3.4 Installing oil lines
• Adapters for connecting the oil pipes to the valves on the transformer
• Adapters for connecting the oil pipes to the DGA monitor, if not using the
recommended tubing size (10‑mm (0.39‑in) outer diameter). Optional
accessories for connecting 3/8" and 1/4" outer diameter tubing are available
from Vaisala.
• Recommended oil pipe material: stainless steel tubing with 10‑mm (0.39‑in)
outer diameter and 1 … 1.5‑mm (0.039 … 0.059 in) wall thickness. Enough to
connect the oil intake and return valves to the DGA monitor.
• Pipe fittings for joining pipe sections
• Pipe supports
• Pipe bending tool
• Pipe cutting tool
• Pipe deburring tool
• Pressurized air, either a bottle or a compressor
• Wrenches of various sizes
• Container for waste oil with at least 5 liter (1.3 gallon) capacity
When working with oil pipes, hoses, fittings, and adapters:
• Keep parts and tools clean and o the ground. Dirty parts may contaminate
the transformer oil or cause connections to leak.
• Oil pipes, hoses and connection adapters must be dry, without any free
water residue inside. Water inside the oil lines can cause issues with the
OPT100 measurement and water may be carried with the oil to the connected
transformer.
• Use new Swagelokâ adapters (nuts and ferrules) when making new
connections. Do not use third party adapters or used parts from a dierent
connection. Opening and retightening existing oil line connections without
changing the nuts and ferrules is OK as long as the parts appear intact and
you can verify the connections do not leak. Swagelok part code for the
included 10-mm pipe adapters is SS-10M0-NFSET.
• If you are unsure about the proper use of fittings and adapters, refer to their
manufacturer's instructions online.
CAUTION!
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.
Wear protective eyewear and gloves.
Before starting to install the oil lines, see oil connection location recommendations for
important information.
OPT100 Installation Guide M211857EN-R
32
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