Dissolved
Gas Analyser
Transformer Oil Analysis using
Dissolved
Gas Analysis (DGA) is one of the most widely used diagnostic tool for
detecting and evaluating faults in the electrical equipment, highlight
B. Sitharaman, Dr. Vivek Dhole and A.Soundankar.
Introduction
Dissolved
Gas Analyser Introduction Dissolved Gas Analysis (DGA) is one of the
most widely used diagnostic tools for detecting and evaluating faults
in the electrical equipment. Some faults in the electrical transformers
can result in the production of gases, which remain dissolved in the
transformer fluid.
The trans- Dissolved Gas Analysis (DGA) is one of the most widely
used diagnostic tool for detecting and evaluating faults in the electrical
equipment, highlight B. Sitharaman, Dr. Vivek Dhole and A. Soundankar.
Transformer Oil Analysis using former oil and the insulating materials
get broken down into a few characteristic by-products when subjected
to possible fault conditions.
These typically indicative gases generated in the transformer gives
an insight to the type of the fault.
Thus, identification and quantification of these gases can provide
an early indication of developing problems in the electrical equipment
useful for a preventive maintenance program.
Analysis
Details
The
most widely used method for the detection of fault gases is the Dissolved
Gas Analysis (DGA) technique. In this method, a sample of the oil
is taken from the unit and the dissolved gases are extracted.
The extracted gases are then separated, identified, and quantitatively
determined.
At present, this entire techmethod it detects all the individual components.
The main advantage of the DGA technique is that it detects the gases
in the oil phase giving the earliest possible detection of the incipient
fault.
This advantage alone outweighs and disadvantages of this technique.
ASTM
methods D-3613, D-2945 and D-3612 describe in detail the sampling,
gas extraction and analytical procedures respectively.
IS-9434- 92 gives the guidelines for sampling and analysis of free
and dissolved gases.
A STM methods D-3613, D- 2945 and D-3612 describe in detail the sampling,
gas extraction and analytical procedures respectively. Equipment,
which is specially required for this purpose, is commercially market.
The extracted gases of interest in such an analysis are as follows:
nique is best done in the laboratory since it requires precision operations.
Since this method uses an oil sample it is applicable to all types
of units
and
like the gas blanket
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