Recommended Locations Of Oil Connections; Figure Possible Locations Of Oil Connections - Vaisala Optimus OPT100 Installation Manual

2.8.2 Recommended Locations of Oil Connections
You must build two oil lines between the DGA monitor and the transformer: one for intake of
fresh oil, and a return line for the measured oil. Make sure you have appropriate adapters for
connecting the oil lines to the valves. The maximum allowed length of an oil line is 10 m (33 ft).
Location of oil connections on the transformer may affect measurement performance.
2
3
4
5
Figure 1 Possible Locations of Oil Connections
1 Oil reservoir. Not recommended.
2 Side of the oil tank, top level. Good for returning the measured oil.
3 Side of the oil tank, high enough from the bottom to enable proper oil movement. Good
for oil intake. Moisture response time is moderate depending on the oil volume.
4 Straight section in the radiator's outlet pipe. Good location for intake and return if the pipe
has guaranteed oil flow.
Oil flow guarantees that the sampled oil is representative and carries the returned oil away
from the inlet. Compared to the radiator inlet pipe, oil in the outlet pipe is cooler,
preventing unnecessary heating of the DGA monitor.
5 Drain valve of the oil tank. To achieve representative measurement results, use only on
transformers that have pump-assisted oil circulation. Confirm there is no oil sludge or free
water in the bottom of the tank.
CAUTION!
water present.
1
Make sure the valve you are connecting to has no oil sludge or free
Chapter 2 – Planning The Installation
13