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Sampling Instructions For Transformer Oil Dissolved Gas Analysis (Dga)

The document provides instructions for sampling transformer oil using a syringe for dissolved gas analysis (DGA). Key steps include filling the syringe to 80% without bubbles, not pulling back on the barrel, bleeding the fluid through the stopcock, filling and evacuating the syringe three times, and recording sample temperature and details. Important reminders are to not wrap tape on the syringe or forget full sample descriptions.

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edciel
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75 views1 page

Sampling Instructions For Transformer Oil Dissolved Gas Analysis (Dga)

The document provides instructions for sampling transformer oil using a syringe for dissolved gas analysis (DGA). Key steps include filling the syringe to 80% without bubbles, not pulling back on the barrel, bleeding the fluid through the stopcock, filling and evacuating the syringe three times, and recording sample temperature and details. Important reminders are to not wrap tape on the syringe or forget full sample descriptions.

Uploaded by

edciel
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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SAMPLING INSTRUCTIONS FOR TRANSFORMER OIL

DISSOLVED GAS ANALYSIS (DGA)


Syringe Sampling
PDF Created with deskPDF PDF Writer - Trial :: http://www.docudesk.com

Some considerations before sampling:


Syringe should be filled to 80% full.
The handle of the plastic stopcock always points to the closed part.
DO NOT PULL BACK ON THE BARREL. This will result in bubble
formation. Allow the fluid pressure to push back the barrel and fill the
syringe. Apply a slight resistance to the barrel with your thumb.
Filled syringe should contain no air bubbles. However, samples will begin
releasing gases soon after sampling. Do not release any evolved gases
since these gases must be included in the DGA Analysis.
Adjust flow from sampling port for a
gentle flow of fluid through the tubing
and stopcock.
1 Bleed fluid through stopcock
Handle at Position 1.
2 Fill syringe
Handle at Position 2.
3 Evacuate fluid from syringe
Handle at Position 3.
4 Repeat steps 2 & 3 three times
5 Fill syringe to 80% full
Handle at Position 2.
Ensure no bubbles at this time.
6 Close syringe
Handle at Position 4.

You should now have a representative


sample from the insulating fluid within
the unit. Record the temperature and
any other pertinent information onto
the sample data sheet.

Important Reminders:
Do not wrap adhesive tape on the syringe
plunger, barrel or stopcock thinking it will
make the syringe more secure. The adhesive
has the tendency to leave gum on the
syringe plunger which is not only difficult to
remove but can also jam or break the
syringe.
Do not forget to put full description of the
samples such as Location, Serial Number,
Brand, and other pertinent details.
Do not forget to record full description of
the samples such as location, serial number,
make, type of oil and other pertinent
details.

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