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Tr Oil Charecteristics

Charecteristics of New Transformer Insulation Oil

 

         

Characteristics   Requirement  
1   Appearance     The oil shall be clear and free from suspended matter or sediments  
2   Density at 29.5 deg C     Max : 0.89gm/cu.cm  
3   Kinematic viscosity at 27 deg C     Max : 27 centi-strokes  
4   Interfacial Tension at 27deg C     Min : 0.04N/m  
5   Flash Point - Pensky Marten (closed)     Min : 140degC  
6   Pour Point     Max : 6degC  
7   Neutralisation Value a)Total acidity       b)Inorganic acidity/alkalinity     Max  :  0.03mgKOH/gmof oil    /  NIL  
8   Corrosive Sulphur     Non-corrosive  
9   Electric Strength(B/D Voltage)       a) New unfiltered oil.           b)  After Filtration  

   Min: 30KV(rms)    

   Min:60KV (rms)

 
10   Dielectric Dissipation Factor(tan "delta") at 90 deg C      Max : 0.002  
11   Specific Resistance(Resistivity) a)at 90degC  b)at 27deg C  

   Min:35 x 10Exp(12)ohm-cm     

   Min:1500 x 10Exp (12) ohm-cm

 
12   Oxidation Stability     a)Neutralisation Value after oxidation    b) Total sludge after oxidation  

   Max :0.4mgKOH/gm of oil          

   Max :0.1% by weight         

 
13   Water content      Max:50ppm  

 

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