Answer / j.l. singh

1.Pressure relieve valve, 2. Oil surge relay,3. Buchltze
relay,4. Breather,5.Auto fire extinguishing(by sprikler)
for big transformers.
Different protection Systems also come under Safety devices.

Answer / maharaja

1.IR VALUE SHOULD BE MORE THAN 3MEGA OHMS FOR 1KV
2.PI VALUE SHOULD BE MORE THAN 1.4
3.TAN DELTA VALUE SHOULD BE LESS THAN .07%
4.ALL TRIPING AND INTER TRIPING SHOULD BE CHECKED.
5.AFTER CHARGING WE HAVE TO CHECK THE NOISE.
6.AFTER CHARGING WE HAVE TO CHECK THE WINDING AND OIL
TEMPERATURE 4 EACH ONE HOUR INTERVAL.

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