remote control equipment - Indian Railways Institute of Electrical ...
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SI.<br />
No<br />
.<br />
APPLICATION AND INTERPRETATION OF TESTS ON<br />
TRANSFORMER OIL IN SERVICE<br />
(Ref.: IS : 1866)<br />
Tests Value as per<br />
IS: 1866<br />
Permissible limits<br />
54<br />
To be<br />
re-conditioned<br />
Annexure 3.03B<br />
To be replaced<br />
1 2 3 4 5<br />
1 Electric Strength<br />
(Breakdown<br />
voltage)<br />
Below 72.5 kV 30 kV<br />
72.5 kV and less<br />
than 145 kV<br />
Min Less than the<br />
value specified in<br />
Column 3<br />
40 kV<br />
145 kV.and above 50 kV<br />
2 Specific resistance<br />
(Resistivity)<br />
Ohm/cm at 27 °C<br />
above 10 x l0 12 Between<br />
1 x l0 12 to<br />
10 x 10 12<br />
3 Water content Greater than the<br />
value, specified in<br />
Column 3<br />
Below 145 kV Max 35 ppm<br />
Above 145 kV 25 ppm<br />
4 Dielectric<br />
dissipation factor,<br />
Tan delta at 90° C<br />
5 Neutralization<br />
value mg KOH/g<br />
<strong>of</strong> all<br />
6 Interfacial tension<br />
N/m at 27°C.<br />
Below 1 x 10 12<br />
0.01 or less Above 0.1 to 0.1 Above 0.01<br />
0.5 or less Above 0.5 Above 1.0<br />
0.02 or more 0.015 and above<br />
but below 0.02<br />
7 Rash point In °C 140 or more 125 and above<br />
but below 140<br />
Below 0.015<br />
Below 125<br />
8 Sludge Non-detectable Sediment Perceptible<br />
Sludge<br />
9 Dissolved Gas<br />
Analysis (DGA)<br />
Refer Annex.<br />
2.04
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