Scion Instruments
Scion Instruments Transformer Gas Analyzer Reference Manual Page: 3
INTRODUCTION
Certain faults in electrical transformers may result in the production of
gases, which remain dissolved in the transformer fluid. The transformer fluid
and insulating materials will break down into a few easily identifiable by-
products when subjected to fault conditions.
Identification and quantification of these gases can provide an early
indication of developing problems in the equipment.
ASTM methods D3613, D2945 and D3612 describe sampling, gas extraction
and analysis procedures respectively.
The components of interest in the extracted gas are typically hydrogen,
oxygen, nitrogen, carbon monoxide, carbon dioxide, methane, ethane,
ethylene and acetylene.
The Transformer Gas Analyzer Channel is an analytical tool principally
developed for the determination of these components.
The sample is simultaneously injected into two individual channels by
means of a
10 port gas sampling valve equipped with two sample loops. A molecular
sieve column separates the lighter gases like hydrogen, oxygen, nitrogen,
methane and carbon monoxide while a porous polymer column separates
the other carbon gases. A methanizer-FID combination ensures that the
carbon oxide gases are detected at low ppm levels.
For a real understanding of the flow scheme, see also the states of
operation in section 3 of this manual.
The instrument is tuned during Final Test to its proper settings. Do
not change any flow or pressure settings unless it is requested.
