Turbine oil and transformer oil standard testing parameters

 

TURBINE OIL STANDARD PARAMETERS

OIL: Servo prime 46T

Testing frequency: Every 6 months

Sl No.

Oil Property

UOM

Test Method

Acceptable limits

1

Appearance

NA

Visual

Clear/yellow Viscous liquid

2

Colour

Hazen

ASTM D1500

< 2

3

Density

Kg/m3

IS 1448-P-16:1990

820-870

4

Flash Point

0C

ATM D 93

> 180

5

Kinematic Viscosity at 40 0C

Cst

ATM D 445-17a

43-48

6

Kinematic Viscosity at 100 0C

Cst

ATM D 445-17a

>6.7

7

Viscosity index

NA

ASTM D 2270

> 98

8

PRPVOT (Revolving Presure Vessel Oxidation  Stabilty Test)

Minutes

ASTM D 2272

>25% (minimum)

9

Total acid number (TAN)

mg/KOH/g

ASTM D 974

<0.2

10

Elemental analysis (Metal like Fe,Cu,Cr,Al, Ni, Sn, Si etc wear analysis)

ppm

ASTM D 5185

< 20

11

Sediments

%

IS 1866:2000

<0.01

12

Moisture content

ppm

ASTM D 6304

<1000



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TRANSFORMER OIL STANDARD PARAMETERS

OIL: Transformer oil

Testing frequqency: 1 year

Sl No.

Oil Property

UOM

Test Method

Acceptable limits

1

Appearance

NA

Visual

Clear free from sediments & suspended matter

2

Density

Kg/m3

IS:1448(P:16)1990 (RA 2014)

890 max

3

Flash Point

0C

IS 1448(P:21)-2012/ATM D 93

>125

4

Pour point

0C

IS-1448 (P-10)

-6

5

Kinematic Viscosity at 27 0C

Cst

IS:1448(P:25)-1976 (RA 2007)

<27

6

Total acid number (TAN)

mg/KOH/g

S: 1448(P:2)-2007/ASTM D 974

<0.03

7

Sediments

%

IS 1866:2000

Should not be detective or <0.01

8

Moisture content

mg/kg

IS: 13567-1992 (RA 2008) /IEC-814/ASTM D 6304

<50

9

Breakdown voltage (Dielectric strength)

kv

IS: 6792-1992 (RA 2008)

40 kV

10

Tan Delta (Di–Electric Dissipation Factor) in absolute, at a Temp:900C

Degree

IS: 6262-1971 (RA 2011) 

<1

11

Resistivity (Specific Resistance) at 90 deg C

Ω-cm

IS: 6103-1971 (RA 2011) 


>35 X1012

12

Dissolved gas analysis

 

IS: 10593:2006
 &
9434-1992 
(RA 2008) or IEC 567

 

a

Methane (CH4)

ml/l

100-150 (oil life 4 to 10 years)

b

Ethylene (C2H4)

ml/l

15-200 (oil life 4 to 10 years)

c

Ethane (C2H6)

ml/l

100-150(oil life 4 to 10 years)

d

Acetylene(C2H2)

ml/l

30-50(oil life 4 to 10 years)

e

Carbon Monoxide(Co)

ml/l

400-500(oil life 4 to 10 years)

f

Carbon Dioxide (Co2)

ml/l

4000-5000(oil life 4 to 10 years)

g

Hydrogen (H2)

ml/l

200-300(oil life 4 to 10 years)

13

Interfacial Tension (IFT)

N/m

IS: 6104-1971 Ring Method (RA 2011)/ASTM D 971 

> 0.015


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