g/cm3

g/ml

0.89 0.895 0.895
3. Viscocity 27 °C,40°C, -30°C

Cst,Mm2 /s

 

27 (max.)under consideration 16.5 max.,1800 12 max.1800
4. Interfacial Tension N/m 0.04 min.
5 Flash Point PMCC min. °C 140 130 135
6 Pour Point °C -6 <-30 <-40
7 Acidity Mg/Koh/g 0.03 0.03 0.01
8 Corrosive Sulphur Non corrosive Non corrosive Non corrosive
9 Break Down VoltageAfter filtrations Rms

30

60

30

50

30

50

10 Oxidation Stability:- Total AciditySludge KoH/g.%by wgt.

0.4

0.1

1.5

1.0

1.2

0.8

11 Dielectric Dissipation Factor 90°C 0.002 0.005 0.005
12

Specific Resistance

At 90°C

At 27°C

 

ohm-cm

35X1012

1500X101

13 Aging Characteristic,Resistivity 90°C 27°C,DDF @90°C

Min.

Min.

Max

2.5X1012

1500X1012

0.20

14 Presence of oxidation inhibitor Oil shall not contain anti oxidation inhibitor Not detectable Not detectable
15 PCA Contents Max 3%
16 PCB Contents Not detectable
17 Furfural Contents Max.mg.kg 0.1
18 Water Contents Max.,ppm 50 30