If the DGA monitor is mounted using the wall mounting set, the power supply unit
will be attached by a mounting cradle. Make sure you are not routing the oil lines
so that they will obstruct the power supply unit attachment.
Before starting to install the oil lines, see oil connection location recommendations for
important information.
Minimum bending radius from center line for the flexible hoses is 3.05 cm (1.20
inches).
Do not bend flexible hoses close to the fitting connection to avoid strain.
1. Inspect and prepare the selected inlet and outlet oil valves on the transformer:
a. Remove any previously installed flow direction control valves. The DGA monitor
needs to pump oil in both directions during initialization, and will not work if there are
flow direction controllers in the oil lines.
b. Clean any loose dirt from the outside and inside of the oil valves on the transformer.
c. Drain some oil from the selected valves into the waste oil container. Verify that the oil
is clean and there is no sludge coming out with the oil. If there is sludge, do not use
that valve to connect the DGA monitor.
2. Install the adapters to the inlet and outlet valves on the transformer to match them to the
size of the flexible hose connectors.
3. Measure the distance from the oil valves to the DGA monitor, and plan the shape of the oil
line installation.
a. Use pipe supports every 1 meters (3 feet).
b. Do not coil excess flexible hoses. Loop the hoses away from the DGA monitor along
the cable guides or other protection structures. Mind the minimum bending radius.
c. Make sure the flexible tubing is parallel to the ground to avoid air traps during
bleeding.
d. Make sure the flexible hoses are not under constant strain after installation.
Make sure that both oil connections on the transformer are
below oil level. There must be no risk of drawing gas into the oil lines even
when the flow is reversed.
CAUTION!
4. Build the oil lines between the valves and the oil connections on the DGA monitor marked
Oil In and Oil Out.
OPT100 Installation Guide M211857EN-R
36
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