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 oil pipe material.
3. Measure the distance from the oil valves to the DGA monitor, and plan the length and
shape of the oil pipe sections. Minimize the amount of joints.
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. Cut and bend the oil pipe to appropriate sections for building the oil lines.
5. Remove any sharp edges from the cut surfaces.
6. Clean any metal shavings from inside the pipes using pressurized air.
7. Build the oil lines between the valves and the oil connections on the DGA monitor marked
Oil In and Oil Out.
8. Remove the plugs from the pipe fittings on the DGA monitor and store them for possible
later use. Check that the fittings are clean.
Chapter 3 – Mechanical installation
33
To Next Page
Loading...